# Physics 12 Current Electricity MCQ Question Answer – Chapter 3

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CBSE and NCERT Physics 12 Current Electricity MCQ Question Answer – Chapter 3, current electricity is 3 third chapter and or physics class 12th, All the questions related to the UNIT 2 Current electricity are given here. If you want solution for NCERT Physics then you can check this link below.

In 2nd UNIT, Current Electricity there is only one chapter included in it. See chapter one and 2 MCQs here

## Physics 12 Current Electricity MCQ Question Answer – Chapter 3

#### Ques 1: Drift velocity vd varies with the intensity of electric field E as per the relation

• vd ∝ E
• vd ∝ 1/E
• vd = constant
• vd ∝ E2

vd ∝ E

• 3 × 10-9 Ω
• 3 × 10-7 Ω
• 3 × 10-5 Ω
• 3 × 10-3 Ω

3 × 10-7 Ω

• 1154 K
• 1100 K
• 1400 K
• 1127 K

1100 K

#### Ques 4: The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is

• 21 × 10-3 Ω ∓ 10%
• 23 × 101 Ω ∓ 10%
• 21 × 103 Ω ∓ 5%
• 12 × 103 Ω ∓ 5%

21 × 10-3 Ω ∓ 10%

#### Ques 5: The voltage V and current I graph for a conductor at two different temperatures T1 and T2 is • T1 > T2
• T1 ≈ T2
• T1 = T2
• T1 < T2

T1 > T2

#### Ques 6: From the graph between current I and voltage V as shown in identify the portion corresponding to negative resistance • AB
• BC
• CD
• DE

CD

#### Ques 7: The resistivity of alloys = Ralloy ; the resistivity of constituent metals = Rmetal. Then usually

• Ralloy = Rmetal
• Ralloy < Rmetal
• There is no simple relation between Ralloy and Rmetal
• Ralloy > Rmetal

Ralloy > Rmetal

• 1 : 3 : 5
• 5 : 3 : 1
• 1 : 15 : 125
• 125 : 15 : 1

125 : 15 : 1

• 1 : 2
• 8 : 1
• 1 : 8
• 1 : 1

1 : 1

• 1 : 4 : 9
• 9 : 4 : 1
• 1 : 2 : 3
• 27 : 6

27 : 6

## CBSE Physics 12 Current Electricity MCQ Question Answer

#### Ques 11: We use alloy for making resistors, because they have :

temp. coefficient Resistivity

• low low
• High low
• High low
• low high

High low

• 1 Ω
• 2 Ω/E
• 4 Ω
• 8 Ω

1 Ω

#### Ques 13: A cell of emf ε and internal resistance r is connected across external resistance R. the graph showing the variation of P.D. across R(i.e., V) versus R is

• • • •  • 2.0 Ω
• 1.5 Ω
• 1.0 Ω
• 0.5 Ω

0.5 Ω

• 54 × 10-3 J
• 54 × 10-6 J
• 54 × 10-9
• 54 × 10-12

54 × 10-6 J

#### Ques 16: WSB experiment is most sensitive, when:

• all four resistances are approximately equal
• one of the resistance is very high as compared to other
• one of the resistances is very low as compared to others
• Any two resistances are equal to infority

all four resistances are approximately equal

• R
• 2R
• R/2
• R/4

R

• 2 Ω
• 3 Ω
• 4 Ω/li>
• 2.5 Ω

3 Ω

• 1 Ω
• 0.5 Ω
• 1.2 Ω
• 2.5 Ω

0.5 Ω

• 3 : 5
• 5 : 3
• 3 : 4
• 4 : 3

5 : 3

### NCERT Physics Class 12 Current Electricity Multiple Choice Questions

• 30 mV/cm
• 10 mV/cm
• 20 mV/cm
• 4 mV/cm

10 mV/cm

• 1/4
• 4
• 3/2
• 3

3/2

• 1 Ω
• 2 Ω
• 4 Ω
• 6 Ω

6 Ω

• l/6
• l/2
• l/3
• 2l/3

l/2

• 10.5kJ
• 16.3 kJ
• 12.0 kJ
• 14.2 kJ

12.0 kJ

#### Ques 26: The current in the adjoing circuit will be : • 1/45 ampere
• 1/15 ampere
• 1/10 ampere
• 1/5 ampere

1/10 ampere

#### Ques 27: Two resistors of resistance R1 and R2 having R1 > R2 are connected in parallel. For equivalent resistance R, the correct statement is:

• R > R1 + R2
• R < R1 < R2
• R2 < R < (R1 + R2)
• R < R1

R < R1

#### Ques 28: Two wires of equal diameters of resistivity p1 and p2 and length l1 and l2 respectively, are joined in series. The equivalent resistivity of the combination is:

• p1 l1 + p2l2/(l1 + l2)
• p1l2 + p2l1/(l1 – l2)
• p1l2 + p2l1/(l1 + l2)
• p1 l1 – p2l2/(l1 – l2)

p1 l1 + p2l2/(l1 + l2)

#### Ques 29: The potential difference between A and B in the is: • 32 V
• 48 V
• 24 V
• 14 V

48 V

#### Ques 30: If the ammeter in the given circuit shown in the diagram reads 2 A, the resistance R is: • 1 Ω
• 2 Ω
• 3 Ω
• 4 Ω

1 Ω

## Physics Chapter Wise MCQ Questions and Answers Physics class 12 Current Electricity MCQ test online, for other subjects are also available.

Updated: September 11, 2022 — 4:39 pm