Chapter - 13

Current electricity

Marks 40

Time allowed 45 minutes

**Punjab college Shakargarh**

**ATEEQ KHADIM**

*Required

Your Name *

Section Name *

1. The resistance of conductor does not depend on its *

1 point

Length

Cross sectional area

Resistivity

None

2. When the temperature of conductor is raised, its conductance *

1 point

Increases

Decreases

Remain constant

Cannot say

3. When the temperature of semi conductors decrease its conductivity *

1 point

Increases

Decreases

Remains constant

Cannot say

4. By increasing thickness of wire, its resistance will be *

1 point

Increases

Decrease

Remains same

All are possible

5. A wire of uniform area of cross section A length L and resistance R is cut into two equal parts. The resistivity of each part *

1 point

Is doubled

Remains same

Is halved

Becomes four time

6. SI unit of temperature coefficient of resistivity of material is *

1 point

Mho

K

Per Kelvin

Ohm

7. The resistivity of substances depend upon its *

1 point

Temperature

Length

Area

All of these

8.Which one have negative value of temperature coefficient *

1 point

Silver

Gold

Copper

Carbon

9. mho / meter is the unit of *

1 point

Conductivity

Resistivity

Resistance

Conductance

10. The first band in carbon resistance indicates the *

1 point

No. of zeros

First digit

2nd digit

Tolerance

11. If there is no fourth band, it means tolerance is *

1 point

10%

5%

7%

20%

12. A zero ohm resistor is indicated by : *

1 point

A single black color

Two black color

A single white color

A single yellow color

13. The wire wound over an insulating cylinder of rheostat is made of *

1 point

Manganin

Gold

Copper

Silver

14. Thermistors with high negative temperature coefficient are very accurate for measuring low temperature nearly *

1 point

5 K

10 K

15 K

20 K

15. Heat sensitive resistors are called *

1 point

Resistors

Capacitors

Thermistors

Inductors

16. In color code of resistance violet color represents *

1 point

6

7

8

9

17. If first band of resistance is color of red, 2nd band is violet and third band is color of black. What is the resistance without tolerance? *

1 point

270

2700

27

250

18. Resistance tolerance of silver band is *

1 point

5%

6%

10%

20%

19. Power dissipation is resistor R due to electric current I is given by *

1 point

P = IR

P = I^2 R

P = V/R

Both a and b

20. Heat generated by a 100 watts bulb in one hour is *

1 point

3.6 x 10^5 J

3.6 x 10^6 J

3.6 x 10^4 J

3.6 x 10^3 J

22. SI unit of electromotive force is *

1 point

Newton

J/C

Volt

Both b and c

23. The terminal potential difference is always -------- to emf *

1 point

Equal

Greater than

Less than

All are possible

21. The resistance of a 60 watt bulb in a 120 volt line is *

1 point

20 ohms

240 ohms

0.5 ohms

100 ohms

24. For an open circuit, when no current passes through resistance R, the voltmeter reads *

1 point

Emf E less than V

E = 0

Emf E as terminal voltage

E = Vt + Ir

25. The emf is the cause and potential difference is its *

1 point

Current

Power

Effect

Energy

26. The maximum power is delivered to a load resistance R, when the internal resistance of The source is *

1 point

r = 0

r = infinite

r = R

r = R/2

27. The maximum output power delivered to a load resistance is given by *

1 point

E / 4R

2/4R

E^2 / 2R

none of these

28. Kirchhoff 1st rule is according to law of conservation of *

1 point

Energy

momentum

Charge

Mass

29. Three arms of a Wheatstone bridge are of 75 ohms resistance each. What is the resistance of fourth arms? *

1 point

225 ohm

150 ohm

75 ohm

300 ohm

30. An ideal voltmeter should have resistance *

1 point

Infinite

zero

very low resistance

Between zero and infinity

31. For an open circuit, the current flowing through a circuit will be *

1 point

Infinite

Finite

maximum

Zero

32. Electrical energy is measured in *

1 point

Watt

kilowatt

horse power

killowatt hour

33. If a resistor is traversed in the opposite direction of current then the change in potential is *

1 point

Zero

negative

Positive

constant

34. The terminal potential difference of a battery is greater than its emf when *

1 point

The battery is discharged

The battery is being charged

The internal resistance of battery is zero

the battery circuit is open

35. When the Wheatstone bridge is balanced, then *

1 point

Galvanometer shows full deflection

Potential difference across galvanometer is zero

Potential difference across galvanometer is maximum

Maximum current flowing through galvanomter

36. The emf of a source can be calculated by *

1 point

E = △W/ △Q

E = △Q / △W

E = △W △Q

E = △W + △Q

37. Which of the following bulb each of 220Volt has the least resistance *

1 point

100 Watt

200 Watt

500 Watt

1000 Watt

38. Germinium have *

1 point

+ve temperature coefficient

-ve temperature coefficient

Zero temperatures coefficient

Both a and b

39. SI unit of specific resistance is *

1 point

Ohm

per ohm

ohm meter

mho meter

40. Siemen is the unit of *

1 point

Resistance

Resistivity

conductance

conductivity

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