Q.1 What is day time and night time?
Q.2 In olden days, which instruments were used to tell time?
Q.3 How much time does the earth takes to rotate?
Q.4. On which day, would the sun appear at the highest point in the sky?
Q.5 The shadows in the early morning and evening were the longest while those at the noon were the shortest. Give Reason.
Q.6 Write the short note on Local Time.
*Q.7 What is the maximum number of local times that can there be in the world?
*Q.8 How many longitudes pa-ss the sun in one hour?
Q.9 What is Ante Meridiem and Post Meridiem?
Q.10 How standard time is used all over the country?
Q.11 Explain about the Universal Standard Time.
Answers
Q.1 What is daytime and night-time?
From sunrise to sunset it is daytime and from the sunset to the next sunrise night-time.
Q.2 In the olden days, which instruments were used to tell time?
Natural events and instruments like Ghatikapaatra (a bowl with a minute hole at its base which would float in a large water filled vessel); a sand timer, etc. were used to tell time.
Q.3 How much time does the earth takes to rotate?
The Earth takes 24 hours i.e. one day to complete one rotation. The Earth rotates from west to east.
Q.4. On which day, would the sun appear at the highest point in the sky?
On the north pole, on 21st June the sun would appear at the highest point in the sky. One the South Pole, approximately on 21st December, the sun appears at the highest point in the sky.
Q.5 The shadows in the early morning and evening were the longest while those at the noon were the shortest. Give Reason.
Because of the change in the apparent location of the sun in the sky, the length and direction of the shadow of the pole kept changing.
Q.6 Write the short note on Local Time.
The time of a place as decided by the location of the sun in the sky, is known as its local time.
*Q.7 What is the maximum number of local times that can there be in the world?
The maximum number of local times that can be there in the world is 360.
*Q.8 How many longitudes pαss the sun in one hour?
15 longitudes pαss the sun in one hour.
Q.9 What is Ante Meridiem and Post Meridiem?
When the sun is directly overhead at a place on the earth, it is noon over there. While telling the time between midnight and noon, we put a.m. in front of the time. This means Ante Meridiem. When the longitudes cross the noon-time, then the time is past midday or afternoon. The time between noon and midnight is denoted by p.m. means Post Meridiem.
Q.10 How standard time is used all over the country?
The local time at the longitude which generally passes through the middle of the country is deemed to be the standard time for that country. This standard time is used all over the country.
Q.11 Explain about the Universal Standard Time.
For an international coordination between countries, the local time at Greenwich (Greenwich Mean Time) in England is considered to be the international standard time. The difference in standard times of various countries is calculated with reference to GMT. The Indian Standard Time is 5 hours 30 minutes ahead of GMT. If it is 5 p.m. at Greenwich then in India it would be 10.30 p.m.
Q.1 What is daytime and night-time?
\red{\leadsto}⇝ From sunrise to sunset it is daytime and from the sunset to the next sunrise night-time.
Q.2 In the olden days, which instruments were used to tell time?
\red{\leadsto}⇝ Natural events and instruments like Ghatikapaatra (a bowl with a minute hole at its base which would float in a large water filled vessel); a sand timer, etc. were used to tell time.
Q.3 How much time does the earth takes to rotate?
\red{\leadsto}⇝ The Earth takes 24 hours i.e. one day to complete one rotation. The Earth rotates from west to east.
Q.4. On which day, would the sun appear at the highest point in the sky?
\red{\leadsto}⇝ On the north pole, on 21st June the sun would appear at the highest point in the sky. One the South Pole, approximately on 21st December, the sun appears at the highest point in the sky.
Q.5 The shadows in the early morning and evening were the longest while those at the noon were the shortest. Give Reason.
\red{\leadsto}⇝ Because of the change in the apparent location of the sun in the sky, the length and direction of the shadow of the pole kept changing.
Q.6 Write the short note on Local Time.
\red{\leadsto}⇝ The time of a place as decided by the location of the sun in the sky, is known as its local time.
*Q.7 What is the maximum number of local times that can there be in the world?
\red{\leadsto}⇝ The maximum number of local times that can be there in the world is 360.
*Q.8 How many longitudes pαss the sun in one hour?
\red{\leadsto}⇝ 15 longitudes pαss the sun in one hour.
Q.9 What is Ante Meridiem and Post Meridiem?
\red{\leadsto}⇝ When the sun is directly overhead at a place on the earth, it is noon over there. While telling the time between midnight and noon, we put a.m. in front of the time. This means Ante Meridiem. When the longitudes cross the noon-time, then the time is past midday or afternoon. The time between noon and midnight is denoted by p.m. means Post Meridiem.
Q.10 How standard time is used all over the country?
\red{\leadsto}⇝ The local time at the longitude which generally passes through the middle of the country is deemed to be the standard time for that country. This standard time is used all over the country.
Q.11 Explain about the Universal Standard Time.
\red{\leadsto}⇝ For an international coordination between countries, the local time at Greenwich (Greenwich Mean Time) in England is considered to be the international standard time. The difference in standard times of various countries is calculated with reference to GMT. The Indian Standard Time is 5 hours 30 minutes ahead of GMT. If it is 5 p.m. at Greenwich then in India it would be 10.30 p.m.
\sf{hope \; it \; helps :)}hopeithelps:)