Physics and Measurement-Dimensions of Physical Quantities (NEET Physics): Questions 7 - 10 of 16

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Question number: 7

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

If the time period (T) of vibration of a liquid drop depends on surface tension (S), radius (r) of the drop and density (ρ) of the liquid, then the expression of T is

Choices

Choice (4) Response
a.

T = k

ρr3/S1/2

b.

T = k

ρr3/S

c.

T = k

ρ1/2r3/S

d. None of the above

Question number: 8

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

The frequency of vibration of string is given by v = P2l [Fm] 1/2 Here P is number of segments in the string and l is the length. The dimensional formula for m will be

Choices

Choice (4) Response
a.

[M L 0 T -1]

b.

[M L -1 T 0]

c.

[M 0 L T -1]

d.

[M 0 L 0 T 0]

Question number: 9

» Physics and Measurement » Dimensions of Physical Quantities

Assertion-Reason▾

Assertion (Ꭺ)

The time period of a pendulum is given by the formula, T = 2π lg

Reason (Ꭱ)

According to the principle of homogeneity of dimensions, only that formula is correct in which the dimensions of L. H. S. is equal to dimensions of R. H. S.

Choices

Choice (4) Response
a. Ꭺ is true but Ꭱ is false
b. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
d. Ꭺ is false but Ꭱ is true

Question number: 10

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

P represents radiation pressure, c represents speed of light and S represents radiation energy striking unit area per sec. The non-zero integers x, y, z such that P x S y c z is dimensionless are

Choices

Choice (4) Response
a.

x = 1

b.

y = 1

c.

z = 1

d.

x=-1

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