A number of forces acting at a point will be in equilibrium if_________________?
(A) their total sum is zero
(B) two resolved parts in two directions at right angles are equal
(C) sum of resolved parts in any two per-pendicular directions are both zero
(D) all of them are inclined equally
(D) none of the above
According to principle of transmissibility of forces, the effect of a force upon a body is_______________?
(A) maximum when it acts at the center of gravity of a body
(B) different at different points in its line of action
(C) the same at every point in its line of action
(D) minimum when it acts at the C.G. of the body
(D) none of the above
When trying to turn a key into a lock, following is applied___________________?
(A) coplanar force
(B) non-coplanar forces
(C) lever
(D) moment
(D) couple
The weight of a body is due to____________________?
(A) centripetal force of earth
(B) gravitational pull exerted by the earth
(C) forces experienced by body in atmos-phere
(D) force of attraction experienced by par-ticles
(D) gravitational force of attraction towards the centre of the earth
Which of the following is not the unit of work, energy and heat ?
(A) kcal
(B) kg m
(C) kWhr
(D) hp
(D) hp hr
Which of the following is not the unit of distance ?
(A) angstrom
(B) light year
(C) micron
(D) millimeter
(D) milestone
The resolved part of the resultant of two forces inclined at an angle 9 in a given direction is equal to__________________?
(A) the algebraic sum of the resolved parts of the forces in the given direction
(B) the sum of the resolved parts of the forces in the given direction
(C) the difference of the forces multiplied by the cosine of 9
(D) the sum of the forces multiplied by the sine of 9
(D) the sum of the forces multiplied by the tangent of 9
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 sides of a polygon, then the forces are in equilibrium
(C) if a polygon representing forces acting at a point is closed then forces are in equilibrium
(D) if any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
(D) 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
(D) resolution of forces
Which of the following is not the unit of power ?
(A) kW (kilowatt)
(B) hp (horse power)
(C) kcal/sec
(D) kg m/sec
(D) kcal/kg sec