Entry Test MCQ :: Current Electricity

1.  The current through a metallic conductor is due to the motion of
A. free electrons B. protons
C. neutrons D. still under controversy

2.  Resistance of a conductor depends upon
A. nature of conductor B. dimension of conductor
C. physical state of the conductor D. all of above

3.  A wire having very high value of conductance is said to be
A. very good conductor B. moderately good conductor
C. an insulator D. no specific criterion available

4.  A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part
A. remains the same B. is doubled
C. is halved D. becomes zero

5.  Production of heat due to an electric current flowing through a conductor is given by
A. Joule effect B. Joule Thomsons effect
C. Comptons effect D. Feed back effect

6.  When same current passes for same time through a thick and thin wire
A. more heat is produced in thick wire B. more heat is produced in thin wire
C. no heat is produced in wire D. less heat is produced in thick wire

7.  Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f?
A. 40 W B. 90W
C. 100W D. 120W

8.  One kilowatt hour is the amount of energy delivered during
A. one second B. one day
C. one minute D. one hour

9.  Thermocouples convert
A. heat energy into electrical energy B. heat energy into light energy
C. heat energy into mechanical energy D. mechanical energy into heat energy

10.  How much heat does a 40 W bulb generates in one hour?
A. 144000J B. 144J
C. 1.44J D. 14J

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