Explanation

• The flash of light from lightning is a form of electromagnetic radiation, and as such, it travels at the speed of light.
• It is denoted by the letter c.

It is equal to:

• 3 x 10^8 meters per second (m/s) in scientific notation.
• 300,000 kilometers per second (km/s) in metric units.
• 186,282 miles per second (mi/s) in imperial units

Last verified on 19-03-2026

Explanation

• Comets: huge masses of snow and rocks that revolve around the Sun in orbits.
• Comets: have huge glowing tails.
• Halley's Comet was last seen in: 1986
• Halley's Comet will be next seen in: 2062

Last verified on 18-03-2026

Explanation

• Apollo 11 was the mission that successfully landed astronauts.
• Neil Armstrong and Buzz Aldrin on the moon on July 20, 1969.

Last verified on 15-03-2026

Explanation

• If an object absorbs all seven colors of light (i.e., all the wavelengths of visible light), it appears black.
• This is because no light is being reflected, and our eyes perceive the absence of light as black.
• When an object reflects all the component colors of light, it appears white.

Last verified on 18-03-2026

Explanation

• Security mirrors are typically convex mirrors.

The examples of concave mirrors:

• Cosmetic mirrors (makeup mirrors)
• Dentist mirrors
• Car headlight mirrors

Last verified on 18-03-2026

Explanation

• A kaleidoscope is an optical instrument that creates symmetrical, colorful multiple images using mirrors and colored objects.
• When rotated, it continuously forms new patterns of images.
• Commonly used for educational purposes and toys.

Last verified on 18-03-2026

Explanation

• Reflection occurs when light bounces back from a surface instead of passing through it.
• Shiny or smooth surfaces like mirrors produce clear and regular reflections.
• This principle is used in mirrors, periscopes, and optical instruments.

Last verified on 18-03-2026

Explanation

• Kinetic energy is the energy an object possesses due to its motion.
• Any moving object, such as a car, a ball, or a person, has kinetic energy.
• The amount of kinetic energy an object has depends on its mass and velocity.

Last verified on 18-03-2026

Explanation

• Stars produce energy by combining lighter nuclei into heavier nuclei in their cores.
• In the core of a star, hydrogen nuclei fuse to form helium.
• This process releases a huge amount of energy in the form of light and heat.
• It is the primary source of a star’s energy and sustains its radiation for billions of years.

Last verified on 17-03-2026

Explanation

• In a series circuit, components are connected one after another in a single path.
• The current is the same through all components.
• Conventional current flows from positive to negative, typically clockwise in diagrams.
• Parallel circuits have multiple paths, unlike series circuits.

Last verified on 17-03-2026