54698.An external force is being applied on an object at some angle and it causes the object either to be pulled or pushed on a rough surface. Which of the following holds true ?
It is easier to push the object
It is easier to pull the object
It requires same efforts to push or pull the object
None of the above
54699.The commercial unit of energy consumption in households, industries and commercial establishments is
Joule
Watt
kW
KW h (kilowatt hour)
54700.A dog weighing 25 kg, while chasing a cat, jumps over a fence of height 1.6 m. What is the potential energy of dog at the top of fence ? (Take gravity due to earth g =10 m s-2 )
160 Joules
320 Joules
380 Joules
480 Joules
54701.A soldier makes a swing jump between two points, by holding one end of a rope, other end of which is tied to some higher point. Work done by rope in jumping of soldier from one point to another
is an example of :
is an example of :
Negative work
Positive work
Zero work done
None of the above
54702.A car with mass ‘M’ is moving on horizontal road with velocity ‘v’. Driver applies accelerator and increases it speed 3 times to ‘3v’. The final K.E. acquired by the car will be :
1.5 Mv2
2.5 Mv2
3.5 Mv2
4.5 Mv2
54703.Which of the following does not have unit as Joule?
Work done
Kinetic energy
Potential energy
Force
54704.A runner, while moving, is facing a wind from the opposite direction. The work done by the wind on runner will be
Zero
negative
Positive
infinity
54705.As per the statement given in Q.9 above, What change it will take place for the potential energy of the car
It will remain the same
It will increase
It will decrease
It will becomes 3 times the Intial P.E.
54706.In winters, rubbing of hands together for some time, causes a sensation of warmth mainly because of
heat caused by the force of friction
heat caused by the momentum
heat caused by the motion
heat flows from the blood to skin
54707.A cyclist is moving at a speed of 5 m/s on leveled road. While going down the slop, his speed increases to 7 m/s. Here the nature of work done by gravitational force in increasing the speed of
cyclist is an example of?
cyclist is an example of?
positive work done
negative work done
Infinite work done
Zero work done
54710.The list which contains only elements is
air, water, oxygen
hydrogen, oxygen, brass
air, water, fire, earth
calcium, sulphur, carbon
54711.A reactant containing the element that is oxidised is called
reducing agent
oxidising agent
hydrogen
sublime
54713.By losing one or two electrons the atoms of metal are
oxidised
reduced
hydrogenated
sublimated
54714.A reactant containing the element that is oxidized is called
reducing agent
oxidising agent
hydrogen
sublime