PSEB Punjab Board Class 7 Science Textbook Solution Chapter 14 Electric Current and its effects Exercise Questions and Answers
Chapter 14 Electric Current and its effects
Q.1 Fill in the blanks:
(i) Shorter line in the symbol for cell represents …………………. .
Answer: Negative terminal
(ii) Combination of two or more cells is called …………………. .
Answer: Battery
(iii) When the key is in ………………….. position current flows through the circuit.
Answer: On.
(iv) In a battery, the positive terminal of one cell is connected to the ………………….. terminal of the next cell.
Answer: Positive.
(v) Electric heater works on the ………………… effect of current.
Answer: Heating.
Q.2 True or false:
(i) To make a battery of two cells, positive terminal of one cell is connected to negative terminal of another.
Answer: True.
(ii) Electric iron works on the basis of heating effect of current.
Answer: True
(iii) Magnetic crane is based on magnetic effect of current.
Answer: True
(iv) When current flows in the circuit then circuit is called open circuit.
Answer: False.
(v) An electric bell works on the principle of electromagnet.
Answer: True.
Q.3 Match the column:
Answers :-
(i) Electric cell :- d. Safety device
(ii) Electric heater :- b. Heating effect of current
(iii) Electric fuse :- a. Electric component
(iv) Magnetic crane :- c.Electromagnet
Q.4 Choose the correct answer.
(i) Which appliance is not based on heating effect of current?
(a) Electric toaster
(b) Loudspeaker
(c) Heater
(d) Electric iron.
Answer: (b) Loudspeaker.
(ii) Which of these devices are not based on magnetic effect of current ?
(a) Room heater
(b) Magnetic crane
(c) Electric bell
(d) Loudspeaker.
Answer: (a) Room heater
(iii) The amount of heat produced in wire depends on:
(a) Nature of material
(b) Length
(c) Thickness
(d) All of these.
Answer: (d) All of these.
(iv) The wire used in the bulb is called:
(a) Element
(b) Spring
(c) Filament
(d) Component.
Answer: (c) Filament.
(v) An electric bell consists of:
(a) Gong
(b) Hammer
(c) Electromagnet
(d) All of these.
Answer: (d) All of these.
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