Measurement of Time
Measurement of Time
Measurement of Time: In the beginning, people used calendars to keep a track of years, which were divided into months and days.
· Later, people started keeping track of the time of the day. They started building various instruments to divide the day into smaller parts.
· An instrument used to measure time is called a clock.
· People used instruments such as sundials and hourglass to keep track of time. The movement of the shadow changed direction with the movement of the sun across the sky, was used to make crude sundials.
· An hourglass consisted of two rounded glass bulbs connected by a narrow neck of glass. The top bulb was filled with sand and a measured amount of sand particles streamed down from the top bulb into the bottom bulb, giving the time.
· An instrument known as water clock was also used in different parts of the world. It worked on the principle of regulated flow of water.
60 second | 1 minute |
60 minute | 1 hour |
24 hours | 1 day |
3651/4 days | 1 year |
10 years | 1 decade |
10 decades | 1 century |
10 centuries | 1 millennium |
· These devices were not very accurate and there was a need to improve accuracy. A major breakthrough came in 1656, when Christiana Huygens made the first pendulum clock. It consisted of weight and a swinging pendulum.
· Another major advancement in timekeeping was the invention of the atomic clock, which is very accurate.
· Today, clocks do not just tell us the time of the day; they are also used as timers in ovens, in stopwatches, in various athletic events, etc. the SI unit of time is the second.
Select the unit of length that is used to measure the distance of stars from the earth ? | |||
| Right Option : C | |||
| View Explanation |
In the S.I. system of units the unit of length is | |||
| Right Option : A | |||
| View Explanation |
Which among the following is the smallest unit of length? | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [10]
About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thI have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
Yatharthi Sharma
10thBeing a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
Prisha Gupta
8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Cheshta
10thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thMy experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
