NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1497 - 1501 of 2142

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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 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

Question number: 1500

» Thermodynamics » Concept of Temperature

MCQ▾

Question

One mole of an ideal gas at an initial temperature of TK does 8 R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is , the final temperature of gas will be

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1501

» Kinetic Theory of Gases » Kinetic Energy and Temperature

MCQ▾

Question

A flask is filled with 15 gm of an ideal gas at 27°C and its temperature is raised to 47°C. The mass of the gas that has to be released to maintain the temperature of the gas in the flask at 52°C and the pressure remaining the same is

Choices

Choice (4) Response

a.

1.5 g

b.

2.5 g

c.

1.0 g

d.

2.0 g

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