Major Competitive Exams

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Q. What is the main reason for the appearance of a diffraction pattern when light passes through a narrow slit?
  • A. Interference of light waves
  • B. Refraction of light
  • C. Absorption of light
  • D. Reflection of light
Q. What is the main reason for the existence of geometric isomers?
  • A. Presence of double bonds
  • B. Presence of single bonds
  • C. Presence of chiral centers
  • D. Presence of functional groups
Q. What is the main reason for the occurrence of seasons on Earth?
  • A. Distance from the Sun
  • B. Tilt of the Earth's axis
  • C. Revolution around the Sun
  • D. Rotation of the Earth
Q. What is the main reason for the stability of aromatic compounds?
  • A. High molecular weight
  • B. Presence of double bonds
  • C. Resonance energy
  • D. Hydrogen bonding
Q. What is the main reason for the stability of atomic nuclei?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the main reason for the stability of benzene?
  • A. Presence of double bonds
  • B. Resonance
  • C. Hydrogen bonding
  • D. Ionic interactions
Q. What is the main reason for the stability of the electron in an atom? (2019)
  • A. Electrostatic attraction to the nucleus
  • B. High energy levels
  • C. Quantum tunneling
  • D. Magnetic forces
Q. What is the main reason for the stability of the electron orbits in an atom according to the Bohr model? (2019)
  • A. Electrons are stationary.
  • B. Electrons are attracted to the nucleus.
  • C. Electrons have quantized energy levels.
  • D. Electrons are repelled by each other.
Q. What is the main reason for the stability of the electron orbits in an atom?
  • A. Centripetal force
  • B. Electrostatic force
  • C. Quantum mechanics
  • D. All of the above
Q. What is the main reason for the stability of the nucleus in an atom?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the main reason for the stability of the nucleus?
  • A. Electromagnetic force
  • B. Gravitational force
  • C. Strong nuclear force
  • D. Weak nuclear force
Q. What is the main reason that gases fill their containers completely? (2023)
  • A. Particles are tightly packed
  • B. Particles are in fixed positions
  • C. Particles move freely and rapidly
  • D. Particles have high density
Q. What is the main reason that gases have low density compared to solids and liquids?
  • A. High temperature
  • B. Low pressure
  • C. Large particle separation
  • D. High kinetic energy
Q. What is the main reason that solids maintain their shape? (2023)
  • A. Particles are in constant motion
  • B. Particles are tightly packed and vibrate in place
  • C. Particles are loosely arranged
  • D. Particles have high kinetic energy
Q. What is the main reproductive structure of angiosperms? (2021)
  • A. Cone
  • B. Flower
  • C. Sporangium
  • D. Thallus
Q. What is the main role of antioxidants in nutrition?
  • A. Provide energy
  • B. Support immune function
  • C. Prevent oxidative stress
  • D. Aid digestion
Q. What is the main role of dietary fiber in human health? (2021)
  • A. Increase cholesterol
  • B. Aid digestion
  • C. Provide energy
  • D. Enhance taste
Q. What is the main site of nutrient absorption in the digestive system? (2020)
  • A. Mouth
  • B. Stomach
  • C. Small intestine
  • D. Large intestine
Q. What is the main site of protein digestion in the digestive system? (2021)
  • A. Mouth
  • B. Stomach
  • C. Small intestine
  • D. Large intestine
Q. What is the main site of protein digestion? (2021)
  • A. Mouth
  • B. Stomach
  • C. Small intestine
  • D. Large intestine
Q. What is the main source of alkanes?
  • A. Coal
  • B. Natural gas
  • C. Petroleum
  • D. Biomass
Q. What is the main source of freshwater on Earth? (2019)
  • A. Rivers
  • B. Lakes
  • C. Glaciers
  • D. Groundwater
Q. What is the main source of nitrogen oxides in the atmosphere?
  • A. Volcanic eruptions
  • B. Vehicle emissions
  • C. Industrial processes
  • D. Agricultural activities
Q. What is the main source of omega-3 fatty acids? (2021)
  • A. Fish oil
  • B. Butter
  • C. Coconut oil
  • D. Olive oil
Q. What is the main source of ozone depletion? (2021)
  • A. Carbon dioxide
  • B. Chlorofluorocarbons (CFCs)
  • C. Methane
  • D. Nitrous oxide
Q. What is the main source of ozone layer depletion? (2021)
  • A. Carbon dioxide
  • B. Chlorofluorocarbons (CFCs)
  • C. Methane
  • D. Nitrous oxide
Q. What is the main source of plastic pollution in oceans? (2021)
  • A. Industrial waste
  • B. Agricultural runoff
  • C. Single-use plastics
  • D. Sewage discharge
Q. What is the main source of sulfur dioxide in the atmosphere?
  • A. Volcanic eruptions
  • B. Automobile emissions
  • C. Industrial processes
  • D. All of the above
Q. What is the main storage form of carbohydrates in animals?
  • A. Starch
  • B. Glycogen
  • C. Cellulose
  • D. Chitin
Q. What is the main structural component of plant cell walls?
  • A. Starch
  • B. Glycogen
  • C. Cellulose
  • D. Chitin
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