NEET Physics: Questions 84 - 87 of 2098

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Question number: 84

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A car accelerates from rest at a constant rate α for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by the car is

Choices

Choice (4) Response

a.

(α2β2αβ)t

b.

(α2+β2αβ)t

c.

αβtα+β

d.

(α+βαβ)t

Question number: 85

» Physics and Measurement » Errors in Measurement

Assertion-Reason▾

Assertion (Ꭺ)

Number of significant figures in 0.005 is one and that in 0.500 is three.

Reason (Ꭱ)

This is because zero is not significant.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 86

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

An express train is moving with a velocity v 1. Its driver finds another train is moving on the same track in the same direction with velocity v 2. To escape collision, driver applies a retardation a on the train, the minimum time of escaping collision will be

Choices

Choice (4) Response

a.

t = v1v2a

b.

t 1 = v12v222

c.

t1 = t-t1

d.

All of the above

Question number: 87

» Physics and Measurement » Dimensions of Physical Quantities

Assertion-Reason▾

Assertion (Ꭺ)

The time period of a pendulum is given by the formula, T = 2π lg

Reason (Ꭱ)

According to the principle of homogeneity of dimensions, only that formula is correct in which the dimensions of L. H. S. is equal to dimensions of R. H. S.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Ꭺ is false but Ꭱ is true

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