CBSE Class 7 Science Electric Current and its Effects MCQs

Electricity is an important part of our daily lives. We use it to light our homes, run appliances, and power gadgets. But do you know how electric current works and what effects it has? In Electric Current and Its Effects Class 7 MCQ, you will find important questions to help you understand this topic better.

In this chapter, you will learn about electric circuits, heating effects of electric current, magnetic effects, and the working of electric components like bulbs, switches, and fuses. To check your knowledge, we have provided MCQ on Electric Current and Its Effects Class 7 with Answers PDF, making it easier for you to revise important concepts.

If you are preparing for exams or just want to improve your understanding, these Electric Current and Its Effects Class 7 Questions with Answers will be very useful. These MCQs Questions are based on the NCERT Solutions for Class 7 Science and follow the CBSE Class 7 Science Syllabus to ensure complete preparation.

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Class 7 Science Electric Current and Its Effects MCQ Questions with Answers

Electricity plays a vital role in our daily lives, powering everything from lights to appliances. Class 7 Science Chapter 10 Electric Current and Its Effects MCQ Questions with Answers help students understand important concepts like electric circuits, heating and magnetic effects of current, and the working of electrical components. 

Here are the important MCQ questions for class 7 Science Chapter 10 Electric Current and Its Effects answers:

Q1. Which device is used to complete or break an electric circuit?
(a) Fuse
(b) Switch
(c) Bulb
(d) Battery
Answer: (b) Switch

Q2. What happens to the bulb when the switch is in the 'ON' position in an electric circuit?

a) It remains off
b) It glows
c) It flickers
d) It heats up

Answer: b

Q3. A fuse in a circuit prevents:
(a) Current flow
(b) Overheating and damage
(c) Bulb from glowing
(d) Wire from joining
Answer: (b) Overheating and damage

Q4. Which effect of electric current is used in an electric heater?
(a) Magnetic effect
(b) Heating effect
(c) Chemical effect
(d) Sound effect
Answer: (b) Heating effect

Also Check: NCERT Solutions for Class 7 Science Chapter 10

Q5. An electric bell works mainly on the:
(a) Chemical effect of current
(b) Heating effect of current
(c) Magnetic effect of current
(d) Mechanical effect of current
Answer: (c) Magnetic effect of current

Q6. Which instrument is used to detect the presence of current in a circuit?
(a) Electrometer
(b) Galvanometer
(c) Ammeter
(d) Magnetic compass
Answer: (d) Magnetic compass

Q7. The coil of wire used in making an electromagnet is called:
(a) Filament
(b) Fuse wire
(c) Solenoid
(d) Resistor
Answer: (c) Solenoid

Q8. Which metal is commonly used in fuse wires?
(a) Aluminium
(b) Iron
(c) Copper
(d) Tin-lead alloy
Answer: (d) Tin-lead alloy

Q9. Which of the following will NOT allow current to pass through it?
(a) Copper rod
(b) Iron nail
(c) Plastic ruler
(d) Aluminium strip
Answer: (c) Plastic ruler

Q10. The chemical effect of current is used in the process of:
(a) Electroplating
(b) Filament heating
(c) Magnetic induction
(d) Making fuse
Answer: (a) Electroplating

Q11. What happens when the current in a fuse wire becomes too high?
(a) It glows brightly
(b) It melts and breaks the circuit
(c) It makes a sound
(d) It changes into an electromagnet
Answer: (b) It melts and breaks the circuit

Q12. The positive terminal of a cell is usually marked with:
(a) Minus (–) sign
(b) Plus (+) sign
(c) A dot
(d) A line
Answer: (b) Plus (+) sign

Q13. Which of these is NOT a use of an electromagnet?
(a) Electric bell
(b) Crane lifting scrap iron
(c) Loudspeaker
(d) Candle flame
Answer: (d) Candle flame

Q14. The unit of electric current is:
(a) Volt
(b) Joule
(c) Ampere
(d) Ohm
Answer: (c) Ampere

Q15. Why should fuse wires always be connected in series in a circuit?
(a) To increase brightness of bulb
(b) To measure current
(c) To stop current in the entire circuit when excess flows
(d) To store electric charge
Answer: (c) To stop current in the entire circuit when excess flows

