Explanation

The correct answer is: Molecules do not collide with one another

Gas molecules:

• Are widely separated
• Have low attractive forces
• Are free to move in any direction
• Collide with one another

Last verified on 08-03-2026

Explanation

• Amphibians are animals that live both in water and on land.
• Most amphibians lay their eggs in water because their eggs do not have a protective shell.
• Examples of Amphibians: Frog, Toad, Salamander, Newt, Caecilian

Last verified on 07-03-2026

Explanation

• A parachute increases air resistance (drag) when it opens in the air.
• This slows down the falling speed of a skydiver, allowing a safe landing.

Forces acting on a skydiver:

• Gravity (pulls downward)
• Air resistance (pushes upward)

Last verified on 07-03-2026

Explanation

• Friction is a force that opposes motion between two surfaces in contact.
• It slows down or stops objects when they move against each other.
• Friction helps us walk, write, and hold objects without slipping.
• Too much friction can cause heat and wear in machines.

Last verified on 07-03-2026

Explanation

• An eraser is usually made of rubber, which does not attract magnets.
  • Magnetic materials are substances that are attracted by a magnet.
  • Materials like iron and steel are magnetic, while rubber or plastic items are non-magnetic.

Additional information:

• Common Magnetic Materials:
  • Iron
  • Nickel
  • Cobalt
  • Steel (paper clip, iron nail)
  • Some alloys
  Non-magnetic examples: Rubber, wood, plastic, paper.

Last verified on 07-03-2026

Explanation

• In solids, particles are tightly packed and cannot move freely.
• Their motion is limited to vibrations around fixed positions.
• Solids retain definite shape and volume due to limited particle motion.

Last verified on 07-03-2026

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