Electromagnetic Waves (NEET Physics): Questions 10 - 15 of 31

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Question number: 10

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If TV signals are to b received by the ground waves with in a range D, the height of the TV tower should be, (R is the radius of earth)

Choices

Choice (4) Response

a.

2d2R

b.

d22R2

c.

2dR

d.

d2R

Question number: 11

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

Which of the following waves have minimum frequency?

Choices

Choice (4) Response

a.

Audible waves

b.

Radio waves

c.

Microwaves

d.

Ultrasonic waves

Question number: 12

» Electromagnetic Waves » Electromagnetic Spectrum » X-Rays

MCQ▾

Question

If λ = 10 Å, then it correspond to

Choices

Choice (4) Response

a.

X-rays

b.

Infrared waves

c.

Microwaves

d.

Ultraviolet waves

Question number: 13

» Electromagnetic Waves » Electromagnetic Waves & Characteristics

MCQ▾

Question

The intensity of light from a source is 500πWm2 . Find the amplitude of electric field in this-wave-

Choices

Choice (4) Response

a.

23×10NC

b.

32×102NC

c.

3×102NC

d.

23×102NC

Question number: 14

» Electromagnetic Waves » Electromagnetic Spectrum » Ultraviolet

Assertion-Reason▾

Assertion (Ꭺ)

Ultraviolet radiations are of higher frequency waves and are dangerous to human being.

Reason (Ꭱ)

Ultraviolet radiations are absorbed by the atmosphere.

Choices

Choice (4) Response

a.

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

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 15

» Electromagnetic Waves » Applications of Electromagnetic Waves

MCQ▾

Question

If E and B be the electric and magnetic field of E. M. wave then the direction of propagation of E. M. wave is along the direction.

Choices

Choice (4) Response

a.

B

b.

E×B

c.

E

d.

B×E

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