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RRB Group D Science — practice by topic

Browse 151 questions across 98 Science topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Which instrument is used to find out wind direction?Read the answer and worked solution →Which India-born physicist is credited with inventing the optical fibre?Read the answer and worked solution →What is the freezing point of water on the Fahrenheit scale?Read the answer and worked solution →Which of the following mammals lays eggs?Read the answer and worked solution →

Worked practice questions

Which instrument is used to find out wind direction?

  1. Wind vane
  2. Hygrometer
  3. Anemometer
  4. Wind gauge
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Correct answer: A. Wind vane

1. A hygrometer measures humidity and an anemometer measures wind speed. 2. A wind vane is a pointer that turns freely and aligns with the blowing wind. 3. Therefore a wind vane is used to determine wind direction. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.8._

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Which India-born physicist is credited with inventing the optical fibre?

  1. C.V. Raman
  2. Narinder Singh Kapany
  3. Satyendra Nath Bose
  4. Homi J. Bhabha
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Correct answer: B. Narinder Singh Kapany

1. C.V. Raman, S.N. Bose and Homi Bhabha worked in spectroscopy, statistics and nuclear physics. 2. Narinder Singh Kapany pioneered the practical use of optical fibres. 3. He is widely called the 'Father of Fibre Optics', so the answer is Kapany. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.16._

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What is the freezing point of water on the Fahrenheit scale?

  1. 212°F
  2. 100°F
  3. 32°F
  4. 180°F
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Correct answer: C. 32°F

1. Water freezes at 0°C on the Celsius scale. 2. Convert using F = (C × 9/5) + 32 = (0 × 9/5) + 32. 3. This gives 32°F as the freezing point. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.19._

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