The resultant of a force acting on a body will be zero, if the body a.Rotates with uniform acceleration b.Moves along a curved path c.Rotates d.Does not rotate e.Rotates with uniform deceleration

1 Answer

Answer :

d. Does not rotate

Related questions

Description : If air resistance is neglected, at the mid-point of its swing, the acceleration of the bob of a simple pendulum along its path is always a.Increasing b.Zero c.A cycloid d.Decreasing e.A minimum but not equal to zero

Last Answer : d. Decreasing

Description : The piston of a steam engine moves in S.H.M. The crank rotates at 180 r.p.m. and the stroke length is 2 metres. The linear velocity of the piston when it is at a distance of 1 metre from the centre is a.8.88 m/sec b.16.32 m/sec c.5.88 m/sec d.8.16 m/sec e.Zero

Last Answer : e. Zero

Description : Which of the following statement is false? a.The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant) b.The linear velocity of ... zag path while ascending a steep hill e.The density of milk decreases when cream is taken out of milk

Last Answer : e. The density of milk decreases when cream is taken out of milk

Description : The centre of percussions is a.The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis b.The point of application of the resultant ... .The point in a body about which it can rotate horizontally and oscillates under the influence of gravity

Last Answer : a. The point of application of the resultant of all the forces tending to cause a body to rotate about a central axis

Description : The number of revolutions through which a pulley will rotate from rest if its angular acceleration is increased uniformly from zero to 12 rad per sec2 during 4 sec and then uniformly decreased to 0 rad per sec2 during the next 3 sec would be a.46.4 b.26.74 c.11.6 d.3.2 e.17.7

Last Answer : b. 26.74

Description : A block slides down a frictionless incline making an angle ? with an elevator floor. The acceleration relative to the incline will be maximum when a.the elevator ascends at constant speed v b. ... speed v c.107 dynes d.elevator descends with deceleration a e.the elevator descends with acceleration a

Last Answer : d. elevator descends with deceleration a

Description : A grinding wheel is rotating at 3000 rpm. When the switch is turned off the wheel stops in 10 seconds. The uniform deceleration of the wheel was a.1 rad/s2 b.31.4 rad/s2 c.4 rad/s2 d.62.8 rad/s2 e.10.4 rad/s2

Last Answer : b. 31.4 rad/s2

Description : Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is a.5000 J b.2500 J c.509.68 J d.None of the above e.Tapered bearing

Last Answer : d. None of the above

Description : The earth's gravitational force field is said to be conservative force field because a.The work acted by the earth's gravitational field on a particle is independent on the path traced out by ... directional component always acting normal to a body e.The value of gravitational force rise is fixed

Last Answer : a. The work acted by the earth's gravitational field on a particle is independent on the path traced out by the particle

Description : The statement the resultant of the external forces applied to a body (rigid or non-rigid) composed of a system of particles is equivalent to the vector summation of the effective forces acting on all ... motion b.Principle of dynamics c.D' Alembert's principle d.Nowton's law e.Mohr's principle

Last Answer : c. D' Alembert's principle

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... c.Indeterminate d.Determinate but depends on the acceleration of the cylinder e.None of the above

Last Answer : c. Indeterminate

Description : A uniform cylinder of weight W is rolling while slipping on a rough horizontal surface under the influence of a horizontal force. The force of friction between the cylinder and the surface is a. ... on the acceleration of the cylinder d.107 dynes e.Proportional to the coefficient of static friction

Last Answer : c. Determinate but depends on the acceleration of the cylinder

Description : Which one of the following is not the law of dry friction? a.If friction is neglected, the reactions are always normal to the surfaces on contact b.Friction always acts to oppose the relative motion of ... its maximum value d.The force of friction is always normal to the surface e.All of the above

Last Answer : d. The force of friction is always normal to the surface

Description : A rocket is fired vertically from the ground with a resultant vertical acceleration of 10 m/sec the fuel is finished in one minute and it continues to move up. The maximum height reached will be a.2 km b.20 km c.36 km d.10 km e.80 km

Last Answer : a. 2 km

Description : The statement --- if forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order then their resultant will be represented in magnitude and direction by the closing ... 's law of forces c.Law of polygon of forces d.D'Alembert's rule e.Lami's theorem

Last Answer : c. Law of polygon of forces

Description : When two forces acting at a point are such that if the direction of one is reversed, the direction of the resultant is turned through a right angle, the forces must be a.inclined at more than 90? b.inclined at less than 90? c.equal in magnitude d.acting at 180? e.107 dynes

Last Answer : c. equal in magnitude

Description : In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be a.21 N b.107 dynes c.2 N d.6 N e.

