1. The resistance of a conductor depends on
a) the potential difference across its ends.
b) the current through the conductor.
c) geometry of the conductor
d) none of these
2. A wire of length L and resistance R is cut into two equal
halves. The resistance of the wire of length L/2 will be
a) R/2
b) 2R
c) R/4
d) 4R
3. Individual electrons in a metal under the influence of
electric field
a) move in a zig- zag but straight-line path
b) move in a zig-zag but curved path
c) move in straight line in the direction of electric field
d) move in straight line in the direction opposite to
electric field
4. In the phrase " drift velocity of electrons in
metal" , drift velocity means
a) average velocity of all electrons crossing a given
cross-section area in a metal
b) distance traveled by an individual electrons per unit
time
c) distance traveled by a group of electrons crossing a
given perpendicular area per unit time
d) none of these
5. The mobility of electrons in a metal is independent of
a) electric field
b) drift velocity
c) potential difference
d) all of the above
6. Resistivity of a semiconductor
a) increases with temperature.
b) decreases with temperature.
c) remains constant with temperature.
d) first remains constant for smaller change in temperature
and then decreases with temperature
7. Three resistors of resistances R, 2R and 3R are connected
in series. The potential differences between the resistors will be in the ratio
a) 1:1:1
b) 1:2:3
c) 3:2:1
d) 1:4:9
8. EMF of a cell is
a) the force applied to charges inside cells during chemical
reaction.
b) the maximum potential difference between the terminals of
the cell in open circuit condition
c) the potential difference offered by cell during the drift
motion of electrons in the circuit
d) work done by cell to move electrons in the circuit.
9. Two equal resistors are connected first in series and
then in parallel to the same battery. The power consumed in the two cases
a) would be equal.
b) would be more for series connection.
c) would be more for parallel connection.
10. Potentiometer is a device which is used to measure
a) emf of a cell
b) internal resistance of a cell
c) potential difference across a cell
d) all of the above
