who discovered oxygen

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Copper can be converted into gold by ?

A. Artificial radioactivity B. heating C. Electroplating D. Chemical reaction...

Chemical name of vinegar is _____________?

A. Sodium Nitrate B. Dilute acetic acid C. Chloride of lime D. Calcium E. None of these...

In a railway track, two rails are joined end to end with a gap tin between them because?

A. Steel can be saved B. Accidents due to contraction in winter can be avoided C. Air gaps are necessary for bearing the weight of running train D. Accidents due to expansion in summer can be avoided E. All of these...

The largest part of the human brain is ___________?

A. Medulla oblongata B. Cerebellum C. Cerebrum D. None of these...

The process whereby energy is dissipated from the oscillating system is called__________?

A. Oscillation B. Damping C. Resonance D. None of these...