Explanation

• Total standard zones: 24
• Earth rotation time: 24 hours
• Longitude per zone: 15 degrees
• Starting point: Greenwich (0°)
• It is used worldwide for time coordination.

Last verified on 14-06-2026

Explanation

• Light Year is the distance that light can travel in one year.
• The distance light travels in one year is known as light year.
• 1 light year is equal to 9.5 x 10¹²km.

Last verified on 30-03-2026

Explanation

• When a body moves upward, its height from the ground increases.
• Gravitational potential energy depends on height (P.E = mgh), so it increases as height increases.
• The increase in potential energy comes from the conversion of kinetic energy into potential energy.

Last verified on 18-06-2026

Explanation

• Picosecond (ps) = 10⁻¹² seconds
• SI prefix “pico” means 10⁻¹².
• 1 picosecond = one trillionth of a second.

Additional information:

• Microsecond (μs) = 10⁻⁶ seconds
• Nanosecond (ns) = 10⁻⁹ seconds
• Millisecond (ms) = 10⁻³ seconds
• Femtosecond (fs) = 10⁻¹⁵ seconds
• Attosecond (as) = 10⁻¹⁸ seconds
• Zeptosecond (zs) = 10⁻²¹ seconds
• Yoctosecond (ys) = 10⁻²⁴ seconds

Last verified on 17-06-2026

Explanation

• The dimension of viscosity is [ML⁻¹T⁻¹].
• Viscosity measures a fluid’s resistance to flow.
• Higher viscosity means thicker fluid (like honey).
• Lower viscosity means thinner fluid (like water).

Last verified on 17-06-2026