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CBSE Questions for Class 9 Physics Work And Energy Quiz 6 - MCQExams.com

An overhead tank having some water possesses .......... energy.
  • Kinetic
  • Potential
  • Thermal
  • Electrical
Potential energy is directly proportional to:
  • velocity of the body
  • speed of the body
  • height of the body from the surface
  • shape of the body
Which of the following does has kinetic energy ?
  • An inflated balloon
  • Water in a flowing river
  • A fruit on the tree
  • A stationary plane
Which of the following possesses kinetic energy?
  • A fallen tree
  • Running athlete
  • Wound watch spring
  • Boy standing on the road
A box of mass 1 kg is pulled on a horizontal plane of length 1 m  by a force of 8 N  then it is raised vertically to a height of 2 m, the net work done is:
  • 28 J
  • 8 J
  • 18 J
  • none of the above
Energy is the capacity to do work.
  • True
  • False
A rigid body of mass m kg is lifted uniformly by a man to a height of one metre in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done on the body against gravitation in both the cases are in ratio:
  • 1 : 2
  • 1 : 1
  • 2 : 1
  • 4 : 1
The law of conservation of energy implies that the:
  • Total mechanical energy is conserved
  • Total kinetic energy is conserved
  • Total potential energy is conserved
  • Sum of all kinds of energies is conserved
In which one of the following cases is work done the maximum ?
  • Mohan pushes against a wall for 30 minutes
  • Mohan pushes a bicycle which moves through a distance of 1.5 m
  • Mohan pushes a truck which does not move at all
  • Mohan stands in the centre of his room
What is work done in holding a body of mass 20 kg at a height of 2 m above the ground? (g=10 m/s2)
  • 40 J
  • 400 J
  • 10 J
  • Zero
Which one of the following possesses kinetic energy?
  • A moving car
  • A compressed spring
  • Water stored in the reservoir of a dam
  • A car parked in the garage
Work done by static friction force when a person starts running is .......... .
  • equal to the weight of the person
  • zero
  • infinite
  • cannot be calculated
A vehicle travelling at 30 m/s stops at a distance of 50 m decelerating uniformly. A force of 9000 N is exerted on it by the brakes. What is the work done by the brakes?
  • 4.5×104 J 
  • 2.7×105 J 
  •  4.5×105 J 
  • 2.7×104 J 
How fast should a girl of 40 kg run so that her kinetic energy is 320J?
  • 64 m/s
  • 8 m/s
  • 16 m/s
  • 4 m/s
Energy conservation law says that:
  • Energy can't be destroyed but can be produced.
  • Neither energy can be produced nor can be destroyed.
  • Energy can't be produced but can be destroyed.
  • Energy can be produced and can be destoyed
A body at rest have:
  • Energy
  • Momentum
  • Speed
  • Velocity
The velocity of a bus, moving on a smooth road, is increased from 8 m/s to 32 m/s in 120s. During this process, the potential energy of the bus
  • Does not change
  • Becomes twice that of initial potential energy
  • Becomes four times that of initial potential energy
  • Becomes sixteen times that of initial potential energy
Two bodies P and Q of equal masses are kept at heights x and 4x respectively. What will be the ratio of their potential energies?
  • 1:8
  • 4:1
  • 1:4
  • 8:1
An object of mass 500 g falls from a height of 2m. If g=9.8m/s2, what is its kinetic energy just before touching the ground?
  • Zero
  • 19.6 J
  • 9.8 J
  • 9800 J
A stone is projected vertically up to reach maximum height h. The ratio of its kinetic to potential energies at a height 4h5 will be
  • 5:4
  • 4:5
  • 1:4
  • 4:1
What is the mass of a man if he does 3600 J of work in climbing a tree 6 m tall? (g=10m/s2)
  • 70 kg
  • 60 kg
  • 85 kg
  • 52 kg
When a stone falls freely towards the earth, its total energy ?
  • First decreases and then becomes zero
  • Remains constant
  • Increases
  • Decreases
A car is being driven at a constant speed of 5 m/s  by a force of 3×108 N. It takes 2 minutes to reach its destination. What is the work done?
  • 15×108 J
  • 18×1010 J
  • 6×1010 J
  • 10×108 J
The velocity of a ball goes on decreasing when it is thrown vertically upwards. When its velocity becomes zero, its potential energy becomes
  • Minimum
  • Maximum
  • Zero
  • 9.8 J
A car is moving at 100 km/h. If the mass of the car is 950 kg, Its kinetic energy is:
  • 367 MJ
  • 0.367 MJ
  • 3.67 MJ
  • 3.67 J
A girl weighing 50 kg makes a high jump of 1.2 m.What is her kinetic energy at the highest point? (g=10ms2)
  • 6000 J
  • 600 J
  • 60 J
  • Zero
Which one of the following possesses both kinetic and potential energies?
  • A man walking on the road
  • A man climbing a hill
  • A man lying on his bed
  • A man running in the garden.
A body is under the action of two equal and opposite forces, each of 10 N. The body is displaced by 5 m.The work done is
  • +50J
  • -50J
  • 100J
  • Zero
The spring of the winding knob of a watch has
  • mechanical energy
  • only kinetic energy
  • only potential energy
  • kinetic or potential energy
The energy possessed by wind is
  • kinetic energy
  • potential energy
  • thermal energy
  • sound energy
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