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Civil Engineering [MCQS] Applied Mechanics Section -4

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1. A retarding force on a body does not




2. The unit of force in C.G.S. system of units, is called




3. A block of weight 50 kg is placed on a horizontal plane. When a horizontal force of 18 kg is applied, the block is just on the point of motion. The angle of friction is




4. From a circular plate of a diameter 6 cm is cut out a circle whose diameter is equal to the radius of the plate. The C.G. of the remainder from the centre of circular plate is at a distance of




5. The force which produces an acceleration of 1 m/sec2 in a mass of one kg, is called




6. A sphere is resting on two planes BA and BC which are inclined at 45° and 60° respectively with the horizontal. The reaction on the plane BA will be




7. A projectile is fired at an angle θ to the vertical. Its horizontal range will be maximum when θ is




8. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The mechanical advantage of the lifting machine is




9. One half of a vibration of a body, is called




10. On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts




11. The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed




12. From the circular plate of a diameter 6 cm is cut out a circular plate whose diameter is equal to radius of the plate. The c.g. of the remainder shifts from the original position through




13. In simple harmonic motion, acceleration of a particle is proportional to




14. A heavy ladder resting on a floor and against a vertical wall may not be in equilibrium, if




15. In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is




16. To double the period of oscillation of a simple pendulum




17. For a particle moving with a simple harrmonic motion, the frequency is




18. According to Kennedy's theorem, if three bodies have plane motions, their instantaneous centres lie on




19. A ball of mass 250 g moving on a smooth horizontal table with a velocity of 10 m/sec hits an identical stationary ball B on the table. If the impact is perfectly plastic, the velocity of the ball B just after impact would be




20. Energy may be defined as




21. A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight




22. Angular acceleration of a particle may be expressed as




23. A stone is whirled in a vertical circle, the tension in the string, is maximum




24. If a spherical body is symmetrical about its perpendicular axes, the moment of inertia of the body about an axis passing through its centre of gravity as given by Routh's rule is obtained by dividing the product of the mass and the sum of the squares of two semi-axes by n where n is




25. The angle of projection for a range is equal to the distance through which the particle would have fallen in order to acquire a velocity equal to the velocity of projection, will be




26. A particle executes a simple harmonic motion. While passing through the mean position, the particle possesses




27. Varigon's theorem of moments states




28. A smooth cylinder lying on its convex surface remains




29. A weight W is suspended at the free end of a light member hinged to a vertical wall. If the angle of inclination of the member with the upper wall is θ°, the force introduced in the member, is




30. A satellite goes on moving along its orbit round the earth due to




31. The phenomenon of collision of two elastic bodies takes place because bodies




32. A glass ball is shot to hit a wall from a point on a smooth floor. If the ball returns back to the point of projection in twice the time taken in reaching the wall, the coefficient of restitution between the glass ball and the wall is




33. Kinetic friction may be defined as