Work, Energy and Power-Conservative and Non-Conservative Forces (KVPY Stream-SA (Class 11) Physics): Questions 1 - 3 of 3

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Question number: 1

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2014

MCQ▾

Question

Two positively charged spheres of masses m1, and m2, are suspended from a common point at the ceiling by identical insulating massless strings of length l. Charges on the two spheres are q1 and q2, respectively. At equilibrium both strings make the same angle θ with the vertical. Then

Choices

Choice (4) Response

a.

q2m1=q1m2

b.

q1m1=q2m2

c.

m1=m2

d.

m1=m2sinθ

Question number: 2

» Work, Energy and Power » Conservative and Non-Conservative Forces

MCQ▾

Question

A box, when hung from a spring balance shows a reading of 35 kg inside an evacuated chamber. If the same box is hung from the same spring balance outside an evacuated chamber, the reading on the scale will be,

Choices

Choice (4) Response

a.

35 kg because the effect of the absence of the atmosphere will be identical on the box and the spring balance

b.

35 kg because the mass of the box remains unchanged

c.

Less than 35 kg because the atmospheric buoyancy force will be present

d.

More than 35 kg because the spring constant is lower in air.

Question number: 3

» Work, Energy and Power » Conservative and Non-Conservative Forces

MCQ▾

Question

The height of a waterfall is 75 m, If the water at the bottom of the fall is at rest. Calculate the difference between temperature of water at the top and bottom of the fall (specific heat of water =4.2103Jkg0C and g=9.8ms2 ).

Choices

Choice (4) Response

a.

0.175 0C

b.

0.97 0C

c.

0.126 0C

d.

0.117 0C

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