# 12th Physics Unit 13 Chapter Wise Past Papers MCQs

12th Physics unit 13 current electricity MCQs from past papers of Inter Boards. Answer keys are provided with these MCQs. Inter part 2 Lahore Board Past papers MCQs. Inter part 2 Faisalabad Board past papers MCQs.

## 12th Physics Unit 13 Current Electricity MCQs:

SAMPLE MCQS FROM UNIT 13 2ND YEAR PHYSICS

A wire of uniform area of cross-section A, length L and resistance R is cut into two equal
parts. The resistivity of each part.
(D) is oine-fourth
B) remains the same
(C) is halved
(A) is doubled

The unit of temperature co-efficieot of resistivity is. (DGK. GI, 2014) (DGK. GII, 2016MAJK. GI, 2015)
(Β) Ωιη
(D) K

The reciprocal of resistance is called: (DGK. GII, 2015) (SGD. GI, 2018)
(A) Capacitance
(B) Resistance
(D) Inductance

ohm.m’ is the Unit of: (BWP. GI, 2014) (LFIR. GI, 2018)
(A) Resistance
(B) Resistivity
(C) Conductance
D) Conductivity

The specific resistance of a material depends upon (LHR. GI, 2015)
(A) Length
(B) Area
(C) Temperature
D) Both A&B

### 2nd Year Physics Current Electricity MCQs

Good conductors have conductivities of the order of: (FBD. GI, 2014) (SGD. GII, 2016)
(A) 10-12m-
B’ 10’Sm’
(C) 102 sm-
(D) 10-22m-

The SI Unit of resistivity is: (SWL. GI, 2014)
(Β) Ωm-
(C) Ωm
(D) 2

When a wire of resistance R is cut in two equal parts its resistance becomes R2 what
happens to resistivity: (MLN. GI, 2014)
(A) Double
(B) Same
(C) Half
(D) One fourth

Which one has negative temperature co-efficient of resistance? (GRW. GI, 2016)
(A) Silver
(B) Gold
(C) Carbon
(D) Steal

Temperature coefficient of resistance (oC) is equal: (SGD. GI, 2016)
(A) R, +R
(B) R.AT
R.Δε
(D) None of these

A rheostat can operate as: (RWP. GII, 2017)
(A) Amplifier
(B) Potential divider
(C) Oscillator
(D) Transformer

Heat sensitive resistors are called: (FBD. GI, 2017)
(A) Resistors
(B) Capacitor
(C) Thermistors
(D) Inductors

Colour codes are used to calculate the: (LHR. GI, 2014)
(A) Nature of resistor
(B) Numerical value of resistance
(C) potential difference
(D) Current

Resistivity at a given temperature depends upon: (LHR. GII, 2014)
(A) Area of cross section
(B) length
(C) Nature of material of conductor
(D) Both length and Area

A substance having the negative temperature coefficient of resistivity out of the following is:
(LHR. GI, 2015) (BWP. GII, 2017)
A) Carbon
(B) Iron
(D) Gold

Resistance tolerance for gold colour is: (MLN. GII, 2016) (LHR. GII, 2018)
(A) 50%
(B) 30%
(C). 20%
(D) 5%

If the fourth band is missing on resistance, its tolerance is: (SWL. GI, 2016)
(A) +5%
(B) +10%
(C) +15%
(D) +20%