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.Management Sciences
Category: Engineering Mechanics
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is__________________?
A. same
B. double
C. half
D. four times
E. one fourth
Dynamic friction as compared to static friction is___________________?
A. same
B. more
C. less
D. may be less of more depending on nature of surfaces and velocity
E. has no correlation
Friction force for dry surfaces. Friction force is________________?
Pick up wrong statement?
A. proportional to normal load between the surfaces
B. dependent on the materials of contact surface
C. proportional to velocity of sliding
D. independent of the area of contact surfaces
E. none of the above is wrong statement
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
E. none of the above.
If two equal forces of magnitude P act at an angle 9°, their resultant will be________________?
A. P/2 cos 9/2
B. IP sin 9/2
C. 2P tan 9/2
D. IP cos 9/2
E. Psin 9/2
If a number of forces act simultaneously on a particle, it is possible _____________________?
A. not a replace them by a single force
B. to replace them by a single force
C. to replace them by a single force through C.G.
D. to replace them by a couple
E. to replace them by a couple and a force
Which of the following is a vector quantity___________________?
A. energy
B. mass
C. momentum
D. angle
E. speed
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_________________?
A. density of metal can’t be determined
B. metal is twice as dense as water
C. metal will float in water
D. metal is twice as dense as unknown fluid
E. none of the above
A projectile is fired at an angle 9 to the vertical. Its horizontal range will be maximum when 9 is_______________?
A. 0°
B. 30°
C. 45°
D. 60°
E. 90°.
The units of moment of inertia of mass are ________________?
A. kg m2
B. m4
C. kg/m2
D. kg/m
E. m2/kg
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