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
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