NEET Physics: Questions 83 - 86 of 2099

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Passage

The internal radius of a 1 m long resonance tube is measured as 3 cm. A tuning fork of frequency 3500Hz is used. The first resonating length is measured as 14.6 cm and the second resonating length is measured as 24.0 cm.

Question number: 83 (2 of 2 Based on Passage) Show Passage

» Physics and Measurement » Errors in Measurement

MCQ▾

Question

Calculate the speed of sound at the room temperature

Choices

Choice (4) Response
a.

276 m/s

b.

675 m/s

c.

930 m/s

d.

658 m/s

Question number: 84

» Kinematics » Motion in a Straight Line

MCQ▾

Question

The position of a particle moving in the xy-plane at any time t is given by x = (4t 2 - 8t) metres, y = (5t 2 - 10t) metres. Select the correct statement about the moving particle from the following

Choices

Choice (4) Response
a.

The velocity of the particle is zero at t = 1 second

b.

The velocity of the particle is zero at t = 0 second

c.

The acceleration of the particle is zero at t = 0 second

d.

The velocity and acceleration of the particle are never zero

Question number: 85

» 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: 86

» 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

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