1. The current through a metallic conductor is due to the motion of
A. Free Electrons
B. Protons
C. Neutrons
D. Still under controversy
✅ The correct answer is option A.
Current Electricity MCQs
2. The resistance of a conductor depends upon
A. Nature of the conductor
B. The dimension of the conductor
C. The physical state of the conductor
D. All of above
✅ The correct answer is option D.
3. A wire having a 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
✅ The correct answer is option A.
4. A wire of uniform area of cross-section A length L and resistance R is cut into two parts. The resistivity of each part
A. Remains the same
B. Is doubled
C. Is halved
D. Becomes zero
✅ The correct answer is option A.
5. Production of heat due to an electric current flowing through a conductor is given by
A. Joule effect
B. t B. Joule Thomsons effect
C. Compton effect
D. Feedback effect
✅ The correct answer is option A.
6. When the same current passes for the same time through a thick and thin wire
A. More heat is produced in a thick wire
B. More heat is produced in a thin wire
C. No heat is produced in the wire
D. Less heat is produced in a thick wire
✅ The correct answer is option B.
7. Three equal resistors connected in series with a source of emf 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 emf?
A. 40 W
B. 90W
C. 100W
D. 120W
✅ The correct answer is option B.
8. One kilowatt-hour is the amount of energy delivered during
A. One second
B. One day
C. One minute
D. One hour
✅ The correct answer is option D.
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
✅ The correct answer is option A.
10. How much heat does a 40 W bulb generates in one hour?
A. 144000J
B. 144J
C. 1.44J
D. 14J
✅ The correct answer is option A.