Q16. Which symbol represents an electric cell in a circuit diagram?

a) A long line and a short thick line
b) A circle
c) A zigzag line
d) A rectangle

Answer: a

Q17. What happens to the bulb when the switch is in the 'ON' position in an electric circuit?

a) It remains off
b) It glows
c) It flickers
d) It heats up

Answer: b

Q18. What is used to represent various electric components in a circuit diagram?

a) Pictures
b) Symbols
c) Words
d) Numbers

Answer: b

Q19. What is the unit used to measure electric current?

a) Volt
b) Ohm
c) Ampere
d) Watt

Answer: c

Q20. When a wire is passing by, what happens to the needle of the compass when electric current is passed through?

a) It remains stationary
b) It glows
c) It deflects
d) It breaks

Answer: c

Q21. Which kind of current is employed in household electric circuits?

a) Direct current
b) Alternating current
c) Pulsating current
d) Static current

Answer: b

Class 7 Science Chapter 10 Summary - Electric Current and Its Effects

Electric Current and Electric Circuits

• The movement of the electrons in a conductor such as a wire is known as electric current.
• An electric circuit is a continuous conducting path between the terminals of a cell or battery on which current passes.
• Circuit Current may be open or closed.
• Circuit diagrams employ symbols to include wires, switches, bulbs, cells, batteries.

Heating Effect of Electric Current

• When electric current passes through a wire, then that wire is heated by the heating effect of electric current.
• The amount of heat generated is determined by the material, length and thickness of wire.
• This heating effect works in many appliances such as electric iron, heater, stove, and geyser.
• Electric fuses are used to avoid damage to circuit through melting and breaking when over current passes through.

Magnetic Effect of Electric Current

• A magnetic field around the wire is formed when current runs through it.
• Hans Christian Oersted discovered this magnetic effect.
• An electromagnet is a coil of wire which is wrapped around a soft iron core that acts as a magnet when current is passed through it.
• Electric bells, toys, junk separators and telecommunication equipment make use of electromagnets.

Electric Bell

• An electric bell has an electromagnet which attracts an iron strip that has a hammer on it as current passes.
• Sound is achieved by striking a gong by the hammer.
• The strip can be swept away and the circuit breaks and the magnetism is lost in the electromagnet.
• The strip returns back and the circuit is closed again and the process is repeated to create constant ringing.

Benefits of Electric Current and Its Effects Class 7 MCQ

Learning about electric current and its effects is very important for students. It helps them understand how electricity works and its uses in daily life. The Electric Current and Its Effects Class 7 MCQ is a great way to test knowledge and prepare for exams. Here are some benefits of solving MCQs on this topic:

• Quick Revision – MCQs help in revising key concepts like electric circuits, heating effects, and magnetic effects.
• Exam Preparation – Practicing MCQ on Electric Current and Its Effects Class 7 with Answers PDF helps students gain confidence before tests.
• Better Understanding – By solving Electric Current and Its Effects Class 7 Questions with Answers, students can clear their doubts and strengthen their concepts.
• Time-Saving – Multiple-choice questions allow students to quickly recall answers, improving their problem-solving speed.
• Aligned with Syllabus – These MCQs follow the NCERT Solutions for Class 7 Science and CBSE Class 7 Science Syllabus, ensuring complete learning.

Advantages of Electric Current and Its Effects Class 7 MCQ

Electric current and its impact are also beneficial in every day life. It makes students understand the principles of working of electrical devices as well as the necessity of safety. Class 7 MCQ on Solving Electric Current and Its Effects has the following benefits:

• Concept Clarity: Solving Class 7 Chapter 10 MCQs give clear understanding of the electric circuits, fuses and switches.
• Memory Boost: Solving MCQ on Electric Current and Its Effects Class 7 with Answers PDF his or her students will not have troubles remembering the key points.
• Self-Assessment: Trying Electric Current and Its Effects Class 7 Questions with Answers, the students will be able to evaluate their competence and to enhance the weak points.
• Fun Learning: MCQs allow interaction and fun learning.
• Exam Preparation: These MCQs are based on NCERT Solutions of Class 7 Science and CBSE Class 7 Science Syllabus, and are the best fit to school exams.