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CBSE

NEET Physics : Laws of Motion

Multiple Choice Questions

91.

A block of mass m is pulled along a horizontal surface by applying a force at an angle θ with the horizontal. If the block travels with a uniform velocity and has a displacement d and the coefficient of friction is μ then the work done by the applied force is

$\frac{μ mg d}{cosθ + μ sinθ}$
$\frac{μ mg d cosθ}{cosθ + μ sinθ}$
$\frac{μ mg d sinθ}{cosθ + μ sinθ}$
$\frac{μ mg d cosθ}{cosθ - μ sinθ}$

92.

Assertion: Animate object can accelerate in the absence of external force.

Reason: Newton's second law is not applicable on animate object.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason is false.

93.

The force of gravitation is

repulsive
conservative
electrostatic
non-conservative

94.

A ball is bouncing down a flight of stairs. The coefficient of restitution is e. The height of each step is d and the ball descends one step each bounce. After each bounce it rebounds to a height h above the next lower step. The height is large enough compared with the width of step so that the impacts are effectively head-on. Find the relationship between h and d.

h = $\frac{d}{1 - e^{2}}$
h = $\frac{d}{1 + e^{2}}$
h = $\frac{d}{1 + e}$
h = $\sqrt{\frac{d}{1 - e^{2}}}$

95.

Figure shows the variation of energy with the orbit radius r of a satellite in a circular motion. Mark the correct statement

C is total energy, B kinetic energy and A is potential energy.
A is kinetic energy, B total energy and C potential energy
A and 8 are the kinetic and potential energies and C the total energy of the satellite.
C and A arc kinetic and potential energy respectively and B the total energy of the satellite.

96.

A bullet is fired from a rifle and recoils. Kinetic energy of rifile is

less than K.E of bullet
greater than K.E of bullet
equal to K.E of bullet
none of the above

97.

Assertion: Frictional forces are conservative forces.

Reason: Potential energy can be associated with frictional forces.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

98.

Assertion: Angular speed of a planet around the sun increases, when it is closer to the sun.

Reason: Total angular momentum of the system remains constant.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

99.

A particle of mass m moves with constant speed along a circular path of radius r under the action of force F. Its speed is

$\sqrt{\frac{F r}{m}}$
$\sqrt{\frac{F}{r}}$
$\sqrt{Fmr}$
$\sqrt{\frac{F}{m r}}$

100.

Assertion: A wheel moving down a perfectly frictionless inclined plane will undergo slipping (not rolling motion)

Reason: For perfect rolling motion, work done against friction is zero.

If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false

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NEET Physics : Laws of Motion

Multiple Choice Questions