Explanation

Iron oxide is a chemical compound  of oxygen and iron and is most commonly found in the earth's crust in the

form of hematite (Fe2O3). It also exists in the form of

magnetite (Fe3O4).

Explanation

The salt content in seawater is mainly due to the presence of sodium chloride i.e sodium and chlorine. The abundant element in  seawater is chloride, which accounts for 1.94% of  the total composition. 

 Chloride is followed by 1.08% sodium, 0.04% potassium  and a small amount of iodine.

Explanation

The Earth's South Magnetic Pole is geographically north, and the Earth's magnetic North Pole is geographically south, so free-moving magnets are always north-south.

Explanation

When sound is reflected from floor ceiling or a wall, it mixes with the original sound and change its complexion, it is called as Reverberation

Explanation

The density of water depends on temperature and salt content. Density is measured as mass (g) per unit  volume (cc). Water has the highest density at 3.98 ° C and the lowest density at 0 ° C (freezing point).

Explanation

Hazrat Umar (RA)  adopted the title of Ameer-ul-Momineen for the first time.

On his accession in 634, Umar ibn Khattab, the Second Rashidun Caliph, was given the title.

According to At-Tabaqat al Kubra, When Abu Bakr died, Muslims of the time said: “We are the Mu'minin and Umar is our Amir (Commander).”

After this, the title Amir al-Mu'minin was held by Umar ibn Khattab who was also the first one to be given this title.

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Explanation

Explanation

The Great Mosque in Damascus, also known as the Umayyad Mosque, is the earliest surviving stone mosque built by the Umayyad Caliph Al Waleed I (Waleed bin Abdul Malik) between 705 and 715 AD.

Explanation

In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube.

Water freeze at 32 F and boils at 212 F

Explanation

Hazrat Yousaf (AS) was put into the jail by the king of Egypt. He remained behind the bars for  5 years.

Hazrat Yousaf (AS) remained in the well for 3 DAYS.