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The density of a material in SI units is $128 kg m^{- 3}$ . In certain units in which the unit of length is $25 cm$ and the unit of mass is $50 g$ , the numerical value of density of the material is

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Important Questions on Physical World and Measurement

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 10

If speed

(V)

, acceleration

(A)

and force

(F)

are considered as fundamental units, the dimension of Young's modulus will be,

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 11

Let

l, r, c,

and

v

represent inductance, resistance, capacitance and voltage, respectively. The dimension of

\frac{l}{r c v}

in SI units will be

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 13

A physical quantity of the dimensions of length that can be formed out of

c

G

and

\frac{e^{2}}{4 π e_{0}}

is [

c

is the velocity of light,

G

is the universal constant of gravitation and

e

is charge] :

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 14

If dimensions of critical velocity,

v_{c}

of a liquid flowing through a tube are expressed as

[η^{x} ρ^{y} r^{z}]

, where,

η, ρ

and

r

are the coefficient of viscosity of liquid, density of liquid and radius of the tube, respectively, then, the values of

x

y

and

z

are given by

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 15

A student measures the distance traversed in free fall of a body, initially at rest in a given time. He uses this data to estimate

g

, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are

e_{1}

and

e_{2}

, respectively, the percentage error in the estimation of

g

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 16

In an experiment, the percentage of error occurred in the measurement of physical quantities

A, B, C

and

D

are 1%, 2%, 3% and 4%, respectively. Then the maximum percentage of error in the measurement

X

, where

X = \frac{A^{2} B^{\frac{1}{2}}}{C^{\frac{1}{3}} D^{3}}

will be

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 17

The respective number of significant figures for the numbers

23.023, 0.0003, 21 \times 10^{- 3}

are

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Alpha Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise-3>Q 18

The period of oscillation of a simple pendulum is

T = 2 π \sqrt{L / g} .

Measured value of

L = 20.0 cm

known to

1 mm

accuracy and time for

100

oscillations of the pendulum is found to

90 s

using a wrist watch of

1 s

resolution. The accuracy in the determination of

g

is :

The density of a material in SI units is 128 kg m−3. In certain units in which the unit of length is 25 cm and the unit of mass is 50 g, the numerical value of density of the material is

Important Questions on Physical World and Measurement

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The density of a material in SI units is $128 kg m^{- 3}$ . In certain units in which the unit of length is $25 cm$ and the unit of mass is $50 g$ , the numerical value of density of the material is