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Worksheetsphysics current
Total questions: 10
Worksheet time: 5mins
By increasing the temperature the resistance of a conductor
increases.
decreases.
remains constant.
initially increases then decreases.
A battery of emf V volts, resistance R1 & R2, a condenser C and switches S1 and S2 are connected in a circuit as shown in figure. The capacitor C gets fully charged to V volts when
S1 & S2 are both closed
S1 & S2 are both open
S1 closed and S2 open
S2 closed & S1 open.
The equivalent resistance of a circuit between A and B is
3 ohm
0
6 ohm
1.5 ohm
In the circuit shown in figure, the voltmeter reading would be
0 volt.
0.5 volt.
1 volt.
2 volt
The V-I graph for a conductor at temperatures T1 and T2 are as shown in the figure, (T2 – T1) is proportional to
cos 2θ
sin 2θ
cot2θ
tan 2θ
If a copper wire is stretched to make it 0.1 % longer. The percentage change in its resistance is
0.2% increase
0.2% decrease
0.1 % increase
0.1 % decrease
n the circuit shown in figure E1 = 7V, E2 = 7V R1 = R2 = 1 Ω and R3 = 3 Ω respectively. The current through the resistance R3 is
2A
3.5A
1.75A
none of these
A cell of e.m.f E and internal resistance r is connected across a resistance r. The potential difference between the terminals of the cell must be
E
E/2
E/4
3E/2
A conductor carries a current of 50mA if the area of cross-section of the conductor is 50 mm2 then value of the current density in Am-2 is
0.1
1
0.5
121
The drift velocity in the free electron is responsible for the?
production of electric current
None of these
power dissipation
production pf heat energy
