Question Paper
Class / Subject: Class 8 (CBSE) · Science
Chapter: Chapter 4 — Chapter 4: Electricity: Magnetic and Heating Effects
Time Allowed: 15 minutes
Max Marks: 6
1. A current-carrying wire produces a: [1]
(A) magnetic field
(B) sound wave
(C) light wave
(D) chemical reaction
2. An electromagnet loses its magnetism when: [1]
(A) the current is switched off
(B) the current is switched on
(C) it is heated
(D) it is cooled
3. The magnetic effect of electric current was first discovered by: [1]
(A) Hans Christian Oersted
(B) Isaac Newton
(C) Albert Einstein
(D) Michael Faraday
4. The heating effect of current is used in: [1]
(A) an electric heater
(B) a compass
(C) a magnet
(D) a mirror
5. Fuses work by using the heating effect to: [1]
(A) melt and break the circuit if current is too high
(B) increase current flow
(C) generate light only
(D) store electricity
6. Nichrome wire is commonly used in heating appliances because it has: [1]
(A) high resistance
(B) low resistance
(C) no resistance
(D) magnetic properties