# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1209 - 1212 of 2184

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## Question number: 1209

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MCQ▾

### Question

Interference fringes were produced in Young’s double slit experiment using light of wave length 5000 Å. When a film of material 2.5 × 10 -3 cm thick was placed over one of die slits, the fringe pattern shifted by a distance equal to 20 fringe width. The refractive index of the material of die film cannot be

(1) 1.25 (2) 1.33

(3) 1.5 (4) 1.4

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

Codes:

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

2 and 4 are correct

## Question number: 1210

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MCQ▾

### Question

An incompressible liquid flows through a horizontal tube as shown in trite following fig. Then the velocity v of the fluid is Flow of Horizontal Fluid - the Velocity v of the Fluid In above figure we show that in starting fluid flow with 3 m/s and then it divided in two way with velocity of 1.5 m/s

### Choices

Choice (4) Response

a.

2.25 m/s

b.

1.0 m/s

c.

3.0 m/s

d.

1.5 m/s

## Question number: 1211

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MCQ▾

### Question

A parallel beam of monochromatic light is incident on a narrow rectangular slit of width 1mm. When the diffraction pattern is seen on a screen placed at a distance of 2m. The width of principal maxima is found to be 2.5 mm. The wave length of light is-

### Choices

Choice (4) Response

a.

6250 nm

b.

6000 nm

c.

5890 nm

d.

6200 nm

## Question number: 1212

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MCQ▾

### Question

If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr’s first postulate, the kinetic energy of the electron in C. G. S system is equal to.

### Choices

Choice (4) Response

a.

b.

c.

d.