Work, Energy and Power (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 9 - 12 of 19

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Question number: 9

» Work, Energy and Power » Kinetic Energy

MCQ▾

Question

A proton (mass 1.67 × 10-27 kg) is accelerated along a straight line by 4.3×1015ms2 . If the length covered is 4.0 cm and initial speed of proton was 3.2×107ms1 , the gain in kinetic energy is –

Choices

Choice (4) Response

a.

2.5 MeV

b.

1.3 MeV

c.

1.8 MeV

d.

3.4 MeV

Question number: 10

» Work, Energy and Power » Work Done

MCQ▾

Question

A block of mass 15 kg slides down a rough slope which is inclined at 600 to the horizontal. The coefficient of sliding friction is 0.25. When the block has slid 10 m, the work done on the block by the force of friction is nearly,

Choices

Choice (4) Response

a.

321.4J

b.

187.5J

c.

150J

d.

115.75 J

Question number: 11

» Work, Energy and Power » Power

MCQ▾

Question

A pump having efficiency 60 % lifts 600 kg water per minute from a 12 m deep well and throws at a speed of 16 ms-1. The power of the pump is –

Choices

Choice (4) Response

a.

1400 W

b.

2500 W

c.

3200 W

d.

2000 W

Question number: 12

» Work, Energy and Power » Conservation of Mechanical Energy

Appeared in Year: 2015

MCQ▾

Question

One end of a slack wire (Young’s modulus Y, length L and cross-sectional area A) is clamped to a rigid wall and the other end to a block (mass m) which rests on a smooth horizontal plane. The block is set in motion with a speed v. What is the maximum distance the block will travel after the wire becomes taut?

Choices

Choice (4) Response

a.

vmL2AY

b.

LmvAY

c.

vmLAY

d.

v2mLAY

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