Electric Current (Drift Velocity, Mobility and their Relation with Electric Current) NEET Questions

Physics - Current Electricity

Electric Current (Drift Velocity, Mobility and their Relation with Electric Current) MCQ Questions


13.
The relation between drift velocity (vd) and current (I) for a wire of length L, area A, and charge e is:
A.
vd = I / (nL)
B.
vd = nAeI
C.
vd = I / (eA)
D.
vd = I / (nAe)
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ANSWER :
D. vd = I / (nAe)
14.
Mobility of electrons in a conductor depends on:
A.
Temperature and electric field
B.
Only electric field
C.
Material of conductor and temperature
D.
Length of conductor
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ANSWER :
C. Material of conductor and temperature
15.
The electric current through a conductor is directly proportional to:
A.
Drift velocity
B.
Resistance
C.
Temperature
D.
Potential energy
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ANSWER :
A. Drift velocity
16.
The drift velocity of electrons increases when:
A.
Cross-sectional area decreases
B.
Temperature increases
C.
Electric field increases
D.
Charge on electron increases
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ANSWER :
C. Electric field increases
17.
What happens to the drift velocity if the number of charge carriers is doubled while keeping the current constant?
A.
Halves
B.
Doubles
C.
Remains the same
D.
Becomes zero
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ANSWER :
A. Halves
18.
In a conductor, the electrons move:
A.
Against the electric field
B.
In the direction of electric field
C.
Randomly without any net flow
D.
Opposite to the conventional current
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ANSWER :
D. Opposite to the conventional current