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Everyday Science & Environment — Homi Bhabha Class 6 General Knowledge MCQs with Solutions
Free Homi Bhabha Class 6 General Knowledge Everyday Science & Environment MCQs with step-by-step solutions covering Everyday Science Phenomena, Environmental Awareness & Eco-friendly Technologies. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Everyday Science Phenomena · easy · theory
During a storm, why do we usually see the lightning first and hear the thunder a little later?
A. Light travels faster than sound ✓ Correct
B. Our ears are slow
C. Thunder starts much later
D. Sound travels faster than light
Solution: Light travels much faster than sound, so we see the flash before the sound reaches us.
Q2 — Everyday Science Phenomena · easy · theory
Why does a piece of ice float on the surface of water?
A. Water sticks under the ice
B. Ice pushes the water down
C. Ice is lighter (less dense) than water ✓ Correct
D. Ice is heavier than water
Solution: Ice is less dense than water, so it floats instead of sinking.
Q3 — Everyday Science Phenomena · easy · theory
A straw kept in a glass of water looks bent at the surface. This happens because light
A. bends when it passes between water and air ✓ Correct
B. turns into heat
C. stops inside water
D. disappears in water
Solution: Light bends (refracts) as it moves between water and air, making the straw look bent.
Q4 — Everyday Science Phenomena · easy · theory
Why does a wet cloth become dry when it is hung out in the sun?
A. The water evaporates into the air ✓ Correct
B. The cloth drinks the water
C. The water freezes
D. The Sun pushes water away
Solution: Heat from the Sun turns the water into vapour (evaporation), so the cloth dries.
Q5 — Everyday Science Phenomena · easy · theory
You can see your own face in a mirror because light
A. bounces back (reflects) from the mirror ✓ Correct
B. passes through the mirror
C. is made by the mirror
D. is absorbed by the mirror
Solution: A mirror reflects light back to our eyes, so we see our image.
Q6 — Everyday Science Phenomena · easy · theory
A rainbow appears in the sky after rain because tiny water drops
A. block the Sun
B. heat the sunlight
C. split sunlight into different colours ✓ Correct
D. make brand new light
Solution: Water droplets split white sunlight into its seven colours, forming a rainbow.
Q7 — Everyday Science Phenomena · easy · theory
Why does our body sweat on a hot day?
A. To help cool the body down ✓ Correct
B. To make us tired
C. To warm the body more
D. To make us dirty
Solution: Sweat evaporates from the skin and takes away heat, which cools the body.
Q8 — Everyday Science Phenomena · easy · theory
A dark shadow forms behind you in sunlight because
A. light travels in straight lines and your body blocks it ✓ Correct
B. your body makes darkness by itself
C. the Sun switches off
D. light bends around you
Solution: Light travels in straight lines; your body blocks it, leaving a shadow behind you.
Q9 — Environmental Awareness & Eco-friendly Technologies · easy · theory
The three Rs of caring for the environment are Reduce, Reuse and
A. Return
B. Repeat
C. Remove
D. Recycle ✓ Correct
Solution: The three Rs are Reduce, Reuse and Recycle, which help cut down waste.
Q10 — Environmental Awareness & Eco-friendly Technologies · easy · theory
Which of these is a renewable source of energy that will never run out?
A. Diesel
B. Petrol
C. Sunlight ✓ Correct
D. Coal
Solution: Sunlight is renewable and endless, while coal, petrol and diesel get used up.
Q11 — Environmental Awareness & Eco-friendly Technologies · easy · theory
Which gas do green plants release that humans need to breathe in?
A. Nitrogen
B. Carbon dioxide
C. Smoke
D. Oxygen ✓ Correct
Solution: Plants give out oxygen, which we breathe in to stay alive.
Q12 — Environmental Awareness & Eco-friendly Technologies · easy · theory
Which of these is biodegradable waste, meaning waste that rots naturally?
A. Vegetable peels ✓ Correct
B. Plastic bottle
C. Aluminium can
D. Glass jar
Solution: Vegetable peels rot and mix back into the soil; plastic, glass and metal do not.
Q13 — Environmental Awareness & Eco-friendly Technologies · easy · theory
A solar panel on a rooftop mainly converts sunlight into
A. electricity ✓ Correct
B. sound
C. plastic
D. water
Solution: Solar panels change sunlight directly into electricity.
Q14 — Environmental Awareness & Eco-friendly Technologies · easy · theory
Which way of travelling causes almost no air pollution?
A. Riding a bicycle ✓ Correct
B. Taking a diesel bus
C. Driving a car
D. Riding a motorcycle
Solution: A bicycle runs on your own effort and gives out no smoke, so it causes no air pollution.
Q15 — Environmental Awareness & Eco-friendly Technologies · easy · theory
While shopping, which bag is the more eco-friendly choice?
A. A foam box
B. A thin plastic bag
C. A cloth bag that can be reused ✓ Correct
D. A new plastic bag each time
Solution: A cloth bag can be used again and again, so it creates far less waste than plastic.
