Explanation

• Laser light has unique physical properties.
• It is different from ordinary light.
• It travels in a very narrow and focused beam.
• Its waves move in perfect synchronization.
• These properties are called coherence and directionality.

Last verified on 04-05-2026

Explanation

• The Control Unit (CU) is a part of the CPU that manages and directs all computer operations.
• It fetches instructions from memory, decodes them, and coordinates execution by other units.
• Ensures smooth operation of arithmetic, logic, and input/output processes.

Last verified on 09-02-2026

Explanation

• Atoms of the same element always have the same atomic number.
• Sometimes, they differ in mass due to neutrons.
• Such atoms have identical chemical behavior.
• They differ only in mass number, not in properties.
• These are called isotopes.

Additional information:

• Radioactive isotopes are used in medicine and industry.
• Carbon-14 is used for age determination (carbon dating).

Last verified on 04-05-2026

Explanation

• Radioactive radiations include alpha, beta, and gamma rays.
• They differ in mass, charge, and penetrating power.
• Alpha rays are the least penetrating among them.
• They can be stopped easily by very thin materials.
• Even a sheet of paper can block alpha radiation completely.

Last verified on 04-05-2026

Explanation

• Atomic number is a fundamental property of an element.
• It defines the identity of an element in the periodic table.
• It is based on particles present in the nucleus.
• Specifically, it depends on the number of protons.
• Each element has a unique atomic number.

Last verified on 04-05-2026

Explanation

• Energy sources are divided into conventional and non-conventional.
• Conventional sources are reliable and used on a large scale.
• They provide continuous energy supply.
• Non-conventional sources depend on natural conditions like sun or wind.
• Natural gas is a conventional and widely used energy source.

Last verified on 04-05-2026