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Strength of Materials

Strength of Materials
Which of the following is not a scalar quantity

density
volume
acceleration
mass

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Strength of Materials
Which of the following is not the unit of energy

wattr
watt hours
kg m
kcal

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Strength of Materials
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

10 kg, + ve sense
20 kg, + ve sense
20 kg, – ve sense
10 kg, – ve sense

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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="">

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

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Strength of Materials
If n = number of members andy = number of joints, then for a perfect frame, n =

2/-3
j-2
(b)2j-l
(d)3/-2

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Strength of Materials
The co-efficient of friction depends upon

nature of surfaces
shape of the surfaces
area of contact
All of the listed here

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