General Science | Chemistry | Chemical and Physical Transformation
General Science | Chemistry | Chemical and Physical Transformation
1. Which of the following is an example of chemical change?
Dispersion of white light into the light of 7 colours when passed through a prism
Softening of vegetable when cooked
Wet soil lamp, when dried, get fragile
Dissolving of salt in water
Correct Answer
Wrong Answer
2. What form of energy is produced in the decomposition of water?
Light
Heat
Sound
Acid
Correct Answer
Wrong Answer
3. An example of physical change
Blackening of silverware
Burning of candle
Making of curd from milk
Dissolving of sugar in water
Correct Answer
Wrong Answer
4. Change of water into the vapour is called
Natural
Physical
Chemical
Biological
Correct Answer
Wrong Answer
5. Pasteurization is a process by which
Milk is preserved at a very low temperature for 24 hours
Milk is heated for 8 hours
First milk is heated up to a longer time and then cooled suddenly within specified time
None of the above
Correct Answer
Wrong Answer
6. Pasteurization is related to
Sterilization of milk
Dehydration of milk
Fermentation of milk
Distillation of milk
Correct Answer
Wrong Answer
7. Which of the following statement is not true?
Boiling point of any water solution is higher than pure water
Addition of solute to a solution increases its water potential
Water vapour pressure of any solution is lower than vapour pressure of pure water
When a solution is separated with the help of semi-permeable membrane, then water flow can be stopped by giving pressure to the solution
Correct Answer
Wrong Answer
8. Because of impurities the boiling point of a liquid
Increases
Decreases
Remains constant
They are not related
Correct Answer
Wrong Answer
9. Why does water boil at a temperature below 100°C at higher altitudes?
The atmospheric pressure decreases and hence boiling point is lowered
The gravitational attraction is less
Because of heavy winds in mountains
None of the above is correct
Correct Answer
Wrong Answer
10. Which type of colloidal system is expressed in the fog?
Liquid in a gas
Gas in a liquid
Solid in a gas
Liquid in liquid
Correct Answer
Wrong Answer
11. The technique of chromatography is used to
Identify colour substances
Determine the structure of substances
Dry distillation of colouring substances
Separate the substances from a mixture
Correct Answer
Wrong Answer
12. Process of solid camphor into camphor vapour is called
Vaporisation
Freezing
Melting
Sublimation
Correct Answer
Wrong Answer
13. Example of corrosion is
Black coating on Silver
Green coating on Copper
Brown coating on Iron
Above three
