Properties of Solids & Liquids (NEET Physics): Questions 73 - 77 of 190

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Question number: 73

» Properties of Solids & Liquids » Newton's Law of Cooling

MCQ▾

Question

A body initially at 90° C cools to 60° C in 5 minutes and to 50° C in 10 minutes. The temperature of the body after 15 minutes will be

Choices

Choice (4) Response

a.

39.65° C

b.

48.70° C

c.

42.7° C

d.

45° C

Question number: 74

» Properties of Solids & Liquids » Elastic Behavior

MCQ▾

Question

The work done in increasing the length of a one meter long wire of cross-sectional area 1mm 2 through 1mm will be

(Y = 2 × 10 11 N/m 2)

Choices

Choice (4) Response

a.

250 J

b.

5 J

c.

10 J

d.

0.1 J

Question number: 75

» 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: 76

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

Density of a substance at 0°C is 10 gm/cc and at 100°C, its density is 7.7 gm/cc. The coefficient of linear expansion of the substance will be

Choices

Choice (4) Response

a.

Equation 10 2

b.

10 -2

c.

Equation 10 -3

d.

10 -4

Question number: 77

» 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) Equation (2) Equation

(3) There is no relation (4) Equation

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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