Brain Busters | Knowledge Tester | SCEM | Session 2019-2023

The unit of work or energy in S.I. units is

• (a) newton
• (b) pascal
• (c) kilogram meter
• (d) watt
• (e) joule.

Forces are called concurrent when their lines of action meet in

• (a) one point
• (b) two points
• (c) plane
• (d) perpendicular planes
• (e) different planes.

Which is the correct statement about law of polygon of forces ?

• (a) if any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium
• (b) if any number of forces acting at a point can be represented in direction and magnitude by the<br />sides of a polygon, then the forces are in equilibrium<br />
• (c) if a polygon representing forces acting at a point is closed then forces are in equilibrium<br />
• (d) if any number of forces acting at a point can be represented in direction and magnitude by the<br />sides of a polygon taken in order, then the forces are in equilibrium
• (e) none of the above.

A force is completely defined when we specify

• (a) magnitude
• (b) direction
• (c) point of application
• (d) all of the above
• (e) none of the above.

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

• (a) forces
• (b) independence of forces
• (c) dependence of forces
• (d) balance of force
• (e) resolution of forces.

The forces, which meet at one point, but their lines of action do not lie in a plane, are called

• (a) coplanar non-concurrent forces
• (b) non-coplanar concurrent forces<br />
• (c) non-coplanar non-concurrent forces
• (d) intersecting forces
• (e) none of the above.

According to Lami's theorem

• (a) three forces acting at a point will be in equilibrium
• (b) three forces acting at a point can be represented by a triangle, each side being proportional to<br />force<br />
• (c) if three forces acting upon a particle are represented in magnitude and<br />direction by the sides of a triangle, taken in order, they will be in equilibrium
• (d) if three forces acting at a point are in equilibrium, each force is proportional to the sine of the anglebetween the other two
• (e) none of the above.

The units of moment of inertia of an area are

• (a) kg m2
• (b) m4
• (c) kg/m2
• (d) m3
• (e) kg/m4.

The coefficient of friction depends on

• (a) area of contact
• (b) shape of surfaces
• (c) strength of surfaces
• (d) nature of surface
• (e) all of the above.

The ratio of limiting friction and normal reaction is known as

• (a) coefficient of friction
• (b) angle of friction
• (c) angle of repose
• (d) sliding friction
• (e) friction resistance.