10 Science GK Questions with Answers

1. What does a virus need in order to stay alive?
   1. Only water
   2. A living host cell
   3. Sunlight
   4. Oxygen
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   Answer: (B) A living host cell

   Viruses are obligate parasites and cannot reproduce or grow without a living host cell.

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2. Why are appliances in houses joined in parallel?
   1. to save electricity
   2. to use less wire
   3. to keep the current equal
   4. so every appliance gets full voltage and all can run separately
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   Answer: (D) so every appliance gets full voltage and all can run separately

   In parallel every appliance has the same (230 V) potential difference and switching one off does not affect the others.

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3. Who discovered the first evidence of Homo erectus, and where?
   1. Raymond Dart, in South Africa
   2. Eugene Dubois, in Java
   3. Charles Darwin, in England
   4. Hugo de Vries, in Holland
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   Answer: (B) Eugene Dubois, in Java

   Eugene Dubois discovered the first evidence of Homo erectus in Java in 1891 and named it Pithecanthropus erectus.

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4. Approximate percentage (w/v) of "20 volume" H₂O₂?
   1. 3%
   2. 6%
   3. 10%
   4. 20%
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   Answer: (B) 6%

   20 × 68/22.4 ≈ 60.7 g/L ≈ 6%; "10 volume" ≈ 3%.

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5. Oxidation state of iron in K₄[Fe(CN)₆]?
   1. +3
   2. 0
   3. +2
   4. +6
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   Answer: (C) +2

   4(+1) + x + 6(−1) = 0 → x = +2; +3 in K₃[Fe(CN)₆].

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6. Who discovered the electron?
   1. Rutherford
   2. J. J. Thomson
   3. Chadwick
   4. Millikan
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   Answer: (B) J. J. Thomson

   In 1897 Thomson bent cathode rays in electric and magnetic fields and proved they are negatively charged particles (electrons); Millikan later measured the charge.

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7. What is the smallest unit of classification?
   1. Kingdom
   2. Family
   3. Species
   4. Phylum
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   Answer: (C) Species

   Species is the smallest and most basic unit of classification.

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8. What is the acceleration at the mean position in SHM?
   1. maximum
   2. zero
   3. constant but not zero
   4. negative maximum
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   Answer: (B) zero

   At the mean position the displacement is zero and a = −ω²x, so the acceleration is also zero; the velocity is maximum there.

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9. Why is thermal pollution harmful to aquatic life?
   1. The water turns salty
   2. The water freezes
   3. Hot water holds less oxygen
   4. Light is reduced
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   Answer: (C) Hot water holds less oxygen

   The solubility of gases falls as temperature rises, while fish need more oxygen.

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10. How did the Nuclear Suppliers Group (NSG) treat India, despite India never signing the NPT?
    1. it never made any exception
    2. it relaxed its guidelines specifically for India
    3. it applied the same rules to every country
    4. it excluded India from the group entirely
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    Answer: (B) it relaxed its guidelines specifically for India

    The NSG relaxed its guidelines specifically for India, even without India ever signing the NPT.

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