Work Energy and Machines
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Numerical Problems
SubtopicNumerical Problems under Work Energy and Machines for Grade 8 CBSE.
Preview questions (no answers)
- 1.
What is the energy possessed by a stone of mass kept on a hill high? (Take )
A.B.C.D. - 2.
Work done on an object does not depend on which of the following?
A.Force applied
B.Displacement
C.Initial velocity of the object
D.Angle between force and displacement
- 3.
A machine has a mechanical advantage of and velocity ratio of . What is its efficiency?
A.B.C.D. - 4.
An object of has of kinetic energy. What is its speed?
A.B.C.D. - 5.
A person of mass climbs a height of . Calculate the work done against gravity. (Take )
A.B.C.D. - 6.
A machine with an efficiency of has a velocity ratio of . What is its mechanical advantage?
A.B.C.D. - 7.
Find the kinetic energy of a truck of mass moving at a speed of .
A.B.C.D. - 8.
A hammer of mass strikes a nail with a velocity of and drives it into a wooden block. The average force exerted by the hammer on the nail is:
A.B.C.D. - 9.
A class 3 lever has an effort arm of and a load arm of . What is its mechanical advantage?
A.B.C.D. - 10.
A 100W bulb is switched on for 10 hours every day. How many 'units' (kWh) of electrical energy are consumed in 30 days?
A.B.C.D.
Download the worksheet for Work Energy and Machines - Numerical Problems to practice offline. It includes additional chapter-level practice questions.