Properties of Solids & Liquids (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 41 - 45 of 190

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Question number: 41

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

A wire of length lm is stretched by a force of 15 N. The area of cross-section of the wire is 2 × 10 6 m 2 and Y is 2 × l0 -6 N/m 2. Increase in length of the wire will be -

Choices

Choice (4) Response

a.

3.75 × 10 -5 m

b.

4.45 × 10 -5 m

c.

2.25 × 10 -5 m

d.

Question does not provide sufficient data or is vague

Question number: 42

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

For a given material, the Young’s modulus is 2.8 times that of rigidity modulus. It’s Poisson’s ratio is

Choices

Choice (4) Response

a.

2

b.

0.4

c.

1.02

d.

0.2

Question number: 43

» Properties of Solids & Liquids » Thermal Expansion

MCQ▾

Question

Flask is filled up to a mark with 50 cc of mercury at 8°C. If the flask and contents are heated to 38°C, how much mercury will be above the mark? (α for glass is 9 × 10 -6 /°C and coefficient of real expansion of mercury is 180 × 10 -6)

Choices

Choice (4) Response

a.

0.05

b.

0.85 cc

c.

0.46 cc

d.

0.153 cc

Question number: 44

» Properties of Solids & Liquids » Latent Heat

MCQ▾

Question

A lead bullet at 27° 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 = 327°C, specific heat of lead = 0.03 cal/gm °C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)

Choices

Choice (4) Response

a.

307.5 m/sec

b.

1230 m/sec

c.

410 m/sec

d.

Question does not provide sufficient data or is vague

Question number: 45

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

MCQ▾

Question

Which of the following statements are true in case when two water. drops coalesce and make a bigger drop?

(1) Energy is released.

(2) Energy is absorbed.

(3) The surface area of the bigger drop is smaller than the sum of the surface areas of both the drops.

(4) The surface area of the bigger drop is greater than the sum of the surface areas of both the drops.

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 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

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