Day-to-Day Science Questions (Daily Uses of Science)
1. What gas do we inhale from the atmosphere for respiration?
A) Nitrogen
B) Carbon dioxide
C) Oxygen
D) Hydrogen
Answer: C) Oxygen
2. Which device helps us to cook food faster using steam pressure?
A) Oven
B) Microwave
C) Pressure Cooker
D) Toaster
Answer: C) Pressure Cooker
3. Which vitamin is synthesized in our skin with the help of sunlight?
A) Vitamin A
B) Vitamin B12
C) Vitamin D
D) Vitamin C
Answer: C) Vitamin D
4. Which part of the refrigerator is responsible for cooling?
A) Heater
B) Compressor
C) Motor
D) Lamp
Answer: B) Compressor
5. What type of energy is used in a ceiling fan?
A) Solar energy
B) Sound energy
C) Electrical energy
D) Chemical energy
Answer: C) Electrical energy
6. Which gas is filled in LPG cylinders used at home?
A) Methane
B) Butane
C) Propane
D) Both B and C
Answer: D) Both B and C
7. Which simple machine is used in scissors?
A) Pulley
B) Wedge
C) Lever
D) Wheel
Answer: C) Lever
8. What is the use of detergent in washing clothes?
A) Adds color
B) Reduces friction
C) Removes dirt and oil
D) Increases weight
Answer: C) Removes dirt and oil
9. Which component in toothpaste helps prevent tooth decay?
A) Calcium
B) Iron
C) Fluoride
D) Sodium
Answer: C) Fluoride
10. What kind of lens is used in spectacles for correcting short-sightedness?
A) Convex
B) Concave
C) Cylindrical
D) Plane
Answer: B) Concave
More Practical Science Questions
11. Which type of energy is stored in a battery?
Answer: Chemical energy
12. Why is salt used in preserving pickles?
Answer: It prevents bacterial growth by absorbing moisture.
13. What is the purpose of using a fuse in electrical circuits?
Answer: To prevent damage due to excess current.
14. Why do we feel cool after sweating?
Answer: Because evaporation absorbs heat from the body.
15. Which gas makes soda water fizzy?
Answer: Carbon dioxide (CO₂)
16. Which metal is commonly used in kitchen foils?
Answer: Aluminium
17. Why are solar panels usually black or dark in color?
Answer: To absorb more sunlight and convert it into energy.
18. What is the main function of a water purifier?
Answer: To remove impurities and germs from water.
19. Why is hand sanitizer effective against viruses?
Answer: Because it contains alcohol that kills germs.
20. What do we use to measure body temperature?
Answer: Thermometer
21. What is the white substance in toothpaste that cleans teeth?
Answer: Calcium carbonate
22. Which home appliance converts electrical energy into sound?
Answer: Speaker
23. Why is food stored in the refrigerator?
Answer: To slow down the growth of bacteria and keep it fresh longer.
24. What gas is produced when we exhale?
Answer: Carbon dioxide
25. Which science principle helps airplanes to fly?
Answer: Bernoulli's Principle (in Aerodynamics)
Day-to-Day Science Questions – Set 2
1. Which part of the mobile phone allows us to see images and videos?
A) Battery
B) Screen
C) Antenna
D) Charger
Answer: B) Screen
2. Why do ice cubes melt faster when placed under sunlight?
A) Due to reflection
B) Due to absorption of heat
C) Due to evaporation
D) Due to radiation
Answer: B) Due to absorption of heat
3. Which substance is used in antiseptic creams to prevent infection?
A) Sodium
B) Zinc oxide
C) Mercury
D) Iodine
Answer: D) Iodine
4. Which home appliance uses microwave radiation to cook food?
Answer: Microwave oven
5. Why do electric bulbs get hot after use?
Answer: Because part of electrical energy is converted into heat.
