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Physics 1 Marks Question

Mechanical Properties of Solids · MP Board (MPBSE) STD 11 Science (Madhya Pradesh - English Medium). 62 questions.

Questions · Page 2 of 2

1 Marks Question

Question 511 Mark
A wire is replaced by another wire of same length and material but of twice diameter.
  1. What will be the effect on the increase in its length under a given load?
  2. What will be the effect on the maximum load which it can bear?
Answer
  1. Increase in length will be reduced to one fourth as,
$\Delta\text{l}\propto\frac{1}{\text{r}^2}.$
  1. Maximum bearable load becomes four times as breaking force,
$\propto\text{area}(\pi\text{r}^2)$
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Question 521 Mark
The breaking force for a wire is $F.$ What will be the breaking force for
  1. Two parallel wires of this size,
  2. For a single wire of double thickness?
Answer
  1. $2F$
  2. $4F$.
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Question 531 Mark
The length of a wire is reduced by half. What will be the effect on the increase in its length under a given load?
Answer
Increase in length will be reduced to half since $\Delta\text{l}\propto\text{l}_\text{i}$ where $\text{l}_\text{i}$ is initial length.
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Question 541 Mark
When the pressure on a sphere is increased by 80 atmospheres, then its volumes decreases by 0.01%. Find the bulk modulus of elasticity of the material of sphere.
Answer
Here P = 80 atmospheres, $=80\times1.013\times10^5\text{Nm}^{-2}$ $\because\frac{\Delta\text{V}}{\text{V}}=\frac{0.01}{100}$ $\text{B}=\frac{\text{PV}}{\Delta\text{V}}=\frac{80\times1.013\times10^5}{\frac{(0.01)}{100}}$ $=8.1\times10^{10}\text{Nm}^{-2}$
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Question 551 Mark
A thick wire is suspended from a rigid support, but no load is attached to its free end. Is this wire under stress?
Answer
Yes, the wire is under stress due to its own weight.
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Question 561 Mark
A wire is suspended from a roof but no weight is attached to the wire. Is the wire under stress?
Answer
Yes. The weight of the wire itself acts as the deforming force.
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Question 571 Mark
What do you mean by anisotropy? Name the solid that shows anisotropy.
Answer
It refers to the condition under which the physical properties (namely thermal, electrical, mechanical and optical) are different in different directions. (Calcite or any crystalline solid).
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Question 581 Mark
How are the atoms and molecules arranged in a crystalline solid?
Answer
They are arranged in a definite and regular manner throughout the body of the crystal.
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Question 591 Mark
Why are springs made of steel and not of copper?
Answer
Under a given deforming force, the steel spring is stretched lesser than copper spring. Moreover, the steel spring recovers its original state quicker than copper after the removal of deforming force.
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Question 601 Mark
Amorphous solids are not true solids. What are they called then?
Answer
Amorphous solids are called glassy solids and they are super cooled liquid of high viscosity.
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Question 621 Mark
The average depth of Indian Ocean is about $3000 m$. Calculate the fractional compression, $\Delta V / V$, of water at the bottom of the ocean, given that the bulk modulus of water is $2.2 \times 10^9 N m ^{-2}$. (Take $g=10 m s ^{-2}$)
Answer
The pressure exerted by a $3000 m$ column of water on the bottom layer
$
\begin{aligned}
p=h \rho g & =3000 m \times 1000 kg m ^{-3} \times 10 m s ^{-2} \\
& =3 \times 10^7 kg m ^{-1} s ^{-2} \\
& =3 \times 10^7 N m ^{-2}
\end{aligned}
$

Fractional compression $\Delta V / V$, is
$
\begin{aligned}
\Delta V / V=\text { stress } / B & =\left(3 \times 10^7 N m ^{-2}\right) /\left(2.2 \times 10^9 Nm ^{-2}\right) \\
& =1.36 \times 10^{-2} \text { or } 1.36 \%
\end{aligned}
$
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1 Marks Question - Page 2 - Physics STD 11 Science Questions - Vidyadip