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


1.
The drift velocity of electrons in a conductor is proportional to:
A.
Potential difference
B.
Current squared
C.
Resistance
D.
Electric field
😑 View Answer Rough Work Error
ANSWER :
D. Electric field
2.
If 'I' is the current, 'n' is the number of electrons per unit volume, 'A' is the cross-sectional area, and 'e' is the charge of an electron, then drift velocity 'vd' is:
A.
IA / (ne)
B.
nAe / I
C.
Ie / (nA)
D.
I / (nAe)
😑 View Answer Rough Work Error
ANSWER :
D. I / (nAe)
3.
The mobility of charge carriers is defined as:
A.
Electric field per unit drift velocity
B.
Drift velocity per unit electric field
C.
Product of drift velocity and electric field
D.
Inverse of drift velocity
😑 View Answer Rough Work Error
ANSWER :
B. Drift velocity per unit electric field
4.
What is the relation between current 'I', drift velocity 'vd', and area of cross-section 'A'?
A.
I = vd / (nAe)
B.
I = nAe vd
C.
I = nA / (evd)
D.
I = n e / (Avd)
😑 View Answer Rough Work Error
ANSWER :
B. I = nAe vd
5.
Which of the following statements about mobility is correct?

NEET - 2018

A.
Increase in temperature increases mobility
B.
Increase in temperature decreases mobility
C.
Does not depend on temperature
D.
Has no effect on conductivity
😑 View Answer Rough Work Error
ANSWER :
B. Increase in temperature decreases mobility
6.
When the temperature of a conductor increases, the drift velocity:
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
😑 View Answer Rough Work Error
ANSWER :
B. Decreases