CBSE Class 8 Science Chemical Effects of Electric Current Assignment Set B

CBSE Class 8 Science - Chemical Effects of Electric Current (2)

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1.Positive terminal of the cell is indicated by:

(A) The shorter line. (B) The longer line. (C) Either of the two lines. (D) None of these.

2.Symbol of a cell in an electric circuit is represented by:

(A) A longer line and a shorter line.

(B) A longer and a shorter vertical parallel line.

(C) A horizontal longer line and a vertical shorter line.

(D) A vertical longer line and a horizontal shorter line.

3.Battery is having:

(A) Two or more cells connected to each other in any manner.

(B) Positive terminal of one cell is connected to the positive terminal of the next cell.

(C) Two or more cells connected in such a way that the positive terminal of one cell is connected to the

negative terminal of the next.

(D) Only one cell.

4.Lines connecting the various components represent:

(A) Wires. (B) Terminals of the battery. (C) Battery. (D) Key.

5.Switch can be connected:

(A) To the positive terminal of the battery only. (B) Anywhere in the circuit.

(C) To the negative terminal of the battery only. (D) If required only.

6.When the switch is in the OFF position, the circuit is incomplete. It is said to be:

(A) Open and the current does not flow in the circuit.

(B) Closed and the current flows in the circuit.

(C) Closed and the current does not flow through any part of the circuit.

(D) Closed and the current does not flow through the bulb only.

7.A coil of wire present in electric heater is called:

(A) An element. (B) A compound. (C) A mixture. (D) A solution.

8.In all primary cells chemical energy is changed into…………… energy.

(A) Potential. (B) Kinetic. (C) Electrical. (D) None.

9.Appliance, which do not use electric energy:

(A) Geyser. (B) Pressure cooker. (C) Mixie. (D) Immersion rod.

10.The decomposition of an electrolyte when electricity is passed through it is called:

(A) Electroplating. (B) Electrolysis. (C) Conduction. (D) None.

11.The electrical process of coating an inexpensive conductor with a metal is called:

(A) Electroplating. (B) Electrolysis. (C) Conduction. (D) None.

12.……………..is used in the extraction of metals from their ores.

(A) Electroplating. (B) Electrolysis. (C) Conduction. (D) None.

13.. ………… is used for refining certain metals such as copper and zinc.

(A) Electroplating. (B) Electrolysis. (C) Conduction. (D) None.

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