NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1269 - 1271 of 2184

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Question number: 1269

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

Question

During the melting of a slab of ice at 273 K and one atmospheric pressure

(1) Positive work is done on the ice-water system by the atmosphere

(2) Positive work is done by ice-water system on the atmosphere

(3) The internal energy of the ice-water system increases

(4) The internal energy of the ice-water system decreases

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 ate correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 1270

» Properties of Solids & Liquids » Heat Transfer » Conduction

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Question

Three rods of the same dimension have thermal conductivities 4K, 2K and 2K. They are arranged as shown in fig. with their ends at 100°C, 50°C and 20°C. The temperature of their junction is

Three rod of same dimension 4K, 2K and 2K

Three Rod of Same Dimension 4K, 2K and 2K

In above fig show three rod of same dimension having thermal conductivities 4K, 2K and K.

Choices

Choice (4) Response

a.

70.45°C

b.

67.5°C

c.

35.3°C

d.

50.43°C

Question number: 1271

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

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MCQ▾

Question

A solid sphere of density n ( > 1) times lighter than water is suspended in a water tank by a string tied to its base as shown in fig. If the mass of the sphere is m then the tension in the string is given by

Solid sphere in water lighter than water

Solid Sphere in Water Lighter Than Water

Here in above fig we show that the sphere in water tank suspended by a string tied to its base.

Choices

Choice (4) Response

a.

b.

c.

d.