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1. The velocity ratio of a single purchase crab winch can be increased by
2. The forces, whose lines of action are parallel to each other and act in the same directions, are known as
3. According to Newton's first law of motion,
4. In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.
5. The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplaner concurrent forces.
6. A number of forces acting at a point will be in equilibrium, if
7. The unit of moment of inertia of an area is
8. The motion of a wheel of a car is
9. The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.
10. The velocity ratio of a differential wheel and axle with D as the diameter of effort wheel and d1,and d2 as the diameters of larger and smaller axles respectively, is
11. Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is
figure 11
12. The motion of the body from one extremity to the other is known as a beat.
13. The force induced in the string BC due to the load W as shown in the below figure is
figure 13
14. When a body of mass moment of inertia I (about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is
15. All the steel trusses of the bridges, have one of their end roller supported, and other end hinged. The main advantage of such a support is that the truss remains stable.
16. The force applied on a body of mass 100 kg to produce an acceleration of 5 m/s2, is
17. The time of flight of a projectile on downward inclined plane depends upon
18. A framed structure is not perfect, if the number of members are __________ (2j - 3), where j is the number of joints.
19. The centre of gravity of a rectangle lies at a point where its two diagonals meet each other.
20. Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.
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1. The ratio of static friction to dynamic friction is always
2. The unit of force in S.I. system of units is
3. The efficiency of a lifting machine is the ratio of
4. In order to determine the effects of a force, acting on a body, we must know
5. A body is said to move or vibrate with simple harmonic motion if its acceleration is directed towards the mean position.
6. Coefficient of friction depends upon
7. The moment of inertia of a solid cone of mass 'm' and base radius 'r' about its vertical axis is
8. Two blocks A and B of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.
figure 8
9. The force induced in the string AB due to the load W, as shown in the below figure is
figure 9
10. The kinetic energy of a body __________ upon its mass and velocity.
11. Non-coplaner non-concurrent forces are those forces which
12. A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body, and S = Sum of the squares of the two semi-axes.)
13. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.
14. One kg force is equal to
15. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
16. A force while acting on a body may
17. The Cartesian equation of trajectory is(where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)
18. The maximum displacement of a body, from its mean position is called amplitude.
19. A pendulum which executes one beat per second is known as
20. A screw jack used for lifting the loads is
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1. The slope on the road surface generally provided on the curves is known as
2. The term 'Centroid' is
3. The acceleration of a body sliding down an inclined surface is
4. Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is
5. A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act
6. Joule is the unit of
7. The negative acceleration is called retardation.
8. A ladder is resting on a smooth ground and leaning against a rough vertical wall. The force of friction will act
9. A force acting in the opposite direction to the motion of the body is called force of friction.
10. When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is
11. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ proportional to its mechanical advantage.
12. In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
figure 12
13. The length of a second's pendulum is
14. The moment of inertia of a square of side (a) about an axis through its centre of gravity is
15. D' Alembert's principle basically depends upon Newton's second law of motion.
16. Coplaner non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
17. For any system of coplaner forces, the condition of equilibrium is that the
18. The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is
19. The velocity ratio of a simple wheel and axle with 'D' and 'd' as the diameters of effort wheel and load axle, is
20. The wheels of a moving car possess
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1. When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ proportional to its acceleration.
2. The moment of the force P about O as shown in the below figure is
figure 2
3. If a body is acted upon by a number of coplaner non-concurrent forces, it may
4. The maximum mechanical advantage of a lifting machine is
5. The centre of gravity a T-section 100 mm x 150 mm x 50 mm from its bottom is
6. When a body falls freely under gravitational force, it possesses __________ weight.
7. An ideal machine is one whose efficiency is
8. The centre of gravity of a quadrant of a circle lies along its central radius (r) at a distance of
9. According to Lami's theorem
10. A machine having an efficiency greater than 50%, is known as
11. Moment of inertia is the
12. Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about X-X axis.
figure 12
13. The horizontal range of a projectile (R) is given by
14. In order to completely specify angular displacement by a vector, it must fix
15. The coefficient of restitution for inelastic bodies is
16. The impact between two lead spheres is approximately equal to an __________ impact.
17. Which of the following are vector quantities?
18. The energy possessed by a body, for doing work by virtue of its position, is called
19. Which of the following statement is correct in connection with projectiles?
20. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.
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1. The angle of inclination of the plane at which the body begins to move down the plane, is called
2. The law of the machine is(where P = Effort applied to lift the load, m = A constant which is equal to the slope of the line, W = Load lifted, and C = Another constant which represents the machine friction.)
3. 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,
4. The total motion possessed by a body, is called
5. The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.
6. The forces, which meet at one point and their lines of action also lie on the same plane, are known as
7. The matter contained in a body, is called
8. The amount by which the outer edge of the rail is raised, is known as super-elevation.
9. The potential energy stored by a spring in compression, is called strain energy.
10. If the resultant of a number of forces acting on a body is zero, then the body will be in equilibrium.
11. The S.I. unit of energy is
12. The centre of percussion is below the centre of gravity of the body and is at a distance equal to
13. The moment of a force
14. The friction experienced by a body, when at rest, is known as
15. If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
16. 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.)
