NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1203 - 1206 of 2320

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Question number: 1203

» Properties of Solids & Liquids » Latent Heat

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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.

1230 m/sec

b.

410 m/sec

c.

307.5 m/sec

d.

All of the above

Question number: 1204

» Dual Nature of Matter and Radiation » De-Broglie Relation

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MCQ▾

Question

Which of the following figure represents variation of particle momentum and the associated de-Broglie wavelength?

Choices

Choice (4)Response

a.

Plot of momentum vs de-Broglie wavelength – Choice A

Plot of Momentum vs De-Broglie Wavelength – Choice A

b.

Plot of momentum vs de-Broglie wavelength – Choice B

Plot of Momentum vs De-Broglie Wavelength – Choice B

c.

Plot of momentum vs de-Broglie wavelength – Choice C

Plot of Momentum vs De-Broglie Wavelength – Choice C

d.

Plot of momentum vs de-Broglie wavelength – Choice D

Plot of Momentum vs De-Broglie Wavelength – Choice D

Question number: 1205

» Ray Optics » Resolving Power of Microscopes and Astronomical Telescopes

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MCQ▾

Question

What should be the size of the aperture of the objective of telescope which can just resolve the two stars of angular width of 10 -3 degree by light of wavelength 5000Å?

Choices

Choice (4)Response

a.

3.5 km

b.

3.5 m

c.

3.5 mm

d.

3.5 cm

Question number: 1206

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

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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.

2 and 4 are correct

b.

1,2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

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