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11th Standard English Medium Physics Subject Properties of Matter Book Back 1 Mark Questions with Solution Part - II

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.

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Std: 11th Standard - Physics

chapter: - Book back Questions

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Questions:

Multiple Choice Question

5 x 1 = 5

Which of the following is not a scalar?

(a)

viscosity

(b)

surface tension

(c)

pressure

(d)

stress

With an increase in temperature, the viscosity of liquid and gas, respectively will

(a)

increase and increase

(b)

increase and decrease

(c)

decrease and increase

(d)

decrease and decrease

A small sphere of radius 2cm falls from rest in a viscous liquid. Heat is produced due to viscous force. The rate of production of heat when the sphere attains its terminal velocity is proportional to

(a)

2²

(b)

2³

(c)

2⁴

(d)

2⁵

The load – elongation graph of three wires of the same material are shown in figure. Which of the following wire is the thickest?

(a)

wire 1

(b)

wire 2

(c)

wire 3

(d)

all of them have same thickness

Consider two wires X and Y. The radius of wire X is 3 times the radius of Y. If they are stretched by the same load then the stress on Y is

(a)

equal to that on X

(b)

thrice that on X

(c)

nine times that on X

(d)

Half that on X

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Answers Key:

Multiple Choice Question

5 x 1 = 5

(d)
stress

Rate of heat production
\(=\frac{\text { Work done }}{\text { Timetaken }}\)
Terminal velocity
\(v=\frac{2}{a} \frac{r^{2}(f-\sigma)}{\eta} g \)
\(v \propto r^{2} \)
\(\text { Work } \propto \text { Force } \times \text { distance }\)
\(\propto r^{2} \times r \Rightarrow 2^{5}\)

For the wire 1
Young's modulus is less
\(\text { Young's modulus } Y \propto \frac{F}{A}\)
\(\therefore \text { Area is more }\)
\(\therefore \text { Wire } 1 \text { is thickest }\)

\(\text { Stress, } \ \frac{F}{A}=Y \frac{\Delta L}{L}\)
\(\text { Stress } \mathrm{S}=\frac{\text { Force }}{\pi r^{2}}\)
\(S_{1} \propto \frac{1}{r_{1}^{2}} \ S_{2} \propto \frac{1}{r_{2}^{2}} \ F \text { is same }\)
\(\frac{S_{1}}{S_{2}}=\frac{r_{2}^{2}}{r_{1}^{2}} \quad r_{1}=3 r_{2}\)
\(\text { Let } S_{1}=S_{x} \text { and } S_{2}=S_{y}\)
\( \frac{S_{x}}{S_{y}}=\frac{r_{2}^{2}}{\left(3 r_{2}\right)^{2}}=\frac{r_{2}^{2}}{9 r_{2}^{2}}=\frac{1}{9} \)
\( \frac{S_{x}}{S_{y}}=\frac{1}{9} \)
\(\therefore S_{y}=9 S_{x} \)