Here we are providing Class 7 Science Objective Chapter – 14 Electric Current and Its Effects because its very important for Class 7 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 7 Science Objective Chapter – 14 Electric Current and Its Effects is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 7 Science Objective Chapter – 14 Electric Current and Its Effects 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 7 Science Objective Chapter – 14 Electric Current and Its Effects
1.Which of the devices use a battery?
(a) Torch
(b) Transistor
(c) TV remote control
(d) All of these
Ans – ( D )
2.Bulbs, wires, cells and switches are known as the of a circuit.
(a) element
(b) switch
(c) filament
(d) none of these
Ans – ( A )
3.Arrangement of cells in a device is
(a) side by side
(b) one after the other
(c) (a) or (b)
(d) none of these
Ans – ( C )
4.An element measure the flowing an electric current is:
(a) voltmeter
(b) filament
(c) circuit
(d) ammeter
Ans – ( D )
5.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
Ans – ( A )
6.An element measure the potential difference between two points in an electric circuit is:
(a) voltmeter
(b) filament
(c) circuit
(d) ammeter
Ans – ( A )
7.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)
Ans – ( D )
8.Electric current has energy called:
(a) voltmeter
(b) filament
(c) electrical energy
(d) none of these
Ans – ( C )
9.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.
Ans – ( D )
10.The magnetic material around the coil is wound is called:
(a) magnetic substance
(b) core
(c) soft iron
(d) none
Ans – ( B )
11.In a bulb there is a thin wire called
(a) filament
(b) coil
(c) element
(d) fuse wire
Ans – ( A )
12.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
Ans – ( B )
13.Very strong electromagnets are used for lifting:
(a) fans
(b) washing machines
(c) heavy iron pieces
(d) none of these
Ans – ( C )
14.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
Ans – ( A )
15.A safety device that cuts off the current in a circuit if a sudden heavy current starts flowing in it is:
(a) fuse
(b) ammeter
(c) solenoid
(d) none of these
Ans – ( A )
16.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
Ans – ( D )
17.A cylindrical coil of current carrying wire is:
(a) voltmeter
(b) ammeter
(c) fuse
(d) solenoid
Ans – ( D )
18.The amount of heat produced in a wire depends on its
(a) material
(b) length
(c) thickness
(d) all of these
Ans – ( D )
19.A coil of insulated currrent- carrying wire wound around a piece of a magnetic substance is:
(a) voltmeter
(b) magnetic coil
(c) electromagnet
(d) none of these
Ans – ( C )
20.Which of the following is being used in place of fuses?
(a) MCB
(b) Nichrome
(c) Filament
(d) Switch
Ans – ( A )
21.The fuse wire:
(a) never breaks
(b) breaks on shorting of wire
(c) breaks on flowing of excessive current
(d) both (b) and (c)
Ans – ( B )
22.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
Ans – ( C )
23.The fuse wire:
(a) never breaks
(b) breaks on shorting of wire
(c) breaks on flowing of excessive current
(d) both (b) and (c)
Ans – ( D )
24.When electric current passes through a wire, it behave like a
(a) battery
(b) magnet
(c) fuse
(d) compass needle
Ans – ( B )
25.Which of the following liquid is bad conductor of electricity:
(a) salted water
(b) orange juice
(c) lemon juice
(d) none of these
Ans – ( D )
26.Fuse wire is generally made of
(a) tin and lead
(b) nickel and chromium
(c) nickel and copper
(d) chromium and silver
Ans – ( A )
27.Which of the following substance is conductor of electricity:
(a) rubber
(b) paper
(c) nails
(d) plastic
Ans – ( C )
28.An electric bell has a/an
(a) electromagnet
(b) hammer
(c) interrupter
(d) all of these
Ans – ( D )
29.In making a battery
(a) positive terminal of one cell is connected to the negative terminal of the next cell
(b) positive terminal of one cell is connected to the positive terminal of the next cell
(c) negative terminal of one cell is connected to the negative terminal of the next cell
(d) none of the above
Ans – ( A )
30.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
Ans – ( C )
31.Where can the key or switch be placed in the circuit?
