# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 989 - 993 of 2184

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## Question number: 989

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MCQ▾

### Question

A light beam is travelling from Region I to Region IV (Refer Figure). The refractive index in Regions I, II, III and IV are respectively. The angle of incidence θ for which the beam just misses entering Region IV is, Beam Travelling from Region I to Region IV In figure beam is travelling from region I to region IV. n0, n02, n06 andn08 are the refractive indexes of region I, II, III and IV respectively.

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 990

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MCQ▾

### Question

convex mirror is used to form the image of an object. Which of the following statements is wrong?

### Choices

Choice (4) Response

a.

The image is erect

b.

The image is diminished in size

c.

The image is real

d.

The image lies between the pole and the focus

## Question number: 991

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MCQ▾

### Question

Light wave is travelling along + y-direction. If the corresponding E vector at that time is along + x-direction, B vector must be directed along.

### Choices

Choice (4) Response

a.

+ Z axis

b.

- Z axis

c.

X-axis

d.

Y-axis

## Question number: 992

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MCQ▾

### Question

Choose the wrong statement for E. M. wave.

### Choices

Choice (4) Response

a.

They are transverse

b.

They travel in vacuum with the speed of light

c.

They are produced by accelerated charges

d.

They travel with same speed in all medium

## Question number: 993

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MCQ▾

### Question

An electromagnetic wave of frequency ν = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ϵ r = 4.0. Then the wrong statements are

(1) Wavelength is doubled and the frequency remains unchanged

(2) Wavelength is doubled and frequency becomes half

(3) Wavelength and frequency both remain unchanged

(4) Wavelength is halved and frequency remains unchanged

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

Codes:

### Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1,2 and 3 are correct

d.

1 and 2 are correct