Order of magnitude of a physical quantity is the

Important Questions on Physical World and Measurement

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 30

The length and width of a rectangular room are measured to be $\left(3.95\pm 0.05\right)\mathrm{ }\mathrm{m}$ and $\left(3.05\pm 0.05\right)\mathrm{ }\mathrm{m}$ , respectively, the area of the floor is

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 31

In an experiment on a simple pendulum to determine the acceleration due to gravity, the student measures the length of the thread as $63.2 \mathrm{cm}$ and diameter of the pendulum bob as $2.256 \mathrm{cm}.$ The student should take the length of the pendulum to be

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 32

If one takes into account the finite mass of the proton, the correction to the binding energy of the hydrogen atom is approximately (mass of proton $=1.60\times {10}^{-27}\mathrm{kg},$ mass of an  electron $=9.10\times {10}^{-31}\mathrm{kg}$ )

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 33

The distance $s$ travelled by a particle in time $t$ is $s=ut-\frac{1}{2}g{t}^2$. The initial velocity of the particle was measured to be $u=\left(1.11\pm 0.01\right) \mathrm{m} {\mathrm{s}}^{-1}$ and the time interval of the experiment was $t=\left(1.01\pm 0.1\right) \mathrm{s}$. The acceleration was taken to be $g=\left(9.8\pm 0.1\right) \mathrm{m} {\mathrm{s}}^{-2}$. With these measurements, the student estimates the total distance travelled. How should the student report the result?

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 34

The dimensions of a rectangular block measured with a vernier calipers having least count of $0.1 \mathrm{mm}$ is $5 \mathrm{mm} \times 10 \mathrm{mm} \times 5 \mathrm{mm}$. The maximum percentage error in measurement of volume of the block is

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 35

An experiment measures quantities $x\mathit{,}\mathit{ }y\mathit{,}\mathit{ }z$ and then $t$ is calculated from the data as $t=\frac{x{y}^2}{z^3}$. If percentage errors in $x\mathit{,}\mathit{ }y$ and $z$ are respectively $1\%, 3\%, 2\%$, then percentage error in $t$ is:

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 36

The edge of a cube is $a=1.2\times {10}^{-2} \mathrm{m}.$ Then its volume will be recorded as

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 37

The pressure on a square plate is calculated by measuring the force on the plate and the length of the sides of the plate. If the maximum error in the measurement of force and length are $4\%$ and $2\%$, respectively, then the maximum error in the measurement of pressure is