17. The angle which the normal reaction makes with the resultant reaction is called angle of friction.
18. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
19. The moment of inertia of a solid sphere of mass m and radius r is
20. In a framed structure, as shown in the below figure, the force in the member AB is __________ the force in member AC.
figure 20
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1. The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.
2. A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The centre of gravity of the section will lie
figure 2
3. The maximum velocity of a particle moving with simple harmonic motion is
4. 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
5. The resultant of two equal forces P making an angle θ, is given by
6. The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
7. 1 joule means that
8. The ideal angle of banking provided on the curves on roads depends upon
9. The linear velocity of a body rotating at ω rad / s along a circular path of radius r is given by
10. A non-reversible machine is also called a self-locking machine.
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1. Coplaner concurrent forces are those forces which
2. When two elastic bodies collide with each other
3. The centre of gravity of a right angled triangle lies at its geometrical centre
4. The loss of kinetic energy due to direct impact of two bodies __________ upon the value of coefficient of restitution.
5. The force, by which the body is attracted, towards the centre of the earth, is called
6. The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is
7. A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.
8. The forces which do not meet at one point and their lines of action do not lie on the same plane are known as
9. Vectors method for the resultant force is also called polygon law of forces.
10. The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ω radian/s is given by
11. The time taken by a particle for one complete oscillation is known as periodic time.
12. If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.
13. Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its mid-point
14. When a person, on a bicycle, drives round a curve, he has to lean __________ to maintain equilibrium.
15. The unit of power in S.I. units is
16. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)
17. The velocity ratio of a first system of pulleys with 4 pulleys is
18. 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
19. Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is same as that about X-X axis.
figure 19
20. Two equal and opposite parallel forces whose lines of action are different form a couple.
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1. Work done is said to be zero, when
2. The distance, between the point of projection and the point where the projectile strikes the ground, is known as range.
3. When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as
4. The angle between two forces when the resultant is maximum and minimum respectively are
5. One watt is equal to
6. The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is known as
7. The equivalent length of a simple pendulum which gives the same frequency as compound pendulum is
8. During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.
9. Mass moment of inertia of a uni form thin rod of mass M and length (l) about its mid-point and perpendicular to its length is
10. If two blocks of equal mass are attached to the two ends of a light string and one of the blocks is placed over a smooth horizontal plane while the other is hung freely after passing over a smooth pulley, then the two blocks will have some motion.
11. The resultant of two forces P and Q acting at an angle θ is
12. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
13. 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
14. If a number of forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, then the forces are in equilibrium.
15. Which of the following are vector quantities?
16. The angular velocity (in rad / s) of a body rotating at N revolutions per minute is
17. Newton's second law motion __________ a relation between force and mass of a moving body.
18. The overturning of a vehicle on a level circular path can be avoided if the velocity of vehicle is __________ pi gra/h
19. The minimum force required to slide a body of weight W on a rough horizontal plane is
20. The maximum acceleration of a particle moving with simple harmonic motion is
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1. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to
2. The resultant of the two forces P and Q is R. If Q is doubled, the new resultant is perpendicular to P. Then
3. The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
4. The velocity ratio for the third system of pulleys is
5. When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.
6. The moment of inertia of a square of side a about its base is a4/ 3.
7. Frequency of vibrations means the number of cycles per second.
8. The time of flight (t) of a projectile on a horizontal plane is given by
9. The law of motion involved in the recoil of gun is
10. In order to double the period of simple pendulum, the length of the string should be
11. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.
12. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by
13. The velocity ratio for the second system of pulleys is n.
14. The centre of gravity of a triangle lies at a point where its medians intersect each other.
15. If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
16. If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
17. If the gravitational acceleration at any place is doubled, then the weight of a body will be
18. A machine which is not capable of doing any work in the reversed direction, after the effort is removed, is called a reversible machine.
19. Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)
20. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter is
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1. Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then
2. In a screw jack, the effort required to lower the load is __________ the effort required to raise the same load.
3. The total energy possessed by a system of moving bodies
4. The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad / s2, is
5. A framed structure is imperfect, if the number of members are __________ (2j - 3).
6. The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
7. The acceleration of a particle moving with simple harmonic motion is __________ at the mean position.
8. Energy may be defined as the capacity of doing work.
9. 1 joule is equal to
10. If the body falls freely under gravity, then the gravitational acceleration is taken as
11. The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is
12. Whenever a force acts on a body and the body undergoes a displacement, then
13. The periodic time (T) is given by(where ω = Angular velocity of particle in rad / s.)
14. A couple produces
15. For a self locking machine, the efficiency must be
16. The rate of change of displacement of a body is called
17. The terms 'leverage' and 'mechanical advantage' Of a compound lever have got the same meaning.
18. When a particle moves along a straight path, there will be centripetal acceleration as well as tangential acceleration.
19. A framed structure, as shown in the below figure, is a
figure 19
20. 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.)
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