Question 1 :
Choose the statement which is correct in the case of an electric fuse.

Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcef59b460d7261eca6.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. Does the compass needle deflect?

Question 3 :
The combination of two or more cells is called a ____________.

Question 4 :
Which of the following is the correct symbol of an electric bulb?

Question 5 :
<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 6 :
When the current flows through a wire, does the wire behave like a magnet?

Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcef59b460d7261eca6.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. Does the compass needle deflect?

Question 8 :
If the filament of the bulb is broken, would the bulb still glow?

Question 9 :
Which of the following is the correct symbol of a switch in OFF position?

Question 10 :
<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 12 :
Longer line in the symbol for a cell represents its ___________terminal.

Question 13 :
On what factors the amount of heat produced in a wire depends on?

Question 14 :
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 15 :
<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 16 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbcaf59b460d7261eca0.jpg' /> <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61cc1abd78c526e972caf042.jpg' /> The image above shows two circuit diagrams. Are the images identical to each other ?

Question 17 :
Choose the statement which is correct in the case of an electric fuse.

Question 18 :
<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 19 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 20 :
On what factors the amount of heat produced in a wire depends on?

Question 21 :
<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 23 :
When current is switched ‘on’ in a room heater, it ___________.

Question 24 :
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 25 :
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 27 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 28 :
When the current flows through a wire, does the wire behave like a magnet?

Question 29 :
Choose the statement which is correct in the case of an electric fuse.

Question 30 :
A current carrying wire acts as a _______ with a magnetic field around it.

Question 31 :
Which of the following is the correct symbol of a switch in OFF position?

Question 32 :
Which of the following is the correct symbol of a battery?

Question 34 :
<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 36 :
Which device is used as a safety device which prevents damages to electrical circuits and possible fires?

Question 37 :
<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 40 :
Longer line in the symbol for a cell represents its ___________terminal.

Question 41 :
<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 42 :
Which of the following precautions need not to be taken while using electric gadgets/appliances/ circuit?

Question 47 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd4f59b460d7261ecae.jpg' /> In the circuit shown in the above figure, would any of the bulb glow when the switch is in the ‘OFF’ position?

Question 48 :
Name the device used these days in place of electric fuses in electrical circuits.

Question 49 :
Name any electric appliance where the heating effect of the electric current is used?

Question 50 :
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.