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प्रश्न
Tick the most appropriate answer.
The total number of divisions in the Celsius scale is
पर्याय
90
100
180
360
उत्तर
100
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संबंधित प्रश्न
The basic unit of speed is ______.
Tick the most appropriate answer.
A train departs from Delhi railway station at 21:50 hours every day. The time shown in your analog watch at the departure will be
Fill in the blank.
The first two digits in a 24-hour time format represent the number of ............
A speedometer is a device used for indicating distance travelled by an automobile.
The national physical laboratory is located in Delhi.
What is the clock used to measure the time accurately?
Which of the following cannot be used for the measurement of time?
Plot a distance-time graph of the tip of the second hand of a clock by selecting 4 points on the x-axis and y-axis respectively. The circumference of the circle traced by the second hand is 64 cm.
You can make your own sundial and use it to mark the time of the day at your place. First of all, find the latitude of your city with the help of an atlas. Cut out a triangular piece of cardboard such that its one angle is equal to the latitude of your place and the angle opposite to it is a right angle. Fix this piece, called gnomon, vertically along a diameter of a circular board a shown in Figure One way to fix the gnomon could be to make a groove along a diameter on the circular board.
Next, select an open space, which receives sunlight for most of the day. Mark a line on the ground along the North-South direction. Place the sundial in the sun as shown in Figure Mark the position of the tip of the shadow of the gnomon on the circular board as early in the day as possible, say 8:00 AM. Mark the position of the tip of the shadow every hour throughout the day. Draw lines to connect each point marked by you with the centre of the base of the gnomon as shown in Figure Extend the lines on the circular board up to its periphery. You can use this sundial to read the time of the day at your place. Remember that the gnomon should always be placed in the North-South direction as shown in Figure.
Collect information about time-measuring devices that were used in the ancient times in different parts of the world. Prepare a brief write up on each one of them. The write up may include the name of the device, the place of its origin, the period when it was used, the unit in which the time was measured by it and a drawing or a photograph of the device, if available.
