General Science problems
- 1. Brass gets discoloured in air because of the presence of which of the following gases in air?
Options- A. Oxygen
- B. Hydrogen sulphide
- C. Carbon dioxide
- D. Nitrogen Discuss
Correct Answer: Hydrogen sulphide
- 2. Balloons are filled with
Options- A. nitrogen
- B. helium
- C. oxygen
- D. argon Discuss
Correct Answer: helium
- 3. Water is a good solvent of ionic salts because
Options- A. it has a high specific heat
- B. it has no colour
- C. it has a high dipole moment
- D. it has a high boiling point Discuss
Correct Answer: it has a high dipole moment
- 4. The group of metals Fe, Co, Ni may best called as
Options- A. transition metals
- B. main group metals
- C. alkali metals
- D. rare metals Discuss
Correct Answer: transition metals
- 5. Among the various allotropes of carbon,
Options- A. coke is the hardest, graphite is the softest
- B. diamond is the hardest, coke is the softest
- C. diamond is the hardest, graphite is the softest
- D. diamond is the hardest, lamp black is the softest Discuss
Correct Answer: diamond is the hardest, graphite is the softest
- 6. Which of the following is in liquid form at room temperature?
Options- A. Lithium
- B. Sodium
- C. Francium
- D. Cerium Discuss
Correct Answer: Francium
- 7. Air is a/an
Options- A. compound
- B. element
- C. electrolyte
- D. mixture Discuss
Correct Answer: mixture
- 8. Which of the following metals forms an amalgam with other metals?
Options- A. Tin
- B. Mercury
- C. Lead
- D. Zinc Discuss
Correct Answer: Mercury
- 9. From which mineral is radium obtained?
Options- A. Rutile
- B. Haematite
- C. Limestone
- D. Pitchblende Discuss
Correct Answer: Pitchblende
- 10. Which of the following are the ingredients of gun metal?
Options- A. Iron, Zinc, Titanium
- B. Iron, tin
- C. Iron, Brass, Tin
- D. Copper, Tin Discuss
Correct Answer: Copper, Tin
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