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Chapter 5: Properties of Matter & Thermal Physics (Set-1)
The property of a material to regain its original shape after deformation is called: A Plasticity B Elasticity C Ductility D Rigidity Explanation Elasticity is the ability of a body to return to its original configuration after deforming forces are removed. Young’s modulus has the same dimension as: A Energy B Pressure C Force D…
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Chapter 4: Rotational Motion & Gravitation (Set-4)
Angular momentum of a rotating rigid body depends on: A Torque only B Radius only C Moment of inertia & angular velocity D Linear speed only Explanation L = Iω. A larger lever arm produces: A Smaller torque B Larger torque C Zero torque D Constant torque Explanation Torque = rF. Angular momentum is conserved…
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Chapter 4: Rotational Motion & Gravitation (Set-3)
Torque depends on: A Force only B Distance only C Both force & perpendicular distance D Mass distribution Explanation τ = r⊥F. Angular momentum of a system changes when: A Internal torque acts B No torque acts C External torque acts D Mass increases Explanation Only external torque changes L. A bicycle wheel maintains direction…
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Chapter 4: Rotational Motion & Gravitation (Set-2)
Angular momentum of a rigid body rotating with angular velocity ω is: A L = mv B L = Iω C L = rF D L = ω/r Explanation For rigid bodies, L = Iω. Torque is maximum when angle between force and lever arm is: A 0° B 30° C 90° D 180° Explanation…
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Chapter 4: Rotational Motion & Gravitation (Set-1)
Torque is defined as: A r×p B r×F C F×t D p×v Explanation Torque is the cross product of position vector and force. SI unit of torque is: A N B J C N·m D J/s Explanation Since torque = force × perpendicular distance. Angular momentum of a particle is given by: A Iα B…
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Chapter 3: Work, Energy, Power & System of Particles (Set-4)
Net work done on a body is equal to: A Change in potential energy B Change in kinetic energy C Change in mass D Change in force Explanation Work–energy theorem: Wnet=ΔKE. A force acts at an angle of 90°. Work done is: A Maximum B Minimum positive C Negative D Zero Explanation W=Fdcos90°=0. If a…
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Chapter 3: Work, Energy, Power & System of Particles (Set-3)
Work done by a force is positive when: A Force opposes motion B Force and displacement are in same direction C Force is perpendicular D Body is at rest Explanation Positive work occurs when displacement aligns with force. Work–energy theorem relates work to: A Change in PE B Change in KE C Change in mass…
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Chapter 3: Work, Energy, Power & System of Particles (Set-2)
Work done by a constant force is calculated using: A F/t B Fdcosθ C Fv D d/v Explanation Work is dot product of force and displacement. A body does zero work when: A It moves opposite the force B It does not move C A large force acts D Speed increases Explanation Zero displacement →…
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Chapter 3: Work, Energy, Power & System of Particles (Set-1)
Work is said to be done when: A Force acts for any time B Force causes a displacement C Body has mass D Body has velocity Explanation Work is defined as the product of force and displacement. When force and displacement are perpendicular, work done is: A Maximum B Zero C Minimum positive D Negative…
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Chapter 2: Kinematics, Laws of Motion & Non-Inertial Frames (Set-4)
A mass suspended from a spring inside a freely falling elevator will appear to have: A increased weight B decreased weight C zero weight D oscillations with higher frequency Explanation In free fall, effective g = 0 ⇒ apparent weight = 0. The linear momentum of a system changes only when: A mass changes B…
