Assertion and Reason MCQ Questions & Answers [PDF Download]

Assertion (A): Mitochondria are called the powerhouse of the cell.
Reason (R): Mitochondria synthesize ATP through cellular respiration and provide energy for cellular activities.

Assertion (A): The speed of light in vacuum is constant for all observers.
Reason (R): Light is an electromagnetic wave that travels through the luminiferous ether.

Assertion (A): Carbon dioxide concentration in atmosphere has increased significantly since the Industrial Revolution.
Reason (R): Burning of fossil fuels releases carbon dioxide which was previously stored underground.

Assertion (A): The sum of angles in any triangle is always 180°.
Reason (R): This property holds true only in Euclidean geometry.

Assertion (A): Ozone layer depletion leads to increased UV radiation reaching Earth's surface.
Reason (R): Chlorofluorocarbons (CFCs) break down ozone molecules in the stratosphere.

Assertion (A): The Indian Constitution is the longest written constitution in the world.
Reason (R): It was drafted by the Constituent Assembly over a period of three years.

Assertion (A): Enzymes increase the rate of biochemical reactions.
Reason (R): Enzymes provide additional energy to the reactants.

Assertion (A): Water has maximum density at 4°C.
Reason (R): At 4°C, hydrogen bonding in water is most efficient.

Assertion (A): Magnetic field lines never intersect each other.
Reason (R): At any point in space, magnetic field has a unique direction.

Assertion (A): The Quit India Movement was launched in 1942.
Reason (R): The failure of Cripps Mission led to this movement.

Assertion (A): Noble gases are chemically inert.
Reason (R): They have completely filled valence electron shells.

Assertion (A): Photosynthesis occurs only in green plants.
Reason (R): Chlorophyll is essential for photosynthesis.

Assertion (A): All metals conduct electricity.
Reason (R): Metals have free electrons in their structure.

Assertion (A): The value of acceleration due to gravity is same everywhere on Earth.
Reason (R): Gravitational force depends on the mass of Earth which is constant.

Assertion (A): DNA replication is semi-conservative.
Reason (R): Each new DNA molecule contains one original and one newly synthesized strand.

Assertion (A): Monsoons are seasonal winds that change direction.
Reason (R): Land and sea have different heating and cooling rates.

Assertion (A): Sound travels faster in solids than in gases.
Reason (R): Solids are denser than gases.

Assertion (A): All chemical reactions involve breaking and forming of bonds.
Reason (R): Energy is always absorbed when bonds are broken and released when bonds are formed.

Assertion (A): Arteries carry oxygenated blood and veins carry deoxygenated blood.
Reason (R): Arteries carry blood away from the heart while veins carry blood towards the heart.

Assertion (A): The Reserve Bank of India is the central bank of India.
Reason (R): It was established in 1935 under the British colonial administration.

Assertion (A): Desert plants have thick waxy leaves.
Reason (R): Waxy coating reduces water loss through transpiration.

Assertion (A): Light can exhibit both wave and particle properties.
Reason (R): This dual nature is explained by quantum mechanics.

Assertion (A): Economic growth always leads to economic development.
Reason (R): Growth increases per capita income which improves living standards.