Discussion
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- Question
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
- Correct Answer
- silicon and germanium
- 1. Potassium nitrate is used in
Options- A. medicine
- B. fertiliser
- C. salt
- D. glass Discuss
- 2. Which of the following is a non metal that remains liquid at room temperature?
Options- A. Phosphorous
- B. Bromine
- C. Chlorine
- D. Helium Discuss
- 3. What is laughing gas?
Options- A. Nitrous Oxide
- B. Carbon monoxide
- C. Sulphur dioxide
- D. Hydrogen peroxide Discuss
- 4. The average salinity of sea water is
Options- A. 3%
- B. 3.5%
- C. 2.5%
- D. 2% Discuss
- 5. The element common to all acids is
Options- A. hydrogen
- B. carbon
- C. sulphur
- D. oxygen Discuss
- 6. The most important ore of aluminium is
Options- A. galena
- B. calamine
- C. calcite
- D. bauxite Discuss
- 7. Chemical formula for water is
Options- A. NaAlO2
- B. H2O
- C. Al2O3
- D. CaSiO3 Discuss
- 8. 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 Discuss
- 9. Which of the following is the lightest metal?
Options- A. Mercury
- B. Lithium
- C. Lead
- D. Silver Discuss
- 10. 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
General Science problems
Search Results
Correct Answer: fertiliser
Correct Answer: Bromine
Correct Answer: Nitrous Oxide
Correct Answer: 3.5%
Correct Answer: hydrogen
Correct Answer: bauxite
Explanation:
Bauxite is an aluminium ore and is the main source of aluminium.
Correct Answer: H2O
Correct Answer: with increase in the weight of the nail
Correct Answer: Lithium
Correct Answer: Refrigerator
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