Discussion
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- Question
When an iron nail gets rusted, iron oxide is formed
Options- A. without any change in the weight of the nail
- B. with decrease in the weight of the nail
- C. with increase in the weight of the nail
- D. without any change in colour or weight of the nail
- Correct Answer
- with increase in the weight of the nail
- 1. Chemical formula for water is
Options- A. NaAlO2
- B. H2O
- C. Al2O3
- D. CaSiO3 Discuss
- 2. The most important ore of aluminium is
Options- A. galena
- B. calamine
- C. calcite
- D. bauxite Discuss
- 3. The two elements that are frequently used for making transistors are
Options- A. boron and aluminium
- B. silicon and germanium
- C. iridium and tungsten
- D. niobium and columbium Discuss
- 4. Potassium nitrate is used in
Options- A. medicine
- B. fertiliser
- C. salt
- D. glass Discuss
- 5. Which of the following is a non metal that remains liquid at room temperature?
Options- A. Phosphorous
- B. Bromine
- C. Chlorine
- D. Helium Discuss
- 6. Which of the following is the lightest metal?
Options- A. Mercury
- B. Lithium
- C. Lead
- D. Silver Discuss
- 7. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
Options- A. Television
- B. Refrigerator
- C. Tube light
- D. Cooking gas Discuss
- 8. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
Options- A. Argon
- B. Xenon
- C. Helium
- D. Krypton Discuss
- 9. Which of the gas is not known as green house gas?
Options- A. Methane
- B. Nitrous oxide
- C. Carbon dioxide
- D. Hydrogen Discuss
- 10. The gases used in different types of welding would include
Options- A. oxygen and hydrogen
- B. oxygen, hydrogen, acetylene and nitrogen
- C. oxygen, acetylene and argon
- D. oxygen and acetylene Discuss
General Science problems
Search Results
Correct Answer: H2O
Correct Answer: bauxite
Explanation:
Bauxite is an aluminium ore and is the main source of aluminium.
Correct Answer: silicon and germanium
Correct Answer: fertiliser
Correct Answer: Bromine
Correct Answer: Lithium
Correct Answer: Refrigerator
Correct Answer: Helium
Correct Answer: Hydrogen
Explanation:
In order, the most abundant greenhouse gases in Earth's atmosphere are:
* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* chlorofluorocarbons
* water vapor
* carbon dioxide
* methane
* nitrous oxide
* ozone
* chlorofluorocarbons
Correct Answer: oxygen and acetylene
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