Physics and Measurement-Dimensions of Physical Quantities (NEET Physics): Questions 11 - 15 of 16

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Question number: 11

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

A small steel ball of radius r is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity η. After some time the velocity of the ball attains a constant value known as terminal velocity vT The terminal velocity depends on (i) the mass of the ball m, (ii) n, (iii) r and (iv) acceleration due to gravity g. Which of the following relations is dimensionally correct?

Choices

Choice (4) Response

a.

vT mgηr

b.

vT ηrmg

c.

vT rmg

d.

vT mgrη

Question number: 12

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

What are the dimensions of permeability (µ 0) of vacuum?

Choices

Choice (4) Response

a.

[M L T -2 I -2]

b.

[M L T -2 I 2]

c.

[M L -1 T -2 I 2]

d.

[M L -1 T -2 I -2]

Question number: 13

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

In S = a + bt + ct 2, S is measured in meters and t in seconds. The unit of c is

Choices

Choice (4) Response

a.

ms -2

b.

m

c.

ms -1

d.

None of the above

Passage

Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 -11 m 3 kg -1 s -2, the speed of light, c = 3.0 x 10 8 m/s, and Planck’s constant,

h = 6.6 x 10 -34 kg m 2 s -1.

Question number: 14 (1 of 2 Based on Passage) Show Passage

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

Find the value of Planck time in seconds

The universal gravitational constant, G = 6.7 x 10 -11 m 3 kg -1 s -2, the speed of light, c = 3.0 x 10 8 m/s, and Planck’s constant, h = 6.6 x 10 -34 kg m 2 s -1.

Choices

Choice (4) Response

a.

2.3 10 -13 s

b.

1.3 10 -33 s

c.

1.3 10 - 43 s

d.

None of the above

Question number: 15 (2 of 2 Based on Passage) Show Passage

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

The energy of a photon is given by E = hcλ If λ = 4 x 10 - 7 m, the energy of photon is

The universal gravitational constant, G = 6.7 x 10 -11 m 3 kg -1 s -2, the speed of light, c = 3.0 x 10 8 m/s, and Planck’s constant, h = 6.6 x 10 -34 kg m 2 s -1.

Choices

Choice (4) Response

a.

4.5 eV

b.

2.10eV

c.

3.0 eV

d.

3.95 eV

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