We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Electric Current and Its Effects Class 7 MCQs Questions with Answers here along with a detailed explanation.
Electric Current and Its Effects Class 7 MCQs Questions with Answers
Choose the correct option.
Question 1
Which of the devices use a battery?
(a) Torch
(b) Transistor
(c) TV remote control
(d) All of these
Answer
Answer: (d) All of these
Question 2.
Arrangement of cells in a device is
(a) side by side
(b) one after the other
(c) (a) or (b)
(d) none of these
Answer
Answer: (c) (a) or (b)
Question 3.
In an electric circuit, the bulb glows only when the switch is in the
(a) ‘ON’ position
(b) ‘OFF’ position
(c) (a) or (b)
(d) none of these
Answer
Answer: (a) ‘ON’ position
Question 4.
When the switch is in the ‘ON’ position, the electric circuit is said to be
(a) closed
(b) open
(c) complete
(d) both (a) and (c)
Answer
Answer: (d) both (a) and (c)
Question 5.
Which of the following precaution need not be taken while using electric appliances?
(a) Never touch lighted electric bulb connected to mains.
(b) Never experiment with the electric supply from mains.
(c) Never use any wire to replace fuse wire.
(d) Never turn switch in ‘ON’ position.
Answer
Answer: (d) Never turn switch in ‘ON’ position.
Question 6.
In a bulb there is a thin wire called
(a) filament
(b) coil
(c) element
(d) fuse wire
Answer
Answer: (a) filament
Question 7.
When the bulb gets fused, the electric current
(a) flows in the circuit
(b) does not flow in the circuit
(c) sometimes flows and sometimes not
(d) none of these
Answer
Answer: (b) does not flow in the circuit
Question 8.
A glowing bulb becomes warm due to the
(a) heating effect of current
(b) magnetic effect of current
(c) chemical effect of current
(d) physical effect of current
Answer
Answer: (a) heating effect of current
Question 9.
An electric iron is an example of
(a) heating effect of current
(b) magnetic effect of current
(c) chemical effect of current
(d) physical effect of current
Answer
Answer: (a) heating effect of current
Question 10.
The amount of heat produced in a wire depends on its
(a) material
(b) length
(c) thickness
(d) all of these
Answer
Answer: (d) all of these
Question 11.
The electric current has
(a) magnetic effect
(b) heating effect
(c) chemical effect
(d) all of these
Answer
Answer: (d) all of these
Question 12.
Which of the following is being used in place of fuses?
(a) MCB
(b) Nichrome
(c) Filament
(d) Switch
Answer
Answer: (a) MCB
Question 13.
Which of the following is not a reason for excessive currents in electrical circuits?
(a) Direct touching of wires
(b) Short circuiting
(c) Switch in ‘off position
(d) Overloading
Answer
Answer: (c) Switch in ‘off position
Question 14.
When electric current passes through a wire, it behave like a
(a) battery
(b) magnet
(c) fuse
(d) compass needle
Answer
Answer: (b) magnet
Question 15.
Fuse wire is generally made of
(a) tin and lead
(b) nickel and chromium
(c) nickel and copper
(d) chromium and silver
Answer
Answer: (a) tin and lead
Question 16.
A current carrying wire produces
(a) an electric effect
(b) a magnetic effect
(c) both electric and magnetic effects
(d) neither electric nor magnetic effect
Answer
Answer: (c) both electric and magnetic effects
Question 17.
A battery is a group of
(a) only two cells
(b) two or more cells
(c) only single cell
(d) all of the above
Answer
Answer: (b) two or more cells
Question 18.
Who discovered magnetic effect of current?
(a) H.C. Oersted
(b) Michael Faraday
(c) Ohm
(d) Flemming
Answer
Answer: (a) H.C. Oersted
Question 19.
Circuit breaker device which can be used in place of fuse in domestic electric wiring is called
(a) CBD
(b) DCB
(c) MCD
(d) MCB
Answer
Answer: (d) MCB
Question 20.
The most suitable material for making the core of an electromagnet is
(a) iron
(b) brass
(c) aluminium
(d) steel
Answer
Answer: (a) iron
Question 21.
Key or switch in a circuit is placed
(a) left side of the battery
(b) right side of the battery
(c) anywhere in the circuit
(d) near the positive terminal of cell
Answer
Answer: (c) anywhere in the circuit
Question 22.
The coil of wire contained in a heater is known as
(a) component
(b) circuit
(c) element
(d) spring
Answer
Answer: (c) element
Question 23.
Which mark is necessary on electric appliances?
(a) ISI
(b) FICC
(c) AGMARK
(d) KSK
Answer
Answer: (a) ISI
Question 24.
An electromagnet acts like a magnet
(a) when a current is passed through the coil
(b) all the time
(c) only if a current does not pass through the coil
(d) none of these
Answer
Answer: (a) when a current is passed through the coil
Question 25.
An electric bell has a/an
(a) electromagnet
(b) hammer
(c) interrupter
(d) all of these
Answer
Answer: (d) all of these
Fill in the blanks with suitable word/s.
Question 1.
A combination of two or more cells is called a ……………..
Answer
Answer: battery
Question 2.
In a battery, the …………….. terminal of one cell is connected to the …………….. terminal of another cell.
