CBSE Class 8 Science - Light (5)
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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?
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