QUESTIONS FOR NEET MODEL-PHYSICS

EXAM IS CONDUCTED BY THE CENTRAL BOARD OF SECONDARY EDUCATION WHO USED TO CONDUCT AIPMT EXAMS SO MODEL OF EXAM WILL BE MORE OR LESS SIMILAR TO AIPMT PRELIMS EXAMS..
WE SHARE HERE SAMPLE QUESTIONS IN PHYSICS

1.

A ball rests upon a flat piece of paper on a table top. The paper is pulled horizontally but quickly towards right as shown. Relative to its initial position with respect to the table, the ball _____.

  

(a) remains stationary if there is no friction between the paper and the ball.

(b) moves to the left and starts rolling backwards, i.e. to the left if there is a friction between the paper and the ball.

(c) moves forward, i.e. in the direction in which the paper is pulled.

Here, the correct statement/s is/are _____ .

(A) only (a)

(B) only (b)

(C) both (a) and (b) physics questions

(D) only (c)

Answer: (C)

2.

A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the bal at a position X are represented by _____.

Answer: (A)

3.

A convex lens is made of 3 layers of glass of 3 different materials as in the figure. A point object is placed on its axis. The number of images of the object are

(A) 1

(B) 2

(C) 3

(D) 4

Answer: (A)

4.

A current I is flowing through the loop. The direction of the current and the shape of the loop are as shown in the figure. The magnetic field at the centre of the loop is  times______. (MA=R, MB=2R, ëDMA:90°)

 (A) , but out of the plane of the paper.

(B) , but into the plane of the paper.

(C) , but out of the plane of the paper.

(D) , but 1nto the plane of the paper.

Answer: (B)

5.

A point object O is kept at a distance of OP = u. The radius of curvature of the spherical surface APB is CP = R. The refractive indexes of the media are n₁ and n₂ which are as shown in the diagram. Then,

a) if n₁ > n₂, image is virtual for all values of 'u'.

b) if n₂ = 2n₁, image is virtual when R > u.

c) the image is real for all values of u, n₁ and n₂.

Here, the correct statement/s is/are ______.

(A) only a)

(B) a), b) and c)

(C) only b)

(D) both a) and b)

Answer: (D)

6.

A, B and C are the parallel sided transparent media of refractive index n₁, n₂ and n₃ respectively. They are arranged as shown in the figure. A ray is incident at an angle q on the surface of separation of A and B which is as shown in the figure. After the refraction into the medium B, the ray grazes the surface of separation of the media B and C. Then, Sin q = ______.

(A) 

(B) 

(C) 

(D) 

Answer: (C)

7.

All capacitors used in the diagram are identical and each is of capacitance C. Then the effective capacitance between the points A and B is ______.

(A) C

(B) 3 C

(C) 1.5C

(D) 6 C

Answer: (C)

8.

An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is s. Electric intensity in the space between the plates is E. A uniform magnetic field B also exists in that space perpendicular to the direction of E.

The electron moves perpendicular to both and without any change in direction.

The time taken by the electron to travel a distance l in that space is ______.

(A) 

(B) 

(C) 

(D) 

Answer: (A)

9.

An ideal gas is taken via path ABCA as shown in figure. The network done in the whole cycle is

(A) 3P₁ V₁

(B) -3 P₁ V₁

(C) 6 P₁ V₁

(D) zero

Answer: (B)

10.

Assume the graph of specific binding energy versus mass number is as shown in the figure. Using this graph, select the correct choice from the following :

(A) Fusion of two nuclei of mass number lying in the range of 1 <A < 50 will release energy.

(B) Fission of the nucleus of mass number lying in the range of 100 < A < 200 will release energy when broken into two fragments.

(C) Fusion of two nuclei of mass number lying in the range of 100 < A < 200 will release energy.

(D) Fusion of two nuclei of mass number lying in the range of 51 < A < 100 will release energy.

Answer: (D)

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1. A child pulls a toy car weighing 0.20 kg across a smooth floor by means of a string attached to it. If the string makes an angle of 60° to the floor and the child pulls with a force of 2.0 N, then the amount of work he does in pulling the car a distance of 5.0 m is...
   
   
   
   1. 5.0 J
   2. 10.0 J
   3. 12.7 J
   4. 17.3 j
2. The note middle C played on a piano always differs from middle C played on a violin because of a difference in...
   
   
   
   1. frequency
   2. wavelength
   3. fundamentals
   4. harmonics
3. chromatic aberration of a lens is caused by...
   
   
   
   1. diffraction
   2. diffusion
   3. dispersion
   4. interference
4. The molar gas constant is the same for all gases because, at the same pressure and temperature, equal volumes of gases have the same...
   
   
   
   1. number of molecules
   2. average kinetic energy
   3. density
   4. mass
5. A Hall probe is used to determine...
   
   
   
   1. the magnetic moment of a coil
   2. the susceptibility of a material
   3. relative permittivity
   4. magnetic flux density
6. In a nuclear fission reactor, graphite is often used for...
   
   
   
   1. absorbing neutrons and controlling the reaction
   2. slowing down neutrons
   3. preventing the radiation from escaping into atmosphere
   4. all the above
7. In a Newton's rings experiment, the thickness of the air space between the lens and the glass plate is 1.8 x 10^-6 m for the sixth dark ring. The wavelength of the light used is...
   
   
   
   1. 1.7 x 10^-8 m
   2. 3.0 x 10^-7 m
   3. 6.0 x 10^-7 m
   4. 6.0 x 10^-5 m
8. If α denotes the current gain of a transistor in the common-base mode of operation and β denotes the current gain in the common-emitter mode, then α and β are related by...
   
