Explanation

John McCarthy is recognized as the father of Artificial Intelligence due to his astounding contribution in the field of Computer Science.

John McCarthy was an American computer scientist

Note: Artificial Intelligence is a branch of Computer science, which aims to create intelligent machines so that machine can think intelligently in the same manner as a human does.

Explanation

• Silver reflects approximately 95% of visible light.
• It is one of the best natural reflectors of visible light.
• Because of its high reflectivity.
• Silver is widely used in mirrors and optical instruments.
• It produces bright and clear reflections.

Last verified on 07-06-2026

Explanation

• Interference occurs when two waves overlap or cross each other.
• The waves may produce a stronger wave (constructive interference) or a weaker wave (destructive interference).
• It is a fundamental property of all types of waves, such as light, sound, and water waves.

Last verified on 07-07-2026

Explanation

Explanation

• Glass is an amorphous solid.
• It has no regular crystal structure, so its particles are arranged randomly.
• It softens gradually when heated.
• Glass is widely used in windows, bottles, lenses, and laboratory equipment.

Last verified on 07-07-2026

Explanation

• Alpha particles are compact clusters of two protons and two neutrons.
• They are identical to the nucleus of a helium-4 atom.
• Alpha particles carry a +2 positive charge.
• They have high ionizing power but low penetrating power.
• A sheet of paper or human skin can stop alpha particles.

Last verified on 07-06-2025

Explanation

• A Fathometer is used to measure the depth of the ocean, sea, or any body of water.
• It determines the distance from the water surface to the seabed.
• The instrument works using sound waves (echo sounding).
• It measures the time taken for sound waves to travel to the seabed and return.

Additional information:

• Galvanometer → Measures electric current
• Barometer → Measures atmospheric pressure
• Thermometer → Measures temperature
• Hygrometer → Measures humidity

Last verified on 06-07-2026

Explanation

• Albert Einstein explained the Photoelectric Effect in 1905 by proposing that light consists of tiny particles called photons.
• He showed that electrons are emitted from a metal surface when light of sufficient frequency falls on it.
• His explanation supported Quantum Theory.
• Einstein received the Nobel Prize in Physics in 1921 for this discovery.

Last verified on 06-07-2026

Explanation

• Gravitational force is the fundamental force that attracts any two objects with mass toward each other.
• It was explained by Isaac Newton through the Law of Universal Gravitation.
• Gravity keeps planets in orbit around the Sun and causes objects to fall toward the Earth.

Last verified on 06-07-2026

Explanation

• Freezing Point: 0°C
• Fahrenheit: 32°F
• Kelvin: 273.15 K

Additional information:

• Boiling Point: 100°C (212°F or 373.15 K)
• Standard Atmospheric Pressure: 1 atm (760 mmHg)

Last verified on 06-07-2026