Question 1 :
Which of the following device is used to perform the activity to listen to music?
Question 2 :
State whether True or False: An electric cell produces electricity from the chemicals stored inside it.
Question 3 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c66af59b460d7261e5f3.PNG' />
Which of the arrangement A, B, C and D given in the above figure should not be set up? Explain, why.
Question 5 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c669f59b460d7261e5f1.PNG' />
Paheli connected two bulbs to a cell as shown in the above figure. She found that filament of bulb B is broken. Will the bulb A glow in this circuit?
Question 6 :
The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?
Question 8 :
State whether True or False: The switches can not be used in lighting of electric bulbs and other devices in homes.
Question 9 :
When the switch is open there is an air gap between its terminals. State TRUE or FALSE?
Question 10 :
Which of the following device is used to perform the activity to watch movies?
Question 11 :
Fill in the blank: _____ is the negative terminal of electric cell.
Question 12 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c661f59b460d7261e5e9.PNG' />
In the above figure, state whether the direction of current is correct or not.
Question 13 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c662f59b460d7261e5eb.PNG' />
In the circuit shown above, when the switch is moved to ‘ON’ position _____ .
Question 14 : <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 15 : <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 18 : <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 19 :
Electric cells are used in alarm clocks, wristwatches, transistor radios, cameras and many other devices. Yes or No ?
Question 20 : <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 21 :
Fill in the blank: Metal disc is the ________ terminal of the electric cell.
Question 22 :
Fill in the blank: Electricity to the bulb in a torch is provided by the ________.
Question 23 :
State whether True or False: A fused bulb does not light up as no current passes through its filament.
Question 24 :
Fill in the blank: The thin wire that gives off light is called the _______ of the bulb.
Question 25 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65ef59b460d7261e5e6.PNG' />
The above figure shows a bulb connected to a cell in two different ways. What will be the direction of the current through the bulb in the case A ?
Question 26 :
Fill in the blank: Outer covering of electrical wires, plug tops, switches are made of ______.
Question 27 :
A torch is not functioning, though contact points in the torch are in working condition. What can be the possible reason for this?
Question 28 :
A switch helps us to use electricity as per our requirement. State TRUE or FALSE?
Question 30 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c66cf59b460d7261e5f4.PNG' />
The above figure shows a bulb with its different parts marked as 1, 2, 3, 4 and 5. Which of them label the terminals of the bulb?
