Explanation

• A stretched spring possesses potential energy.
• When a spring is stretched or compressed, energy is stored in it.
• This stored energy is called elastic potential energy.
• It can be converted into kinetic energy when released.
• The more the stretch, the more energy is stored.

Last verified on 08-06-2026

Explanation

• Acceleration due to gravity is independent of the mass of the falling object.
• All objects fall with the same acceleration in vacuum.
• Gravity depends on Earth’s mass and radius, not object’s mass.
• It slightly varies with latitude due to Earth’s shape and rotation.
• Standard value: 9.8 m/s² near Earth’s surface.

Last verified on 08-06-2026

Explanation

• Oxygen is released from hemoglobin mainly in body tissues.
• Hemoglobin carries oxygen in the blood from lungs to body.
• In tissues, oxygen is needed for cellular respiration.
• Low oxygen concentration in tissues helps release oxygen.
• This process ensures energy production in cells.

Last verified on 08-06-2026

Explanation

• Law of conservation of momentum applies when no external force acts on a system.
• Momentum of a system remains constant in this condition.
• Only internal forces act between objects in the system.
• It is valid for collisions and explosions in isolated systems.
• Total momentum before and after event remains equal.

Last verified on 08-06-2026

Explanation

• Work done by gravity is zero when an object moves horizontally.
• Gravity acts vertically downward.
• Horizontal displacement is perpendicular to gravitational force.
• Work done depends on force × displacement × cos(θ).
• Here θ = 90°, so cos(90°) = 0.

Last verified on 08-06-2026

Explanation

• Thrombocytes (Platelets) help in blood clotting.
• They stop bleeding by forming a clot at the injury site.
• They stick together when a blood vessel is damaged.
• This prevents excess blood loss.
• They are essential for wound healing.

Last verified on 07-06-2026

Explanation

• Apple is rich in iron and dietary fiber.
• Iron helps in blood formation (RBC production).
• Fiber helps in digestion and stomach health.
• Apple also contains vitamins and antioxidants.
• It is a very healthy fruit for daily use.

Last verified on 07-06-2026

Explanation

• The chemical formula for water is H₂O.

Atomic masses:

• Hydrogen (H) = 1 amu each → 2 × 1 = 2 amu
• Oxygen (O) = 16 amu

Total molecular mass = 2 (from H) + 16 (from O) = 18 amu.

Last verified on 07-06-2026

Explanation

• Silica (SiO₂) is the main component of glass.
• It providing its transparency and hardness.
• It forms a network structure when melted, giving glass its solid yet brittle nature.

Last verified on 07-06-2026

Explanation

• Momentum (p = mv): If velocity doubles, momentum also doubles.
• Kinetic Energy (KE = ½mv²): If velocity doubles, KE becomes four times.

Last verified on 07-06-2026