ENGINEERING MECHANICS QUIZ

During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

Less than

Equal and opposite to

Equal to

Greater than

TRUE ANSWER : ?
YOUR ANSWER : ?

Non-coplanar non-concurrent forces are those forces which

Meet at one point, but their lines of action do not lie on the same plane

None of these

Do not meet at one point and their lines of action do not lie on the same plane

Do not meet at one point but their lines of action lie on the same plane

TRUE ANSWER : ?
YOUR ANSWER : ?

According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

Their algebraic sum is zero

Their lines of action are at equal distances

The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

The algebraic sum of their moments about any point in their plane is zero

TRUE ANSWER : ?
YOUR ANSWER : ?

A particle inside a hollow sphere of radius r, having coefficient of friction µ can rest up to height of

r/3

r/A

0.134 r

r/2

TRUE ANSWER : ?
YOUR ANSWER : ?

A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of

4 m

3 m

1 m

2 m

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.

Not be effected

Increase

None of these

Decrease

TRUE ANSWER : ?
YOUR ANSWER : ?

For a self locking machine, the efficiency must be

1

Less than 50%

Equal to 50%

Greater than 50%

TRUE ANSWER : ?
YOUR ANSWER : ?

A framed structure is imperfect, if the numbers of members are __________ (2j - 3).

Less than

Greater than

Either (B) or (C)

Equal to

TRUE ANSWER : ?
YOUR ANSWER : ?

The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)

ω².√(y² - r²)

ω.√(r² - y²)

ω².√(r² - y²)

ω.√(y² - r²)

TRUE ANSWER : ?
YOUR ANSWER : ?

The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.

None of these

Inversely

Square root

Directly

TRUE ANSWER : ?
YOUR ANSWER : ?