Question 1 :
What is a simple device that either breaks the circuit or completes it ?

Question 2 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1c701f59b460d7261e671.PNG' /> Why won't the bulb glow in the circuit shown above?

Question 3 :
<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 4 :
<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 5 :
<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 6 :
State the following as correct or wrong: Balanced diet for the body should contain a variety of food items.

Question 7 :
State the following as correct or wrong: Deficiency diseases can be prevented by eating a balanced diet.

Question 8 :
Fill in the blank: Night blindness is caused due to deficiency of ____________ in our food.

Question 9 :
Name the following: The nutrients which mainly give energy to our body.

Question 11 :
<img src='61b1c6b9f59b460d7261e628' /> Three torches A, B and C shown in the above figure are switched on one by one. The light from which of the torches will not form a shadow of the ball on the screen?

Question 13 :
Which of the following is/are not always necessary to observe a shadow?

Question 14 :
<img src='61b1c697f59b460d7261e624' /> <img src='61cc1a9278c526e972caefc1' /> A torch is placed at two different positions A and B, one by one, as shown in the above figure . The shape of the shadow obtained in two positions is also shown. Match the position of the torch and shape of the shadow of the ball .

Question 15 :
Paheli observed the shadow of a tree at 8:00 a.m., 12:00 noon and 3:00 p.m. Which of the following statements is closest to her observation about the shape and size of the shadow?