NEET TEST SERIES 99 PHYSICS

4. A car accelerates from rest at a constant rate ‘α’ for some time after which it decelerates at a constant rate ‘β’ to come to rest. If the total time elapsed is t, maximum velocity reached by the car is

5. A ball is moving with speed 20 m/s collides with a smooth surface as shown in figure. The magnitude of change in velocity in m/s of the ball will be:


a) 10√3
b) 40√3
c) 20
d) 20√3

6. If impulse I varies with time t as I = (30t²-360t) kgms^-1. The change in momentum is minimum at t equals

a) 5s
b) 6s
c) 4s
d) 3s

7. The horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and wall is 0.2. The weight of the block is

a) 2 N
b) 10 N
c) 20 N
d) none

8. An older model car accelerates from 0 to speed v in a time interval of Δt. A newer, more powerful sports car accelerates from 0 to 3v in the same time period. Assuming the energy coming from the engine appears only as kinetic energy of the cars and that the cars are of same mass. Choose correct statement

a) The power of the sports car is three times that of the older-model car
b) The power of the sports car is six times that of the older-model car
c) The power of the sports car is equal that of the older-model car
d) The power of the sports car is nine times that of the older-model car

9. A wheel having moment of inertia 2 kgm²about its vertical axis, rotates at the rate of 120 rpm about the axis. the torque which can stop the wheel’s rotation in 90 seconds would be

10. A thin wire of length L and uniform linear mass density ρ is bent into a circular loop with centre at O as shown. The moment of inertia of loop about axis XX’ is

11. Match the column-I with column-II, for a satellite in circular orbit

(Where M_E is the mass of the earth, m is mass of the satellite and r is the radius of the orbit)
a) A–r, B–s, C–q, D–p
b) A–s, B–r, C–p, D–q
c) A–p, B–q, C–s, D–r
d) A–q, B–p, C–r, D–s

12. A projectile is fired with a speed v=√2gRfrom the surface of earth. It escapes the gravitational pull of earth. Its speed in interstellar space will be

a) 2gR
b) √2gR
c) gr²
d) √gR

13. A body is rolling down an inclined plane. If kinetic energy of rotation is 40% of kinetic energy in translatory state, then the body is a

a) cylinder
b) circular ring
c) solid sphere
d) none

14. Consider the following statements and choose the correct option among the following.
Statement-A: In pure translational motion at any instant of time, all particles of the body have the same velocity.
Statement-B: In pure rotation of the rigid body about a fixed axis, every particle of the body moves in a circle, which lies in a plane parallel to the axis and has its centre on the axis.

a) Both A & B are correct
b) Neither A is correct nor B is correct
c) A is incorrect and B is correct
d) A is correct and B is incorrect

15. Two-point masses m₁ and m₂ at rest in gravity-free space are released from distance d. Find the velocity of centre of mass of system in m/s at the time of collision of masses

a) 0
b) 1/2
c) 1/3
d) 1

16. A metal sheet with a circular hole is heated. The hole

a) gets larger
b) gets smaller
c) remains of the same size
d) gets deformed

17. In a water-fall the water falls from a height of 100 m. If the entire K.E. of water is converted into heat, the rise in temperature of water will be

a) 0.23 °C
b) 0.46 °C
c) 2.3 °C
d) 0.023 °C

18. In a cyclic process, work done by the system is

a) zero
b) equal to heat given to the system
c) more than heat given to the system
d) independent of heat given to the system

19. Choose the incorrect statement related to an isobaric process.

a) V/T=constant
b) W = PΔV
c) Heat given to a system is used up in raising the temperature only.
d) D. ΔQ > W

20. A diatomic ideal gas undergoes a thermodynamic change according to the P-V diagram shown in the figure. The total heat given to the gas is nearly (use ln 2 = 0.7)


a) 2.5 P₀ V₀
b) 1.4 P₀ V₀
c) 1.1 P₀ V₀
d) 3.9 P₀ V₀