Last Answer : d. 6 N

Description : A particle starts from rest and moves in a straight line whose equation of motion is given by S = 2t3 - t2 - 1. The acceleration of the particle after one sec will be a.6 m/sec2 b.4 m/sec2 c.12 m/sec2 d.10 m/sec2 e.8 m/sec2

Last Answer : d. 10 m/sec2

Description : A wheel 8 mts in diameter coasts to rest from a speed of 800 rpm in 10 minutes. Its angular deceleration is a.308/min2 b.683 rad/min2 c.502 rad/min2 d.107 dynes e.809 rad/min2

Last Answer : c. 502 rad/min2

Description : An automobile is travelling at 25 m/s. It takes 0.3 second to apply the brakes after which the deceleration is 6 m/s2. How far, in meters, does the automobile travel before it stops? a.45 b.107 dynes c.40 d.50 e.60

Last Answer : e. 60

Description : When two concurrent and coplaner forces P and Q act at an angle of 180?, their resultant will be a a.moment equal to PQ b.couple c.(P-Q) d.107 dynes e.zero

Last Answer : c. (P-Q)

Description : A point moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one. The locus of the path traced by the point will be a a.Cycloid b.Hyperbola c.Circle d.Involute e.Ellipsc

Last Answer : d. Involute

Description : A cage weighing 200 kg is lowered down a mine shaft with uniform acceleration. In the first 5 sec the cage reaches a depth of 20 m. The tension in the cord lowering the cage would be a.836 kg b.167.2 kg c.100 kg d.41.8 kg e.200 kg

Last Answer : b. 167.2 kg

Description : A number of forces acting at a point will be in equilibrium if a.Sum of the forces is zero b.Algebraic sum of the forces is zero c.Sum of the resolved parts in any two perpendicular directions are both zero d.None of the above e.The metacentre of the body

Last Answer : d. None of the above

Description : The acceleration of a particular body is directly proportional to the resultant force acting on it & inversely proportional to its mass.  a. Pascal's Law  b. Joule's Law  c. Newton's Law  d. None of the above

Last Answer : Newton's Law

Description : The angle of friction is a.The angle which frictional force makes with the normal b.The anle at which the force applied from external souce will cause movement c.The angle at which fictional ... the normal reaction and the resultant of normal reaction and the limiting friction e.None of the above

Last Answer : d. The angle between the normal reaction and the resultant of normal reaction and the limiting friction

Description : The coefficient of friction is a.The tangent of the angle between the normal reaction and direction of limiting friction b.The tangent of the angle between the normal reaction and the resultant ... e.The angle between the normal reaction and the resultant of normal reaction and the limiting friction

Last Answer : a. The tangent of the angle between the normal reaction and direction of limiting friction

Description : Two forces of 6 and 8 kg act at right angles to each other, the resultant force will be a.100 b.28 c.41 d.14 e.10

Last Answer : e. 10

Description : A particle of mass M moves towards right with a velocity 2 V along the x-axis and another of mass 2 M with a velocity V towards left (- x axis). After the collision (they stick together on colliging) ... a.come to rest b.107 dynes c.move towards right d.may move in any direction e.move towards left

Last Answer : c. move towards right

Description : A particle moves along a rough plane inclined at 30? to the horizontal. The co-efficient of friction between the particle and the plane is 0.1. Its initial velocity is 15 m/sec. The ratio of the velocity of the particle when it move ... be in the regions a.8 ? 10 b.5 ? 7 c.2 ? 3 d.4 ? 6 e.10 ? 13

Last Answer : b. 5 ? 7

Description : If the resultant force acting on a body of constant mass is zero, the body's acceleration is: w) increasing x) decreasing y) always zero z) negative.

