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Basic electricity
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Out of the following which is not a poor
conductor? Copper [other wrong options] [Discuss in forum] Cast iron Carbon Tungsten |
Q22 ⇒ The minimum charge on an ion is equal to the charge of an electron [other wrong options] [Discuss in forum] equal to the atomic number of the
atom equal to the charge of the number of electrons in an atom zero |
Q23 ⇒ In an electric kettle water boils in 10
mjnutes. It is required to boil the boiler
in 15 minutes, using same supply
mains length of heating element should be decreased [other wrong options] [Discuss in forum] length of heating element should be
increased length of heating element has no effect on heating if water none of the above |
Q24 ⇒ It becomes more difficult to remove third electron from the orbit [other wrong options] [Discuss in forum] any electron from the orbit first electron from the orbit second electron from the orbit |
Q25 ⇒ For testing appliances, the wattage of
test lamp should be high [other wrong options] [Discuss in forum] very low low any value |
Q26 ⇒ International ohm is defined in terms
of the resistance of a column of mercury [other wrong options] [Discuss in forum] a cube of carbon a cube of copper the unit length of wire |
Q27 ⇒ When current flows through heater coil
it glows butsupply wiring does not glow
because resistance of heater coil is more than the supply wires [other wrong options] [Discuss in forum] current through supply line flows at
slower speed supply wiring is covered with insulation layer supply wires are made of superior material |
Q28 ⇒ Which of the following can have negative
temperature coefficient? Electrolytes [other wrong options] [Discuss in forum] Compounds of silver Liquid metals Metallic alloys |
Q29 ⇒ The draft velocity of electrons is very small as compared to speed of light [other wrong options] [Discuss in forum] equal to speed of light almost equal to speed of light greater than speed of light |
Q30 ⇒ The property of a conductor due to
which it passes current is called conductance [other wrong options] [Discuss in forum] resistance reluctance inductance |
Q31 ⇒ If a parallel circuit is opened in the
main line, the current is zero in all branches [other wrong options] [Discuss in forum] increases in the branch of the
lowest resistance increases in each branch is zero in the highest resistive branch |
Q32 ⇒ An electric fìlamentbulb can be worked
from All above [other wrong options] [Discuss in forum] D.C. supply only AC. supply only Battery supply only |
Q33 ⇒ When one leg of parallel circuit is
opened out the total current will decrease [other wrong options] [Discuss in forum] reduce increase become zero |
Q34 ⇒ Switching of a lamp in house produces
noise in the radio. This is because
switching operation produces arcs across separating contacts [other wrong options] [Discuss in forum] mechanical noise of high intensity both mechanical noise and arc between contacts none of the above |
Q35 ⇒ Three identical resistors are first connected
in parallel and then in series.
The resultant resistance of the first
combination to the second will be 1/9 times [other wrong options] [Discuss in forum] 9 times 1/3 times 3 times |
Q36 ⇒ The condition for the validity under
Ohm's law is that resistance must be uniform [other wrong options] [Discuss in forum] current should be proportional to
the size of the resistance resistance must be wire wound type temperature at positive end should be more than the temperature at negative end |
Q37 ⇒ Conductance : mho :: resistance : ohm [other wrong options] [Discuss in forum] capacitance : henry inductance : farad lumen : steradian |
Q38 ⇒ One coulomb charge equals the charge
on 6.24 x 1018 electrons [other wrong options] [Discuss in forum] 6.24 x 1012 electrons 6.24 x 104 electrons 6.24 x 1016 electrons |
Q39 ⇒ An instrument which detects electric
current is known as galvanometer [other wrong options] [Discuss in forum] voltmeter rheostat wattmeter |
Q40 ⇒ In gases the flow of current is due to electrons, positive ions and negative ions [other wrong options] [Discuss in forum] electrons only. positive and negative ions. electrons and positive ions |
Or |