2 DECEMBER 2020 CURRENT AFFAIRS QUIZ

The resolved part of the resultant of two forces inclined at an angle 'θ' in a given direction is equal to

The algebraic sum of the resolved parts of the forces in the given direction

The sum of the resolved parts of the forces in the given direction

The difference of the forces multiplied by the cosine of θ

The sum of the forces multiplied by the sine of θ

TRUE ANSWER : ?
YOUR ANSWER : ?

The velocity ratio of a differential wheel and axle with 'D' as the diameter of effort wheel and d1 and d2 as the diameters of larger and smaller axles respectively, is

D/(d₁ + d₂)

2D/(d₁ - d₂)

2D/(d₁ + d₂)

D/(d₁ - d₂)

TRUE ANSWER : ?
YOUR ANSWER : ?

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

90°

120°

30°

60°

TRUE ANSWER : ?
YOUR ANSWER : ?

The unit of angular acceleration is

rad/s2

m/s

N-m

m/s2

TRUE ANSWER : ?
YOUR ANSWER : ?

The law of the machine is (where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)

P = mW + C

P = mW - C

P = m/W + C

P = C - mW

TRUE ANSWER : ?
YOUR ANSWER : ?

The friction experienced by a body, when in motion, is known as

Rolling friction

Static friction

Limiting friction

Dynamic friction

TRUE ANSWER : ?
YOUR ANSWER : ?

Coefficient of friction depends upon

Nature of surface only

Both (A) and (B)

None of these

Area of contact only

TRUE ANSWER : ?
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A machine having an efficiency less than 50%, is known as

Non-reversible machine

Neither reversible nor non-reversible machine

Ideal machine

Reversible machine

TRUE ANSWER : ?
YOUR ANSWER : ?

The ratio of static friction to dynamic friction is always

None of these

Less than one

Greater than one

Equal to one

TRUE ANSWER : ?
YOUR ANSWER : ?

The wheels of a moving car possess

Kinetic energy of translation and rotation both

Potential energy only

Kinetic energy of translation only

Kinetic energy of rotation only

TRUE ANSWER : ?
YOUR ANSWER : ?

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