Explanation

Substances that do not normally sublime

• - Glucose: Decomposes on heating.
• - Sodium chloride: Does not sublime under ordinary laboratory conditions.

Additional information:

• Iodine: Sublimes on heating.
• Camphor: Sublimes easily.

 Last updated on 12 NOV 2026

Explanation

• Remote Sensing is the science of collecting information about the Earth’s surface without direct contact.
• It is mainly done using satellites equipped with special sensors and cameras in space.
• These satellites capture images and data used for mapping, weather forecasting, and environmental monitoring.

Last verified on 12-03-2026

Explanation

• GPS (Global Positioning System) is used for identifying the location of objects on Earth.
• GPS provides accurate positioning and timing information, enabling users to determine their precise location anywhere on Earth.
• It is a network of satellites orbiting the Earth.
• It provide location information and timing signals to GPS receivers on the ground.

Last verified on 12-11-2026

Explanation

• Continetal Drift theory was proposed by Alfred wegner in 1912.
• It stated that continents have changed their position and initially there was only one big continent named Pangea.
• Although he was unable to explain the force behind the drifting of continents.

Last verified on 12-11-2026

Explanation

• Stars produce energy mainly through nuclear fusion in their cores.
• Hydrogen nuclei combine to form helium and release energy.
• The Sun also generates its energy through nuclear fusion.

Last verified on 11-11-2026