Science Gr 9

1.

2 points

Refer to diagram B to answer the following question:
Calculate the amount of charge that passes through the ammeter in 1 hour when S is closed

432 C

3,3 C

3000 C

4320 C

2.

2 points

If the resistance of a resistor is kept constant, what would doubling the potential difference have on the current?

The current will double

The current will halve

The current will remain constant

There will be no current

3.

2 points

Refer to diagram B to answer the following question:
What will be the reading on the ammeter with S closed?

No reading

3 A

1,2 A

4 A

4.

2 points

Refer to diagram B to answer the question:
Calculate the amount of work done in the 3 ohm resistor in 2 minutes when S is closed

3,6 V

120 J

51,8 J

518,4 J

5.

2 points

The unit in which an electrical current is measured:

joule

coulomb

ampere

volt

ohm

6.

2 points

The resistance of a piece of wire is 20 Ω if the potential difference of … across the wire leads to a current of 2 A.

80 V

0,1 V

40 V

10 V

7.

2 points

Refer to diagram A to answer this question:
The reading on Voltmeter 1 will be:

6 V

4 V

12V

2,7 V

8.

2 points

Refer to diagram A to answer this question:
The reading on Ammeter 1 will be:

2A

0,2A

10A

2V

9.

2 points

In any circuit in series the sum of the potential differences across each individual resistor is always equal to the potential difference across the terminals of the battery

True

False

10.

2 points

If a constant current of 2 A flows for three minutes in a conductor, the total charge that passes through the conductor is:

90 C

360 C

(2/3) C

(3/2) C

6 C

11.

2 points

Refer to diagram B to answer the following question:
Calculate the total resistance in the circuit:

16 ohm

10 ohm

20 ohm

15 ohm

12.

2 points

What is the current that flows from the positive terminal to the negative terminal of a cell known as?

Electron current

Reverse current

Resistance current

Conventional current

13.

2 points

Refer to diagram A to answer this question:
The resistance of the Resistor 1 and Resistor 2 will be ....

16 ohm; 8 ohm

2 ohm; 4 ohm

1 ohm; 2 ohm

4 ohm; 2 ohm

14.

2 points

Refer to diagram A to answer the question:
The effective resistance in the circuit will be:

1,3 ohm

2 ohm

6 ohm

4 ohm

15.

2 points

Three resistors, one of 12 ohm, the second of 6 ohm and the third of 4 ohm are connected in parallel. The effective resistance of the combination is:

12 ohm

0,5 ohm

4 ohm

2 ohm

22 ohm