# Properties of Solids & Liquids-Heat Transfer (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 22 - 24 of 40

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## Question number: 22

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

### Question

Two rods (one semi-circular and other straight) of same material and of same cross-sectional area are joined as shown in the figure. The points A and B are maintained at different temperature. The ratio of the heat transferred through a cross-section of a semi-circular rod to the heat transferred through a cross section of the straight rod in a given time is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 23

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

### Question

Two thermometers A and B are exposed in sunlight. The bulb of A is painted black, But that of B is not painted. The correct statement regarding this case is

### Choices

Choice (4) Response

a.

Temperature of A will rise faster than B but the final temperature will be the same

b.

Temperature of B will rise faster

c.

Temperature of A will remain more than B

d.

A and B show equal rise in beginning

## Question number: 24

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

### Question

A room is maintained at 20°C by a heater of resistance 20 ohm connected to 400 volt mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area 4 m 2 and thickness 0.2 cm. What will be the temperature outside? Given that thermal conductivity K for glass is 0.2 cal/m/°C/sec and J = 4.2 J/cal

### Choices

Choice (4) Response

a.

15.25 °C

b.

15.023 °C

c.

24.15 °C

d.

Question does not provide sufficient data or is vague

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