Chemistry - 9 Chapter - 1Chemistry an Introduction Test - 12

Chemistry - 9 Chapter - 1
Chemistry an Introduction Test - 12

1. The western scientists think that universe?

a) Came into being on its own
b) Is created almighty Allah
c) Is created by an idol
d) Is imaginary

2. A hypothesis is tested by?

a) Observation
b) Comparison with scientific laws
c) Experiment
d) Comparison with other theories

3. Inferences are deduced?

a) By thoughtful considerations
b) By coordinating with the previous information
c) Through collection of information
d) By all three factors mentioned above

4. Why has science been divided into different disciplines? ..................................... ( Such questions are in fact Short Answer Questions. You are required to make a choice between a correct and a wrong short answer. There is a change of only one odd word. You should remember these by heart.)

a) Scientific knowledge is very limited which nobody can understand as a whole. For easy understanding and specialization it divided into various groups like chemistry , physics, biology(botany and zoology), geology and astronomy.
b) Scientific knowledge is very vast which nobody can understand as a whole. For easy understanding and specialization it divided into various groups like chemistry , physics, biology(botany and zoology), geology and astronomy.

5. What is meant by cyclic process?
a) Cyclic process means one thing happening after the other and same thing happening again.
b) Cyclic process means one thing happening after the other and same thing never happening again.

6. Hypothesis is a _______ solution of a problem which may be correct or may prove to be wrong subsequently. Each hypothesis is formed through very keen observation of various scattered facts.
a) tentative
b) Proven
c) Final

7. Differentiate between a law and a theory?

a) Stage wise first of all a hypothesis is formed then experiments are carried out. If experiment support hypothesis a theory is formulated. After this different scientists discuss the theory and carry out experiments. If same results are obtained it becomes a law.
b) Stage wise first of all a hypothesis is formed then predictions are carried out. If predictins support hypothesis a theory is formulated. After this different scientists discuss the theory and carry out experiments. If same results are obtained it becomes a law.

8. A law is a prior stage than theory.

a) True
b) False

9. A law is universally accepted and cannot be changed easily.

a) False
b) True

10. A theory cannot be changed easily even if it gives different results.

a) True
b) False

This is more feedback!

This is the feedback!