Electric Current and its Effects MCQs with Answers

Question-1. A coil of insulated currrent- carrying wire wound around a piece of a magnetic substance is:

1. voltmeter
2. magnetic coil
3. electromagnet
4. none of these

Question-2. A combination of two or more cells is called

1. A Battery
2. A Button cell
3. An Electric cell
4. Truck Battery

Question-3. A glowing filament will be

1. At a low temperature
2. At a high temperature
3. At atmospheric temperature
4. At the temperature of ice

Question-4. An electric iron is an example of

1. heating effect of current
2. magnetic effect of current
3. chemical effect of current
4. physical effect of current

Question-5. An electromagnet is one which behaves as a magnet when current is

1. Allowed to flow through
2. Not allowed to flowthrough
3. Stopped from flowing through it

Question-6. Arrangement of cells in a device is

1. side by side
2. one after the other
3. (a) or (b)
4. none of these

Question-7. At The Time Of Short Circuit, The Current In The Circuit:

1. Reduce substantially
2. Does not change
3. Increase heavily
4. Varies continuously

Question-8. Bulbs, wires, cells and switches are known as the of a circuit.

1. element
2. switch
3. filament
4. none of these

Question-9. Current flows through the circuit when the circuit is in the…...............condition.

1. Closed
2. Open
3. Broken
4. Incomplete

Question-10. Electric Bell works on the principle

1. Electrical energy is converted into mechanical energy
2. Electrical energy is converted into sound energy
3. Mechanical energy is converted into sound energy
4. Sound energy is converted into electrical energy.

Question-11. Electromagnet is based on

1. Chemical effect of electric current
2. Heating effect of electric current
3. Magnetic effect of electric current
4. Electro-chemical effect of electric current

Question-12. Electromagnet loses its magnetic property when

1. Current is very high
2. Current is switched OFF
3. Heat is increased
4. Current is switched ON

Question-13. Fuse wire is generally made of

1. tin and lead
2. nickel and chromium
3. nickel and copper
4. chromium and silver

Question-14. In A Filament Type Bulb, A Lot Of Electric Energy Is Wasted In The Form Of:

1. Magnetism
2. Sound
3. Light
4. Heat

Question-15. Nichrome is used a coil of heater because

1. It has high resistance and high melting point
2. Low resistance and high melting point
3. High resistance and low melting point
4. None of the above

Question-16. Start To Your Left Side, Three Bulbs A, B, C Are Connected In A Circuit With The Help Of Wire, Switch And Three Cells. There Are No Defected Pieces Of Anything. If Switch Is ON Position:

1. Bulb C will glow first.
2. Bulb B and C will glow simultaneously and bulb A will glow after sometime.
3. All the bulbs A, B and C will glow at the same time.
4. The bulbs will glow in order A, B and C.

Question-17. The Compact Fluorescent Electric Lamp Has:

1. Nichrome filament
2. Chromium filament
3. Tungsten filament
4. No filament

Question-18. The heat energy produced by a glowing bulb can be minimised by using….............bulbs in place of ordinary electric bulbs

1. A candle
2. CFL bulbs
3. Torch
4. Kerosene lamp

Question-19. The magnetic material around the coil is wound is called:

1. magnetic substance
2. core
3. soft iron
4. none

Question-20. The metal which is poor conductor of electricity is

1. Gold
2. Iron
3. Aluminium
4. Mercury

Question-21. The wire which melts and breaks the circuit when large current is allowed to flow through it is called

1. A fuse wire
2. Electric wire
3. Connecting wire
4. Filament

Question-22. When an electric circuit from the positive terminal of the battery to the negative terminal of the battery is complete, then the circuit is said to be

1. Closed
2. OPen
3. No change
4. Disconnected

Question-23. When electric current flows through a conductor, the conductor becomes

1. liquid
2. vapor
3. hot
4. cold

Question-24. When Electric Current Is Passed Through The Filament Of A Bulb, It Gives Off:

1. Sound and heat
2. Heat and magnetism
3. Heat and light
4. Light

Question-25. When electric current passes through a wire , it behaves like a magnet. This is the

1. Magnetic effect of current
2. Electrical effect of current
3. Heating effect of current
4. Optical effect of current

Question-26. When the current flowing through the fuse wire exceeds the safety limit, then it will be…..............breaking the circuit.

1. Melted away
2. Remains the same
3. Damages the circuit
4. Makes the circuit remain connecte

Question-27. Which of the following is being used in place of fuses?

1. MCB
2. Nichrome
3. Filament
4. Switch

Question-28. Which of the following materials is a conductor?

1. Silver
2. Rubber
3. Cloth
4. Plastic

Question-29. Which of the following precaution need not be taken while using electric appliances?

1. Never touch lighted electric bulb connected to mains.
2. Never experiment with the electric supply from mains.
3. Never use any wire to replace fuse wire.
4. Never turn switch in ?ON? position.

Question-30. Which of the following substance is conductor of electricity:

1. rubber
2. paper
3. nails
4. plastic

Question-31. Who discovered that when a compass needle is kept nearer to an electric circuit in which current is flowing ,it deflects.

1. Hans Christian Oersted
2. Michael Faraday
3. Galileo
4. Newton

Question-32. Why are symbols used for electronic components?

1. It makes it easier to draw the circuit diagrams
2. It is essential to draw the circuit diagrams
3. It helps to show the direction of flow of current in a circuit
4. All of the above

Question-33. Choose the statement which is not correct in the case of an electric fuse.

1. Fuses are inserted in electric circuits of all buildings.
2. There is a maximum limit on the current which can safely flow through the electric circuits.
3. There is a minimum limit on the current which can safely flow in the electric circuits.
4. If a proper fuse is inserted in a circuit it will blow off if current exceeds the safe limit.

Question-34. In making a battery

1. positive terminal of one cell is connected to the negative terminal of the next cell
2. positive terminal of one cell is connected to the positive terminal of the next cell
3. negative terminal of one cell is connected to the negative terminal of the next cell
4. none of the above

Question-35. The amount of heat produced in a wire depends on

1. material
2. length
3. thickness
4. all of these

Question-36. The coil of wire contained in an electric heater is known as

1. component
2. element
3. circuit
4. spring

Question-37. Where can the key or switch be placed in the circuit?

1. Left side of the battery
2. Right side of the battery
3. Can be placed anywhere in the circuit
4. Near the positive terminal of the bulb

Question-38. Which mark is necessary on electric appliances?

1. AGMARK
2. ISI
3. FICCI
4. KSK

Question-39. Which of the following precautions need not be taken while using electric gadgets / appliances/circuit?

1. We should never touch a lighted electric bulb connected to the mains.
2. We should never experiment with the electric supply from the mains or a generator or an inverter.
3. We should never use just any wire or strip of metal in place of a fuse.
4. We should never turn the switch in ON position.

Question-40. Which one of the following is based on the heating effect of current?

1. Geyser
2. Hair dryer
3. Immersion rod
4. All of these

Question-41. Which piece is attracted by an electromagnet

1. Wood
2. Iron
3. Plastic
4. Rubber