   
   
   1. α = β/(1 + β)
   2. α = (1 + β)/β
   3. α = (1 - β)/β
   4. β = (1 + α)/α
9. A certain metal has a work function of 2 eV. Taking Planck's constant h = 6.6 x 10²⁴ J.s, charge on electron e = 1.6 x 10^-19 C and velocity of light C = 3 x 10⁸ m/s, what is its approximate threshold frequency?
   
   
   
   1. 5 x 10¹³ Hz
   2. 5 x 10¹⁴ Hz
   3. 5 x 10¹⁵ Hz
   4. 2 x 10¹⁵ Hz
10. A monoatomic gas is allowed to expand adiabatically until its volume is eight times greater. Compared to the original pressure, the new pressure must be smaller by a factor of...
    
    
    
    1. 4
    2. 8
    3. 16
    4. 32
11. During a negative β-decay...
    
    
    
    1. an atomic electron is ejected
    2. an electron which is already present within the nucleus is ejected
    3. a neutron in the nucleus decays emitting an electron
    4. a part of the binding energy of the nucleus is converted into an electron
12. A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved farther apart by means of insulating handles...
    
    
    
    1. the charge on the capacitor increases
    2. the voltage across the plates increases
    3. the capacitance increases
    4. the electrostatic energy stored in the capacitor increases
13. Two bodies M and N of equal masses are suspended from two separate massless springs of spring constants K₁ and K₂, respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, then the ratio of the amplitude of vibration of M to that of N is...
    
    
    
    1. K₁/K₂
    2. √(K₁/K₂)
    3. K₂/K₁
    4. √(K₂/K₁)
14. Two coherent monochromatic light beams of intensities I and 4I are superimposed. The maximum and minimum intensities in the resulting beam are...
    
    
    
    1. 5I, I
    2. 5I, 3I
    3. 9I, I
    4. 9I, 3I
15. A vessel contains oil (density = 0.8 g/cm³) over mercury (density = 13.6 g/cm³). A homogeneous sphere floats with half its volume immersed in mercury and other half in oil.The density of the material of the sphere in g/cm³ is...
    
    
    
    1. 3.3
    2. 6.4
    3. 7.2
    4. 12.8
16. An organ pipe P¹ closed at one end vibrating in its first harmonic and another pipe P² open at both ends vibrating in its third harmonic are in resonance with a given tuning fork. The ratio of the length of P¹ to that of P² is...
    
    
    
    1. 8 : 3
    2. 3 : 8
    3. 1 : 2
    4. 1 : 3
17. Two particles x and y have equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R₁ and R₂, respectively. The ratio of the mass of x to that of y is...
    
    
    
    1. (R₁/R₂)^1/2
    2. R₂/R₁
    3. (R₁/R₂)²
    4. R₁/R₂
18. A feably prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is...
    
    
    
    1. 6 h
    2. 12 h
    3. 24 h
    4. 128 h
19. A nuclear bomb explodes 200 km above the surface of moon. The sound of explosion on the moon will...
    
    
    
    1. be heard before the flash of explosion is seen
    2. be heard at the same time explosion occurs
    3. be heard after the explosion
    4. not be heard at all
20. A blue colour star is...
    
    
    
    1. hotter than white star
    2. cooler than white star
    3. at the same temperature as white star
    4. at 0 K temperature
21. The position of a particle at time t is √ x = 10 + t, then...
    
    
    
    1. velocity is constant
    2. velocity α t
    3. acceleration α t
    4. acceleration is zero
22. The maximum height and range of a projectile are equal when the angle of projection is...
    
    
    
    1. 45
    2. 60
    3. tan^-1 (1/4)
    4. tan^-1 4
23. A force of 140 N acts on a body of mass 100 kg. If the frictional force is 40 N, then the acceleration of the body is ______ m/s²
    
    
    
    1. 1
    2. 180
    3. 18
    4. 1.8
24. The work done by centripetal force(F) on a particle of mass m moving round a circle of radius r with a uniform sped of v is
    
    
    
    1. F x r
    2. F x 2πr
    3. zero
    4. F x v
25. When a sphere rolls without slipping the ratio of translational kinetic energy to total kinetic energy is...
    
    
    
    1. 3 : 7
    2. 1 : 1
    3. 7 : 5
    4. 5 : 7
26. When a satellite revolves round the earth in an orbit very close to earth its orbital velocity is...
    
    
    
    1. 11.2 m/s
    2. 11.2 km/s
    3. 8 m/s
    4. 8 km/s
27. The diameter of a water molecule is _____ A°.
    
    
    
    1. 1.5
    2. 2
    3. 1
    4. 3
28. To produce longitudinal extension we should exert force in...
    
    
    
    1. one direction only
    2. two directions
    3. perpendicular to the body in all directions
    4. parallel to the body
29. A metal sphere has a spherical cavity in it. When the ball is heated the volume of cavity will...
    
    
    
    1. increase
    2. decrease
    3. not change
    4. depend on mass of sphere
30. A weightless spring of force constant 5 N/m is cut into two equal halves and the two are connected in parallel. The equivalent force constant of the system in N/m is...
    
    
    
    1. 5
    2. 10
    3. 15
    4. 20

1. For an object performing SHM the magnitude of maximum velocity is given by...
   
   
   
   1. ω √(A² - y²)
   2. ω √(y² - A²)
   3. ωA
   4. ω²A
2. The reciprocal of wavelength is called...
   
   
   
   1. frequency
   2. wave velocity
   3. amplitude
   4. wave number
3. ______ is for rotational motion as mass is for linear motion.
   
   
   
   1. mass
   2. torque
   3. moment of inertia
   4. inertia
4. If m is the mass of a planet, r is radius of its orbit, ω is the angular velocity and v is its linear velocity, then the force acting on planet is...
   
   
   
   1. mrv²
   2. mr²V²
   3. mrω²
   4. mr²ω²
5. In a fuel cell the conversion of chemical energy into electrical energy takes place...
   
