ENGINEERING MECHANICS QUIZ

According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through center of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = Ah2 / IG

IP = IG / Ah2

IP = IG + Ah2

IP = IG - Ah2

TRUE ANSWER : ?
YOUR ANSWER : ?

The wheels of a moving car possess

Kinetic energy of translation and rotation both

Kinetic energy of translation only

Kinetic energy of rotation only

Potential energy only

TRUE ANSWER : ?
YOUR ANSWER : ?

The centre of gravity of a uniform lamina lies at

The centre of heavy portion

The midpoint of its axis

All of these

The bottom surface

TRUE ANSWER : ?
YOUR ANSWER : ?

Work done is said to be zero, when

No force acts on a body but some displacement takes place

None of these

Either (A) or (B)

Some force acts on a body, but displacement is zero

TRUE ANSWER : ?
YOUR ANSWER : ?

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

(p² - q²)/4

[√(4p² - q²)]/6

(4p² - q²)/6

(p² + q²)/4

TRUE ANSWER : ?
YOUR ANSWER : ?

A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.

Decrease

None of these

Not be effected

Increase

TRUE ANSWER : ?
YOUR ANSWER : ?

If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

(u₂ + u₁)/(v₂ + v₁)

(v₁ - v₂)/(u₁ - u₂)

(v₂ - v₁)/(u₁ - u₂)

(u₁ - u₂)/(v₁ - v₂)

TRUE ANSWER : ?
YOUR ANSWER : ?

The total energy possessed by a system of moving bodies

Is constant at every instant

Is maximum in the start and minimum at the end

Is minimum in the start and maximum at the end

Varies from point to point

TRUE ANSWER : ?
YOUR ANSWER : ?

The velocity ratio for the third system of pulleys is

2n - 1

n²

n

2n

TRUE ANSWER : ?
YOUR ANSWER : ?

Mass moment of inertia of a thin rod about its one end is ___________ the mass moment of inertia of the same rod about its mid-point

Same as

Twice

Thrice

Four times

TRUE ANSWER : ?
YOUR ANSWER : ?

↑