Last Answer : ANSWER: Y -- ALWAYS ZERO 

Description : Kinetic friction is a.Maximum value of frictional force when a body is about to move b.Friction between two well lubricated bodies c.Friction force acting when the body is in motion d.Driction force which keeps a body in motion e.None of the above

Last Answer : c. Friction force acting when the body is in motion

Description : The moment of a force is a.Equivalent to the algebraic sum of the moments acting on a body b.Equivalent to the sum of horizontal as well as vertical components of the moments on a body c.Equivalent ... of the moments on a body e.Equivalent to the vertical sum of the moments acting on a body

Last Answer : a. Equivalent to the algebraic sum of the moments acting on a body

Description : The limiting force of fiction is a.The friction force acting on a body when it is in motion b.The value of friction force which stops the movement of the body c.The value of friction force which ... d.The friction force acting when the body is just about to move e.Double of the normal friction

Last Answer : d. The friction force acting when the body is just about to move

Description : In which case power required would be more a.In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec b.In lowering a weight of 100 kg along an a inclined plane ... speed of 3 m/sec e.In lowering the weight at a velocity of 3 m/sec and acceleration of 1 m/sec2

Last Answer : a. In lifting up a weight of 100 kg at a velocity of 3 m/sec but accelerating upwards at 0.5 m/sec

Description : Our weight will be zero under all of the following conditions EXCEPT a.107 dynes b.We are at the centre of the earth c.When we are ascending in a lift with acceleration of 4.9 m/s2 d.We are orbiting in a satellite e.When we are freely faling

Last Answer : c. When we are ascending in a lift with acceleration of 4.9 m/s2

Description : The torque acting on a system is zero. Which of the following will be conserved? a.Angular velocity b.Linear momentum c.107 dynes d.Angular momentum e.Moment of inertia

Last Answer : d. Angular momentum

Description : A grinding wheel rotates at 3000 rpm. When power supply is cut off the wheel stops in 5 sec. The number of revolutions made by the wheel before coming to rest would be a.500 b.107 dynes c.250 d.3000 e.1000

Last Answer : c. 250

Description : A 2 m long shaft rotates about one end at 20 rad/s. It begins to accelerate with ? = 10 rads/s2. After how long, in seconds, will the velocity of the free end reach 100 m/s? a.3 b.107 dynes c.5 d.6 e.7

Last Answer : a. 3

Description : A grinding wheel rotates at 3000 rpm. When power supply is cut-off the wheel stops in 10 seconds. The number of revolutions made by the wheel before coming to rest would be a.1500 b.3000 c.1000 d.250 e.500

Last Answer : d. 250

Description : A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is a.500 KJ b.50.96 KJ c.101.92 KJ d.None of the above e.Tapered bearing

Last Answer : a. 500 KJ

Description : The force which produces an acceleration of 1 m/sec2 in a mass of 1 kg is called a.100 ergs b.one Newton c.one watt d.One erg e.one joule

Last Answer : b. one Newton

Description : Which of the following is scalar quantity a.Area of triangle b.Displacement of a particle c.Acceleration of car d.Force of friction e.Velocity a gear

Last Answer : a. Area of triangle

Description : A weight of 4.9 N rests on a rough horizontal floor that has a coefficient of friction of 0.5. If g = 9.8 m/s2, the smallest horizontal force that gives the weight an acceleration of 4m/s2 is most nearly a.2.5 N b.3 N c.2 N d.4.5 N e.4.9 N

Last Answer : d. 4.5 N

Description : The statement ---- if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two ---- is known as a.Law of polygon of forces b.D'Alembert's principle c.Newtons law of forces d.Lami's theorem e.Law of triangle of forces

Last Answer : d. Lami's theorem

Description : Let the only force acting on two bodies be their mutual interactions. If both bodies start from rest, the distances travelled by each will be a a.proportional to the respective masses of the ... masses of the bodies e.inversely proportional to the square of the respective masses of the bodies

Last Answer : c. inversely proportional to the respective masses of the bodies

Description : If the positive and negative shear force diagram areas are not equal, it can be concluded that a.shear force diagram has been wrongly drawn b.there is at least one couple acting on the beam c.107 dynes d.there are at least two maxima for bending moment e.bending moment does not change sign

Last Answer : b. there is at least one couple acting on the beam

Description : A couple consists of a force P acting at a point A whose coordinates are (-1,2,4) m and force - F acting at a point whose coordinates are (2,3, -2)m. If F = 3i + 2j - 4k in kg units the moment of the couple in kg - m ... .8i - 6j - 3k b.12i - 3j + k c.16i - 12j - 6k d.4i - 3j + k e.8i + 5j + 3k

Last Answer : a. 8i - 6j - 3k

Description : If the angle of friction is zero a body will experience a.Infinite friction b.Zero friction c.The force of friction will act normal to the plane d.The force of friction will act in the direction of motion e.None of the above

Last Answer : b. Zero friction

Description : In above problem the resultant reaction between the cannon and the ground would be a.1146 tonnes b.573 tonnes c.286.5 tonnes d.50 tonnes e.145 tonnes

Last Answer : b. 573 tonnes