Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 24

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The dimensional formula for Planck’s constant $h$ and gravitational constant $G$ respectively are :-

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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 25

If

E, M, L

and

G

denote energy, mass, angular momentum and Gravitational constant respectively, then quantity

E^{2} L^{2} / M^{5} G^{2}

has dimensions of :

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 26

The dimensions of the quantity

\vec{E} \times \vec{B}

, where

\vec{E}

represents the electric field and

\vec{B}

the magnetic field may be given as :-

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 28

A physical quantity

ε

is calculated by using the formula

ε = \frac{{xy}^{2}}{10 z^{1 / 3}}

where

x, y

and

z

are experimentally measured quantities. If the fractional percentage error in the measurements of

x, y

and

z

are

2 %

,

1 %

and

3 %

respectively, then the fractional percentage error will be :-

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 29

A 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-

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 30

In a vernier callipers, one main scale division is

x c m

and

n

divisions of the vernier scale coincide with

(n - 1)

divisions of the main scale. The least count

(i n c m)

of the callipers is

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 31

Choose the incorrect statement out of the following :-

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 40

The moon's distance from the earth is

360000 km

and its diameter subtends an angle of

42^{'}

at the eye of the observer. The diameter of the moon is

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Beta Question Bank for Medical: Physics>Chapter 3 - Physical World and Measurement>Exercise (Assertion & Reason)>Q 42

Which of the following units denotes the dimensions

[\frac{M L^{2}}{Q^{2}}]

, where

Q

denotes the electric charge?