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# Test: Electromagnetic Waves (CBSE Level With Solutions)

## 30 Questions MCQ Test Exclusive Video Lectures of Class 12 Physics by Experts | Test: Electromagnetic Waves (CBSE Level With Solutions)

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This mock test of Test: Electromagnetic Waves (CBSE Level With Solutions) for Class 12 helps you for every Class 12 entrance exam. This contains 30 Multiple Choice Questions for Class 12 Test: Electromagnetic Waves (CBSE Level With Solutions) (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Electromagnetic Waves (CBSE Level With Solutions) quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Electromagnetic Waves (CBSE Level With Solutions) exercise for a better result in the exam. You can find other Test: Electromagnetic Waves (CBSE Level With Solutions) extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
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QUESTION: 3

### Plane electromagnetic wave travels in vacuum along z-direction. If the frequency of the wave is 30 MHz, its wavelength is

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QUESTION: 4

Electromagnetic waves propagate

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QUESTION: 5

State the part of the electromagnetic spectrum to which 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift)..Belongs

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QUESTION: 6

Long distance radio broadcasts use short-wave bands because

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QUESTION: 7

Which of these mechanisms can be used to produce electromagnetic waves?

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QUESTION: 8

Microwaves have a frequency of about

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QUESTION: 9

The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B0= 510 nT. Amplitude of the electric field part of the wave is

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QUESTION: 10

It is necessary to use satellites for long distance TV transmission because

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QUESTION: 11

The intensity of a plane electromagnetic wave is proportional to

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QUESTION: 12

According to Maxwell’s equations

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QUESTION: 13

The direction of propagation of an electromagnetic plane wave is

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QUESTION: 14

Infrared waves are produced by

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QUESTION: 15

Use the formula λm T = 0.29 cmK to obtain the characteristic temperature range for λm=5×10-7m

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QUESTION: 16

Optical and radio telescopes are built on the ground, but X-ray Astronomy is possible only from satellites orbiting the earth because

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QUESTION: 17

Plane electromagnetic waves are

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QUESTION: 18

Without the concept of displacement current it is not possible to correctly apply Ampere’s law on a path parallel to the plates of parallel plate capacitor C in

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QUESTION: 19

Visible range of electromagnetic spectrum is

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QUESTION: 20

State the part of the electromagnetic spectrum to which 21 cm (wavelength emitted by atomic hydrogen in interstellar space).belongs

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QUESTION: 21

Velocity of plane electromagnetic waves in vacuum equals

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QUESTION: 22

Tanning of the skin in sunlight is due to

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QUESTION: 23

A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. Frequency of the electromagnetic waves produced by the oscillator is

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QUESTION: 24

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?

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QUESTION: 25

Do EM waves need a medium to travel through?

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QUESTION: 26

Comparing X-rays and Gamma rays

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QUESTION: 27

7.5 MHz to 12 MHz band corresponds to wavelength band of

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QUESTION: 28

The speed of plane electromagnetic waves is maximum in

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QUESTION: 29

When white light is split into its component colors by a prism

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QUESTION: 30

Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

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