Important Questions of Laws of Motion Physics | Zigya

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201.

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


202.

Assertion: The driver in a vehicle moving with a constant speed on a straight road is in a noninertial frame of reference.

Reason: A reference frame in which Newton's laws of motion are applicable is non-inertial.

  • 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


203.

Three different objects  m, m2 and  m3 to fall from rest and from the same point O along three different frictionless paths. The speeds of the three objects, on reaching the ground, will be in the ratio of

  • m1 : m2 : m3

  • 1 : 1 : 1

  • m1 : 2 m: 3m3

  • 1m1 : 1m2 : 1m3


204.

Assertion:  It is difficult to move a cycle along the road with its brakes on. 

Reason: Sliding friction is greater than rolling friction.

  • If both the assertion and reason are true and reason is a correct explanation of the assertion.

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

  • If the assertion is true but the reason is false.

  • If both assertion and reason are false.


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205.

Assertion:  In an elastic collision of two billiard balls, the total kinetic energy is conserved during the short time of oscillation of the balls (i.e. when they are in contact). 

Reason: Energy spent against friction does not follow the law of conservation of energy.

  • If both the assertion and reason are true and reason is a correct explanation of the assertion.

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

  • If the assertion is true but the reason is false.

  • If both assertion and reason are false.


206.

A particle is revolving in a circle of radius R. If the force acting on it is inversely proportional to R, then the time period is proportional to

  • R

  • R2

  • 1/R

  • 1/R2


207.

If mass of an atom M moving with speed v, what will be its speed after the emission of an α-particle is zero?


208.

Assertion: Work done in uniform circular motion is zero.

Reason:  Force is always directed along displacement.

  • 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 assertion is false but reason is true.


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209.

A ball is moving in a circular path of radius 5 m. If tangential acceleration at any instant is 10 m/s and the net acceleration makes an angle 30° with the centripetal acceleration, then the instantaneous speed is

  • 503m/s

  • 9.3m/s

  • 6.6m/s

  • 5.4m/s


210.

A road is 8 m wide. Its radius of curvature is 40 m. The outer edge is above the lower edge by a distance of 1.2 m. This road is most suited for a velocity of

  • 5.7 m/s

  • 7.7 m/s

  • 36.1 m/s

  • 9.7 m/s


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