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# TURNING EFFECTS OF FORCE

Encircle the most appropriate answer from the following options :

1.         If a number Of forces act on a body such that their points of action are different but lines of action are parallel to each other then these forces are known as forces:

(a) Same

(b) Parallel

(c) Perpendicular

(d) None of above

2.         If the direction of parallel forces is the same, then these are called forces:

(a) Same

(b) Like Parallel

(c) Unlike Parallel

(d) All of above

3.         If the direction of parallel forces is the opposite, then these are called  forces:

(a) Same

(b) Like Parallel

(c) Unlike Parallel

(d) All of above

4.         Addition of vectors are done by:

(b) Left hand rule

(c) Right hand rule

(d) None of above

5.         Component of a vector acting along the x — axis is called:

(a) x — component

(b) horizontal component

(c) vertical component

(d) both a and b

6.         component of a vector acting along the y — axis is called:

(a) x — component

(b) horizontal component

(c) vertical component

(d) both a and b

7.       Value of sin 300 :

(a) 0.5

(b) 0.866

(c) 0 707

(d) none of them

8.         During the rotation the particles of the body rotate along fixed circles. The straight line joining the centres of these circles is called :

(a) Parallel line

(b) Axis of rotation

(c) Both a & b

(d) None Of above

9.         The rotational effect of a body is measured by a quantity known as:

(a) Acceleration

(b) Velocity

(c) Displacement

(d) Torque

10.       The rotation produced in a body depends upon  __ factors:

(a) 1

(b) 2

(c) 3

(d) 4

11.       Torque is a  quantity:

(a) Base

(b) Vector

(c) Scalar

(d) Both a & b

12.       The direction of torque is determined by:

(a) Left hand

(b) Right handrule

(c) Both a & b

(d) None of above

13.       If the rotation produced in anticlockwise direction then the torque is taken as:

(a) Positive

(b) Negative

(c) Opposite

(d) Perpendicular

14.       If the rotation is produced in clock wise direction then the torque is taken as:

(a) Positive

(b) Negative

(c) Opposite

(d) Perpendicular

15.       According to right hand rule, if  is along the curl of the fingers of the right hand then the thumb points in the direction of the torque:

(a) Rotation

(b) Parallel

(c) Force

(d) Weight

16.       In System International, the unit of torque is:

(a) N

(b) Nm-2

(c) Nm2

(d) Nm

17.       The force which is acting perpendicularly downwards towards the earth is called:

(a) Torque

(b) Weight

(c) Force of gravity

(d) Both b & c

18.       The point at which whole weight of the body appears to act is called:

(a) Origin

(b) Couple

(c) Centre of Gravity

(d) Reference point

19.       The position of the centre of gravity depends upon the         of the body:

(a) Size

(b) Shape

(c) Weight

(d) Force

20.       The centre of gravity of parallelogram, rectangle, square is the:

(a) Point of intersection of the medians

(b) Central point of axis

(c) Point of intersection of the diagonals

(d) Centre of parallelogram

21.       The centre of gravity of a regular shaped body is always on its centre of —————–:

(a) Body

(b) Symmetry

(c) Medians

(d) Axis

22.       The centre of gravity of triangle is the:

(a) Point of intersection of the medians

(b) Central point of axis

(c) Point of intersection of the diagonals

(d) Centre of parallelogram

23.       The centre of gravity of cylinder is the:

(a) Point of intersection of the medians

(b) Central point of axis

(c) Point of intersection of the diagonals

(d) Centre of parallelogram

24.       When two equal, opposite and parallel forces act at two points of the same body, they form a:

(a) Torque

(b) Moment of a couple

(c) Force

(d) Couple

25.             is always acting while opening or closing water tap, a lock, stopper of a bottle or jar:

(a) Couple

(b) Weight

(c) Force

(d) Mass

26.       The perpendicular distance between the line of action of force and centre of rotation and denoted by ‘r’ is called:

(a) Centre of gravity

(b) Moment arm

(c) Displacement

(d) Force

27. The torque produced in a body due to a couple is equal to the product of one of the forces and the

(a) Couple

(b) Force

(c) Like parallel force

(d) Couple arm

28.       There are                      conditions of equilibrium:

(a) 1

(b) 2

(c) 3

(d) 4

29.       When the sum of all the force acting on a body is zero or the object is moving with uniform velocity then it will be in

(a) Rest

(b) Motion

(c) Equilibrium

(d) None of above

30.       According to First condition of equilibrium, the total of all the forces acting on the body should be —

(a) Positive

(b) Zero

(c) None

(d) All of above

31.       According to Second condition of equilibrium, the sum of all the torques acting on the body should be — —

(a) Positive

(b) Zero

(c) None

(d) All of above

32.       Sigma (E) is the Greek letter which is used to represent:

(b) Subtraction

(c) Multiplication

(d) Division

33.       There are ——-——- states of equilibrium:

(a) 1

(b) 2

(c) 3

(d) 4

34.       The equilibrium in which the body conics back to its original condition when sct free after slightly lifting frotn one side is — equilibrium:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of’ above

35.       The equilibrium in which the body does not conue back to its original condition when set free after slightly lifting front one side is equilibrium:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of above

36.       The type of equilibrium in which after  disturbance, the body again conies to rest position and center of gravity remains unchanged:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of above

37.       In Stable equilibrium, the centre of gravity     ——- than (he original position:

(a) Raised

(b) Lowered

(c) Reina In satna

(d) All of above

38.       In Unstable equilibrium, the centre of gravity is   than the original position:

(a) Raised

(b) Lowered

(c) Remain satne

(d) All or above

39.       In Neutral equilibrium, the centre of gravity   than..? original position:

(a) Raised

(b) Lowered

(c) Retnain sallie

(d) All of above

40.       When an object is resting on the smooth horizontal surface, the weight or the object is balanced by –

(a) Nonnal Reaction

(b) Torque

(c) Friction

(d) Couple

41.       A meter rod on a wedge is an example of what in equilibrium

(a) Stable

(b) Unstable

(c) Neutral

(d) None

42.       A book lying on the table is an example of   equilibrium:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of above

43.       Motion of the football on the ground is an example of ——- equilibrium:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of above

44.       The _  of a racing car is kept low to make its stable:

(a) Width

(b) Height

(c) Length

(d) Weight

45.       If the centre of gravity of the body is below the fulcrum then the body will be in  equilibrium:

(a) Stable

(b) Unstable

(c) Neutral

(d) None of above