Available Answers

1. 1.

   What is a standard unit?

2. 2.

   What are the SI units of mass, length and time?

3. 3.

   What discovery made by Galileo helped in the invention of the pendulum clock?

4. 4.

   Earlier, people used parts of the body to measure length. Why is this not an accurate way of making measurements?

5. 5.

   What is a beam balance?

6. 6.

   What is a pendulum?