100 important science multiple-choice questions (MCQs) along with their answers, suitable for job tests in Pakistan:
Science MCQs with Answers
- What is the chemical symbol for water?
- a) H2O
- b) O2
- c) CO2
- d) NaCl
Answer: a) H2O
- Which planet is known as the Red Planet?
- a) Earth
- b) Mars
- c) Jupiter
- d) Venus
Answer: b) Mars
- What is the powerhouse of the cell?
- a) Nucleus
- b) Ribosome
- c) Mitochondria
- d) Endoplasmic reticulum
Answer: c) Mitochondria
- Which gas is most abundant in the Earth’s atmosphere?
- a) Oxygen
- b) Nitrogen
- c) Carbon Dioxide
- d) Hydrogen
Answer: b) Nitrogen
- What is the process of converting solid into gas called?
- a) Melting
- b) Sublimation
- c) Evaporation
- d) Condensation
Answer: b) Sublimation
- What is the boiling point of water at sea level?
- a) 90°C
- b) 100°C
- c) 120°C
- d) 80°C
Answer: b) 100°C
- Which organ is responsible for pumping blood in the human body?
- a) Brain
- b) Liver
- c) Heart
- d) Lungs
Answer: c) Heart
- What is the main gas released by plants during photosynthesis?
- a) Oxygen
- b) Carbon Dioxide
- c) Nitrogen
- d) Hydrogen
Answer: a) Oxygen
- Which part of the human eye controls the amount of light entering?
- a) Retina
- b) Cornea
- c) Iris
- d) Lens
Answer: c) Iris
- What is the chemical formula for table salt?
- a) NaCl
- b) KCl
- c) CaCl2
- d) MgCl2
Answer: a) NaCl
- What type of bond is formed when electrons are shared between atoms?
- a) Ionic bond
- b) Covalent bond
- c) Metallic bond
- d) Hydrogen bond
Answer: b) Covalent bond
- Which is the largest organ in the human body?
- a) Heart
- b) Liver
- c) Skin
- d) Brain
Answer: c) Skin
- What is the SI unit of force?
- a) Joule
- b) Newton
- c) Pascal
- d) Watt
Answer: b) Newton
- What is the process of water cycle called?
- a) Evaporation
- b) Precipitation
- c) Condensation
- d) All of the above
Answer: d) All of the above
- Which element has the highest melting point?
- a) Gold
- b) Iron
- c) Tungsten
- d) Silver
Answer: c) Tungsten
- What is the chemical symbol for gold?
- a) Au
- b) Ag
- c) Pb
- d) Fe
Answer: a) Au
- Which of the following is a non-renewable resource?
- a) Solar energy
- b) Wind energy
- c) Natural gas
- d) Biomass
Answer: c) Natural gas
- What is the main function of red blood cells?
- a) Fight infection
- b) Carry oxygen
- c) Clot blood
- d) Produce hormones
Answer: b) Carry oxygen
- Which type of electromagnetic radiation has the longest wavelength?
- a) Gamma rays
- b) X-rays
- c) Ultraviolet
- d) Radio waves
Answer: d) Radio waves
- What is the main component of the Earth’s core?
- a) Iron
- b) Nickel
- c) Silicon
- d) Oxygen
Answer: a) Iron
- Which of the following is a renewable resource?
- a) Coal
- b) Oil
- c) Wind
- d) Natural gas
Answer: c) Wind
- What type of rock is formed by the cooling and solidification of magma?
- a) Sedimentary
- b) Metamorphic
- c) Igneous
- d) Fossil
Answer: c) Igneous
- What is the main function of the digestive system?
- a) Pump blood
- b) Produce hormones
- c) Break down food
- d) Filter waste
Answer: c) Break down food
- Which organelle is known as the “control center” of the cell?
- a) Mitochondria
- b) Ribosome
- c) Nucleus
- d) Golgi apparatus
Answer: c) Nucleus
- What is the hardest natural substance on Earth?
- a) Gold
- b) Diamond
- c) Iron
- d) Quartz
Answer: b) Diamond
- What is the term for animals that eat both plants and animals?
