Communication - CBSE STD 12 Science Physics Questions

202

Questions

1

Question groups

5

Question types

01

M.C.Q (1 Marks)

202 Q→

Sample Questions

Communication questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark

A photodetector is made from a semiconductor In$ 0.53$ $Ga$ $0.47$ As with $E_g = 0.73 \,eV$. What is the maximum wavelength, which it can detect.........$nm$

A
$1000$
✓
$1703$
C
$500$
D
$173$

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark

A transmitter supplies $9 \,kW$ to the aerial when unmodulated. The power radiated when modulated to $40\%$ is........$kW$

A
$5$
✓
$9.72$
C
$10 $
D
$12$

Answer: B.

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Q 3M.C.Q (1 Marks)1 Mark

The total power content of an $AM$ wave is $1500\, W.$ For $100\%$ modulation, the power transmitted by the carrier is........$W$

A
$500$
B
$700$
C
$750$
✓
$1000$

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark

The total power content of an $AM$ wave is $ 900\, W$. For $100\%$ modulation, the power transmitted by each side band is......$W$

A
$50 $
B
$100$
✓
$150$
D
$200$

Answer: C.

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Q 5M.C.Q (1 Marks)1 Mark

The modulation index of an $FM$ carrier having a carrier swing of $200\, kHz$ and a modulating signal $10\, kHz$ is

A
$5$
✓
$10$
C
$20$
D
$25$

Answer: B.

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