Question 1 :
<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 2 :
What property of conducting wires is ideal for making electric fuses?

Question 3 :
Choose the statement which is correct in the case of an electric fuse.

Question 7 :
Name any electric appliance where the heating effect of the electric current is used?

Question 8 :
Which of the following is the correct symbol of an electric cell?

Question 9 :
<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 10 :
What is correct about a switch when it is in OFF position?

Question 11 :
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.

Question 12 :
Choose the statement which is correct in the case of an electric fuse.

Question 14 :
The combination of two or more cells is called a ____________.

Question 15 :
<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 16 :
Which of the following precautions need to be taken while using electric gadgets/appliances/ circuit?

Question 17 :
<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 20 :
Are the batteries used in tractors, trucks and inverters also made from cells?

Question 21 :
In an electric circuit a fuse is a ________ to prevent possible fire.

Question 24 :
Which of the following is the correct symbol of an electric bulb?

Question 25 :
The safety device based on the heating effect of electric current is called a _____________.

Question 26 :
Choose the statement which is correct in the case of an electric fuse.

Question 27 :
When current is switched ‘on’ in a room heater, it ___________.

Question 28 :
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.

Question 29 :
The coil behaves like a magnet when electric current flows through it. When the electric current is switched off, the coil generally loses its magnetism. Such coils are called?

Question 30 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd5f59b460d7261ecaf.jpg' /> In the circuit shown in the above figure, what will be the order in which the bulbs A, B and C will glow when the switch is moved to the ‘ON’ position?

Question 31 :
Which of the following is the correct symbol of a battery?

Question 32 :
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 33 :
<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 34 :
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 36 :
Choose the statement which is not correct in the case of an electric fuse.

Question 37 :
<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 38 :
If the filament of the bulb is broken, would the bulb still glow?

Question 40 :
<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 41 :
Which of the following is the correct symbol of a switch in OFF position?

Question 42 :
A current carrying wire acts as a _______ with a magnetic field around it.

Question 43 :
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its ______ position.

Question 46 :
<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 47 :
A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet. State true or false .

Question 50 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1cbd5f59b460d7261ecb0.jpg' /> In the above figure , will the compass needle show deflection when the switch in the circuit is closed?