Properties of Solids & Liquids (KVPY Stream-SA (Class 11) Physics): Questions 7 - 10 of 27

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Question number: 7

» Properties of Solids & Liquids » Thermal Expansion

Appeared in Year: 2012

MCQ▾

Question

A circular metallic ring of radius R has a small gap of width d. The coefficient of thermal expansion of the metal is α in appropriate units. If we increase the temperature of the ring by an amount ΔT, then width of the gap:

Choices

Choice (4) Response

a.

will decrease by an amount dαΔT

b.

will not change

c.

will increase by an amount (2πR – d) αΔT

d.

will increase by an amount dαΔT

Question number: 8

» Properties of Solids & Liquids » Temperature

MCQ▾

Question

The energy emitted per second by a black body at 300 C is 15 J. When the temperature of the black body is raised to 2500 C, the energy per second will be

Choices

Choice (4) Response

a.

85 J

b.

130 J

c.

133 J

d.

88 J

Question number: 9

» Properties of Solids & Liquids » Surface Energy and Surface Tension

Appeared in Year: 2014

MCQ▾

Question

Ice is used in a cooler in order to cool its contents. Which of the following will speed up the cooling process?

Choices

Choice (4) Response

a.

Drain the water from the cooler periodically

b.

Put the ice as a single block

c.

Wrap the ice in a metal foil

d.

Crush the ice

Question number: 10

» Properties of Solids & Liquids » Application of Surface Tension

Appeared in Year: 2014

MCQ▾

Question

A box, when hung from a spring balance shows a reading of 50 kg. If the same box is hung from the same spring balance inside an evacuated chamber, the reading on the scale will be.

Choices

Choice (4) Response

a.

More than 50 kg because the atmospheric buoyancy force will be absent

b.

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

c.

50 kg because the mass of the box remains unchanged

d.

Less than 50 kg because the weight of the column of air on the box will be absent

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