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WorksheetsDAY 50 WORKSHEET LSGD (EM 2 )
Total questions: 15
Worksheet time: 11mins
Which of the following is a derived unit in SI?
Candela
Kelvin
Pascal
Mole
A system of forces with a non-zero resultant and a non-zero moment is known as —
Concurrent
Coplanar
Non-concurrent & non-parallel
General force system
A body acted upon by three non-parallel forces is in equilibrium only if the forces —
Are equal in magnitude
Form a couple
Are concurrent
Act at 90°
If an object moves in a circular path at constant speed, its velocity —
Remains constant
Is zero
Changes in direction only
Changes in magnitude only
The property that enables a material to regain its original shape after deformation is —
Plasticity
Elasticity
Creep
Fatigue
TRUE/FALSE
Limiting friction always acts before the body starts moving (a)
TRUE/FALSE
Mechanical advantage of an ideal machine is always less than its velocity ratio (a)
Assertion (A): Even when two bodies slide at constant speed, kinetic friction continues to oppose motion. Reason (R): Kinetic friction depends on the value of acceleration of the body.
A and R true; R explains A
A and R true; R does not explain A
A true; R false
Both false
The moment of a force is equal to force × (a) .
The rate of doing work is known as (a) .
In a velocity–time graph, the area under the curve represents (a) .
The frictional force that acts between two surfaces without relative motion is (a) friction.
The property of a material to resist fracture when stressed slowly is (a) .
Match the following:
Coplanar forces
Forces act in same plane
Concurrent forces
Lines of action intersect
Couple
Equal & opposite parallel forces
Resultant zero
Moment is zero
MATCH THE FOLLOWING
Work
Force × distance
Power
Energy per second
Ideal machine
VR = MA
Efficiency
MA / VR
