Everyday Science – 100 MCQs

1. Normal body temperature:

• 37°C (98.6°F)
• 40°C (104°F)
• 35°C (95°F)
• 42°C (107.6°F)

2. Normal adult blood pressure is:

• 120/80 mmHg
• 140/90 mmHg
• 90/60 mmHg
• 160/100 mmHg

3. Insulin regulates:

• Blood sugar
• Blood pressure
• Cholesterol
• Body temperature

4. Antibiotics treat:

• Bacterial infections
• Viral infections
• Fungal infections
• All of these

5. Defibrillators treat:

• Irregular heartbeats
• High cholesterol
• Low blood sugar
• Broken bones

6. A sphygmomanometer measures:

• Blood pressure
• Blood sugar
• Body temp
• Lung capacity

7. Signs of heart attack:

• Chest pain, arm numbness
• Blurred vision
• Skin itching
• Hair loss

8. Normal resting heart rate:

• 60-100 bpm
• 30-50 bpm
• 120-150 bpm
• 160-200 bpm

9. Anemia is caused by:

• Iron deficiency
• Calcium lack
• Vitamin C lack
• Protein lack

10. Baking soda is:

• Sodium bicarbonate
• Sodium chloride
• Calcium carbonate
• Potassium nitrate

11. Non-stick pans use:

• Teflon
• Aluminum
• Copper
• Ceramic

12. Fire extinguisher powder:

• Sodium bicarbonate
• Salt
• Sugar
• Flour

13. Hard water contains:

• Calcium/Magnesium
• Sodium
• Iron
• Potassium

14. Pressure cookers work by:

• Increasing boiling point
• More air circulation
• Less water
• Thicker walls

15. Stainless steel is:

• Iron + Chromium
• Copper + Zinc
• Aluminum + Tin
• Silver + Gold

16. Food preservatives:

• Prevent bacterial growth
• Add nutrients
• Improve taste
• Change color

17. LPG contains:

• Propane/Butane
• Methane
• Ethane
• Nitrogen

18. Vinegar is:

• Acetic acid
• Citric acid
• Sulfuric acid
• Hydrochloric acid

19. Microwave heating uses:

• Radio waves
• Infrared
• Ultraviolet
• X-rays

20. Refrigerant gas is:

• Freon
• Oxygen
• Nitrogen
• Hydrogen

21. Aluminum foil blocks:

• Heat/light
• Sound
• Radiation
• Electricity

22. Best food storage:

• Airtight containers
• Open bowls
• Paper bags
• Cloth covers

23. Egg freshness test:

• Float in water
• Color check
• Smell test
• Shake test

24. Vitamin C source:

• Citrus fruits
• Meat
• Dairy
• Grains

25. Iron prevents:

• Anemia
• Diabetes
• Hypertension
• Arthritis

26. Egg’s main nutrient:

• Protein
• Carbs
• Fat
• Fiber

27. Omega-3 source:

• Fish
• Red meat
• Dairy
• Processed food

28. Calcium helps:

• Bones/teeth
• Eyesight
• Digestion
• Hair growth

29. Fiber aids:

• Digestion
• Eyesight
• Immunity
• Hearing

30. Vitamin A source:

• Carrots
• Citrus
• Meat
• Grains

31. Water percentage in body:

• 60%
• 30%
• 80%
• 40%

32. Antioxidants protect against:

• Cell damage
• Dehydration
• Overeating
• Sunburn

33. Sugar excess causes:

• Diabetes
• Anemia
• Arthritis
• Asthma

34. Protein builds:

• Muscles
• Bones only
• Fat only
• Skin only

35. Vitamin D source:

• Sunlight
• Meat
• Grains
• Vegetables

36. Pasteurization kills:

• Harmful bacteria
• All nutrients
• Color
• Taste

37. Caffeine is found in:

• Coffee/tea
• Milk
• Water
• Vegetables

38. WiFi uses:

• Radio waves
• Sound waves
• Light waves
• Magnetic waves

39. Touchscreens detect:

• Electrical charges
• Heat
• Pressure
• Sweat

40. GPS works via:

• Satellites
• Cell towers
• Radio stations
• Internet cables

41. Bluetooth range:

• 10 meters (33 ft)
• 100 meters
• 1 kilometer
• 10 kilometers

42. QR codes store:

• Information in squares
• Barcode lines
• Colors
• Magnetic strips

43. Cloud storage is:

• Online data storage
• Physical hard drives
• USB sticks
• DVDs

44. Two-factor authentication:

• Extra security step
• Faster login
• No password
• Less security

45. Phishing emails try to:

• Steal information
• Sell products
• Share news
• Give gifts

46. Software updates:

• Improve security
• Slow devices
• Delete files
• No benefit

47. Strong passwords contain:

• Letters, numbers, symbols
• Only letters
• Simple words
• Personal info

48. Malware is:

• Harmful software
• Hardware
• Internet speed
• Storage type

49. Data backup importance:

• Prevents data loss
• No benefit
• Slows devices
• Costs money

50. Internet cookies:

• Track site preferences
• Viruses
• Hardware parts
• Speed tests

51. VPN provides:

• Privacy online
• Faster internet
• Free software
• More storage

52. Streaming uses:

• Internet data
• Satellite TV
• Radio waves
• Printed media

53. Dark web is:

• Unindexed internet
• Faster internet
• Free internet
• Offline storage

54. Ozone layer protects from:

• UV radiation
• Infrared
• Microwaves
• X-rays

55. Renewable energy sources:

• Solar/wind
• Coal
• Natural gas
• Petroleum

56. Recycling symbols show:

• Material type
• Price
• Weight
• Color

57. Air pollution causes:

• Respiratory diseases
• Stronger bones
• Better sleep
• Improved vision

58. Climate change evidence:

• Rising temperatures
