Mechanical Properties of Solids Test

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Mechanical Properties of Solids Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

The ratio of lateral strain to the linear strain within elastic limit is known as:

A
Young's modulus

B
Bulk's modulus

C
Rigidity modulus

D
Poisson's ratio

Solution

The ratio of lateral strain to the linear strain within elastic limit is known as Poisson's ratio

The correct option is (d)
Question 2
1 / -0

A spring is made of steel and not of copper because

A
steel is more elastic than copper

B
steel is less elastic than copper

C
steel is more plastic than copper

D
steel is less plastic than copper

Solution

Steel is more elastic than copper. Due to this reason that springs are made of steel not copper.
Question 3
1 / -0

Substances that break just after elastic limit is reached are known as

A
brittle substances

B
breakable substances

C
ductile substances

D
elastic substances

Solution

Substances that break just after elastic limit is reached are known as brittle substances
Question 4
1 / -0

The force required to double the length of the steel wire of area of cross section $$5\times 10^{-5}m^{2}\quad (Y=20\times 10^{10}Pa)$$ in $$N$$ is:

A
$$10^{17}$$

B
$$10^{16}$$

C
$$10^{7}$$

D
$$10^{15}$$

Solution

$$Y=\cfrac{stress}{strain}$$
$$Y=\cfrac{\cfrac{F}{A}}{\cfrac{\triangle l}{l}}$$
$$\triangle l=l$$
$$F=YA$$
$$=20\times 10^{10}\times 5\times 10^{-5}$$
$$=100\times 10^{10}\times 10^{-5}$$
$$=10^7$$
Question 5
1 / -0

A wire is stretched to double its length. The strain is :

A
$$infinity$$

B
$$1$$

C
$$zero$$

D
$$0.5$$

Solution

Longitudinal strain $$= \dfrac{change\,\, in\,\, length}{original\,\, length}$$
If $$l$$ be the original length and if stretched to double of its length , change in length $$= l$$
So , strain $$= 1$$
Question 6
1 / -0

Young's modulus of Perfectly elastic body is

A
Finite value

B
Zero

C
One

D
Infinite value

Solution

Young's modulus for a perfectly elastic body is infinity. For an elastic body, there is no deformation on the application of load. Therefore, the strain is equal to zero. The denominator becomes zero which leads to the infinite value of Young's modulus.
Question 7
1 / -0

A wire whose cross-sectional area is $$4\ mm^{2}$$ is stretched by $$0.1\ mm$$ by a certain load. If a similar wire of double the area of cross-section is under the same load, then the elongation would be

A
$$0.5\ mm$$

B
$$0.05\ mm$$

C
$$0.005\ mm$$

D
$$5\ mm$$

Solution

$$0.05mm$$

Formula,

$$y=\dfrac{Fl}{Ae}$$

$$\Rightarrow e\propto \dfrac{1}{A}$$

$$\dfrac{e_2}{0.1}=\dfrac{4}{8}=\dfrac{1}{2}$$

$$\therefore e_2=0.05mm$$
Question 8
1 / -0

Bulk modulus was first defined by

A
Young

B
Bulk

C
Maxwell

D
None of the above

Solution
Question 9
1 / -0

Minimum and maximum values of Poisson’s ratio for a metal lies between

A
$$-\infty$$ to $$+\infty$$

B
$$0$$ to $$1$$

C
$$-\infty$$ to $$1$$

D
$$0$$ to $$0.5$$

Solution
Question 10
1 / -0

The only elastic modulus that applies to fluids is

A
Young's Modulus

B
Shear Modulus

C
Modulus of rigidity

D
Bulk modulus

Solution

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Re-Attempt Weekly Quiz Competition

Mechanical Properties of Solids Test - 15

Result

Mechanical Properties of Solids Test - 15

Score

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Rank

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SHARING IS CARING

Question 1

Young's modulus

Bulk's modulus

Rigidity modulus

Poisson's ratio

Solution

Question 2

steel is more elastic than copper

steel is less elastic than copper

steel is more plastic than copper

steel is less plastic than copper

Solution

Question 3

brittle substances

breakable substances

ductile substances

elastic substances

Solution

Question 4

$$10^{17}$$

$$10^{16}$$

$$10^{7}$$

$$10^{15}$$

Solution

Question 5

$$infinity$$

$$1$$

$$zero$$

$$0.5$$

Solution

Question 6

Finite value

Zero

One

Infinite value

Solution

Question 7

$$0.5\ mm$$

$$0.05\ mm$$

$$0.005\ mm$$

$$5\ mm$$

Solution

Question 8

Young

Bulk

Maxwell

None of the above

Solution

Question 9

$$-\infty$$ to $$+\infty$$

$$0$$ to $$1$$

$$-\infty$$ to $$1$$

$$0$$ to $$0.5$$

Solution

Question 10

Young's Modulus

Shear Modulus

Modulus of rigidity

Bulk modulus

Solution

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