Explanation

A body is in equilibrium when the net force acting on it is zero, and it is not changing its motion.

This means that the body is either at rest or moving with a constant velocity (uniform speed), but not accelerating.

Explanation

An image formed by a convex lens is called real and inverted.

This occurs when the image is formed on the opposite side of the lens from the object.

This is upside down relative to the object.

Explanation

Kinetic energy is the energy an object has because of its motion.

If we want to accelerate an object, then we must apply a force.

Explanation

Power is the work done per unit time, measured in watts (W).

It represents the rate at which energy is transferred or work is done.

Additional Information:

• Efficiency is the ratio of output to input energy.
• Energy is the ability to do work.
• Force is a push or pull that can cause an object to change its motion.

Explanation

In the world of mechanics, there are four basic types of motion.

These four are:

1. Rotary,
2. Oscillating,
3. Linear
4. Reciprocating.

Explanation

• When two opposite poles (north-south or south-north) of magnets are brought close to each other, they attract each other.
• This is because opposite poles have different polarities and therefore pull each other together.

Explanation

The respiratory surface, where gas exchange occurs, is the alveoli.

Alveoli are tiny sacs located at the end of the bronchioles, deep in the lungs.

They provide a large surface area for the exchange of oxygen and carbon dioxide between the lungs and the bloodstream.

Explanation

• The correct answer is: Cell does not contain the hereditary material.

The cell theory postulates:

• All living organisms are made up of one or more cells.
• The cell is the fundamental unit of life.
• New cells are derived from pre-existing cells (biogenesis).

Explanation

The main function of the lungs is the process of gas exchange called respiration (or breathing).

In respiration, oxygen from incoming air enters the blood, and carbon dioxide, a waste gas from the metabolism, leaves the blood.

Explanation

Citric acid occurs naturally in:

• Lemons,
• Limes,
• Pineapples,
• Grapefruits,
• Berries (not blueberries),
• Tomatoes,
• Broccoli,
• Carrots,
• and some varieties of Peppers.