Lakshya Education MCQs

Question: The most abundant element is
Answer: Option C

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Question 1. A balloon filled with helium rises in air because
  1.    Air exerts an upward force on the balloon
  2.    The balloon is weightless
  3.    Helium is less dense than air
  4.    Helium pushes down on the air below the balloon
Answer: Option C
Question 2. Which one of the following is also known as solution ?
  1.    A compound
  2.    A homogeneous mixture
  3.    A heterogeneous mixture
  4.    A suspension
Answer: Option B
Question 3. Which of the following is not a noble gas ?
  1.    Hydrogen
  2.    Helium
  3.    Neon
  4.    Argon
Answer: Option A
Question 4. The gas used for filling weather balloons is
  1.    Helium
  2.    Hydrogen
  3.    Air
  4.    Nitrogen
Answer: Option A
Question 5. Element 106 was discovered by
  1.    Rutherford
  2.    Seaborg
  3.    Lawrence
  4.    Kurchatove
Answer: Option B
Question 6. The coloured discharge tubes for advertisement mainly contain
  1.    Xenon
  2.    Argon
  3.    Helium
  4.    Neon
Answer: Option D

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