# Properties of Solids & Liquids (NEET Physics): Questions 56 - 58 of 190

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## Question number: 56

» 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: 57

» Properties of Solids & Liquids » Application of Surface Tension

MCQ▾

### Question

An air bubble in a water tank rises from the bottom to the top. Which of the following statements are true?

(1) Bubble rises upwards because pressure at the bottom is greater than that at the top.

(2) As the bubble rises, its size increases.

(3) Bubble rises upwards because pressure at the bottom is less than that at the top.

(4) As the bubble rises, its size decreases.

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 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

## Question number: 58

» Properties of Solids & Liquids » Latent Heat

MCQ▾

### Question

A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)

### Choices

Choice (4) Response

a.

4.010 m/sec

b.

0.365 m/sec

c.

307.5 m/sec

d.

None of the above

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