Electromagnetic Waves and Communication System - Maharashtra Board STD 11 Physics Questions - Vidyadip

Question types

Electromagnetic Waves and Communication System question types

152 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

152

Questions

5

Question groups

5

Question types

M.C.Q (1 Marks)

Very Short Answer Type Question

Short Answer Type Question

Answer the following in Brief

Answer the following in Detail

Sample Questions

Electromagnetic Waves and Communication System 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

If a TV telecast is to cover a radius of 640 km, what should be the height of transmitting antenna?

✓
32000 m
B
53000 m
C
42000 m
D
55000 m

Answer: A.

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

The waves used by artificial satellites for communication purposes are

✓
Microwave
B
AM radio waves
C
FM radio waves
D
X-rays

Answer: A.

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

The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to

✓
$h \frac{1}{2}$
B
$h$
C
$h \frac{2}{3}$
D
$h^2$

Answer: A.

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

The direction of $EM$ wave is given by

✓
$\bar{E} \times B$
B
$\bar{E} . B$
C
along $\bar{E}$
D
along $B$

Answer: A.

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

How does the frequency of a beam of ultraviolet light change when it travels from air into glass?

A
depends on the values of p and e
B
increases
C
decreases
✓
remains same

Answer: D.

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Q 6Very Short Answer Type Question1 Mark

Name the most harmful radiation entering the Earth’s atmosphere from the outer space.

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Q 7Very Short Answer Type Question1 Mark

What is meant by amplitude modulation?

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Q 8Very Short Answer Type Question1 Mark

What type of modulation is required for television broadcast?

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Q 9Very Short Answer Type Question1 Mark

What is demodulation?

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Q 10Very Short Answer Type Question1 Mark

By which mechanism heat is lost by hot bodies?

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Q 11Short Answer Type Question2 Marks

Does an ordinary electric lamp emit EM waves?

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Q 12Short Answer Type Question2 Marks

What is meant by bandwidth?

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Q 13Short Answer Type Question2 Marks

What are electric and magnetic fields and what are their sources?

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Q 14Short Answer Type Question2 Marks

What are Lenz’s law, Ampere’s law and Faraday’s law?

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Q 15Short Answer Type Question2 Marks

What is the difference between longitudinal and transverse waves?

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Q 16Answer the following in Brief3 Marks

A transmitting antenna at the top of a tower has a height $32\ m$ and that of the receiving antenna is $50\ m$. What is the maximum distance between them for satisfactory communication in line of sight mode? Given radius of Earth is $6.4 \times 10^6 m$.

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Q 17Answer the following in Brief3 Marks

Height of a TV tower is $600\ m$ at a given place. Calculate its coverage range if the radius of the Earth is $6400\ km.$ What should be the height to get the double coverage area?

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Q 18Answer the following in Brief3 Marks

A TV tower has a height of $200\ m$ . How much population is covered by TV transmission if the average population density around the tower is $1000 / km ^2$ ? (Radius of the Earth $=6.4 \times 10^6 m$ )

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Q 19Answer the following in Brief3 Marks

The amplitude of the magnetic field part of a harmonic $EM$ wave in vacuum is $B0 = 5 \times 10^{-7}\ T.$ What is the amplitude of the electric field part of the wave?

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Q 20Answer the following in Brief3 Marks

In a EM wave the electric field oscillates sinusoidally at a frequency of $2 \times 10^{10}$ What is the wavelength of the wave?

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Q 21Answer the following in Detail4 Marks

How are EM waves produced?

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Q 22Answer the following in Detail4 Marks

What are radio waves? Give its two uses.

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Q 23Answer the following in Detail4 Marks

State advantages and disadvantages of amplitude modulation.

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Q 24Answer the following in Detail4 Marks

Explain the different types of modulation.

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Q 25Answer the following in Detail4 Marks

Explain the role of modulation.

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