List of top Science Questions

Certain force acting on a \(20\) \(kg\) mass changes its velocity from \(5\) \(m s^{–1}\) to \(2\) \(m s^{–1}\). Calculate the work done by the force.

A ball is gently dropped from a height of \(20\) \(m\). If its velocity increases uniformly at the rate of \(10\) \(m s^{-2}\), with what velocity will it strike the ground? After what time will it strike the ground?

Which of the following pairs will give displacement reactions?

For the following statements, write T for True and F for False.
(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.
(c) The mass of an electron is about \(\frac1{ 2000}\) times that of proton.
(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.