NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1236 - 1240 of 2184

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Question number: 1236

» Properties of Solids & Liquids » Application of Surface Tension

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MCQ▾

Question

The temperature at which the surface tension of water is zero

(1) 370° C

(2) 0° C

(3) Slightly less than 647 K

(4) 277 K

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 2 are correct

Question number: 1237

» Wave Optics » Brewster's Law

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MCQ▾

Question

Image of sun formed due to reflection at air water interface is found to be very highly polarized. Refractive index of water being , find the angle of sun above the horizon.

Choices

Choice (4) Response

a.

46.9°

b.

36.9°

c.

26.9°

d.

16.9°

Question number: 1238

» Properties of Solids & Liquids » Elastic Behavior

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MCQ▾

Question

The work done in increasing the length of a one meter long wire of cross-sectional area 1mm 2 through 1mm will be

(Y = 3 × 10 11 N/m 2)

Choices

Choice (4) Response

a.

10 J

b.

250 J

c.

0.15 J

d.

0.1 J

Question number: 1239

» Properties of Solids & Liquids » Latent Heat

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Latent heat of fusion of ice is 336000 J kg -1

Reason (Ꭱ)

Latent heat refers to change of state without any change in temperature.

Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

Question number: 1240

» Properties of Solids & Liquids » Elastic Behavior

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Steel is more elastic than rubber.

Reason (Ꭱ)

Under given deforming force, steel is deformed less than rubber.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false