   
   
   1. at both electrodes
   2. at the anode only
   3. at the cathode only
   4. in the electrolyte
6. Which of the following is not the unit of magnetic flux?
   
   
   
   1. weber
   2. tesla-m²
   3. m²kgs^-1
   4. henry
7. Impulse is equal to...
   
   
   
   1. momentum
   2. change in momentum
   3. change in momentum per unit time
   4. change in momentum per unit mass
8. 1 kWh is equal to...
   
   
   
   1. 746 W
   2. 3.6 x 10⁶ J
   3. 3.6 hp
   4. 746 kW
9. The atomic mass of copper is 64 and its density is 9.0 g/cm³. The volume of one mole of atoms of copper is _____ g/cm³.
   
   
   
   1. 6.023 x 10²³
   2. (6.023 x 9 x 10²³)/64
   3. (6.023 x 64 x 10²³)/9
   4. 64/9
10. Young's modulus for aluminium is 7 x 10¹⁰ Pa. The force needed to stretch, an aluminium wire with 2 mm diameter and 800 mm length, by 1 mm is...
    
    
    
    1. 2.75 N
    2. 275 N
    3. 1.10 N
    4. 275 kN
11. The MKS unit of coefficient of viscosity is...
    
    
    
    1. poise
    2. centipoise
    3. Pa second^-1
    4. Pa second
12. Electric charge is quantized. This means that the electric charge...
    
    
    
    1. is not continuous
    2. is continuous
    3. is constant
    4. has mass
13. A 2 kg ball moves with a speed of 8 m/s and collides with a 4 kg ball moving in the same direction with a speed of 2 m/s. After the collision, the heavier ball has a speed of 5 m/s. The collision results in a decrease in the total kinetic energy of translation of two balls of...
    
    
    
    1. 0 J
    2. 6 J
    3. 12 J
    4. 18 j
14. The result of combining two mutually perpendicular vibrations was first extensively studied by...
    
    
    
    1. Huygens
    2. Lissajon
    3. Sabine
    4. Newton
15. On a sunny day you may see very bright lines formed on the bottom of a swimming pool. The prime cause of these is...
    
    
    
    1. absorption
    2. diffraction
    3. interference
    4. refraction
16. A piece of glass which has been heated to a high temperature is left to cool. If the glass cracks, it will most likely be because of...
    
    
    
    1. low thermal conductivity of glass
    2. high thermal conductivity of glass
    3. low specific heat capacity of glass
    4. high specific heat capacity of glass
17. The charge to mass ratio of an electron is about 1.8 x 10¹¹ C kg^-1. In a certain television tube, where the accelerating voltage is 1600V, the electrons have a speed just before striking the screen of approximately...
    
    
    
    1. 16000 kms^-1
    2. 20000 kms^-1
    3. 24000 kms^-1
    4. 28000 kms^-1
18. A mass spectrometer may be used to distinguish between...
    
    
    
    1. different elements
    2. different isotopes
    3. identical isotopes bearing different charge
    4. all of the above
19. If a train is to move with velocity of light, its length would be
    
    
    
    1. infinite
    2. unchanged
    3. zero
    4. half the original
20. A radio-station broadcasts at 30 m band. The frequency of electromagnetic waves transmitted from this station could be...
    
    
    
    1. 10 MHz
    2. 10 kHz
    3. 3 x 10¹⁰ Hz
    4. 11 x 10¹¹ Hz
21. The energy generation in stars is due to...
    
    
    
    1. fusion of heavy nuclei
    2. fusion of light nuclei
    3. chemical reaction
    4. fission of heavy nuclei
22. Two resistances are joined in parallel whose resultant is 6/5 ohm. One of the resistance wires is broken and the effective resistance becomes 2 ohm. The resistance in ohm of the wire that got broken is...
    
    
    
    1. 2
    2. 3
    3. 3/5
    4. 6/5
23. When the distance between a source and a cliff is 'd', the time taken to hear the first echo of sound with velocity 'V' is...
    
    
    
    1. V.d
    2. 2V/d
    3. 2d/V
    4. d/V
24. Which of the following pairs of physical quantities have the same unit?
    
    
    
    1. Force and power
    2. Stress and strain
    3. Young's modulus and pressure
    4. Coefficient of viscosity and surface tension
25. The area enclosed by the displacement-time graph of a body thrown in air gives...
    
    
    
    1. average speed
    2. average velocity
    3. acceleration
    4. no significant physical quantity
26. A particle is moving eastwards with a velocity of 5 m/s. In 10 seconds the velocity changes to 5 m/s northwards. The average acceleration in this time is...
    
    
    
    1. zero
    2. (1/√ 2) m/s² towards northwest
    3. (1/√ 2) m/s² towards northeast
    4. (1/2) m/s² towards northwest
27. Swimming becomes possible because of _____ law of motion.
    
    
    
    1. First
    2. Second
    3. Third
    4. none of the three
28. A thin film of liquid is enclosed between two glass plates. It is difficult to separate the plates on account of...
    
    
    
    1. Viscosity
    2. Surface tension
    3. Friction
    4. Atmospheric pressure
29. The highest temperature that can be recorded by a mercury thermometer is...
    
    
    
    1. 100°C
    2. 157°C
    3. 257°C
    4. 357°C
30. A tuning fork originally in unison with another fork of frequency 260 Hz, produces 4 beats per second, when a little wax is attached to it. What is the frequency now?
    
    
    
    1. 260 Hz
    2. 264 Hz
    3. 256 Hz
    4. 262 Hz

1. A toy for firing a ball vertically consists of a spring which is compressed 0.10 m by an average force of 5.0 N. If a ball of mass 0.05 kg is placed on the spring and the spring released, the ball will reach a height of ...
   