- a) Herbivores
- b) Carnivores
- c) Omnivores
- d) Detritivores
Answer: c) Omnivores
- Which planet is known for its rings?
- a) Mars
- b) Jupiter
- c) Saturn
- d) Neptune
Answer: c) Saturn
- What is the chemical formula for glucose?
- a) C6H12O6
- b) C12H22O11
- c) C6H6
- d) C2H5OH
Answer: a) C6H12O6
- Which gas is produced during cellular respiration?
- a) Oxygen
- b) Carbon dioxide
- c) Nitrogen
- d) Hydrogen
Answer: b) Carbon dioxide
- What is the primary function of the kidneys?
- a) Produce hormones
- b) Filter blood and produce urine
- c) Regulate temperature
- d) Digest food
Answer: b) Filter blood and produce urine
- What type of lens is used to correct nearsightedness?
- a) Convex lens
- b) Concave lens
- c) Cylindrical lens
- d) Bifocal lens
Answer: b) Concave lens
- Which scientist is known for the theory of evolution?
- a) Isaac Newton
- b) Albert Einstein
- c) Charles Darwin
- d) Galileo Galilei
Answer: c) Charles Darwin
- What is the main source of energy for the Earth?
- a) The Moon
- b) The Sun
- c) Geothermal
- d) Fossil fuels
Answer: b) The Sun
- What is the process of water vapor changing into liquid water?
- a) Evaporation
- b) Condensation
- c) Sublimation
- d) Precipitation
Answer: b) Condensation
- Which vitamin is produced when skin is exposed to sunlight?
- a) Vitamin A
- b) Vitamin B
- c) Vitamin C
- d) Vitamin D
Answer: d) Vitamin D
- What is the primary component of the Earth’s atmosphere?
- a) Oxygen
- b) Carbon Dioxide
- c) Nitrogen
- d) Argon
Answer: c) Nitrogen
- Which blood type is considered the universal donor?
- a) A
- b) B
- c) AB
- d) O
Answer: d) O
- What is the chemical reaction that occurs when acids and bases react called?
- a) Neutralization
- b) Oxidation
- c) Hydrolysis
- d) Reduction
Answer: a) Neutralization
- Which of the following is not a fundamental force of nature?
- a) Gravity
- b) Electromagnetism
- c) Friction
- d) Nuclear
Answer: c) Friction
- What is the main function of the respiratory system?
- a) Pump blood
- b) Exchange gases
- c) Digest food
- d) Produce hormones
Answer: b) Exchange gases
- Which process do plants use to make their food?
- a) Respiration
- b) Photosynthesis
- c) Fermentation
- d) Transpiration
Answer: b) Photosynthesis
- What is the smallest unit of life?
- a) Tissue
- b) Organ
- c) Cell
- d) Organism
Answer: c) Cell
- What is the main gas released during combustion?
- a) Oxygen
- b) Nitrogen
- c) Carbon Dioxide
- d) Hydrogen
Answer: c) Carbon Dioxide
- Which structure in a plant cell is responsible for photosynthesis?
- a) Mitochondria
- b) Chloroplast
- c) Nucleus
- d) Ribosome
Answer: b) Chloroplast
- What is the primary function of DNA?
- a) Energy production
- b) Protein synthesis
- c) Genetic information storage
- d) Cell division
Answer: c) Genetic information storage
- Which type of rock is formed from the accumulation of sediments?
- a) Igneous
- b) Metamorphic
- c) Sedimentary
- d) Fossil
Answer: c) Sedimentary
- What is the main function of white blood cells?
- a) Carry oxygen
- b) Fight infections
- c) Clot blood
- d) Produce energy
Answer: b) Fight infections
- What is the unit of measurement for energy?
- a) Joule
- b) Watt
- c) Volt
- d) Ampere
Answer: a) Joule
- Which scientist proposed the three laws of motion?
- a) Albert Einstein
- b) Isaac Newton
- c) Galileo Galilei
- d) Niels Bohr
Answer: b) Isaac Newton
- What is the primary function of the skeletal system?
