Engineering Mechanics Quiz Model Test2

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1. If rain is falling in the opposite direction of the movement of a pedestrain, he has to hold his umbrella
more inclined when moving	less inclined when moving
more inclined when standing	less inclined when standing

2. A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is
0°	30°
45°	60°

3. Limiting force of friction is the ______.
tangent of angle between normal-reac-tion and the resultant of normal reac-tion and limiting friction	ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move	the friction force acting when the body is in motion

4. Coulomb friction is the friction between
bodies having relative motion	two dry surfaces
two lubricated surfaces	solids and liquids

5. Dynamic friction as compared to static friction is _____.
same	more
less	may be less of more depending on na-ture of surfaces and velocity

6. Tangent of angle of friction is equal to _____.
kinetic friction	limiting friction
angle of repose	coefficient of friction

7. Kinetic friction is the ______.
tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction	ratio of limiting friction and normal reaction
the friction force acting when the body is just about to move	the friction force acting when the body is in motion

8. The maximum frictional force which comes into play when a body just begins to slide over another surface is called
limiting friction	sliding friction
rolling friction	kinematic friction

9. The co-efficient of friction depends upon
nature of surfaces	area of contact
shape of the surfaces	ail of the above

10. The necessary condition for forces to be in equilibrium is that these should be
coplanar	meet at one point
both (a) and (b) above	all be equal

11. If three forces acting in different planes can be represented by a triangle, these will be in _____.
non-equilibrium	partial equilibrium
full equilibrium	unpredictable

12. If n = number of members and y = number of joints, then for a perfect frame, n = _____.
j-2	2j-1
2/-3	3/-2

13. A body moves, from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
38 m	62.5 m
96 m	124 m

14. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to _____.
25	50
100	250

15. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
ellipse	hyperbola
parabola	circle

16. Which of the following is not the unit of energy _____.
kg m	kcal
wattr	watt hours

17. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
density of metal can't be determined	metal is twice as dense as water
metal will float in water	metal is twice as dense as unknown fluid

18. The C.G. of a solid hemisphere lies on the central radius 3r
at distance — from the plane base 3r	at distance — from the plane base 3r
at distance — from the plane base 3r	at distance — from the plane base 0r

19. The C.G. of a plane lamina will not be at its geometrical centre in the case of a
right angled triangle	equilateral triangle
square	circle

20. The C.G. of a right circular solid cone of height h lies at the following distance from the base
h/2	J/3
h/6	h/4