Electromagnetic Spectrum Questions and Answers

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Electromagnetic Spectrum Questions and Answers. We covered all the Electromagnetic Spectrum Questions and Answers MCQ in this post so that you can practice well for the exam.

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Electromagnetic Spectrum MCQ for School Students

Microwaves are often used in

1. radar

2. telemetry

3. microwave ovens

4. all of these

Option 4 – all of these

The waves (or radiations) which are used to transmit telephone conversations are

1. Radiowaves

2. Microwaves

3. Infrared waves

4. Ultra violet waves

Option 3 – Infrared waves

The waves (or radiations) which are utilised by satellite communications, are

1. microwaves

2. radiowaves

3. ultraviolet waves

4. visible light

Option 1 – microwaves

The electromagnetic waves produced by the electromagnetic oscillators of low frequency, are

1. microwaves

2. radiowaves

3. ultraviolet waves

4. gamma rays

Option 2 – radiowaves

The electromagnetic radiations which can travel long distances carrying messages, are

1. radio waves

2. micro waves

3. ultraviolet waves

4. visible light

Option 1 – radiowaves

The electromagnetic radiations which are also received from extra terrestrial sources are

1. Micro radiations

2. IR radiations

3. UV radiations

4. Radiowaves

Option 4 – radiowaves

The mapping of the radio emissions from extra terrestrial sources is known as

1. physiotherapy

2. radiography

3. radio-astronomy

4. radiotherapy

Option 3 – radio-astronomy

Which of the following provides information about the universe?

1. Radio astronomy

2. Radiography.

3. Radiotherapy

4. Physiotherapy

Option 1 – Radio astronomy

The region of electromagnetic spectrum which is familier to us, is

1. Visible spectrum

2. IR spectrum

3.Microwaves

4. UV spectrum

Option 1 – Visible spectrum

The spectrum which is emitted by all known sources of light, is

1. IR spectrum

2. UV spectrum

3. Visible spectrum

4. Radiowaves

Option 3 – Visible spectrum

The spectrum which is emitted when the excited valence electrons in atoms jump back to their normal states, is

1. IR spectrum

2. UV spectrum

3. Visible spectrum

4. Micro waves

Option 3 – Visible spectrum

A characteristic of the atoms of the substance, is

1. the colour of light emitted by it

2. the energy of light emitted by it

3. the power of light emitted by it

4. None of these

Option 3 – the colour of light emitted by it

The information about the composition of the matter present in the Sun and the distant stars is given by the

1. heat emitted by them

2. colour of light emitted by them

3. energy emitted by them

4. None of these

Option 2 – colour of light emitted by them

The spectrum emitted by molecules when they change their states of rotational or vibrational motion, is

1. Visible spectrum

2. UV spectrum

3. IR spectrum

4. X-rays

Option 1 – Visible spectrum

The heat from all bodies travel in the form of

1. IR radiations

2. UV radiations

3. Radio waves

4. Microwaves

Option 1 – IR radiations

The sources of IR radiations, are

1. all known sources of light

2. all hot bodies

3. all cold bodies

4. none of these

Option 2 – all hot bodies

The devices with which the IR radiations can be detected, are

1. Thermometers

2. Thermopiles

3. Bolometers

4. All of these

Option 4 – All of these

The devices which are ……. are used to detect IR radiations are

1. sensitive to heat

2. sensitive to eye

3. senstive to skin

4. sensitive to ears

Option 1 – sensitive to heat

The devices which are sensitive to heat are

1. thermometers

2. thermopiles

3. bolometers

4. all of these

Option 4 – all of these

The IR radiations are used in

1. physio-therapy

2. taking photographs of objects in darkness

3. curing cancer diseases

4. (1) and (2)

Option 4 – (1) and (2)

When a ray of sun light is refracted through a prism, the emergent ray produces a sequences of colours called a visible spectrum. This phe nomenon is called as

1. reflection of light

2. deflection of light

3. analysis of light

4. scattering of light

Option 3 – analysis of light

A group of wavelengths or frequencies is called a

1. spectrum

2. colour hand

3. colour garland

4. None of these

Option 1 – spectrum

Infrared radiations are

1. visible radiations

2. heat radiations

3. cold radiations

4. None of these

Option 2 – heat radiations

Infrared radiations are produced by

1. electric heater

2. hot soldering iron

3. hot clothes iron

4. all of these

Option 4 – all of these

The glass which absorb infrared radiations is

1. ordinary soda glass

2. rock salt

3. plint glass

4. pyrex glass

Option 1 – ordinary soda glass

The prisms made of ……. are used to observe IR radiations

1. pyrex glass

2. ordinary soda glass

3. plint glass

4. rock salt

Option 2 – ordinary soda glass

The source of IR radiations is

1. ice

2. hot clothes iron

3. cold soldering iron

4. boiling water

Option 2 – hot clothes iron

All types of radiations such as IR, visible, UV radiations together constitute

1. spectrum

2. visible spectrum

3. electro magnetic spectrum

4. None of these

Option 3 – electro magnetic spectrum

Brief exposure to ultraviolet radiations causes

1. cancer

2. common sunburn

3. tubercullosis

4. None of these causes

Option 2 – common sunburn

Long term exposure to UV radiations causes

1. Skin diseases

2. Cancer

3. Common sun burn

4. (1) and (2)

Option 4 – (1) and (2)

UV radiations from the sun are strongly absorbed by

1. ionosphere

2. hydrosphere

3. ozone layer

4. none of these

Option 3 – ozone layer

Which of the following provides information about the universe which is not obtainable using an optical telescope?

1. Radiotherapy

2. Radiography

3. Radio astronomy

4. physiotherapy

Option 3 – Radio astronomy

The spectrum produced by the transitions of the electrons in atoms, is

1. Visible spectrum

2. UV spectrum

3. IR spectrum

4. Radiowaves

Option 2 – UV spectrum

We covered all the electromagnetic spectrum questions and answers MCQ’s in this post above for free so that you can practice well for the exam.

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