Answer
Answer: positive; negative
Question 3.
An electric iron works on the principle of …………….. effect of electric current.
Answer
Answer: heating
Question 4.
The crane in a junkyard separate iron from the junk by using …………….. effect of electric current.
Answer
Answer: magnetic
Question 5.
The bulb glows as the switch is moved to the …………….. position.
Answer
Answer: ‘ON’
Question 6.
When the bulb gets fused, its …………….. breaks.
Answer
Answer: filament
Question 7.
When the switch is in the ‘OFF’ position, the circuit is said to be …………….. or …………….. and no current flows through it.
Answer
Answer: open, incomplete
Question 8.
The needle of a compass is a tiny which points in …………….. direction.
Answer
Answer: magnet; north-south
Question 9.
When we bring a close to the needle, it gets ……………..
Answer
Answer: magnet; deflected
Question 10.
There is a maximum limit on the …………….. which can safely flow through a ……………..
Answer
Answer: current; circuit
Question 11.
Our body is a …………….. of electricity.
Answer
Answer: conductor
Question 12.
An electric cell produces electricity due to …………….. stored in it.
Answer
Answer: chemicals
Question 13.
A group of two or more cells is called a ……………………..
Answer
Answer: battery
Question 14.
A device that breaks the circuit is called a ……………………..
Answer
Answer: switch
Question 15.
In electric circuit, the current flows from …………………….. terminal to the terminal.
Answer
Answer: positive, negative
Question 16.
Metals are …………………….. conductors.
Answer
Answer: good
Question 17.
A device which converts electric energy into light energy is ……………………..
Answer
Answer: bulb
Question 18.
H.C. oersted discovered the …………………….. effect current.
Answer
Answer: magnetic
Question 19.
…………………….. is a safety device used in electric circuits.
Answer
Answer: Fuse
True or False
Question 1.
A battery is a combination of cells in which positive terminals of both the cells are connected to one other.
Answer
Answer: False
Question 2.
The key or switch can be placed anywhere in an electrical circuit.
Answer
Answer: True
Question 3.
CFLs increase wastage of power.
Answer
Answer: False
Question 4.
The wires used for making electric circuits normally become hot.
Answer
Answer: False
Question 5.
A glowing electric bulb becomes warm.
Answer
Answer: True
Question 6.
When the circuit is closed, the electric current does not flow throughout the circuit.
Answer
Answer: False
Question 7.
In an open circuit, the electric current flows throughout the circuit.
Answer
Answer: False
Question 8.
An electromagnet is a temporary magnet.
Answer
Answer: True
Question 9.
An electric bulb gives only light.
Answer
Answer: False
Question 10.
The electromagnet weakens the cell quickly if left connected to it.
Answer
Answer: True
Question 11.
Positive terminal of cell should be connected to the positive terminal of other cell.
Answer
Answer: False
Question 12.
A bulb is an electric component.
Answer
Answer: True
Question 13.
Fuse works on magnetic effect of current.
Answer
Answer: False
Question 14.
LEDs are more efficient than incandescent bulbs.
Answer
Answer: True
Question 15.
Electric bell works on magnetic effects of current.
Answer
Answer: True
Question 16.
A electromagnet is a permanent magnet.
Answer
Answer: False
Question 17.
MCBs are preferred over electric fuse.
Answer
Answer: True
Match the Following
| Column I | Column II |
| 1. Fuse wire | (a) Irreversible |
| 2. Switch | (b) Incomplete circuit |
| 3. MCB | (c) Complete circuit |
| 4. CFL | (d) High melting point |
| 5. Open circuit | (e) Heating effect of current |
| 6. Closed circuit | (f) Turns the circuit ‘ON’ or ‘OFF’ |
| 7. Electric heater | (g) Indian Standard Institute |
| 8. Electric bell | (h) Low melting point |
| 9. Heating element | (i) Compact fluorescent lamps |
| 10. ISI | (j) Magnetic effect of current |
Answer
Answer:
| Column I | Column II |
| 1. Fuse wire | (h) Low melting point |
| 2. Switch | (f) Turns the circuit ‘ON’ or ‘OFF’ |
| 3. MCB | (a) Irreversible |
| 4. CFL | (i) Compact fluorescent lamps |
| 5. Open circuit | (b) Incomplete circuit |
| 6. Closed circuit | (c) Complete circuit |
| 7. Electric heater | (e) Heating effect of current |
| 8. Electric bell | (j) Magnetic effect of current |
| 9. Heating element | (d) High melting point |
| 10. ISI | (g) Indian Standard Institute |
| Column A | Column B |
| 1. MCB | (a) Pleating effects of current |
| 2. Fleater | (b) Turns the circuit On or OFF |
| 3. Fuse | (c) Magnetic effect of current |
| 4. Electromagnet | (d) A safety device to prevent short circuit |
| 5. Switch | (e) Circuit breaker |
Answer
Answer:
| Column A | Column B |
| 1. MCB | (d) A safety device to prevent short circuit |
| 2. Fleater | (a) Pleating effects of current |
| 3. Fuse | (e) Circuit breaker |
| 4. Electromagnet | (c) Magnetic effect of current |
| 5. Switch | (b) Turns the circuit On or OFF |
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