Question 1 :
Are the batteries used in tractors, trucks and inverters also made from cells?

Question 2 :
If the filament of the bulb is broken, would the bulb still glow?

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd6f59b460d7261ecb1.jpg' /> As shown in the above figure , Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit .

Question 4 :
Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb60f59b460d7261ec26.PNG' /> Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the figure above. The current flowing in both the circuits is the same. Will the heat produced in both the cases be equal? Explain.

Question 6 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd6f59b460d7261ecb1.jpg' /> As shown in the above figure , Zubeda made an electric circuit using a cell holder, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit .

Question 7 :
Which of the following is the correct symbol of an electric cell?

Question 8 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb50f59b460d7261ec1a.PNG' /> When an electric current flows through a wire AB as shown in the figure, the wire?

Question 9 :
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.

Question 10 :
True or False. If a large current passes through a wire, the wire may become so hot that it may even melt and break.

Question 12 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 13 :
An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response .

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd2f59b460d7261ecab.jpg' /> A person takes around 75 cm long piece of insulated (plastic or cloth covered or enamelled) flexible wire and an iron nail, say about 6–10 cm long. He winds the wire tightly around the nail in the form of a coil. Now, he connects the free ends of the wire to the terminals of a cell through a switch as shown in above figure. Next, he places some pins on or near the end of the nail. Now, he switches on the current. Do the pins cling to the tip of the nail?

Question 16 :
If the filament of the bulb is broken, would the circuit be complete?

Question 18 :
Which device is used as a safety device which prevents damages to electrical circuits and possible fires?

Question 20 :
Name any electric appliance where the heating effect of the electric current is used?

Question 22 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb50f59b460d7261ec1a.PNG' /> When an electric current flows through a wire AB as shown in the figure, the wire?

Question 23 :
Longer line in the symbol for a cell represents its ___________terminal.

Question 25 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb53f59b460d7261ec1b.PNG' /> Three bulbs A, B, C are connected in a circuit as shown in figure. When the switch is ‘ON’

Question 26 :
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Question 27 :
What property of conducting wires is ideal for making electric fuses?

Question 29 :
Which of the following is the correct symbol of a switch in OFF position?

Question 30 :
When an electric current flows through a wire , the wire gets _____ .