Monday 1 January 2018

CBSE Class 8 - Science Chapter - Light (Unit Test) (#cbseNotes)(#eduvictors)

Light (Unit Test Paper)

CBSE Class 8 - Science Chapter - Light (Unit Test) (#cbseNotes)(#eduvictors)

Time: 1½ Hrs

Q1: If the angle between the mirror and the incident ray is 30°, what is value of the angle of reflection?

Q2(MCQ): Two plane mirrors are kept at the following angles one by one. In which case is the number of images formed the maximum?
a. 30° b. 60° c. 45° d. 90°

Note: (Q3 – Q8) Give One Word Answer

Q3: Is the reflection of light by the smooth walls of your house regular or irregular?

Q4: A plane mirror always forms the image of an object exactly on the reflecting surface. True or false?

Q5: Is the image formed by a plane mirror exactly of the same size as the object?

Q6: The image formed by a plane mirror is always erect. True or false?

Q7: If angle of incidence of a ray on a plane mirror is 60°, what is the angle of reflection?

Q8: The angle of incidence of a ray on a mirror is the angle that the ray makes with the mirror at the point of incidence.

Q9: State the two laws of reflection along with a labelled diagram.

Q10: What is lateral inversion? Draw the image of the letter 'B' as formed by a plane mirror placed on the right side of it.

Q11: The angle between two mirrors is 10°, find the number of images formed between the two.

Q12: Differentiate between regular and diffused reflection. Draw diagrams to show the two types of reflections.

Q13: At what angle the two plane mirrors be set to get three images?

Q14: List the main characteristics of the image formed by a plane mirror.

Q15: A boy is standing at a distance of 14 m in front of a mirror. He moves 2 m towards the mirror. In which direction will the image move —towards the mirror or away from it? What will the distance between the boy and his image now?

Q16: Image of an object is formed by two plane mirrors. One of the mirrors is double the size of the other. In which case will the image be bigger? Why?

Q17: Which part of the eye gets affected if someone is suffering from cataract? How is it treated?

Q18: Why we are not able to see any object in the dark?

Q19: "Reflected light can be reflected again", give an example to justify this statement.

Q20: Name the seven colours of rainbow.

Q21: Draw a diagram showing structure of human eye. Explain all the parts of human eye and its working.

Q22: What is myopia? How it can be corrected?

Q23: What is the braille system?

Q24: Why owl can see very well in the night but not during the day like other animals?

Q25: Mention whether diffused or regular reflection will take place when :
         a. A beam of light strikes a mirror
         b. A beam of light strikes a cardboard surface.
         c. A beam of light strikes a piece of paper. To the incident ray

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