II: TRUE or FALSE.
______21. In convection current, warm air rises ,cold air sinks.
______22. Unlike charges repel, like charges attract.
______23. Conduction and convection need vacuum for heat to transfer.
______24. An object becomes charged when it gains protons.
______25. When an object loses electrons, it becomes positively charged.
Answers & Comments
Answer:
1.TRUE
2.TRUE
3.FALSE
4.FALSE
5.TRUE
Explanation:
Explanation:
21. true
22.true
true
yrue
truue
true
true
23.
24.
25.