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Practice Class 7 Science Chapter 14 Electric Current and Its Effects MCQ Questions with Answers based on the latest NCERT syllabus. Learn about electric fuse, magnetic effect of electric current, Oersted’s discovery, nichrome wire, and batteries with detailed explanations, exam tips, and original NCERT-based solutions for CBSE and State Board students.
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Chapter Information
Subject: Science
Class: 7
Chapter: Electric Current and Its Effects
Question Type: Multiple Choice Questions (MCQs)
Difficulty Level: Easy to Moderate
Based On: Latest NCERT Syllabus
Introduction
Electricity is an important form of energy used in homes, schools, industries, and transportation. When electric current flows through a conductor, it can produce heating and magnetic effects that are useful in many electrical devices. This chapter helps students understand electric circuits, safety devices, electromagnets, and the practical applications of electric current in daily life.
What You Will Learn
✔ Electric fuse and circuit protection
✔ Magnetic effect of electric current
✔ Oersted’s discovery
✔ Heating element in electrical appliances
✔ Battery and electric cells
✔ Everyday applications of electricity
Why This Topic Is Important?
The chapter Electric Current and Its Effects introduces students to the basic principles of electrical safety and the applications of electric current. Questions from this chapter frequently appear in CBSE, State Board, Olympiad, and scholarship examinations. Understanding these concepts also promotes the safe use of electrical appliances in everyday life.
Exam Relevance
These questions are useful for:
✔ CBSE Exams
✔ State Board Exams
✔ School Tests
✔ Unit Tests
✔ Half-Yearly Exams
✔ Annual Exams
✔ Olympiad Preparation
✔ Scholarship Examinations
Q1. A combination of two or more cells is called a:
A) Switch
B) Fuse
C) Battery
D) Circuit
Answer
Battery
Concept Behind This Question
More than one electric cell can be connected together to provide greater electrical energy.
Step-by-Step Solution
A battery is formed by connecting two or more electric cells together.
Batteries are commonly used in:
- Flashlights
- Toys
- Clocks
- Remote controls
- Emergency lights
Connecting cells increases the electrical energy available for operating devices.
Therefore, the correct answer is: Battery.
Exam Tip
Remember:Two or More Cells → Battery
1. Battery (Combination of Cells)
A battery is formed when two or more cells are connected together to provide more electrical energy.
Understanding it:
A single cell gives limited power, but combining cells increases voltage and energy supply.
Where used:
- Torch (flashlight)
- Remote control
- Inverters and power systems
Example:
A TV remote usually works with two cells placed together, forming a battery.
Q2. When an electric current flows through a wire, it behaves like a:
A) Insulator
B) Switch
C) Battery
D) Magnet
Answer
Magnet
Concept Behind This Question
Electric current produces a magnetic field around a conductor.
Step-by-Step Solution
When current passes through a wire, it creates a magnetic field around it. Because of this magnetic effect, the current-carrying wire behaves like a magnet.
This principle is used in devices such as electric bells, motors, and electromagnets.
Therefore, the correct answer is: Magnet.
Exam Tip
Remember:Current-Carrying Wire → Acts Like a Magnet
2. Wire behaves like a Magnet (Magnetic Effect of Current)
When electric current flows through a wire, it produces a magnetic field around it, so the wire behaves like a magnet.
How it works:
Moving electric charges create a magnetic effect.
Result:
- The wire can attract small magnetic objects
- It can act like an electromagnet when coiled
Example:
Current-carrying wires are used in electric motors and cranes.
Q3. Which device is used to prevent damage to electrical circuits?
A) Battery
B) Electric fuse
C) Electric bell
D) Electromagnet
Answer
Electric fuse
Concept Behind This Question
Electrical circuits need protection from excessive current that may damage appliances or wiring.
Step-by-Step Solution
An electric fuse is a safety device connected in an electric circuit. If excessive current flows due to overloading or a short circuit, the fuse wire melts and breaks the circuit, preventing damage to electrical appliances.
Batteries supply electrical energy, while electric bells and electromagnets perform different functions.
Therefore, the correct answer is: Electric fuse.
Exam Tip
Remember:
Fuse → Protects electrical circuits from excessive current.
3. Electric Fuse (Safety Device)
An electric fuse is used to protect electrical circuits from damage caused by excess current.
How it works:
- It contains a thin wire that melts when current becomes too high
- This breaks the circuit and stops the flow of electricity
Why important:
Prevents short circuits, fire, and damage to appliances.
Example:
Fuses are used in household wiring and electrical devices.
Q4. The heating element of an electric iron is made of:
A) Aluminum
B) Copper
C) Nichrome
D) Iron
Answer
Nichrome
Concept Behind This Question
Heating appliances use materials that can produce heat efficiently without melting easily.
Step-by-Step Solution
Nichrome is commonly used as a heating element because it:
- Has high electrical resistance.
- Produces heat efficiently.
- Has a high melting point.
- Resists oxidation at high temperatures.
These properties make it suitable for electric irons, heaters, and toasters.
Therefore, the correct answer is: Nichrome.
