Online Mechanical Engineering Test - Engineering Mechanics Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as

principle of independence of forces

principle of resolution of forces

principle of transmissibility of forces

none of these

[#]

The above figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is

P/2

[#]

Coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

Yes

[#]

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity

v/2

v/4

v/8

[#]

The centre of gravity of an is osceles triangle with base (p) and sides (q) from its base is

[#]

The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then

[#]

The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius.

Correct

Incorrect

[#]

The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)

h/2

h/3

h/4

h/6

[#]

The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)

α = 45° + φ/2

α = 45° - φ/2

α = 90° + φ

α = 90° - φ

[#]

10.

The loss of kinetic energy during inelastic impact, is given by(where m₁ = Mass of the first body,m₂ = Mass of the second body, and u₁ and u₂ = Velocities of the first and second bodies respectively.)

[#]

11.

The forces which do not meet at one point and their lines of action do not lie on the same plane are known as

coplaner concurrent forces

coplaner non-concurrent forces

non-coplaner concurrent forces

none of these

[#]

12.

The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is

mr²/3

2mr²/3

2mr²/5

3mr²/5

[#]

13.

The velocity ratio for the second system of pulleys is n.

True

False

[#]

14.

When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

Yes

[#]

15.

The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.

lie

do not lie

[#]

16.

A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act

towards the wall at its upper and

away from the wall at its upper end

downward at its upper end

upward at its upper end

[#]

17.

Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.

will

will not

[#]

18.

A body is said to move or vibrate with simple harmonic motion if its acceleration is directed towards the mean position.

True

False

[#]

19.

Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.

Correct

Incorrect

[#]

20.

The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s², is

20N

100N

500N

none of these

[#]

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Online Mechanical Engineering Test - Engineering Mechanics Test

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