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WorksheetsLight, Shadows and Reflections - 2_2
Total questions: 43
Worksheet time: 37mins
What exactly are shadows?
AN IMAGE WITH COLOURS
When an opaque object comes in the path of light
An plain image
What do green plants use during photosynthesis?
Light Energy of the sun
What two essential things does photosynthesis produce?
(a) Starch and oxygen
(b) Heat and light
(c) Water and carbon dioxide
(d) Nitrogen and hydrogen
Where does the energy in wood burning for cooking or warmth come from?
We utilise Sun's energy locked in plants
How did the energy in fossil fuels like coal and gas get there?
From light energy of the Sun. From the remains of plants and animals that lived millions of years ago.
Which one of the following is NOT directly dependent on sunlight energy?
How far apart were Galileo and his assistant when they attempted to measure the speed of light?
(a) A few meters
(b) Around one kilometer
(c) Several kilometers
(d) It's not mentioned in the passage.
What did Galileo and his assistant hold in their hands?
(a) Telescopes
(b) Stopwatches
(c) Lanterns with shutters
(d) Mirrors
How did Galileo's assistant know when to open their lantern's shutter?
(a) By following a pre-arranged signal
(b) By counting to a specific number
(c) By seeing Galileo's lantern flash
(d) It's not explained in the passage.
What did Galileo expect to find by dividing the distance between them by the measured time?
(a) The distance to the nearest star
(b) The age of the universe
(c) The size of the Earth
(d) The speed of light
Why was Galileo's experiment unsuccessful?
(a) The lanterns weren't bright enough
(b) The hilltops were too close together
(c) Human reaction time is too slow for such measurements
(d) They forgot to account for the Earth's rotation
______ holds the record for the fastest speed,
How fast, in kilometers per second, does light travel in air?
300,000 kilometers per second
How fast will light travel between Delhi and Chennai?
1/200 rd of a second
1/150 th of a second
1/100 th of a second
1/125 th of a second
Can any object travel as fast as light?
How long does it take for the light from a distant star to reach Earth?
a) Thousands of years
b) Hundreds of years
c) Millions of years
d) Light travels instantly from stars
What is the distance between the Earth and the Sun
100 million miles (1600 lakh kilometers)
93 million miles (1485 lakh kilometers)
Light travels from the sun to the Earth in ______ minutes
8.5
Light takes several years to travel between the Sun and the Earth
Why does light take millions of years to travel from some stars to the Earth?
What do you see when you look up to see the stars?
a) Present-day appearance of stars
b) Reflection of Earth's light
c) Stars as they are right now
d) Past appearance of stars
If a far-off star explodes today, when will the explosion be visible on Earth?
a) Immediately
b) Thousands of years later
c) Millions of years later
d) It will never be visible on Earth
What are the natural sources of light?
The sun, stars, firefly and fire
Name some Man-made sources of light.
light bulb
luminous object
non-luminous object
table
luminous object
non-luminous object
torch
luminous object
non-luminous object
window
luminous object
non-luminous object
glow worm
luminous object
non-luminous object
firefly
luminous object
non-luminous object
mirror
luminous object
non-luminous object
earth
luminous object
non-luminous object
fire
luminous object
non-luminous object
moon
luminous object
non-luminous object
What are Luminous objects?
What CANNOT luminous objects do?
show light
reflect light
give off
emit light
What are non luminous objects?
Why can we see objects clearly during the day?
Because of the ample natural light available during the day which is reflected by the object
Moon is a _________ (luminous/non-luminous) object
What is the luminosity status of both the Moon and the Earth?
How do the Moon and Earth acquire their light?
What term describes the phenomenon of the Moon and Earth reflecting light from another source?
Borrowed light
Where do the Moon and Earth primarily borrow their light from?
