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Chemical Sciences Test 1: Basic Examination Quiz for NET Aspirants

1. When iron rusts, its weight

  • Increases
  • Decreases
  • Remains same
  • None of the above

2. Sodium bicarbonate is useful as a fire extinguisher because it has

  •  It emits a foam which extiguishes fire
  •  It releases water which extiguishes fire
  •  It serves as a blanket for fire
  •  It decomposes on heating to give carbon dioxide

3. Dry ice at room temperature gives

  •  Water
  •  Carbon dioxide
  •  Salty water
  •  Liquid Carbon dioxide

4. Entropy change of a system depends on

  • Temperature
  •  Volume
  •  Pressure
  •  None of the above

5. The total entropy change for a reversible isothermal cycle is

  •  Variable
  •  Zero
  •  Negative
  •  Positive

6. Which of the following contains Carbon

  •  Lignite
  •  Bauxite
  •  Phosphorite
  •  Chromite

7. Ozone is important to mankind because

  • It creates a protective covering against ultraviolet rays.
  • It releases oxygen into the air.
  • It helps in maintaining the earth’s temperature.
  • It helps in releasing hydrogen into the atmosphere.

8. Radio carbon dating is used to find the age of

  •  Building
  •  Fossils
  •  Babies
  •  Rocks

9. The green color of the gas is due to

  •  Cellulose
  •  Starch
  •  None of the above
  •  Chlorophyll

10. Artificial rain is produced by seeding clouds with

  •  Silver iodide
  •  Copper sulphate
  •  Silver nitrate
  •  Potassium iodide

11. Which of the following is a mixture?

  •  Baking soda
  •  Milk
  •  Chloroform
  •  Copper wire

12. A mixture of naphthalene and sand is separated by

  •  Evaporation
  •  Using a magnet
  •  Sedimentation
  •  Sublimation

13. The kinetic energy of gas molecules

  •  Decreases with increase in temperature
  •  Is unaffected by temperature variations
  •  Increases with increase in temperature
  •  Increases with decrease in temperature

14. The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by

  • Z
  • A-Z
  • A+Z
  • A

15. Which of the following compounds is formed by the sharing of electrons?

  •  Sodium chloride
  •  Carbon tetrachloride
  •  Magnesium chloride
  •  Silver fluoride

16. According to the modern periodic law, the properties of elements are periodic functions of their

  •  Number of neutrons
  •  Atomic number
  •  Atomic mass
  •  Valency

17. The non-metal which has a shining appearance is

  •  Sulphur
  •  Bromine
  •  Phosphorus
  •  Iodine

18. Which is the ‘odd man’ in the following?

  • Common salt
  • Cane sugar
  • Water
  • Brass

19. The symbol of antimony is

  •  Sb
  •  A
  •  Au
  •  S

20. The formula for aluminum sulfide is

  • Al2S3
  • Al3S2
  • AlS2
  • AlS

21. Variable valency is exhibited by

  • Zinc
  • Barium
  • Tin
  • Sodium

22. Which of the following is called the “King of chemicals”?

  • Nitric acid
  • Hydrochloric acid
  • Silver nitrate
  • Sulfuric acid

23. Who discovered isotopes?

  • Dalton,
  • Roentgen
  • Soddy
  • Davvy

24. The symbol of “W” stands for

  • Gold
  • Lead
  • Tin
  • Tungsten

25. Brimstone stands for

  • Boron
  • Diamond
  • Phosphorus
  • Sulphur

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