Strength of Materials
Which of the following is the example of lever of first order?

All of the listed here
Pair of scissors
Arm of man
Pair of clinical tongs

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Strength of Materials
The weight of a body is due to

gravitational pull exerted by the earth
force of attraction experienced by par-ticles
centripetal force of earth
gravitational force of attraction towards the centre of the earth.

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Strength of Materials
Coefficient of friction is the

the friction force acting when the body is in motion
ratio of limiting friction and normal reaction
angle between normal reaction and the resultant of normal reaction and the limiting friction
the friction force acting when the body is just about to move

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