LEVEL – I
1. By increasing the temperature the resistance of a conductor
(C) remains constant.
(D) initially increases then decreases.
2. 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
(A) S1 & S2 are both closed
(B) S1 & S2 are both open
(C) S1 closed and S2 open
(D) S2 closed & S1 open.
3. The equivalent resistance of a circuit between A and B is
(A) 3 Ω
(C) 6 Ω
(D) 3/2 Ω
4. In the circuit shown in figure, the voltmeter reading would be
(A) 0 volt.
(B) 0.5 volt.
(C) 1 volt.
(D) 2 volt.
5. The V-I graph for a conductor at temperatures T1 and T2 are as shown in the figure, (T2 – T1) is proportional to
(A) cos 2θ
(B) sin 2θ
(D) tan 2θ
6. If a copper wire is stretched to make it 0.1 % longer. The percentage change in its resistance is
(A) 0.2 % increase
(B) 0.2% decrease
(C) 0.1 % increase
(D) 0.1 % decrease
7. In 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
(D) none of these
8. The figure shows in apart of an electric circuit, then the current I is
(A) 1 A
(C) 2 A
(D) 4 A
9. 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
10. 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
1. A 2. C 3. D 4. A 5. C 6. A 7. A 8. B 9. B 10. B