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Answer key

Chapter: 07. Electricity

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PRACTICE EXAM: ELECTRICITY

Grade Level: Middle School (General Science) ​Time Allowed: 45 Minutes ​Total Marks: 50
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SECTION A: MULTIPLE CHOICE QUESTIONS (MCQs)

Choose the correct option for each of the following questions. (5 x 1 = 5 Marks)
Who developed the portable and compact dry cell in 1887? a. Alessandro Volta b. Georges Leclanche c. Yai Sakizo d. None of the above
What is the SI unit of electric charge (
math
⁠
)? a. Ampere b. Coulomb c. Volt d. Joule
Which component serves as the negative electrode (cathode) in a simple dry cell? a. Carbon rod b. Brass cap c. Zinc container d. Muslin bag
If three bulbs are connected in a parallel circuit and one of them gets damaged, what happens to the remaining two bulbs? a. They will stop glowing because the circuit is broken. b. They will continue to work independently. c. They will glow with twice the brightness. d. They will immediately burn out.
Which device is an automatically operated safety device that detects even a slight fluctuation in voltage and can be reset without needing replacement? a. Electric fuse b. Miniature Circuit Breaker (MCB) c. Resistor d. Dynamo
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SECTION B: FILL IN THE BLANKS

Fill in the blanks with the most appropriate word(s). (5 x 1 = 5 Marks)
The direction of conventional current is taken to flow from the _ _ _ _ _ _ _ _ _ _ _ _ _ _ terminal to the negative terminal of a battery.
A _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a device or electrical component that opposes or limits the flow of current in a circuit.
The center of an atom is called the nucleus, which consists of protons and _ _ _ _ _ _ _ _ _ _ _ _ _ _ .
An electric generator or dynamo is a device that converts mechanical energy into _ _ _ _ _ _ _ _ _ _ _ _ _ _ energy.
The chemical reactions inside secondary cells are _ _ _ _ _ _ _ _ _ _ _ _ _ _ , which allows them to be recharged and reused.
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SECTION C: TRUE OR FALSE

State whether the following statements are True (T) or False (F). (5 x 1 = 5 Marks)
Pure water is a good conductor of electricity.
In a series circuit, all connected appliances depend upon each other to complete the circuit.
Approximately 90% of outside power lines are bare, uninsulated wires, and their weather coating does not protect against electric shocks.
Georges Leclanche invented a cell in 1866 that used a dry paste of ammonium chloride.
Potential difference is defined as the amount of work done in moving a unit charge from one point to another.
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SECTION D: EXPLANATION OF TERMS

Define or explain the following terms in one or two sentences. (4 x 2 = 8 Marks)
Electric Current
Conventional Current
Battery
Insulators
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SECTION E: IDENTIFYING AND DIFFERENTIATING CONCEPTS

Differentiate between the following pairs of concepts based on the provided text. (2 x 3 = 6 Marks)
Primary Cell vs. Secondary Cell (Provide at least two differences)
Series Circuit vs. Parallel Circuit (Provide at least two differences)
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SECTION F: SHORT ANSWER QUESTIONS

Answer the following questions briefly based on the chapter details. (4 x 3 = 12 Marks)
State the mathematical relationship between electric current (
math
⁠
), charge (
math
⁠
), and time (
math
⁠
). Define the unit of current using this relation.
Why are outside power lines highly dangerous even if they appear" to have a dark weather coating?
Why is the dry cell not actually completely “dry” in its physical nature"?
What is the role of a turbine in power generation plants, such as hydroelectric or thermal power plants?
⁠

SECTION G: DIAGRAM-BASED QUESTIONS

(1 x 4 = 4 Marks)
Below is a schematic diagram of a basic electrical circuit setup.
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⁠
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Identify whether the circuit shown in the diagram is an open circuit or a closed circuit. Will the bulb glow? Give a reason for your answer. (2 Marks)
Redraw this circuit on your answer sheet using standard circuit symbols to represent a closed circuit where the bulb glows. Indicate the direction of conventional current using arrows. (2 Marks)
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SECTION H: LONG ANSWER QUESTIONS

Answer the following question in detail. (1 x 5 = 5 Marks)
Describe the internal construction of a simple dry cell. In your description, clearly specify:
The material and role of the container.
The central electrode and its cap.
The chemical composition of the electrolyte and the surrounding mixture.
⁠

SECTION I: ENVIRONMENTAL AWARENESS & EVERYDAY USE

(2 x 2 = 4 Marks)
What is the environmental significance of United Nations’ Sustainable Development Goal 12 (Responsible Consumption and Production) when it comes to old, discarded dry cells and other electrical appliances?
What safety mark should you always look for before purchasing electrical appliances for your home, and what does it indicate?
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