NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1535 - 1540 of 2142

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Question number: 1535

» Atoms and Nuclei » Radioactive Decay Law

MCQ▾

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.

25, 000

c.

20, 000

d.

12, 500

Question number: 1536

» Thermodynamics » Concept of Temperature

MCQ▾

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.

127°C

b.

327°C

c.

27ºC

d.

227ºC

Question number: 1537

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

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.

3.8 ⨯ 10 14 kg.

b.

7.6 ⨯ 10 14 kg

c.

3.8 ⨯ 10 12 kg

d.

4.4 ⨯ 10 9 kg

Question number: 1538

» Atoms and Nuclei » Radioactivity

MCQ▾

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

Question number: 1539

» Thermodynamics » Concept of Temperature

MCQ▾

Question

How much work to be done in decreasing the volume of and ideal gas by an amount of 1.4 × 10 -4 m 3 at normal temperature and constant normal pressure of 1 × 10 -5N/ m 2

Choices

Choice (4) Response

a.

14 Joule

b.

28 Joule

c.

25 Joule

d.

27 Joule

Question number: 1540

» Thermodynamics » Thermal Equilibrium

MCQ▾

Question

A monoatomic ideal gas, initially at temperature T 1 is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature T 2 by releasing the piston suddenly. If I 1 and I 2 are the lengths of the gas column before and after expansion respectively, then Equation is given by

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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