Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 13

EASY

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IMPORTANT

Earn 100

A student measuring the diameter of a pencil of circular cross-section with the help of a vernier scale records the following four readings $5.50 mm$ , $5.55 mm$ , $5.34 mm$ , $5.65 mm$ . The average of these four reading is $5.5375 mm$ and the standard deviation of the data is $0.07395 mm$ . The average diameter of the pencil should therefore be recorded as :

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Important Questions on Physical World and Measurement

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 14

A physical quantity z depends on four observables

a, b, c

and

d

, as

z = \frac{a^{2} b^{\frac{2}{3}}}{\sqrt{c} d^{3}} .

The percentage of error in the measurement of

a, b, c

and

d

are

2 %, 1.5 %, 4 %

and

2.5 %

respectively. The percentage of error in

z

is :

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 15

A cylindrical wire has a mass

(0.3 \pm 0.003) g

, radius

(0.5 \pm 0.005) mm

and length

(6 \pm 0.06) cm

. The maximum percentage error in the measurement of its density is

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 16

The resistance

R = \frac{V}{I}

where,

V = (100 \pm 5) V

and

I = (10 \pm 0.2) A .

The percentage error in

R

is:

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 17

In the experiment of Ohm's law, a potential difference of

5.0 V

is applied across the end of a conductor of length

10.0 cm

and diameter of

5.00 mm .

The measured current in the conductor is

2.00 A .

The maximum permissible percentage error in the resistivity of the conductor is :-

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 18

An accurate measurement implies that

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 19

Which of the following measurements is most precise?

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 20

The order of magnitude of Number

11

is

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 2 - Physical World and Measurement>Exercise 1>Q 21

The number of significant figures in

0.700 m^{2}

are