Conduction → heat transfer in solid
Convection → heat transfer in fluid
Radiation → heat transfer through vacuum

When a ray of light approaches a smooth polished surface and the light ray bounces back, it is called the reflection of light. The incident light ray that land on the surface is reflected off the surface. The ray that bounces back is called the reflected ray.

The mechanical energy is used to vibrate the metallic body of the ring-bell. When the bell vibrates, it produces sound energy.

A fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. It is designed to melt and separate in the event of excessive current thereby stopping or interrupting the current.

Moon doesn't have its own light and it either reflects or refracts the light of the sun. Hence it can be said that the moon is not the natural source of light.

Light travels in a straight line

From the above experiment when one of the cardboard sheets is moved to either side, it is observed that the flame is no longer visible. This is because the light cannot bend to pass through the hole.

Examples of Straight-Line Motion of Light

1. When a lamp, torch, or another source of light emits light, it travels in a straight line

2. When sunlight enters a dusty environment through tiny holes, a straight-line trail of light is apparent

3. The object will become invisible when an opaque object is placed in front of it. The reason for this is that an opaque object prevents light from bending through its corners

An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.

Incisors

Incisors are the four front teeth in the centre of each jaw. Their cutting edges are broad and sharp like chisel. They are used for biting and cutting.

TRANSPORT SYSTEM IN PLANTS

Increasing means from the lowest to the highest.

Hard water is water that does not lather easily/readily with soap/water which contains Ca2+/Mg2+/Ca/Mg ions/salt.

You simply filter the liquid from the solid.

In a neutral atom, the number of protons balances that of electrons. Protons are positively charged and the electrons are negatively charged. When an atom gains more electrons, the negative charge becomes higher than the positive charge, hence the atom becomes a negative ion (Anion).

Carbon dioxide is a compound with the chemical formula CO₂.

Schistosomiasis, also known as bilharzia, is an infection caused by a parasitic worm that lives in fresh water in subtropical and tropical regions.

CATERPILLAR PARASITE

Acid turns blue litmus paper red. You can use the acronym BAR to remember which stands for Blue Acid Red where B stands for Blue litmus paper and A stands for Acid and R stands for Red.

Once you know that of the acid when you remember BAR, you can reverse it for the base. For a base or alkaline, red litmus paper turns blue.

Weight is the force acting on an object due to gravity. The weight of an object depends on the gravitational field at the point in space where the object is.

Weight or Force = Mass x Acceleration due to gravity

Difference between adhesive and cohesive force

Cohesive force is the force that attracts molecules of the same substance while Adhesive force is the force that binds molecules of different substances together.

Why water wets glass

Water wets glass and spreads out on it because the adhesive forces between the liquid and the glass are stronger than the cohesive forces within the water.

Capillary action is the process of a liquid flowing in a narrow space without the assistance of, or even in opposition to, any external forces like gravity.