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SEBA Class 7 Social Science Chapter 1 Calculation of Time on Earth
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Calculation of Time on Earth
| Part – 1: Geography |
| Exercise |
1. Answer in brief-
(a) What is the total number of the longitude on earth at 1º interval?
Ans: The total number of longitudes on the earth at 1° interval is 360.
(b) What is the longitude of Indian Standard Time? (IST)
Ans: The longitude of Indian Standard Time (IST) is 82°30′ E.
(c) How many hours does the earth need to make a complete rotation of 360°?
Ans: The earth takes 24 hours to complete one rotation of 360°.
(d) What is the value in 0º of the prime meridians passing through Greenwich?
Ans: The value of the Prime Meridian passing through Greenwich is 0°.
(e) What is the unit of angular distance?
Ans: The unit of angular distance is degree (°).
2. Fill in the blanks:
(a) The circumference of the earth makes an angle of _______ at its centre.
Ans: The circumference of the earth makes an angle of 360° at its centre.
(b) The measurement of the line of longitude is called __________.
Ans: The measurement of the line of longitude is called longitude.
(c) The angular distance of the Prime Meridian is _________longitude.
Ans: The angular distance of the Prime Meridian is 0° longitude.
(d) If a place remains away by 15°E from the mid-day sun, then the time at that place will be __________ hrs.
Ans: If a place remains away by 15°E from the mid-day sun, then the time at that place will be 1 hour.
3. Say whether the following statements are true or false:
(a) As a result of the diurnal motion of the earth, the western places face the sun earlier than the places in the eastern side.
Ans: False.
(b) The travellers at the moment of crossing 180° from the east have to add up a day in their time schedule.
Ans: False.
(c) When it is 12 mid-night in any place on earth it indicates the end of a day and beginning of another day.
Ans: True.
(d) The time difference at 180º longitude is 12 hrs.
Ans: True.
(e) A place where evening occurs lately than in Greenwich is located in west longitude.
Ans: True.
4. Choose the correct answers:
(a) A traveller will have the feeling of loss/ gain in his time, if he moves to the west of Greenwich as per the GMT.
Ans: Gain.
(b) Mumbai has early sunrise than Greenwich therefore Mumbai is located at the east/west longitude.
Ans: East longitude.
(c) Time in each longitude to the east of the Prime Meridian goes ahead/back by four minutes.
Ans: Goes ahead.
(d) The east longitude of 83°20′/90/82°30′ is accepted as the Indian Standard longitude.
Ans: 82°30′.
(e) The common watch that we wear runs according to the local time Greenwich Mean Time/ Indian Standard Time.
Ans: Indian Standard Time.
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