For all science experts?

Question

Do I have these right?

1 Power is the measure of the amount of time in which work is done? T

2 A liquid is a substance which has a definite volume but no definte shape? T

3 The bond formed when ions of opposite charges are attracted to each other is called a covalent bond. F correct ans ionic bond

4 In human beings, energy release involves thaking in food and chemically changing it by the process of oxidation? T

5 Spiral-shaped DNA molecules unwind during the process of replication T

7 The currents produced when water is heated are an example of the transfer of energy by: a) conduction b) convection c)radiation d) insulation. Ans B

8 In actual use a machine does: a) no work b) the same amount of work as is put into it c) more work than the amount of work put into it d) less work than the amount of work put into it. Ans. D

9 A broom is an example of what kind of simple machine? a)wedge b) an inclined plane c) a lever d) an axle Ans. C

Answer 1

your answers are right

Answer 2

>1 Power is the measure of the amount of time in which work is done? T

False, it's the work per unit time. If ten minutes were the time above, the amount of work could be higher or lower, meaning different power.

2 A liquid is a substance which has a definite volume but no definte shape? T

Yes

3 The bond formed when ions of opposite charges are attracted to each other is called a covalent bond. F correct ans ionic bond

Good.


4 In human beings, energy release involves thaking in food and chemically changing it by the process of oxidation? T

True


5 Spiral-shaped DNA molecules unwind during the process of replication T

I can't answer - I'm not familiar with the term Replication T

7 The currents produced when water is heated are an example of the transfer of energy by: a) conduction b) convection c)radiation d) insulation. Ans B

Good

8 In actual use a machine does: a) no work b) the same amount of work as is put into it c) more work than the amount of work put into it d) less work than the amount of work put into it. Ans. D

True, nothing has perfect energy transfer

9 A broom is an example of what kind of simple machine? a)wedge b) an inclined plane c) a lever d) an axle Ans. C

yep