Question 1 :
Filament is an important part of a bulb. Yes or No ?

Question 3 :
What makes it possible to light our homes, roads, offices, markets and factories even after sunset ?

Question 4 :
Fill in the blank: Outer covering of electrical wires, plug tops, switches are made of ______.

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1a9878c526e972caefc7.PNG' /> Would the bulb glow after completing the circuit shown in above figure, if instead of safety pin we use an eraser?

Question 6 :
State true or false : Electric current can pass through a sheet of thermocol.

Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c6fef59b460d7261e66e.PNG' /> Why won't the bulb glow in the circuit shown above, if instead of safety pin we use an eraser?

Question 11 :
Which of the following device is used to perform the activity to listen to music?

Question 12 :
Which of the following device is used to perform the activity to watch movies?

Question 13 :
Why should an electrician use rubber gloves while repairing an electric switch at your home?

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c701f59b460d7261e671.PNG' /> Why won't the bulb glow in the circuit shown above?

Question 15 :
State true or false : Instead of metal wires, a jute string can be used to make a circuit.

Question 16 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c660f59b460d7261e5e8.PNG' /> In the above figure, state whether the direction of current is correct or not.

Question 17 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65cf59b460d7261e5e4.PNG' /> The above figure shows a bulb connected to a cell in two different ways. Will the bulb glow in both the cases?

Question 18 :
Fill in the blank: Metal disc is the ________ terminal of the electric cell.

Question 19 :
A switch is the source of electric current in a circuit. State TRUE or FALSE?

Question 20 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c665f59b460d7261e5ee.PNG' /> In the above figure, why will the bulb not glow in the circuit?

Question 21 :
A switch helps us to use electricity as per our requirement. State TRUE or FALSE?

Question 22 :
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ____ .

Question 23 :
A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reason for this?

Question 24 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c666f59b460d7261e5ef.PNG' /> An electric bulb is connected to a cell through a switch as shown in the above figure. When the switch is brought in ‘ON’ position, the bulb does not glow. What could be the possible reason for it?

Question 25 :
What is a simple device that either breaks the circuit or completes it ?