### Breaking News Chapter - 13
Current electricity
Marks 40
Time allowed 45 minutes
Punjab college Shakargarh
*Required
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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