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WorksheetsCLASS IX CDF MOCK TEST
Total questions: 20
Worksheet time: 10mins
commercial unit of power is ______________
kwh
watt
horse power
all the above
in S.I. system , unit of power is_____________
kwh
watt
horse power
none
if F and V are along the same direction, then P=
FV
F/V
P/V
PV
if F and V are along the same direction, then P=FV , F=
FP
F/V
P/V
PV
workdone by all the forces acting on a particle or an object is equal to the_____________of it
change in kinetic energy
change in potential energy
change in mechanical energy
all the above
________________ -work done by the resultant force is equal to the sum of work done by the individual force
pythogorus theorem
work energy theorem
work theorem
energy theorem
------------------ is applicable for not only a single particle but also for total system of particles
pythogorus theorem
work energytheorem
energytheorem
work theorem
energy can be neigther be created or nor be destroyed but it can be converted from one form to another form of energy without any loss or gain of energy.the total energy of the closed system remains constant.this law is known as________________
law of conservation of mass
law of conservation of energy
law of conservation of charge
all the above
in case of freely falling body and vertically projected body the sum of potential energy and kinetic energy at any point in its path is_____________
variable
0
constant
1
according to work energy theorem, work done by all forces, i.e conservative,non conservative,external force is equal to___________
change in kinetic energy
change in potential energy
change in mechanical energy
all the above
work done by all forces except conservative force is equal to___________
change in kinetic energy
change in potential energy
change in mechanical energy
all the above
the negative of the work done by the conservative internal forces is equal to _______________________of the system
change in kinetic energy
change in potential energy
change in mechanical energy
all the above
if the internal forces are conservative,the work done by the external forces is equal to _______________________
change in kinetic energy
change in potential energy
change in mechanical energy
all the above
mass energy equivalence, E=______
m + c2
mc2
m/c2
none
if m=1amu= 1.67 ×10-27 kg then E=____________
931.5 eV
931.5 MeV
93.15 MeV
9.315 MeV
if m=1amu= 1.67 ×10-27 kg then E=____________
1.5 × 10-10 J
1.5 × 10-15 J
1.5 × 10-1 J
1.5 × 10-20 J
if m= 1kg, then E=_______________
9×1017J
9×1018J
9×1016J
9×1019J
if the internal forces are________________,the work done by the external forces is equal to change in mechanical energy
conservative
non-conservative
both 1 & 2
none
the ______________of the work done by the conservative internal forces is equal to change in potential energyof the system
positive
negative
zero
all the above
work done by all forces except__________ is equal to change in mechanical energy
conservative force
non conservative
both 1 & 2
none
