Physics Current Electricity Online Mcqs Test

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Question 1

1. The reciprocal of the resistance of a conductor is called

Answer

Conductance

Answer

Specific resistance

Answer

Effective resistance

Question 2

2. The drifty velocity of free electrons in a metallic conductor is

Answer

10¯³ ms¯¹

Answer

10¯⁴ ms¯¹

Answer

10¯⁵ ms¯¹

Answer

10¯⁶ ms¯¹

Question 3

3. In a house circuit, all electrical appliances are connected in parallel to each other between the line and neutral wires to get:

Answer

Same current

Answer

Same current and potential difference

Answer

Difference current and different potential difference

Answer

Different current but same potential difference

Question 4

4. The electromotive force of a battery or cell is the voltage between its terminals when:

Answer

Its internal resistance is maximum

Answer

The circuit is open

Answer

Its internal resistance is minimum

Answer

The circuit is closed

Question 5

5. Every source of current converts some non-electrical energy into

Answer

Mechanical energy

Answer

Chemical energy

Answer

Solar energy

Answer

All of these

Question 6

6. Thermocouples convert heat energy into

Answer

None of these

Answer

Chemical energy

Answer

Mechanical energy

Answer

Electrical energy

Question 7

7. A battery of emf 12V and internal resistance 0.5 is charged by a battery charger which supplied a 132 V d.c. supply using a series resistance of 11.5. What is the terminal voltage of the battery during changing?

Question 8

8. The emf is the “cause” and potential difference is its

Answer

None of these

Question 9

9. The resistivity of constant on is Ω m is

Answer

None of these

Answer

49 x 10¯⁸

Answer

50 x 10¯⁸

Answer

10 x 10¯⁸

Question 10

10. The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of resistor is

Answer

21 x 10³ ± 10%

Answer

21 x 10³ ± 5%

Answer

23 x 10¹ ± 10%

Answer

12 x 10³ ± 5%

Question 11

11. The potential difference across each resistance in series combination, if the resistances are different, is

Answer

Greater than highest resistance

Answer

None of these

Question 12

12. Resistance of a conductor depends upon

Answer

Physical state of the conductor

Answer

All of above

Answer

Nature of conductor

Answer

Dimension of conductor

Question 13

13. If the voltage across a fixed value of resistance is increased five times, what does the current do?

Answer

Not enough information

Answer

It stays the same

Answer

It increases by a factor of five

Answer

It decreases by a factor of five

Question 14

14. Production of heat due to an electric current following through a conductor is given by

Answer

Comptons effect

Answer

Joule Thomsons effect

Answer

Feed back effect

Answer

Joule effect

Question 15

15. A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

Question 16

16. When the temperature of a metallic conductor is increased its resistance:

Answer

Always decreases

Answer

Remains the same

Answer

Always increases

Answer

May increase or decrease

Question 17

17. The current through a metallic conductor is due to the motion of

Answer

Still under controversy

Answer

Free electrons

Question 18

18. Thermocouples convert:

Answer

Light energy into electrical energy

Answer

Heat energy into electrical energy

Answer

Kinetic energy into potential energy

Answer

Electrical energy into heat energy

Question 19

19. Cause of heat production in a current carrying conductor is

Answer

High resistance value

Answer

Collisions of free electrons with one another

Answer

High drift speed of free electrons

Answer

Collisions of free electrons with atoms or ions of conductor

Question 20

20. Two resistances of 2Ω and 3Ω connected in parallel are attached to a source of 20 V. The current through 3Ω resistance is

Question 21

21. If potential difference across the conductor is one volt and one ampere current is flowing, then resistance of the conductor is:

