Free PDF Download of CBSE Class 10 Science Chapter 12 Electricity Assertion Reason Questions for Class 10 Science. Assertion and Reason Question for Class 10 Science with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 10 Science Electricity to know their preparation level.
Electricity Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Q.1. Assertion (A) : Good conductors of heat are also good conductors of electricity and vice versa.
Reason (R) : Mainly electrons are responsible for conduction.
(a) Both A and R are true and R is the correct explanation of A.
Q.2. Assertion (A) : When a wire is stretched to three times of its length, its resistance becomes 9 times.
Reason (R) : Resistance is directly proportional to length of wire.
(b) Both A and R are true but R is not the correct explanation of A.
Q.3. Assertion (A) : A bird perches on a high power line and nothing happens to the bird.
Reason (R) : The circuit is incomplete for the bird sitting on high power line.
(a) Both A and R are true and R is the correct explanation of A.
Q.4. Assertion (A) : The connecting wires are made of copper.
Reason (R) : The electrical conductivity of copper is high.
(a) Both A and R are true and R is the correct explanation of A.
Q.5. Assertion (A) : Heater wire must have high resistance and high melting point.
Reason (R) : If resistance is high, the electric conductivity will be less.
(b) Both A and R are true but R is not the correct explanation of A.
Q.6. Assertion (A) : Electron has a negative charge.
Reason (R) : Electrons move always from a region of higher potential to a region of lower potential.
(c) A is true but R is false.
Q.7. Assertion (A) : A current carrying wire should be charged.
Reason (R) : The current in a wire is due to flow of free electrons in a definite direction.
(d) Assertion is false but reason is true
Q.8. Assertion (A) : The wires supplying current to an electric heater are not heated appreciably.
Reason (R) : Resistance of connecting wires is very small and H<< R.
(a) Both A and R are true and R is the correct explanation of A.
Q.9. Assertion (A) : The coil of a heater is cut into two equal halves and only one of them is used into heater. The heater will now require half the time to produce the same amount of heat.
Reason (R) : The heat produced is directly proportional to square of current.
(b) Both A and R are true but R is not the correct explanation of A.
Q.10. Assertion (A) : The fuse is placed in series with the device.
Reason (R) : Fuse consists of a piece of wire made of a metal or an alloy of appropriate melting point.
(b) Both A and R are true but R is not the correct explanation of A.
Q.11. Assertion(A) : Tungsten metal is used for making filaments of incandescent lamps.
Reason (R): The melting point of tungsten is very low.
(c) A is true but R is false.
Q.12. Assertion (A) : The resistivity of a substance does not depend on the nature of the substance and temperature.
Reason (R) : The resistivity of a substance is a characteristic property of the material.
(d) Assertion is false but reason is true
Q.13. Assertion (A) : Tungsten metal is used for making filaments of incandescent lamps.
Reason (R) : The melting point of tungsten is very low.
(c) A is true but R is false.
Q.14. Assertion (A) : If a graph is plotted between the potential difference and the current flowing, the graph is a straight line passing through the origin.
Reason (R) : The current is directly proportional to the potential difference.
(a) Both A and R are true and R is the correct explanation of A.
Q.15. Assertion (A) : When the resistances are connected end-to-end consecutively, they are said to be in series.
Reason (R) : In case the total resistance is to be increased, then the individual resistances are connected in series.
(b) Both A and R are true but R is not the correct explanation of A.
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