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Physical World, Units & Dimensions Practice Questions - DPP for NEET

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FAQs on Physical World, Units & Dimensions Practice Questions - DPP for NEET

1. What are the fundamental units of measurement in the International System of Units (SI)?
Ans. The fundamental units of measurement in the SI system are the meter (m) for length, kilogram (kg) for mass, second (s) for time, ampere (A) for electric current, kelvin (K) for temperature, mole (mol) for amount of substance, and candela (cd) for luminous intensity.
2. How are derived units different from fundamental units?
Ans. Derived units are obtained by combining the fundamental units of measurement. They represent quantities that are derived from the fundamental quantities. For example, the unit of speed (m/s) is derived by dividing the unit of length (meter) by the unit of time (second).
3. What is the importance of dimensional analysis in physics?
Ans. Dimensional analysis is important in physics as it helps in converting between different units of measurement, verifying the correctness of equations, and identifying relationships between physical quantities. It allows us to check if the dimensions on both sides of an equation are consistent, ensuring the equation is valid.
4. How are prefixes used in the SI system?
Ans. Prefixes are used in the SI system to represent multiples or fractions of the base units. They help in expressing quantities that are either very large or very small. For example, kilo (k) represents a factor of 1000, milli (m) represents a factor of 0.001, and micro (μ) represents a factor of 0.000001.
5. Can units be manipulated algebraically in calculations?
Ans. Yes, units can be manipulated algebraically in calculations using the principles of dimensional analysis. In algebraic calculations, units can be treated as variables and canceled out or combined according to the rules of algebra. This allows for consistency and accuracy in the final result of a calculation.
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