# Physics and Measurement-Dimensions of Physical Quantities (NEET (NTA)-National Eligibility cum Entrance Test (Medical) 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

b.

vT

c.

vTrmg

d.

vT

## 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 = 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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