CIE iGCSE Co-Ordinated Science P3.3 Electromagnetic spectrum Exam Style Questions Paper 2
Question
Gamma rays and microwaves are both electromagnetic radiations.
Which statement about their frequencies and speeds in a vacuum is correct?
(A) Gamma rays have greater frequencies than microwaves and travel at a greater speed.
(B) Gamma rays have greater frequencies than microwaves and travel at the same speed.
(C) Gamma rays have smaller frequencies than microwaves and travel at a greater speed.
(D) Gamma rays have smaller frequencies than microwaves and travel at the same speed.
▶️Answer/Explanation
Ans: B
Question
Which statement about the core of an electromagnet is correct?
(A) It is made of soft iron because soft iron is easy to magnetise.
(B) It is made of soft iron because soft iron does not lose its magnetism easily.
(C) It is made of steel because steel is easy to magnetise.
(D) It is made of steel because steel loses its magnetism easily.
▶️Answer/Explanation
Ans: A
Question
A wire of a certain length has a resistance of 8.0Ω. A second wire made of the same material has
double the length and double the cross-sectional area of the first wire.
What is the resistance of the second wire?
(A) 4.0Ω
(B) 8.0Ω
(C) 16Ω
(D) 32Ω
▶️Answer/Explanation
Ans: B
Question
Which region of the electromagnetic spectrum is often involved in heat transfer by radiation?
(A) infrared
(B) radio
(C) ultraviolet
(D) X-rays
▶️Answer/Explanation
Ans: A