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question_answer1)
In order to do work, energy is
A)
transferred or converted done
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B)
used up done
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C)
lost done
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D)
lost or transferred done
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question_answer2)
Potential energy and kinetic energy are types of
A)
Electrical energy done
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B)
Magnetic energy done
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C)
Thermal energy done
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D)
Mechanical energy done
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question_answer3)
Pendulum bob stops moving when all its original gain in gravitational potential energy has been converted to
A)
Sound Energy done
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B)
Thermal Energy done
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C)
Light Energy done
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D)
Kinetic Energy done
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question_answer4)
Formula for gravitational potential energy is
A)
\[{{E}_{P}}=mg/h\], where m is mass, g is gravitational pull and is height done
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B)
\[{{E}_{P}}=m/gh\], where m is mass, g is gravitational pull and is height done
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C)
\[{{E}_{P}}=mgh\], where m is mass, g is gravitational pull and is height done
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D)
\[{{E}_{P}}=gh/m\], where m is mass, g is gravitational pull and is height done
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question_answer5)
Power is defined as
A)
p = W/'t, where W is work and t is time done
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B)
p = t/W, where t is time and W is work done
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C)
p = W/'d, where W is work and d is distance done
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D)
p = d/W, where d is distance and W is work done
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question_answer6)
Formula for efficiency is
A)
(energy input / energy output)\[\times \]100 done
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B)
(energy input / energy output)\[\times \]100 done
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C)
(useful energy input / energy output)\[\times \]100 done
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D)
(useful energy output / total energy input)\[\times \]100 done
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question_answer7)
Food we eat contains
A)
Chemical Potential Energy done
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B)
Elastic Potential Energy done
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C)
Gravitational Potential Energy done
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D)
Kinetic energy done
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question_answer8)
A constant force on an object given by product of force and distance moved by object in direction of force is termed as
A)
Work done done
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B)
Efficiency done
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C)
Power done
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D)
Energy done
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question_answer9)
Pendulum bob cannot attain its initial height because
A)
it continues to lose energy in thermal form done
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B)
it continues to lose energy in sound form done
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C)
it continues to lose energy in light form done
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D)
it continues to lose energy in potential form done
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question_answer10)
Wind and waves are used by turbines to convert
A)
Mechanical Energy into Electrical Energy done
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B)
Kinetic Energy into Electrical Energy done
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C)
Potential energy into Kinetic Energy done
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D)
Potential Energy into Electrical Energy done
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question_answer11)
Knocking a nail into a wooden block with a hammer involves conversion between different forms of energy, which of following choices present this conversion in correct order.
A)
chemical energy\[\to \]gravitational potential energy\[\to \]kinetic energy\[\to \](sound energy + heat energy) done
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B)
chemical energy\[\to \]kinetic energy\[\to \]gravitational potential energy\[\to \](sound energy + heat energy) done
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C)
chemical energy\[\to \](sound energy + heat energy)\[\to \]kinetic energy\[\to \]gravitational potential energy done
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D)
(sound energy + heat energy)\[\to \]chemical energy\[\to \]kinetic energy\[\to \]gravitational potential energy done
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question_answer12)
An object of mass 'm' raised to a height '2h' above ground level possesses a gravitational potential energy of
A)
\[1/2\times mgh\] done
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B)
mgh done
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C)
2 mgh done
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D)
\[m\times g/2h\] done
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question_answer13)
A light and heavy body have equal momentam. Which one has greater kinetic energy?
A)
The light body done
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B)
The heavy body done
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C)
Both have same KE done
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D)
None of these done
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question_answer14)
A car stopped screeching to avoid crash with a van, change is involved in process is
A)
Kinetic energy is converted into sound energy done
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B)
Kinetic Energy is converted into sound and thermal energy done
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C)
Potential energy is converted into sound, heat and kinetic energy done
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D)
Kinetic and potential energy is converted into thermal and sound energy done
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question_answer15)
A compressed spring possesses
A)
Kinetic Energy done
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B)
Elastic Potential Energy done
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C)
Gravitational Potential Energy done
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D)
Sound Energy done
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question_answer16)
If a bulb uses energy of 100 J and remains on for 25 s, power consumed by bulb will be
A)
125 W done
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B)
4 W done
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C)
2500 W done
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D)
75 W done
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question_answer17)
For two objects A and B, if mass of A is same as mass of B and speed of A is twice as much as that of B, statement that is correct is
A)
Kinetic energy of A= kinetic energy of B; because, kinetic energy is independent of speed of object. done
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B)
Since kinetic energy is inversely proportional to speed of object, kinetic energy of A<kinetic energy of B done
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C)
Kinetic energy of A = 1 D 4 \[\times \] Kinetic energy of B done
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D)
Kinetic energy of \[A=4\times \]Kinetic energy of B done
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question_answer18)
When spring or rubber band is released it converts potential energy into
A)
Mechanical Energy done
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B)
Electrical Energy done
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C)
Thermal energy done
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D)
Kinetic energy done
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question_answer19)
When an object is raised to a certain height above ground, it possesses
A)
Chemical Potential Energy done
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B)
Elastic Potential Energy done
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C)
Gravitational Potential Energy done
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D)
Kinetic energy done
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question_answer20)
The work done on an object does not depend upon the
A)
Displacement done
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B)
Force applied done
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C)
Angle between force and displacement done
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D)
Initial velocity of the object done
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question_answer21)
If the speed of an object is doubled then its kinetic energy is ___
A)
doubled done
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B)
quadrupled done
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C)
halved done
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D)
tripled done
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question_answer22)
The type of energy possessed by a simple pendulum, when it is at the mean position is
A)
kinetic energy done
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B)
potential energy done
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C)
potential energy + kinetic energy done
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D)
sound energy done
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question_answer23)
Power Is a measure of the ____
A)
rate of change of momentum done
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B)
force which produces motion done
