Lakshya Education MCQs

Question: A thin wire that emits light in a bulb is known as _____.
Options:
A.insulator
B.filament
C.reflector
D.refractor
Answer: Option B
: B

The thin wire that emitslight is known as the filament of the bulb. It is generally made up of tungsten. When current passes through it, it heats up and glows.

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More Questions on This Topic :

Question 1. Electricity is not a form of energy.
  1.    True
  2.    False
Answer: Option B
: B

Energy is the ability to do work. Electricity is one of the forms ofenergyresulting from the flow of electric charges. With the help of electricity, we can do many things like operate machines, lightbulbs, fans etc.
Question 2. A battery made up of two cells has ________ terminals.
  1.    one
  2.    two
  3.    three
  4.    four
Answer: Option B
: B

There are two terminals in a battery. Battery terminals are the electrical contacts used to connect a load (for example, a bulb) to the battery. Number of terminals in a battery is independent of the number of cells used to make the battery.
Question 3. In an electric circuit, current flows from __________ of the electric cell.
  1.    the positive terminal to the negative terminal
  2.    the negative terminal to the positive terminal
  3.    the neutral terminal to the positive terminal
  4.    the neutral terminal to the negative terminal
Answer: Option A
: A

In an electric circuit, the current flows from the positive terminal to thenegative terminal of the cell. The image below gives the direction of current, where 'I' denotes the current.The direction of flow of electrons is opposite to the direction of flow of current.
Question 4. Materials which do not allow electric current to flow through them are known as insulators.
  1.    True
  2.    False
  3.    reflector
  4.    cell
Answer: Option A
: A

Electrical insulators arematerials which donot have free electrons in them and thereby do not allowelectric current to flow through them. For example, wood, plastic, etc.
Question 5. Electricity is very essential for our day to day activities. 
  1.    True
  2.    False
Answer: Option A
: A

Electricityplays a huge part in our every day lives, whether it is at homes or our workplaces.

Our daily routines rely heavily on the use ofelectricity like using an iron, refrigerator, television, washing machine and so on.
Question 6. Which of the following appliances does not operate on an electric cell/battery?
  1.    Torch
  2.    TV remote
  3.    Walkie-talkie
  4.    Air conditioner
Answer: Option D
: D

Usually, electric cells/batteries are capable of producing very less amount of electric current. Devices like torch, TV remote, and walkie-talkie require less amount of current to function and the use of electric cell is preferred for these applications.
On the other hand, an air conditioner requires larger current. Air conditioner uses mains power supply for its working.

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