Engineering Mechanics Quiz Set-1

6. A couple consists of......

5. The moment of a force about any point is geometrically equal to……….area of the triangle whose base is the line representing the force and vertex is the point about which the moment is taken.

4. If a number of forces are acting simultaneously on a particle, then the resultant of these forces will have the same effect as produced by the all the forces. This is known as,

3. For a non-concurrent force system to be in equilibrium

2. In order to determine the effects of a force acting on a body, we must know

1. Which of the following statement is correct?

61. A car negotiates a curve of radius 100 m at 25 m/sec. The angle to the horizontal at which the road must be banked to prevent sideways friction on the car wheels is tan"1 x, where x is (Assume g = 10 m/sec2 )

60. A stone was thrown vertically upwards from the ground with a velocity of 50 m/sec. After 5 seconds another stone was thrown vertically upwards from the same place. If both the stones strike the ground at the same time, then the velocity with which the second stone was thrown should be (Assume g = 10 m/sec2 )

59. The angular speed of a car taking a circular turn of radius 100 m at 36 km/hr will be

58. Two objects moving with uniform speeds are 5 m apart after 1 second when they move towards each other and are 1 m apart when they move in the same direction. The speeds of the objects are

57. A particle is dropped from a height of 3 m on a horizontal floor, which has a coefficient of restitution with the ball of 1/2. The height to which the ball will rebound after striking the floor is

56. A ball moving on a smooth horizontal table hits a rough vertical wall, the coefficient of restitution between ball and wall being 1/3. The ball rebounds at the same angle. The fraction of its kinetic energy lost is

55. If a lead ball with a certain velocity is made to strike a wall, it does not rebound. But if a rubber ball of same mass and velocity strikes the same wall, it rebounds. Select correct reason from the following

54. The loss of kinetic energy due to direct impact of two bodies depends on

53. The total momentum of two bodies remains constant after collision or any other mutual action. This is known as

52. Which of the following statement is wrong?

51. The shape of a suspended cable for a uniformly distributed load over it is

50.  Free body diagram is an

49.  In a lifting machine a weight of 5 kN is lifted through 200 mm by an effort of 0.1 kN moving through 15 m. The mechanical advantage and velocity ratio of the machine are respectively

48.  The condition for a lifting machine to be reversible is that its efficiency should be

47. If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then

46.  A heavy ladder resting on floor and against a vertical wall may not be in equilibrium if

45. One Newton is equivalent to

44.  In SI units, the units of force and energy are respectively

43.  The unit of rotational inertia of a body in C.G.S system is

42.  Two masses of 10 kg and 15 kg are connected to two ends of an inextensible rope and passing over a smooth pulley. The 10 kg mass is lying over a rough plane, which is inclined at an angle of 25º with the horizontal. If this angle is made 30º, then

41. Which of the following statement is wrong?

40. The frequency of vibration in case of simple harmonic motion

39.  The periodic time of a body moving with simple harmonic motion

38.  One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

37.  The member forces in a statically indeterminate truss

36.  Free body diagram is an

35.  A particle of mass 2 kg executes simple harmonic motion of frequency 6/71 Hz and amplitude 0.25 m. Its maximum kinetic energy is

34. A stone is thrown up a slope of inclination 60° to the horizontal. At what angle to the slope must the stone be thrown so as to land as far as possible from the point of projection?

33.  A funicular polygon cannot be made to pass through

32.  If the direction of projection bisects the angle between the vertical and the inclined plane, then the range of projectile on the inclined plane is

31.  The maximum value of the horizontal range for a projectile projected with a velocity of 98 m/sec is

30. For a given velocity of a projectile, the range is maximum when the angle of projection is

29.  A flywheel of moment of inertia 20 kg-m2 is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian per second is

28.  A particle moves in a straight line and its position is defined by the equation x = 6 t2 - t 3 where t is expressed in seconds and x in metres. The maximum velocity during the motion is

27. If the angular distance, 0 = 2t3 - 3t2, the angular acceleration at t = 1 sec. is

26.  Rate of change of angular momentum is equal to

25. The time of flight of a projectile on un upward inclined plane depends upon

24. The graphical method of determining the forces in the members of a truss is based on

23.  The ratio of the speed of a rolling cylinder to the speed of sliding cylinder is

22. The torque produced by a force depends on

21.  The angular speed of a car while taking a circular turn of radius 100 m at 36 km/hour, is

20.  Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis?

19.  Which of the following represents the state of neutral equilibrium?

18.  The angles between two forces to make their resultant a minimum and a maximum respectively are

17.  A rod AB carries three loads of 30 N, 70 N and 100 N at distances of 20 mm, 90 mm and 150 mm respectively from A. Neglecting the weight of the rod, the point at which the rod will balance is

16.  The force polygon representing a set of forces in equilibrium is a

15. If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is

14. A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is

13. The moment of inertia of a triangular section of base (b) and height (h) about an axis through its c. g. and parallel to the base is given by the relation,

12. The moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base is ............ as that passing through its C.G. and parallel to the base.

