# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1340 - 1345 of 2320

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## Question number: 1340

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MCQ▾

### Question

What will be the angle of diffraction for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit width 0.55 mm?

### Choices

Choice (4)Response

a.

b.

c.

d.

## Passage

There is a small mercury drop of radius 4.0 mm. A surface P of area 1.0 mm 2 is placed at the top of the drop. Atmospheric pressure = 10 5 Pa. Surface tension of mercury = 0.465 N/m. Gravity effect is negligible.

## Question number: 1341 (1 of 2 Based on Passage) Show Passage

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MCQ▾

### Question

The force exerted by mercury drop on the surface P is

### Choices

Choice (4)Response

a.

0.10023 N

b.

0.1 N

c.

1.0023 N

d.

0.00023 N

## Question number: 1342 (2 of 2 Based on Passage) Show Passage

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MCQ▾

### Question

The force exerted by air on surface P is

### Choices

Choice (4)Response

a.

1.0023 N

b.

0.1 N

c.

1.0N

d.

10 5 N

## Question number: 1343

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MCQ▾

### Question

A candle of diameter d is floating on a liquid in a cylindrical container of diameter D (D > > d). If it is burning at the rate of 2 cm/hour then the top of the candle will,

### Choices

Choice (4)Response

a.

Remain at the same height

b.

Go up the rate of 1 cm/hour

c.

Fall at the rate of 1 cm/hour

d.

Fall at the rate of 2 cm/hour

## Question number: 1344

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MCQ▾

### Question

The value of the kinetic energy divided by the total energy of an electron in a Bohr orbit is

### Choices

Choice (4)Response

a.

2

b.

-1

c.

0.5

d.

All of the above

## Question number: 1345

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MCQ▾

### Question

The Young’s modulus of steel is 2 × 10 11 N/m 2 and its coefficient of linear expansion is 1.1 × 10 -5 per deg. The pressure to be applied to the ends of a steel cylinder to keep its length constant on raising its temperature by 100°C, will be -

### Choices

Choice (4)Response

a.

2.2 × 10 8 N/m 2

b.

5.5 × 10 4 N/m 2

c.

1.8 × 10 6 N/m 2

d.

2.0 × 10 11 N/m 2

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