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CBSE

Subject

Physics

NEET Physics : Laws of Motion

Multiple Choice Questions

51.

A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction of 0.64. The maximum velocity with which the car can be moved is

11.2m/s
112m/s
$\frac{0.64 \times 20}{1000 \times 100} m / s$
$\frac{1000}{64 \times 20} m / s$

52.

A particle of mass m moving with velocity v collides with a stationary particle of mass 2m. The speed of the system, will be

3v
$\frac{v}{2}$
$\frac{v}{3}$
2v

53.

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms'.The kinetic energy of the other mass is

256 J
486 J
524 J
324 J

54.

The angle through which a cyclist bends when he covers a circular path of 34.3 m circumference in $\sqrt{22}$ sec is (g=9.8 m/s)

15⁰
30⁰
60⁰
45⁰

55.

Two weights w₁ and w₂ are suspended to the two strings on a frictionless pulley. When the pulley is pulled up with an acceleration g, then the tension in the string is :

56.

A body is moving in a circular path with acceleration 'a'. If its velocity gets doubled, find the ratio of acceleration after and before the change

1:4
$\frac{1}{4} : 1$
2:1
4:1

57.

A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle θ. The frictional force

converts translational energy to rotational energy
dissipates energy as heat
decreases the rotational motion
decreases the rotational and translational motion

58.

A cone filled with water is revolved in a vertical circle of radius 4 m and the water does not fall down. What must be the maximum period of revolution?

59.

A body of mass 0.1 kg attains a velocity of 10 ms' in 0.1 sec. The force acting on the body is

10N
0.01N
0.1N
100N

60.

$Which is true for rolling frictrion (μ_{r}), static friction (μ_{s}) and kinetic friction (μ_{k}) :$

$μ_{s} > μ_{k} > μ_{r}$
$μ_{s} < μ_{k} < μ_{r}$
$μ_{s} < μ_{k} > μ_{r}$
$μ_{s} > μ_{r} > μ_{k}$

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