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15.The universe has the ………. size. 15.largest
16.The unit slug is the unit of ……… . 16.mass

1. The SI unit is the modified form of …….. system. 17.MKS
2. A watch can be used to measure the ……… . 18.time
3. The mass of a boy is measured by a ……… . 19.balance
4. One metre is equal to …….km. 20.10-3
5. Elementary particles have the ……… size. 21.smallest
   22.The earth can be regarded as a ………. . 22.clock
   A quantity that has both magnitude and direction is called a ……… .
6. The thing that cause the body to move is called ……… .
7. The magnitude of resultant vector of two vectors have the same magnitude and opposite
   direction is ………. .
8. The ……… changes the state of motion of a body.
9. The new vectors obtained from sub-dividing a vector is called ……… .
10. Q ⃗ and - Q ⃗ are in ……… directions.