science
Grade-9
Easy
Question
________ are explanations of observations that are supported by reliable evidence.
- Laws
- Theories
- Matter
- All of the above
Hint:
The set of observations and data combined with shreds of evidence provide a valuable hypothesis.
The correct answer is: Theories
- Theories are the explanations of observations that are supported by reliable evidence.
- A scientific theory is considered the scientific truth which is usually supported by shades of evidence collected from different scientists.
- A theory is a formal explanation that is attached to a large number of observations. Evidence is known to support the theory to clearly explain its structure and work. Theories can be accepted or rejected based on evaluations.
To become a theory, a hypothesis needs to be tested a good number of times.
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All matter is made of small particles called
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The velocity-time graph drawn by Mona turned out to be a straight line parallel to the x-axis. Which of the following is true about the body’s motion?
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c. The body made a non-zero displacement
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The total displacement of the body is ____ m.
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The following data table represents which kind of motion?
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The v-t graph of a moving body is a straight line with a non-zero slope. Which of the following cannot be true about the motion of the body?
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The slope of the v-t graph of a moving body is constant and negative everywhere. The body is most likely to be in ____.
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The acceleration of section B is ____.
The acceleration of section B is ____.
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a. It is in a uniform motion
b.Its velocity is constant
c. Its velocity increases by equal amounts in equal intervals of time.
d. Its velocity decreases by equal amounts in equal intervals of time.
The v-t graph of a body is a straight line with a positive slope. Which of the following is true about the body’s motion?
a. It is in a uniform motion
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The displacement of section B is ____ m.
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The graph of the following data will be a _____.
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