Engineering Mechanics objective questions with answers part2

Q1. 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

Q2. Which of the following do not have identical dimensions ?
(A) Momentum and impulse
(B) Torque and energy
(C) Kinetic energy and potential energy
(D) Moment of a force and angular momentum

Q3. Which of the following is not the unit of distance ?
(A) angstrom
(B) light year
(C) millimetre
(D) milestone

Q4. Which of the following is the unit of power ?
(A) kW (kilowatt)
(B) hp (horse power)
(C) kcal/sec
(D) All of these

Q5. Which of the following is not the unit of work, energy and heat ?
(A) kcal
(B) kg m
(C) kWhr
(D) hp

Q6. Which of the following is not the unit of pressure ?
(A) kg/cm
(B) ata
(C) atmosphere
(D) newton

Q7. The weight of a body is due to
(A) gravitational pull exerted by the earth
(B) forces experienced by body in atmosphere
(C) force of attraction experienced by particles
(D) gravitational force of attraction towards the centre of the earth

Q8. 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
(C) non-coplanar non-concurrent forces
(D) intersecting forces

Q9. When trying to turn a key into a lock, following is applied
(A) coplanar force
(B) non-coplanar forces
(C) moment
(D) couple

Q10. Which of the following is not a scalar quantity
(A) mass
(B) volume
(C) density
(D) acceleration

Q11. 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

Q12. Which of the following is a vector quantity
(A) energy
(B) momentum
(C) angle
(D) speed

Q13. 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 perpendicular directions are both zero
(D) all of them are inclined equally

Q14. Two non-collinear parallel equal forces acting in opposite direction
(A) balance each other
(B) constitute a moment
(C) constitute a couple
(D) constitute a moment of couple

Q15. According to principle of moments
(A) if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
(B) if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
(C) the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
(D) positive and negative couples can be balanced

Q16. Which of the following is not a vector quantity
(A) weight
(B) velocity
(C) acceleration
(D) moment

Q17. According to law of triangle of forces
(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 force
(C) if three forces acting upon a patticle are represented in magnitude and 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 angle between the other two

Q18. If a rigid body is in equilibrium under the action of three forces, then
(A) the lines of action of these forces meet in a point
(B) the lines of action of these forces are parallel
(C) Both of these
(D) None of these

Q19. D Alemberts principle is used for
(A) reducing the problem of kinetics to equivalent statics problem
(B) determining stresses in the truss
(C) stability of floating bodies
(D) designing safe structures

Q20. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if
(A) the floor is smooth, the wall is rough
(B) the floor is rough, the wall is smooth
(C) the floor and wall both are smooth surfaces
(D) will be in equilibrium under all conditions