Explanation

The F1 key is used to Help

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F1: Opens the Help system for the active window.

F4: Creates a new document in programs that support this command

pressing F2 renames the file

F5 is also commonly used as a reload key

The F7 key is widely used to spell check 

Explanation

Explanation

Bangladesh Capital is Dhaka.

Bangladesh Currency is Taka.

Bangladesh official language is Bangla.

Bangladesh located is in Continent Asia.

Bangladesh Primary Religion is Islam.

Bangladesh Head of Govt. is Prime Minister – Sheikh Hasina.

Bangladesh Parliament called Jatia Parliament.

Explanation

By default, a document uses portrait orientation, because most documents are primarily text, and text works well in this vertical format.

Explanation

Dolly the sheep was the first clonned animal

In 1996, Dolly the sheep—the first mammal to have been successfully cloned from an adult cell—is born at the Roslin Institute in Scotland.

Explanation

The first Round Table Conference convened from 12 November 1930 to 19 January 1931

The Second Round table conference was held from 7 September 1931 to 1 December 1931 in London. 

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The Third Round Table Conference was held in 1932 between November and December. 

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Explanation

• LPG stand for Liquefied Petroleum Gas
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• In order to supply fuel efficiently to the populace, we have four LPG Storage and Bottling Plants, one each in Karachi, Lahore, Dhurnal, and Akora Khattak.
• LPG is used as a fuel gas in heating appliances, cooking equipment, and vehicles
• LPG is prepared by refining petroleum or "wet" natural gas,
•  LPG was first produced in 1910 by Walter O. Snelling.

Explanation

Ernest Rutherford showed (1919) that nitrogen under alpha-particle bombardment ejects what appear to be hydrogen nuclei.

By 1920 Ernest Rutherford had accepted the hydrogen nucleus as an elementary particle, naming it proton.

while

Electron was discovered by J. J. Thomson in 1897.

Explanation

Explanation

Water has a maximum density of 4 degrees Celsius.

while

Water freezes at 0 degrees Celsius and 32 degrees Fahrenheit.