Natural Science MCQs (101–150) – Page 3
Mixed Science – Concept Based Questions
- Which quantity has both magnitude and direction?
a) Speed
b) Distance
c) Velocity
d) Time
Answer: c - Acceleration is change in:
a) Speed
b) Velocity
c) Distance
d) Force
Answer: b - Which law explains action-reaction?
a) Newton’s 1st
b) Newton’s 2nd
c) Newton’s 3rd
d) Gravity
Answer: c - Momentum = ?
a) Mass × Velocity
b) Force × Time
c) Work × Time
d) Energy × Distance
Answer: a - Which device converts AC to DC?
a) Transformer
b) Rectifier
c) Generator
d) Motor
Answer: b - Which metal is best conductor?
a) Iron
b) Copper
c) Silver
d) Aluminium
Answer: c - Which gas is most abundant in air?
a) Oxygen
b) Nitrogen
c) CO2
d) Hydrogen
Answer: b - Which element is essential for respiration?
a) Hydrogen
b) Oxygen
c) Nitrogen
d) Carbon
Answer: b - Which acid is present in lemon?
a) Acetic acid
b) Citric acid
c) Sulfuric acid
d) Nitric acid
Answer: b - Which process releases energy in cells?
a) Photosynthesis
b) Respiration
c) Digestion
d) Transpiration
Answer: b - Which organ produces bile?
a) Stomach
b) Liver
c) Kidney
d) Heart
Answer: b - Which part of brain controls balance?
a) Cerebrum
b) Cerebellum
c) Medulla
d) Spinal cord
Answer: b - Which blood cells fight infection?
a) RBC
b) WBC
c) Platelets
d) Plasma
Answer: b - Which hormone regulates growth?
a) Insulin
b) Thyroxine
c) Growth hormone
d) Adrenaline
Answer: c - Which organ controls body activities?
a) Heart
b) Brain
c) Kidney
d) Liver
Answer: b - Which layer protects Earth from meteors?
a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere
Answer: c - Which gas forms ozone?
a) O2
b) O3
c) CO2
d) N2
Answer: b - Which is renewable resource?
a) Coal
b) Petroleum
c) Solar energy
d) Natural gas
Answer: c - Which causes soil erosion?
a) Trees
b) Floods
c) Grass
d) Roots
Answer: b - Which type of energy in stretched spring?
a) Kinetic
b) Potential
c) Heat
d) Chemical
Answer: b - Which law states energy conservation?
a) Newton’s Law
b) Law of Conservation of Energy
c) Boyle’s Law
d) Ohm’s Law
Answer: b - Which lens used in microscope?
a) Convex
b) Concave
c) Plane
d) None
Answer: a - Which vitamin helps clotting?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin K
Answer: d - Which organ stores urine?
a) Kidney
b) Bladder
c) Liver
d) Heart
Answer: b - Which part absorbs nutrients?
a) Stomach
b) Small intestine
c) Large intestine
d) Liver
Answer: b - Which disease due to lack of iodine?
a) Diabetes
b) Goitre
c) TB
d) Cancer
Answer: b - Which vitamin deficiency causes scurvy?
a) A
b) B
c) C
d) D
Answer: c - Which gas used in balloons?
a) Oxygen
b) Nitrogen
c) Helium
d) CO2
Answer: c - Which metal reacts with water?
a) Gold
b) Sodium
c) Silver
d) Copper
Answer: b - Which is amphoteric oxide?
a) CO2
b) ZnO
c) SO2
d) NO2
Answer: b - Which gas turns limewater milky?
a) O2
b) CO2
c) H2
d) N2
Answer: b - Which force acts towards center?
a) Friction
b) Centripetal
c) Magnetic
d) Electric
Answer: b - Which device measures electric current?
a) Voltmeter
b) Ammeter
c) Ohmmeter
d) Barometer
Answer: b - Which energy in moving object?
a) Potential
b) Kinetic
c) Heat
d) Light
Answer: b - Which is unit of voltage?
a) Ampere
b) Volt
c) Watt
d) Ohm
Answer: b - Which organ detoxifies body?
a) Kidney
b) Liver
c) Heart
d) Lung
Answer: b - Which structure carries genetic info?
a) Protein
b) DNA
c) RNA
d) Cell wall
Answer: b - Which scientist proposed relativity?
a) Newton
b) Einstein
c) Galileo
d) Faraday
Answer: b - Which vitamin helps vision?
a) A
b) B
c) C
d) D
Answer: a - Which organ helps breathing?
a) Heart
b) Lung
c) Kidney
d) Brain
Answer: b - Which is primary energy source?
a) Moon
b) Sun
c) Earth
d) Wind
Answer: b - Which process forms clouds?
a) Evaporation
b) Condensation
c) Precipitation
d) Sublimation
Answer: b - Which gas causes acid rain?
a) O2
b) CO2
c) SO2
d) H2
Answer: c - Which ecosystem has highest biodiversity?
a) Desert
b) Forest
c) Tundra
d) Ocean
Answer: b - Which is biodegradable?
a) Plastic
b) Glass
c) Paper
d) Metal
Answer: c - Which instrument measures humidity?
a) Thermometer
b) Barometer
c) Hygrometer
d) Anemometer
Answer: c - Which device converts mechanical to electrical?
a) Motor
b) Generator
c) Transformer
d) Battery
Answer: b - Which law relates V, I, R?
a) Ohm’s Law
b) Newton’s Law
c) Boyle’s Law
d) Hooke’s Law
Answer: a - Which scientist discovered gravity?
a) Einstein
b) Newton
c) Galileo
d) Darwin
Answer: b - Which is greenhouse effect result?
a) Cooling
b) Warming
c) Rain
d) Wind
Answer: b
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