Properties of Solids & Liquids [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 102 - 105 of 453

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Question 102

Question MCQ▾

A room is maintained at 20°C by a heater of resistance 20 ohm connected to 400 volt mains. The temperature is uniform throughout the room and heat is transmitted through a glass window of area 4 m2 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.

24.15 °C

b.

15.023 °C

c.

15.25 °C

d.

All of the above

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Question 103

Question MCQ▾

Which graph represents the variation of surface tension with temperature over small temperature ranges for water?

Choices

Choice (4)Response

a.

b.

c.

d.

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Passage

Read the passage given below and answer the questions that follow:

A bar of cross section A is subjected to equal and opposite tensile forces F at its ends. Consider a plane through the bar making an angle θ with a plane at right angles to the bar as shown in figure.

Question 104 (1 of 1 Based on Passage) Show Passage

Question MCQ▾

The tensile stress, at this plane in terms of F, A and θ is

Choices

Choice (4)Response

a.

b.

c.

d.

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Question 105

Question MCQ▾

The force required to separate two glass plates of area 10-2 m2 with a film of water 0.05 mm thick between them, is (Surface tension of water is 70 × 10-3 N/m)

Choices

Choice (4)Response

a.

38 AT

b.

28 N

c.

14 N

d.

50 N

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