# Properties of Solids & Liquids-Heat Transfer (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 33 - 35 of 40

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## Question number: 33

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

### Question

Two bodies A and B have thermal emissivity of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same. The two bodies emit total radiant power at the same rate. The wavelength λ B corresponding to maximum spectral radiance in the radiation from B is shifted from the wavelength corresponding to maximum spectral radiance in the radiation from A, by 1.00 µm. If the temperature of A is 5802 K

(1) The temperature of B is 1934 K

(2) λ B = 1.5 μm

(3) The temperature of B is 11604 K

(4) The temperature of B is 2901 K

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

### Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1 and 2 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

## Question number: 34

» Properties of Solids & Liquids » Heat Transfer » Radiation

MCQ▾

### Question

A body cools from 90° 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.

56.40° C

b.

34.61° C

c.

46.75° C

d.

42.85° C

## Question number: 35

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

### Question

When fluids are heated from the bottom, convection currents are produced because

### Choices

Choice (4) Response

a.

Heated fluid becomes less dense than the cold fluid above it

b.

Molecular motion of fluid becomes aligned

c.

Heated fluid becomes more dense than the cold fluid above it

d.

Molecular collisions take place within the fluid

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