Explanation

Oil and gas are not renewable energy sources. 

They are fossil fuels that deplete over time and take millions of years to form.

The renewable energy sources are:

• Water energy
• Wind energy
• Tidal energy
• Hydroelectric
• Ocean energy
• Geothermal energy
• Biomass
• Biogas

The non-renewable energy sources are:

• Fossil fuels or Hydrocarbon fuel (Oil, Natural gas, Coal)
• Nuclear energy

Explanation

When a generator (alternator) produces more electrical energy than required, the surplus energy is used to recharge the battery. This process is called charging the battery.

Charging the battery reverses the chemical reaction that occurs during discharge, restoring the battery's state of charge and preparing it for future use.

Explanation

There are 5 planets visible without a telescope,

1.Mercury,

2.Venus,

3.Mars,

4.Jupiter

5.Saturn.

Uranus and Neptune are the two planets in our solar system that are farthest from Earth.

They have a very low brightness, making them difficult to observe with the naked eye.

A telescope is required to observe these planets.

Explanation

• When two bulbs are connected in a series circuit and one bulb blows, the entire circuit is interrupted, and the other bulb will also stop glowing, i.e., also blow (blast).
• This is because there is no longer a complete path for current to flow through the circuit.

Explanation

• Binoculars typically use Porro prisms, which are a type of reflecting prism that uses total internal reflection to redirect light.
• Porro prisms are named after their inventor, Ignazio Porro, and are widely used in binoculars and other optical instruments.

Explanation

• The speed of sound in aluminium is approximately 6420 meters per second.
• It is significantly faster than the speed of sound in air due to aluminium's higher density and elastic properties.

The speed of sound in different materials:

• Air: 332 m/s
• Sea water: 1530 m/s
• Lead: 2160 m/s
• Gold: 3240 m/s
• Brick: 3650 m/s
• Copper: 4760 m/s
• Glass: 5100 m/s
• Aluminium: 6420 m/s

Explanation

• When the Moon and the Sun are on the same side of the Earth, we see a New Moon.
• This occurs when the Moon is between the Earth and the Sun, making the side of the Moon facing the Earth unilluminated.

Explanation

• Inertia is the tendency of an object to resist changes in its motion.
• As described by Newton's First Law of Motion (also known as the Law of Inertia).
• This means that an object at rest will remain at rest, and an object in motion will continue moving in a straight line, unless acted upon by an external force.

Explanation

Force cannot change the content of an object, as it only affects the object's motion, shape, and position, but not its composition or internal structure.

Explanation

• Substances with permeability less than that of free space (μ₀) are called diamagnetic materials.
• These materials are weakly repelled by magnetic fields and have a relative permeability (μr) less than 1.