Home
Current Affairs January 2024

What is the correct answer?

4

If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with

A. A uniform retardation

B. A uniform acceleration

C. A variable acceleration

D. A variable retardation

Correct Answer :

C. A variable acceleration


Related Questions

What is the correct answer?

4

The motion of a bicycle wheel is

A. Translatory

B. Rotary

C. Rotary and translatory

D. Curvilinear

What is the correct answer?

4

The condition of equilibrium for any system of forces in a plane is

A. That polygon of forces must close

B. That resultant couple must be zero

C. Both (A) and (B)

D. None of the above

What is the correct answer?

4

The maximum velocity of a body vibrating with a simple harmonic motion of amplitude 150 mm and frequency 2 vibrations/sec, is

A. 188.5 m/sec

B. 18.85 m/sec

C. 1.885 m/sec

D. 0.18845 m/sec

What is the correct answer?

4

A particle is executing simple harmonic motion in a line 1.0 m long. If the time of one complete vibration is 1 sec, then the maximum velocity of the particle is

A. 1.00 m/sec

B. 1.57 m/sec

C. 3.14 m/sec

D. 6.28 m/sec

What is the correct answer?

4

A ball is dropped from a height of 16 m on a horizontal floor. If it rebounds to a height of 9 m after striking the floor, the coefficient of restitution between ball and floor is

A. 1/4

B. 2/3

C. 3/4

D. 4/3

What is the correct answer?

4

A hoop of radius 3 m weighs 100 kg. It rolls along a horizontal floor so that at its centre of mass has a speed of 200 mm/sec. The work required to stop the hoop is

A. 2 J

B. 4 J

C. 6 J

D. 8 J

What is the correct answer?

4

A pilot flies a small plane in a vertical loop of radius r. At the top of its trajectory he experiences weightlessness. If the acceleration due to gravity is g, the speed of the plane at the top of its trajectory would be

A. Zero

B. Infinite

C. gr

D. 2gr

What is the correct answer?

4

If the velocity of projection is 4 m/sec and the angle of projection is α°, the maximum height of the projectile from a horizontal plane, is

A. u² cos² α/2g

B. u² sin² α/2g

C. u² tan² α/2g

D. u² sin 2α/2g

What is the correct answer?

4

Free body diagram is an

A. Isolated joint with only body forces acting on it

B. Isolated joint with internal forces acting on it

C. Isolated joint with all the forces, internal as well as external, acting on it

D. None of the above

What is the correct answer?

4

Maximum efficiency of a screw jack for the angle of friction θ, is

A. sin θ/(1 + sin θ)

B. (1 - sin θ)/sin θ

C. (1 + sin θ)/(1 - sin θ)

D. (1 - sin θ)/(1 + sin θ)

What is the correct answer?

4

Pick up the correct statement from the following for the structure shown in below figure.

A. The horizontal reaction at A is 2 √3t ←

B. The horizontal reaction at C is 2 √3t →

C. The vertical reaction at A is zero

D. All the above

What is the correct answer?

4

A disc of mass 4 kg, radius 0.5 m and moment of inertia 3 kgm² rolls on a horizontal surface so that its center moves with speed 5 m/see. Kinetic energy of the disc is

A. 50 J

B. 150 J

C. 200 J

D. 400 J

What is the correct answer?

4

A stone is whirled in a vertical circle, the tension in the string, is maximum

A. When the string is horizontal

B. When the stone is at the highest position

C. When the stone is at the lowest position

D. At all the positions

What is the correct answer?

4

If a body is acted upon by a number of coplanar non-concurrent forces, it may

A. Rotate about itself without moving

B. Move in any one direction

C. Move in any one direction rotating about itself

D. All the above

What is the correct answer?

4

The characteristic of a couple is:

A. Algebraic sum of forces, constituting a couple is zero

B. Algebraic sum of moments of forces, constituting a couple, about any point, is same

C. A couple can be never the balanced by a single force

D. All the above

What is the correct answer?

4

The locus of the instantaneous centre of a moving rigid body, is

A. Straight line

B. Involute

C. Centroid

D. Spiral

What is the correct answer?

4

For a simple pendulum, the period of one oscillation is

A. 2π √(l/2g)

B. 2π √(2g/l)

C. 2π √(l/g)

D. 2π √(g/2l)

What is the correct answer?

4

The maximum displacement of a particle executing S.H.M. corresponds to

A. Zero potential energy and maximum kinetic energy

B. Zero kinetic energy and maximum potential energy

C. Maximum kinetic energy and maximum potential energy

D. Minimum kinetic energy and minimum potential energy

What is the correct answer?

4

The resultant of two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then,

A. P = R

B. Q = R

C. P = Q

D. None of the above is correct

What is the correct answer?

4

If two forces of 3 kg and 4 kg act at right angles to each other, their resultant force will be equal to

A. 7 kg

B. 1 kg

C. 5 kg

D. None of these

What is the correct answer?

4

A cable loaded with 0.5 tonne per horizontal metre span is stretched between supports in the same horizontal line 400 m apart. If central dip is 20 m, the minimum tension in the cable, will be

A. 200 tonnes at the centre

B. 500 tonnes at the centre

C. 200 tonnes at the right support

D. 200 tonnes at the left support

What is the correct answer?

4

A projectile is fired with a velocity of 100.3 m/sec. at an elevation of 60°. The velocity attained by the projectile when it is moving at a height of 100 m, is

A. 70 m/sec

B. 75 m/sec

C. 80 m/sec

D. 90 m/sec

What is the correct answer?

4

A uniform pyramid and a uniform prism of same height lie with their base on the surface. Which is more stable?

A. Pyramid

B. Prism

C. Both equally stable

D. None of the above

What is the correct answer?

4

A force P of 50 N and another force Q of unknown magnitude act at 90° to each other. They are balanced by a force of 130 N. The magnitude of Q is

A. 60 N

B. 80 N

C. 100 N

D. 120 N

What is the correct answer?

4

Two loads of 50 kg and 75 kg are hung at the ends of a rope passing over a smooth pulley shown in below figure. The tension in the string is:

A. 50 kg

B. 75 kg

C. 25 kg

D. 60 kg

What is the correct answer?

4

The resultant of the forces acting on a body will be zero if the body

A. Rotates

B. Moves with variable velocity in a straight line

C. Moves along a curved path

D. Does not move at all

What is the correct answer?

4

The following is not a law of static friction:

A. The force of friction always acts in a direction opposite to that in which the body tends to move

B. The force of friction is dependent upon the area of contact

C. The force of friction depends upon the roughness of the surface

D. The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces

What is the correct answer?

4

The ratio of the ranges on the inclined plane with motion upward and with motion downward for a given velocity, angle of projection will be

A. sin (α + β)/sin (α - β)

B. sin (α - β)/sin (α + β)

C. cos (α - β)/cos (α + β)

D. tan (α - β)/tan (α + β)

What is the correct answer?

4

If a projectile is fired with an initial velocity of 10 m/sec at an angle of 60° to the horizontal, its horizontal and vertical velocity at the highest point of trajectory are

A. 0 and 5 m/sec

B. 5 m/sec and 0

C. 5√3 m/sec and 0

D. 5 and 5√3 m/sec

What is the correct answer?

4

A block in the shape of a parallelepiped of sides 1m × 2m × 3m lies on the surface. Which of the faces gives maximum stable block?

A. 1 m × 2 m

B. 2 m × 3 m

C. 1 m × 3 m

D. Equally stable on all faces