# 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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