Related Questions
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From a circular plate of diameter 6 cm is cut out a circle whose diameter is a radius of the plate. Find the e.g. of the remainder from the centre of circular plate
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A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is
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The maximum efficiency of a screw jack is
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The maximum acceleration of a particle moving with simple harmonic motion is
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The coefficient of restitution for inelastic bodies is
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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
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The efficiency of a screw jack is maximum, when (where α = Helix angle, and φ = Angle of friction.)
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A pair of smith's tongs is an example of the lever of
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Coulomb friction is the friction between
A. Bodies having relative motion
C. Two lubricated surfaces
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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
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The moment of inertia of a solid cone of mass m and base radius r about its vertical axis is
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The total motion possessed by a body, is called
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A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.
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The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be
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The coefficient of friction depends upon
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The forces, which meet at one point and their lines of action also lie on the same plane, are known as
A. Coplanar concurrent forces
B. Coplanar non-concurrent forces
C. Non-coplanar concurrent forces
D. Non-coplanar non-concurrent forces
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The moment of inertia of a square of side a about its diagonal is
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The force required to move the body up the plane will be minimum if it makes an angle with the inclined plane __________ the angle of friction.
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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
B. Twice the area of the triangle
C. Half the area of the triangle
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The units of moment of inertia of mass are
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If a number of forces act simultaneously on a particle, it is possible
A. Not a replace them by a single force
B. To replace them by a single force
C. To replace them by a single force through C.G.
D. To replace them by a couple
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The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called
A. Newton's first law of motion
B. Newton's second law of motion
C. Principle of conservation of energy
D. Principle of conservation of momentum
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If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
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The C.G. of a solid hemisphere lies on the central radius 3r
A. At distance from the plane base 3r
B. At distance from the plane base 3r
C. At distance from the plane base 3r
D. At distance from the plane base
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Which of the following are vector quantities?
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A force while acting on a body may
B. Balance the forces, already acting on it
C. Give rise to the internal stresses in it
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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.)
A. y = (gx²/2u² cos²α) + x. tanα
B. y = (gx²/2u² cos²α) - x. tanα
C. y = x. tanα - (gx²/2u² cos²α)
D. y = x. tanα + (gx²/2u² cos²α)
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Pick up the incorrect statement from the following:
A. The C.G. of a circle is at its centre
B. The C.G. of a triangle is at the intersection of its medians
C. The C.G. of a rectangle is at the intersection of its diagonals
D. The C.G. of a semicircle is at a distance of r/2 from the centre
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The time of flight of a projectile on downward inclined plane depends upon
B. Angle of inclination of the plane
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The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis. (where h = Height of a right circular solid cone.)