Question 2 :
When current is switched ‘on’ in a room heater, it ___________.

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd0f59b460d7261eca9.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. He switches off the current. Are the pins still clinging to the end of the nail?

Question 4 :
When the current flows through a wire, does the wire behave like a magnet?

Question 5 :
On what factors the amount of heat produced in a wire depends on?

Question 6 :
Choose the statement which is correct in the case of an electric fuse.

Question 7 :
A person takes an electric cell, a bulb, a switch and connecting wires. He makes an electric circuit. He keeps the switch in the ‘OFF’ position. Will the bulb glow?

Question 8 :
A combination of two or more cells is called a ________.

Question 10 :
Which of the following is the correct symbol of an electric cell?

Question 11 :
If the filament of the bulb is broken, would the circuit be complete?

Question 12 :
<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 13 :
<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 15 :
<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 17 :
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Question 18 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbc8f59b460d7261ec9e.jpg' /> Would the bulb glow in the above electric circuit?

Question 19 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 21 :
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.

Question 22 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 24 :
Choose the statement which is correct in the case of an electric fuse.

Question 27 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cb54f59b460d7261ec1c.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 figure. The current flowing in both the circuits is the same. Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.

Question 29 :
Longer line in the symbol for a cell represents its ___________terminal.

Question 32 :
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 33 :
A person takes an electric cell, a bulb, a switch and connecting wires. He makes an electric circuit. He keeps the switch in the ‘OFF’ position. Will the bulb glow?

Question 34 :
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 35 :
Which of the following is the correct symbol of a switch in OFF position?

Question 36 :
<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 37 :
<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 38 :
Which of the following precautions need not to be taken while using electric gadgets/appliances/ circuit?

Question 40 :
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 41 :
When current is switched ‘on’ in a room heater, it ___________.

Question 42 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcdf59b460d7261eca4.jpg' /> A person takes the cardboard tray from inside a discarded matchbox. He wraps an electric wire a few times around the cardboard tray. Then, he places a small compass needle inside it. Now, he connects the free ends of this wire to an electric cell through a switch as shown in above figure. He notes the direction in which the compass needle is pointing and brings a bar magnet near the compass needle. He moves the switch to the ‘ON’ position. Move the switch back to the ‘OFF’ position. Does the compass needle come back to its initial position?

Question 43 :
A combination of two or more cells is called a ________.

Question 46 :
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.

Question 47 :
If the filament of the bulb is broken, would the circuit be complete?

Question 48 :
The combination of two or more cells is called a ____________.

Question 50 :
A current carrying wire acts as a _______ with a magnetic field around it.