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

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

## Strength of Materials Limiting force of friction is the

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

circle
ellipse
hyperbola
parabola

## Strength of Materials Forces are called coplanar when all of them acting on body lie in

different planes
one point
perpendicular planes
one plane

## 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, â€“ ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

10 kg, - ve sense
10 kg, + ve sense
20 kg, + ve sense
20 kg, - ve sense

## Strength of Materials In ideal machines

mechanical advantage is greater than velocity ratio
mechanical advantage is less than velocity ratio