NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-I>Q 2.8

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You measures two quantities as $A = (1.0 \pm 0.2) m, B = 2.0 m \pm 0.2 m$ . we report correct value of $\sqrt{A B}$ as:

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Important Questions on Units and Measurement

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11th CBSE

IMPORTANT

NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-I>Q 2.9

Which of the following measurement is most precise?

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-I>Q 2.10

The mean length of an object is

5 cm

. Which of the following measurement is most accurate?

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-I>Q 2.11

Young's modulus of steel is

1.9 \times 10^{11} N / m^{2}

. When expressed in CGS units of

d y n e / c m^{2}

. It will be equal to

(1 N = 10^{5} d y n e s, a n d 1 m^{2} = 10^{4} c m^{2})

.

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-I>Q 2.12

If the momentum

(P)

, area

(A)

and time

(T)

are taken to be fundamental quantities, then energy has dimensional formula.

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-II>Q 2.13

On the basis of dimensions, decide which of the following relations for the displacement of particle undergoing simple harmonic motion is not correct.

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-II>Q 2.14

P, Q, R

are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-II>Q 2.15

Photon is quantum of radiation with energy

E = hv,

where

v

is frequency and

h

is Planck's constant .The dimensions of h are the same as that of:

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NCERT Exemplar Physics - Class 11>Chapter 2 - Units and Measurement>MCQ-II>Q 2.16

If the Planck's constant

(h)

and the speed of light in vacuum

(c)

are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three choosen fundamental quantities.