Measurement of Time
The duration between any two events is called time. The SI unit of time is second. This note provides an information about the measurement of time.
Summary
The duration between any two events is called time. The SI unit of time is second. This note provides an information about the measurement of time.
Things to Remember
- The duration between any two events is called time.
- The SI unit of time is second.
- One standard second is defined as the time taken by cesium -133 atom to make 9192631770 vibrations.
- One second is defined as the 1/86,400 th part of the mean solar day. A particular point in the space is called zenith.
- A solar day is defined as the time interval between the consecutive passages of the sun through the zenith.
- The time taken by the earth to revolve once around the sun is called one year.
MCQs
No MCQs found.
Subjective Questions
Q1:
Welfare Club provides you the following opening balance sheet and receipts and payments account for the year ending 31st Ashadh 2065.
Balance sheet
As on 31st Ashad 2064
|
Liabilities |
Amount |
Assets |
Amount |
|
Capital fund |
22,000 |
Premises |
15,000 |
|
Advance subscription |
2,000 |
Stock of food materials |
2,000 |
|
12% loan |
8,000 |
Bank |
15,000 |
|
|
32,000 |
|
32,000 |
Receipts and Payments account for 31st Ashad 2065
|
Receipts |
Amount |
Payments |
Amount |
|
To balance b/d |
15000 |
By office expenses |
3000 |
|
To subscription |
10,000 |
By purchase of food material |
1,000 |
|
To legacies |
6,000 |
By 12% loan (31-12-2065) |
8,000 |
|
To sundry income |
1,000 |
By general expenses |
4,000 |
|
|
|
By balance c/d |
16,000 |
|
|
32,000 |
|
32,000 |
Additional information:
Outstanding office expenses Rs.900 and audit fees Rs.300
Subscription due for current year Rs.500
Depreciate on premises by 4%
Interest on loan is unpaid.
Closing stock of food material Rs.220
Required:
Income and expenditure account
Balance sheet
Type: Short Difficulty: Easy
Q2:
What is receipt and payment account?
Type: Very_short Difficulty: Easy
Q3:
What are the features of receipts and payments account?
Type: Very_short Difficulty: Easy
Q4:
What are the limitations of receipts and payments account?
Type: Very_short Difficulty: Easy
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Receipts & Payments account
Receipts and Payments Account
Receipts and Payments Account
Measurement of Time
Measurement of time
Fig: Clock
The duration between any two events is called time. The SI unit of time is second. In a pendulum clock, the oscillation is made for the measurement of time. One second is defined as the 1/86,400 th part of the mean solar day. A particular point in the space is called zenith. A solar day is defined as the time interval between the consecutive passages of the sun through the zenith.
The time taken by the earth to revolve once around the sun is called one year. Large distances such as the distance between the earth and the moon etc. are measured in the light year. It is the distance travelled by light in one year.
We have,
1 year = 365 days = 365 × 24 h = 365 × 24 × 3600 s = 31,536,000 s
Since the speed of the light in air or vacuum is 3× 108m/s
And distance travelled = speed × time
Therefore, 1 light year = 3 ×108× 31,536,000 s
= 9.4608 × 1015m
One standard second is defined as the time taken by cesium -133 atom to make 9192631770 vibrations. The watch based on such vibrations is called an atomic watch. Scientists use an atomic clock for the measurement of time.In quartz, watch time is measured by the oscillation of the pendulum and in an electronic watch, time is measured by frequency of alternating current. Automatic watch or mechanical watch may gain or lose time by few seconds or minutes in a day
Activity
You must have a clock in your home. Set the time of your clock according to the time of the news program of the radio. Then observe the time of your clock and news program of the radio after 1 month. What do you observe? Discuss with your friends and with your teachers.
Lesson
Units and Measurement
Subject
Science
Grade
Grade 8
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