• More snow
• Less sunlight
• Cleaner air

59. LED bulbs save energy by:

• Less heat production
• More brightness
• Larger size
• Higher cost

60. Greenhouse effect is:

• Heat trapping
• Cooling
• Wind creation
• Rain formation

61. Deforestation causes:

• Habitat loss
• More rain
• Cleaner air
• Cooler climate

62. Non-renewable resource:

• Fossil fuels
• Wind
• Sunlight
• Water

63. Wildlife corridors help:

• Animal migration
• Hunting
• Deforestation
• Urbanization

64. Airbags protect by:

• Cushioning impact
• Preventing rollovers
• Improving visibility
• Reducing noise

65. Seat belts reduce injury by:

• Distributing force
• Warming passengers
• Providing comfort
• Looking stylish

66. Anti-lock brakes prevent:

• Wheel lockup
• Faster stopping
• Better mileage
• Smoother ride

67. Electric vehicles charge via:

• Power outlets
• Gas stations
• Solar only
• Wind only

68. Traffic lights sequence:

• Red → Green → Yellow
• Green → Red → Yellow
• Yellow → Red → Green
• Random

69. Roundabouts improve:

• Traffic flow
• Speed limits
• Parking
• Pedestrian access

70. The purpose of a circuit breaker is to:

• Prevent electrical overload
• Increase voltage
• Store electricity
• Reduce energy bills

71. Hard water stains can be removed with:

• Vinegar
• Salt
• Sugar
• Oil

72. Two-factor authentication requires:

• Password + verification code
• Two passwords
• Fingerprint + retina scan
• Voice recognition

73. Goosebumps occur when:

• Tiny muscles contract around hair follicles
• Blood vessels expand
• Nerves misfire
• Skin dries out

74. Bubbles form in boiling water due to:

• Water vaporizing into gas
• Chemical reactions
• Dissolved air escaping
• Impurities rising

75. Static cling occurs because:

• Materials gain/lose electrons
• Humidity disappears
• Fibers shrink
• Dirt accumulates

76. Why does metal feel colder than wood at room temp?

• Conducts heat away from skin faster
• Always lower temperature
• Reflects body heat
• Contains moisture

77. Why does cutlery sometimes taste metallic?

• Ions transfer to taste buds
• Tongue static electricity
• Food pH changes
• Enamel wear

78. Popcorn pops because:

• Steam pressure builds in kernel
• Starch crystallizes
• Outer shell cracks
• Oil penetrates

79. Dew forms when:

• Humidity condenses on cool surfaces
• Rain evaporates
• Plants secrete water
• Fog settles

80. Why is the sky blue?

• Air scatters blue light most
• Water reflection
• Ozone layer color
• Sun’s composition

81. Thunder follows lightning because:

• Sound travels slower than light
• Air needs time to heat
• Light refracts first
• Storms rotate

82. Who invented the telephone?

• Alexander Graham Bell
• Thomas Edison
• Nikola Tesla
• Guglielmo Marconi

83. The discovery of penicillin is credited to:

• Alexander Fleming
• Louis Pasteur
• Marie Curie
• Robert Koch

84. The light bulb was perfected by:

• Thomas Edison
• Benjamin Franklin
• Michael Faraday
• James Watt

85. Who discovered gravity’s laws by observing a falling apple?

• Isaac Newton
• Galileo Galilei
• Albert Einstein
• Stephen Hawking

86. The first successful polio vaccine was developed by:

• Jonas Salk
• Louis Pasteur
• Edward Jenner
• Robert Koch

87. X-rays were discovered by:

• Wilhelm Röntgen
• Marie Curie
• Niels Bohr
• Ernest Rutherford

88. The structure of DNA was discovered by:

• Watson & Crick
• Darwin & Wallace
• Einstein & Bohr
• Pasteur & Koch

89. The first person to step on the Moon was:

• Neil Armstrong
• Buzz Aldrin
• Yuri Gagarin
• John Glenn

90. Paracetamol is primarily used as:

• Pain reliever and fever reducer
• Antibiotic
• Antacid
• Antihistamine

91. Ibuprofen belongs to which drug class?

• NSAIDs (Non-steroidal anti-inflammatory drugs)
• Antibiotics
• Antivirals
• Antidepressants

92. Oral rehydration salts (ORS) are used to treat:

• Dehydration
• High blood pressure
• Diabetes
• Skin infections

93. The dangerous interaction between alcohol and paracetamol can cause:

• Liver damage
• Kidney stones
• High blood pressure
• Diabetes

94. Sublingual medicines are administered:

• Under the tongue
• Through injection
• On the skin
• Through inhalation

95. The liquid part of blood is called:

• Plasma
• Platelets
• Hemoglobin
• Lymph

96. Which blood type is the universal donor?

• O-negative
• A-positive
• AB-positive
• B-negative

97. The function of white blood cells is to:

• Fight infections
• Carry oxygen
• Clot blood
• Digest food

98. Gas exchange occurs in tiny air sacs called:

• Alveoli
• Bronchi
• Trachea
• Diaphragm

99. The dome-shaped muscle that aids breathing is:

• Diaphragm
• Biceps
• Quadriceps
• Pectoralis

100. Food is chemically broken down in the:

• Small intestine
• Mouth
• Stomach
• Large intestine