6. What is the reason for rusting of iron?
Answer: Reaction with oxygen and moisture (air + water)
7. What kind of mirror is used in vehicles to see a wider view?
Answer: Convex mirror
8. Why do doctors use stethoscopes?
Answer: To listen to heartbeat and breathing sounds
9. What kind of energy is used in solar calculators?
Answer: Solar energy (light energy converted to electrical energy)
10. Why are metals used in making cooking utensils?
Answer: Because they are good conductors of heat
11. Which substance causes the bubbles in soap water?
Answer: Air or gas trapped in soap film
12. Why is the sky blue in color?
Answer: Due to scattering of sunlight by air molecules
13. Which device is used to measure blood pressure?
Answer: Sphygmomanometer
14. Why do we wear cotton clothes in summer?
Answer: Cotton absorbs sweat and allows air circulation
15. Why do onions make us cry?
Answer: They release a gas (sulfur compound) that irritates the eyes
16. Which part of the computer is called the "brain"?
Answer: CPU (Central Processing Unit)
17. Why do we see lightning before we hear thunder?
Answer: Because light travels faster than sound
18. What is used to check eyesight in clinics?
Answer: Snellen Chart
19. Why do we apply deodorant or perfume?
Answer: To mask or reduce body odor caused by bacteria
20. What process helps plants make food from sunlight?
Answer: Photosynthesis
21. Which gas helps in the combustion of fuels?
Answer: Oxygen
22. What makes a magnet attract iron nails?
Answer: Magnetic force
23. Which device converts sound into electrical signals in telephones?
Answer: Microphone
24. Why do we boil water before drinking in some areas?
Answer: To kill bacteria and make it safe
25. Which household item helps us measure weight?
Answer: Weighing machine
Day-to-Day Science – Set 3 (25 Questions)
1. Which chemical is used in mosquito repellents like coils or liquids?
A) Acetone
B) DEET
C) Chlorine
D) Alcohol
Answer: B) DEET
2. Which scientific principle is used in pressure cookers?
Answer: Increase in pressure raises the boiling point of water
3. Why does butter melt on a hot pan?
Answer: Due to heat transfer (melting due to temperature rise)
4. What is the use of baking soda in the kitchen?
Answer: It helps dough rise by releasing carbon dioxide
5. Why are copper wires used in electric wiring?
Answer: Copper is a good conductor of electricity
6. Which type of lens is used in magnifying glasses?
Answer: Convex lens
7. Why do we feel colder when wet on a windy day?
Answer: Evaporation of water absorbs body heat
8. Which substance is used in fire extinguishers to stop fire?
Answer: Carbon dioxide (CO₂)
9. Which device helps regulate temperature in air conditioners?
Answer: Thermostat
10. Why do milk and dairy products spoil quickly in summer?
Answer: Because bacteria multiply faster in warm conditions
11. What causes sound in speakers?
Answer: Vibration of a diaphragm inside the speaker
12. Which vitamin is mainly found in citrus fruits?
Answer: Vitamin C
13. What is the white solid used in chalks?
Answer: Calcium carbonate
14. Why do we add chlorine to drinking water?
Answer: To kill harmful microorganisms
15. What kind of force helps to keep clothes stuck in a spinning washing machine?
Answer: Centripetal force
16. What makes glass transparent?
Answer: Its molecules allow light to pass without scattering
17. Which fuel is used in vehicles like scooters and bikes?
Answer: Petrol (Gasoline)
18. What is the main ingredient in soaps and shampoos for cleaning?
Answer: Surfactants
19. Which machine converts kinetic energy into electricity in dams?
Answer: Turbine
20. Which vitamin is essential for healthy eyes?
Answer: Vitamin A
21. Why is food packed in vacuum-sealed containers?
Answer: To prevent growth of bacteria by removing oxygen
22. What causes fog on bathroom mirrors after a hot shower?
Answer: Condensation of water vapor
23. Why is iron coated with paint?
Answer: To prevent rusting (oxidation)
24. Which scientific tool is used to measure humidity?
Answer: Hygrometer
25. Why do mirrors reflect our image?
Answer: Due to the smooth polished surface that reflects light
Day-to-Day Science – Set 4 (25 Questions)
1. Which part of a plant is used for making sugar in the sugar industry?
A) Roots
B) Stem
C) Leaves
D) Flowers
Answer: B) Stem (Sugarcane stem)
