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Current Electricity Quiz practies questions test1
Current Electricity Quiz practies questions test1
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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
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