CBSE Class 7 Science Water: A Precious Resource Quiz 1

1. 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

2. Where can the key or switch be placed in the circuit?

A Left side of the battery B Right side of the battery C Can be placed anywhere in the circuit D Near the positive terminal of the bulb

3. 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

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

A component B element C circuit D spring

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

A material B length C thickness D all of these

6. Which mark is necessary on electric appliances?

A AGMARK B ISI C FICCI D KSK

7. When an electric current flows through a copper wire AB as shown in Figure, the wire

A deflects a magnetic needle placed near it B becomes red hot C gives electric shock D behaves like a fuse

8. Choose the statement which is not correct in the case of an electric fuse.

A Fuses are inserted in electric circuits of all buildings. B There is a maximum limit on the current which can safely flow through the electric circuits. C There is a minimum limit on the current which can safely flow in the electric circuits. D If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.

9. Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?

A We should never touch a lighted electric bulb connected to the mains. B We should never experiment with the electric supply from the mains or a generator or an inverter. C We should never use just any wire or strip of metal in place of a fuse. D We should never turn the switch in ON position.