With rise in temperature the resistance of semi-conductors __________?
A. decreases
B. increases
C. first increases and then decreases
D. remains constant
Category: Current Electricity Mcqs
Current velocity through a copper conductor is __________?
A. the same as propagation velocity of electric energy
B. independent of current strength
C. of the order of a few ^.s/m
D. nearly 3 x 108 m/s
With rise in temperature the resistance of pure metals __________?
A. increases
B. decreases
C. first increases and then decreases
D. remains constant
Two resistors are said to be connected in series when __________?
A. same current passes in turn through both
B. both carry the same value of current
C. total current equals the sum of branch currents
D. sum of IR drops equals the applied e.m.f.
In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is __________?
A. 33 V
B. 66 v
C. 80 V
D. 132 V
The property of a conductor due to which it passes current is called __________?
A. resistance
B. reluctance
C. conductance
D. inductance
Which of the following statement is true both for a series and a parallel D. C. circuit?
A. Elements have individual currents
B. Currents are additive
C. Voltages are additive
D. Power are additive
Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is __________?
A. 5 ohms
B. 10 ohms
C. 15 ohms
D. 55 ohms
Out of the following which is not a poor conductor?
A. Cast iron
B. Copper
C. Carbon
D. Tungsten
Conductance is reciprocal of __________?
A. resistance
B. inductance
C. reluctance
D. capacitance
