# 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%

• T1 > T2
• T1 ≈ T2
• T1 = T2
• T1 < T2

T1 > T2

• 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

• 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

• 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)

• 32 V
• 48 V
• 24 V
• 14 V

48 V

• 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: November 15, 2022 — 2:28 pm