Explanation

KE = 0.5mv² = 0.5 × 0.25 kg × (20 m/s)² = 0.5 × 0.25 × 400 = 50 J

Last verified on 16-03-2026

Explanation

The renewable energy sources are:

• Water energy
• Wind energy
• Tidal energy
• Solar energy
• Hydroelectric
• Ocean energy
• Geothermal energy
• Biomass
• Biogas

The non-renewable energy sources are:

• Fossil fuels or Hydrocarbon fuel (Oil, Natural gas, Coal)
• Nuclear energy

Last verified on 16-03-2026

Explanation

• Gear is a wheel with teeth along its edge that interlock with another gear to transmit motion and force.
• Gears are used to increase or decrease speed, change direction, or increase torque in machines.
• Common in clocks, bicycles, vehicles, and industrial machines.

Last verified on 16-03-2026

Explanation

• Osmosis is the movement of water molecules from a region of low solute concentration to a region of high solute concentration through a semi-permeable membrane.
• Blood purification techniques, like dialysis, use this principle to remove excess salts and waste from blood.
• Osmosis helps in maintaining fluid balance in cells and tissues.

Last verified on 16-03-2026

Explanation

• 1 meter = 3.2808 feet exactly.

Additional information:

• 1 kilometer = 3280.8 feet
• 1 centimeter = 0.032808 feet
• 1 inch = 0.083333 feet
• 1 mile = 5280 feet
• 1 yard = 3 feet

Last verified on 16-03-2026

Explanation

• Bases are substances that have a soapy or slippery feel when touched.
• This property occurs because bases react with oils on the skin, giving a soap-like texture.
• Many bases also turn red litmus paper blue in chemical tests.
• Common bases are used in cleaning agents, soaps, and detergents.

Last verified on 16-03-2026

Explanation

• Sonorousness is the property of metals that allows them to produce a ringing sound when struck.
• Because of this property, metals are used to make bells, gongs, and musical instruments.
• Metals like bronze and brass produce clear sounds when vibrated.
• This is why metallic materials are preferred in musical sound-producing objects.

Last verified on 16-03-2026

Explanation

• Copper is a chemical element with the symbol Cu and atomic number 29. 
• It is a soft, malleable, and ductile metal with a reddish-orange color.

The some major elements with their symbols:

• Hydrogen - H
• Sodium - Na
• Carbon - C
• Nitrogen - N
• Oxygen - O
• Fluorine - F
• Chlorine - Cl
• Potassium - K
• Helium - He
• Neon - Ne
• Calcium - Ca
• Sulphur - S
• Phosphorus - P
• Aluminium - Al
• Magnesium - Mg
• Iron - Fe

Last verified on 16-03-2026

Explanation

• A solid has both a definite shape and a definite volume.
• The particles in solids are tightly packed and only vibrate in fixed positions.
• Examples include iron, wood, stone, and ice.

Additional information:

• A liquid has a definite volume but no definite shape.
• A gas has neither definite shape nor definite volume.

Explanation

• Translocation is the process by which food made in the leaves moves to other parts of the plant through the phloem.
• In plants, food is produced in the leaves through photosynthesis.
• This prepared food must be transported to other parts like roots, stems, and fruits.

Last verified on 16-03-2026