Electromagnet Spectrum – Online MCQs – Physics 10th

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

perpendicular to magnetic field

perpendicular to electric field

perpendicular to electric and magnetic fields

parallel to magnetic and magnetic fields

2. Light year is a unit of:

None of these

time

speed

distance

3. All electromagnetic waves travel through space or vacuum at the same speed of:

300000 km/s

both of these

3 x 10⁸ m/s

None of these

4. The ultra-high frequency band of radio waves in the electromagnetic wave is used as in:

Both television and cellular phone

television

cellular phone communication

commercial FM radio

5. Electromagnetic waves are:

longitudinal and mechanical waves

transverse waves

mechanical waves

longitudinal waves

6. The human body also gives out:

radio waves

microwaves

infrared radiations

x-rays

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

radio waves

microwaves

X-ray

infra-red

8. Vibrating atoms in a hot, glowing bulb filament emit:

radio waves and visible light

infrared and visible light

microwave and visible light

ultraviolet and visible light

9. In a vacuum, all electromagnetic spectrum components have the same:

energy

velocity

wavelength

frequency

10. The optical phenomenon in which the splitting of white light into seven distinct colours occur is called:

reflection

dispersion

refraction

diffraction

11. 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

5 x 10⁸ m/s

1.2 x 10¹⁰ m/s

12. Which statement is TRUE about the red light?

All of them

It can travel the longest distance

The air molecules least scatter it

It penetrates through rain mist, and fog

13. The waves used by artificial satellites for communication are:

infrared waves

radio waves

microwaves

x-rays

14. Which of the following has a minimum wavelength?

Infrared rays

Microwave

Blue light

Gamma rays

15. It is a cancer treatment that uses controlled doses of high-frequency x-rays to kill cancerous cells and shrink tumours.

x-rays

Radiation Therapy

Computed Tomography (CT) scan

Industrial radiography

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

Orange

Yellow

Red

Violet

17. Which one of the following has the shortest wavelength?

Microwaves

Gamma rays

Infrared rays

Ultraviolet rays

18. The waves that have maximum penetrating power to treat tumours are:

microwaves

gamma-rays

ultraviolet radiation

radio waves

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

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

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

These waves do not require any material medium for propagation.

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

20. What are the two colours that emerge from Prism’s two extreme ends?

Blue and Green

Violet and Red

Yellow and Orange

Red and Orange

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