NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1495 - 1499 of 2142

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Question number: 1495

» Kinetic Theory of Gases » Kinetic Energy and Temperature

MCQ▾

Question

If pressure of a gas contained in a closed vessel is increased 0.4 % when heated by 1°C, the initial temperature must be

Choices

Choice (4) Response

a.

250°C

b.

2500 K

c.

25°C

d.

250 K

Question number: 1496

» Kinetic Theory of Gases » Kinetic Energy and Temperature

MCQ▾

Question

Let Equation respectively denote the mean speed, root mean square speed and most probable speed of the molecules in an ideal monoatomic gas at absolute temperature T, the mass of a molecule is m. Then

(1) Equation

(2) The average kinetic energy of a molecule is Equation .

(3) No molecule can have speed greater than Equation

(4) No molecule can have speed less than Equation

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

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1 and 2 are correct

Question number: 1497

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

MCQ▾

Question

150 J of heat is added to a gaseous system, whose internal energy change is 40 J, then the amount of external work done is

Choices

Choice (4) Response

a.

40 J

b.

70 J

c.

110 J

d.

150 J

Question number: 1498

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

The radioactivity of an element becomes Equation th of its original value in 60 seconds. Then the value of half-life time is,

Choices

Choice (4) Response

a.

5 sec

b.

20 sec

c.

10 sec

d.

30 sec

Question number: 1499

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

Question

On disintegration of one atom of U 235 the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 KW. Then

(1) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 16

(2) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 18

(3) Decay in mass per hour is 4 ⨯ 10 -8 kg

(4) Decay in mass per hour is 4 ⨯ 10 -6 kg

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

1, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 2 are correct

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