ACME ACADEMY

WEEKLY EVALUATION TEST

Subject: Science
Time Limit: 20 Mins
Max Marks: 20 Marks
Student Name:
Roll Number:
Class / Sec:
Date:

GENERAL INSTRUCTIONS:

  1. All questions are compulsory. Carefully read all instructions before starting.
  2. The question paper contains 20 questions.
  3. There is no negative marking for incorrect answers.
  4. Use of mobile phones, smartwatches, or calculators is strictly prohibited during the exam.
1. Which of the following is the primary source of energy that drives the Earth's weather, ocean currents, and biological processes?
[1 Mark]
(A) Geothermal energy from the Earth's core
(B) Solar radiation
(C) Lunar gravity
(D) Fossil fuels
2. In which layer of the Earth's atmosphere do almost all weather phenomena (like clouds, rain, and storms) occur?
[1 Mark]
(A) Stratosphere
(B) Mesosphere
(C) Troposphere
(D) Thermosphere
3. What is 'albedo' in the context of Earth's climate?
[1 Mark]
(A) The amount of greenhouse gas in the air.
(B) The fraction of solar radiation reflected by a surface.
(C) The total amount of rain in a year.
(D) The speed of ocean currents.
4. Which gas makes up the largest percentage (78%) of the Earth's atmosphere?
[1 Mark]
(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon
5. Which natural process continuously removes carbon dioxide from the atmosphere and converts it into organic matter?
[1 Mark]
(A) Respiration
(B) Combustion of fossil fuels
(C) Photosynthesis
(D) Volcanic eruptions
6. Why are the equatorial regions of the Earth significantly warmer than the polar regions?
[1 Mark]
(A) The equator is thousands of miles closer to the Sun.
(B) The Earth's internal heat escapes mainly at the equator.
(C) The Sun's rays strike the equator directly, concentrating energy over a smaller area, whereas they strike the poles at an angle.
(D) There is no atmosphere at the equator.
7. How does the 'greenhouse effect' naturally warm the Earth?
[1 Mark]
(A) Greenhouse gases absorb incoming harmful UV radiation.
(B) Greenhouse gases trap outgoing infrared heat re-radiated by the Earth's surface, preventing it from escaping into space.
(C) Greenhouse gases act like magnifying glasses, increasing solar intensity.
(D) Greenhouse gases undergo continuous combustion in the sky.
8. What causes the phenomenon known as the 'Urban Heat Island' effect?
[1 Mark]
(A) Cities have more trees which trap heat.
(B) Urban materials like concrete and asphalt absorb solar radiation during the day and re-radiate it as heat at night.
(C) Cities are physically located closer to the Sun.
(D) The concentration of water vapor is lower in cities.
9. In a mountainous region during the daytime, the mountain slopes heat up faster than the valley floor. What type of wind pattern does this create?
[1 Mark]
(A) A downward mountain breeze
(B) A planetary trade wind
(C) An upward-flowing valley breeze
(D) A hurricane
10. What is the primary role of the ozone layer in the stratosphere?
[1 Mark]
(A) To provide oxygen for high-flying birds.
(B) To absorb harmful ultraviolet (UV) radiation from the Sun.
(C) To trap all greenhouse gases.
(D) To reflect visible light back into space.
11. The continuous movement of large masses of ocean water forms circular patterns called gyres. What causes these currents to deflect and curve rather than move in straight lines?
[1 Mark]
(A) The pull of the moon.
(B) The rotation of the Earth on its axis (Coriolis effect).
(C) Underwater volcanoes.
(D) Ships moving across the ocean.
12. What is the environmental consequence of excess nitrogen (from agricultural fertilisers) washing into lakes and rivers?
[1 Mark]
(A) It purifies the water instantly.
(B) It causes eutrophication, leading to massive algal blooms that deplete oxygen and kill fish.
(C) It evaporates and restores the ozone layer.
(D) It turns the water into a solid block of ice.
13. Assertion (A): Melting of polar ice caps accelerates global warming. Reason (R): Ice has a high albedo and reflects most solar radiation; when it melts, the dark ocean water exposed absorbs more heat.
[1 Mark]
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
14. If the solar constant is approximately 1.4 kW/m^2, how much total solar energy hits a 2 m^2 solar panel at the top of the atmosphere in 10 seconds?
[1 Mark]
(A) 2.8 kJ
(B) 14 kJ
(C) 28 kJ
(D) 140 kJ
15. In the nitrogen cycle, which organisms are primarily responsible for 'nitrogen fixation'?
[1 Mark]
(A) Green plants during photosynthesis
(B) Decomposers like fungi
(C) Specialised bacteria like Rhizobium in legume roots
(D) Herbivorous animals
16. How does deforestation directly disrupt the water cycle in a local area?
[1 Mark]
(A) It increases the amount of groundwater instantly.
(B) It reduces transpiration from leaves, leading to less moisture in the air and a potential decline in local rainfall.
(C) It increases the salinity of nearby oceans.
(D) It stops all evaporation from rivers.
17. The 'slow' carbon cycle involves which of the following processes?
[1 Mark]
(A) The daily exchange of CO2 through animal respiration.
(B) The rapid burning of a forest.
(C) The burial of dead organic matter over millions of years to form fossil fuels.
(D) The seasonal shedding of leaves.
18. What was the significance of the artificial Haber-Bosch process developed in the early 1900s?
[1 Mark]
(A) It stopped the depletion of the ozone layer.
(B) It allowed humans to artificially fix atmospheric nitrogen to create synthetic fertilisers, revolutionising global agriculture.
(C) It solved the problem of global warming by absorbing CO2.
(D) It created synthetic water.
19. Why does temperature increase with altitude in the stratosphere, unlike in the troposphere?
[1 Mark]
(A) Because it is closer to the sun.
(B) Because hot air always rises.
(C) Because the ozone layer absorbs high-energy UV radiation, heating the surrounding air.
(D) Because planes fly there and release heat.
20. When atmospheric CO2 levels rise due to fossil fuel combustion, the oceans absorb more CO2. What is a major negative consequence of this for the marine biosphere?
[1 Mark]
(A) It makes the ocean water boil.
(B) It causes ocean acidification, which threatens corals and shell-building marine organisms.
(C) It turns the oceans into freshwater.
(D) It immediately freezes the polar oceans.
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