#### Term 2 Electricity One Mark Questions with Answer

7th Standard

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 19
4 x 1 = 4
1. In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ------------------------

(a)

10 A

(b)

1 A

(c)

10 V

(d)

1 V

2. In the circuit shown, which switches (L, M or N) must be closed to light up the bulb

(a)

switch L only

(b)

switch M only

(c)

Switch M and N only

(d)

either switch L or switches M and N

3. Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?

(a)

2.5 mA

(b)

25 mA

(c)

250 mA

(d)

2500 mA

4. In which of the following circuits are the bulb connected in series?

(a)

(b)

(c)

(d)

5. 5 x 1 = 5
6. The direction of conventional current is ------------------ to electron flow.

()

opposite

7. One unit of coulomb is charge of approximately ------------------ protons or electrons.

()

6.242 x 1018

8. ------------------ is used to measure the electric current.

()

Ammeter

9. In conducting materials electrons are ------------------ bounded with atoms.

()

loosely

10. S.I. unit of Electrical conductivity of a conductor is --------------------

()

Siemens/meter (S/m)

11. 5 x 1 = 5
12. Electron flow is in the same direction to conventional current flow.

(a) True
(b) False
13. The fuse wire does not melts whenever there is overload in the wiring.

(a) True
(b) False
14. In a parallel circuit, the electric components are divided into branches.

(a) True
(b) False
15. The representation of the electric current is A.

(a) True
(b) False
16. The electrical conductivity of the semiconductor is in between a conductor and an insulator.

(a) True
(b) False
17. 5 x 1 = 5
18. Cell

19. (1)

Safety device used in electric circuit

20. Switch

21. (2)

A device which converts chemical energy into electrical energy.

22. Circuit

23. (3)

A complete path for the flow of an electric current

24. Miniature circuit Breaker

25. (4)

Used to open or close a circuit

26. Fuse

27. (5)

Reset by hand, circuit becomes complete once again