4. A scientific theory is an explanation that tells how and why certain things happen. A scientific theory is a carefully thought out explanation that is based on scientific experiments. It is an amalgamation of facts and hypotheses.
The theories are the most probable explanation of certain events and thus, can be changed and modified based on the evidences collected via observations and scientific experiments.
Both the options a and c are correct. Hence, the correct answer is option d.
5. The units are said to be derived units when they are derived from the seven fundamental units. Among the given options, meter (m), candela (cd), and hertz are the SI units of height, luminous intensity, and frequency while Coulomb (C) is a derived unit of charge.
The correct answer is option b.
6. Conversion factor can be defined as the number which are utilized to change the one set units into another. 1 meter = 100 cm
1 km = 1000m
1 Tbyte = 1Khz
The correct answer is option d.
7. The given arithmetic operation can be solved as follows:
6.201 + 7.4 + 0.68 + 12.0 = 26.281 cm
The correct answer is option a.
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