Free PDF Download of CBSE Class 10 Science Chapter 12 Electricity Assertion Reason Questions Class 10 Science. Assertion and Reason Questions for Class 10 Science with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 10 Science Electricity to know their preparation level.
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Electricity Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by 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.
Assertion (A): Electric current flows from a higher potential to a lower potential.
Reason (R): Electric current is the flow of electric charges in a conductor.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Resistance is a property that opposes the flow of electric current.
Reason (R): Resistance is caused by collisions between electric charges and the atoms of a conductor.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A series circuit has only one path for the flow of electric current.
Reason (R): In a series circuit, the total resistance is equal to the sum of the individual resistances.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The SI unit of electric current is the ampere (A).
Reason (R): Electric current is the rate of flow of electric charges and is measured in amperes.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Parallel connection of resistors decreases the total resistance in a circuit.
Reason (R): In a parallel circuit, the total resistance is less than the smallest individual resistance.
Answer: (b) Both A and R are true but R is not the correct explanation of A.
Assertion (A): Electric power is the rate at which work is done or energy is consumed in an electric circuit.
Reason (R): Electric power is calculated by multiplying the current flowing through a device by the voltage across it.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electric fuse is a safety device used to protect electrical appliances from damage due to excessive current.
Reason (R): The fuse wire in an electric fuse melts and breaks the circuit when the current exceeds a certain value.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): In a closed circuit, the total voltage across all the devices is equal to the sum of individual voltages.
Reason (R): In a closed circuit, the total voltage is the same at any point in the circuit due to the conservation of energy.
Answer: (b) Both A and R are true but R is not the correct explanation of A.
Assertion (A): The resistance of a wire increases with its length.
Reason (R): Resistance is directly proportional to the length of a wire.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Electric current in metal is due to the flow of electrons.
Reason (R): Electrons are negatively charged particles that can move freely within the atomic structure of a metal.
(a) Both A and R are true and R is the correct explanation of A.
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