NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 984 - 988 of 2142

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Question number: 984

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

In an EM wave the amplitude of electric field is 10 V/m. The frequency of wave is 5 x 10 4 Hz. The wave is propagating along Z-axis. Then the average energy density of magnetic field is-

Choices

Choice (4) Response

a.

2 x 10 -8 J/m 3

b.

2.21 x 10 -8 J/m 3

c.

2.21 x 10 -10 J/m 3

d.

2 x 10 -10 J/m 3

Question number: 985

» Ray Optics » Deviation and Dispersion of Light by a Prism

MCQ▾

Question

A ray of light is incident at an angle of 60° on one face of a prism which has an angle of 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. Calculate the refractive index of the material of the prism,

Choices

Choice (4) Response

a.

2

b.

1

c.

d.

Question number: 986

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

Which of the following pairs of space and time varying E and B fields would generate a plane electromagnetic wave travelling in (-Z) direction?

Choices

Choice (4) Response

a.

E X, B Z

b.

E Y, B X

c.

E Z, B Y

d.

E X, B Y

Question number: 987

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

MCQ▾

Question

Two mirrors are inclined at an angle of 50°. Then what is the number of images formed for an object placed in between the mirrors?

Choices

Choice (4) Response

a.

7

b.

1

c.

3

d.

6

Question number: 988

» Ray Optics » Snell's Law

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

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.

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