Explanation

Using navigation keys

Page Up: Move the cursor or page up one screen

Ctrl + Home: Move to the top of a document

Ctrl + End: Move to the bottom of a document

Page Down: Move the cursor or page down one screen

Explanation

Two or more forces acting on the same point at the same. time are called concurrent forces.

While

A concurrent coplanar force system is a system of two or more forces whose lines of action intersect at a common point.

Explanation

When an elevator accelerates downward, the normal force (apparent weight) decreases.

Thus, the person feels lighter than their actual weight.

Explanation

Fe3O4 occurs as a mineral with a chemical name Iron (II, III) oxide.

It is also known as Magnetite or Magnetic oxide.

Explanation

Water gas is a mixture of Carbon Monoxide (CO) and Hydrogen (H2).

Water Gas is formed when steam is passed over red-hot coke.

Formula: H₂O

Boiling point: 100°C

Explanation

The dielectric constant of water at around 18°C is approximately 80.

This high value makes water an excellent polar solvent for ionic and polar compounds.

Explanation

3% of Earth's water is fresh water.

2.5% of that fresh water is unavailable because it is:

• Locked in glaciers and polar ice caps
• Present in the atmosphere and soil
• Too deep underground to extract affordably

Only 0.5% of Earth's water is available as usable fresh water for human use.

Explanation

The mesosphere is the coldest layer of the atmosphere, with temperatures dropping as low as -90°C.

It lies above the stratosphere and below the thermosphere.

Explanation

They do not perform Baeyer's Test statement is not true because alkynes do perform Baeyer's Test, which detects unsaturation (like double or triple bonds).

In Baeyer's Test, potassium permanganate gets decolorized if alkynes are present, indicating a reaction.

Explanation

Salat-e-Khasoof is performed on the occasion of the Lunar eclipse (چاند گرہن)

It occurs in two or Four zakaah prayer 

It is a Nafli, not an obligatory prayer.

Additional information:

Salat ul  Kusuf (نمازكسوف)is a two or Four-zakaah prayer performed during a solar eclipseسورج گرہن,