18 Questions
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
Why should the gnomon always be placed in the North-South direction on a sundial?
To ensure accurate time measurement
In constructing a sundial, why is it important to connect each shadow point with the centre of the base of the gnomon?
To indicate the hours
What is the primary function of a sundial?
Measure time of day
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
What is one key element in using a sundial to track time effectively?
Making sure the gnomon is aligned North-South
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
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
Based on the distance-time graph in Fig. 9.15, which vehicle is moving faster?
Vehicle B
Which distance-time graph represents a truck that is not moving at a constant speed?
(iii)
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
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
How do clocks and watches measure time?
Through the movement of a pendulum
What is the time period of a pendulum?
The total time taken to complete one full cycle
How did our ancestors tell time by looking at shadows?
By observing the length and direction of shadows
What is necessary for constructing a sundial?
Knowledge of the sun's path and direction
How can a sundial be used to track time?
By tracking the length of shadows at different times
Why is measuring distances important in determining speed?
To find out how fast an object is moving
Learn how to construct and use a sundial for timekeeping purposes. This quiz guides you through the steps of placing the sundial, marking the shadow's position, and reading time from it throughout the day.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
