# Revise your knowledge in electricity and electrical measurements Online Test

With rises the temperature, resistance of carbon____.
increases
decreases
remains the same
first increases then decreases
With rises the temperature, resistance of a semiconductor material germanium or silicon) _____________.
increases
decreases
remains the same
first increases then decreases
In the Bohr’s model of hydrogen atom, the electron moves around the nucleus in a circular orbit of radius 5x 10-11 meters. If its time period is 1.2 x 10-16 s, then current associated with the electron motion is ____,
zero
1.6 x 10-19 A
0.17 A
1.07 X 10-3 A
Two identical heater coils are connected in parallel across the mains. If one of the coils breaks, then other coil ____.
will also not be heated
develop a higher temperature
develop a lower temperature
will develop the same amount
A potentiometer wire, 10 m long has resistance 40 ohms. If it is put in series to a resistance 760 ohms and connected to a 2 volts battery, then potential gradient in the wire is ____.
1 x 10-2 volt/m
1 x 10-3 volt/m
1 x 10-4 volt/m
1 x 10-5 volt/m
If a resistance 5 is connected in the left gap of a meter bridge and 15 in the other gap then position of balancing point is
10 cm
20 cm
25 cm
75 cm
A current of 5 amperes is passing through a metallic wire of cross-section area 4 x 10-6 m2. If the density of the charge carrier in the wire is 5 x 1026/m3, the drift velocity of the electrons is ____.
1/8 m/s
1/16 m/s
1/64 m/s
1/78 m/s
In comparing e.m.f two cells with the help of a potentiometer, at the balance point, the current flowing through the wire is taken from ____.
one of these cells
both of these cells
the battery in the circuit
none of these
For which of the following, dependence of drift velocity vd on electric field E is Ohm’s law obeyed?
The terminal potential difference of a cell is greater than its e.m.f. when it is ____.
being discharged
in open circuit
being charged
being either charged or discharged
Description:

Tppics included are temperature of resistance,e.m.f, p.d,drift velocity,potentiometer ,heating effect of current, metre bridge

Discussion
Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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