CBSE Class 9 workenergy — practice questions
39 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 9 workenergy in the app →The SI unit of work is the:For work to be done on an object by a force, which condition must be met?When a goalkeeper stops a football, the force she applies on the ball does:A girl applies a force of 50 N to push a box and the box moves 4 m in the direction of the force. How much worA man pushes a wall with a force of 200 N. The wall does not move. How much work has the man done?The work-energy theorem states that the work done on an object by all forces equals:Calculate the kinetic energy of a 2 kg object moving at 10 m/s.A 5 kg bag is lifted slowly from the ground to a height of 2 m. Taking g = 10 m/s², the work done against gravIf the velocity of an object doubles, its kinetic energy:A child slides down a smooth slide from rest, starting at a height of 5 m. Ignoring friction and taking g = 10Which slide will give a child the HIGHEST velocity at the bottom — a steep slide of height 5 m, or a gently inIn physics, WORK is said to be done on an object ONLY when:A man holds a heavy suitcase stationary in his hand for 5 minutes. The WORK done by him on the suitcase is:A 2 kg cricket ball moving at 30 m/s has a kinetic energy of:A 5 kg bag lifted to a height of 3 m above the ground (g = 10 m/s²) has gravitational POTENTIAL ENERGY of:The WORK-ENERGY THEOREM states that:The LAW OF CONSERVATION OF ENERGY states that:The SI unit of POWER is the:The COMMERCIAL UNIT of electrical energy, used on electricity bills, is the:The SI unit of work is the:The SI unit of energy is the:Energy possessed by a moving object is called:Energy stored because of position is called:If the force on an object is zero, the work done is:Power is the rate of doing:The SI unit of power is the:One watt equals one joule per:Work done by a force perpendicular to the motion is:When positive work is done on an object, it:If negative work is done, the kinetic energy:An object at rest has kinetic energy equal to:If the speed of a vehicle doubles, its kinetic energy becomes:Mechanical advantage is the ratio of load to:The mechanical advantage of a fixed pulley is:A fixed pulley mainly changes the effort's:A longer, shallower inclined plane gives a mechanical advantage that is:The fixed point about which a lever rotates is the:In a lever, the end that applies the larger force moves:Runaway truck ramps on highways work as: