Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c7.PNG' /> Current does not flow in the circuit if there is a gap between the two wires. Does air never conduct electricity?

Question 2 :
Which of the following metals is used in electroplating to make objects appear shining?

Question 3 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d059f59b460d7261f2d3.PNG' /> From the above image, we can see that Boojho and Paheli performed experiments taking similar bulbs and cells but two different solutions A and B. They found that the bulb in the setup A glows more brightly as compared to that of the setup B. You would conclude that

Question 4 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d053f59b460d7261f2cb.PNG' /> In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?

Question 5 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.

Question 6 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ef59b460d7261f2d9.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 8 :
Boojho’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory

Question 10 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d051f59b460d7261f2c9.PNG' /> In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What will be observed if the number of cells are increased in the circuit shown in B?

Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' /> In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?

Question 12 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d6.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d053f59b460d7261f2cb.PNG' /> In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?

Question 15 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 16 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 17 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d2.PNG' /> In the above image, which of the following solutions will not make the bulb glow?

Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05ff59b460d7261f2da.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 20 :
Electroplating of ______________ is done on objects like water taps and cycle bell to give them a shiny appearance.

Question 21 :
Which of the following metals is used in electroplating to make objects appear shining?

Question 23 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d050f59b460d7261f2c8.PNG' /> In the above image, observing that the bulb does not glow in the circuit shown in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. Why did the bulb not glow in A?

Question 24 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d05cf59b460d7261f2d7.PNG' /> In the image above, will the bulb glow. Write ‘Yes’ or ‘No’

Question 25 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d056f59b460d7261f2cf.PNG' /> In the image above, Boojho set up this circuit for purification of copper. What will be the nature of plate A?

Question 26 :
A coating of zinc is provided to protect iron from corrosion and rust.

Question 27 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d058f59b460d7261f2d1.PNG' /> Current does not flow in the circuit if there is a gap between the two wires. Does it indicate that air is a poor conductor of electricity?

Question 28 :
Heating effect of electric current is the effect of current responsible for the glow of the bulb in an electric circuit.

Question 29 :
Small amount of a mineral salt present naturally in water makes it a ____________ of electricity.

Question 30 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d057f59b460d7261f2d0.PNG' /> In the image above, Boojho set up this circuit for purification of copper. What will be the nature of the solution?