MCQ Theory Test on Current Electricity - Set 07 - ObjectiveBooks

# Practice Test: Question Set - 07

1. Voltage dependent resistors are used
(A) For inductive circuits
(B) To suppress surges
(C) As heating elements
(D) As current stabilizers

2. If I, R and t are the current, resistance and time respectively, then according to Joule's law heat produced will be proportional to
(A) I2Rt
(B) I2Rf
(C) I2R2t
(D) I2R2t2

3. Which one of the following does not have negative temperature coefficient?
(A) Aluminium
(B) Paper
(C) Rubber
(D) Mica

4. Electric pressure is also called
(A) Resistance
(B) Power
(C) Voltage
(D) Energy

5. With rise in temperature the resistance of semiconductors
(A) Decreases
(B) Increases
(C) First increases and then decreases
(D) Remains constant

6. Ohm's law is not applicable to
(A) Vacuum tubes
(B) Carbon resistors
(C) High voltage circuits
(D) Circuits with low current densities

7. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true?
(A) The current through each bulb in same
(B) The voltage across each bulb is not same
(C) The power dissipation in each bulb is not same
(D) None of the above

8. If the efficiency of a machine is to be high, what should be low?
(A) Input power
(B) Losses
(C) True component of power
(D) kWh consumed

9. Resistance of 220 V, 100 W lamp will be
(A) 4.84 Q
(B) 48.4 Q
(C) 484 ft
(D) 4840 Q

10. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners?
(A) 3/2 Q
(B) 6 Q
(C) 4 Q
(D) 8/3 Q

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