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Strength of Materials

Strength of Materials
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is

double
same
four times
half

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Strength of Materials
A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

metal is twice as dense as unknown fluid
metal will float in water
density of metal can’t be determined
metal is twice as dense as water

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Strength of Materials
A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of

r/2
r/%
0.134 r
r/A

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Strength of Materials
The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be

r/A
3r/2
r/2
2r/3

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Strength of Materials
The effort required to lift a load W on a screw jack with helix angle a and angle of friction<="" div="">

Wcos(a + )
Wsin(a + <(>)
Wtan(a-<)>)
Wtan(a + <)>)

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Strength of Materials
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of

balance of force
forces
independence of forces
resolution of forces.

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