Basic electrical_Mcq Questions

1. The condition for ohm's law is that--

A) The temperature should remain constant
B) Ratio of V/I should be constant
C) The temperature should vary
D) Current should be proportional to voltage

Answer is A)
The temperature should remain constant

2. In a parallel circuit ,the potential difference across the resistance_________

A) Varies
B) Is different from the applied voltage
C) Is always Constant
D) None of this

Answer is C)
Is always Constant

3. What is an electromotive force ?

A) The torque produced by a motor
B) The force experienced by an electromagnet
C) The force with which the current carrying conductors attract or repel each other
D) The voltage produced by a voltage source

Answer is D)
The voltage produced by a voltage source.

4. Cells are connected in series in order to______.

A) Increase the current rating
B) Increase the voltage rating
C) Increase the life of the cells
D) None of these

Answer is B)
Increase the voltage rating

5. Which of the following is not a nonlinear circuit element ?

A) Diode
B) Transistor
C) Heater coil
D) None of these

Answer is C)
Heater coil

6. For the same peak value of voltage,which wave form will have the least rms value?

A) Sine wave
B) Triangular wave
C) Square wave
D) None of these

Answer is B)
Triangular wave

7. A current is said to be direct current when its________.

A) Magnitude remains constant with time
B) Magnitude changes with time
C) Direction changes with time
D) Magnitude & direction changes with time

Answer is A)
Magnitude remains constant with time

8. If the number of branches in a network is B ,number of nodes is N and number of dependent loop is L, then the number of independent node will be

A) N+L-1
B) B-1
C) B-N
D) N-1

Answer is D)
N-1

9. A dependent source________.

A) may be a current source or a voltage source
B) is always a voltage source
C) is always a current source
D) neither a current nor a voltage source

Answer is A)
may be a current source or a voltage source

10. Ohm's law is applicable to--

A) Semiconductors.
B) Vacuum tubes.
C) Electrolytes.
D) None of these.

Answer is D)
None of these.

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