1. What are obelisks?
2. Define an oscillation.
3. Where is quartz found?
4. What are the two methods of writing time in a day
5. Name the SI unit of time.
6. What is motion?
7. List the types of motion.
8. What does a speedometer measure?

Dear Student
2) To and fro motion of an object in regular rhythm is called oscillation.
5) Second is SI unit of time.
7) Uniform motion (constant speed) and non-uniform motion (Changing motion along straight line) are two types of motion.
8) It records speed in km/hr.
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Hope this information will clear your doubts about topic.
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An obelisk  is a tall, four-sided, narrow tapering monument which ends in a pyramid-like shape or pyramidion at the top. These were originally called tekhenu by their builders, the Ancient Egyptians. The Greeks who saw them used the Greek term 'obeliskos' to describe them, and this word passed into Latin and ultimately English.[4] Ancient obelisks are monolithic; that is, they consist of a single stone. Most modern obelisks are made of several stones; some, like the Washington Monument, are buildings.
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nice answer
 
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