A. collisions between conduction electrons and atoms
B. the release of conduction electrons from parent atoms
C. mutual collisions between metal atoms
D. mutual collisions between conducting electrons
Related Mcqs:
- Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?
A. 160 ohms
B. 80 ohms
C. 20 ohms
D. 10 ohms - The property of a conductor due to which it passes current is called___________?
A. resistance
B. reluctance
C. conductance
D. inductance - The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be
A. R Ω
B. 2R Ω
C. 4R Ω
D. 8R Ω - When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
A. A. C.
B. D. C.
C. any of above two
D. none of the above - 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 - The insulation on a current carrying conductor is provided__________?
A. to prevent leakage of current
B. to prevent shock
C. both of above factors
D. none of above factors - If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?
A. 0.4 ohm
B. 0.6 ohm
C. 0.8 ohm
D. 1.0 ohm - An instrument which detects electric current is known as_____________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometer - Electric current passing through the circuit produces_____________?
A. magnetic effect
B. luminous effect
C. thermal effect
D. chemical effect
E. all above effects - Ohm’s law is not applicable to__________?
A. semi-conductors
B. D. C. circuits
C. small resistors
D. high currents