- a) Produce energy
- b) Protect internal organs
- c) Circulate blood
- d) Regulate temperature
Answer: b) Protect internal organs
- Which type of bond is formed by the transfer of electrons?
- a) Ionic bond
- b) Covalent bond
- c) Metallic bond
- d) Hydrogen bond
Answer: a) Ionic bond
- What is the primary source of energy for photosynthesis?
- a) Water
- b) Carbon Dioxide
- c) Sunlight
- d) Soil
Answer: c) Sunlight
- Which of the following is a feature of mammals?
- a) Laying eggs
- b) Cold-blooded
- c) Hair or fur
- d) Gills
Answer: c) Hair or fur
- What is the function of the pancreas?
- a) Produce bile
- b) Produce insulin
- c) Filter blood
- d) Absorb nutrients
Answer: b) Produce insulin
- Which type of wave does sound travel as?
- a) Electromagnetic
- b) Longitudinal
- c) Transverse
- d) Surface
Answer: b) Longitudinal
- What is the main function of the immune system?
- a) Digest food
- b) Produce hormones
- c) Protect against disease
- d) Circulate blood
Answer: c) Protect against disease
- What is the primary gas that plants absorb during photosynthesis?
- a) Oxygen
- b) Carbon Dioxide
- c) Nitrogen
- d) Hydrogen
Answer: b) Carbon Dioxide
- What is the term for a solution with a pH less than 7?
- a) Neutral
- b) Basic
- c) Acidic
- d) Alkaline
Answer: c) Acidic
- Which structure controls the passage of substances in and out of the cell?
- a) Cell wall
- b) Cell membrane
- c) Cytoplasm
- d) Nucleus
Answer: b) Cell membrane
- What type of energy is stored in food?
- a) Kinetic energy
- b) Thermal energy
- c) Chemical energy
- d) Mechanical energy
Answer: c) Chemical energy
- What is the chemical symbol for sodium?
- a) S
- b) Na
- c) K
- d) Cl
Answer: b) Na
- Which of the following is a mammal?
- a) Shark
- b) Frog
- c) Eagle
- d) Whale
Answer: d) Whale
- What is the main function of chlorophyll in plants?
- a) Absorb water
- b) Absorb sunlight
- c) Produce oxygen
- d) Store nutrients
Answer: b) Absorb sunlight
- What is the process of changing a liquid into a gas called?
- a) Condensation
- b) Freezing
- c) Evaporation
- d) Melting
Answer: c) Evaporation
- Which part of the human body is primarily responsible for balance?
- a) Eyes
- b) Ears
- c) Brain
- d) Legs
Answer: b) Ears
- Which of the following diseases is caused by a virus?
- a) Tuberculosis
- b) Diabetes
- c) Influenza
- d) Malaria
Answer: c) Influenza
- What is the term for a group of similar cells that perform a specific function?
- a) Tissue
- b) Organ
- c) Organism
- d) System
Answer: a) Tissue
- Which type of electromagnetic radiation is used in medical imaging?
- a) Infrared
- b) X-rays
- c) Ultraviolet
- d) Radio waves
Answer: b) X-rays
- What is the primary function of the circulatory system?
- a) Exchange gases
- b) Deliver nutrients and oxygen
- c) Produce hormones
- d) Filter waste
Answer: b) Deliver nutrients and oxygen
- Which of the following is an example of a chemical change?
- a) Melting ice
- b) Boiling water
- c) Rusting iron
- d) Dissolving sugar
Answer: c) Rusting iron
- What is the process by which plants lose water called?
- a) Absorption
- b) Transpiration
- c) Evaporation
- d) Condensation
Answer: b) Transpiration
- What is the largest planet in our solar system?
- a) Earth
- b) Mars
- c) Jupiter
- d) Saturn
Answer: c) Jupiter
- What is the primary component of the cell wall in plants?
- a) Lipids
- b) Proteins
- c) Cellulose
- d) Nucleic acids
Answer: c) Cellulose
- Which of the following is a noble gas?
- a) Oxygen
- b) Helium
- c) Nitrogen
- d) Hydrogen
Answer: b) Helium
- What is the function of enzymes in biological processes?
