11th Standard Syllabus & Materials

11th Standard

TN 11th Tamil இயற்கை வேளாண்மை,சுற்றுச்சூழல் -செய்யுள் - மனோன்மணீயம் Important Questions And Answers Study Material - QB365 Set A

NEW

11th Standard

TN 11th Tamil என்னுயிர் என்பேன் -துணைப்பாடம் - இசைத்தமிழர் இருவர் Important Questions And Answers Study Material - QB365 Set A

NEW

11th Standard

TN 11th Tamil மொழி கலை -செய்யுள் - ஒவ்வொரு புல்லையும் Important Questions And Answers Study Material - QB365 Set A

NEW

11th Standard

TN 11th Tamil பீடு பெற நில் - இலக்கணம் - பகுபத உறுப்புகள் Important Questions And Answers Study Material - QB365 Set A

NEW

11th Standard

TN 11th Tamil பீடு பெற நில் - துணைப்பாடம் - வாடிவாசல் Important Questions And Answers Study Material - QB365 Set A

NEW

11th Standard

TN 11th Tamil பீடு பெற நில் - செய்யுள் - குறுந்தொகை Important Questions And Answers Study Material - QB365 Set A

11th Standard English Medium Physics Subject Waves Book Back 1 Mark Questions with Solution Part - I

Published on: 07/06/2021

QB365 provides detailed and simple solution for every Book back Questions in class 11 Physics Subject. It will helps to get more idea about question pattern in every book back questions with solution.

Download Tamil Nadu 11th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

Take MCQ Physics Test

QB365 Student Learing Managemnet System

Std: 11th Standard - Physics

chapter: - Book back Questions

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Multiple Choice Question

5 x 1 = 5

Let y = \(\frac{1}{1+x^2}\) at t = 0 s be the amplitude of the wave propagating in the positive x-direction. At t = 2 s, the amplitude of the wave propagating becomes \(y=\frac{1}{1+(x-2)^{2}}. \) Assume that the shape of the wave does not change during propagation. The velocity of the wave is

(a)

0.5m s^-1

(b)

1.0m s^-1

(c)

1.5m s^-1

(d)

2.0m s^-1

Which of the following represents a wave

(a)

(x - vt)³

(b)

x(x+vt)

(c)

\(\frac{1}{x+vt}\)

(d)

sin(x+vt)

The displacement y of a wave travelling in the x direction is given by y = (2\(\times\)10 ^-3) sin (300t - 2x + \(\frac{\pi}{4}\)), where x and y are measured in metres and t in second. The speed of the wave is

(a)

150 ms^-1

(b)

300 ms^-1

(c)

450 ms^-1

(d)

600 ms^-1

A person standing between two parallel hills fires a gun and hears the first echo after t₁ sec and the second echo after t₂ sec. The distance between the two hills is

(a)

\(\frac { v({ t }_{ 1 }-{ t }_{ 2 }) }{ 2 } \)

(b)

\(\frac { v\left( { t }_{ 1 }{ t }_{ 2 } \right) }{ 2({ t }_{ 1 }+{ t }_{ 2 }) } \)

(c)

v (t₁+ t₂)

(d)

\(\frac { v({ t }_{ 1 }+{ t }_{ 2 }) }{ 2 } \)

For a particular tube, among six harmonic frequencies below 1000 Hz, only four harmonic frequencies are given: 300 Hz, 600 Hz, 750 Hz and 900 Hz. What are the two other frequencies missing from this list?

(a)

100 Hz, 150 Hz

(b)

150 Hz, 450 Hz

(c)

450 Hz, 700 Hz

(d)

700 Hz, 800 Hz

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Multiple Choice Question

5 x 1 = 5

Factual information
\(\text { At } \mathrm{t}=0 \text { amplitude } \mathrm{y}=\frac{1}{1+x^{2}}\)
\(\text { At } \mathrm{t}=2 \text { amplitude } \mathrm{y}=\frac{1}{1+(x-2)^{2}}\)
\(\therefore v=\frac{\Delta y}{\Delta t} =\frac{2}{2} =1.0 \mathrm{~ms}^{-1} \)

(d)
sin(x+vt)

The given equation is similar to
\(\mathrm{y} =\mathrm{A} \sin \left(\omega t-\frac{x}{\lambda}\right) \)
\(\omega=300, \ \mathrm{f} =\frac{300}{2 \pi}=\frac{150}{\pi} \)
\(\text { Speed } \mathrm{v} =\mathrm{f} \lambda \)
\(=\frac{150}{\pi} \times \pi \)
\(=150 \mathrm{~ms}^{-1} \)

\(2 d_{1}=v t_{1}-\text { first echo }\)
\(2 d_{2}=v t_{2}-\text { second echo }\)
\(\therefore \mathrm{d}=\mathrm{d}_{1}+\mathrm{d}_{2} \quad \therefore \frac{v\left(t_{1}+t_{2}\right)}{2}\)

\(\mathrm{f}_{\mathrm{o}}=150 \mathrm{~Hz}\)
\(\text { From the series of frequencies is }\)
\(f_{1} =2 f_{0} \)
\(f_{2} =3 f_{0} \)
\(=3 \times 150=450 \mathrm{~Hz} \)