[Class 11th - Physics - Work, Energy and Power - MERIT YARD]

[Class 11 - Work, Energy & Power]

Question 1 / 40The SI unit of Work is:

A) Newton

B) Joule

C) Watt

D) Pascal

Question 2 / 40Work done is a ________ quantity.

A) Vector

B) Scalar

C) Tensor

D) None

Question 3 / 40If Force and Displacement are perpendicular (90°), work done is:

A) Maximum

B) Negative

C) Zero

D) Minimum

Question 4 / 40The energy possessed by a body due to its motion is:

A) Kinetic Energy

B) Potential Energy

C) Thermal Energy

D) Electric Energy

Question 5 / 40Formula for Kinetic Energy is:

A) mgh

B) mv

C) ½ mv²

D) ma

Question 6 / 40Work-Energy Theorem states that Work done is equal to:

A) Change in Momentum

B) Change in Kinetic Energy

C) Change in Force

D) Change in Time

Question 7 / 40Potential Energy of a body at height 'h' is:

A) ½ mv²

B) mgh

C) F × d

D) mg/h

Question 8 / 40Rate of doing work is called:

A) Force

B) Energy

C) Power

D) Impulse

Question 9 / 401 Horse Power (HP) equals:

A) 1000 W

B) 746 W

C) 500 W

D) 750 W

Question 10 / 40In an Elastic Collision, which quantity is conserved?

A) Only Momentum

B) Only KE

C) Both Momentum & KE

D) Neither

Question 11 / 40In an Inelastic Collision:

A) Momentum conserved, KE not conserved

B) KE conserved, Momentum not

C) Both conserved

D) Neither conserved

Question 12 / 40Which of these is a Conservative Force?

A) Friction

B) Gravitational Force

C) Viscous Force

D) Air Resistance

Question 13 / 40Spring Force is an example of:

A) Conservative Force

B) Non-conservative Force

C) Frictional Force

D) Magnetic Force

Question 14 / 40Energy stored in a spring (Spring Constant k, extension x) is:

A) kx

B) kx²

C) ½ kx²

D) ½ k²x

Question 15 / 40If momentum of a body is doubled, its Kinetic Energy becomes:

A) Double

B) 4 times

C) Half

D) Same

Question 16 / 40Formula for Power in terms of Force and Velocity is:

A) P = F.v

B) P = F/v

C) P = F × t

D) P = v/F

Question 17 / 40Area under Force-Displacement graph represents:

A) Power

B) Acceleration

C) Work Done

D) Momentum

Question 18 / 40Kilowatt-hour (kWh) is a unit of:

A) Power

B) Force

C) Energy

D) Current

Question 19 / 40Work done by Centripetal Force is always:

A) Positive

B) Negative

C) Zero

D) Maximum

Question 20 / 401 kWh is equal to:

A) 3.6 × 10⁵ J

B) 3.6 × 10⁶ J

C) 1000 J

D) 3600 J

Question 21 / 40Work done by Friction is usually:

A) Positive

B) Negative

C) Zero

D) Undefined

Question 22 / 40Mechanical Energy is sum of:

A) KE + Heat

B) PE + Heat

C) KE + PE

D) Power + Work

Question 23 / 40Coefficient of restitution 'e' for perfectly elastic collision is:

A) 0

B) 1

C) -1

D) 0.5

Question 24 / 40For perfectly inelastic collision, 'e' is:

A) 0

B) 1

C) Infinity

D) 0.5

Question 25 / 40Relation between KE (K) and Momentum (p):

A) K = p²/m

B) K = p²/2m

C) K = p/2m

D) K = pv

Question 26 / 40Work done against gravity in lifting a mass 'm' to height 'h':

A) Zero

B) mgh

C) -mgh

D) 1/2 mgh

Question 27 / 40A body falls freely. Its total mechanical energy:

A) Increases

B) Decreases

C) Remains Constant

D) Becomes zero

Question 28 / 40Electron Volt (eV) is a unit of:

A) Potential

B) Charge

C) Energy

D) Power

Question 29 / 40A man pushes a wall but fails to move it. Work done is:

A) Positive

B) Negative

C) Zero

D) Maximum

Question 30 / 40Which is not a unit of energy?

A) Joule

B) Calorie

C) Kilowatt

D) Erg

Question 31 / 40Two bodies of mass 1kg and 4kg have equal momentum. Ratio of their KE is:

A) 1:4

B) 4:1

C) 1:1

D) 1:2

Question 32 / 40When a spring is compressed, its Potential Energy:

A) Increases

B) Decreases

C) Remains Same

D) Becomes Zero

Question 33 / 40Work done by a conservative force in a closed path is:

A) Positive

B) Negative

C) Zero

D) Infinite

Question 34 / 40Dimensional formula of Work is:

A) [MLT⁻¹]

B) [ML²T⁻²]

C) [MLT⁻²]

D) [ML²T⁻¹]

Question 35 / 40A bullet gets embedded in a wooden block. This is:

A) Elastic Collision

B) Perfectly Inelastic Collision

C) Explosion

D) None

Question 36 / 40Power of a water pump is 2 kW. How much work can it do in 1 minute?

A) 2000 J

B) 120 J

C) 120,000 J

D) 60,000 J

Question 37 / 40If Kinetic Energy is constant, work done by net force is:

A) Zero

B) Positive

C) Negative

D) Infinite

Question 38 / 40A light and heavy body have equal KE. Which has greater momentum?

A) Light body

B) Heavy body

C) Both equal

D) Cannot say

Question 39 / 40The slope of Work-Time graph gives:

A) Force

B) Energy

C) Power

D) Velocity

Question 40 / 40Total energy of an isolated system:

A) Increases

B) Decreases

C) Remains Conserved

D) Becomes zero

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