# Physics and Measurement (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 48 - 52 of 63

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## Question number: 48

» 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.

z = 1

b.

x=-1

c.

x = 1

d.

y = 1

## Question number: 49

» 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: 50

» Physics and Measurement » Errors in Measurement

MCQ▾

### Question

The mean time period of second’s pendulum is 2.00s and means absolute error in the time period is 0.05s. To express maximum estimate of error, the time period should be written as

### Choices

Choice (4) Response

a.

(2.00 + 0.025) s

b.

(2.00 + 0.05) s

c.

(2.00 - 0.01) s

d.

None of the above

## Question number: 51

» Physics and Measurement » SI Units

MCQ▾

### Question

Wavelength of ray of light is 0.00006 m. It is equal to

### Choices

Choice (4) Response

a.

600 microns

b.

60 microns

c.

0.6 microns

d.

6 microns

## Question number: 52

» Physics and Measurement » Errors in Measurement

MCQ▾

### Question

A physical quantity P is given by P =

. The quantity which brings in the maximum percentage error in P is

### Choices

Choice (4) Response

a.

D

b.

B

c.

A

d.

C