CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS

CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS


CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS
Q 1 Define electric current ?
Q 2 Give mathematical formula of electric current.
Q 3 What is S I unit of electric current?
Q 4 Define one ampere of current?
Q 5 Name the device used to measure electric current in a circuit.
Q 6 How ammeter is connected in an electric circuit?
Q 7 What is the ideal value of resistance of an ammeter?
Q 8 Define electric circuit?
Q 9 Draw an electric circuit using the component's an electric bulb, battery , resistance, ammeter , voltmeter , key and connecting wires.
Q 10 What is the direction of flow of current in an electric circuit?
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS
Q 11 Define electric charge ? Give its S I units.
Q 12 Define electric field ? Give its S I unit.
Q 13 What is electric potential ? Give its S I unit.
Q 14 Define 1 Volt of electric potential?
Q 15 Define electric potential difference?
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS
Q 16 Define 1 volt of electric potential difference?
Q 17 Name the device which is used to maintain the potential difference across the circuit.
Q 18 State Ohm's Law.
Q 19 If potential difference of 12 V is applied across a conductor and a current of 20 mA following through the conductor , find the resistance of the conductor.( Hint: 1 m A = 10-3A)
Q 20 Find the value of current in circuit if 6 ohm resistor used with 12 V battery.

CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS

 Q 21 Find the resistance of a conductor in which 1 mA current passes, when potential difference across the ends of the conductor is 1 volt.
Q 22 Out of  A and B which has more resistance:

Q 23 What do you mean resistance? Give its S I units.
Q 24 Define 1 Ohm?
Q 25 Draw the graph for Ohmic and Non-Ohmic materials.
Q 26 What happens to the resistance of a circuit if the current through it is doubled?
Q 27 On what factors does the resistance of a conductor depends?
Q 28 Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source ? Why?CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS
Q 29 Why are the coils of electric toasters and electric irons made of alloy rather than pure metal?  
Q 30 The resistance of a conductor kept constant and potential difference across the conductor reduced to half of its former value. What change will occur in the current through it.
Q 31 Why is tungsten used almost exclusively for the filament of electric bulbs ? 
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS
Q 32 A wire of length 2 m , diameter 1 mm has 50 m Ω resistance. Calculate resistivity of the material of the wire.
(Ans Resistivity = 1.963 x 10-8Ω m).
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS 
Q 33 The resistivity of the material of the wire is 4 x 10-5 Ω cm. If the resistance of the wire is 14 ohm and its diameter is 1 mm, calculate the length of the wire.
( Ans Length = 27.5 m).
Q 34 How does use of fuse wire protect electric circuits/appliances?  
Q 35 n resistor each of resistance R first connected in series and then in parallel. What is the ratio of n resistors in series combination to parallel combination ?
Q 36 Ammeter burns out when connected in parallel. Give reasons.
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS 
Q 37 Two wires of equal area of cross-section , one of copper and other of manganin have same resistance. Which one will be longer?
Q 38 What happens to the resistance of a circuit if the current through it is doubled?
Q 39  Which wire should use for electric iron copper , silver or nichrome wire? Give reason.
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS 
Q 40 Two resistor of resistance R and 2 R are connected in parallel in an electric circuit. Calculate the ratio of the electric power consumed by R and 2 R ?
Q 41 A wire of resistance R is bent in form of closed circle, what is resistance across a diameter of the circle ?
Q 42 Why are copper wires used as connecting wire?
CBSE CLASS X CHAPTER 12 ELECTRICITY EXTRA QUESTIONS 

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