2. Why do metal utensils make noise when hit?
Answer: Metals are good conductors of sound and vibrate easily
3. What helps clothes dry faster on a sunny day?
Answer: Increased evaporation due to sunlight and heat
4. Why does cutting an onion release a pungent smell?
Answer: It releases sulfur-containing compounds
5. What type of change is boiling water?
Answer: Physical change
6. Why does a balloon burst when pricked?
Answer: Air pressure inside pushes out suddenly
7. Which part of the body detects smell?
Answer: Nose (Olfactory receptors)
8. What is the scientific reason behind wearing wool in winter?
Answer: Wool traps air and acts as an insulator to retain heat
9. Which device is used to store food for a long time at low temperatures?
Answer: Refrigerator
10. What gas is given off by plants during photosynthesis?
Answer: Oxygen
11. What makes chili taste spicy?
Answer: Capsaicin compound
12. Which part of the eye helps us see in dim light?
Answer: Rod cells
13. Why does rubbing hands produce heat?
Answer: Due to friction
14. What helps convert milk into curd?
Answer: Lactic acid bacteria
15. Why is turmeric used as an antiseptic?
Answer: It contains curcumin, which has antibacterial properties
16. What happens when salt is added to ice?
Answer: It lowers the melting point of ice
17. What instrument is used to see tiny organisms?
Answer: Microscope
18. Why do we hear an echo in a large empty hall?
Answer: Due to reflection of sound waves
19. What form of energy is stored in food?
Answer: Chemical energy
20. Which gas is essential for burning?
Answer: Oxygen
21. What is the use of a thermometer?
Answer: To measure temperature
22. Why is plastic not used for cooking utensils?
Answer: It melts easily and is a poor heat conductor
23. What makes a magnet stick to a fridge?
Answer: Magnetic force between the magnet and iron in the fridge
24. Which gas is filled in balloons to make them float?
Answer: Helium
25. What is formed when vinegar is added to baking soda?
Answer: Carbon dioxide gas (causes fizzing reaction)
Day-to-Day Science – Set 5 (25 Questions)
1. Why do electric iron boxes have a temperature control knob?
Answer: To regulate heat according to fabric type
2. Which natural fibre is used to make jute bags?
Answer: Jute
3. Which process separates tea leaves from tea after brewing?
Answer: Filtration
4. Why is petrol highly flammable?
Answer: It has a low ignition point and produces vapours easily
5. What causes the red color of ripe tomatoes?
Answer: Lycopene pigment
6. Which organ in our body acts as a natural filter for blood?
Answer: Kidneys
7. Why is sunlight important for clothes drying?
Answer: Sunlight provides heat for faster evaporation of water
8. Which gas in soft drinks causes fizz?
Answer: Carbon dioxide
9. Why does an iron gate get hot in the sun?
Answer: Iron is a good conductor of heat
10. What type of change is burning of paper?
Answer: Chemical change
11. What helps the bicycle to move smoothly?
Answer: Ball bearings reduce friction
12. Which liquid is used in car batteries?
Answer: Sulphuric acid
13. Why do athletes drink glucose water?
Answer: It gives instant energy
14. What is the purpose of a pressure cooker whistle?
Answer: To release excess steam and maintain safe pressure
15. What is the main ingredient in table salt?
Answer: Sodium chloride (NaCl)
16. Why does butter solidify in a refrigerator?
Answer: Low temperature freezes fat molecules
17. Which household appliance uses centrifugal force?
Answer: Washing machine (during spin cycle)
18. Which mineral is important for strong bones?
Answer: Calcium
19. Why is handwashing with soap effective?
Answer: Soap breaks down oils and removes germs
20. What is used to measure length accurately at home?
Answer: Measuring tape or scale
21. Why is a black umbrella better in summer?
Answer: Actually, it absorbs heat but blocks sunlight effectively
22. What causes milk to turn sour?
Answer: Lactic acid produced by bacteria
23. What is the main component of air that we breathe?
Answer: Nitrogen (about 78%)
24. Why are pressure cookers more efficient than open pots?
Answer: They cook food faster by increasing boiling point under pressure
25. Which device helps to watch distant objects clearly?
Answer: Telescope
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