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CBSE Class 7 Science Chapter 14 MCQ Questions
Class 7 Science chapter 14, Electricity and Its Effects introduces students to the basics of electric current, its various effects, and practical uses. This chapter in NCERT textbook explores crucial topics such as electric circuits, the heating effect of electric current, and the magnetic effect of electric current included in CBSE syllabus. Mastering these concepts is essential for progressing to more advanced physics and understanding the everyday applications of electricity.
Multiple Choice Questions (MCQs) are a valuable tool for reinforcing the material covered in class 7 Science chapter 14. These MCQ questions assess students’ knowledge on different aspects, from fundamental definitions to complex applications. By working through MCQs, students can pinpoint areas where they need further study, ensuring a thorough understanding of the subject.
Here are some advantages of practicing MCQs for “Electricity and Its Effects” in Class 7:
- Concept Reinforcement: MCQs reinforce the concepts taught in the chapter. Regular practice helps students recall and apply their knowledge effectively.
- Self-Assessment: MCQs enable students to evaluate their understanding and identify topics needing more focus. This self-assessment is vital for effective learning.
- Exam Preparation: Practicing MCQs prepares students for exams by familiarizing them with the question format and types of questions they might encounter.
- Quick Revision: MCQs offer a fast and efficient way to review the entire chapter. They cover a wide range of topics, ensuring a comprehensive review.
For those looking to improve their preparation, solving “electric current and its effects class 7 mcq questions with answers” can be particularly beneficial. These questions address the key topics of the chapter and provide answers for immediate feedback and learning. Utilizing resources like “Class 7 Science Chapter 14 electric current and its effects mcq” ensures students are well-prepared and confident in their understanding of electricity and its effects.
Class 7 Science Chapter 7 Electric Current and Its Effects MCQ Questions with Answers
Here are the important MCQ questions for class 7 Science chapter 14 Weather, Electric Current and Its Effects answers:
Questions: 1
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
Questions: 2
What is the combination of two or more electric cells called?
a) Circuit
b) Battery
c) Fuse
d) Electromagnet
Answer: b
Questions: 3
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
Questions: 4
Which device is used to measure electric current in a circuit?
a) Voltmeter
b) Ammeter
c) Thermometer
d) Barometer
Answer: b
Questions: 5
What happens when a large current passes through a wire?
a) The wire becomes cold
b) The wire may melt and break
c) The wire glows
d) The wire turns green
Answer: b
Questions: 6
What is the function of a fuse in an electric circuit?
a) To increase current flow
b) To decrease voltage
c) To prevent overheating and fires
d) To light up bulbs
Answer: c
Questions: 7
What does a compass needle do when placed near a current-carrying wire?
a) It points north
b) It deflects
c) It becomes hot
d) It glows
Answer: b
Questions: 8
What is a current-carrying coil of insulated wire wrapped around a piece of iron called?
a) Battery
b) Circuit
c) Electromagnet
d) Transformer
Answer: c
Questions: 9
What effect does electric current have when it flows through a wire?
a) Cooling effect
b) Heating effect
c) Magnetic effect
d) Both heating and magnetic effects
Answer: d
Questions: 10
Which device is used to separate magnetic materials from junk?
a) Battery
b) Electromagnet
c) Thermometer
d) Barometer
Answer: b
Questions: 11
What is the primary component inside an electric bell that makes it work?
a) Battery
b) Bulb
c) Electromagnet
d) Fuse
Answer: c
Questions: 12
What is the name of the wire inside a bulb that glows when current passes through it?
a) Coil
b) Filament
c) Electrode
d) Insulator
Answer: b
Questions: 13
What is used to represent various electric components in a circuit diagram?
a) Pictures
b) Symbols
c) Words
d) Numbers
Answer: b
Questions: 14
What is the role of the element in an electric heater?
a) To cool the device
b) To produce heat
c) To produce light
d) To store energy
Answer: b
Questions: 15
Which type of appliance uses an electromagnet to function?
