Junior Secondary · Science

Electromagnetic spectrum : Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Electromagnetic spectrum .

10 questions23 marksFree, no account

Question 1

1 mark

In the visible spectrum of light, which colour is located between yellow and blue?

Question 2

1 mark

Among Infrared radiation, Visible light, and Ultraviolet (UV) radiation, which statement correctly compares their physical properties and potential hazards?

Question 3

1 mark

If the frequency of an electromagnetic wave is doubled while it is traveling through a vacuum, how will its wavelength and speed change?

Question 4

1 mark

Which type of electromagnetic radiation is primarily responsible for causing sunburn upon excessive exposure to the sun?

Question 5

1 mark

In the electromagnetic spectrum, different types of radiation are categorized by their physical properties. Which of the following statements is correct?

Question 6

2 marks

In a vacuum, does ultraviolet radiation travel faster than, slower than, or at the same speed as visible light?

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Question 7

3 marks

Search and rescue teams often use infrared cameras to locate people trapped in dark or smoke-filled environments. Explain why infrared radiation is more effective than visible light for this specific task.

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Question 8

6 marks

Explain how the energy level of X-rays allows them to be used for imaging broken bones, and describe why medical staff must use lead shielding when operating X-ray machines daily.

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Question 9

3 marks

When white light is passed through a glass prism, it is dispersed into a band of different colours known as the visible spectrum.

(a) List the seven colours of the visible spectrum in order of increasing frequency.
(b) Which colour in the visible spectrum has the longest wavelength?
(c) State whether visible light is the only form of radiation in the electromagnetic spectrum.

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Question 10

4 marks

A student is investigating how objects appear under different coloured lights in a dark laboratory.

(a) State the three primary colours of light.
(b) A student places a purely blue filter in front of a white light source and shines it on a green leaf. What colour will the leaf appear to be?
(c) Explain your answer in part (b) by describing how the leaf interacts with the blue light.

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