# 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.

10 2

b.

10 -2

c.

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) (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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