Exam Tip
Remember:
Heating Element → Nichrome
4. Nichrome (Heating Element Material)
The heating element of an electric iron is made of nichrome, an alloy of nickel and chromium.
Why nichrome is used:
- High resistance (produces heat easily)
- High melting point (does not melt quickly)
- Durable and long-lasting
Example:
Used in electric iron, heater, toaster, and geyser.
Q5. Who discovered the magnetic effect of electric current?
A) Alexander Graham Bell
B) Thomas Edison
C) Newton
D) Hans Christian Oersted
Answer
Hans Christian Oersted
Concept Behind This Question
The relationship between electricity and magnetism was first observed by a scientist during an experiment.
Step-by-Step Solution
In 1820, Hans Christian Oersted observed that a compass needle moved whenever electric current passed through a nearby wire. This experiment proved that electric current produces a magnetic field.
His discovery laid the foundation for the study of electromagnetism.
Therefore, the correct answer is: Hans Christian Oersted.
Exam Tip
Remember:
Oersted → Magnetic Effect of Electric Current
5. Discovery of Magnetic Effect – Hans Christian Oersted
The magnetic effect of electric current was discovered by Hans Christian Oersted in 1820.
What he observed:
A compass needle placed near a current-carrying wire got deflected.
Conclusion:
Electric current produces a magnetic field.
Importance:
This discovery led to inventions like electromagnets, electric motors, and generators.
Important Formulas & Concepts
1. Electric Current
Electric current is the flow of electric charge through a conductor.
2. Heating Effect of Electric Current
When electric current passes through a conductor, heat is produced.
Applications:
- Electric iron
- Room heater
- Electric kettle
- Toaster
3. Magnetic Effect of Electric Current
A current-carrying conductor produces a magnetic field around it and behaves like a magnet.
Applications:
- Electric bell
- Electromagnet
- Electric motor
4. Electric Fuse
An electric fuse is a safety device that protects electrical circuits by melting when excessive current flows.
5. Heating Element
Nichrome is commonly used as the heating element because of its:
- High resistance
- High melting point
- Good durability
6. Battery
A battery is a combination of two or more electric cells connected together to supply electrical energy.
Related Practice Questions
- Why is a fuse considered an important safety device?
- Explain the magnetic effect of electric current.
- Why is nichrome preferred over copper for heating elements?
- Name two devices that use electromagnets.
- What is the difference between an electric cell and a battery?
Mini Quiz Challenge
True or False
- An electric fuse protects electrical circuits.
- A current-carrying wire behaves like a magnet.
- Hans Christian Oersted discovered the magnetic effect of electric current.
- Nichrome is commonly used in heating elements.
- A battery consists of two or more electric cells.
Exam Tips
✔ Learn the functions of fuse, switch, and battery.
✔ Remember Oersted’s contribution to electromagnetism.
✔ Revise the heating and magnetic effects of electric current.
✔ Learn why nichrome is used in heating appliances.
✔ Understand the difference between an electric cell and a battery.
Quick Revision Notes
✔ Electric fuse protects circuits from excessive current.
✔ A current-carrying wire behaves like a magnet.
✔ Hans Christian Oersted discovered the magnetic effect of electric current.
✔ Nichrome is used in heating elements.
✔ Two or more cells together form a battery.
✔ Electric current produces both heat and magnetic effects.
Common Mistakes Students Make
❌ Confusing a fuse with a switch.
❌ Thinking a battery and an electric cell are exactly the same.
❌ Assuming copper is used as the heating element in electric irons.
❌ Forgetting Oersted’s contribution to electromagnetism.
❌ Believing that only magnets produce magnetic fields.
Key Takeaways
- An electric fuse protects electrical circuits from damage caused by excessive current.
- A current-carrying wire produces a magnetic field and behaves like a magnet.
- Hans Christian Oersted discovered the magnetic effect of electric current.
- Nichrome is widely used as the heating element in electrical appliances.
- A battery is made by connecting two or more electric cells together.
FAQs
1. What is the purpose of an electric fuse?
An electric fuse protects electrical circuits by breaking the circuit when excessive current flows.
2. Why does a current-carrying wire behave like a magnet?
Because the flow of electric current produces a magnetic field around the wire.
3. Who discovered the magnetic effect of electric current?
Hans Christian Oersted discovered the magnetic effect of electric current in 1820.
4. Why is nichrome used in electric irons?
Nichrome has high electrical resistance, a high melting point, and excellent heat-producing properties, making it suitable for heating elements.
5. What is a battery?
A battery is a combination of two or more electric cells connected together to supply electrical energy.
Conclusion
This Class 7 Science MCQ Practice Set covers the important concepts of Electric Current and Its Effects, including electric fuse, magnetic effect of electric current, Oersted’s discovery, nichrome heating elements, and batteries. Regular practice of these original, NCERT-based questions helps students strengthen conceptual understanding, improve scientific reasoning, and perform confidently in school examinations and competitive tests.
NCERT Reference
Book: NCERT Science Class 7
Chapter: Chapter 14 – Electric Current and Its Effects
Based On: Latest NCERT Curriculum (CBSE)
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