Questions and Answers related to current 2 | Electrical Questions
This article provides MCQ type questions and answers related to current which is more helpful to increase your basic knowledge about electricity
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| Questions and Answers related to current 2 | Electrical Questions |
Questions and Answers
Q.1. In an electric kettle water boils in 10
minutes. It is required to boil the boiler
in 15 minutes, using same supply
mains
(a)length of heating element should be
decreased
(b)length of heating element should be
increased
(c)length of heating element has no
effect on heating if water
(d)none of the above
Ans.
(a)length of heating element should be
decreased
Q.2. An electric filament bulb can be worked
from
(a)D.C. supply only
(6)A.C. supply only
(c)Battery supply only
(d)All above
Ans.
(d)All above
Q.3. Resistance of a tungsten lamp......as
applied voltage increases
(a)decreases
(b)increases
(c)remains same
(d)none of the above
Ans.
(b)increases
Q.4. Electric current passing through the
circuit produces
(a)magnetic effect
(b)luminous effect
(c)thermal effect
(d)chemical effect
(e)all above effects
Ans.
(e)all above effects
Q.5 Resistance of a material always
decreases if
(a)temperature of material is de-
creased
(b)temperature of material is in-
creased
(c)number of free electrons available
become more
(d)none of the above is correct
Ans.
(c)number of free electrons available
become more
Q.6. 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
Ans.
(b)Losses
Q.7. When electric current passes through a
metallic conductor, its temperature
rises. This is due to
(a)collisions between conduction elect-
rons and atoms
(b)the release of conduction electrons
from parent atoms
(c)mutual collisions between metal
atoms
(d)mutual collisions between conduct-
ing electrons
Ans.
(a)collisions between conduction elect-
rons and atoms
Q.8. 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
Ans.
(c)2:5
Q.9. 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
Ans.
(c)it gives away electrons
Q.10. Whether circuit may be A.C. or D.C.
one, following is most effective in reduc-
ing the magnitude of the current.
(a)Reactor
(b)Capacitor
(c)Inductor
(d)Resistor
Ans.
(d)Resistor
Q.11. 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
Ans.
(d)third electron from the orbit
Q.12. When one leg of parallel circuit is
ppened out the total current will
(a)reduce
(b)increase
(c)decrease
(d)become zero
Ans.
(c)decrease
Q.13. In a lamp load when more than one
/lamp are switched on the total resis-
tance of the load
(a)increases
(b)decreases
(c)remains same
(d)none of the above
Ans.
(b)decreases
Q.14. Two lamps 100 W and 40 W are con-
nected in series across 230 V(alternat-
ing).Which of the following statement
is correct?
(a)100 W lamp will glow brighter
(b)40 W lamp will glow brighter
(c)Both lamps will glow equally bright
(d)40 W lamp will fuse
Ans.
(b)40 W lamp will glow brighter
Q.15. Resistance of 220 V,100 W lamp will
be
(a)4.848
(b)48.48
(c)484
(d)4840
Ans.
(c)484
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