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Class 9th Science Chapter 8 mcq. We covered all the Class 9th Science Chapter 8 mcq in this post for free so that you can practice well for the exam.
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Class 9th Science Chapter 8 Objective mcq for Students
The Sun appears reddish at sunset because of
(A) Reflection of Light
(B) Scattering of Light
(C) Refraction of Light
(D) Diffraction of Light
Option b – Scattering of Light
The reddish colour of the Sun during sunrise and sunset occurs due to
(A) Scattering of Light
(B) Refraction of Light
(C) Total internal reflection of Light
(D) Dispersion of Light
Option a – Scattering of Light
To an astronaut in space, the sky appears
(A) Blue
(B) White
(C) Black
(D) Red
Option c – Black
When viewed from an aircraft flying at a very high altitude, the sky looks
(A) Blue
(B) Black
(C) White
(D) Red
Option b – Black
The blue appearance of the sea is mainly due to
(A) Its great depth
(B) Reflection of the sky along with scattering of light by water droplets
(C) The inherent blue colour of water
(D) The upper layer of seawater
Option b – Reflection of the sky along with scattering of light by water droplets
The idea of an expanding universe is based on the
(A) Doppler effect
(B) Stark effect
(C) Zeeman effect
(D) Raman effect
Option a – Doppler effect
If a spacecraft moves away from the Earth at one-fifth the speed of light and light inside it appears blue to passengers, how would the same light appear to an observer on Earth?
(A) Blue
(B) Orange
(C) Yellow
(D) Yellow-orange
Option c – Yellow
Red light is commonly used as a warning signal because
(A) It undergoes the least scattering
(B) It is soothing to human eyes
(C) It causes minimal chemical reactions
(D) It is least absorbed by air
Option a – It undergoes the least scattering
The blue colour of the sky is explained by
(A) Scattering of light
(B) Dispersion of light
(C) Interference of light
(D) Greater emission of blue light by the Sun
Option a – Scattering of light
We covered all the class 9th science chapter 8 mcq above in this post for free so that you can practice well for the exam.
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Also, check out:
- MCQ Questions for Class 10 Science Maharashtra Board
- Class 12 Political Science MCQ in Hindi
- ch 1 Science Class 10 MCQ
