Question 1 :
<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 2 :
<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 3 :
Electroplating of ______________ is done on objects like water taps and cycle bell to give them a shiny appearance.

Question 4 :
<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 5 :
One of the most common applications of chemical effect of electric current is __________.

Question 7 :
Lightning Conductor is a device used to protect buildings from the effect of lightning. Is it TRUE OR FALSE?

Question 9 :
The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella?

Question 11 :
The sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration?

Question 13 :
Which of the following statements are correct? (i) Sound is produced by vibrations. (ii) Sound requires a medium for propagation. (iii) Light and sound both require a medium for propagation. (iv) Sound travels slower than light.

Question 15 :
A list of mediums is given. (i) wood (ii) water (iii) air (iv) vacuum. In which of these mediums can sound travel?

Question 19 :
Unwanted or unpleasant sound is termed as music. True or False ?

Question 20 :
Noise pollution may cause partial hearing impairment. Is that correct ?