# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1511 - 1516 of 2320

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## Question number: 1511

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

### Question

110 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.

70 J

b.

110 J

c.

40 J

d.

150 J

## Question number: 1512

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MCQ▾

### Question

The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures 27 degree Celsius and -113 degree Celsius

### Choices

Choice (4)Response

a.

46%

b.

0.4%

c.

50%

d.

0.75%

## Question number: 1513

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MCQ▾

### Question

The ratio of the radii of the nuclei 13 Al 27 and 52 Te 125 is approximately -

### Choices

Choice (4)Response

a.

13: 52

b.

40: 177

c.

14: 73

d.

6: 10

## Question number: 1514

» Thermodynamics » Laws of Thermodynamics » First Law of Thermodynamics

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MCQ▾

### Question

The first law of thermodynamics is concerned with the conservation of

### Choices

Choice (4)Response

a.

Mass

b.

Energy

c.

Momentum

d.

Temperature

## Question number: 1515

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MCQ▾

### Question

The energy released per fission of U 235 is about 200 MeV. A reactor using U 235 as fuel is producing 1000 kilowatt power. The number of U 235 nuclei undergoing fission per sec is, approximately-

### Choices

Choice (4)Response

a.

10 6

b.

3 × l0 16

c.

2 × 10 8

d.

931

## Passage

In a living organism, the quantity of C 14 is the same as in the atmosphere. But in organisms which are dead, no exchange takes place with the atmosphere and by measuring the decay rate of 14 C in the old bones or wood, the time taken for the activity to reduce to this level can be calculated. This gives the age of the wood or bone.

Given: T 1/2 for 14 C is 5370 years and the ratio of is 1.3 ⨯ 10 -12.

## Question number: 1516 (1 of 3 Based on Passage) Show Passage

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MCQ▾

### Question

The decay rate in another piece is found to be 0.30 Bq per gm then we can conclude,

### Choices

Choice (4)Response

a.

he sample is very recent

b.

There is a statistical error

c.

The observed decay is not that of 14 C alone

d.

All a. , b. and c. are correct

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