Natural Science MCQs (1–50) – Page 1
Physics + Chemistry + Biology + Environment
- What is the SI unit of force?
a) Joule
b) Newton
c) Watt
d) Pascal
Answer: b - Speed is defined as:
a) Distance × Time
b) Distance / Time
c) Time / Distance
d) None
Answer: b - Which law states F = ma?
a) Newton’s 1st Law
b) Newton’s 2nd Law
c) Newton’s 3rd Law
d) Law of gravity
Answer: b - Unit of energy is:
a) Watt
b) Joule
c) Newton
d) Volt
Answer: b - Sound travels fastest in:
a) Air
b) Water
c) Steel
d) Vacuum
Answer: c - pH value of neutral solution:
a) 0
b) 7
c) 14
d) 10
Answer: b - Which is an acid?
a) NaOH
b) HCl
c) KOH
d) CaO
Answer: b - Atomic number represents:
a) Neutrons
b) Protons
c) Electrons only
d) Mass
Answer: b - Water formula:
a) CO2
b) H2O
c) O2
d) H2
Answer: b - Periodic table arranged by:
a) Mass
b) Atomic number
c) Size
d) Density
Answer: b - Smallest unit of life:
a) Tissue
b) Cell
c) Organ
d) Atom
Answer: b - Photosynthesis occurs in:
a) Root
b) Stem
c) Leaf
d) Flower
Answer: c - Human heart chambers:
a) 2
b) 3
c) 4
d) 5
Answer: c - Blood is pumped by:
a) Brain
b) Heart
c) Lungs
d) Kidney
Answer: b - Largest organ in human body:
a) Liver
b) Skin
c) Brain
d) Heart
Answer: b - Ozone layer protects from:
a) Heat
b) UV rays
c) Rain
d) Wind
Answer: b - Greenhouse gas:
a) Oxygen
b) Nitrogen
c) CO2
d) Hydrogen
Answer: c - Pollution caused by vehicles:
a) Water
b) Air
c) Soil
d) Noise
Answer: b - Energy stored in food:
a) Chemical energy
b) Heat energy
c) Light energy
d) Sound
Answer: a - Electric current unit:
a) Volt
b) Ampere
c) Watt
d) Ohm
Answer: b - Resistance unit:
a) Ohm
b) Volt
c) Ampere
d) Joule
Answer: a - Magnet attracts:
a) Wood
b) Iron
c) Plastic
d) Paper
Answer: b - Boiling point of water:
a) 50°C
b) 100°C
c) 150°C
d) 0°C
Answer: b - Freezing point of water:
a) 0°C
b) 10°C
c) 50°C
d) 100°C
Answer: a - Gas used in respiration:
a) CO2
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b - Plant releases:
a) CO2
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b - DNA stands for:
a) Deoxyribo Nucleic Acid
b) Dynamic Acid
c) Double Acid
d) None
Answer: a - Vitamin C source:
a) Rice
b) Orange
c) Milk
d) Meat
Answer: b - Deficiency of iron causes:
a) Fever
b) Anemia
c) Cold
d) Diabetes
Answer: b - Kidney function:
a) Digestion
b) Filtration
c) Breathing
d) Thinking
Answer: b - Sun is a:
a) Planet
b) Star
c) Satellite
d) Galaxy
Answer: b - Earth revolves around:
a) Moon
b) Sun
c) Mars
d) Jupiter
Answer: b - Moon is:
a) Star
b) Planet
c) Satellite
d) Galaxy
Answer: c - Force of attraction between masses:
a) Friction
b) Gravity
c) Pressure
d) Energy
Answer: b - Work formula:
a) Force × Distance
b) Distance / Time
c) Mass × Velocity
d) Power × Time
Answer: a - Power unit:
a) Joule
b) Watt
c) Newton
d) Volt
Answer: b - Acid turns litmus:
a) Blue to Red
b) Red to Blue
c) Green
d) Yellow
Answer: a - Base turns litmus:
a) Red to Blue
b) Blue to Red
c) No change
d) Yellow
Answer: a - Human skeleton bones:
a) 106
b) 206
c) 306
d) 406
Answer: b - Largest gland:
a) Heart
b) Liver
c) Brain
d) Kidney
Answer: b - Photosynthesis needs:
a) Oxygen
b) Sunlight
c) Nitrogen
d) Hydrogen
Answer: b - Pollution of water affects:
a) Soil
b) Aquatic life
c) Air
d) Plants only
Answer: b - Noise pollution causes:
a) Hearing loss
b) Fever
c) Cold
d) Diabetes
Answer: a - Energy cannot be:
a) Created
b) Destroyed
c) Both
d) None
Answer: c - SI unit of temperature:
a) Celsius
b) Kelvin
c) Fahrenheit
d) Joule
Answer: b - Which gas causes global warming?
a) O2
b) CO2
c) N2
d) H2
Answer: b - Human brain controls:
a) Digestion
b) Thinking
c) Breathing only
d) Blood only
Answer: b - Cell discovered by:
a) Newton
b) Hooke
c) Einstein
d) Darwin
Answer: b - Evolution theory by:
a) Newton
b) Darwin
c) Einstein
d) Hooke
Answer: b
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