Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 147 - 150 of 190

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Question number: 147

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

An ice box used for keeping eatable cold has a total wall, area of 1 metre 2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/meter °C. is filled with ice at 0° C along with eatables on a day when the temperature is 40°C. The latent heat of fusion of ice is 334 × 10 3 joules/kg. The amount of ice melted in one day is (1 day = 86400 seconds)

Choices

Choice (4) Response

a.

7760 gm

b.

1552 gm

c.

2776 gm

d.

2069 gm

Question number: 148

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

A stress of 2 kg/mm 2 is applied on a wire. If the modulus of elasticity of the wire is 10 10 dyne/cm 2, then the percentage increase in the length of the wire will be

Choices

Choice (4) Response

a.

0.0098

b.

0.007

c.

0.0028

d.

0.0196

Question number: 149

» Properties of Solids & Liquids » Elastic Behavior

Assertion-Reason▾

Assertion (Ꭺ)

The bridges declared unsafe after a long use.

Reason (Ꭱ)

Elastic strength of bridges losses with time.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 150

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

The temperature of equal masses of three different liquids A, B and C are 12°C, 19 0 C and 28°C respectively. The temperature when A and B are mixed is 16°C and who and C are mixed is 23 0 C. The temperature when A and C are mixed is

Choices

Choice (4) Response

a.

25.2°C

b.

22°C

c.

20.2°C

d.

18.2°C