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Current Affairs January 2024

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4

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

A. Coplanar non-concurrent forces

B. Non-coplanar concurrent forces

C. Non-coplanar non-concurrent forces

D. Intersecting forces

Correct Answer :

B. Non-coplanar concurrent forces


Related Questions

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4

The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is

A. 3mr2/5

B. 3mr2/10

C. 2mr2/5

D. 4mr2/5

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4

The product of either force of couple with the arm of the couple is called

A. Resultant couple

B. Moment of the forces

C. Resulting couple

D. Moment of the couple

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4

If the body falls freely under gravity, then the gravitational acceleration is taken as

A. +8.9 m/s2

B. -8.9 m/s2

C. +9.8 m/s2

D. -9.8 m/s2

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4

The possible loading in various members of framed structures are

A. Compression or tension

B. Buckling or shear

C. Shear or tension

D. All of the above

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4

Limiting force of friction is the

A. Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction

B. Ratio of limiting friction and normal reaction

C. The friction force acting when the body is just about to move

D. The friction force acting when the body is in motion

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4

If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be

A. Same

B. Half

C. Double

D. None of these

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4

Which of the following is a scalar quantity?

A. Force

B. Speed

C. Velocity

D. Acceleration

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4

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

A. Directly

B. Inversely

C. Square root

D. None of these

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4

The angular velocity (in rad/s) of a body rotating at N revolutions per minute is

A. πN/60

B. πN/180

C. 2πN/60

D. 2πN/180

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4

The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of

A. Friction

B. Limiting friction

C. Repose

D. Kinematic friction

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4

A pendulum which executes one beat per second is known as

A. Simple pendulum

B. Compound pendulum

C. Torsional pendulum

D. Second's pendulum

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4

Work done is said to be zero, when

A. Some force acts on a body, but displacement is zero

B. No force acts on a body but some displacement takes place

C. Either (A) or (B)

D. None of the above

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4

The maximum efficiency of a lifting machine is

A. 1/m

B. V.R./m

C. m/V.R.

D. 1/(m × V.R.)

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4

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

A. v

B. v/2

C. v/4

D. v/8

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4

The motion of a particle round a fixed axis is

A. Translatory

B. Rotary

C. Circular

D. Translatory as well as rotary

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4

The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is

A. β/2

B. 30° + β/2

C. 45° + β/2

D. 60° + β/2

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4

Centre of gravity of a solid cone lies on the axis at the height

A. One fourth of the total height above base

B. One third of the total height above base

C. One-half of the total height above base

D. Three eighth of the total height above the base

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4

Moment of inertia is the

A. Second moment of force

B. Second moment of area

C. Second moment of mass

D. All of these

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4

The velocity ratio of a first system of pulleys with 4 pulleys is

A. 4

B. 8

C. 16

D. 20

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4

The process of finding out the resultant force is called __________ of forces.

A. Composition

B. Resolution

C. Decomposition

D. None of these

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4

Effect of a force on a body depends upon

A. Magnitude

B. Direction

C. Position or line of action

D. All of the above

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4

The coefficient of restitution for inelastic bodies is

A. Zero

B. One

C. Between zero and one

D. More than one

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4

In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.

A. Less than

B. Equal to

C. More than

D. None of these

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4

If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella

A. More inclined when moving

B. Less inclined when moving

C. More inclined when standing

D. Less inclined when standing

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4

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys

A. First

B. Second

C. Third

D. None of these

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4

Which of the following is not a vector quantity?

A. Weight

B. Velocity

C. Acceleration

D. Force

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4

The maximum acceleration of a particle moving with simple harmonic motion is

A. ω

B. ωr

C. ω2r

D. ω/r

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4

Angle of friction is the

A. Angle between normal reaction and the resultant of normal reaction and the limiting friction

B. Ratio of limiting friction and normal reaction

C. The ratio of minimum friction force to the friction force acting when the body is just about to move

D. The ratio of minimum friction force to friction force acting when the body is in motion

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4

Mass moment of inertia of a uniform thin rod of mass M and length (l) about its mid-point and perpendicular to its length is

A. (2/3) Ml2

B. (1/3) Ml2

C. (3/4) Ml2

D. (1/12) Ml2

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4

If the gravitational acceleration at any place is doubled, then the weight of a body will be

A. g/2

B. g

C. √2.g

D. 2g