Turning Effect of Forces – MCQ’s
- 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
- If the direction of parallel forces is the same, then these are called ——————– forces:
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(b) Like Parallel ✓
(c) Unlike Parallel
(d) All of above
- 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
- Addition of vectors are done by:
(a) Head to tail rule ✓
(b) Left hand rule
(c) Right hand rule
(d) None of above
- 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 ✓
- 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
- Value of sin 300:
(a) 0.5 ✓
(b) 0.866
(c) 0.707
(d) none of them
- During rotation the particles of the body rotate along fixed circles. The straight line joining the centres of these circles is known as:
(a) Parallel line
(b) Axis of rotation ✓
(c) Both a & b
(d) None of above
- The rotational effect of a body is measured by a quantity known as:
(a) Acceleration
(b) Velocity
(c) Displacement
(d) Torque ✓
- The rotation produced in a body depends upon ———– factors:
(a) 1
(b) 2 ✓
(c) 3
(d) 4
- Torque is a ————— quantity:
(a) Base
(b) Vector ✓
(c) Scalar
(d) Both a & b
- The direction of torque is determined by —————– rule:
(a) Left hand
(b) Right hand ✓
(c) Both a & b
(d) None of above
- If the rotation produced in anticlock wise direction then the torque is taken as:
(a) Positive ✓
(b) Negative
(c) Opposite
(d) Perpendicular
- If the rotation is produced in clock wise direction then the torque is taken as:
(a) Positive
(b) Negative ✓
(c) Opposite
(d) Perpendicular
- 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
- In System International, the unit of torque is:
(a) N
(b) Nm-2
(c) Nm-1
(d) Nm ✓
- The force which is acting perpendicularly downwards towards the earth is called:
(a) Torque
(b) Weight
(c) Force of gravity
(d) Both b & c ✓
- 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
- The position of the centre of gravity depends upon the —– of the body:
(a) Size
(b) Shape ✓
(c) Weight
(d) Force
- 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
- The centre of gravity of a regular shaped body is always on its centre of —————–:
(a) Body
(b) Symmetry ✓
(c) Medians
(d) Axis
- 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
- 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
- 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 ✓
- A ———— 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
- 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
- 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 ✓
- There are ————- conditions of equilibrium: (LHR 2013)
(a) 1
(b) 2 ✓
(c) 3
(d) 4
- 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
- According to First condition of equilibrium, the sum of all the forces acting on the body should be —————–:
(a) Positive
(b) Zero ✓
(c) None
(d) All of above
- First condition of equilibrium is represented by:
(a) ∑F = 0
(b) ∑Fx = 0
(c) ∑Fy = 0
(d) All of above ✓
- 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
- Second condition of equilibrium is represented by:
(a) ∑τ = 0 ✓
(b) ∑F = 0
(c) Both a & b
(d) All of above
- Sigma (∑) is the Greek letter which is used to represent:
(a) Addition ✓
(b) Subtraction
(c) Multiplication
(d) Division
- There are ———— states of equilibrium:
(a) 1
(b) 2
(c) 3 ✓
(d) 4
- The equilibrium in which the body comes back to its original condition when set free after slightly lifting from one side is ——— equilibrium:
(a) Stable ✓
(b) Unstable
(c) Neutral
(d) None of above
- The equilibrium in which the body does not come back to its original condition when set free after slightly lifting from one side is ——— equilibrium:
(a) Stable
(b) Unstable ✓
(c) Neutral
(d) None of above
- The type of equilibrium in which after disturbance, the body again comes to rest position and center of gravity remains unchanged:
(a) Stable
(b) Unstable
(c) Neutral ✓
(d) None of above
- In Stable equilibrium, the centre of gravity is ———— than the original position:
(a) Raised ✓
(b) Lowered
(c) Remain same
(d) All of above
- In Unstable equilibrium, the centre of gravity is ———— than the original position:
(a) Raised
(b) Lowered ✓
(c) Remain same
(d) All of above
- In Neutral equilibrium, the centre of gravity ———— than the original position:
(a) Raised
(b) Lowered
(c) Remain same ✓
(d) All of above
- When an object is resting on the smooth horizontal surface, the weight of the object is balanced by ——————–:
(a) Normal Reaction ✓
(b) Torque
(c) Friction
(d) Couple
- A meter rod on a wedge is an example of ———— equilibrium
(a) Stable
(b) Unstable ✓
(c) Neutral
(d) None of above
- A book lying on the table is an example of —————– equilibrium:
(a) Stable ✓
(b) Unstable
(c) Neutral
(d) None of above
- Motion of the football on the ground is an example of ——- equilibrium:
(a) Stable
(b) Unstable
(c) Neutral ✓
(d) None of above
- The ———— of a racing car is kept low to make its stable:
(a) Width
(b) Height ✓
(c) Length
(d) Weight
- 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
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Longer moment arm can reduce