CIE iGCSE Co-Ordinated Science P3.3 Electromagnetic spectrum Exam Style Questions Paper 1
Question
Which statement about the electromagnetic spectrum is correct?
A Gamma-radiation has a lower frequency than visible light.
B Infrared radiation has a higher frequency than radio waves.
C Microwaves have a smaller wavelength than ultraviolet radiation.
D X-rays have a larger wavelength than visible light.
▶️Answer/Explanation
Ans :A
Question
Which group shows electromagnetic waves in order of increasing frequency (lowest frequency first)?
(A) gamma-rays → X-rays → ultraviolet waves
(B) microwaves → infrared waves → gamma-rays
(C) ultraviolet waves → radio waves → infrared waves
(D) X-rays → radio waves → microwaves
▶️Answer/Explanation
Ans: B
Question
Which type of electromagnetic wave is emitted by a television remote controller?
(A) gamma (ϒ)-rays
(B) infrared
(C) ultraviolet
(D) X-rays
▶️Answer/Explanation
Ans: B
Question
Which electromagnetic waves have the lowest frequency?
(A) gamma
(B) infrared
(C) ultraviolet
(D) radio
▶️Answer/Explanation
Ans: D
Question
Which part of the electromagnetic spectrum is involved in thermal energy transfer by radiation?
A. infrared
B. radio
C. ultraviolet
D. X-rays
▶️Answer/Explanation
Answer: A. infrared
Explanation: Infrared radiation is responsible for thermal energy transfer by radiation. It is emitted by hot objects and can be absorbed by other objects, causing them to heat up.
Question
Which list consists of three regions of the electromagnetic spectrum in order of increasing frequency (lowest first)?
A. Microwaves, radio waves, ultraviolet waves
B. Microwaves, ultraviolet waves, radio waves
C. Radio waves, microwaves, ultraviolet waves
D. Ultraviolet waves, radio waves, microwaves
▶️Answer/Explanation
Answer: C. Radio waves, microwaves, ultraviolet waves.
Explanation: The order of increasing frequency in the electromagnetic spectrum is: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays.
Question
Radio waves and X-rays have different wavelengths. One of these two types of wave is ionising radiation. Which row shows the type of wave with the smaller wavelength and the type of wave that is ionising radiation?
▶️Answer/Explanation
Answer: D
Explanation: X-rays have a smaller wavelength compared to radio waves. Additionally, X-rays are ionising radiation, meaning they have enough energy to remove tightly bound electrons from atoms, causing ionisation.
Question
Which electromagnetic waves are used by television remote controllers?
A gamma
B infra-red
C microwaves
D X-rays
▶️Answer/Explanation
Answer: B
Explanation: Television remote controllers use infra-red waves to transmit signals.
Question
Which region of the electromagnetic spectrum is often involved in heat transfer by radiation?
A. infra-red
B. radio
C. ultraviolet
D. X-ray
▶️Answer/Explanation
Answer: A
Explanation: Infra-red radiation is commonly associated with heat transfer by radiation. It is emitted by warm objects and can be absorbed by other objects, increasing their temperature.