We have different time zones because the Earth rotates on its axis, causing different parts of the world to experience daylight and nighttime at different times. Time zones were created to standardize time across regions, making it easier for us to manage schedules, especially for travel and international communication.
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MCQs
1. What causes the Earth to have time zones?
A) The Earth’s round shape
B) The Earth’s rotation around the sun
C) The movement of the moon
D) The Earth’s magnetic field
Answer: B) The Earth’s rotation around the sun.
Explanation: Time zones exist because the Earth rotates around its axis, exposing different parts of the Earth to the sun at different times, creating day and night cycles across the globe.
2. How many standard time zones are there in the world?
A) 12
B) 24
C) 36
D) 48
Answer: B) 24
Explanation: The world is divided into 24 standard time zones, corresponding to each hour of the day, as the Earth takes approximately 24 hours to complete one rotation.
3. Why can’t the whole world use the same time zone?
A) Because the world is too large
B) It would mean some people have midday in the middle of the night
C) It’s too confusing to have different time zones
D) Because of international laws
Answer: B) It would mean some people have midday in the middle of the night.
Explanation: If the whole world used the same time zone, it would not align with the natural cycle of daylight and darkness for many people, resulting in midday occurring during the night for some.
4. What is the purpose of daylight saving time?
A) To save energy
B) To make the day longer
C) To confuse people
D) To celebrate summer
Answer: A) To save energy.
Explanation: Daylight saving time is used in some parts of the world to make better use of daylight during the evenings, thereby saving energy by reducing the need for artificial lighting.
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