- a) Store energy
- b) Speed up reactions
- c) Provide structure
- d) Transport substances
Answer: b) Speed up reactions
- What is the scientific study of fungi called?
- a) Botany
- b) Mycology
- c) Zoology
- d) Microbiology
Answer: b) Mycology
- Which organ in the human body produces bile?
- a) Stomach
- b) Pancreas
- c) Liver
- d) Gallbladder
Answer: c) Liver
- What is the chemical formula for carbon dioxide?
- a) CO
- b) CO2
- c) C2O
- d) C2O2
Answer: b) CO2
- Which of the following is a property of metals?
- a) Brittle
- b) Malleable
- c) Insulators
- d) Non-lustrous
Answer: b) Malleable
- What is the main component of natural gas?
- a) Ethanol
- b) Methane
- c) Propane
- d) Butane
Answer: b) Methane
- What is the basic unit of life?
- a) Molecule
- b) Cell
- c) Tissue
- d) Organ
Answer: b) Cell
- What is the primary purpose of DNA replication?
- a) Protein synthesis
- b) Energy production
- c) Cell division
- d) Genetic information transmission
Answer: d) Genetic information transmission
- Which of the following is a type of simple machine?
- a) Lever
- b) Engine
- c) Generator
- d) Battery
Answer: a) Lever
- What is the main function of the liver?
- a) Produce insulin
- b) Detoxify substances
- c) Pump blood
- d) Absorb nutrients
Answer: b) Detoxify substances
- What is the primary energy source for the Earth?
- a) Fossil fuels
- b) Nuclear energy
- c) Solar energy
- d) Wind energy
Answer: c) Solar energy
- Which of the following best describes an acid?
- a) Bitter taste, slippery feel
- b) Sour taste, pH less than 7
- c) Sweet taste, pH greater than 7
- d) Colorless liquid
Answer: b) Sour taste, pH less than 7
- What is the primary function of the integumentary system?
- a) Protect the body
- b) Produce hormones
- c) Regulate temperature
- d) Aid in digestion
Answer: a) Protect the body
- What is the function of the Golgi apparatus in a cell?
- a) Produce energy
- b) Synthesize proteins
- c) Modify and package proteins
- d) Store waste
Answer: c) Modify and package proteins
- Which of the following is not a type of blood cell?
- a) Red blood cell
- b) White blood cell
- c) Platelet
- d) Neuron
Answer: d) Neuron
- What is the name of the process by which plants take in carbon dioxide?
- a) Respiration
- b) Transpiration
- c) Photosynthesis
- d) Absorption
Answer: c) Photosynthesis
- Which of the following substances is an alkali?
- a) Vinegar
- b) Soap
- c) Lemon juice
- d) Battery acid
Answer: b) Soap
- Which of the following is a property of water?
- a) Low specific heat
- b) Cohesion
- c) Non-polar
- d) Soluble in oil
Answer: b) Cohesion
- What is the main source of energy for the human body?
- a) Proteins
- b) Carbohydrates
- c) Fats
- d) Vitamins
Answer: b) Carbohydrates
- What is the term for the evolutionary change in a species over time?
- a) Adaptation
- b) Mutation
- c) Speciation
- d) Evolution
Answer: d) Evolution
- What is the pH of pure water?
- a) 5
- b) 7
- c) 9
- d) 10
Answer: b) 7
- Which part of the brain is responsible for coordination and balance?
- a) Cerebrum
- b) Cerebellum
- c) Brainstem
- d) Thalamus
Answer: b) Cerebellum
- What is the main function of the lymphatic system?
- a) Transport oxygen
- b) Filter waste
- c) Protect against disease
- d) Produce hormones
Answer: c) Protect against disease
- Which of the following is a symptom of dehydration?
- a) Increased urination
- b) Dry skin
- c) Improved concentration
- d) Increased energy
Answer: b) Dry skin
- What is the main function of the reproductive system?
- a) Produce offspring
- b) Regulate temperature
- c) Filter waste
- d) Pump blood
Answer: a) Produce offspring
- Which of the following elements is essential for human life? – a) Neon – b) Iron – c) Xenon – d) Argon
Answer: b) Iron
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