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C)
change of energy done
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D)
rate of change of energy done
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question_answer24)
If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body____
A)
increases done
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B)
decreases done
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C)
becomes zero done
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D)
remains the same done
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question_answer25)
In case of negative work, the angle between the force & displacement is:
A)
\[0{}^\circ \] done
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B)
\[45{}^\circ \] done
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C)
\[90{}^\circ \] done
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D)
\[180{}^\circ \] done
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question_answer26)
The work done on an object does not depend on the:
A)
Displacement done
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B)
Angle between force and displacement done
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C)
Force applied done
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D)
Initial velocity of the object done
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question_answer27)
Water stored in a dam possesses:
A)
No energy done
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B)
Electrical energy done
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C)
Kinetic energy done
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D)
Potential energy done
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question_answer28)
A 1 kg block is lifted veritically 1 m by a boy. The work done by the boy is
A)
1J done
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B)
0J done
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C)
9.8 J done
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D)
0.IJ done
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question_answer29)
During inter-con version of energy from one form to other forms, total energy at any time remains
A)
constant done
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B)
zero done
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C)
increasing done
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D)
decreasing done
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question_answer30)
When we raised up a hammer, energy possessed is called
A)
kinetic energy done
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B)
chemical energy done
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C)
nuclear energy done
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D)
potential energy done
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question_answer31)
Sunlight and water power are sources of energy which are
A)
renewable done
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B)
very harmful done
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C)
fossils done
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D)
destroyable done
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question_answer32)
A nuclear power plant uses energy released in nuclear reactor to generate electric power is called
A)
fission done
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B)
friction done
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C)
hydrogen done
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D)
mercury done
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question_answer33)
By burning large amount of fuel, we get
A)
petrol done
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B)
heat done
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C)
sound done
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D)
chemicals done
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question_answer34)
If a body works at rate of 1 joule per second, then power of that body will be
A)
one watt done
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B)
zero watt done
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C)
half watt done
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D)
two watts done
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question_answer35)
Solar energy can also be converted directly into electricity by
A)
solar cars done
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B)
mercury done
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C)
plasma done
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D)
solar cells done
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question_answer36)
An electric lamp produces
A)
light energy done
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B)
heat energy done
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C)
both A and B done
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D)
electrical energy done
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question_answer37)
If direction of motion of force is perpendicular to direction of motion of body, and then work done will be
A)
minimum done
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B)
zero done
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C)
maximum done
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D)
none of above done
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question_answer38)
A nuclear reactor generates electricity by using
A)
thermal energy done
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B)
nuclear energy done
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C)
mechanical energy done
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D)
chemical energy done
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question_answer39)
A system which gives an output equal to total energy used by it is called
A)
negative system done
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B)
non-ideal system done
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C)
ideal system done
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D)
slow system done
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question_answer40)
Kinetic energy with mass 'm' and velocity 'v' is
A)
\[2\,\,m{{v}^{2}}\] done
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B)
\[1/2\,\,mv\] done
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C)
\[2mD{{v}^{2}}\] done
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D)
\[1/2\,\,m{{v}^{2}}\] done
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question_answer41)
Ratio of required form of energy obtained from a system as output to total energy given to it as input is called it's
A)
efficiency done
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B)
power done
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C)
stress done
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D)
strain done
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question_answer42)
When a body vibrates, it produces
A)
sound done
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B)
water done
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C)
heat done
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D)
electricity done
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question_answer43)
Capacity of a body to do work is called
A)
energy done
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B)
workload done
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C)
kinetic energy done
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D)
potential energy done
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question_answer44)
If some energy given to a system, then energy in required form obtained is always
A)
less than the given energy done
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B)
equal to the given energy done
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C)
greater than the given energy done
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D)
none of above done
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question_answer45)
In process of rubbing hands, mechanical energy is converted into
A)
sound energy done
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B)
electrical energy done
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C)
thermal energy done
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D)
heat energy done
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question_answer46)
Work done will be zero if the angle between force and distance is
A)
\[30{}^\circ \] done
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B)
\[90{}^\circ \] done
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C)
\[180{}^\circ \] done
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D)
\[60{}^\circ \] done
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question_answer47)
Electric generators convert mechanical energy into
A)
light energy done
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B)
sound energy done
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C)
electrical energy done
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D)
chemical energy done
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question_answer48)
If a box is pulled by a rope making an angle with surface then horizontal component of force is equal to
A)
F sine done
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B)
F cose done
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C)
F tane done
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D)
None of above done
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question_answer49)
Energy can be converted into some other forms but cannot be
A)
destroyed done
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B)
decrease done
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C)
increase done
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D)
none of above done
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question_answer50)
Energy that causes water to evaporate from surface to form water vapors is known as
A)
electrical energy done
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B)
thermal energy done
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C)
chemical energy done
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D)
heat energy done
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