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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. This statement is known as

A. Newton's first law of motion

B. Newton's second law of motion

C. Newton's third law of motion

D. None of these

Correct Answer :

B. Newton's second law of motion


Related Questions

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4

The rate of change of displacement of a body is called

A. Velocity

B. Acceleration

C. Momentum

D. None of these

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4

The frequency of oscillation of a compound pendulum is (where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

A. 2π. √(gh/kG² + h²)

B. 2π. √(kG² + h²/gh)

C. 1/2π. √(gh/kG² + h²)

D. 1/2π. √(kG² + h²/gh)

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4

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

A. Equal to

B. Less than

C. Greater than

D. Either (B) or (C)

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4

A smooth cylinder lying on a __________ is in neutral equilibrium.

A. Curved surface

B. Convex surface

C. Horizontal surface

D. None of these

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4

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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4

Which of the following is not the unit of power?

A. kW (kilowatt)

B. hp (horse power)

C. kcal/sec

D. kcal/kg sec

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4

Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

A. (BD³/12) - (bd³/12)

B. (DB³/12) - (db³/12)

C. (BD³/36) - (bd³/36)

D. (DB³/36) - (db³/36)

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4

The moment of inertia of a thin disc of mass m and radius r, about an axis through its centre of gravity and perpendicular to the plane of the disc is

A. mr2/2

B. mr2/4

C. mr2/6

D. mr2/8

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4

The moment of inertia of a solid sphere of mass m and radius r is

A. 2mr2/3

B. 2mr2/5

C. mr2

D. mr2/2

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4

The angle between two forces when the resultant is maximum and minimum respectively are:

A. 0° and 180°

B. 180° and 0°

C. 90° and 180°

D. 90° and 0°

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4

The amplitude is always __________ radius of the circle.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

According to law of triangle of forces

A. Three forces acting at a point will be in equilibrium

B. Three forces acting at a point can be represented by a triangle, each side being proportional to force

C. If three forces acting upon a particle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium

D. If three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

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4

The unit of force in S.I. system of units is

A. Dyne

B. Kilogram

C. Newton

D. Watt

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4

The unit of force in S.I. units is

A. kilogram

B. Newton

C. Watt

D. Dyne

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4

One joule means that

A. Work is done by a force of 1 N when it displaces a body through 1 m

B. Work is done by a force of 1 kg when it displaces a body through 1 m

C. Work is done by a force of 1 dyne when it displaces a body through 1 cm

D. Work is done by a force of 1 g when it displaces a body through 1 cm

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4

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

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

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

C. The difference of the forces multiplied by the cosine of θ

D. The sum of the forces multiplied by the sine of θ

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4

The units of moment of inertia of mass are

A. kg-m²

B. m²/kg.

C. kg/m²

D. kg/m

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4

In order to completely specify angular displacement by a vector, it must fix

A. Direction of the axis of rotation

B. Magnitude of angular displacement

C. Sense of angular displacement

D. All 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

The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)

A. α = 45° + φ/2

B. α = 45° - φ/2

C. α = 90° + φ

D. α = 90° - φ

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4

On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

A. Towards the wall at its upper end

B. Away from the wall at its upper end

C. Upwards at its upper end

D. Downwards at its upper end

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4

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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4

Kinetic friction is the

A. Tangent of angle between normal reaction and the resultant of normal reaction and the 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 a number of coplanar forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)

A. P = W tan (α - φ)

B. P = W tan (α + φ)

C. P = W tan (φ - α)

D. P = W cos (α + φ)

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4

The ratio of static friction to dynamic friction is always

A. Equal to one

B. Less than one

C. Greater than one

D. None of these

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4

The periodic time of one oscillation for a simple pendulum is (where l = Length of the pendulum.)

A. (1/2π). √(l/g)

B. (1/2π). √(g/l)

C. 2π. √(l/g)

D. None of these

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4

The length of a second's pendulum is

A. 94.9 cm

B. 99.4 cm

C. 100 cm

D. 101 cm

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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

When trying to turn a key into a lock, following is applied

A. Coplanar force

B. Non-coplanar forces

C. Moment

D. Couple