NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1534 - 1539 of 2184

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Question number: 1534

» Kinetic Theory of Gases » Equation of State of a Perfect Gas

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Question

Gas at a pressure P 0 is contained in a vessel. If the mass of all the molecules are halved and their speeds an doubled, the resulting pressure p will be equal to

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1535

» Atoms and Nuclei » Mass-Energy Relation

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Question

Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is a. m. u-

Choices

Choice (4) Response

a.

0.213 MeV

b.

0.321 MeV

c.

0.465 MeV

d.

0.123 MeV

Question number: 1536

» Atoms and Nuclei » Radioactive Decay Law

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Question

Half-life of Bi 210 is 5 days. If we start with 50,000 atoms of this isotope, the number of atoms left over after 10 days is

Choices

Choice (4) Response

a.

5,000

b.

12,500

c.

25,000

d.

20,000

Question number: 1537

» Thermodynamics » Concept of Temperature

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Question

The temperature of sink of Carnot engine is 27°C and Efficiency of engine is 25%. Then temperature of source

Choices

Choice (4) Response

a.

27ºC

b.

127°C

c.

327°C

d.

227ºC

Question number: 1538

» Atoms and Nuclei » Mass-Energy Relation

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Question

Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m 2. The average distance between the earth and the sun is 1.5 ⨯ 10 n m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)

Choices

Choice (4) Response

a.

4.4 ⨯ 10 9 kg

b.

7.6 ⨯ 10 14 kg

c.

3.8 ⨯ 10 12 kg

d.

3.8 ⨯ 10 14 kg.

Question number: 1539

» Atoms and Nuclei » Radioactivity

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Question

If 92 U 238 undergoes successively 8 α -decays and 6 β -decays, then resulting nucleus is,

Choices

Choice (4) Response

a.

82 U 206

b.

82 U 214

c.

82 U 210

d.

82 Pb 206