MCQ Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers

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All questions answers in the last paragraph

Q1. The magnetic material around the coil is wound is called:

(A) magnetic substance
(B) core
(C) soft iron
(D) none

Q2. The amount of heat produced in a wire depends on

(A) material
(B) length
(C) thickness
(D) all of these

Q3. Which of the following precaution need not be taken while using electric appliances?

(A) Never touch lighted electric bulb connected to mains.
(B) Never experiment with the electric supply from mains.
(C) Never use any wire to replace fuse wire.
(D) Never turn switch in ‘ON’ position.

Q4. The metal which is poor conductor of electricity is

(A) Gold
(B) Iron
(C) Aluminium
(D) Mercury

Q5. Electric current has energy called:

(A) voltmeter
(B) filament
(C) electrical energy
(D) none of these

Q6. Electromagnet loses its magnetic property when

(A) Current is very high
(B) Current is switched OFF
(C) Heat is increased
(D) Current is switched ON

Q7. Which of the devices use a battery?

(A) Torch
(B) Transistor
(C) TV remote control
(D) All of these

Q8. In making a battery

(A) positive terminal of one cell is connected to the negative terminal of the next cell
(B) positive terminal of one cell is connected to the positive terminal of the next cell
(C) negative terminal of one cell is connected to the negative terminal of the next cell
(D) none of the above

Q9. Bulbs, wires, cells and switches are known as the of a circuit.

(A) element
(B) switch
(C) filament
(D) none of these

Q10. A __ is used in torches.

(A) Generator
(B) Fuse
(C) Secondary cell
(D) Dry cell

Q11. The coil of wire contained in an electric heater is known as

(A) component
(B) element
(C) circuit
(D) spring

Q12. When the switch is in the ‘ON’ position, the electric circuit is said to be

(A) closed
(B) open
(C) complete
(D) both (A) and (C)

Q13. A device which prevents or allows the current to flow through it

(A) Motor
(B) Terminal
(C) Conductor
(D) Switch

Q14. An element measure the potential difference between two points in an electric circuit is:

(A) voltmeter
(B) filament
(C) circuit
(D) ammeter

Q15. Which one of the following is based on the heating effect of current?

(A) Geyser
(B) Hair dryer
(C) Immersion rod
(D) All of these

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