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Which of the following statement is correct?

A. The kinetic energy of a body during impact remains constant.

B. The kinetic energy of a body before impact is equal to the kinetic energy of a body after impact.

C. The kinetic energy of a body before impact is less than the kinetic energy of a body after impact.

D. The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.

Correct Answer :

D. The kinetic energy of a body before impact is more than the kinetic energy of a body after impact.


Related Questions

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Two forces are acting at an angle of 120°. The bigger force is 40 N and the resultant is perpendicular to the smaller one. The smaller force is

A. 20 N

B. 40 N

C. 120 N

D. None of these

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A cable with a uniformly distributed load per horizontal meter run will take the following shape

A. Straight line

B. Parabola

C. Hyperbola

D. Elliptical

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The velocity of a particle moving with simple harmonic motion is __________ at the mean position.

A. Zero

B. Minimum

C. Maximum

D. None of these

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A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.

A. Equal to

B. Less than

C. Greater than

D. None of these

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The range of projectile (R) on an upward inclined plane is

A. g. cos² β/2u². sin (α + β). cos α

B. 2u². sin (α + β). cos α/g. cos² β

C. g. cos² β/2u². sin (α - β). cos α

D. 2u². sin (α - β). cos α/g. cos² β

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One kg force is equal to

A. 7.8 N

B. 8.9 N

C. 9.8 N

D. 12 N

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Static friction is always __________ dynamic friction.

A. Equal to

B. Less than

C. Greater than

D. None of these

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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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The forces, whose lines of action are parallel to each other and act in the same directions, are known as

A. Coplanar concurrent forces

B. Coplanar non-concurrent forces

C. Like parallel forces

D. Unlike parallel forces

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Which of the following do not have identical dimensions?

A. Momentum and impulse

B. Torque and energy

C. Torque and work

D. Moment of a force and angular momentum.

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If n = number of members and y = number of joints, then for a perfect frame, n = ?

A. 1/2

B. 2/3

C. 3/2

D. 2/4

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4

The maximum height of a projectile on a horizontal plane, is

A. u² sin²α/2g

B. u² cos²α/2g

C. u² sin²α/g

D. u² cos²α/g

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Center of percussion is

A. The point of C.G.

B. The point of metacenter

C. The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

D. Point of suspension

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The unit of force in S.I. units is

A. kilogram

B. Newton

C. Watt

D. Dyne

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The total motion possessed by a body, is called

A. Impulsive force

B. Mass

C. Weight

D. Momentum

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In a framed structure, as shown in the below figure, the force in the member BC is

A. W/√3 (compression)

B. W/√3 (tension)

C. 2W/√3 (compression)

D. 2W/√3 (tension)

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The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.

A. Equal to

B. Less than

C. Greater than

D. None of these

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If three forces acting in different planes can be represented by a triangle, these will be in

A. Non-equilibrium

B. Partial equilibrium

C. Full equilibrium

D. Unpredictable

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If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion,

A. P + m.a = 0

B. P - m.a = 0

C. P × m.a = 0

D. P/m.a = 0

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According to principle of moments

A. If a system of coplanar forces is in equilibrium, then their algebraic sum is zero

B. If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero

C. The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point

D. Positive and negative couples can be balanced

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Which of the following statement is correct in connection with projectiles?

A. A path, traced by a projectile in the space, is known as trajectory.

B. The velocity, with which a projectile is projected, is known as the velocity of projection.

C. The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.

D. All of the above

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In the shown figure, if the angle of inclination of the plane is increased, then acceleration of the system will

A. Increase

B. Decrease

C. Remain the same

D. None of these

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

A. P = Q

B. Q = R

C. Q = 2R

D. None of these

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Centre of gravity of a thin hollow cone lies on the axis at a height of

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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Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the width (b), is

A. db³/12

B. bd³/12

C. db³/36

D. bd³/36

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The term 'Centroid' is

A. The same as centre of gravity

B. The point of suspension

C. The point of application of the resultant of all the forces tending to cause a body to rotate about a certain axis

D. None of the above

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A couple produces

A. Translatory motion

B. Rotational motion

C. Combined translatory and rotational motion

D. None of the above

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The maximum efficiency of a screw jack is

A. (1 - sinφ)/(1 + sinφ)

B. (1 + sinφ)/(1 - sinφ)

C. (1 - tanφ)/(1 + tanφ)

D. (1 + tanφ)/(1 - tanφ)

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According to Newton's first law of motion,

A. Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force

B. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

C. To every action, there is always an equal and opposite reaction

D. None of the above

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The centre of gravity of a triangle lies at the point of

A. Concurrence of the medians

B. Intersection of its altitudes

C. Intersection of bisector of angles

D. Intersection of diagonals