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


7.
Drift velocity is generally of the order of:
A.
10⁻⁴ m/s
B.
10⁸ m/s
C.
10⁶ m/s
D.
10² m/s
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ANSWER :
A. 10⁻⁴ m/s
8.
If the length of a conductor is doubled, keeping the potential difference constant, the drift velocity:
A.
Halves
B.
Doubles
C.
Remains the same
D.
Becomes zero
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ANSWER :
A. Halves
9.
Drift velocity of electrons in a conductor is directly proportional to:

NEET - 2020

A.
Current and inversely proportional to area
B.
Resistivity and inversely proportional to current
C.
Voltage and inversely proportional to resistance
D.
Temperature and inversely proportional to charge
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ANSWER :
A. Current and inversely proportional to area
10.
The SI unit of mobility is:
A.
m²/Vs
B.
m/s
C.
V/m
D.
Coulomb
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ANSWER :
A. m²/Vs
11.
The electric current is defined as:
A.
Potential difference per unit charge
B.
Rate of flow of charge
C.
Resistance per unit charge
D.
Power per unit charge
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ANSWER :
B. Rate of flow of charge
12.
If the drift velocity is 2 x 10⁻⁴ m/s and the electric field is 10 V/m, the mobility is:
A.
2 m²/Vs
B.
5 x 10⁴ m²/Vs
C.
2 x 10⁻⁵ m²/Vs
D.
0.2 m²/Vs
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ANSWER :
C. 2 x 10⁻⁵ m²/Vs