KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 166 - 169 of 250

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Question number: 166

» 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: 167

» 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

Question number: 168

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

A metal rod of length 50 cm and radius 1.5 cm is covered with an insulating material. One end of the rod is maintained at 1000 C and the other end is immersed in ice at 00 C. It is found that 28.5 g of ice melts in 4 minutes. Calculate the thermal conductivity of metal. Latent heat of fusion of ice = 80 cal g-1.

Choices

Choice (4) Response

a.

282Wm1K1

b.

260Wm1K1

c.

290Wm1K1

d.

274Wm1K1

Question number: 169

» Work, Energy and Power » Kinetic Energy

Appeared in Year: 2015

MCQ▾

Question

A 800 g ball is released from a height of 6 m. Each time it makes contact with the ground it loses 25 % of its energy. The K. E it passes after 3rd hit is –

Choices

Choice (4) Response

a.

18 J

b.

20.25 J

c.

28.25 J

d.

Question does not provide sufficient data or is vague

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