Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 46

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If the buoyant force $F$ acting on an object depends on its volume $V$ immersed in a liquid, the density $ρ$ of the liquid and the acceleration due to gravity $g$ . The correct expression for $F$ can be

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Important Questions on Units and Measurements

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 47

The potential energy

u

of a particle varies with distance

x

from a fixed origin as

u = \frac{A \sqrt{x}}{x + B}

, where

A

and

B

are constants. The dimensions of

A

and

B

are respectively

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 48

A physical quantity

P

is given by the relation.

P = P_{0} e^{(- α t^{2})}

If

t

denotes the time, the dimensions of constant

α

are

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 49

The dimensions of potential energy of an object in mass, length and time are respectively

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 50

The amount of heat energy

Q

, used to heat up a substance depends on its mass

m

, its specific heat capacity

(s)

and the change in temperature

Δ T

of the substance. Using dimensional method, find the expression for

s

is ( Given that

[s] = [L^{2} T^{- 2} K^{- 1}])

is

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 1

The source of instrumental error is

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 2

For two resistors

R_{1}

and

R_{2}

, connected in parallel, the relative error in their equivalent resistance is

(

Where

R_{1} = (10.0 \pm 0.1) Ω

and

R_{2} = (20.0 \pm 0.4) Ω)

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 3

The true value of a particular mass is

8.5 g

. The four instruments

A, B, C, D

used to measure mass gives the reading as

8.2 g, 8.48 g, 8.186 g, 8 g

respectively. Which of these instruments is more accurate?

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>Assignment>Q 4

Which is a supplementary unit?