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Class 10 Science|physics Conceptual's Questions for Electricity







Given below are the Class 10 Science Important Questions for electricity
a) Concepts questions
b) Calculation problems
c) Multiple choice questions
d) Long answer questions
e) Fill in the blank's
  1)  Give us the factors on which resistance of the conductors depends
Ans)  The resistance of a conductor depends
a) Length
b) Area of its cross-section
c) Nature of the material
2) Write down the difference between Ammeters and Voltmeters?
Ans)
S.no
Ammeters
Voltmeters
1
It measures current
It measures Potential difference
2
It is connected in Series
It is connected in Parallel
3)  Why is Tungsten used almost exclusively for filament of electric lamps?
Ans) Melting point of tungsten is very high so it is used for making filament of electric lamps
4) What happens to resistance of the conductor?
1
When Temperature is increased
2
When the length is doubled
3
When area of cross-section is increased
Ans)
1
When Temperature is increased
Increased
2
When the length is doubled
Increased
3
When area of cross-section is increased
Decreased
5)  What is the difference between Open circuits and closed circuits?
Ans)
S.no
Open Circuit
Closed circuit
1
In this plug key is open
In this plug key is closed
2
No current flows  through it
current flows  through it
6) Why does the cord of an electric heater not glow while heating element does?
Ans)  The cord of electric Heater is made of cooper which has extremely low resistance due to this negligible resistance heat is produced in it
The heating element of an electric heater is made of nichrome wire; It glows because large amount of heat is produced due to its high resistance
7) Why do we use copper wire as connecting wires in the circuit?
Ans) This is because Copper has very low resistivity
8)  True and False Statements
A) Series arrangement is used in domestic circuits
B) Resistance of the wire is directly proportional to the length of the wire
C) The graph between V and I is a straight line
D) A thick wire of length L will have less resistance than the thin wire of same length and same material
Solutions
A) False, Parallel arrangement are used in domestic circuits
B) True
C) True
D) True
9)  Gave the formula for each
1
Ohm’s Law
2
Resistance in terms of Length,Area,resistivity
3
Current in terms of Resistance and Voltage
4
Equivalent Resistance for Resistors in Series
5
Equivalent Resistance for Resistors in Parallel
6
Power produced in the resistance
Solutions
1
Ohm’s Law
V=IR
2
Resistance in terms of Length,Area,resistivity
$R=\rho \frac{L}{A}$
3
Current in terms of Resistance and Voltage
$I=\frac{V}{R}$
4
Equivalent Resistance for Resistors in Series
R=R1+R2+R3…..
5
Equivalent Resistance for Resistors in Parallel
$\frac{1}{R}=\frac{1}{R_{1}}+\frac{1}{R_{2}}$
6
Power produced in the resistance
P=I2R

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