   
   
   1. 1.0 m
   2. 1.2 m
   3. 1.4 m
   4. 1.6 m
2. A horizontal rope is fixed at one end. The other end is held in the hand and a wave motion is generated by moving the hand up and down repeatedly. A stationary wave is formed and it is observed that a small piece of ribbon tied to the rope is about half way between a node and an adjacent antinode. The movement of the ribbon is...
   
   
   
   1. up and down
   2. back and forth
   3. a combination of A & B
   4. impossible to determine
3. In an astronomical telescope, the objective lens forms an image that is...
   
   
   
   1. real and erect
   2. real and inverted
   3. virtual and erect
   4. virtual and inverted
4. The specific latent heat of vaporisation of water is 2.3 x 10⁶ J/kg. The percentage of this energy that is necessary to overcome atmospheric pressure is...
   
   
   
   1. 0
   2. between 0 and 50%
   3. 50%
   4. between 50 and 100%
5. The electron-volt is a measure of...
   
   
   
   1. charge
   2. current
   3. potential
   4. energy
6. In which of the following units could Planck's constant be expressed?
   
   
   
   1. joule
   2. joule-hertz
   3. joule-second
   4. newton-second
7. The capacitance of a parallel plate capacitor would be decreased by...
   
   
   
   1. increasing the separation of the plates
   2. increasing the area of overlap of the plates
   3. replacing the air between the plates by paper
   4. replacing the air between the plates by mica
8. Two light sources have exactly the same frequency and are always exactly out of step with each other. This is an example of...
   
   
   
   1. phase reversal
   2. Huygen's principle
   3. coherence
   4. destructive interference
9. Two bodies of mass m₁ and m₂ are moving with equal kinetic energy.The ratio of their linear momentum P₁ : P₂ is...
   
   
   
   1. m₁ : m₂
   2. m₂ : m₁
   3. m₁² : m₂²
   4. √m₁ : √m₂
10. The force required to make the length of a wire three times its original length is ____ when the area of cross-section is unity and Y is the Young's modulus.
    
    
    
    1. 2Y
    2. 3Y
    3. Y
    4. Y/2
11. The first law of thermodynamics is a special case of...
    
    
    
    1. law of conservation of momentum
    2. law of conservation of energy
    3. Boyle's law
    4. Charles' law
12. If the velocity of sound in air at 0°C is 300 m/s, at what temperature will the velocity be 400 m/s?
    
    
    
    1. 330°C
    2. 485°C
    3. 674°C
    4. 1000°C
13. A ray of light incident on a 60° angled prism of refractive index √ 2, suffers minimum deviation. The angle of incidence is...
    
    
    
    1. 75°
    2. 0°
    3. 45°
    4. 60°
14. Two equal negative charges(-q) are fixed at two points (0,a) and (0,-a) on the Y-axis. A positive charge q is released from rest at the point (2a,0) on the X-axis. The charge q will...
    
    
    
    1. execute SHM about the origin
    2. move to the origin and remain at rest
    3. move to infinity
    4. execute oscillatory motion but not SHM.
15. Ball-point pen functions on the principle of
    
    
    
    1. viscosity
    2. Boyle's law
    3. gravitational force
    4. surface tension
16. A soap bubble has a radius of 3 cm. The surface tension of soap solution is 1.5 x 10^-2 N/m. The excess of pressure (in N/m²) is equal to...
    
    
    
    1. 1
    2. 2
    3. 0.5 x 10^-2
    4. 1.0 x 10^-2
17. In case of a prism, the angle of deviation is greater for...
    
    
    
    1. violet
    2. red
    3. blue
    4. green
18. A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance of...
    
    
    
    1. each of them increases
    2. each of them decreases
    3. copper increases and germanium decreases
    4. copper decreases and germanium increases
19. Which of the following is always attractive?
    
    
    
    1. Strong force
    2. Electrostatic force
    3. Magnetic force
    4. None of the three
20. A non-conservative force does not give rise to...
    
    
    
    1. thermal energy
    2. kinetic energy
    3. light energy
    4. potential energy
21. If E_A is the energy required for the equilibrium separation of two hydrogen atoms in a molecule of hydrogen and E_M is the energy required for the equilibrium separation of two molecules of hydrogen, then...
    
    
    
    1. E_A = E_M
    2. E_A = E_M/(√ 2)
    3. E_A > E_M
    4. E_A < E_M
22. When pressure of 2.0 MPa is applied to a sample of kerosene, it contracts by 15%. The bulk modulus of kerosene is...
    
    
    
    1. 1.7 MPa
    2. 1.997 MPa
    3. 2.003 MPa
    4. 1.3 GPa
23. A wetting agent...
    
    
    
    1. reduces angle of contact
    2. increases angle of contact
    3. increases surface tension
    4. increases surface area
24. When a slab of insulating material is introduced in a capacitor, its capacitance
    
    
    
    1. becomes zero
    2. decreases considerably
    3. increases considerably
    4. does not change
25. For a constant-length pendulum, the periodic time depends on
    
    
    
    1. amplitude
    2. length
    3. mass of pendulum
    4. 'g'
26. The amplitude of a sound wave determines its...
    
    
    
    1. pitch
    2. loudness
    3. overtones
    4. resonance
27. The value of 'g' at pole is...
    
    
    
    1. greater than that at the equator
    2. smaller than that at the equator
    3. equal to that at the equator
    4. zero
28. Which of the following engines is the most efficient?
    
    
    
    1. gasoline
    2. diesel
    3. gas turbine
    4. Carnot
29. A 50-V battery is connected across a 10-ohm resistor and a current of 4.5 A flows. The internal resistance of the battery is...
    
    
    
    1. 0
    2. 0.5 ohm
    3. 1.1 ohm
    4. 5 ohm
30. In an LCR series circuit Q-factor is given by...
    
