Atoms and Molecules — Science STD 9 — Question

When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the scattering of light by milk. This indicates that milk is :

The father of modern cytology is ______________.

............... of an element are the atoms of same element having same atomic number but different mass number.

Change in the state of matter can be brought by changing :

A rigid body of mass m kg is lifted uniformly by a man to a height of one metre in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done on the body against gravitation in both the cases are in ratio:

A force acts between two bodies if:

Membrane which allows passage of only solvent through it is:

_________ is used as a colouring agent to colour the slide which is to be observed under the microscope.

What is known as thrust: