Skip to content
Share
Explore
Question Paper
Prepared by: learnloophq@gmail.com
Chapter: 04. Light
SECTION A: MULTIPLE CHOICE QUESTIONS
Q1. What is the speed of light in water?
a. 3 × 10⁸ m/s
b. 2 × 10⁸ m/s
c. 2.25 × 10⁸ m/s
d. 1.25 × 10⁸ m/s
Q2. Which secondary colour of light is formed when red light and green light are mixed together?
a. Magenta
b. Cyan
c. Yellow
d. White
Q3. If an object is placed at a distance of 3 m in front of a plane mirror, what is the distance between the object and its image?
a. 3 m
b. 6 m
c. 1.5 m
d. 9 m
Q4. Which of the following objects will produce diffused reflection when light falls on it?
a. A plane mirror
b. A sheet of cardboard
c. A smooth wet road
d. A highly polished metal sheet
SECTION B: FILL IN THE BLANKS
Q5. The phenomenon in which the right side of an object appears to be on the left in its image, after reflection, is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Q6. The ratio by which the speed of light is slowed down when it travels through a transparent material is called the _ _ _ _ _ _ _ _ _ _ _ _ _ _ of the medium.
Q7. A _ _ _ _ _ _ _ _ _ _ _ _ _ _ is a long, vertical tube containing a set of mirrors that allows a person in a submarine to view objects above the surface of the water.
Q8. Red, green, and _ _ _ _ _ _ _ _ _ _ _ _ _ _ are the three primary colours of light.
SECTION C: TRUE OR FALSE
Q9. Diffused reflection is a failure of the laws of reflection. (True / False)
Q10. When all three primary colours of light are mixed together, they produce white light. (True / False)
Q11. The angle of incidence is the angle formed between the incident ray and the reflecting surface. (True / False)
Q12. Sunlight takes about eight minutes to reach the Earth after it is emitted from the sun. (True / False)
SECTION D: EXPLAIN AND DIFFERENTIATE TERMS
Q13. Explain the following terms:
a. Incident ray
b. Normal
c. Colour subtraction
Q14. Differentiate between the following pairs:
a. Specular reflection and Diffused reflection
b. Primary colours of light and Secondary colours of light
SECTION E: SHORT ANSWER & DIAGRAM-BASED QUESTIONS
Q15. State three characteristics of the image formed by a plane mirror.
Q16. Why is" the word AMBULANCE written as “3DHAJU8MA” (laterally inverted) on the front of ambulance vans?
"Q17. A ray of light strikes a reflective plane mirror such that the angle between the incident ray and the mirror surface is 48°. Calculate:
a. The angle of incidence (∠i)
b. The angle of reflection (∠r)
Q18. Explain why a blue object appears blue when white light is thrown on it. What colour will it appear if only red light is thrown on it?
Q19. Diagram-Based Question:
The diagram shows a flat reflecting surface with an incident ray, a reflected ray, and a perpendicular line representing the normal.
Based on the diagram description above, draw the ray diagram of reflection of light and clearly label the following:
a. Incident ray
b. Reflected ray
c. Normal
d. Angle of incidence (∠i)
e. Angle of reflection (∠r)
f. Point of incidence
SECTION F: LONG ANSWER QUESTIONS
Q20. State the two laws of reflection. Describe a step-by-step activity to verify these laws of reflection using a drawing board, pins, and a plane mirror.
Q21. A shirt is made of a material that absorbs red light. Using the process of colour subtraction, determine and explain the colour this shirt will appear under:
a. White light
b. Yellow light
(Show the step-by-step working for both cases.)
Want to print your doc?
This is not the way.
This is not the way.
Try clicking the ··· in the right corner or using a keyboard shortcut (
CtrlP
) instead.