SAMPLE PAPER-II
(Based on Chapters 8 to 13)
I. Choose the correct answer.
1. The coldest layer of atmosphere is
(a) troposphere
(b) stratosphere
(c) mesosphere
(d) exosphere
2. In the process of purification of water chlorine tablets are added to
(a) kill the germs in water
(b) remove the soluble impurities from the water
(c) remove the insoluble impurities from the water
(d) remove the suspended impurities from the water
3. The soil is formed by the
(a) fossilisation
(b) weathering of rocks
(c) volcanic eruption
(d) rock cycle
process of
4. Tides are caused due to the
(a) gravity of moon
(b) mass of moon
(c) atmosphere of moon (d) craters of moon
5. A light rock with lots of holes in it is
(a) marble
(b) sandstone
(c) pumice
(d) slate
II. Give one word / sentence answer.
1. Which rock is used to make blackboard and slates ?
2. What is meant by tsunami ?
3. Name the main greehouse gas.
4. Why are eclipses occur ?
5. What is carrying away of top soil by wind or water called ?
III. Give short answer.
What are the different methods used to purify water?
Answers
Answers may be correct
Look through the question number
Explanation:
I
1.(C)
II
1.A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulfate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
2.tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. ... The tsunami was generated by a large earthquake in the Southern Pacific Ocean. Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea.
4.
Sometimes when the moon orbits Earth, it moves between the sun and Earth. When this happens, the moon blocks the light of the sun from reaching Earth. This causes an eclipse of the sun, or solar eclipse. During a solar eclipse, the moon casts a shadow onto Earth.
5.Topsoil is the uppermost layer of the Earth's surface layers. Top soil is soft and light and can be carried away easily. Water and wind cause the topsoil to be removed. This process of carrying of top soil by wind and water is called as soil erosion.
Answer:
1.(c) mesosphere
2.(a) kills the germs in water
3.(b) weathering of rocks
4.(a) gravity of moon
5.(c) pumice
ll
1. lackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
2.A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions.
3.Water vapor,Carbon dioxide,Methane,Ozone,Nitrous oxide,Chlorofluorocarbons
4.Sometimes when the moon orbits Earth, it moves between the sun and Earth so the eclipses occur
5 . soil erosion
lll
The methods used include physical processes such as filtration, sedimentation, and distillation; biological processes such as slow sand filters or biologically active carbon; chemical processes such as flocculation andchlorination; and the use of electromagnetic radiation such as ultraviolet light.
Explanation:
1.The top of the mesosphere is the coldest area of the Earth's atmosphere because temperature may locally decrease to as low as 100 K (-173°C).
2.chlorine has the property to kill the germs in the water
3. soil are formed by weathering of rocks .means corrosion of rocks . lichens play a major roll in it
4.Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth .but mostly due to moons gravity
5.A pumice rock is formed during volcanic eruptions and are extremely porous rocks that are generally light in color. These rocks so light that they can easily float on water until they absorb water in it. These are found in abundance in places where there are numerous volcanic eruptions.
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