MECHANICAL ENGINEERING APPLIED MECHANICS MCQs

A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he

moves towards the axis of rotation

accepts a heavy bag from one of his friends standing near by and holds it in his hand

extends his arms outwards

jumps out from the platform

Correct! Wrong!

Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be

Correct! Wrong!

The forces which meet at one point but their lines of action do not lie in one plane, are called

Coplanar concurrent forces

Coplanar noncurrent forces

Non-coplanar nonconcurrent forces

Intersecting forces

Correct! Wrong!

A particle is moving in Simple Harmonic Motion in a simple pendulum with some period of oscillation. Now in order to double the period of oscillation

The mass of the bob should be doubled

The mass of the bob should be halved

The length of pendulum should be doubled

The length of pendulum should be quadrupled

The length of pendulum should be reduced to one fourth

Correct! Wrong!

A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will

Increase

Decrease

Not change

Decrease but reduction depends on viscosity of oil

Correct! Wrong!

A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be

1 sec

2 sec

3 sec

4 sec

Correct! Wrong!

A particle in simple Harmonic Motion while passing through mean position will have

Maximum kinetic energy and maximum

Maximum kinetic energy and minimum potential energy

Minimum kinetic energy and maximum potential energy

Minimum kinetic energy and minimum potential energy

Average kinetic energy and average potential energy

Correct! Wrong!

A jet engine works on the principle of

Conservation of energy

Conservation of linear momentum

Conservation of mass

Conservation of mass and momentum

Correct! Wrong!

A body in Simple Harmonic Motion will attain maximum velocity when it passes through

Extreme point of the oscillation of L.H.S.

Extreme point of the oscillation at R.H.S.

Mean position

Point of half amplitude

Point of 0.75 amplitude

Correct! Wrong!

The centre of gravity of a plane lamina will not be at its geometrical centre if it is a

Square

Rectangle

Right angled triangle

Equilateral triangle

Correct! Wrong!

The necessary condition of equilibrium of a body is

The algebraic sum of horizontal components of all forces must be zero

The algebraic sum of vertical components of all forces must be zero

All the aboveThe algebraic sum of forces about a point must be zero

All the above

Correct! Wrong!

When a body moves round a fixed axis it will have

A circular motion

A rotary motion

A translatory motion

A swinging motion

A motion of rotation and translation

Correct! Wrong!

A rigid body is suspended vertically at a point and oscillates with a small amplitude under the action of the force of gravity. Such an arrangement is called

Simple pendulum

Newton's pendulum

Compound pendulum

Second's pendulum

Rigid pendulum

Correct! Wrong!

The motion of a bicycle wheel is

Linear

Rotary

Translatory

Rotary as well as translatory

Curvilinear

Correct! Wrong!

A cannon of weight 10 tonnes fires a shell of 50 kg with a muzzle velocity of 900 m/sec at an angle of 30?. The time taken for the shell to emerge from the barrel is 0.004 sec. The velocity of the cannon would be

1.95 m/sec

3.9 m/sec

5.85 m/sec

7.8 m/sec

8.95 m/sec

Correct! Wrong!

A body of weight W is resting at a plane inclined at 30? to the horizontal. It is attached to a string making an angle of 60? with horizontal. If the angle of friction be 30? the tension in the string would be

Zero

W/2

Correct! Wrong!

The earth's gravitational force field is said to be conservative force field because

The value of gravitational force rise is fixed

The direction of gravitational force is fixed

The work acted by the earth's gravitational field on a particle is independent on the path traced out by the particle

The work acted by the erth's gravitational field will cause same path for all particles irrespective of their mass

The gravitational field has only single directional component always acting normal to a body

Correct! Wrong!

The tension in the wire rope supporting a lift moving with a uniform velocity

Is more when the lift is moving downwards

Is less when the lift is moving upwards

Is more when the lift is moving upwards

Is less when the lift is moving down-wards

Remains constant irrespective of the lift movement

Correct! Wrong!

The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as

Dynamic friction

Rolling friction

Kinetic friction

Limiting friction

Sliding friction

Correct! Wrong!

The angle of friction is

The angle which frictional force makes with the normal

The anle at which the force applied from external souce will cause movement

The angle at which fictional force is inclined to external force

The angle between the normal reaction and the resultant of normal reaction and the limiting friction

Correct! Wrong!

The coefficient of friction is

The angle between the normal reaction and the resultant of normal reaction and the limiting friction

The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction

The tangent of the angle of the net resultant force with the direction of motion

The tangent of the angle between the normal reaction and direction of limiting friction

The tangent of the angle between the horizontal plane and the resultant force

Correct! Wrong!

The shape of a suspended cable under its own weight is

Semi-circle

Parabolic

Cycloidal

Elliptical

Catenary

Correct! Wrong!

The angular acceleration of a flywheel decreases uniformly from 8 rad/sec2 to 2 rad sec2 in 6 sec at which time its angular velocity is 42 rad/sec. The initial angular velocity was

3 rad/sec

6 rad/sec

12 rad/sec

30 rad/sec

Correct! Wrong!

The slope on the road generally provided on the curves is known as

Angle of repose

Angle of friction

Angle of banking

Angle of reaction

Correct! Wrong!

The radius of gyration of a solid sphere of radius r is equal to

0.8 r2

0.5 r2

0.4 r2

0.2 r2

Correct! Wrong!

