Q.V. Answer the following the questions
1. Name any two effects of electric current
2. Define the term average speed.
3. A simple pendulum takes 32 seconds to complete 20 oscillations
what is the time period of the pendulum?
4. Name three instruments used to measure time in ancient days.
5. Which are the two types of lenses? Describe.
Answers
Answer:
Name any two effects of electric current
2. Define the term average speed.
3. A simple pendulum takes 32 seconds to complete 20 oscillations
what is the time period of the pendulum?
4. Name three instruments used to measure time in ancient days.
5. Which are the two types
Answer:
(1) Answer: The two effects of electric current are; heating effect and magnetic effect. Question 6: When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position.
(2) The average speed of a body in a certain time interval is the distance covered by the body in that time interval divided by time.
(3) A simple pendulum takes 32s to complete 20 oscillations, what is the time period of the pendulum? Hint: Time period of a pendulum is time taken by it to complete 1 oscillation. Hence, the time period of the pendulum is 1.6 seconds.
(4) The important time measuring devices used in ancient times were : Sundial, Sand clock and Water clock.
(5) There are two main types of lenses, known as convex (or converging) and concave (or diverging)