Current Electricity MCQ Questions Class 12 Physics Chapter 3

Current Electricity MCQ Questions Class 12 Physics Chapter 3

NCERT MCQ Questions for Class 12 Physics Chapter 3 Current Electricity. Current Electricity MCQ Questions with Answers from Class 12 Physics.

Current Electricity MCQ Questions Class 12 Physics Chapter 3

Current Electricity Multiple Choice Questions with Answers Class 12 Physics Chapter 3 PDF is available.

1) The rate of flow of charge per unit time is called as

a) Electric field

b) Electric current

c) Electric potential

d) Electric charge

Ans: b) electric current

2) The SI unit of Current is

a) C

b) V

c) A

d) N

Ans: c) A

3) The materials which produces electric current in them when electric field is applied to them are called as

a) Insulators

b) Semiconductor

c) Conductors

d) None

Ans: c) conductors

4) The direction of flow of electrons is from

a) Positive to negative

b) Negative to positive

c) Both a and b

d) None

Ans: b) negative to positive

5) According to Ohm’s law

a) V is directly proportional to I

b) V is inversely proportional to I

c) V is directly proportional to R

d) V is inversely proportional to R

Ans: a) V is directly proportional to I

6) The quantity V/I is called as

a) Power

b) Electric current

c) Resistance

d) None

Ans: c) resistance

7) The SI unit of resistance is

a) C

b) A

c) Ohm

d) None

Ans: c) Ohm

8) The resistance of the conductor is

a) Directly proportional to cross sectional area

b) Inversely proportional to cross sectional area

c) Independent of the cross sectional area

d) None

Ans: b) inversely proportional to cross sectional area

9) The resistance of the conductor is directly proportional to

a) Length of the conductor

b) Area of cross section of conductor

c) Electric current

d) None

Ans: a) length of the conductor

10) The current per unit area is called as

a) Charge density

b) Surface density

c) Current density

d) None

Ans: c) current density

11) The SI unit of Current density is

a) A/m

b) A/m2

c) Am

d) Am2

Ans: b) A/m2

12) The reciprocal of resistivity is called as

a) Resistance

b) Electric current

c) Conductivity

d) None

Ans: c) conductivity

13) The magnitude of drift velocity per unit electric field is called as

a) Resistivity

b) Conductivity

c) Mobility

d) Drift velocity

Ans: c) mobility

14) The SI unit of mobility is

a) m2 /V

b) m2 / Vs

c) m2 V s

d) None

Ans: b) m2 /V s

15) Mobility is

a) Positive

b) Negative

c) Neutral

d) Zero

Ans: a) positive

16) The materials having resistivity in the range 10-8 – 10-6 ohm m are called as

a) Conductors

b) Metals

c) Semiconductor

d) Both a and b

Ans: d) both a and b

17) The SI unit of resistivity is

a) Ohm

b) Ohm/m

c) Ohm m

d) None

Ans: c) ohm m

18) The materials having resistivity greater than 1018 are called as

a) Insulators

b) Semiconductor

c) Conductors

d) None

Ans: a) insulators

19) Which of the following are insulators

a) Ceramics

b) Rubber

c) Plastics

d) All

Ans: d) all

20) The materials having resistivity in between insulators and conductors are called as

a) Superconductors

b) Semiconductors

c) Insulators

d) Resistors

Ans: b) semiconductors

21) In case of semiconductors, the resistivity decreases with

a) Increase in temperature

b) With decrease in temperature

c) Remains same with change in temperature

d) None

Ans: a) increase in temperature

22) The commercially produced resistors for domestic use or in laboratories are

a) Wire bound resistors

b) Carbon resistors

c) Both a and b

d) None

Ans: c) both a and b

23) Which of the following are alloys

a) Manganin

b) Constantan

c) Nichrome

d) All

Ans: d) all

24) The blue colour resistor has number and multiplier as

a) 7, 107

b) 6, 106

c) 8, 108

d) 5, 105

Ans: b) 6, 106

25) The brown colour resistor has number and multiplier as

a) 2, 102

b) 3, 103

c) 1, 10

d) 0, 1

Ans: c) 1, 10

26) The resistor having number and multiplier as 2, 102 respectively is

a) Black in colour

b) Brown in colour

c) Red in colour

d) Blue in colour

Ans: c) red in colour

27) The resistor having number and multiplier as 3 and 103 respectively is

a) Brown in colour

b) Red in colour

c) Orange in colour

d) Yellow in colour

Ans: c) orange in colour

28) The resistor having number and multiplier as 4, 104 respectively is

a) Orange in colour

b) Red in colour

c) Blue in colour

d) Yellow in colour

Ans: d) yellow in colour

29) The resistor having number and multiplier as 5 and 105 respectively is

a) Yellow in colour

b) Orange in colour

c) Blue in colour

d) Green in colour

Ans: d) green in colour

30) Gold has tolerance % as

a) 5

b) 10

c) 15

d) 20

Ans: a) 5

31) Silver has tolerance% as

a) 5

b) 10

c) 20

d) 15

Ans: b) 10

32) The first two bands front the end indicate the ____ of the resistance in ohm.

