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Gr 3 revision - Annual examination
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What is force? How is it helpful to us?
Force is a push or pull applied on an object. Force helps us to move things, stop moving moving things, change direction of an object,
What is shadow? How are shadows formed ? dDifference between morning and noon shadows.
A dark patch formed when an object blocks the path of light. Shadows are longer in the morning and evening and shortest at noon.
Difference between transparent and opaque objects .
Transparent: Objects through which light can pass through. Opaque: Objects through which light cannot pass.
Differentiate between luminous and non- luminous objects.
Luminous : Objects that give out light. Non luminous :- Objects that do not give out light.
How does the change of season seasons occur on the Earth?
The revolution of the Earth around the Sun and the tilted axis of the Earth cause change of season/
Describe the phenomenon of rotation of the Earth
The movement of the earth on its axis. Rotation causes day and night.The earth complete one rotation in 24 hours.The Earth spins from west to east.
Differentiate between orbit and axis.
Orbit:- The fixed paths followed by the planets while moving around the Sun. Axis: An imaginary line passes through the centre of the Earth.
Differentiate between gibbous moo and crescent moon.
Gibbous moon : After 10 days of the new moon and we can see more than half of the moon.Crescent moon:- After three days of the new moon, we can see a small part
Why does the Sun appear bigger than any other star?
Sun is the closest star to the Earth. That is why, it appears so big.
Define a natural satellite. Give one example.
A satellite is an object that revolves around a planet. The moon is the natural satellite of the Earth .
Difference between stars and Planets.
Stars are huge ball of burning gases. They produce heat and light of their own.Planets are huge round objects that go around the Sun.
What are constellations? Name any two.
Group stars that appear to form different patterns or designs in the sky. Orion, Ursa Major
Planets in order
Mercury, Venous, Earth, Mars, Jupiter, Saturn, Uranus, Neptune