Question 1 :
Reflection from a smooth surface like that of a mirror is called ______ ?

Question 3 :
If the angle of incidence ray is given $30^{\circ}$, then what is the angle of reflection?

Question 4 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d0dcf59b460d7261f379.JPG' /> From the above image, Can Boojho at C see this image?

Question 5 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07cf59b460d7261f300.jpg' /> In the above figure, two mirrors A and B are placed at right angles to each other. A ray of light incident on mirror A at an angle of $25^\circ$ falls on mirror B after reflection. The angle of reflection for the ray reflected from mirror B would be

Question 6 :
Which of the following statements is correct regarding rods and cones in the human eye?

Question 7 :
Suppose you are in a dark room. Can you see objects OUTSIDE the room?

Question 8 :
Mention whether regular or diffused reflection will take place when a beam of light strikes on a Piece of paper?

Question 10 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d07ef59b460d7261f303.jpg' /> Look at the above image. Can the image of the child in it be obtained on a screen?

Question 12 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d071f59b460d7261f2f0.PNG' /> In the above image, While playing tug of war Preeti felt that the rope was slipping through her hands. Which of the following is a way out for her to prevent this?

Question 14 :
If you place a book over 3 cylindrical pencils and push it, is it easier to move the book this way?

Question 15 :
State true or false: There is rolling friction between the wheels of a moving train and iron rails.

Question 16 :
Why the surface of mortar and pestle (silbatta) used for grinding is etched again after prolonged use?

Question 17 :
Will force of friction come into play when a rain drop rolls down a glass window pane?

Question 18 :
Friction opposes the _________________ between the surfaces in contact with each other.

Question 19 :
To reduce friction, the shape of an aeroplane is made similar to which organism?