Assertion and Reason: Electricity and Circuits | Class 6: Additional Practice PDF Download

The questions below consists of an assertion and a Reason. Use the key to choose the appropriate answer.
Q1: Assertion: The assertion states, "The electric circuit provides a complete path for electricity to pass (current to flow) between the two terminals of the electric cell."
Reason: The reason provided is, "The bulb glows only when current flows through the circuit."
(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.
Ans: (a) 
In this question, both the assertion and the reason are correct statements. An electric circuit indeed provides a complete path for electric current to flow from one terminal of the electric cell to the other terminal. Furthermore, the reason provided is a correct explanation for the assertion. When a circuit is complete and electric current flows through it, devices such as bulbs can light up due to the energy provided by the flowing current. Therefore, both the assertion and the reason are correct, and the reason explains the assertion accurately. The correct answer is option A.

Q2: Assertion: The assertion states, "Human body is a bad conductor of electricity."
Reason: The reason provided is, "The materials which allow electric current to pass through them are conductors of electricity."
(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.
Ans: (d) 
In this question, the assertion is a correct statement. Human bodies are relatively poor conductors of electricity compared to materials like metals. The reason provided is also a correct statement. Materials that allow electric current to flow through them are called conductors, and those that do not allow current to flow through them are called insulators. Therefore, both the assertion and the reason are correct. However, the reason does not accurately explain why the human body is a bad conductor; the human body is not a good conductor due to its high resistance and limited pathways for current flow. So, while both statements are correct, the reason is not a strong explanation for the assertion. The correct answer is option D.

Q3: Assertion: The assertion states, "In a closed electric circuit, the electric current pauses for one terminal of the electric cell to the other terminal."
Reason: The reason provided is, "Switch is a simple device that is used to either break the electric circuit or to complete it."
(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.
Ans: (a) 
In this question, both the assertion and the reason are correct statements. In a closed electric circuit, the electric current flows continuously from one terminal of the electric cell to the other terminal, and it does not pause. The reason provided is also correct. A switch is a device that can interrupt or complete an electric circuit. When the switch is closed, it completes the circuit, allowing current to flow. When the switch is open, it interrupts the circuit, breaking the flow of current. Therefore, both the assertion and the reason are correct, and the reason explains the assertion accurately. The correct answer is option A.

Q4: Assertion: The assertion states, "Rubber and plastics are used for covering electrical wires, plugs, switches, and other parts of electrical appliances."
Reason: The reason provided is, "The substance which does not allow electric current to pass through them are called insulator."
(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.
Ans: (a)
In this question, both the assertion and the reason are correct statements. Rubber and plastics are indeed used as insulating materials to cover electrical components to prevent the flow of electric current. The reason provided is also correct. Insulators are materials that do not allow electric current to pass through them easily. In electrical systems, insulators are used to prevent accidental contact and short circuits. Therefore, both the assertion and the reason are correct, and the reason explains the assertion accurately. The correct answer is option A.

Q5: Assertion: Electricity cannot be seen.
Reason: Electricity is a form of energy and not a matter.
(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.
Ans: (a)
Electricity is a form of energy and not matter, hence it cannot be seen.

Q6: Assertion: The filament of a bulb gets heated when the bulb is switched on.
Reason: The filament of the bulb is made of a metal which has high resistance.
(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.
Ans: (a)
The filament of a bulb is made of tungsten metal which has high resistance and it gets heated when the current passes through it.

Q7: Assertion: A switch is used to break an electric circuit.
Reason: When the switch is off, the circuit is open and no current flows through it.
(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.
Ans: (a)
A switch is used to break or complete an electric circuit. When the switch is off, the circuit is broken and no current flows through it. 

Q8: Assertion: Conductors allow electricity to pass through them.
Reason: Conductors have free electrons that can move easily, allowing the flow of electricity.
(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.
Ans: (a)
Conductors have free electrons that can move easily, which allows the flow of electricity. 

Q9: Assertion: Rubber is an insulator.
Reason: Rubber does not have free electrons to allow the flow of electricity.
(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.
Ans: (a)
Rubber is an insulator because it does not have free electrons to allow the flow of electricity.