a) Electric fan
b) Electric bell
c) Electric bulb
d) Electric stove
Answer: b
Questions: 16
Which effect of electric current is utilized in an electric room heater?
a) Cooling effect
b) Heating effect
c) Magnetic effect
d) Luminescent effect
Answer: b
Questions: 17
How is the positive terminal of an electric cell represented in a symbol?
a) Longer line
b) Shorter line
c) Circle
d) Triangle
Answer: a
Questions: 18
What does the heating effect of electric current depend on?
a) Material, length, and thickness of the wire
b) Speed of the current
c) Type of battery used
d) Temperature of the surroundings
Answer: a
Questions: 19
What device is increasingly used in place of fuses in modern electrical systems?
a) Voltmeter
b) Ammeter
c) Miniature Circuit Breakers (MCBs)
d) Thermometer
Answer: c
Questions: 20
What happens to the electromagnet when the current is switched off?
a) It becomes a permanent magnet
b) It loses its magnetism
c) It heats up
d) It produces light
Answer: b
Questions: 21
What is the purpose of using a cell holder in a circuit?
a) To increase voltage
b) To hold and connect cells properly
c) To measure current
d) To decrease current flow
Answer: b
Questions: 22
What happens if the current through a fuse exceeds a certain limit?
a) The fuse wire glows
b) The fuse wire melts and breaks
c) The fuse wire cools down
d) The fuse wire gets longer
Answer: b
Questions: 23
What is used to represent the ‘ON’ position of a switch in a circuit diagram?
a) Circle
b) Line
c) Square
d) Dot
Answer: b
Questions: 24
Which electric component is symbolized by a longer line and a shorter but thicker parallel line?
a) Battery
b) Electric bulb
c) Electric cell
d) Switch
Answer: c
Questions: 25
Why is it dangerous to touch a lighted electric bulb connected to the mains?
a) It is very cold
b) It may give an electric shock
c) It may be very hot
d) It may break easily
Answer: c
Questions: 26
What material is commonly used in the element of an electric heater?
a) Copper
b) Nichrome
c) Aluminum
d) Steel
Answer: b
Questions: 27
What does ISI mark on an electrical appliance indicate?
a) High price
b) Safe and energy-efficient
c) Imported product
d) Low quality
Answer: b
Questions: 28
What is the unit used to measure electric current?
a) Volt
b) Ohm
c) Ampere
d) Watt
Answer: c
Questions: 29
What happens to the compass needle when electric current flows through a nearby wire?
a) It remains stationary
b) It glows
c) It deflects
d) It breaks
Answer: c
Questions: 30
What type of current is used in household electric circuits?
a) Direct current
b) Alternating current
c) Pulsating current
d) Static current
Answer: b
Class 7 Science Chapter 14 Summary – Electric Current and Its Effects
Electric Current and Electric Circuits
- Electric current is the flow of electrons through a conductor like a wire
- A continuous conducting path between the terminals of a cell or battery along which current flows is called an electric circuit
- Electric circuits can be open (switch off) or closed (switch on)
- Circuit diagrams use symbols to represent components like wires, switches, bulbs, cells, batteries
Heating Effect of Electric Current
- When current flows through a wire, it gets heated up due to the heating effect of electric current
- The heat produced depends on the material, length and thickness of the wire
- Many appliances like electric iron, heater, stove, geyser work on this heating effect
- Electric fuses prevent damage to circuits by melting and breaking when excess current flows
Magnetic Effect of Electric Current
- When current flows through a wire, it creates a magnetic field around the wire
- This magnetic effect was discovered by Hans Christian Oersted
- An electromagnet is a coil of wire wound around a soft iron core that behaves like a magnet when current flows
- Electromagnets are used in electric bells, toys, junk separators and telecommunication equipment
Electric Bell
- An electric bell contains an electromagnet that attracts an iron strip with a hammer when current flows
- The hammer hits a gong to produce sound
- As the strip moves away, the circuit breaks and the electromagnet loses its magnetism
- The strip falls back, completing the circuit again, and the cycle repeats to produce a continuous ringing
