Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 28

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An experiment measures quantities $a, b$ and $c$ , and quantity $X$ is calculated from $X = \frac{a b^{2}}{c^{3}}$ . If the percentage errors in $a, b$ and $c$ are $\pm 1 %, \pm 3 %$ and $\pm 2 %$ , respectively, then the percentage error in $X$ will be

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Important Questions on Physical World and Measurement

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Physics Crash Course NEET>Chapter 1 - Physical World and Measurement>Level 2>Q 29

Order of magnitude of a physical quantity is the

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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

(3 .95 \pm 0 .05) m

and

(3 .05 \pm 0 .05) 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 cm

and diameter of the pendulum bob as

2.256 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} kg,

mass of an electron

= 9 .10 \times 10^{- 31} 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 = u t - \frac{1}{2} g t^{2}

. The initial velocity of the particle was measured to be

u = (1.11 \pm 0.01) m s^{- 1}

and the time interval of the experiment was

t = (1.01 \pm 0.1) s

. The acceleration was taken to be

g = (9.8 \pm 0.1) m 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 mm

is

5 mm \times 10 mm \times 5 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, y, z

and then

t

is calculated from the data as

t = \frac{x y^{2}}{z^{3}}

. If percentage errors in

x, 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} m .

Then its volume will be recorded as