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Olympiad (Class 7) Science — practice by topic

Browse 803 questions across 14 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

Reproduction in Plants (70)Electric current and its effects (65)Winds, storms and cyclones (61)Nutrition in plants and animals (60)Transportation in plants and animals (60)Weather, Climate and Adaptations of Animals (60)Acids, bases and salts (58)Heat (58)Natural resources and their conservation (58)Light (54)Fibre to fabric (52)Motion and time (52)Respiration in organisms (49)Physical and chemical changes (46)

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A car covers 150 km in 3 hours at a steady pace. What is its speed?Read the answer and worked solution →A runner covers 100 m in 20 s. What is her speed?Read the answer and worked solution →A train runs at an average speed of 60 km/h for 4 hours. How far does it go?Read the answer and worked solution →A bus keeps an average speed of 40 km/h. How long does it need for 200 km?Read the answer and worked solution →

Worked practice questions

A car covers 150 km in 3 hours at a steady pace. What is its speed?

  1. 60 km/h
  2. 45 km/h
  3. 50 km/h
  4. 450 km/h
Show answer and solution

Correct answer: C. 50 km/h

Speed is distance divided by time, so 150 km over 3 h gives 50 km/h.

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A runner covers 100 m in 20 s. What is her speed?

  1. 5 m/s
  2. 2 m/s
  3. 0.2 m/s
  4. 20 m/s
Show answer and solution

Correct answer: A. 5 m/s

Speed equals distance per unit of time, and 100 m divided by 20 s is 5 m/s.

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A train runs at an average speed of 60 km/h for 4 hours. How far does it go?

  1. 240 km
  2. 64 km
  3. 60 km
  4. 15 km
Show answer and solution

Correct answer: A. 240 km

Distance is average speed times time, so 60 km/h multiplied by 4 h gives 240 km.

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How to practise

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  2. Open the question to check the correct answer and read its worked solution.
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