    
    
    1. 1/√LC
    2. √(L/C)
    3. (1/R).√(L/C)
    4. R/(√LC)

1. The error in measuring the radius of a sphere is 2%. Then the error in the measurement of its volume is...
   
   
   
   1. 8%
   2. 6%
   3. 2%
   4. 9%
2. A magician is throwing rings into air in such a way that when a ring is at its maximum height he throws another ring. If the time difference between each throw is 1 sec then the height attained by the ring is...
   
   
   
   1. 49 m
   2. 49 cm
   3. 9.8 m
   4. 4.9 m
3. If the mass and force are doubled then the acceleration will...
   
   
   
   1. double
   2. become thrice
   3. become four times
   4. remain same as before
4. A string is tied to the neck of a bottle containing soda water and then whirled in a vertical circle. The bubbles will be found...
   
   
   
   1. near the neck
   2. at the bottom
   3. at the centre
   4. everywhere in the bottle
5. If the absolute temperature of a gas is doubled, then V_rms will become
   
   
   
   1. 2 times
   2. √ 2 times
   3. 1/2 times
   4. 4 times
6. When the temperature of a black body is lowered to half its original value then the amount of heat radiated will be reduced to...
   
   
   
   1. 1/2
   2. 1/4
   3. 1/8
   4. 1/16
7. A shell is fired from a cannon with a velocity V at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon then the speed of the other immediately after the explosion is...
   
   
   
   1. 3Vcosθ
   2. 2Vcosθ
   3. 3/2
   4. (√ 3)Vcosθ/2 
8. X-rays have energy of the order of...
   
   
   
   1. 10 eV
   2. 10⁶ eV
   3. infinity
   4. zero
9. In Rutherford model of the atom, the path of an electron will be...
   
   
   
   1. a straight line
   2. parabolic
   3. circular
   4. spiral
10. A double concave lens of glass, placed in a liquid of refractive index 2, will behave as...
    
    
    
    1. diverging lens
    2. concave mirror
    3. converging lens
    4. none of the above
11. Megawattday is the unit of...
    
    
    
    1. power
    2. force
    3. energy
    4. density
12. A particle executes SHM with its frequency f. The frequency with which its kinetic energy oscillates is...
    
    
    
    1. f/2
    2. f
    3. 2f
    4. 4f
13. If the acceleration due to gravity,g, is about 10 m/s² near the surface of the earth, then at the centre of the earth g would have an approximate value of...
    
    
    
    1. zero
    2. 5 m/s²
    3. 10 m/s²
    4. 20 m/s²
14. A tuning fork vibrates at a frequency of f Hz. It is viewed through a stroboscopic disc having four equally spaced slots in it. In order for the vibrating tuning fork to appear stationary, the minimum number of revolutions per second at which the disc should be rotated is...
    
    
    
    1. f/8
    2. f/4
    3. f/2
    4. f
15. Which of the following materials has the greatest relative permittivity?
    
    
    
    1. Air
    2. Glass
    3. Mica
    4. Water
16. The distance between two consecutive antinodes is...
    
    
    
    1. λ
    2. λ/2
    3. λ/3
    4. λ/4
17. For an object below the earth's surface, if the distance of the object from earth's centre is 'd', then the acceleration due to gravity is proportional to...
    
    
    
    1. d
    2. d²
    3. 1/d
    4. 1/d²
18. A type of process that does not need outside energy to reverse is one that occurs at constant...
    
    
    
    1. temperature
    2. pressure
    3. volume
    4. speed
19. Which of the following combinations of length(l) and cross-sectional area(A) will give a certain volume of copper the least resistance?
    
    
    
    1. l and A
    2. 2l and A/2
    3. l/2 and 2A
    4. none
20. Inside a solenoid, the magnetic field...
    
    
    
    1. is zero
    2. is uniform
    3. increases with distance from the axis
    4. decreases with distance from the axis
21. When the voltage are in phase in an a.c. circuit...
    
    
    
    1. impedance is zero
    2. reactance is zero
    3. resistance is zero
    4. phase angle is 90°
22. The distance between two consecutive bright fringes increases as...
    
    
    
    1. the wavelength increases
    2. the frequency increases
    3. the wavelength decreases
    4. the separation of two sources increases
23. Photoelectric effect can be explained on the basis of...
    
    
    
    1. the wave theory of light
    2. the theory of relativity
    3. the theory of black-body radiation
    4. none of the above
24. Acoustics is the branch of physics studying...
    
    
    
    1. light
    2. heat
    3. sound
    4. motion of planets
25. The prefix 'pico' represents...
    
    
    
    1. 10^-9
    2. 10^-12
    3. 10⁹
    4. 10¹²
26. The unit vector in the same direction as(-3i + 4j) is...
    
    
    
    1. (-3/5)i + (4/5)j
    2. -i + j
    3. 3i - 4j
    4. (-1/3)i + (1/4)j
27. An 800-kg car moving at 80 kmph overtakes a 1200-kg car moving at 40 kmph in the same direction. If the two cars stick together,the wreckage has an initial speed of...
    
    
    
    1. 8 kmph
    2. 40 kmph
    3. 56 kmph
    4. 60 kmph
28. For a fixed mass of gas in an isothermal process, the plot of V→(1/p) is...
    
    
    
    1. a straight line
    2. a parabola
    3. a nonparabolic curve
    4. a hyperbolic curve
29. When a vapour condenses into liquid...
    
    
    
    1. it absorbs heat
    2. it volves heat
    3. its temperature rises
    4. its temperature falls
30. For a rectangular glass slab, the entering ray and the emerging ray...
    
