# The stress-strain curves are drawn for two different materials $$X$$ and $$Y.$$ It is observed that the ultimate strength point and the fracture point are close to each other for material $$X$$ but are far apart for material $$Y.$$ We can say that the materials $$X$$ and $$Y$$ are likely to be (respectively): 1. ductile and brittle 2. brittle and ductile 3. brittle and plastic 4. plastic and ductile

Subtopic:  Stress - Strain Curve |
81%
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NEET - 2019
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The increase in the length of a wire on stretching is $$0.04$$%. If Poisson's ratio for the material of wire is $$0.5,$$ then the diameter of the wire will:

 1 decrease by $$0.02$$%. 2 decrease by $$0.01$$%. 3 decrease by $$0.04$$%. 4 increase by $$0.03$$%.
Subtopic:  Poisson's Ratio |
73%
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The Poisson's ratio of a material is $$0.4.$$ If a force is applied to a wire of this material, there is a decrease in the cross-section area by $$2$$%. In such a case the percentage increase in its length will be:

 1 $$3$$% 2 $$2.5$$% 3 $$1$$% 4 $$0.5$$%
Subtopic:  Poisson's Ratio |
63%
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A steel wire of length $$4.7$$ m and cross-sectional area $$3.0 \times 10^{-5}$$ m2 is stretched by the same amount as a copper wire of length $$3.5$$ m and cross-sectional area of $$4.0 \times 10^{-5}$$ m2 under a given load. The ratio of Young’s modulus of steel to that of copper is:
1. $$1.79:1$$
2. $$1:1.79$$
3. $$1:1$$
4. $$1.97:1$$

Subtopic:  Young's modulus |
71%
From NCERT
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The figure shows the strain-stress curve for a given material. What is Young’s modulus for this material?

1. $$7.5\times10^{11}~\text{Nm}^{-2}$$
2. $$7.5\times10^{10}~\text{Nm}^{-2}$$
3. $$7.5\times10^{9}~\text{Nm}^{-2}$$
4. $$7.5\times10^{-10}~\text{Nm}^{-2}$$

Subtopic:  Stress - Strain Curve |
79%
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The stress-strain graphs for materials $$A$$ and $$B$$ are shown in the figure. Strength of material $$A$$ is:
(The graphs are drawn to the same scale)

 1 greater than material $$B$$ 2 equal to material $$B$$ 3 less than material $$B$$ 4 insufficient data

Subtopic:  Stress - Strain Curve |
72%
From NCERT
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Two wires of diameter $$0.25$$ cm, one made of steel and the other made of brass are loaded, as shown in the figure. The unloaded length of the steel wire is $$1.5$$ m and that of the brass wire is $$1.0$$ m. The elongation of the steel wire will be:
(Given that Young's modulus of the steel, $$Y_S=2 \times 10^{11}$$ Pa$\mathrm{}$ and Young's modulus of brass, $$Y_B=1 \times 10^{11}$$ Pa)

 1 $$1.5 \times 10^{-4}$$ m 2 $$0.5 \times 10^{-4}$$ m 3 $$3.5 \times 10^{-4}$$ m 4 $$2.5 \times 10^{-4}$$ m
Subtopic:  Young's modulus |
55%
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The volume contraction of a solid copper cube, 10 cm on an edge, when subjected to a hydraulic pressure of $$7.0\times10^6$$ Pa is: (Bulk modulus of copper is $140×{10}^{9}$ $\mathrm{Pa}$.)
1. $$3.1 \times 10^{-2} \mathrm{~m}^3$$
2. $$9.1 \times 10^{-3} \mathrm{~cm}^3$$
3. $$5.0 \times 10^{-2} \mathrm{~cm}^3$$
4. $$7.9 \times 10^{-2} \mathrm{~cm}^3$$

Subtopic:  Shear and bulk modulus |
81%
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How much should the pressure on a litre of water be changed to compress it by $$0.10 \%?$$
(Given Bulk modulus of water, $$B=2.2\times 10^9$$ N-m-2)
1. $$4.8 \times 10^6$$ N/m2
2. $$2.2 \times 10^6$$ N/m2
3. $$5.1 \times 10^6$$ N/m2
4. $$3.3 \times 10^6$$ N/m2

Subtopic:  Shear and bulk modulus |
88%
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Hooke's law is applicable for:

 1 elastic materials only 2 plastic materials only 3 elastomers only 4 all of these

Subtopic:  Hooke's Law |
68%
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