Answer

One coulomb

Answer

One ampere

Question 22

22. Terminal potential difference of a battery is greater than its emf when

Answer

The internal resistance of battery is zero

Answer

The battery is discharged

Answer

The battery is charged

Answer

The internal resistance of battery is infinite

Question 23

23. The graphical representation of Ohms law is

Answer

Straight line

Question 24

24. The wire used in rheostat, is made from

Answer

Constantan

Question 25

25. What type of temperature coefficient of resistance is thermistors?

Answer

Positive and negative

Question 26

26. A wire having very high value of conductance is said to be

Answer

No specific criterion available

Answer

Very good conductor

Answer

Moderately good conductor

Answer

An insulator

Question 27

27. Current provided by a battery is maximum when

Answer

Internal resistance equal to external resistance

Answer

None of these

Answer

Internal resistance is greater than external resistance

Answer

Internal resistance is less then external resistance

Question 28

28. Two electric bulbs of 200 W and 100 W have same voltage. If R₁ and R₂ be their resistance respectively then

Answer

R₂ = 4R₁

Answer

R₂ = 2R₁

Answer

R₁ = 4R₂

Answer

R₁ = 2R₂

Question 29

29. The strength of an magnetic field depends upon the

Answer

None of these

Answer

Value of current

Answer

Distance from the source

Question 30

30. A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

Question 31

31. Photovoltaic cell converts:

Answer

Heat energy into electrical energy

Answer

Chemical energy into electrical energy

Answer

None of these

Answer

Light energy into electrical energy

Question 32

32. The value of resistance depends upon

Answer

All of them

Answer

Physical state

Question 33

33. Internal resistance is the resistance offered by

Answer

Source of e m f

Question 34

34. A conductor which obeys Ohm’s law is called

Answer

None of these

Answer

Ohmic device

Answer

Neither Ohmic nor non Ohmic

Answer

Non-ohmaic device

Question 35

35. A conducting wire is drawn to double its length. Final resistivity of the material will be:

Answer

Same as original one

Answer

One-fourth of the original one

Answer

Double of the original one

Answer

Half of the original one

Question 36

36. In a voltmeter the conduction takes place due to

Answer

Electrons and holes

Answer

Electrons and ions

Answer

Holes only

Answer

Electrons only

Question 37

37. Which one of the following causes production of heat when current is set up in a wire?

Answer

Collisions of conduction electrons with atoms

Answer

Fall of electrons from higher orbits to lower orbits

Answer

Inter-electron collisions

Answer

Inter-atomic collisions

Question 38

38. The resistively ρ of Tungoston in Ωm is

Answer

4.00 x 10¯⁸

Answer

None of these

Answer

5.00 x 10¯⁸

Answer

4.8 x 10¯⁸

Question 39

39. Resistance of wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

Question 40

40. The resistivity of wire depends upon:

Answer

Its length

Answer

Its material

Answer

Its area of cross section

Question 41

41. A 100 watt bulb is operated by 200 volt, the current flowing through the bulb is:

Answer

Zero amperes

Answer

0.5 amperes

Question 42

42. Potentiometer is more sensitive than voltmeter, because

Answer

Potentiometer is sensitive

Answer

Voltmeter has a very high resistance

Answer

Potentiometer does not draw any current from a source of unknown potential difference

Answer

Voltmeter has a very low resistance

Question 43

43. A heater coil rated at (1000 W – 200 V) is connected to 110 volt line. What will be the power consumed?

Question 44

44. Which one is the best material for making connecting wires?

Question 45

45. A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

Question 46

46. If doubling the voltage across a resistor doubles the current through the resistor then

Answer

The resistor value increased

Answer

The resistor value did not change

Answer

It is impossible to determine the change in the resistor value

Answer

The resistor value decreased

Question 47

47. When the resistors are connected in series, the equivalent resistance is always:

Answer

Equal to the greatest resistance in series

Answer

Less than the largest resistance in series

Answer

Less than the smallest resistance in series

Answer

Greater than the greatest resistance in series

Question 48

48. In the figure a carbon resistor has bands of different colours on its body as mentioned in. the value of the resistance is

Question 49

49. At ordinary temperature, an increase in temperature increases the conductivity of

Answer

Semiconductor

Question 50

50. Power dissipated in the form of ‘V’ and ‘R’ can be determine as:

Question 51

51. Resistively depends upon the resistance of the material of

Answer

None of these

Question 52

52. The unit of conductance of a material is

Answer

All of these

Question 53

53. The thermistors are usually made of

Answer

Semi conducting materials having low temperature coefficient of resistivity

Answer

Metals with high temperature coefficient of resistivity

Answer

Metal oxides with high temperature coefficient of resistivity

Answer

Metals with low temperature coefficient of resistivity

Question 54

54. Specific resistance of a wire depends upon

Answer

Cross-section area

Answer

None of these

Question 55

55. High negative temperature coefficient thermistors are very accurate for measuring low temperature near

Question 56

56. A factory gets its electrical power from a generator two miles away. The wires connecting the generator to the factory terminals have a resistance of 0.04 Ω/miles. When the generator supplies 50 Ampere to the factory, the terminal voltage at the generator is 120 Volts. A voltmeter connected to the factory terminals should then read

