Explanation

The bar is a metric unit of pressure, but not part of the International System of Units (SI).

Bar is defined as 100,000 Pa (100 kPa)

Explanation

Combustion is when fuel reacts with oxygen to produce heat.

Chemical reactions that produce heat we call exothermic reactions.

Most vehicles use an engine to convert heat energy into mechanical energy.

 Mechanical energy gets transferred to the vehicle's moving parts, like wheels or propellers.

Explanation

In general, the cancer in a human body is caused by changes to DNA.

DNA stands for Deoxyribonucleic acid

Explanation

• The sun rises in the East and sets in the West.
• This means that the Earth is rotating from West to East. 
• Earth revolves in orbit around the Sun in 365 days, 6 hours, 9 minutes.
• With reference to the stars, at a speed ranging from 29.29 to 30.29 km/s.
• The 6 hours, 9 minutes add up to about an extra day every fourth year,
• which is designated a leap year, with the extra day added as February 29th.

Last updated 06 Nov 2026 by NA

Explanation

Please remember the following information about the number of moons in the planets:

Saturn: 145

Saturn has 145 moons recognized by the International Astronomical Union. 

Uranus: 27

Neptune: 14

Mars: 2

Earth: 1

Venus: 0

Mercury: 0

Explanation

The first law of thermodynamics is based on "

the law of conservation of energy, which states that energy cannot be created or destroyed, but can be transferred from one form to another".

Explanation

The density of ice is 0.9168 g/cm 3.

The density of water is 1 g/cm 3

Explanation

When an object is placed between the focus and centre of curvature, the concave mirror can form an image larger than the actual object.

 ****

Concave Mirror used for:

1. Shaving mirrors.
2. Head mirrors.
3. Ophthalmoscope.
4. Astronomical telescopes.
5. Headlights.
6. Solar furnaces.

Explanation

Cadmium rods are inserted in nuclear reacter to absorb the extra nucleons.

Cadmium has a high thermal neutron absorption cross section.

Therefore, cadmium rods will absorb neutrons, making them unavailable to cause fission.

**** 

Explanation

Photon with energy greater than 1.02 MeV can interact with matter as Pair Production.

MeV stands for Mega electron-volt.

****