Physics
Current electricity
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#25 The meter bridge is based on the principle of
A) Potentiometer
B) Wheatstone bridge
C) Ohm's law
D) Kirchhoff's law
#26 The sensitivity of a potentiometer can be increased by
A) Increasing the length of the wire
B) Decreasing the potential gradient
C) Both A and B
D) Neither A nor B
#27 The potential gradient along the potentiometer wire can be decreased by
A) Increasing the length of the wire
B) Decreasing the current in the wire
C) Both A and B
D) Neither A nor B
#28 The thermistor is a device whose resistance
A) Increases with temperature
B) Decreases with temperature
C) Remains constant with temperature
D) First increases then decreases
#29 The superconductor is a material whose resistance
A) Becomes zero below a critical temperature
B) Becomes infinite below a critical temperature
C) Remains constant below a critical temperature
D) Increases below a critical temperature
#30 The drift velocity of electrons in a conductor is of the order of
A) $10^{-3} m/s$
B) $10^{-5} m/s$
C) $10^{-7} m/s$
D) $10^{-9} m/s$
#31 The mobility of charge carriers is defined as
A) Drift velocity per unit electric field
B) Electric field per unit drift velocity
C) Charge per unit mass
D) Mass per unit charge
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