Question 57

57. Reciprocal of resistivity is called

Answer

Flexibility

Answer

Conductivity

Answer

Resistance

Answer

Inductance

Question 58

58. The conductivity of a superconductor is

Answer

Very large

Answer

Very small

Question 59

59. The passage of an electric current produces

Answer

All of these

Answer

Chemical effect

Answer

Magnetic effect

Answer

Heating effect

Question 60

60. A cell of emf 1.56 Volt is connected directly to an ammeter of resistance 0.05Ω. If the current in the circuit is 2.0A, the internal resistance of the cell is

Question 61

61. What is the current (I) in the circuit, as shown in the figure.

Question 62

62. The colour coded carbon resistances are made by

Answer

All of these

Answer

Low grade ceramic rod

Answer

Ceramic rod

Answer

High grade ceramic rod

Question 63

63. If voltage across a resistance doubles

Answer

The current is unchanged

Answer

None of these

Answer

The resistance doubles

Answer

The current is halved

Question 64

64. A wire of uniform area of cross-section A length La and resistance R is cut into two parts. Resistivity of each part

Answer

Is doubled

Answer

Becomes zero

Answer

Remains the same

Answer 159

None of these

Answer 160

Repulsion of charges

Answer 161

Attraction of charges

Answer 162

None of these

Answer 163

Not enough information

Answer 164

Stay the same

Answer 165

V ∆Q/∆t

Answer 166

V/Q x ∆t

Answer 167

∆W/∆Q x V

Answer 168

Q ∆V/∆t

Answer 169

Negative charges

Answer 170

None of these

Answer 171

Positive charges

Answer 172

Both positive and negative charges

Answer 173

Increasing the area

Answer 174

Decreasing the length

Answer 175

None of these

Answer 176

Changing resistivity

Answer 177

Flow of positive charge

Answer 178

Flow of neutron

Answer 179

Flow of negative charge

Answer 180

None of these

Answer 181

To convert electric energy in to heat energy

Answer 182

To produce more heat

Answer 183

To convert heat energy into chemical energy

Answer 184

To convert heat energy in to electrical energy

Answer 185

The circuit

Answer 186

The conductor

Answer 187

Source of emf

Answer 188

The resistor

Answer 189

None of these

Answer 190

0.625 x 10¹⁹

Answer 191

1.6 x 10¯¹⁹

Answer 192

1.6 x 10¹⁹

Answer 193

0.625 x 10¹²

Answer 194

Solar energy

Answer 195

None of these

Answer 196

All of these

Answer 197

None of these

Answer 198

Magnetic effect

Answer 199

Chemical effect

Answer 200

Heating effect

Answer 201

None of these

Answer 202

1.52 x 10¯⁸

Answer 203

1.56 x 10¯⁸

Answer 204

1.54 x 10¯⁸

Answer 205

Ohms, kilohms, and megohms

Answer 206

Resistor size and resistor value

Answer 207

None of these above

Answer 208

Resistance, voltage, and current

Answer 209

Kirchhoff’s point rule

Answer 210

Law of conservation of charge

Answer 211

Kirchhoff’s current rule

Answer 212

All of them

Answer 213

No heat is produced in wire

Answer 214

Less heat is produced in thick wire

Answer 215

More heat is produced in thick wire

Answer 216

More heat is produced in thin wire

Answer 217

Cross-sectional area

Answer 218

Both diameter and cross-sectional area

Answer 219

None of these

Answer 220

Both a and b

Answer 221

Minimum current flows through the galvanometer branch

Answer 222

Potential difference across galvanometer branch is zero

Answer 223

Maximum current flows through the galvanometer branch

Answer 224

Potential difference across galvanometer branch is maximum

Total Questions:	97
Time Allowed:	35 Minutes
Total Marks:	97
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Current Electricity Online Mcqs Test

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Malik Tahir

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Important Physics Current Electricity Question and Answer

Physics Current Electricity Practice Test Online With Explanation

How to Score High in Physics Current Electricity Online Mcqs Test?

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Malik Tahir

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