Question Pool Electromagnetic Waves

# Electromagnetic Waves - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Physics Electromagnetic Waves

Qn 1.

The time varying electric and magnetic field will produce an electromagnetic wave. The electric field of an electromagnetic wave is given by Ex = Eo Sin (kz - ωt)

1. Write the direction of propagation of electro magnetic wave.

2. State True or false.

In an electromagnetic wave electric and magnetic vectors are perpendicular to each other.

(ii) Magnitude of electric and magnetic vectors are same.

1. The magnetic field of a radio wave can be represented as      B= 40 Sin (0.4x103+2.5x10 10 t). What is the amplitude of electric field vector?

1. Z- direction

2. (i) True

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Qn 2.

Maxwell introduced the concept of displacement current which enables to explain the continuous current flow through a circuit.

1. Explain the concept of displacement current

2. Give its SI Unit

3. List out the significance of displacement current.

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Qn 3.

Electromagnetic spectrum is an orderly arrangement of electromagnetic waves according to their wave length/frequency.

1. (a)Arrange the following electromagnetic waves in the ascending order of frequency.

Gamma rags, X-rays, Visible ray, infra red.

(b)

1. Match the following

 A B C a) Infra red Acceleration of charged particles in a wire Cancer Treatment b) X-rays Hot bodies Water Purifier c) Radio waves Transission of electrons between different energy levels Radar d )Ultraviolet Fracture of bones Remote control Magnetron Cellular Phone
1. Infra red, visible rays, x-rays, gamma rays (1)

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Qn 4.

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

(a)microwave, infrared, ultraviolet, gamma rays                       (b)infrared, microwave, ultraviolet, gamma rays

(c)gama rays, ultraviolet, infrared, microwaves                        (d)microwaves, gamma rays, infrared, ultraviolet

(a)microwave, infrared, ultraviolet, gamma

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Qn 5.

Radio waves do not penetrate in the band of

(a) ionosphere                                        (b) mesosphere

(b)troposphere                                        (d) stratosphere

(a) ionosphere

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Qn 6.

What is the cause of “Green house effect”?

(a) Infraredrays                         (b) Ultraviolet rays

(a)

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Qn 7.

Radio waves do not penetrate in the band of

(a) ionosphere                                   (b) mesosphere

(c)troposphere                                   (d) stratosphere

(a)

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Qn 8.

Which of the following electromagnetic waves ha longest wavelength?

(a)uv-rays                               (b)Visible light

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Qn 9.

According to Maxwell’s equation the velocity of light in any medium is expressed as

(a)                           (b)

(c)                            (d)

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Qn 10.

The electromagnetic waves do not transport

(a) energy                                          (b) charge

(c) momentum                                    (d) information

(b) charge

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Qn 11.

If   and  are the electirc and magnetic field vectors of e.m.waves then the direction of propagation of e.m. wave is along the direction of

(a)                                                (b

(c)                                        (d) None of these

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Qn 12.

Which of the following type of radiations are radiated by an oscillating electric charge?

(a) Electric                                                       (b) Magnetic

(c) Thermoelectric                                            (d) Electromagnetic

(d)

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Qn 13.

Electromagnetic spectrum is an orderly arrangement of electromagnetic waves according to their wave length/frequency.

a)Arrange the following electromagnetic waves in the ascending order of frequency.

Gamma rags, X-rays, Visible ray, infra red.

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Qn 14.

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Qn 15.

Maxwell introduced the concept of displacement current which enables to explain the continuous current flow through a circuit.

1. Explain the concept of displacement current

2. Give its SI Unit

3. List out the significance of displacement current.

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Qn 16.

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Qn 17.

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Qn 18.

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Qn 26.

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Qn 27.

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Qn 28.