Electromagnet Spectrum – Online MCQs – Physics 10th

1. The direction of wave motion of electromagnetic waves is:

perpendicular to magnetic field

perpendicular to electric field

parallel to magnetic and magnetic fields

perpendicular to electric and magnetic fields

2. The group containing only electromagnetic waves is:

Light waves, Radio waves, Sound waves

Radio waves, Sound waves, Microwaves

Light waves, radio waves, Microwaves

Light waves, Sound waves, Microwaves

3. Which of these electromagnetic waves has a high frequency?

X-rays

Gamma rays

None of these

Both of these

4. This colour has a maximum speed in the glass prism, with the slightest deviation.

Violet

Green

Red

Blue

5. The velocity of light in a diamond is: (whereas the refractive index of a diamond with respect to vacuum is 2.5)

1.2 x 10⁸ m/s

2.5 x 10⁸ m/s

1.2 x 10¹⁰ m/s

5 x 10⁸ m/s

6. Which statement is TRUE about the red light?

It penetrates through rain mist, and fog

It can travel the longest distance

All of them

The air molecules least scatter it

7. The type of waves that are used in the television remote controllers:

Radio waves

Infrared waves

Visible light

Ultraviolet waves

8. The electromagnetic rays used in radiotherapy to destroy cancer cells are:

infrared rays

visible rays

ultraviolet rays

x-rays

9. The colour that is least deviated by a prism:

Violet ray

Yellow ray

Red ray

Green ray

10. They are produced when the nuclei of unstable atoms decay into a stable nucleus or lose energy.

Microwave

Infrared

Ultraviolet

Gamma rays

11. It has the longest wavelength in the electromagnetic spectrum.

Radio waves

X-rays

Microwaves

Gamma rays

12. Which of the following statement is false for the properties of electromagnetic waves?

These waves do not require any material medium for propagation.

Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.

Both electric and magnetic field, vectors are parallel to each other and perpendicular to the direction of propagation of the wave.

The energy in electromagnetic waves is divided equally between electric and magnetic field vectors.

13. Stars are natural transmitters of:

microwaves

x-rays

radio waves

ultraviolet rays

14. The human body also gives out:

microwaves

radio waves

x-rays

infrared radiations

15. The type of electromagnetic wave used in security scanners at night is:

X-ray

infra-red

microwaves

radio waves

16. It has the highest wavelength of all the colours.

Violet

Yellow

Red

Orange

17. They are highly penetrating that can pass through flesh but not bones.

None of them

The long-wavelength x-rays

The low frequency x-rays

both of these

18. This colour has minimum speed, which with most deviation.

Violet

Red

Blue

Green

19. The white light consists of:

5 colours

6 colours

8 colours

7 colours

20. Choose the electromagnetic wave that is the most dangerous to humans.

Ultraviolet rays

Microwaves

Infrared

Radio waves

Online MCQs Test | Unit 12 : Electromagnet Spectrum | Physics Class 10th | Sindh Board Science Group