The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as

Nowton's law

Corollary to Newton's laws of motion

Mohr's principle

D' Alembert's principle

Principle of dynamics

Correct! Wrong!

If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum?

Heavy body

Light body

Both have equal momentum

Momentum depends on velocities

Nothing can be concluded on the basis of information provided

Correct! Wrong!

A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is

i + j + k

Zero

2i + 3j

i - j - k

i + j

Correct! Wrong!

The law of conservation of mechanical energy is valid

Irrespective of the nature of force field

Only in gravitational field

Only if the total work done by the particle in moving around in a closed trajectory is zero

Only if the force is tangential to the trajectory

None of the above

Correct! Wrong!

The weight of an object will be maximum when it is placed at

North pole

South pole

Equator

Centre of earth

Any of the above locations

Correct! Wrong!

A particle in SHM while passing through mean position will have

maximum kinetic energy and maximum potential energy

maximum kinetic energy and minimum potential energy

minimum kinetic energy and maximum potential energy

average kinetic energy and average potential energy

Correct! Wrong!

The torque acting on a system is zero. Which of the following will be conserved?

Linear momentum

Angular momentum

Moment of inertia

Angular velocity

Correct! Wrong!

If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm

the angular velocity will decrease

his moment of inertia will decrease

the angular velocity will remain constant

the angular momentum will increase

Correct! Wrong!

The excape velocity for the moon is nearly

11.2 km/s

5 km/s

2.4 km/s

1.1 km/s

Correct! Wrong!

If three non-parallel forces hold a rigid body in equilibrium, they must

be equal in magnitude

be concurrent

be non-coneurrent

be colinear

Correct! Wrong!

A flywheel 200 cm in diameter is rotating at 100 rpm. A point on the rim of the flywheel will not have

angular velocity

centripental acceleration

tangential acceleration

all of the above

Correct! Wrong!

If w is the angular velocity of the pulley and T1 and T2 are tensions of driving and driven side then power transmitted equals

(T1 + T2) w

(T1 - T2) w

wT1

(T1 + 2T2) w

Correct! Wrong!

A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of

48.300 ft

56,900 ft

65,800 ft

75,000 ft

Correct! Wrong!

Which of the following bearing will have least coefficient of friction

Self aligury bearing

Cylinderical roller bearing

Thrust ball bearing

Single ball bearing

Tapered bearing

Correct! Wrong!

If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm

the angular velocity will decrease

his moment of inertia will decrease

the angular velocity will remain constant

the angular momentum will increase

Correct! Wrong!

Secondary stresses may be set up in frame due to any of the following reasons EXCEPT :

rigidity of the members

eccentricity of connections

self-weight of the members

members not being straight

Correct! Wrong!

MECHANICAL ENGINEERING APPLIED MECHANICS MCQs

A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he

Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be

The forces which meet at one point but their lines of action do not lie in one plane, are called

A particle is moving in Simple Harmonic Motion in a simple pendulum with some period of oscillation. Now in order to double the period of oscillation

A bob of simple pendulum oscillating in air is made to oscillate in oil. The time period will

A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be

A particle in simple Harmonic Motion while passing through mean position will have

A jet engine works on the principle of

A body in Simple Harmonic Motion will attain maximum velocity when it passes through

The centre of gravity of a plane lamina will not be at its geometrical centre if it is a

The necessary condition of equilibrium of a body is

When a body moves round a fixed axis it will have

A rigid body is suspended vertically at a point and oscillates with a small amplitude under the action of the force of gravity. Such an arrangement is called

The motion of a bicycle wheel is

A cannon of weight 10 tonnes fires a shell of 50 kg with a muzzle velocity of 900 m/sec at an angle of 30?. The time taken for the shell to emerge from the barrel is 0.004 sec. The velocity of the cannon would be

A body of weight W is resting at a plane inclined at 30? to the horizontal. It is attached to a string making an angle of 60? with horizontal. If the angle of friction be 30? the tension in the string would be

The earth's gravitational force field is said to be conservative force field because

The tension in the wire rope supporting a lift moving with a uniform velocity

The maximum frictional force which comes into play when a body just begins to slide over the surface of another body is known as

The angle of friction is

The coefficient of friction is

The shape of a suspended cable under its own weight is

The angular acceleration of a flywheel decreases uniformly from 8 rad/sec2 to 2 rad sec2 in 6 sec at which time its angular velocity is 42 rad/sec. The initial angular velocity was

The slope on the road generally provided on the curves is known as

The radius of gyration of a solid sphere of radius r is equal to

The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all particles-is known as

If two bodies one light and one heavy have equal kinetic energies, which one has a greater momentum?

A force F = 2i + 3j - k is passing through the origin. Its moment about point (1, 1, 0) is

The law of conservation of mechanical energy is valid

The weight of an object will be maximum when it is placed at

A particle in SHM while passing through mean position will have

The torque acting on a system is zero. Which of the following will be conserved?

If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm

The excape velocity for the moon is nearly

If three non-parallel forces hold a rigid body in equilibrium, they must

A flywheel 200 cm in diameter is rotating at 100 rpm. A point on the rim of the flywheel will not have

If w is the angular velocity of the pulley and T1 and T2 are tensions of driving and driven side then power transmitted equals

A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of

Which of the following bearing will have least coefficient of friction

If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm

Secondary stresses may be set up in frame due to any of the following reasons EXCEPT :

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