IES Paper Engineering Mechanics Preli. Exams

IES Paper Engineering Mechanics Preli. Exams
 Free Online Civil Service Engineering Test

1. stone is thrown vertically upward with a

vertical velocity of 49 m/sec. It return to the

ground in

(a) 5 sec

(b) 8 sec

(c) 10 sec

(d) 20 sec

ANSWER:(c)

2. The angle between two forces to make their

resultant a minimum and a maximum respectively

(a) 0° and 90°

(b) 180° and 90°

(c) 90° and 180°

(d) 180° and 0°

ANSWER:(d)

3. The angle of projection at which the horizontal

range and maximum height of a projectile are equal is

(a) 36°

(b) 45°

(c) 56°

(d) 76°

ANSWER:(d)

4. The time period of a simple pendulum depend on

(i) Mass of suspended particle

(ii) Length of the pendulum

(iii) Acceleration due to gravity

The correct answer is

(a) Only (i)

(b) Both (ii) and (iii)

(c) Both (i) and (iii)

(d) All of these

ANSWER:(b)

5. The maximum displacement of a particle executing

  S.H.M. corresponds to

(a) Zero potential energy and maximum kinetic energy

(b) Zero K.E. and maximum P.E.

(c) Maximum K.E. and maximum P.E.

(d) Minimum K.E. and minimum P.E.

 ANSWER:(b)

6. The resultant of two forces P and Q is R, If Q is

doubled, the new resultant is perpendicular to P, then

(a) P=R

(b) Q=R

(c) P=Q

(d) None of the above

ANSWER:(b)

7. A block in the shape of a parallelepiped of sides

lm X 2m X 3m lies on the surfaces Which face

of the given block gives maximum stable

block?

(a) 1 m X 20 m

(b) 2m X 3 m

(c) 1 m X 3 m

(d) Equally stable on all faces

ANSWER:(b)

8. A uniform pyramid and a uniform prism of same

height lies with their base on the surface. Which

is more stable?

(a) Pyramid

(b) Prism

(c) Both equally stable

(d) None of these

ANSWER:(a)

9. The pole distance is measured in

(a) Distance scale

(b) Force scale

(c) Mass scale

(d) Time scale

ANSWER:(b)

10. Which of the following is in equilibrium

unstable?

(a) A uniform solid cone resting on a

generator on a smooth horizontal plane

(b) A uniform solid cone resting on its base

on a horizontal plane

(c) A solid cube resting on the edge

(d) A satellite encircling one earth.

ANSWER:(c)

11. Willet Mohr diagram is used to determine deflection in

(a) Truss only

(b) Beam only

(c) Rigid frame only

(d) Any type of structure

ANSWER:(a)

12. For a self locking machine, the efficiency should be

(a) Less than 60%

(b) 50%

(c) More than 50%

(d) None of these

ANSWER:(a)

13. If forces of 1N, 2N, 3N, 4N, 5N and 6N act in

order along the side of a regular hexagon, their

resultant is

(a) 0

(b) 12N

(c) 6N

(d) 21 N

ANSWER:(b)

14. A geostationary satellite is one which orbits the

earth with a velocity of rotation of

(a) Moon

(b) Earth

(c) Sun

(d) Pole

ANSWER:(b)

15. The rotational velocity of a satellite is increased

by 450 m per second if its launch is done from equator

(a) Eastward

(b) Northward

(c) Westward

(d) Upward

ANSWER:(a)

16. Joule is the unit of

(a) Work

(b) Force

(c) Power

(d) None of these

ANSWER:(a)

17. To attain the synchronous orbit the launch of

a satellite is done from a place

(a) On equator

(b) On 30° latitude .

(c) On 45° latitude

(d) On 60° latitude

ANSWER:(a)

18. Power can be expressed as

(a) Work/energy

(b) Work/time

(c) Work  time

(d) Work/distance

 ANSWER:(b)

19.  According to Kennedy’s theorem, if three bodies

have plane motion, their instantaneous centre lies on

(a) A point

(b) A straight line

(c) Two straight lines

(d) A triangle

ANSWER:(b)

20. When a body falls freely under gravitational

force it possesses

(a) Maximum weight

(b) Minimum weight

(c) No weight

(d) No effect on its weight

ANSWER:(c)

21. The practical unit of work is

(a) Erg

(b) Joule

(c) Newton

(d) Dyne

ANSWER:(b)

22. A 50 kg boy climbs up a 8 m rope in gymnasium

In 10 seconds. The average power developed by

the boy is approximately.

(a) 400 watt

(b) 500 watt

(c) 4000 watt

(d) None of these

ANSWER:(a)

23. Free body diagram is an

(a) Isolated joint with only body forces acting on it

(b) Isolated joint with internal forces acting on it

(c) Isolated joint with all the forces internal as well as external acting on it

(d) None of the above

ANSWER:(c)

24. Which one of the following structures can be

classified in a system of coplanar forces?

(a) A grid

(b) A plane pin jointed truss

(c) A shaft

(d) A Slab

ANSWER:(a)

25. Impulse can be obtained from a

(a) Force displacement diagram

(b) Force-time diagram

(c) Velocity-time diagram

(d) Velocity-displacement diagram

ANSWER:(b)