# PHYSICS: ELECTRICITY Online Test

The resistance of a straight conductor depends on its
Temperature
Length
Material
All of the above
The potentiometer is a device used for accurate comparison of_______
Voltages
Currents
Potential difference
Electrical energy
Electrical circuits containing simple arrangements of resistances in series or in parallel and with a know source of e.m.f. can be analysed in a straight forward manner by
Kirchhoff’s law
Lenz’s law
Ohm’s law
Ampere’s law
According to Kirchhoff’s IInd law, the algebraic sum of e.m.f.’s in any loop of the network is equal to
Zero
The algebraic sum of the IR products
The algebraic sum of the VR products
The algebraic sum of the VI products
A resistance of 2( is connected across one gap of a metrebridge (the length of the wire is 100 cm) and an unknown gap. When these resistances are interchanged, the balance point shift by 20 cm. Neglecting any corrections, the unknown resistance is
3(
4(
5(
6(
Read the following statements carefully: Y : The resistively of a semiconductor decreases with increases of temperature. Z: In a conducing solid, the rate of collisions between free electrons and ions increases with increases of temperature Select the correct statement (s) from the following:
Y is true but Z is false
Y is false but Z is true
Both Y and Z are true
Is true and Z is the
A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed is doubled if
Both the length and the radius of the wire are halved.
Both the length and the radius of the wire are doubled
The radius of the wire is doubled
The length of the wire is doubled
The temperature coefficient of resistance of a wire is 0.00125 peroC. At 300 k, its resistance is I ohm. This resistance of the wire will be 2 ohm at.
1154oK
1100oK
1400oK
1127oK
A piece of copper and another of germanium are cooled from room temperature to 80oK. The resistance of
Each of them increases
Each of them decreases
Copper increases and germanium decreases
Copper decreases and germanium increases
The charge on an electron being 1.6 x 1019 coulomb, current flowing in a circuit is 1 A. What would be the number of electrons flowing through the circuit in 1 sec?
1.6 x 1019
1.6 x 10-19
0.625 X 1019
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Questions are from potentiometer, resistivity etc

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