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- Question
Permanent hardness of water can be removed by adding
Options- A. chlorine
- B. washing soda
- C. potassium permanganate
- D. bleaching powder
- Correct Answer
- washing soda
- 1. The property of a substance to absorb moisture from the air on exposure is called
Options- A. osmosis
- B. deliquescence
- C. efflorescence
- D. desiccation Discuss
- 2. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
Options- A. bromine
- B. fluorine
- C. chlorine
- D. sulphur Discuss
- 3. Quartz crystals normally used in quartz clocks etc. is chemically
Options- A. silicon dioxide
- B. germanium oxide
- C. a mixture of germanium oxide and silicon dioxide
- D. sodium silicate Discuss
- 4. Sodium metal is kept under
Options- A. petrol
- B. alcohol
- C. water
- D. kerosene Discuss
- 5. Bell metal is an alloy of
Options- A. nickel and copper
- B. zinc and copper
- C. brass and nickel
- D. tin and copper Discuss
- 6. Monazite is an ore of
Options- A. titanium
- B. zirconium
- C. iron
- D. thorium Discuss
- 7. Which of the following is an element?
Options- A. Ruby
- B. Sapphire
- C. Emerald
- D. Diamond Discuss
- 8. The filament of an electric bulb is made of
Options- A. tungsten
- B. nichrome
- C. graphite
- D. iron Discuss
- 9. Which of the following is used as a lubricant?
Options- A. Graphite
- B. Silica
- C. Iron Oxide
- D. Diamond Discuss
- 10. The gas usually filled in the electric bulb is
Options- A. nitrogen
- B. hydrogen
- C. carbon dioxide
- D. oxygen Discuss
General Science problems
Search Results
Correct Answer: deliquescence
Correct Answer: sulphur
Correct Answer: silicon dioxide
Correct Answer: kerosene
Correct Answer: tin and copper
Correct Answer: thorium
Correct Answer: Diamond
Correct Answer: tungsten
Correct Answer: Graphite
Correct Answer: nitrogen
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