CBSE Class 8 Science Light Assignment Set E

1.Light is a form of ___________ radiation.

(A) Electromagnetic. B) Mechanical. (C) Longitudinal. (D) None of these.

2.The wavelength of visible light is in the range:

(A) 4 × 10^-7 m to 8 × 10^-7 m. (B) 4 × 10⁷ m to 8 × 10⁷ m.

(C) 4 × 10³ m to 8 × 10³ m. (D) None of these.

3.An ________ image can be obtained on a screen.

(A) Real. (B) Virtual. (C) Upright. (D) Inverted.

4.According to the laws of reflection:

(A) Angle i = Angle r (B) Sine i = sine r (C) Sine i / Sine r = constant (D) All of these.

5.The colour of an object is determined by

(A) The colour of light reflected by it: (B) The colour of light absorbed by it.

(C) The colour of light incident on it only. (D) None of the above.

6.Human eye is one of the most valuable and sensitive organ that:

(A) Enables us to see the wonderful world and colours around us.

(B) Can identify the objects.

(C) Is like a camera.

(D) All of these.

7.The ray of light strikes at the surface of mirror is called:

(A) Reflected ray.

(B) Incident ray.

(C) Normal ray.

(D) None of these.

8.Which of the following does not describe working of the human eye?

(A) Light enters the eye through a thin membrane called the cornea.

(B) Rainbow is formed due to splitting of white light.

(C) Iris is a dark muscular diaphragm that controls the size of the pupil for.

(D) Regulating the amount of light entering into the eye.

9.Electrical signals generated by light sensitive cells of retina are sent to the brain via:

(A) Motor nerves.

(B) Optic nerves.

(C) Sensory nerves.

(D) Spinal cord.

10.Least distance of vision for a normal eye is:

(A) 25 cm.

(B) 1 m.

(C) 30 cm.

(D) Infinity.

11.The eye lens forms an ___________ and _________ image of the object on the retina.

(A) Virtual and erect.

(B) Real and inverted.

(C) Real and erect.

(D) Virtual and erect.

12.Iris contracts the pupil:

(A) In bright light.

(B) To allow less light to enter.

(C) In darkness.

(D) Only (a) and (b).

13.Colour blindness is the name given to:

(A) Inability to distinguish between colours.

(B) Inability to see anything.

(C) Inability to see in dark.

(D) Inability to see in bright light.

14.The transparent front part of eye is called:

(A) Iris.

(B) Cornea.

(C) Pupil.

(D) Cone.

15.Reflection from a rough surface is called:

(A) Regular reflection.

(B) Diffused reflection.

(C) Irregular reflection.

(D) Only (b) & (c).

16.Reflection from a smooth surface is called:

(A) Regular reflection.

(B) Diffused reflection.

(C) Irregular reflection.

(D) None of these.

17.If angle of incidence is 30° than angle of reflection will be

(A) 60°

(B) 0°

(C) 30°

(D) None.

18.If the angle between incident and reflected ray is 50° than find the angle of incidence.

(A) 50°

(B) 30°

(C) 25°

(D) 100°

19.Splitting of white light on passage through a triangular prism:

(A) Takes place due to the inclined surfaces.

(B) Is known as dispersion of light.

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