Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 55 - 57 of 190

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Question number: 55

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

A homogeneous solid cylinder of length L and cross-sectional area is immersed such that it floats with its axis vertical at the liquid-liquid interface with length in the denser liquid as shown in the fig. The lower density liquid is open to atmosphere having pressure P Q. Then density of solid is given by

Choices

Choice (4) Response

a.

b.

c.

d.

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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

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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

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