    
    
    1. are parallel
    2. form a right angle
    3. form an acute angle
    4. form an obtuse angle

1. Any motion along a trajectory distinct from a straight line is a motion with...
   
   
   
   1. constant velocity
   2. changing velocity
   3. zero acceleration
   4. changing acceleration
2. An object that has momentum must also have...
   
   
   
   1. acceleration
   2. impulse
   3. kinetic energy
   4. potential energy
3. The dimensions of strain are...
   
   
   
   1. ML^-1T^-2
   2. ML^-1T^-1
   3. M⁰L^-1T^-2
   4. M⁰L⁰T⁰
4. When the velocity of the molecules is zero, the temperature is...
   
   
   
   1. 0°C
   2. 273 K
   3. -273°C
   4. -273 K
5. The potential energy of a charged capacitor(charge=Q, potential difference=V, capacitance=C) is not represented by...
   
   
   
   1. QV/2
   2. CV²/2
   3. Q²/2C
   4. CQ²/2 
6. When light passes from vacuum into a medium A, the value of the constant in Snell's law is...
   
   
   
   1. the absolute refractive index of A
   2. the absolute refractive index of vacuum
   3. 1
   4. 0
7. Sun's distance from the earth is equal to...
   
   
   
   1. 1 AU
   2. 2 AU
   3. 14 AU
   4. √ 2 AU
8. For an object performing SHM, phase angle is the quantity represented by...
   
   
   
   1. 2πf
   2. 2πft
   3. 2πfT
   4. 2πf/T 
9. The speed needed to put a satellite in orbit does not depend on...
   
   
   
   1. the radius of the orbit
   2. the shape of the orbit
   3. the value of 'g' at the orbit
   4. the mass of the satellite
10. In an adiabatic process, what does not change is...
    
    
    
    1. pressure
    2. volume
    3. temperature
    4. none of the above
11. Inductance is an opposition to...
    
    
    
    1. increasing current
    2. decreasing current
    3. both increasing current and decreasing current
    4. anything but current
12. The voltage lags behind the current by 1/4 cycle in...
    
    
    
    1. a pure capacitor
    2. a pure inductor
    3. a pure resistor
    4. a circuit with capacitance and inductance
13. If the distance between two slits and the distance between the slits and the screen are constant, then the fringe spacing is proportional to...
    
    
    
    1. λ
    2. 1/λ
    3. √λ
    4. 1/√λ
14. If V₀ is the stopping potential, f the frequency of radiation and W₀is the work function of metal, then (V₀ + W₀) is equal to...
    
    
    
    1. hf
    2. h/e
    3. hf/e
    4. f₀
15. The element whose nuclei contain the most tightly bound nucleons is...
    
    
    
    1. He
    2. C
    3. Fe
    4. U
16. An object weighing 0.10 kg is to be swung in a vertical circle of diameter 0.8 m. The minimum velocity needed would be...
    
    
    
    1. 2.0 m/s
    2. 3.0 m/s
    3. 4.0 m/s
    4. 2√ 5 m/s
17. Light is incident upon a rectangular glass block at the polarizing angle. The fraction of light reflected as plane polarized light will be about...
    
    
    
    1. zero
    2. 10%
    3. 50%
    4. 100%
18. A lead bullet at 300 K is fired with the speed of 300 m/s. If the specific heat capacity of lead is 130 J/(kg K), then upon impact its temperature will reach a maximum value of...
    
    
    
    1. 636 K
    2. 646 K
    3. 666 K
    4. 676 K
19. A particle left no tracks in a cloud chamber, did not register on a Geiger-Muller tube and failed to make a zinc sulphide screen glow. It was most likely...
    
    
    
    1. an electron
    2. a proton
    3. a neutron
    4. an alpha particle
20. A fuse is rated at 10 A. In an A.C. circuit, the maximum instantaneous current it could handle would be about...
    
    
    
    1. 7 A
    2. 10 A
    3. 14 A
    4. 20 A
21. 1 micro curie = ______ Bacqueral
    
    
    
    1. 3.7 x 10¹⁰
    2. 3.7 x 10⁷
    3. 3.7 x 10⁴
    4. 10⁶
22. A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration is given by a_c = k²rt² (k = constant). The power delivered to the particle by the force acting on it is...
    
    
    
    1. 2πmk²r²t
    2. mk²r²t
    3. mk⁴r²t⁵/3
    4. 0
23. A ship of mass 3 x 10⁷ kg initially at rest is pulled by a force of 5 x 10⁴ N through a distance of 3 m. Assuming that the resistance due to water is negligible, the speed of the ship is...
    
    
    
    1. 1.5 m/s
    2. 60 m/s
    3. 0.1 m/s
    4. 5 m/s
24. The buoyancy depends on
    
    
    
    1. the depth to which the body is immersed
    2. the shape of the body
    3. the mass of the body
    4. the mass of the liquid displaced
25. Steam at 100°C is passed into 1.1 kg of water contained in a calorimeter with water equivalent 0.02 kg at 15°C till the temperature of the calorimeter and its content rises to 80°C. The mass of the steam condensed in kg is...
    
    
    
    1. 0.130
    2. 0.065
    3. 0.260
    4. 0.135
26. The sound waves that propagate in a metal bar may be...
    
    
    
    1. longitudinal
    2. transverse
    3. torsional
    4. either longitudinal or transverse
27. The fraction of available volume which is filled in case of hexagonal close-packing structure is...
    
    
    
    1. 0.5
    2. 0.74
    3. 0.32
    4. 0.90
28. A photoelectric cell converts...
    
    
    
    1. electrical energy into light energy
    2. light energy into electrical energy
    3. light energy into sound energy
    4. light energy into heat energy.
29. The sensitiveness of a moving-coil galvanometer can be increased by...
    
