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MCQs -for Competitive Exams & Improve Knowledge

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What is the term used for the flow of electric charge?

  • (A) Voltage
  • (B) Current
  • (C) Resistance
  • (D) Power

Answer: Current

Electric current is the flow of electric charge, typically carried by electrons through a conductor.

What is the main source of energy for the Sun?

  • (A) Nuclear fusion
  • (B) Chemical reaction
  • (C) Solar radiation
  • (D) Gravitational force

Answer: Nuclear fusion

The Sun?s energy comes from nuclear fusion, where hydrogen atoms fuse to form helium, releasing energy.

Which planet is known for its prominent ring system?

  • (A) Venus
  • (B) Saturn
  • (C) Jupiter
  • (D) Uranus

Answer: Saturn

Saturn is famous for its beautiful and extensive ring system, made up of ice, rock and dust particles.

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Which process involves the change of a liquid to a gas?

  • (A) Condensation
  • (B) Freezing
  • (C) Boiling
  • (D) Evaporation

Answer: Evaporation

Evaporation is the process where liquid changes into a gas, usually due to heat, as molecules gain enough energy to escape into the air.

Which part of the brain is responsible for coordination and balance?

  • (A) Cerebrum
  • (B) Cerebellum
  • (C) Medulla
  • (D) Hypothalamus

Answer: Cerebellum

The cerebellum is responsible for coordinating movement and maintaining balance and posture.

What is the chemical symbol for the element oxygen?

  • (A) O
  • (B) O2
  • (C) Ox
  • (D) Oy

Answer: O

Oxygen is represented by the chemical symbol O and is essential for respiration in living organisms.

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What is the primary function of the kidneys in the human body?

  • (A) Produce hormones
  • (B) Detoxify blood
  • (C) Pump blood
  • (D) Absorb nutrients

Answer: Detoxify blood

The kidneys filter blood, remove waste and help regulate fluid balance, electrolytes and blood pressure.

Which of the following elements is a halogen?

  • (A) Oxygen
  • (B) Fluorine
  • (C) Nitrogen
  • (D) Carbon

Answer: Fluorine

Fluorine is a halogen, a group of reactive elements in Group 17 of the periodic table.

What is the unit of electrical resistance?

  • (A) Ampere
  • (B) Watt
  • (C) Ohm
  • (D) Volt

Answer: Ohm

The unit of electrical resistance is the Ohm (?), which measures the opposition to the flow of electric current.

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Which of the following elements is essential for photosynthesis?

  • (A) Calcium
  • (B) Iodine
  • (C) Iron
  • (D) Magnesium

Answer: Magnesium

Magnesium is the central atom in the chlorophyll molecule, which is essential for photosynthesis in plants.

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