NEET Physics: Questions 93 - 96 of 2098

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Question number: 93

» 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: 94

» Kinematics » Motion in a Straight Line

Assertion-Reason▾

Assertion (Ꭺ)

The position-time graph of a uniform motion in one dimension of a body can have negative slope.

Reason (Ꭱ)

When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 95

» 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: 96

» 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

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