Chemical and Physical Transformation Question Answer For TET & TGT Exam
||Chemical and Physical Transformation Question Answer For TET & TGT Exam||Chemical and Physical Transformation Question Answer For HPTET & HPTGT Exam||
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CHEMICAL & PHYSICAL TRANSFORMATION MCQ
1. Which of the following is an example of chemical change?
(A) Dispersion of white light into the light of 7 colours when passed through a prism
(B) Softening of vegetable when cooked
(C) Wet soil lamp, when dried, get fragile
(D) Dissolving of salt in water
2. What form of energy is produced in the decomposition of water?
(A) Light
(B) Heat
(C) Sound
(D) Acid
3. An example of physical change
(A) Blackening of silverware
(B) Burning of candle
(C) Making of curd from milk
(D) Dissolving of sugar in water
4. Change of water into the vapour is called
(A) Natural
(B) Physical
(C) Chemical
(D) Biological
5. Pasteurization is a process by which
(A) Milk is preserved at a very low temperature for 24 hours
(B) Milk is heated for 8 hours
(C) First milk is heated up to a longer time and then cooled suddenly within specified time
(D) None of the above
6. Pasteurization is related to
(A) Sterilization of milk
(B) Dehydration of milk
(C) Fermentation of milk
(D) Distillation of milk
7. Which of the following statement is not true?
(A) Boiling point of any water solution is higher than pure water
(B) Addition of solute to a solution increases its water potential
(C) Water vapour pressure of any solution is lower than vapour pressure of pure water
(D) When a solution is separated with the help of semipermeable membrane, then water flow can be stopped by giving pressure to the solution
8. Because of impurities the boiling point of a liquid
(A) Increases
(B) Decreases
(C) Remains constant
(D) They are not related
9. Why does water boil at a temperature below 100ºC at higher altitudes?
(A) The atmospheric pressure decreases and hence boiling point is lowered
(B) The gravitational attraction is less
(C) Because of heavy winds in mountains
(D) None of the above is correct
10. Which type of colloidal system is expressed in the fog?
(A) Liquid in a gas
(B) Gas in a liquid
(C) Solid in a gas
(D) Liquid in liquid
11. The technique of chromatography is used to
(A) Identify colour substances
(B) Determine the structure of substances
(C) Dry distillation of colouring substances
(D) Separate the substances from a mixture
12. Process of solid camphor into camphor vapour is called
(A) Vaporisation
(B) Freezing
(C) Melting
(D) Sublimation
13. Example of corrosion is
(A) Black coating on Silver
(B) Green coating on Copper
(C) Brown coating on Iron
(D) Above three
14. Which of the following is/are the example/examples of chemical change?
1. Crystallization of sodium chloride
2. Melting of ice
3. Souring of milk
Select the correct answer using the code given below.
(A) Only 1 and 2
(B) Only 3
(C) 1, 2 and 3
(D) None of the above
15. Assertion (A): A chemical reaction becomes faster at a higher temperature.
Reason (R): At higher temperature, molecular motion becomes more rapid.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
16. Give a thought to these statements.
Statement (A): Temperature below 0ºC is achieved by the mixture of salt and ice.
Reason (R): Salt increases the freezing point of ice
. In the context of above statements which one of the following is correct?
(A) Both (A) and (R) are true and (R) is the correct explanation of (A)
(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
(C) (A) is true, but (R) is false
(D) (A) is false, but (R) is true
17. Give thought to following statements.
1. In the process of osmosis, the solvent moves towards a dilute solution from the concentrated solution.
2. In reverse osmosis internal pressure but upon a dilute solution.
Among above statements which is/ are correct.
(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2
18. Match List-I (Oxidation number) with List-II (the element) and select the correct answer using the code given below the lists.
List-I
(a) 2
(b) 3
(c) 4
(d) 6
List-II
1. Oxidation number of Mn in MnO2
2. Oxidation number of S in H2 SO4
3. Oxidation number of Ca in CaO
4. Oxidation number of Al in NaAlH4
Code (a) (b) (c) (d)
(A) 3 4 1 2
(B) 4 3 1 2
(C) 3 4 2 1
(D) 4 3 2 1
||Chemical and Physical Transformation Question Answer For TET & TGT Exam||Chemical and Physical Transformation Question Answer For HPTET & HPTGT Exam||
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