Communication System-Propagation of Electromagnetic Waves in the Atmosphere (NEET Physics): Questions 6 - 8 of 8

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Question number: 6

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

Assertion-Reason▾

Assertion (Ꭺ)

Television signals are not received through sky-wave propagation.

Reason (Ꭱ)

The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 7

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

MCQ▾

Question

While tuning in a certain broadcast station with a receiver, we are actually,

Choices

Choice (4) Response

a.

Varying the local oscillator frequency

b.

Tuning the antenna

c.

Varying the frequency of the radio signal to be picked

d.

Question does not provide sufficient data or is vague

Question number: 8

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

Assertion-Reason▾

Assertion (Ꭺ)

The electromagnetic waves of shorter wavelength can travel longer distances on earth’s surface than those of longer wavelengths.

Reason (Ꭱ)

Shorter the wavelength, the larger is the velocity of wave propagation.

Choices

Choice (4) Response

a.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Ꭺ is true but Ꭱ is false

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