NEET Physics: Questions 1495 - 1499 of 2098

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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 V¯,VrmsandVp 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) VP<V¯<Vrms

(2) The average kinetic energy of a molecule is 34mVP2 .

(3) No molecule can have speed greater than 2Vrms

(4) No molecule can have speed less than VP2

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 (14) 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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