(a) Left side of the battery
(b) Right side of the battery
(c) Can be placed anywhere in the circuit
(d) Near the positive terminal of the bulb
Ans – ( C )
32.A battery is a group of
(a) only two cells
(b) two or more cells
(c) only single cell
(d) all of the above
Ans – ( B )
33.Which one of the following is based on the heating effect of current?
(a) Geyser
(b) Hair dryer
(c) Immersion rod
(d) All of these
Ans – ( D )
34.Who discovered magnetic effect of current?
(a) H.C. Oersted
(b) Michael Faraday
(c) Ohm
(d) Flemming
Ans – ( A )
35.In making a battery
(a) positive terminal of one cell is connected to the negative terminal of the next cell
(b) positive terminal of one cell is connected to the positive terminal of the next cell
(c) negative terminal of one cell is connected to the negative terminal of the next cell
(d) none of the above
Ans – ( A )
36.Where can the key or switch be placed in the circuit?
(a) Left side of the battery
(b) Right side of the battery
(c) Can be placed anywhere in the circuit
(d) Near the positive terminal of the bulb
Ans – ( C )
37.Which one of the following is based on the heating effect of current?
(a) Geyser
(b) Hair dryer
(c) Immersion rod
(d) All of these
Ans – ( D )
38.The coil of wire contained in an electric heater is known as
(a) component
(b) element
(c) circuit
(d) spring
Ans – ( B )
39.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
Ans – ( D )
40.The amount of heat produced in a wire depends on
(a) material
(b) length
(c) thickness
(d) all of these
Ans – ( D )
41.The most suitable material for making the core of an electromagnet is
(a) iron
(b) brass
(c) aluminium
(d) steel
Ans – ( A )
42.Which mark is necessary on electric appliances?
(a) AGMARK
(b) ISI
(c) FICCI
(d) KSK
Ans – ( B )
43.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
Ans – ( C )
44.Choose the statement which is not correct in the case of an electric fuse.
(a) Fuses are inserted in electric circuits of all buildings.
(b) There is a maximum limit on the current which can safely flow through the electric circuits.
(c) There is a minimum limit on the current which can safely flow in the electric circuits.
(d) If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.
Ans – ( C )
45.The coil of wire contained in a heater is known as
(a) component
(b) circuit
(c) element
(d) spring
Ans – ( C )
46.When a switch is in OFF position.
(i) circuit starting from the positive terminal of the cell stops at the switch.
(ii) circuit is open.
(iii) no current flows through it.
(iv) current flows after some time.
Choose the combination of correct answer from the following:
(a) all are correct
(b) (ii) and (iii) are correct
(c) only (iv) is correct
(d) only (i) and (ii) are correct
Ans – ( B )
47.Which mark is necessary on electric appliances?
(a) ISI
(b) FICC
(c) AGMARK
(d) KSK
Ans – ( A )
48.Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?
(a) We should never touch a lighted electric bulb connected to the mains.
(b) We should never experiment with the electric supply from the mains or a generator or an inverter.
(c) We should never use just any wire or strip of metal in place of a fuse.
(d) We should never turn the switch in ON position.
Ans – ( D )
49.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
Ans – ( A )
50.Which of these appliances does not use on electro magnet?
(a) washing
(b) refrigerator
(c) room heater
(d) electric bell
Ans – ( C )
51.The electric current has
(a) magnetic effect
(b) heating effect
(c) chemical effect
(d) all of these
Ans – ( D )
52.Which of these is not circuit element ?
(a) potential difference
(b) voltmeter
(c) resistor
(d) battery
Ans – ( C )
53. Electric current has energy called:
( A ) voltmeter
( B ) filament
( C ) electrical energy
( D ) none of these
Ans – ( D )
