Free download in PDF Power and Energy Short Questions & Answers for competitive exams. These objective type questions are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
41
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 ?
A
It is easier to push the object
B
It is easier to pull the object
C
It requires same efforts to push or pull the object
42
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 :
44
In first case, a force of 5 N is applied on a object for 6 minutes and displaces it by 10 meters. In second case, A force of 10 N is applied on the same object for 3 minutes and displaces it by 5 meters. In which case there is more work done?
51
As a person climbs up from ground floor of the building to higher floor, The potential energy of person on the higher floor, relative to the ground floor, can be expressed as
A
the work done in lifting his weight from ground floor to higher floor
B
the product of his weight and the distance between the ground and higher floor
C
the energy the person because of his position above the ground floor
52
According to standard definition of Work done, when the force 'F' acts on the object and object is displaced through a distance 's' in the direction of the force, then work done by a force is equal to
55
For an object of mass 'm', falling freely from height 'h', under acceleration due to gravity 'g', If v is the velocity of the object at a given instant, then during the course of its fall, for all points, which of the expression given below is correct ?
56
A vector quantity has both magnitude as well as direction, where as a scalar quantity has only magnitude and no direction. which of the given below is a scalar quantity?
57
In a construction site, a crane lifts 1000 kg of concrete mix to roof top at a height of 20 meters in 50 seconds. If the value of gravity 'g' due to earth is 10 m s-2, the power of elevator will be..
58
An object is thrown vertically upward and it reaches to a maximum height 'h' from the ground. During its flight, on reaching 3/4 of height H, it will acquire?
