Physics and Measurement (NEET Physics): Questions 45 - 49 of 61

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Question number: 45

» Physics and Measurement » SI Units

MCQ▾

Question

Wavelength of ray of light is 0.006 m. It is equal to

Choices

Choice (4) Response

a.

60 microns

b.

6 microns

c.

6000 microns

d.

All of the above

Question number: 46

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

If there is a positive error of 50 % in the measurement of velocity of a body, then the error in the measurement of kinetic energy is

Choices

Choice (4) Response

a.

25%

b.

50%

c.

125%

d.

75%

Question number: 47

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

The unit of percentage error is

Choices

Choice (4) Response

a.

Errors have got their own units which are different from that of physical quantity measured

b.

Different from that of physical quantity

c.

Percentage error is unitless

d.

Same as that of physical quantity

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.

x = 1

b.

y = 1

c.

z = 1

d.

x=-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 mgηr

b.

vT ηrmg

c.

vT rmg

d.

vT mgrη

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