Multiple Choice Questions | Chapter 12 Current Electricity l Second Year Physics Part2 Urdu/Hindi

Описание: Each of the following questions is followed by four answers. Select the correct answer in each case.
Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?
A. 3RΩ B. 2R/4Ω C. R/3Ω D. 2R/3Ω
When n resistances each of value r are connected in parallel, then resultant resistance is x. when these n resistances are connected in series, total resistance is
A. nx B. rnx C. x/n D. n2x
Two bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
A. 33 watt B. 67 watt C. 100 watt D. 300 watt
Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohm is
A. r/2 B. 4r C. 2r D. r/4
〖10〗^6 electrons are moving through a wire per second, the current developed is
A. 1.6×〖10〗^(-19) A B. 1A C. 1.6×〖10〗^(-13) A D. 〖10〗^6 A
When a wire is stretched and its radius becomes r/2, then its resistance will be
A. 16R B. 4R C. 2R D. 0
How much voltage is required to make 2A flow through a resistance of 8Ω?
A. 16 AΩ-1 B. 16 Ω A-1 C. 16 AΩ D. A-1Ω-1
A wire of uninform cross-section A, length L and resistance R is cut into two equal parts. The resistivity of each part will be
A. doubled B. halved C. remains same D. one fourth
The resistivity of two wires is ρ_1 and ρ_2 which are connected in series. If there dimensions are same then the equivalent of the combination will be
A. (ρ_1+ρ_2) B. 1/ρ_1 +1/ρ_2 C. (ρ_1+ρ_2)/2 D. ρ_1/ρ_2
The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220V. The ratio of resistance of their filament will be
A. 1:2 B. 2:1 C. 1:3 D. 4:3
Thermocouple is an arrangement of two different metals
A. To convert heat energy into electrical energy B. To produce more heat
C. To convert heat energy into chemical energy D. To convert electric energy into heat energy
In order to achieve high accuracy, the slide wire of a potentiometer should be
A. As long as possible B. As short as possible C. Very thin D. Vey thick
When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is
A. high B. small C. ideally zero D. very high
In a Wheatstone bridge method, the bridge is said to be balanced, when the current through the galvanometer is
A. 1A B. 0A C. Maximum D. Half of the maximum value