EM Waves Uses and Effects

1.

Multiple Choice

2 mins

1 pt

In radio communication, sound waves are fed to the radio station microphone and heard through a radio. What do you consider a radio station?

Receiver

Transmitter- Receiver

Transmitter

Radio communication

2.

Multiple Choice

2 mins

1 pt

What is the function of the loudspeaker in radio communication?

converts electrical signals to sound waves

converts sound waves to electrical signals

increases the intensity of the sound

selects the frequency received

3.

Multiple Choice

2 mins

1 pt

In radio communication, for sound to be transmitted and received, the following processes are involved. Arrange the processes in correct order.

I. Amplification

II. Modulation

III. Reception

IV. Demodulation

I, II, III, IV

II, I, IV, III

III, I, II, IV

4.

Multiple Choice

2 mins

1 pt

Why is it that in order for the sound waves to be transmitted and received, they should combine with the carrier waves or radio waves?

Because radio waves can travel in space

Because radio waves can travel over a long distance in a short time.

Because sound signals cannot travel over a long distance in a short time

Because sound signals can travel over a long distance in a long time.

5.

Multiple Choice

2 mins

1 pt

What is the function of a broadcast antenna?

it allows a radio transmitter to send energy into space

It allows a receiver to pick up energy from space

It combines the electrical signals and the carrier waves

It separates the electrical signals from the carrier waves.

6.

Multiple Choice

2 mins

1 pt

Which of the following are the components of a transmitter?

microphone, loudspeaker, oscillator

amplifier, demodulator, receiver antenna

modulator, broadcast antenna, microphone

demodulator, loudspeaker, oscillator

7.

Multiple Choice

2 mins

1 pt

How does amplitude modulation differ from frequency modulation?

The amplitude of the carrier wave is varied according to he intensity(loudness)and frequency of the source sound wave.

The amplitude of the carrier wave is fixed and the frequency is varied according to intensity and frequency of the source sound wave.

The frequency and amplitude of the carrier wave is fixed.

The frequency of the carrier wave is varied according to wavelength and amplitude.

8.

Multiple Choice

1 min

1 pt

Which type of EM waves is commonly used in point to point communication system on Earth's surface and satellite communication?

Infrared

visible light

microwave

ultraviolet

9.

Multiple Choice

1 min

1 pt

Which of the following statements differentiate ionizing radiation from non-ionizing radiation?

Non-ionizing radiation has insufficient energy to remove electrons from atoms, but ionizing radiation does not.

Non-ionizing radiation occurs naturally and ionizing radiation is only artificially made.

Ionizing radiation has sufficient energy to remove electrons from an atom but non-ionizing radiation does not.

Ionizing radiation occurs naturally and non-ionizing radiation is only artificially made.

10.

Multiple Choice

1 min

1 pt

Which of the following is an example of non-ionizing radiation?

Alpha particles

Infrared

Gamma rays

X-rays

11.

Multiple Choice

1 min

1 pt

Which of the following is not a potential effect of exposure to high doses of radiation?

Cellular damage

Cancer

Reddening of the skin

Sunburn

12.

Multiple Choice

1 min

1 pt

Which of the following statements is TRUE?

Exposure to high-energy radiation can result in genetic mutation.

Exposure to high energy radiation can cause tanning of the skin.

Exposure to low energy radiation can cause leukemia.

Exposure to low energy radiation can destroy microorganisms and pests.

13.

Multiple Choice

1 min

1 pt

Arrange the types of ionizing radiation from least to most penetrating.

Alpha, Beta, X-rays, Gamma

Beta, X-rays, Gamma, Alpha

X-rays, Beta, Alpha, Gamma

Gamma, X-rays, Beta, Alpha

14.

Multiple Choice

1 min

1 pt

Which of the following conditions may result in overexposure to UV rays?

Skin damage

Leukemia

Vomiting

Nausea

15.

Multiple Choice

1 min

1 pt

Which gas that is present in the air we breathe can increase the risk of lung cancer when inhaled over time?

Hydrogen

Nitrogen

Oxygen

Radon

16.

Multiple Choice

1 min

1 pt

Which of these is a common symptom of radiation sickness?

Cancer

Erythema

Sunburn

Leukemia

17.

Multiple Choice

1 min

1 pt

Which type of radiation is the least penetrating?

Alpha

Beta

Gamma

X-rays

18.

Multiple Choice

1 min

1 pt

Which of the following tissue is the most vulnerable to radiation damage?

tissue that receives the largest dose

tissue with cells that divide quickly

tissue that is located in the abdominal region

tissue with cells that no longer divide

19.

Multiple Choice

1 min

1 pt

Which of the following Ionizing radiation can be easily stopped by matter?

Alpha

Beta

Gamma

X-ryay

20.

Multiple Choice

1 min

1 pt

Which of the following are the uses of visible rays?

I. fiber optics II. Laser surgery III. Artificial lights IV. signboards

I and II only

I and III only

III and IV only

I, II, III and IV

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