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15.The universe has the ………. size. 15.largest
16.The unit slug is the unit of ……… . 16.mass
17. The SI unit is the modified form of …….. system. 17.MKS
18. A watch can be used to measure the ……… . 18.time
19. The mass of a boy is measured by a ……… . 19.balance
20. One metre is equal to …….km. 20.10-3
21. 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 ……… .
2. The thing that cause the body to move is called ……… .
3. The magnitude of resultant vector of two vectors have the same magnitude and opposite
direction is ………. .
4. The ……… changes the state of motion of a body.
5. The new vectors obtained from sub-dividing a vector is called ……… .
6. Q ⃗ and - Q ⃗ are in ……… directions.