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- Question
Metal extracted from seawater
Options- A. Potassium
- B. Calcium
- C. Magnesium
- D. Sodium
- Correct Answer
- Magnesium
ExplanationMagnesium is dissolved in seawater at a concentration of about 1,000 parts per million and is the only metal directly extracted from seawater.
- 1. The blue colour of the clear sky is due to
Options- A. Diffraction of light
- B. Dispersion of light
- C. Reflection of light
- D. Refraction of light Discuss
- 2. What does airbag, used for safety of car driver, contain?
Options- A. Sodium bicarbonate
- B. Sodium azide
- C. Sodium nitrite
- D. Sodium peroxide Discuss
- 3. In a laser (say neon laser) all the atoms emit the light waves of
Options- A. Same frequency
- B. Same amplitude
- C. Same phase
- D. All the above Discuss
- 4. Tides are primarily a result of the ____ ?
Options- A. Attraction of the Moon
- B. Farrel's law
- C. Ocean Currents
- D. Earth's pressure system Discuss
- 5. Lichens are the best indicator of
Options- A. Air pollution
- B. Sound pollution
- C. Noise pollution
- D. Water pollution Discuss
- 6. Heavy water is
Options- A. PH7
- B. rain water
- C. deuterium oxide
- D. tritium oxide Discuss
- 7. What invisible force holds you onto the earth, so that you don't simply fall off?
Options- A. gravity
- B. magnetism
- C. wind
- D. speed Discuss
- 8. What is the most common form of iodine deficiency? Discuss
- 9. As you go down into a well, your weight
Options- A. increases slightly
- B. decreases slightly
- C. remains exactly the same
- D. none of these Discuss
- 10. What is the full form of 'laser'? Discuss
General Science problems
Search Results
Correct Answer: Dispersion of light
Correct Answer: Sodium azide
Correct Answer: All the above
Correct Answer: Attraction of the Moon
Correct Answer: Air pollution
Explanation:
1. Lichens are plants that grow in exposed places such as rocks or tree bark.
2. Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.
3. They need to be very good at absorbing water and nutrients to grow there.
Correct Answer: deuterium oxide
Correct Answer: gravity
Correct Answer: Goitre
Correct Answer: decreases slightly
Correct Answer: Light amplification by stimulated emission of radiation
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