a) First one significant figure

b) First two significant figures

c) First three significant figures

d) None

Ans: b) first two significant figures

33) The third band from the end indicate the

a) First two significant figures

b) First three significant figures

c) The decimal multiplier

d) None

Ans: c) the decimal multiplier

34) If the band’s present of the resistor are orange blue yellow and gold then the value of the resistance is

a) 36*103 ohm with a tolerance 10%

b) 36*104 ohm with a tolerance 5%

c) 36*104 ohm with a tolerance 10%

d) None

Ans: b) 36*104 ohm with a tolerance of 5%

35) The temperature coefficient of resistivity is _____ for metals

a) Negative

b) Zero

c) Positive

d) None

Ans: c) positive

36) The temperature coefficient of resistivity is positive for

a) Insulators

b) Non metals

c) Metals

d) None

Ans: c) metals

37) In case of metals, resistivity increases with

a) Increase in temperature

b) Decrease in temperature

c) Remains same

d) None

Ans: a) increases with temperature

38) The energy dissipated per unit time is called as

a) Work done

b) Power

c) Resistance

d) Current

Ans: b) power

39) The power in terms of V and I is given by

a) P = V/I

b) P = I/V

c) P = VI

d) None

Ans: c) P = VI

40) If the resistor R1 and R2 connected in parallel then their effective resistance is

a) 1/R = 1/R1 – 1/R2

b) 1/R = 1/R1 + 1/R2

c) R = R1 + R2

d) R = R1 – R2

Ans: b) 1/R= 1/R1 + 1/R2

41) The effective resistance in case of parallel combination of resistors

a) Decreases than individual resistance

b) Increases than individual resistance

c) Remains same

d) Becomes zero

Ans: a) decreases than individual resistance

42) The household appliances are connected in

a) Series combination

b) Parallel combination

c) Both a and b

d) None

Ans: b) parallel combination

43) In parallel combination of resistors the voltage across each resistor remains

a) Different

b) Zero

c) Constant

d) None

Ans: c) constant

44) In parallel combination of resistors which of the following quantity remains same

a) Voltage

b) Current

c) Resistance

d) Effective resistance

Ans: a) voltage

45) If resistors R1 and R2 are connected in series then their effective resistance is

a) R = R1 – R2

b) R = R1 + R2

c) 1/R = 1/R1 + 1/R2

d) 1/R = 1/R1 – 1/R2

Ans: b) R = R1 + R2

46) The effective resistance in series combination of resistors

a) Decreases than individual resistance

b) Increases than individual resistance

c) Remains same

d) None

Ans: b) increases than individual resistance

47) The quantity which remains constant in series combination of resistors is

a) Voltage

b) Current

c) Resistance

d) None

Ans: b) current

48) Current is the quantity which is flowing through the circuit remains same in case of

a) Parallel combination of resistors

b) Series combination of resistors

c) Both a and b

d) Non

Ans: b) series combination of resistors

49) The electrolyte through which a current flows has a finite resistance r, called

a) Resistance

b) External resistance

c) Internal resistance

d) Effective resistance

Ans: c) internal resistance

50) Atmospheric electricity arises due to the

a) Attraction of charges

b) Separation of charges

c) Both a and b

d) None

Ans: b) separation of charges

51) The equivalent emf of a series combination of n cells is the

a) Difference of their individual emfs

b) Sum of their individual emfs

c) Both a and b

d) None

Ans: b) sum of their individual emfs

52) The equivalent internal resistance of a series combination of n cells is the

a) Sum of their internal resistance

b) Difference of their internal resistance

c) Both a and b

d) None

Ans: a) sum of their internal resistance

53) At any junction the sum of the currents entering the junction is equal to the

a) Difference of currents leaving the junction

b) Sum of currents leaving the junction

c) Both a and b

d) None

Ans: b) sum of currents leaving the junction

54) At any junction, the sum of currents entering the junction is equal to the sum of currents leaving the junction, this is the

a) Loop rule

b) Junction rule

c) Both a and b

d) None

Ans: b) junction rule

55) The algebraic sum of changes in potential around any closed loop involving resistors and cells in  the loop is

a) Infinity

b) Constant

c) Zero

d) None

Ans: c) zero

56) The algebraic sum of changes in potential around any closed loop involving resistor and cells in the loop is zero, this is the

a) Junction rule

b) Loop rule

c) Both a and b

d) None

Ans: b) loop rule

57) Galvanometer is the device used to detect

a) Voltage

b) Resistance

c) Current

d) None

Ans: c) current

58) The fractional increase in resistivity per unit increase in temperature is called as

a) Temperature coefficient of resistivity

b) Temperature coefficient of current

c) Both a and b

d) None

Ans: a) temperature coefficient of resistivity

59) According to Ohm’s law V depends on I

a) Linearly

b) Non linearly

c) Both a and b

d) None

60) Ans: a) linearly

61) The potentiometer is the devise used to

a) Measure potential difference

b) Compare potential differences

c) Measure electric current

d) Measure electrical resistance

Ans; b) compare potential differences

62) The device used to compare potential differences is called as

a) Voltmeter

b) Ammeter

c) Galvanometer

d) Potentiometer

Ans: d) potentiometer

63) Electromotive force is measured in

a) N

b) C

c) V

d) A

Ans: c) V

64) Resistance is measured in

a) C

b) V

c) A

d) Ohm

Ans: d) ohm

65) Electric field is measured in

a) Vm

b) V/m

c) V

d) None

Ans: b) V/m

66) Drift velocity is measured in

a) M/s

b) M/S2

c) A

d) C

Ans: b) m/S2

 

67) Mobility is measured in

a) m2/ V s

b) V/m

c) V

d) J

Ans: a) m2 / V s

68) The dimensions of charge are

a) [T-1 A-1]

b) [T A]

c) [T A-1]

d) NONE

Ans: b) [T A]

69) Kirchhoff’s junction rule is based on the

a) Conservation of energy

b) Conservation of charge

c) Both a and b

d) None

Ans: b) conservation of charge

70) The dimensions of drift speed are

a) [L T]

b) [L T-1]

c) [L-1 T-1]

d) None

Ans: b) [L T-1]

71) The dimensions of current density are

a) [L-1 A]

b) [L-1 A-1]

c) [L-2 A]

d) None

Ans: c) [L-2 A]

Updated: April 12, 2023 — 10:25 am

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