NEET Physics: Questions 982 - 986 of 2098

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Question number: 982

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

Assertion-Reason▾

Assertion (Ꭺ)

The mirrors used in search lights are parabolic and not concave spherical.

Reason (Ꭱ)

In a concave spherical mirror the image formed is always virtual.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Question number: 983

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

MCQ▾

Question

The refractive indices of material of a prism for blue and red colors are 1.532 and 1.514 respectively. Calculate angular dispersion produced by the prism if angle of prism is 8°.

Choices

Choice (4) Response

a.

0.133°

b.

0.111°

c.

0.122°

d.

0.144°

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.

3

d.

2

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

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