Properties of Solids & Liquids-Heat Transfer (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 14 - 17 of 40

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Question number: 14

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A room is maintained at 20°C by a heater of resistance 20 ohm connected to 200 volt mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area l 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.

15.24°C

b.

24.15°C

c.

15.00°C

d.

All of the above

Question number: 15

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3. The Wein’s constant b = 2.88 x 10 6 nm K. Then

Choices

Choice (4) Response

a.

b.

c.

U 1 > U 2

d.

U 2 > U 1

Question number: 16

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

Question

A body cools from 60° C to 50° C in 10 minutes. If the room temperature is 25° C and assuming Newton ’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be

Choices

Choice (4) Response

a.

42.85° C

b.

40° C

c.

45° C

d.

38.5° C

Question number: 17

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A cane is taken out from a refrigerator at 0°C. The atmospheric temperature is 25°C. If t 1 is the time taken to heat from 0°C to 5°C and t 2 is the time taken from 10°C to 15°C, then the wrong statements are

(1) (2)

(3) There is no relation (4)

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

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

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