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Objective Type Question and Answers On Class 12 Physics Chapter 3 Current Electricity

Questions
1 A galvanometer acting as a volt meter will have with its coil.
A a high resistance in parallel
B a high resistance in series
C a low resistance in parallel
D a low resistance in series

Answer:a high resistance in series
2 The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
A resistance will be doubled and specific resistance will be halved
B resistance will be halved and specific resistance will remain uncharged
C resistance will be halved and the specific resistance will be doubled
D resistance and specific resistance will both remain uncharged

Answer:resistance will be halved and specific resistance will remain uncharged
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3 Ohm’s law is valid when the temperature of conductor is :
A very low
B very high
C varying
D constant

Answer:constant
4 n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to
A n²R
B R/n²
C R/n
D nR

Answer:n²R
5 Emf is measured in :
A joule
B joule/coulomb
C joule-coulombs
D joule/coulomb/metre

Answer:joule/coulomb
6 A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :
A 20 A
B 5 A
C 0.2 A
D None of these

Answer:20 A
7 The temperature coefficient of resistance is expressed in :
A °C
B °C-1
C m°C-1
D None of these

Answer:°C-1
8 1 kilowatt hour is commonly known as :
A unit
B 1 faraday
C 1 curie
D None of these

Answer:unit
9 In an experiment with potentiometer, null point with a cell is found at 240 cm. When the cell is shunted with a resistance 2 Ω, the null point becomes 120 cm internal resistance of cell is :
A 4 Ω
B 2 Ω
C 1 Ω
D 1/2 Ω

Answer:2/Ω
10 The phenomenon of super-conductivity was discovered by :
A Ohm
B Onnes
C Edison
D None of these

Answer:Onnes
11 Copper wire is used as connecting wire because :
A copper has high electrical resistivity
B copper has low electrical resistivity
C copper has low electrical conductivity
D copper has high value of elasticity

Answer:copper has low electrical resistivity
12 A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :
A 2/3 Ω
B 3/2 Ω
C 1/2 Ω
D 1/3 Ω

Answer:2/3 Ω
13 The example of a non-ohmic resistance is:
A copper wire
B fi lament lamp
C carbon resistor
D diode

Answer:diode
14 How many different resistances are possible with two equal resistors?
A 2
B 3
C 4
D 5

Answer:3
15 The speed at which tjie current travels in a conductor is nearly:
A 3 × 104 ms-1
B 3 × 106 ms-1
C 3 × 108 ms-1
D 3 × 1010 ms-1

Answer:3 × 104 ms-1
16 The heat sensitive device whose resistivity changes very rapidly with change of temperature is called a :
A resistor
B super-conductor
C thermocouple
D thermistor

Answer:thermistor
17 In following figure shows currents in a part of electrical circuit, then the value of/(in ampere) is given by :

Class 12 Physics Chapter 3 Current Electricity

A 0.3 A
B 0.5 A
C 1.3 A
D None of these

Answer:0.3 A
18 An electric heating element consumes 500 W, when connected to a 100 V line. If the line voltage becomes 150 V, the power consumed Will be:
A 500 W
B 750 W
C 1000 W
D 1125 W

Answer:750 W
19 A uniform w ire connected across a supply produces heat H per second. If wire is cut into three equal parts and all the parts are connected in parallel across the same supply, the heat produced per second will be :
A H/9
B 9 H
C 3 H
D H/3

Answer:H/3

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