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18 Questions

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Constructing a Sundial for Timekeeping

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Questions and Answers

What is the purpose of marking the position of the tip of the shadow of the gnomon on the sundial throughout the day?

To track the movement of the sun (correct)

To measure rainfall

To observe the phases of the moon

To determine the temperature variations

Why should the gnomon always be placed in the North-South direction on a sundial?

To observe cloud formations

To ensure accurate time measurement (correct)

To study plant growth

To track animal migration

In constructing a sundial, why is it important to connect each shadow point with the centre of the base of the gnomon?

To show seasonal changes

To form a decorative pattern

To indicate the hours (correct)

To create a symmetrical design

What is the primary function of a sundial?

Measure time of day Signup and view all the answers

How can a sundial be used to tell time at different parts of the day?

By marking shadow positions at specific times during the day Signup and view all the answers

What is one key element in using a sundial to track time effectively?

Making sure the gnomon is aligned North-South Signup and view all the answers

What is the total distance covered by a car that moves at 40 km/h for 15 minutes and then at 60 km/h for the next 15 minutes?

25 km Signup and view all the answers

If two photographs taken at an interval of 10 seconds show a distance of 100 meters as 1 cm, what is the speed of the fastest car?

72 km/h Signup and view all the answers

Based on the distance-time graph in Fig. 9.15, which vehicle is moving faster?

Vehicle B Signup and view all the answers

Which distance-time graph represents a truck that is not moving at a constant speed?

(iii) Signup and view all the answers

What is the purpose of fixing a gnomon vertically along a diameter on a circular board when constructing a sundial?

To cast a shadow that can be used to tell time Signup and view all the answers

After constructing a sundial, why should you mark a line on the ground along the North-South direction?

To ensure that the shadow cast by the gnomon moves in a predictable way Signup and view all the answers

How do clocks and watches measure time?

Through the movement of a pendulum Signup and view all the answers

What is the time period of a pendulum?

The total time taken to complete one full cycle Signup and view all the answers

How did our ancestors tell time by looking at shadows?

By observing the length and direction of shadows Signup and view all the answers

What is necessary for constructing a sundial?

Knowledge of the sun's path and direction Signup and view all the answers

How can a sundial be used to track time?

By tracking the length of shadows at different times Signup and view all the answers

Why is measuring distances important in determining speed?

To find out how fast an object is moving Signup and view all the answers