12TH Physics - Current Electricity MCQS QUIZ

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Current Electricity MCQ Test

1. Which of the following has a negative temperature coefficient of resistance?

Copper
Tungsten
Carbon
Silver

2. The temperature coefficient of resistance for alloys is ______.

High
Positive
Very low
Negative

3. Conductors which obey Ohm's law are called ______.

Dielectrics
Superconductors
Ohmic conductors
Semiconductors

4. Conductivity is the reciprocal of ______.

Resistance
Specific resistance (Resistivity)
Conductance
Potential difference

5. Resistance increases with increase in temperature for ______.

Conductors
Semiconductors
Insulators
Superconductors

6. Which of the following are identical conductors?

Germanium, Silicon
Silver, Wood
Aluminium, Constantan
Bakelite, Iron

7. Which of the following material has the highest specific resistance?

Rubber
Silver
Germanium
Glass

8. Temperature coefficient of resistance for metals is ______.

Constant
Positive
Zero
Negative

9. The potential gradient of a potentiometer wire depends on ______.

Current through the wire
Resistance per unit length
Both (a) and (b)
None of the above

10. Joule's heating effect is desirable in ______.

AC Dynamo
DC Dynamo
Water Heater
Transformer

11. The sensitivity of a potentiometer can be increased by ______.

Decreasing the wire length
Increasing the wire length
Increasing the emf in primary circuit
All of the above

12. Two identical resistors are connected in parallel and then in series. Their effective resistances are in the ratio ______.

1 : 2
2 : 1
1 : 4
4 : 1

13. Peltier effect is the converse of ______.

Joule effect
Raman effect
Thomson effect
Seebeck effect

14. Nichrome wire is used as a heating element because it has ______.

Low specific resistance
Low melting point
High specific resistance
High thermal conductivity