Question

How does a Sundial work?
A. The changing position of the moon in the sky casts a shadow at different places marked on the sundial which tells the time of the day.
B. The changing position of sun in the sky casts a shadow at different places marked on the sundial which tells the time of the day.
C. The changing position of sun in the sky cast a shadow at different places marked on the sundial which tells the time of the day.
D. None of the above

Answer 1

Hint:The above problem can be resolved using the concepts and the fundamentals of the sundial. The sundial is used for the purpose to determine the time, especially in primitive areas, where there is no availability of clocks and watches. Moreover, this device utilises the position of the shadow and the position of the sun to create such determination.

Complete step by step answer:
The sundial is an instrument that is used to determine the change of time utilizing the changing position of the shadow of a rod, being used in the instrument. In this device, a thin rod is utilized for creating a shadow, as the sun changes its position from day to evening, the position of shadow also gets changed. From this observation, the time is determined.
Therefore, the sundial works by changing the position of the sun in the sky, casts a shadow at different places marked on the sundial, which tells the time of the day and option (B) is correct.

Note: Try to understand the concept and working of the sundial. The sundial is one of a unique instrument that is used to determine the time and is used mostly in areas, where there is the utility of modern clocks and watches. The sundial works on the principle of changing the position of the shadow, utilising the orientation of the sun, at day. Moreover, it is generally used by the direction predictors, to measure the length of the day.