Current Electricity Quiz practies questions test1

Thank you very much for taking test

Test your caliber

1. The S.I. unit of power is ______.
henry	coulomb
watt	watt-hour

2. Electric pressure is also called ______.
resistance	power
voltage	energy

3. The substances whfch have a large number of free electrons and offer a low resistance are called ______.
insulators	inductors
semi-conductors	conductors

4. Out of the following which is not a poor conductor ?
Cast iron	Copper
Carbon	Tungsten

5. Out of the following which is an insulating material ?
Copper	Gold
Silver	Paper

6. The property of a conductor due to which it passes current is called _____.
resistance	reluctance
conductance	inductance

7. Conductance is reciprocal of ______.
resistance	inductance
reluctance	capacitance

8. The resistance of a conductor varies inversely as _____.
length	area of cross-section
temperature	resistivity

9. With rise in temperature the resistance of pure metals _____.
increases	decreases
first increases and then decreases	remains constant

10. With rise in temperature the resistance of semi-conductors
decreases	increases
first increases and then decreases	remains constant

11. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around ______.
1.2 x 10~8 Q-m	1.4 x 10~8 Q-m
1.6 x 10""8 Q-m	1.8 x 10"8 Q-m

12. Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is ______.
5 ohms	10 ohms
15 ohms	55 ohms

13. An instrument which detects electric current is known as _____.
voltmeter	rheostat
wattmeter	galvanometer

14. In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is ______.
33 V	66 v
80 V	132 V

15. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is ______.
400 Q	600 Q
800 Q	1000 Q

16. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
18 Q	36 Q
48 Q	64 Q

17. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Q. If the same four wires are connected is series the effective resistance will be _____.
1 Q	2 Q
3 Q	4 Q

18. A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is
6.4 A, 6.9 A	6.4 A, 9.6 A
4.6 A, 6.9 A	4.6 A, 9.6 A

19. Current velocity through a copper conductor is _____.
the same as propagation velocity of electric energy	independent of current strength
of the order of a few ^.s/m	nearly 3 x 108 m/s

20. Which of the following material has nearly zero temperature co-efficient of resistance?
Manganin	Porcelain
Carbon	Copper