11.  If the sum of all the forces acting on a body is zero, then the body may be in equilibrium provided the forces are

10.  If a body is in equilibrium. We may conclude that

9.  The Lami’s Theorem is applicable only for

8. According to Lami’s Theorem, the three forces

7. A system of forces acting on a lamina is shown in the given figure. The resultant of the force system will meet AB at

The basic stress in masonry units having height to width ratio of 1.5 may be increased by a factor of

A 200 mm thick wall made of modular bricks is 5 m long between cross walls and 3.8 m clear height between RCC slabs at top and bottom. The slenderness ratio of the wall is

Direct load carrying capacity of a brick masonry wall standing freely as against when it supports RC slab will be

Consider the following statements: Sand in mortar is not needed for

For strengthening a 50 m long and 5 m high straight compound wall built in brick work, which one of the following would be most suitable?

Consider the following statements regarding provision of chases in masonry,

In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as

For earthquake resistant masonry buildings, the vertical distance between openings one above the other in a load bearing wall shall not be less than

Cement mortars richer than 1 : 3 are not used in masonry because

Rich cement mortars are more liable to cracking as compared to lean mortars because rich mortars have

Water retentivity for brick masonry should not be less than

For masonry work with solid bricks, consistency of mortar should be

Minimum thickness of stiffening wall for 1 to 3 storeys shall not be less than

Full restraint is provided by

The timber floor not spanning on the masonry wall but properly anchored to the wall gives

The mode of failure of a very short masonry member having h/t ratio of less than 4 is by

For designing masonry components of a structure, seismic forces provision in the design calculation is not necessary for buildings constructed in

If the eccentricity ratio is more than 1/24, then increase in the permissible stress in the design of wall subjected to eccentric loading as per code is

The bending stress in a wall or column subjected to effective vertical load need not be considered, if the eccentricity ratio is

A free standing brick wall 20 cm thick is subjected to a wind pressure of 75kg/m2. The maximum height of wall from stability consideration is

If the horizontal cross-sectional area of a wall is 1200 cm2, then the basic stress shall be multiplied by a reduction factor equal to

The thickness of each leaf of a cavity wall shall not be less than

If H is the height of wall between centres of supports, then the effective height of wall where concrete floors have a bearing on wall irrespective of the direction of span will be

The effective height of free standing non load bearing wall and column respectively will be -------. where H is the height of wall or column between centres of supports.

Where a structural component or a system is providing lateral support to five or more walls or columns, the lateral load to be resisted may be taken as  .................................................. of the total vertical load on the most heavily loaded wall or column in the
group.

Sum of tread and rise must lie between

The vertical posts placed at the top and bottom ends of a flight supporting the hand rail are known as

The function of king post in a king post roof truss is

Higher pitch of the roof

Mansard roof is a roof which slopes in

The type of roof which slopes in two directions with a break in the slope on each side is known as

Plan of arrangement of bricks in masonry Shown in figure is called as-

The silica in Portland cement is

Fat lime can be used in

Plaster of paris is obtained from the calcination of

Hydraulic lime is obtained by

Quick lime is

Pitched and sloping roofs are suitable for

The type of roof suitable in plains where rainfall is meagre and temperature is high is

The type of joint commonly used at the junction of a principal rafter and tie beam in timber trusses is

The type of arch generally constructed over a wooden lintel or over a flat arch for the purpose of carrying the load of the wall above is

In the construction of arches, sand box method is used for

The lintels are preferred to arches because

The triangular space formed between the extrados and the horizontal line drawn through the crown of an arch is known as

Depth or height of the arch is the

Fire bricks are used

Swelling of bricks is known as

Percentage of silica in a good brick earth lies between

The minimum hardness number for marble is about

The vertical distance between the springing line and highest point of the inner curve of an arch is known as

The type of flooring suitable for use in churches, theatres, public libraries and other places where noiseless floor covering is desired is

The bearing capacity of a water logged soil can be improved by

The maximum total settlement for raft foundation on clayey soils should be limited to

The minimum depth of foundation in clayey soils is

The type of pile which is driven at an inclination to resist inclined forces is known as

The type of footing which is used to transmit heavy loads through steel columns is

In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to

The differential settlement in case of foundations on sandy soils should not exceed

As compared to stretcher course, the thickness of joints in header course should be

Number of vertical joints in a stretcher course is x times the number of joints in the header course, where x is equal to

The proportions of lime and sand in the mortar normally used in brick construction are

The slenderness ratio for masonry walls should not be more than

The type of bond provided in brick masonry for carrying heavy loads is

The depression provided in the face of brick during its manufacturing is known as

The pressure acting on the stones in stone masonry construction should be

Compared to mild steel, cast iron has

The basic purpose of a retarder in concrete is

The number of bricks required per cubic meter of brick masonary is

Red colour is imparced to bricks due to

Most weather resisting metamorphic rock is

Which of the following is a mineral

Proper amount of entrained air in concrete results in

Which of the following cements is suitable for use in massive concrete structures such as large dams?

The slump recommended for mass concrete is about

For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of

According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than

Le Chatelier's device is used for determining the

which of the  following statements is "correct".

The nominal size of the modular brick is

The percentage of alumina in a good brick earth lies between

Crushing strength of a first class brick should not be less than

The practical limit of moisture content achieved in air drying of timber is

Plywood is made by bonding together thin layers of wood in such a way that the angle between grains of any layer to grains of adjacent layers is

Common sand is a variety of

Sand stone is

The age of a tree can be known by examining

Specific gravity for most of the building stones lies between

Crushing strength of a good building stone should be more than

A good building stone should not absorb water more than

Sandstone is a

Slate is formed by metamorphic action on