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NDA 2018 GAT · General Knowledge · Units and Measurements · easy

One horsepower is approximately equal to 746 watt. 2. One kilowatt-hour is equal to 3.6 × 10^6 joule.

Single correct option

Consider the following statements:
1. One horsepower is approximately equal to 746 watt.
2. One kilowatt-hour is equal to 3.6 × 10^6 joule.
Which of the statements is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (C) Both 1 and 2

The mechanical horsepower is defined as about 746 W, so statement 1 is correct. One kilowatt-hour is 1000 W for 3600 s, which is 3.6 × 10^6 J, so statement 2 is correct. A common error is to take the kilowatt-hour as 3600 J, forgetting the factor of 1000 in kilo.
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Original question written in the NDA 2018 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake