Assertion: The condition of equilibrium for a rigid body is - Translational equilibrium: ∑ F → = 0 , (i.e. the sum of all external forces equal to zero.) Rotational equilibrium : ∑ τ → = 0 (i.e. the sum of all external torques equal to zero.) Reason: A rigid body must be in equilibrium under the action of two equal and opposite forces.

If assertion is true but the reason is false.

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

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

If both assertion and reason are false.

MEDIUM

NEET

IMPORTANT

Earn 100

Assertion: A couple does not exert a net force on an object even though it exerts a torque.
Reason: A couple is a pair of two forces with an equal magnitude but opposite directions acting simultaneously on a body in different lines of action.

20% studentsanswered this correctly

Important Questions on Rotational Mechanics

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 7

Assertion: The total distance moved by any point on the periphery of a wheel of radius

R

along the surface in one revolution is

2 π R

.
Reason: In the rolling motion of a wheel, every point on its periphery comes in contact with the surface once in one revolution.

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 8

Assertion: To unscrew a rusted nut, we need a pipe wrench with longer arm.

Reason :Wrench with longer arm reduces the required force applied on the arm

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 9

Assertion: The condition of equilibrium for a rigid body is -
Translational equilibrium:

\sum_{} \vec{F} = 0

, (i.e. the sum of all external forces equal to zero.)
Rotational equilibrium :

\sum_{} \vec{τ} = 0

(i.e. the sum of all external torques equal to zero.)
Reason: A rigid body must be in equilibrium under the action of two equal and opposite forces.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 10

Assertion: For the purpose of calculation of moment of inertia, the body’s mass can be assumed to be concentrated at its centre of mass.
Reason: The moment of inertia of the rigid body about an axis passing through its centre of mass is zero.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 11

Assertion: Many great rivers flow towards the equator. The small particle that they carry increases the time of rotation of the earth about its own axis.
Reason: The angular momentum of the earth about its rotation axis is conserved.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 12

Assertion: The spokes near the top of a rolling bicycle wheel are more blurred than those near the bottom of the wheel.
Reason: The spokes near the top of the wheel are moving faster than those near the bottom of the wheel.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 13

Assertion: A wheel moving down a perfectly frictionless inclined plane will undergo slipping (not rolling).
Reason: For pure rolling, work done against frictional force is zero.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 10 - Rotational Mechanics>Exercise (Assertion & Reason)>Q 14

Assertion: Angular momentum may not necessarily be parallel to the angular velocity vector.
Reason: The body may not be symmetrical about its axis of rotation.

Assertion: A couple does not exert a net force on an object even though it exerts a torque. Reason: A couple is a pair of two forces with an equal magnitude but opposite directions acting simultaneously on a body in different lines of action.

Important Questions on Rotational Mechanics

Learn and Prepare for any exam you want !

Assertion: A couple does not exert a net force on an object even though it exerts a torque.
Reason: A couple is a pair of two forces with an equal magnitude but opposite directions acting simultaneously on a body in different lines of action.