You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect__________?
(A) two in parallel
(B) two in parallel and one in series
(C) three in parallel
(D) three in series
Which of the following material has nearly zero temperature co-efficient of resistance_________?
(A) Manganin
(B) Porcelain
(C) Carbon
(D) Copper
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
A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________?
(A) 6.4 A, 6.9 A
(B) 6.4 A, 9.6 A
(C) 4.6 A, 6.9 A
(D) 4.6 A, 9.6 A
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?
(A) 100 Ω
(B) 200 Ω
(C) 300 Ω
(D) 400 Ω
The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?
(A) 18 Q
(B) 36 Q
(C) 48 Q
(D) 64 Q
A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?
(A) 400 Q
(B) 600 Q
(C) 800 Q
(D) 1000 Q
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
Insulating materials have the function of___________?
(A) preventing a short circuit between conducting wires
(B) preventing an open circuit between the voltage source and the load
(C) conducting very large currents
(D) storing very high currents
Insulating materials have the function of______________?
(A) preventing a short circuit between conducting wires
(B) preventing an open circuit between the voltage source and the load
(C) conducting very large currents
(D) storing very high currents