Which of the following is a metal?

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Laughing gas has chemical composition of following two elements ?

A. Nitrogen + Hydrogen B. Nitrogen + Carbon C. Nitrogen + Oxygen D. Oxygen + Carbon E. None of these...

Which of the following atmospheric layers help in radio communication?

A. Exosphere B. Ionosphere C. Troposphere D. Stratosphere E. Ozone layer...

A body can escape the gravitational pull of the earth if it is thrown up with a velocity of?

A. 25 miles per sec b ) 60 miles per sec C. 7 miles per sec D. 10 miles per sec E. None of these...

Who developed the telegraph code?

A. Andre Ampere B. Samuel Morse C. Joseph Henry D. Jean Fourier...

Entomology Is the Study of___________?

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