alleryStart learning →A man walks 1.2 km at a steady 4 km/h. How long does the walk take?
- 48 min
- 18 min
- 12 min
- 30 min
Show answer and solution
Correct answer: B. 18 min
Time is 1.2 km divided by 4 km/h, which is 0.3 h or 18 minutes.
Olympiad (Class 7) Motion and time — practice questions — page 2
Explore 52 free Motion and time questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–52 of 52.
A man walks 1.2 km at a steady 4 km/h. How long does the walk take?Read the answer and worked solution →A cyclist rides at a steady 5 m/s. How long does she need for 1 km?Read the answer and worked solution →Train P runs at 60 km/h and train Q at 90 km/h over the same 180 km. How much sooner does Q arrive?Read the answer and worked solution →What does the period of a simple pendulum mean?Read the answer and worked solution →A heavier bob replaces a lighter bob on a pendulum of the same length. What happens to its period?Read the answer and worked solution →A pendulum clock runs fast. What adjustment should be made?Read the answer and worked solution →What name is given to a pendulum's nearly constant period for small swings of different size?Read the answer and worked solution →In 1656 which Dutch scientist built the first pendulum clock?Read the answer and worked solution →Why does the swing of a real pendulum slowly die down?Read the answer and worked solution →Pendulum clocks ran slower in summer. What was the cause?Read the answer and worked solution →About how long is a seconds pendulum used in good clocks?Read the answer and worked solution →A mantel clock uses a 25 cm pendulum instead of a 1 m one. Its period is what?Read the answer and worked solution →The Foucault pendulum of 1851 gave a demonstration of which fact?Read the answer and worked solution →Around which year did Galileo begin to study pendulums?Read the answer and worked solution →What replaced pendulum clocks as the world's best timekeepers?Read the answer and worked solution →A pendulum takes 2 s per oscillation. How many oscillations occur in 1 minute?Read the answer and worked solution →A pendulum makes 20 oscillations in 40 s. What is its period?Read the answer and worked solution →What is the SI unit of the period of a pendulum?Read the answer and worked solution →Why must a pendulum clock be fixed firmly to a sturdy wall?Read the answer and worked solution →Why were mercury and gridiron pendulums invented in the 1700s?Read the answer and worked solution →A vehicle covers 1 km every minute. What is its speed in km/h?Read the answer and worked solution →A body's distance is doubled and its time is halved. By what factor does its speed change?Read the answer and worked solution →
Worked practice questions
A cyclist rides at a steady 5 m/s. How long does she need for 1 km?
- 5 s
- 200 s
- 500 s
- 20 s
Show answer and solution
Correct answer: B. 200 s
1 km is 1000 m, and 1000 m divided by 5 m/s is 200 s.
Train P runs at 60 km/h and train Q at 90 km/h over the same 180 km. How much sooner does Q arrive?
- 1.5 h
- 2 h
- 30 min
- 1 h
Show answer and solution
Correct answer: D. 1 h
P takes 3 h and Q takes 2 h for 180 km, so Q is 1 h ahead.
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