Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65ff59b460d7261e5e7.PNG' />
In the above figure, state whether the direction of current is correct or not .
Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c665f59b460d7261e5ee.PNG' />
In the above figure, why will the bulb not glow in the circuit?
Question 3 :
Fill in the blank: _____ is the negative terminal of electric cell.
Question 4 :
Fill in the blank : A device that is used to break an electric circuit is called _______.
Question 5 :
State whether True or False: Human body is an insulator of electricity.
Question 6 :
Why should an electrician use rubber gloves while repairing an electric switch at your home?
Question 7 :
Both the electric cell and the bulb have two terminals each. Why do they have these two terminals?
Question 8 :
Fill in the blank: Metal cap is the ________ terminal of the electric cell.
Question 9 :
State whether True or False: The switches can not be used in lighting of electric bulbs and other devices in homes.
Question 10 :
State whether True or False: An electric cell produces electricity from the chemicals stored inside it.
Question 11 :
Fill in the blank: Metal disc is the ________ terminal of the electric cell.
Question 12 :
A switch helps to complete or break the circuit. State TRUE or FALSE?
Question 13 :
A switch is the source of electric current in a circuit. State TRUE or FALSE?
Question 15 :
State true or false : Electric current can flow through metals.
Question 16 :
<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?
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 :
<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 20 :
<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 21 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65df59b460d7261e5e5.PNG' />
The above figure shows a bulb connected to a cell in two different ways. Does the brightness of the glowing bulb depend on the direction of current through it?
Question 22 :
<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 23 :
Which of the following device is used to perform the activity to listen to music?
Question 24 :
<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 25 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65cf59b460d7261e5e4.PNG' />
The above figure shows a bulb connected to a cell in two different ways. Will the bulb glow in both the cases?
Question 27 :
Fill in the blank: Switches, electrical plugs and sockets are made of _________.
Question 28 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c661f59b460d7261e5ea.PNG' />
In the above figure, state whether the direction of current is correct or not.
Question 29 :
<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 30 :
Fill in the blank: A ________ has a bulb that lights up when it is switched on.
Question 31 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c663f59b460d7261e5ec.PNG' />
In the above figure the bulb will not glow if the ends A and B are connected with
Question 32 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c65cf59b460d7261e5e3.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 B ?
Question 33 :
When the switch is open there is an air gap between its terminals. State TRUE or FALSE?
Question 34 :
What is a simple device that either breaks the circuit or completes it ?
Question 38 :
Which of the following device is used to perform the activity to heat water?
Question 39 :
State whether True or False: A fused bulb can light up when current passes through its filament.
Question 40 :
<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 41 :
Instead of metal wires, a jute string can be used to make a circuit. Yes or No ?
Question 44 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c700f59b460d7261e670.PNG' />
Would the bulb glow in the circuit shown above?
Question 45 :
State whether True or False: Air is an insulator of electricity.
Question 47 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c6fff59b460d7261e66f.PNG' />
Would the bulb glow in the circuit shown above, if instead of safety pin we use an eraser?
Question 48 :
State whether True or False: Electric current can flow through metals.
Question 49 :
State whether True or False: The bulb glows only when current flows through the circuit.
Question 50 :
Using the 'conduction tester' on an object it was found that the bulb begins to glow. Is the object a conductor or an insulator?