Who discovered the law of attraction and repulsion in electric charges ?

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Radioactivity was discovered by __________?

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Spring tides occur on new moon and full moon days because on these days_____________?

A. Sun, moon and earth are in a straight line B. Sun and earth are at right angles C. Sun and moon are at right angles D. Earth and moon are at right angles...

HIV virus causes___________?

A. Hepatitis A B. Hepatitis B C. TB D. AIDS...

Inside which organ is the gallbladder located?

A. Pancreas B. Liver C. Kidney D. Small intestine...

Red + Green + Blue = ________?

A. Maroon B. White C. Black D. None of the above...