Here we are giving some important practice questions for 9th class students of ICSE Board. The practice questions are form the chapter – Light. This is for the practice only. Tests conducted in various schools have different marks scheme and weightage for various boards. The question paper carries 25 marks and in the Unit Test Pattern:
ICSE 9th Class Unit Test – Physics (Light – 25 marks)
1) Stat the laws of reflection. (2 marks)
2) What do you understand by the following terms.
a) Image b) mirror with diagram (2 x 2 = 4 marks)
3) A boy stands 4 m away from plane mirror. If the boy moves 1/2 m towards mirror, what is now the distance between the boy and his image. Give a reason for your answer. (2 marks)
4) Write any three differences between virtual image and real image. (3 marks)
5) Define Regular Reflection with a neat diagram. (3 marks)
6) An object is placed 2 cm from a plane mirror. If the object is moved by 1 cm towards the mirror, what will be the distance between the object and its new image. (1 mark)
7) In case of concave mirror, the minimum distance between an object and its real image is ………. (1 mark)
8) Which mirror is used in periscope. (1 mark)
9) Calculate the number of images formed in two plane mirrors, when they are held at the angle of
a) 72 degrees b) 36 degrees (2 marks)
10) Write any three uses of plane mirrors. (3 marks)
11) By drawing a neat diagram define the following.
a) Angle of incidence
b) Angle of reflection
c) Normal (3 marks)