GOV EXAM ADDA

1. In 1775 a scientist experimentally showed that air consist of two gases. The name of the scientist is

Answer & Solution

2. Fullerene is

A. Artificial emery

B. A compound of carbon

C. An allotrope of carbon

D. A sunonym for carborundum

Answer & Solution

3. Iron is not dissolved in

Answer & Solution

4. Which of the following property is common in Graphite and Diamond?

A. Crystal structure

B. Density

C. Electrical conductivity

D. Relative atomic weight

Answer & Solution

5. The resistance of which of the following decreases with the rise of temperature

Answer & Solution

6. Mercury is a

A. Liquid non-metal

B. Solid non-metal

C. Solid metal

D. Liquid metal

Answer & Solution

7. Heavy water means

A. Water containing maximum density

B. Water containing salts of calcium and magnesium

C. Water which is used in heavy industries

D. Distilled water

Answer & Solution

8. In deep sea driving, drivers use a mixture of gases consisting of oxygen and

A. Helium(He) and Nitrogen(N)

B. Hydrogen (H)

C. Argon (Ar)

D. Helium (He)

Answer & Solution

9. Which gas is used as a fire extinguisher?

A. Carbon suboxide

B. Sulphur dioxide

C. Carbon dioxide

D. Carbon monoxide

Answer & Solution

10. The gas which turns into liquid at the lowest temperature among the following is

Answer & Solution

11. Which of the following is used for making smoke bombs?

Answer & Solution

12. Chemically Lime water is

A. Sodium Hydroxide

B. Calcium Carbonate

C. Calcium Hydroxide

D. Sodium Carbonate

Answer & Solution

13. Charcoal is used in water treatment as a/ an

A. Adsorbent

B. Coagulant

C. Solvant B) Absorbent C) Adsorbent D) Coagulant

D. Absorbent

Answer & Solution

14. Hydrogen Peroxide is an effective Sterilizing agent, which one of the following product is formed when it readily loses active oxygen?

Answer & Solution

15. Which of the following gas is coloured?

Answer & Solution

16. Diamond does not conduct electricity, because

A. There are only carbon atoms, present in it

B. No free electrons are present in it

C. It’s structure is very compact

D. It is of Crystalline nature

Answer & Solution

17. Soda water contains

Answer & Solution

18. Lime water becomes milky when exposed to air due to the presence of

Answer & Solution

19. What is dry ice?

A. Solid carbon dioxide

B. Glacial acetic acid

C. Dry ice without water

D. Benzoic acid

Answer & Solution

1. In 1775 a scientist experimentally showed that air consist of two gases. The name of the scientist is

2. Fullerene is

3. Iron is not dissolved in

4. Which of the following property is common in Graphite and Diamond?

5. The resistance of which of the following decreases with the rise of temperature

6. Mercury is a

7. Heavy water means

8. In deep sea driving, drivers use a mixture of gases consisting of oxygen and

9. Which gas is used as a fire extinguisher?

10. The gas which turns into liquid at the lowest temperature among the following is

11. Which of the following is used for making smoke bombs?

12. Chemically Lime water is

13. Charcoal is used in water treatment as a/ an

14. Hydrogen Peroxide is an effective Sterilizing agent, which one of the following product is formed when it readily loses active oxygen?

15. Which of the following gas is coloured?

16. Diamond does not conduct electricity, because

17. Soda water contains

18. Lime water becomes milky when exposed to air due to the presence of

19. What is dry ice?

20. What is the chemical composition of Heavy water?

21. Chemical Formula of Aluminium Nitride is

22. NaHCO3 is Chemical formula for_____

23. Which of the following elements has the lowest melting point?

24. Which of the following elements has the lowest melting point?

25. The Chemical formula of Ammonium nitrate is ______