Explanation

• Gases do not have a definite shape or volume.
  • They take the shape and volume of the container they are in.
  • Gases can be compressed because the particles are far apart.

Last verified on 06-03-2026

Explanation

• Non-luminous objects do not produce their own light; they are visible because they reflect light from other sources.
• The Moon is non-luminous; it reflects sunlight.
• Luminous objects like the Sun, stars, and fireflies produce their own light.

Last verified on 06-03-2026

Explanation

• A translucent object allows some light to travel through it, but scatters or absorbs some of the light, making it semi-transparent.
• Examples: Frosted glass, wax paper, and tissue paper.

Additional information:

• Transparent: Allows all light to pass through, providing a clear view. 
• Opaque: Does not allow any light to pass through.

Last verified on 06-03-2026

Explanation

• When an opaque object moves closer to the light source, the shadow becomes larger.
• This is because the light rays spread out more, increasing the shadow’s size.
• Opposite effect: Moving the object away from the light source makes the shadow smaller.

Last verified on 06-03-2026

Explanation

• A solar eclipse occurs when the Moon passes between the Sun and Earth, blocking sunlight.
  • It can be total, partial, or annular, depending on the alignment.
  • During a total solar eclipse, the day briefly becomes dark.

Last verified on 06-03-2026

Explanation

• Arthropods are divided into different classes based on body structure, legs, and antennae.
• Spiders, ticks, and mites have eight legs and no antennae, which classifies them differently from insects.
• These belong to the class Arachnida.

Last verified on 11-02-2026

Explanation

• Pressure is a fundamental physical quantity that is defined as the force exerted per unit area.
• It is a measure of the strength of a force acting on a surface.
• It is typically measured in units such as Pascals (Pa) or pounds per square inch (PSI).

Last verified on 10-02-2026

Explanation

• Xylem is the plant tissue responsible for transporting water and minerals from roots → stem → leaves.
• It consists of continuous tubes made of dead cells for easy water flow.

Additional information:

• Phloem: Transports food (sugars) from leaves to other parts

Explanation

Scalar quantities are physical quantities that have only magnitude (amount or size) but no direction.

Examples of scalar quantities include:

• Mass
• Temperature
• Time
• Energy
• Distance

Last verified on 07-02-2026

Explanation

A nucleotide, the building block of DNA and RNA.

It consists of three components:

1. A phosphate group (phosphate)
2. A sugar molecule (deoxyribose in DNA and ribose in RNA)
3. One of four nitrogenous bases (Adenine, Guanine, Cytosine, and Thymine in DNA; Adenine, Guanine, Cytosine, and Uracil in RNA)

Last verified on 07-02-2026