    
    
    1. increasing the number of turns of the coil
    2. decreasing the number of turns of the coil
    3. decreasing the area of the coil
    4. none of the above
30. If a star emitting yellow light starts moving towards the earth, its colour as seen from the earth will...
    
    
    
    1. turn gradually red
    2. turn gradually blue
    3. remain yellow
    4. turn bright yellow

1. A current of 5 A passes along a wire of length 1.0 m. the wire is at right angles to a magnetic field of flux density of 0.15 T. The force acting on the wire is...
   
   
   
   1. 0
   2. 0.03 N
   3. 0.75 N
   4. 33 N
2. The end product of most radioactive decay series is usually some form of
   
   
   
   1. carbon
   2. helium
   3. hydrogen
   4. lead
3. The cause of surface tension is...
   
   
   
   1. adhesive forces
   2. cohesive forces
   3. external forces
   4. gravitational force
4. The unit 'poise' is...
   
   
   
   1. dyne.sec/cm²
   2. dyne.cm/sec²
   3. newton.sec/m²
   4. dyne.sec/cm
5. Emission line spectrum will be obtained from...
   
   
   
   1. candle flame
   2. sodium lamp
   3. Sun
   4. white hot filament of an electric bulb
6. A hollow insulated brass sphere is positively charged. The electric potential inside the sphere is...
   
   
   
   1. zero
   2. greater than the potential at the surface
   3. smaller than the potential at the surface
   4. the same as that on the surface
7. The linear momentum of a body is P = a + (bt²/2). The force acting on the body is...
   
   
   
   1. a + (bt/2)
   2. a + bt
   3. bt/2
   4. bt
8. The weight of a body on the surface of earth is 100 N. Its weight at a depth half way to the centre of earth will be...
   
   
   
   1. 50 N
   2. 100 N
   3. 25 N
   4. 125 N
9. Two wires C and D of the length in the ratio 2 : 3, diameter in the ratio 2 : 3 and of the same material, are subjected to same force. Then the ratio of their extentions l_c : l_d is...
   
   
   
   1. 3 : 2
   2. 2 : 3
   3. 4 : 9
   4. 8 : 27
10. The potential energy of a harmonic oscillator is maximum when the displacement is equal to...
    
    
    
    1. zero
    2. 1/2 amplitude
    3. amplitude
    4. 1/4 amplitude
11. When the forces acting on a body are in equilibrium, its...
    
    
    
    1. velocity is zero
    2. displacement is zero
    3. acceleration is zero
    4. momentum is zero
12. An object at rest may possess...
    
    
    
    1. velocity
    2. momentum
    3. kinetic energy
    4. potential energy
13. A nonconservative force does not give rise to...
    
    
    
    1. thermal energy
    2. kinetic energy
    3. light energy
    4. potential energy
14. Atoms forming a molecule attain the arrangement in which they obtain...
    
    
    
    1. zero potential energy
    2. minimum potential energy
    3. maximum potential energy
    4. none of the above
15. Bulk modulus of a liquid is...
    
    
    
    1. higher than that for a solid
    2. higher than that for a gas
    3. lower than that for a gas
    4. zero
16. The CGS unit of coefficient of viscosity is...
    
    
    
    1. dyne.second/cm²
    2. newton.second/cm²
    3. dyne.(second)²/cm²
    4. newton.second/cm
17. The volume of a gas sample is directly proportional to its...
    
    
    
    1. Fahrenheit temperature
    2. Celsius temperature
    3. Kelvin temperature
    4. pressure
18. The approximate relationship between the coefficient of linear expansion(α) and the coefficient of cubical expansion(γ) is...
    
    
    
    1. γ = α²
    2. γ = α³
    3. α = 3 γ
    4. γ = 3 α
19. When capacitors are in parallel...
    
    
    
    1. they are all at the same potential
    2. they are at different potentials
    3. their capacitances are equal
    4. the equivalent capacitance is zero
20. The earth's magnetic field at sea level is...
    
    
    
    1. 3 x 10^-9 T
    2. 3 x 10⁹ T
    3. 3 x 10^-5 T
    4. 3 x 10⁵ T
21. Monoatomic gases give...
    
    
    
    1. line spectra
    2. band spectra
    3. continuous spectra
    4. line and band spectra
22. The centre of mass of a rigid body...
    
    
    
    1. lies inside the body
    2. lies outside the body
    3. can be inside or outside of the body
    4. may not exist
23. If 'l' is the length of a simple pendulum and 'T' its period, then 'g' is given by...
    
    
    
    1. (4π²l)/T²
    2. 2π/(√ l/t)
    3. 2πl/t
    4. (4πl²)/t²
24. The rate at which an object radiates electromagnetic energy does not depend on its...
    
    
    
    1. surface area
    2. mass
    3. temperature
    4. ability to absorb radiation
25. Which of the following is neither a basic physical law nor derivable from one?
    
    
    
    1. Coulomb's law
    2. Ohm's law
    3. Kirchhoff's first law
    4. Kirchhoff's second law
26. The power dissipated as heat in an a.c. circuit depends on its...
    
    
    
    1. resistance
    2. inductive reactance
    3. capacitive reactance
    4. impedance
27. Impedance is a maximum at resonance in...
    
    
    
    1. a series RLC circuit
    2. a parallel RLC circuit
    3. all RLC circuits
    4. no RLC circuit
28. Red shift indicates...
    
    
    
    1. recession of star
    2. approaching movement of star
    3. that red light changes to violet
    4. that violet light changes to red
29. The penetration power of beta particles is 1. Then the relative penetration power of gamma rays is...
    
    
    
    1. 1
    2. 100
    3. 1/1000
    4. 1000
30. In a common-base circuit the current gain is...
    
