NEET Physics: Questions 1072 - 1076 of 2099

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Question number: 1072

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

A wave is propagating in a medium of dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is

Choices

Choice (4) Response
a.

1883 Ω

b.

376.6Ω

c.

3776 Ω

d.

Question number: 1073

» Ray Optics » Total Internal Reflection

MCQ▾

Question

Mirages are observed in deserts due to,

Choices

Choice (4) Response
a.

Total internal reflection of light

b.

Interference of light

c.

Dispersion of light

d.

Double refraction of light

Question number: 1074

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

Which of the following statements are true?

(1) Photographic plates are sensitive to ultraviolet rays.

(2) Photographic plates can be made sensitive to infrared rays.

(3) Infrared rays are emitted by hot objects.

(4) Infrared photon has more energy than the photon of visible light.

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, 2 and 3 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 1075

» Electromagnetic Induction & Alternating Currents » LCR Series Circuit

MCQ▾

Question

In a series LCR circuit, resistance R = 10 Ω and the impedance Z = 20 Ω. The phase difference between the current and the voltage is,

Choices

Choice (4) Response
a.

45°

b.

30°

c.

60°

d.

90°

Question number: 1076

» Ray Optics » Magnification

MCQ▾

Question

A lens is placed between a source of light and a wall. It forms images of area A 1 and A 2 on the wall for its two different positions. The area of the source of light is,

Choices

Choice (4) Response
a.

A1A2

b.

[A1+A22]2

c.

[1A1+1A2]1

d.

A1+A22

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