Properties of Solids & Liquids-Heat Transfer (NEET Physics): Questions 32 - 34 of 40

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Question number: 32

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

An ice box used for keeping eatable cold has a total wall, area of 1 metre 2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/meter °C. is filled with ice at 0° C along with eatables on a day when the temperature is 40°C. The latent heat of fusion of ice is 334 × 10 3 joules/kg. The amount of ice melted in one day is (1 day = 86400 seconds)

Choices

Choice (4) Response

a.

7760 gm

b.

1552 gm

c.

2776 gm

d.

2069 gm

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

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