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Questions For work and energy class 9 mcq
The unit of power is........
(A) Newton
(B) Joule
(C) Watt
(D) None of these
We define work to be equal to the product of the.......
(A) force and velocity
(B) force and displacement
(C) foce and acceleration
(D) None of these
Work has only magnitude and no direction so it is a...
(A) scalar quantity
(B) vector quantity
(C) scatter quantity
(D) None of these
The unit of work is
(A) Newton metre (Nm)
(B) Joule (J).
(C) both a and b
(D) None of these
1 J is the amount of work done on an object when a force of 1 N displaces it by 1 m along the line of action of the force.
(A) True
(B) False
(C) Can't Say
(D) Partially True
What would be the work done when the displacement of the object is zero?
(A) infinity
(B) 100 Joule
(C) Zero
(D) None of these
The ................ is the biggest natural source of energy to us.
(A) Stars
(B) Sun
(C) Moon
(D) None of these
The object which does the work loses energy and the object on which the work is done gains energy
(A) True
(B) False
(C) Can't Say
(D) Partially True
The unit of energy is, therefore, the same as that of ........
(A) work
(B) power
(C) momentum
(D) None of these
1 kJ equals..............
(A) 10 J
(B) 100 J
(C) 1000 J
(D) None of these
Who verified experimentally the law of conservation of energy and discovered the value of the mechanical equivalent of heat?
(A) Newton
(B) Watt
(C) Joule
(D) None of these
12. Objects in motion possess energy. We call this energy as.........
(A) Kinetic Energy
(B) Potential Energy
(C) Mechanical Energy
(D) None of these
13. A falling coconut, a speeding dar, a rolling stone, a flying aircraft, flowing water, blowing wind, a running athlete etc. possess......
(A) Kinetic Energy
(B) Potential Energy
(C) Mechanical Energy
(D) None of these
14. An object of mass 15 kg is moving with a uniform velocity of 4 ms. What is the kinetic energy possessed by the object?
(A) 12 J
(B) 120 J
(C) 303 J
(D) None of these
Conditions need to be satisfied for work to be done are.....
(A) a force should act on an object
(B) the angle between force and displacement is 90 degree
(C) the object must be displaced
(D) Both (A) and (B)
15. The energy transferred to an object is stored as ............. energy if it is not used to cause a change in the velocity or speed of the object.
(A) Heat
(B) Kinetic
(C) Potential
(D) None of these
16. You transfer energy when you stretch a rubber band. The energy transferred to the band is its.
(A) Kinetic Energy
(B) Potential Energy
(C) Mechanical Energy
(D) Electrical Energy
17. The gravitational potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity.
(A) True
(B) False
(C) Can't Say
(D) Partially True
18. Which energy of an object at a height depends on the ground level or the zero level you choose?
(A) Kinetic Energy
(B) Potential Energy
(C) Mechanical Energy
(D) None of these
19. The sum of kinetic energy and potential energy of an object is its total.....
(A) Heat Energy
(B) Potential Energy
(C) Mechanical Energy
(D) None of these
20. We find that during the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in ........
(A) Heat Energy
(B) Kinetic Energy
(C) Mechanical Energy
(D) None of these
1 watt is the power of an agent, which does work at the rate of 1 Calorie per second
(A) True
(B) False
(C) Can't Say
(D) Partially True
1 Horsepower is equal to how many watt.....
(A) 716
(B) 736
(C) 746
(D) None of these
When a body falls freely towards the earth, then its total energy
(A) increases
(B) decreases
(C) remains constant
(D) first increases and then decreases
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(A) does not change
(B) becomes twice to that of initial
(C) becomes 4 times that of initial
(D) becomes 16 times that of initial
In case of negative work the angle between the force and displacement is
(A) 0°
(B) 45°
(C) 90°
(D) 180°
Two objects of masses 1 x 10®kg and 4 x 10 kg have equal momentum. What the ratio of their kinetic energies?
(A) 2:1
(B) 4:1
(C) 1:4
(D) 1:2
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same......
(A) acceleration
(B) momenta
(C) potential energy
(D) kinetic energy
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms?)
(A) 6x10^3 J
(B) 6J
(C) 0.6 J
(D) zero
Which one of the following is not the unit of energy?
(A) joule
(B) newton metre
(C) kilowatt
(D) kilowatt hour
The work done on an object does not depend upon the
(A) displacement
(B) force applied
(C) angle between force and displacement
(D) initial velocity of the object
1 kWh = 3.6 x 10 J.
(A) True
(B) False
(C) Can't Say
(D) Partially True
Water stored in a dam possesses
(A) no energy
(B) electrical energy
(C) kinetic energy
(D) potential energy
A body is falling from a height h. After it has fallen a height 2m, it will possess
(A) only potential energy
(B) only kinetic energy
(C) half potential and half kinetic energy
(D) more kinetic and less potential energy
When a body falls freely towards the earth, then its total energy
(A) Decreases
(B) Increases
(C) First increases and then decreases
(D) Remains constant
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car
(A) Becomes twice to that of the initial
(B) Becomes four times to that of the initial
(C) Remains the same
(D) Becomes 16 times to that of the initial
The form of energy possessed by a flying bird is:
(A) Kinetic energy
(B) Potential energy
(C) Both kinetic and potential energy
(D) Can't say
The work done on an object does not depend upon the:
(A) Angle between force and displacement
(B) Force applied
(C) Initial velocity of the object
(D) Displacement
Work done by friction
(A) increases kinetic energy of body
(B) decreases kinetic energy of body
(C) increases potential energy of body
(D) decreases potential energy of body
A microphone converts:
(A) Sound energy into mechanical energy
(B) Sound energy into electrical energy
(C) Electrical energy into sound energy
(D) Microwave energy into sound energy
Potential energy of a body depends on its
(A) position
(B) configuration
(C) position and configuration
(D) mass and velocity
One joule work is said to be done when
(A) a force of 1 N displaces a body by 1 cm.
(B) a force of 1 N displaces a body by 1 m.
(C) a force of 1 dyne displaces a body by 1 m.
(D) a force of 1 dyne displaces a body by 1 cm.
Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B?
(A) 1:2
(B) 1:4
(C) 2:1
(D) 14.1
If speed of a car becomes 2 times, its kinetic energy becomes
(A) 4 times
(B) 8 times
(C) 16 times
(D) 12 times
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