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CBSE Questions for Class 9 Physics Work And Energy Quiz 7 - MCQExams.com

The unit for the measurement of power is:
  • Watt
  • Kilowatt
  • Kilowatthour
  • Horsepower
You lift a suitcase from the floor and keep it on the table. The work done by you on the suitcase depends on
  • the path taken by the suitcase
  • your weight
  • the weight of the suitcase
  • the time taken by you in doing so
A body at rest may have
  • speed
  • velocity
  • energy
  • momentum
The work done in lifting 1 kg mass to a height of 9.8 m is about
  • 1 J
  • 9.8 J
  • (9.8)2J
  • 1(9.8)2J
Work done by centripetal force in revolving a satellite around the earth is
  • Zero
  • Unity
  • Infinity
  • Nothing can be decided
If a body moves along a frictionless horizontal surface its weight:
  • Does work
  • Does not work
  • Work partially
  • None of these
kgm2s2 represents the unit of :
  • kinetic energy only
  • work done only
  • potential energy only
  • all the above
A wound watch spring has ______ energy.
  • Mechanical
  • Kinetic
  • Potential
  • Kinetic and potential
Asha lifts a doll from the floor and places it on a table. If the weight of the doll is known, what else does one need to know in order to calculate the work Asha has done on the doll?
  • the time required
  • the height of the table
  • the power she could deliver
  • cost of the doll or the table
If the speed of a motor car becomes six times, then the kinetic energy becomes
  • 6 times
  • 36 times
  • 12 times
  • 24 times
The flowing water of a river primarily possesses ______ energy.
  • gravitational
  • potential
  • electrical
  • kinetic
When a body moves with a constant speed along a circle, then which of the following is correct : 
  • no force acts on it
  • its velocity remains constant
  • no work is done on it
  • no acceleration is produced in it
Two bodies of equal weight are kept at heights of h and 1.5 h respectively. The ratio of their P.E. will be :
  • 3: 2
  • 2: 3
  • 1: 1
  • none of these
A body rolling down a hill has :
  • K.E. only
  • P.E. only
  • neither K.E. nor P.E.
  • both K.E. and P.E
The kinetic energy of a body is increased by increasing its:
  • Mass
  • Weight
  • Velocity
  • Potential energy
Kilowatt hour (kWh) represents the unit of :
  • power
  • impulse
  • momentum
  • energy
The unit of power is:
  • watt per second
  • joule
  • kilo joule
  • watt
A ball of mass 200g falls from a height of 5m. What is its K.E. when it just reaches the ground ?
  • 9.8J
  • 98J
  • 980J
  • None of these
The number of joules contained in 1kWh is
  • 36×102
  • 36×103
  • 36×104
  • 3.6×106
An object of mass 1kg has a P.E. of 1J relative to the ground when it is at a height of
  • 0.1m
  • 1m
  • 9.8m
  • 32m
A raised hammer possesses :
  • K.E. 
  • P.E.
  • electrical energy
  • sound energy
A body at rest can have:
  • speed
  • energy
  • momentum
  • velocity
Work done upon a body is
  • a vector quantity
  • a scalar quantity
  • always positive
  • always negative
The mass of an object P is double the mass of Q. If both move with the same velocity, then the ratio of K.E. of P to Q is
  • 1 : 2
  • 2 : 1
  • 1 : 4
  • 4 : 1
Mechanical work done is equal to (symbol have their usual meanings)
  • W=FS
  • W=FS
  • W=F+S
  • W=FS
A person walks 100 m, holding a suitcase of weight 100 N. The work done by the applied force is ____ J. 
  • 10000
  • 100
  • zero
  • 5000
The product of force and displacement equals:
  • work
  • power
  • momentum
  • none of these
(i) What is the work done by the porter when he climbs up a height of 10 m (g=10 ms2)
  • 5kJ2
  • 50kJ
  • 100kJ2
  • 5kJ
A force of 5 N causes a displacement of 10 m in its direction. Calculate the work done by the force.
  • 15 J
  • 25 J
  • 50 J
  • 200 J
What is the work done by a force of 2 N in displacing a body by 2 m in the direction of the force?
  • 4J2 
  • 6J 
  • 4J 
  • 48J 
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