Gravitation — Science STD 9 — Question

Is work a scalar or a vector quantity.

Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets.

When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?

What is the speed of sound:

1. In air?
2. In water?
3. In iron?

What is the reason for the different atomic masses of the isotopes of an element?

Which of the following terms apply to sound waves in air and which to water waves?
Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal.

Give one example where:
A force changes the speed of a moving body.

Name the property of one of the constituents which can be used to separate a mixture of salt and iodine.

Which of the following substances are elements?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

What kind of energy is possessedby the following?

A stretched rubber band.