Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 9

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Planck's constant $(h)$ , speed of light in vacuum $(c)$ and Newton's gravitational constant $(G)$ are three fundamental constants. Which of the following combinations of these has the dimension of length?

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Important Questions on Physical World and Measurement

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 10

Find dimension formula of polarisation ?

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 11

Dimensional formula of magnetic field is :-

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 12

A physical quantity of the dimensions of length that can be formed out of $c, G$ and $\frac{e^{2}}{4 π ε_{0}}$ is $[c$ is velocity of light, $G$ is universal constant of gravitation and $e$ is charge $]$

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 13

In a particular system, the units of length, mass and time are chosen to be

10 cm, 10 g

and

0.1 s

, respectively. The unit of force in this system will be equal to

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 14

Bernoulli’s equation is given by

p + \frac{1}{2} {ρv}^{2} + hρg = k

Where

p =

pressure,

ρ =

density,

v =

speed,

h =

height of the liquid column,

g =

acceleration due to gravity and

k

is constant. The dimensional formula for

k

is same as that for :

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 15

The period of oscillation of a simple pendulum in the experiment is recorded as

2.63 s

,

2.56 s

,

2.42 s

,

2.71 s

and

2.80 s

, respectively. The average absolute error is

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 16

The length, breadth and thickness of a strip are

(10 .0 \pm 0 .1) cm

,

(1 .00 \pm 0 .01) cm

and

(0 .100 \pm 0 .001) cm

, respectively, then the most probable error in its volume will be

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 17

The length of a cylinder is measured with a meter rod having least count

0.1 cm

. Its diameter is measured with vernier calipers having least count

0.01 cm

. If the length and diameter of the cylinder are

5.0 cm

and

2.0 cm

, respectively, then the percentage error in the calculated value of volume will be