NCERT Class 9 Science MCQ Chapter 13 Earth as a System: Energy, Matter, and Life English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 13 Earth as a System: Energy, Matter, and Life Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 13 Earth as a System: Energy, Matter, and Life Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 13 Earth as a System: Energy, Matter, and Life
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Earth as a System: Energy, Matter, and Life
Chapter – 13
| MCQ |
Tick the Correct Options:
1. What is the main source of energy that powers life and natural processes on Earth?
(a) The Earth’s hot interior.
(b) Fossil fuels.
(c) The Sun.
(d) Chemical reactions in rocks.
Ans: (c) The Sun.
2. Which sphere of the Earth includes the solid form of water, such as Himalayan glaciers and polar ice caps?
(a) Hydrosphere.
(b) Geosphere.
(c) Biosphere.
(d) Cryosphere.
Ans: (d) Cryosphere.
3. What is the speed of light in a vacuum?
(a) 3 × 10⁵ m s⁻¹.
(b) 3 × 10⁶ m s⁻¹.
(c) 3 × 10⁸ m s⁻¹.
(d) 3 × 10¹⁰ m s⁻¹.
Ans: (c) 3 × 10⁸ m s⁻¹.
4. About 99% of the Sun’s energy reaching the Earth falls within which three regions of the electromagnetic spectrum?
(a) Gamma rays, X-rays, and Ultraviolet (UV).
(b) Ultraviolet (UV), Visible, and Infrared (IR).
(c) Microwaves, Radio waves, and Infrared (IR).
(d) X-rays, Visible, and Microwaves.
Ans: (b) Ultraviolet (UV), Visible, and Infrared (IR).
5. The fraction of solar radiation reflected by a surface is known as its:
(a) Insolation.
(b) Solar constant.
(c) Albedo.
(d) Absorption rate.
Ans: (c) Albedo.
6. Which of the following surfaces has the highest albedo (reflects the most solar radiation)?
(a) Ocean water.
(b) Black soil.
(c) Crushed rock.
(d) Snow.
Ans: (d) Snow.
7. What is the approximate value of the solar constant at the top of the Earth’s atmosphere?
(a) 1.0 kW m⁻².
(b) 1.4 kW m⁻².
(c) 2.4 kW m⁻².
(d) 3.6 kW m⁻².
Ans: (b) 1.4 kW m⁻².
8. Which pioneering Indian atmospheric scientist co-authored the book Solar Radiation Over India in 1982?
(a) C.V. Raman.
(b) K.R. Ramanathan.
(c) Anna Mani.
(d) S. Rangarajan.
Ans: (c) Anna Mani.
9. Why do cities generally experience the “Urban Heat Island Effect” and stay warmer than surrounding rural areas?
(a) Due to high rates of plant transpiration.
(b) Because built-up areas with concrete and asphalt absorb and retain more heat.
(c) Because they receive higher direct solar insolation.
(d) Because rural areas have more greenhouse gases.
Ans: (b) Because built-up areas with concrete and asphalt absorb and retain more heat.
10. Nearly all weather phenomena, such as winds and storms, take place in which layer of the atmosphere?
(a) Stratosphere.
(b) Mesosphere.
(c) Troposphere.
(d) Thermosphere.
Ans: (c) Troposphere.
11. Why does the temperature increase with height in the stratosphere?
(a) Because it is closer to the Sun.
(b) Due to the absorption of UV rays by the ozone layer.
(c) Because warm air rises from the troposphere.
(d) Due to the high concentration of water vapour.
Ans: (b) Due to the absorption of UV rays by the ozone layer.
12. Which of the following is a greenhouse gas responsible for trapping re-radiated infrared heat?
(a) Oxygen (O₂).
(b) Nitrogen (N₂).
(c) Carbon dioxide (CO₂).
(d) Argon.
Ans: (c) Carbon dioxide (CO₂).
13. Which human-made chemicals caused severe ozone loss over Antarctica, commonly known as the ozone hole?
(a) Chlorofluorocarbons (CFCs).
(b) Methane (CH₄).
(c) Nitrogen oxides.
(d) Carbon monoxide.
Ans: (a) Chlorofluorocarbons (CFCs).
14. Which international agreement successfully reduced the use of CFCs to help the ozone layer recover?
(a) Paris Agreement.
(b) Kyoto Protocol.
(c) Montreal Protocol.
(d) Geneva Convention.
Ans: (c) Montreal Protocol.
15. When does a valley breeze typically occur in mountainous regions?
(a) During the night, when the valley floor is warmer.
(b) During the day, when mountain slopes heat up faster than the valley floor.
(c) During heavy rainfall.
(d) Only during the winter season.
Ans: (b) During the day, when mountain slopes heat up faster than the valley floor.
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