Basic Electrical Mcqs

When one leg of parallel circuit is opened out the total current will______________?

A. reduce
B. increase
C. decrease
D. become zero

It becomes more difficult to remove_________________?

A. any electron from the orbit
B. first electron from the orbit
C. second electron from the orbit
D. third electron from the orbit

Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?

A. Reactor
B. Capacitor
C. Inductor
D. Resistor

A glass rod when rubbed with silk cloth is charged because__________?

A. it takes in proton
B. its atoms are removed
C. it gives away electrons
D. it gives away positive charge

Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?

A. 4 : 25
B. 25 : 4
C. 2 : 5
D. 5 : 2

When electric current passes through a metallic conductor, its temperature rises. This is due to__________?

A. collisions between conduction electrons and atoms
B. the release of conduction electrons from parent atoms
C. mutual collisions between metal atoms
D. mutual collisions between conducting electrons

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
E. Ratio of output to input

Resistance of a material always decreases if___________?

A. temperature of material is decreased
B. temperature of material is increased
C. number of free electrons available become more
D. none of the above is correct

A. magnetic effect
B. luminous effect
C. thermal effect
D. chemical effect
E. all above effects

An electric filament bulb can be worked from____________?

A. D. C. supply only
B. A. C. supply only
C. Battery supply only
D. All above