Properties of Solids & Liquids-Heat Transfer (NEET Physics): Questions 24 - 27 of 40

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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

Question number: 25

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

Two rods A and B are of equal lengths. Their ends are kept between the same temperature and their areas of cross-sections are A 1 and A 2 and thermal conductivities K 1 and K 2. The rate of heat transmission in the two rods will be equal, if

Choices

Choice (4) Response
a.

K1A12=K2A22

b.

K1A1=K2A2

c.

K1=K2

d.

K1A2=K2A1

Question number: 26

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if

Choices

Choice (4) Response
a.

Different volumes of the liquids at the same temperature are taken

b.

Equal volumes of the liquids at the same temperature are taken

c.

Equal masses of the liquids at the same temperature are taken

d.

The masses of the liquids are equal

Question number: 27

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

The rate of loss of heat from a body cooling under conditions of forced convection is proportional to its

(1) Surface area

(2) Excess of temperature over that of surrounding

(3) Heat capacity

(4) Absolute temperature

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response
a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1, 2 and 3 are correct

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