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RRB NTPC Science — practice by topic

Browse 241 questions across 4 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Science topics

Science & Technology (82)General Science and Life Science (62)Indian Space Research Organisation (57)Environmental & Disaster Management (40)

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Artificial way of causing rainfall to reduce air pollution makes use ofRead the answer and worked solution →The organisms "Cicada, Froghopper and Pond skater" are :Read the answer and worked solution →Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that can pollinate this tree?Read the answer and worked solution →Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow?Read the answer and worked solution →

Worked practice questions

Artificial way of causing rainfall to reduce air pollution makes use of

  1. silver iodide and potassium iodide
  2. silver nitrate and potassium iodide
  3. silver iodide and potassium nitrate
  4. silver nitrate and potassium chloride
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Correct answer: A. silver iodide and potassium iodide

UPSC CSE Prelims 2025 (GS-I, Set A), Q.85. Official answer key: A.

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The organisms "Cicada, Froghopper and Pond skater" are :

  1. Birds
  2. Fish
  3. Insects
  4. Reptiles
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Correct answer: C. Insects

Answer: C. Cicada, Froghopper and Pond skater are all INSECTS. (1) Cicada (Hemiptera: Cicadidae) is a true bug famous for the loud songs of males. (2) Froghopper (Hemiptera: Cercopidae) is the insect whose nymphs produce the protective 'spit' (cuckoo-spit) on plants. (3) Pond skater (Hemiptera: Gerridae) is the aquatic insect that walks on the water surface thanks to hydrophobic legs and surface tension. All three are members of the order Hemiptera (true bugs). None are birds, fish or reptiles. Source: syllabus Biology Ch 4 (Animal Kingdom) and standard entomology references.

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Which one of the following shows a unique relationship with an insect that has coevolved with it and that is the only insect that can pollinate this tree?

  1. Fig
  2. Mahua
  3. Sandalwood
  4. Silk cotton
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Correct answer: A. Fig

Answer: A. Fig has the unique coevolved relationship with a single insect pollinator. The fig (Ficus species) has one of the most famous mutualistic relationships in nature with the FIG WASP (family Agaonidae). Each fig species is typically pollinated by ONE specific wasp species. The wasp enters through the ostiole of the fig syconium, pollinates the female flowers and lays eggs inside. The fig fruit is biologically an inverted inflorescence and cannot be pollinated by any other insect. Distractors fail: Mahua is pollinated by bats and various insects (not species-specific). Sandalwood is pollinated by various bees, flies and beetles. Silk cotton (Bombax ceiba) is pollinated by birds (sunbirds, mynas) and bats. Source: syllabus Biology Ch 1 (Reproduction in Organisms) + standard ecology references on plant-pollinator coevolution.

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