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
- In case you have missed:- Previous Chapter MCQ Questions
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]
- In case you have missed:- Next Chapter MCQ Questions