    
    
    1. 0
    2. 1
    3. greater than 1
    4. smaller than 1

1. The equation applicable in the adiabatic process of n mole ideal gas is...
   
   
   
   1. ΔU = nC_pΔT
   2. ΔU = nC_vΔT
   3. ΔQ = nC_vΔT
   4. ΔQ = nC_pΔT
2. In a Carnot's engine, the working substance is...
   
   
   
   1. ideal gas
   2. steam
   3. petrol
   4. CO₂
3. Two particles A and b initially at rest, move towards each other under a mutual force of attraction. At the instant when the speed of A is v and the speed of B is 2v, the speed of centre of mass of the system is
   
   
   
   1. zero
   2. v
   3. 1.5v
   4. 3v
4. Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. The gravitational force of attraction between the planet and the star is proportional to R^(-5/2), then T² is proportional to...
   
   
   
   1. R³
   2. R^(7/2)
   3. R^(3/2)
   4. R^3.75
5. Electrical conductivity increases with the increase in temperature of...
   
   
   
   1. P-type semiconductor
   2. N-type semiconductor
   3. intrinsic semiconductor
   4. none
6. Amount of charge in coulomb required to deposit one gram equivalent of substance by electrolysis is...
   
   
   
   1. 96500
   2. 48 x 10^-10
   3. 6 x 10²⁴
   4. 9600
7. A camera lens is adjusted to f/4 and has an effective diameter of 2.0 cm. Its focal length is...
   
   
   
   1. 0.2 cm
   2. 1.6 cm
   3. 2.0 cm
   4. 8.0 cm
8. The self inductance of a long solenoid is directly affected by changes in all but...
   
   
   
   1. the number of turns
   2. the current
   3. the area of cross section
   4. the relative permeability of the core
9. Which of the following is not the unit of energy ?
   
   
   
   1. joule
   2. erg
   3. newton.metre
   4. dyne
10. All collisions conserve...
    
    
    
    1. kinetic energy
    2. momentum
    3. both kinetic energy and momentum
    4. neither of kinetic energy and momentum
11. If a rocket of initial mass m is to rise from its launching pad, its initial thrust must exceed...
    
    
    
    1. mg/2
    2. mg
    3. 2mg
    4. mg²/2
12. 9 gram of water contains approximately...
    
    
    
    1. 6 x 10²³ molecules of water
    2. 6 x 10²³ atoms of oxygen
    3. 6 x 10²³ atoms of hydrogen
    4. 3 x 10²³ atoms of hydrogen
13. A cable can support a maximum load of W without exceeding the elastic limit. If it is replaced by a cable of same material but half as long and half the diameter, the elastic limit will not be exceeded by the new cable up to a load of...
    
    
    
    1. W/4
    2. W/2
    3. W
    4. 2W
14. Surface tension does not depend on...
    
    
    
    1. surface area
    2. the type of liquid
    3. temperature
    4. medium in contact with the liquid
15. -40° F is equal to...
    
    
    
    1. -40° C
    2. -8° C
    3. -72° C
    4. -104° C
16. The magnitude of the field within a conductor...
    
    
    
    1. depends on the shape of the conductor
    2. is always zero
    3. is always positive
    4. may be zero or positive
17. A permanent magnet does not exert force on...
    
    
    
    1. an unmagnetized iron bar
    2. a magnetized iron bar
    3. a stationary electric charge
    4. a moving electric charge
18. A primary rainbow cannot be seen by an observer looking up if the altitude of the Sun exceeds...
    
    
    
    1. 10°
    2. 20°
    3. 22.5°
    4. 40°
19. According to the descending order of temperature the stars are classified in to the orders O,B,A,F,G,K and M. Our Sun comes in the order...
    
    
    
    1. A
    2. B
    3. G
    4. K
20. Position of the centre of mass of a rigid body depends on...
    
    
    
    1. its shape only
    2. distribution of its matter only
    3. both its shape and distribution of matter
    4. its position relative to the earth.
21. Force is to linear motion as _____ is to rotational motion.
    
    
    
    1. acceleration
    2. torque
    3. moment of inertia
    4. angular momentum
22. A hole is drilled to the centre of the earth and a stone is dropped in to it. When the stone is at the earth's centre, compared to the values at the earth's surface...
    
    
    
    1. its mass and weight both change
    2. its mass and weight both are zero
    3. its mass is unchanged and its weight is zero
    4. its mass is zero and its weight is unchanged
23. For an IC engine, the thermal efficiency depends on...
    
    
    
    1. the compression ratio
    2. the speed of the piston
    3. the temperature of working medium
    4. the diameter of the cylinder
24. A 12-V potential difference is applied across a series combination of four 6-ohm resistors. The current in each resistor is...
    
    
    
    1. 0.5 A
    2. 2 A
    3. 8 A
    4. 18 A
25. The temperature at which the thermo emf becomes zero is known as the...
    
    
    
    1. neutral temperature
    2. absolute temperature
    3. inverse temperature
    4. thermoelectric temperature
26. A transformer uses the principle of...
    
    
    
    1. self-induction
    2. mutual induction
    3. variable resistance
    4. electrostatic attraction
27. If V and V_m are the instantaneous and maximum values, respectively , of voltage in an a.c. circuit, then the mean value of the voltage is...
    
    
    
    1. V_m sinωt
    2. √ 2 V_m
    3. V_m/√ 2
    4. none of the above
28. Electromagnetic waves having wavelengths greater than 200 m are called...
    
    
    
    1. sky waves
    2. ground waves
    3. micro waves
    4. X-rays
29. If θ_m is the angle of diffracted wave with the direction of incidence and d is the width of slit, then m^th order minima is obtained for sinθ_m equal to...
    
    
    
    1. mλ/d
    2. dλ/m
    3. md/λ
    4. m/λd
30. As a sample of a radioactive element decays, its half-life...
    
    
    
    1. decreases
    2. increases
    3. remains the same
    4. changes exponentially.