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question_answer1)
Modulus of rigidity of diamond is
A)
Too less done
clear
B)
Greater than all matters done
clear
C)
Less than all matters done
clear
D)
Zero done
clear
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question_answer2)
The ratio of lengths of two rods A and B of same material is 1 : 2 and the ratio of their radii is 2 : 1, then the ratio of modulus of rigidity of A and B will be
A)
4 : 1 done
clear
B)
16 : 1 done
clear
C)
8 : 1 done
clear
D)
1 : 1 done
clear
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question_answer3)
Which statement is true for a metal [DPMT 2001]
A)
\[Y<\eta \] done
clear
B)
\[Y=\eta \] done
clear
C)
\[Y>\eta \] done
clear
D)
\[Y<1/\eta \] done
clear
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question_answer4)
Which of the following relations is true [CPMT 1984]
A)
\[3Y=K(1-\sigma )\] done
clear
B)
\[K=\frac{9\eta Y}{Y+\eta }\] done
clear
C)
\[\sigma =(6K+\eta )Y\] done
clear
D)
\[\sigma =\frac{0.5Y-\eta }{\eta }\] done
clear
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question_answer5)
Two wires A and B of same length and of the same material have the respective radii \[{{r}_{1}}\] and \[{{r}_{2}}\]. Their one end is fixed with a rigid support, and at the other end equal twisting couple is applied. Then the ratio of the angle of twist at the end of A and the angle of twist at the end of B will be [AIIMS 1980]
A)
\[\frac{r_{1}^{2}}{r_{2}^{2}}\] done
clear
B)
\[\frac{r_{2}^{2}}{r_{1}^{2}}\] done
clear
C)
\[\frac{r_{2}^{4}}{r_{1}^{4}}\] done
clear
D)
\[\frac{r_{1}^{4}}{r_{2}^{4}}\] done
clear
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question_answer6)
When a spiral spring is stretched by suspending a load on it, the strain produced is called
A)
Shearing done
clear
B)
Longitudinal done
clear
C)
Volume done
clear
D)
Transverse done
clear
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question_answer7)
The Young's modulus of the material of a wire is \[6\times {{10}^{12}}\,N/{{m}^{2}}\] and there is no transverse strain in it, then its modulus of rigidity will be
A)
\[3\times {{10}^{12}}\,N/{{m}^{2}}\] done
clear
B)
\[2\times {{10}^{12}}\,N/{{m}^{2}}\] done
clear
C)
\[{{10}^{12}}\,N/{{m}^{2}}\] done
clear
D)
None of the above done
clear
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question_answer8)
If the Young's modulus of the material is 3 times its modulus of rigidity, then its volume elasticity will be
A)
Zero done
clear
B)
Infinity done
clear
C)
\[2\times {{10}^{10}}\,N/{{m}^{2}}\] done
clear
D)
\[3\times {{10}^{10}}\,N/{{m}^{2}}\] done
clear
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question_answer9)
Modulus of rigidity of a liquid [RPET 2000]
A)
Non zero constant done
clear
B)
Infinite done
clear
C)
Zero done
clear
D)
Cannot be predicted done
clear
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question_answer10)
For a given material, the Young's modulus is 2.4 times that of rigidity modulus. Its Poisson's ratio is [EAMCET 1990; RPET 2001]
A)
2.4 done
clear
B)
1.2 done
clear
C)
0.4 done
clear
D)
0.2 done
clear
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question_answer11)
A cube of aluminium of sides 0.1 m is subjected to a shearing force of 100 N. The top face of the cube is displaced through 0.02 cm with respect to the bottom face. The shearing strain would be
A)
0.02 done
clear
B)
0.1 done
clear
C)
0.005 done
clear
D)
0.002 done
clear
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question_answer12)
The reason for the change in shape of a regular body is [EAMCET 1980]
A)
Volume stress done
clear
B)
Shearing strain done
clear
C)
Longitudinal strain done
clear
D)
Metallic strain done
clear
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question_answer13)
The lower surface of a cube is fixed. On its upper surface, force is applied at an angle of 30° from its surface. The change will be of the type
A)
Shape done
clear
B)
Size done
clear
C)
None done
clear
D)
Shape and size done
clear
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question_answer14)
The upper end of a wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle of\[30{}^\circ \]. Then angle of shear is [NCERT 1990; MP PMT 1996]
A)
\[12{}^\circ \] done
clear
B)
\[0.12{}^\circ \] done
clear
C)
\[1.2{}^\circ \] done
clear
D)
\[0.012{}^\circ \] done
clear
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question_answer15)
Mark the wrong statement [MP PMT 2003]
A)
Sliding of molecular layer is much easier than compression or expansion done
clear
B)
Reciprocal of bulk modulus of elasticity is called compressibility done
clear
C)
It is difficult to twist a long rod as compared to small rod done
clear
D)
Hollow shaft is much stronger than a solid rod of same length and same mass done
clear
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question_answer16)
A 2 m long rod of radius 1 cm which is fixed from one end is given a twist of 0.8 radians. The shear strain developed will be [RPET 1997]
A)
0.002 done
clear
B)
0.004 done
clear
C)
0.008 done
clear
D)
0.016 done
clear
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question_answer17)
A rod of length l and radius r is joined to a rod of length l/2 and radius r/2 of same material. The free end of small rod is fixed to a rigid base and the free end of larger rod is given a twist of \[\theta {}^\circ \], the twist angle at the joint will be [RPET 1997]
A)
\[\theta /4\] done
clear
B)
\[\theta /2\] done
clear
C)
\[5\theta /6\] done
clear
D)
\[8\theta /9\] done
clear
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question_answer18)
Shearing stress causes change in [RPET 2002; BCECE 2001, 04]
A)
Length done
clear
B)
Breadth done
clear
C)
Shape done
clear
D)
Volume done
clear
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