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#### Properties of Matter Book Back Questions

11th Standard

Reg.No. :
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Physics

Time : 00:45:00 Hrs
Total Marks : 30
5 x 1 = 5
1. Consider two wires X and Y. Th e 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

2. If a wire is stretched to double of its original length, then the strain in the wire is

(a)

1

(b)

2

(c)

3

(d)

4

3. 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

4. Which of the following is not a scalar?

(a)

viscosity

(b)

surface tension

(c)

pressure

(d)

stress

5. If the temperature of the wire is increased, then the Young’s modulus will

(a)

remain the same

(b)

decrease

(c)

increase rapidly

(d)

increase by very a small amount

6. 3 x 2 = 6
7. A wire 10 m long has a cross-sectional area 1.25 x 10-4 m2. It is subjected to a load of 5 kg. If Young’s modulus of the material is 4 x 1010 N m-2, calculate the elongation produced in the wire. Take g = 10 ms-2.

8. Define Poisson’s ratio.

9. State Archimedes principle.

10. 3 x 3 = 9
11. Let 2.4×10−4 J of work is done to increase the area of a film of soap bubble from 50 cm2 to 100 cm2. Calculate the value of surface tension of soap solution.

12. Water rises in a capillary tube to a height of 2.0cm. How much will the water rise through another capillary tube whose radius is one-third of the first tube?

13. Mercury has an angle of contact equal to 140° with soda lime glass. A narrow tube of radius 2 mm, made of this glass is dipped in a trough containing mercury. By what amount does the mercury dip down in the tube relative to the liquid surface outside?. Surface tension of mercury T=0.456 N m-1; Density of mercury $\rho$ = 13.6 × 103 kg m-3

14. 2 x 5 = 10
15. State and prove Archimedes principle

16. Obtain an expression for the excess of pressure inside a i) liquid drop ii) liquid bubble iii) air bubble.