Electromagnetic Waves Test

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Electromagnetic Waves Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

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

A
Television signals are attenuated by ionosphere

B
Satellites transmit the signals all over the earth

C
Television signals are absorbed by ionosphere

D
Television signals are not properly reflected by the ionosphere

Solution

Television signals are of high frequencies and high energies. Thus, these signals are not reflected by the ionosphere hence satellites are necessary for television transmission.
Question 2
1 / -0

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

A
Atmosphere reflects X-rays away from earth

B
Atmosphere absorbs X-rays, while visible and radio waves can penetrate it.

C
Satellites orbiting the earth make use of interstellar effects

D
Atmosphere reflects X-rays horizontally so they don’t reach the earth

Solution

Optical and radio waves can penetrate the atmosphere whereas x- rays, are of very short wavelength and hence absorbed by the atmosphere. This is the reason why we can work with optical and radio telescopes on earth's surface, but x-rays astronomical telescopes must be used on the satellite orbiting above the earth's atmosphere.
Question 3
1 / -0

The small ozone layer on top of the stratosphere is crucial for human survival because

A
None of these

B
It absorbs ultraviolet radiations from the sun and prevents it from reaching the earth’s surface and causing damage to life.

C
Layer on top of the stratosphere is crucial as it supplies oxygen to atmosphere

D
It prevents water molecules from escaping into space

Solution

Ozone layer absorbs UV rays
Question 4
1 / -0

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

A
Higher as earth has poor reflectivity

B
Higher as the heating is better

C
Lower because the Greenhouse effect of the atmosphere would be absent

D
None of these

Solution

Gases like, carbon dioxide, methane etc. present in atmosphere traps the heat because of green house effect and keeps the surface of earth warm.
Question 5
1 / -0

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?

A
None of these

B
The clouds produced by global nuclear war would perhaps cover substantial parts of the sky preventing solar light from reaching many parts of the globe

C
Nuclear reactions absorb atmospheric heat causing cooling

D
Nuclear reactions absorb visible light causing dark days/nights

Solution

Nuclear winter is the severe and prolonged global climatic cooling effect hypothesized to occur after widespread firestorms following a nuclear war. The hypothesis is based on the fact that such fires can inject soot into the stratosphere, where it can block some direct sunlight from reaching the surface of the Earth. It is speculated that the resulting cooling would lead to widespread crop failure and famine.
Question 6
1 / -0

Do EM waves need a medium to travel through?

A
Yes

B
Ether is required

C
None of these

D
No

Solution

Oscillatory electric and magnetic field produces EM wave. As electric and magnetic field can propagate in vacuum, EM wave do not necessarily require medium.
Question 7
1 / -0

Electromagnetic radiation

A
is pure waves

B
is only particles

C
is neither a wave nor a particle but pure energy

D
has both a wave and particle nature

Solution

It has a dual nature. It shows wave nature as well as particle nature (photon).
Question 8
1 / -0

High intensities of UV light

A
is useful to good health

B
kills dangerous bacteria and therefore good

C
are hazardous to the eyes

D
are low in energy

Solution

UV rays has harmful effects on humans.
Question 9
1 / -0

Which of these methods is better to reduce effects of ultra violet light?

A
Polycarbonate lens glasses

B
Full coverage eye protection

C
Untreated eyeglasses

D
Plastic lens eyeglasses

Solution

Polycarbonate lenses are up to 10 times more impact-resistant than plastic or glass lenses and they provide 100% protection from the sun's harmful UV rays. They are also lightweight, adding to the comfort of eyeglasses, sunglasses, and sports eye wear.
Question 10
1 / -0

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

A
All of the electromagnetic spectrum

B
You are looking at a part of the electromagnetic spectrum

C
You are not looking at electromagnetic spectrum but at colored light.

D
None of these

Solution

Components of white light (VIBGYOR) falls in visible region of em spectrum.

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Re-Attempt Weekly Quiz Competition

Electromagnetic Waves Test - 9

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Electromagnetic Waves Test - 9

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SHARING IS CARING

Question 1

Television signals are attenuated by ionosphere

Satellites transmit the signals all over the earth

Television signals are absorbed by ionosphere

Television signals are not properly reflected by the ionosphere

Solution

Question 2

Atmosphere reflects X-rays away from earth

Atmosphere absorbs X-rays, while visible and radio waves can penetrate it.

Satellites orbiting the earth make use of interstellar effects

Atmosphere reflects X-rays horizontally so they don’t reach the earth

Solution

Question 3

None of these

It absorbs ultraviolet radiations from the sun and prevents it from reaching the earth’s surface and causing damage to life.

Layer on top of the stratosphere is crucial as it supplies oxygen to atmosphere

It prevents water molecules from escaping into space

Solution

Question 4

Higher as earth has poor reflectivity

Higher as the heating is better

Lower because the Greenhouse effect of the atmosphere would be absent

None of these

Solution

Question 5

None of these

The clouds produced by global nuclear war would perhaps cover substantial parts of the sky preventing solar light from reaching many parts of the globe

Nuclear reactions absorb atmospheric heat causing cooling

Nuclear reactions absorb visible light causing dark days/nights

Solution

Question 6

Yes

Ether is required

None of these

No

Solution

Question 7

is pure waves

is only particles

is neither a wave nor a particle but pure energy

has both a wave and particle nature

Solution

Question 8

is useful to good health

kills dangerous bacteria and therefore good

are hazardous to the eyes

are low in energy

Solution

Question 9

Polycarbonate lens glasses

Full coverage eye protection

Untreated eyeglasses

Plastic lens eyeglasses

Solution

Question 10

All of the electromagnetic spectrum

You are looking at a part of the electromagnetic spectrum

You are not looking at electromagnetic spectrum but at colored light.

None of these

Solution

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