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WorksheetsMachine Physics
Total questions: 25
Worksheet time: 19mins
Which of the statement is not true for a machine ?
It can multiply force
It can increase speed
It can change the direction of applied force.
Its output can be more than input.
Which of the statement is not true for an actual machine?
Its mechanical advantage is less than velocity ratio
Its efficiency is always less than 100%
Its mechanical advantage is greater than velocity ratio.
Output of machine is always less than input
A lever which always has mechanical advantage less than 1 has :
Load between effort and the fulcrum.
Effort between the load and the fulcrum.
Fulcrum between the load and effort.
Effort and load act at same point.
The correct relationship between the effort (E) load (L) and mechanical advantage (M.A.) is : (a) (b (c)(d)
M.A. = L × E
) M.A. × E = L
M.A. x L= E
none of these
The correct relationship between the velocity ratio (V.R) the distance through which effort act (d) and the distance through which load moves (D)
V.R. × D = d
V.R. = D × d
V.R. × d = D
none of these
The correct relationship between the efficiency (η), mechanical advantage (M.A.) and velocity ratio (V.R.) of an actual machine is : (a) (b) . (c) (d) both (b) and (c)
η = M.A × V.R
η = M.A. ÷ V.R
η × V.R. = M.A.
η × V.R. = M.A.
A fire tong is a lever of
First order
Second order
Third order
none of these
. A person standing vertically upon his toes is an example of lever of
First order
Second order
Third order
none of these
A lever which always have mechanical advantage more than 1 is
Lever of first order
Lever of second order
Lever of third order
none of these
. A lever which can have mechanical advantage either less than one or more than one depending upon the position of fulcrum is a lever of :
First order
Second order
Third order
none of these
. A single fixed pulley is used because : (a)
its efficiency is 100%
it multiplies effort
it multiplies speed
it changes the direction of applied effort
The actual mechanical advantage of a single movable pulley is
one
two
less than 2, but more than 1
none of these
A sheaf pulley system has
efficiency more than 100%
multiplies speed
multiplies effort
both (a) and (b)
A pulley system has 5 pulley in all. Its velocity ratio is
5
less than 5
more than 5
none of these
A single movable pulley has
velocity ratio 2, and actual mechanical advantage 2
velocity ratio 2, and actual mechanical advantage less than 2
velocity ratio 2, and actual mechanical advantage more than 2
none of the above
An actual pulley system always has mechanical advantage less than velocity ratio. It is because
a part of effort is wasted in overcoming friction.
a part of effort is wasted in overcoming load of movable block
both (a) and (b)
none of these b
. A hill road rises up by 0.50 m, when the horizontal distance covered along the inclined plane is 20 m. The gradient of hill road is
40 : 1
1 : 40
1 : 4
4 : 1
. Which is not an example of an inclined plane ?
A ramp
A crowbar
A hill road
A stair case
The mechanical advantage of an inclined plane
increases with the increase in angle of inclination
decrease with the increase in the angle of inclination
is unaffected with the increase in the angle of inclination
none of the above
The mechanical advantage of an inclined plane is always
less than 1
more than 1
equal to 1
none of these
A gear system is used for
gain in speed
gain in torque
change in the direction of rotation
all the above
The driving wheel and the driven wheel of a gear system has same number of teeth. The gear system
increases the speed
increases th e torque
changes the direction of rotation
both (b) and (c)
Velocity ratio (gear ratio) of a car gaining speed is
more than 1
less than 1
equal to one
none of these
In operating a water pump, a resistance of 480 N is overcome by an effort of 72 N. If the distance of the fulcrum from the point where the resistance act is 0.2 m. Find the distance from the fulcrum where effort is applied.
1.33 m
0.33 m
0.23 m
A uniform plank of a see-saw is 5m long and supported at its centre. A boy weighing 40 kgf sits at a distance 1.5 m from one end of the see-saw where must a girl weighing 25 kgf sit on the other end of the see-saw so as to balance the boy ?
1.9 m
0.9 m
2.9 m
0.09 m
