1.Fill in the blanks
a. Rocks containing minerals from which metals that can be extracted are called __________.
b. The ___________becomes thinner as we go higher and breathing becomes more difficult.
c. The ________________ is the only natural satellite of the Earth.
d. The _______________is the natural surroundings in which a living thing lives and survives.
e. Natural events that cause great damage to life and property are called natural __________.
2. Choose the correct answer
a. This is a communication satellite.
a. GOES-8 b. APOLLO 11 C. SPUTNIK 1 d. INSAT- 4CR
b. Which machine should Kiran use for lifting his car to change its tyres?
a. lever b. ramp c. screw jack d. wheel and axle
c. Bacteria and fungi are known as
a. producers b. decomposers
c. primary consumers d. secondary consumers
d. This is not an effect of global warming.
a. Spilling of oil or petroleum b. Rise in level of water in oceans
c. Melting of polar icecaps d. Flooding of places near the sea
e. Floods can be prevented by
a. farming b. overgrazing
c deforestation d. building more embankments on rivers
3. State TRUE or FALSE
a. Air is a mixture of many gases.
b. The moon shines because it reflects the light of the Sun.
c. A pair of tongs is an example of second class lever
d. During photosynthesis plants take in oxygen and give out carbon dioxide.
e. Aftershock causes the ground to shake some hours or even days after a major earthquake.
4. Match the following
a. Gneiss Fossils
b. Sandstone Mica
c. Igneous rock Red Fort
d. White Marble Pumice
e. Sedimentary rock Taj Mahal
5 Name the rock that looks like pebbles cemented together with minerals.
6 Name two gemstones.
7 What happens when Raju grazes his cattle in the same grassland again and again?
8 It is not possible to hear any sound on the surface of the moon, why is it so?
9 In which layer of the atmosphere do jet planes fly?
10 When a glass is placed over a burning candle, the flame goes off after a few seconds. Which property of air is shown by this activity?
11 What would be your weight on the Moon, if you weigh 30kg on Earth?
12 Name the fertile layer of the soil that has humus required for the growth of plants.
13 Winding roads are an example of the application of which type of simple machine?
14 A wheel becomes a simple machine when an axle is added to turn the wheel. What is such a machine called?
15 Which gas is used by plants during respiration?
16 What does a food chain show?
17 Can planting trees reduce global warming? How?
18 We should not throw plastic bottles and cans into the garbage bins. Why?
19 In severe drought, people die of shortage of food. Name this disaster.
20 Doctors accompany rescue workers when they go to flood affected areas. Why is it necessary? ( 1 point)
21 What changes can be observed near the sea during cyclones?
22 How does the army help people affected by cyclones and floods? (mention one service)
23 After reading an article on, “Wealth from Rocks” Manu said to Manju, “We should use coal and petroleum wisely.”
a. Why should we use these fuels wisely?
b. List any two products obtained from petroleum.
24 a. Soil erosion by wind is greatest in a desert. Why?
b. Give reason. Farmers leave the stumps and roots of harvested crops on the field.
25 a. What is afforestation?
b. How do the shelter belts help in reducing soil erosion?
26 a. Water is made fit for drinking in the city waterworks. List the processes involved.
b. Why is the filtered water treated with chlorine?
27 a. When an inverted mug is introduced into a bucket of water, water does not rush into the mug. Which property of air is shown by this activity?
b. Give one use of distilled water.
28 Differentiate between solar eclipse and lunar eclipse.
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