Q16 — Environmental Awareness & Eco-friendly Technologies · easy · theory
Which habit is the best way to save electricity at home?
A. Using extra heaters
B. Switching off lights and fans when not needed ✓ Correct
C. Keeping all lights on
D. Opening the fridge often
Solution: Turning off lights and fans when they are not needed saves a lot of electricity.
Q17 — Everyday Science Phenomena · hard · numerical
A car travels 60 kilometres in 2 hours. What is its speed?
A. 30 km/h ✓ Correct
B. 62 km/h
C. 15 km/h
D. 120 km/h
Solution: Speed = distance ÷ time = 60 ÷ 2 = 30 km/h.
Q18 — Everyday Science Phenomena · hard · numerical
Using the rule °F = (°C × 9/5) + 32, what is 20°C in Fahrenheit?
A. 100°F
B. 52°F
C. 68°F ✓ Correct
D. 36°F
Solution: 20 × 9/5 = 36, and 36 + 32 = 68, so 20°C = 68°F.
Q19 — Everyday Science Phenomena · hard · theory
Food cooks faster in a pressure cooker because the trapped steam raises the pressure, which makes the water
A. boil at a lower temperature
B. stop boiling
C. turn into ice
D. boil at a higher temperature ✓ Correct
Solution: Higher pressure raises the boiling point of water, so the hotter water cooks food faster.
Q20 — Everyday Science Phenomena · hard · theory
A ship made of heavy iron can float on water, even though a small iron nail sinks, because the ship
A. is hollow and its wide shape pushes aside a lot of water ✓ Correct
B. is lighter than a single nail
C. is freshly painted
D. moves very fast
Solution: The wide, hollow shape pushes aside a lot of water, so the average density stays less than water and the ship floats.
Q21 — Environmental Awareness & Eco-friendly Technologies · hard · theory
An electric car is called more eco-friendly than a petrol car mainly because while running it
A. uses more fuel
B. does not release smoke or harmful gases ✓ Correct
C. moves faster
D. makes a loud noise
Solution: An electric car runs on a battery and gives out no smoke, so it pollutes the air far less.
Q22 — Environmental Awareness & Eco-friendly Technologies · hard · numerical
An old bulb uses 60 watts, while an LED gives the same light using only 10 watts. How much power does the LED save?
A. 50 watts ✓ Correct
B. 6 watts
C. 70 watts
D. 10 watts
Solution: Power saved = 60 − 10 = 50 watts, so the LED uses much less electricity for the same light.
Q23 — Environmental Awareness & Eco-friendly Technologies · hard · theory
The ozone layer high above the Earth protects living things by
A. blocking harmful ultraviolet (UV) rays from the Sun ✓ Correct
B. making rain fall
C. cooling the oceans
D. giving us oxygen
Solution: The ozone layer absorbs most of the harmful ultraviolet rays from the Sun before they reach us.
Q24 — Environmental Awareness & Eco-friendly Technologies · hard · theory
Which everyday activity adds the most extra carbon dioxide to the air?
A. Burning fossil fuels like coal and petrol ✓ Correct
B. Using a solar cooker
C. Cycling to school
D. Planting trees
Solution: Burning fossil fuels such as coal and petrol releases large amounts of carbon dioxide.
Q25 — Everyday Science Phenomena · medium · theory
A metal spoon feels colder to touch than a wooden spoon kept in the same room because metal
A. carries heat away from your hand faster ✓ Correct
B. is much heavier
C. is always cold inside
D. has no heat at all
Solution: Metal is a good conductor and carries heat away from your hand quickly, so it feels colder.
Q26 — Everyday Science Phenomena · medium · theory
If you drop a stone and a feather together in air, the stone reaches the ground first mainly because
A. air resistance slows the light feather more ✓ Correct
B. the stone is magic
C. the feather is heavier
D. gravity pulls only the stone
Solution: Air pushes against the light feather and slows it down, so the stone lands first.
Q27 — Everyday Science Phenomena · medium · theory
Warm air rises upward in a room because warm air is
A. made of water
B. lighter (less dense) than cold air ✓ Correct
C. a solid
D. heavier than cold air
Solution: When air is heated it becomes lighter (less dense), so it rises above the cooler air.
Q28 — Everyday Science Phenomena · medium · theory
You hear an echo in a big empty hall because sound
A. turns into light
B. simply disappears
C. is created by the walls
D. bounces back (reflects) off the walls ✓ Correct
Solution: Sound reflects off the hard walls and returns to your ears as an echo.
Q29 — Everyday Science Phenomena · medium · theory
Sugar dissolves faster in hot water than in cold water because in hot water the tiny particles
A. become much bigger
B. turn into gas
C. move faster and mix quickly ✓ Correct
D. stop moving
Solution: In hot water the particles move faster, so the sugar mixes and dissolves more quickly.
Q30 — Everyday Science Phenomena · medium · theory
A balloon rubbed on your hair can stick to a wall because of
A. gravity
B. air pressure
C. magnetism
D. static electricity ✓ Correct
Solution: Rubbing builds up static electric charge on the balloon, which makes it cling to the wall.