CBSE Questions for Class 11 Medical Physics Work, Energy And Power Quiz 5 - MCQExams.com

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
Choose the correct option:
  • If only conservative forces act on a particle, the kinetic energy remains constant.
  • If the net force acting on an object is zero, then the object is at rest.
  • If net mechanical work is done on a body, the body must accelerate.
  • If net mechanical work is done on a body, the speed of body remains unchanged.
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
An object of mass 500 g falls from a height of 2m. If $${g = 9.8 m/s^2}$$, what is its kinetic energy just before touching the ground?
  • Zero
  • 19.6 J
  • 9.8 J
  • 9800 J
A truck and a car are moving on a smooth, level road such that the kinetic energy,momentum and speed associated with them is same. Brakes are applied simultaneously in both of them such that equal retarding forces are produced in them. Which one will cover a greater distance before it stops?
  • car
  • truck
  • both will cover the same distance
  • nothing can be decided
The spring of the winding knob of a watch has
  • mechanical energy
  • only kinetic energy
  • only potential energy
  • kinetic or potential energy
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
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
The work done in lifting 1 kg mass to a height of 9.8 m is about
  • 1 J
  • 9.8 J
  • $$(9.8)^2 J$$
  • $$\displaystyle \frac{1}{(9.8)^2} J$$
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? $${(g= 10 ms^{-2}}$$)
  • 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 wound watch spring has ______ energy.
  • Mechanical
  • Kinetic
  • Potential
  • Kinetic and potential
If the speed of a motor car becomes six times, then the kinetic energy becomes
  • 6 times
  • 36 times
  • 12 times
  • 24 times
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
A body at rest may have
  • speed
  • velocity
  • energy
  • momentum
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 at rest can have :
  • Speed
  • Energy
  • Momentum
  • Velocity
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
A raised hammer possesses :
  • K.E. 
  • P.E.
  • electrical energy
  • sound energy
The kinetic energy of a body is increased by increasing its:
  • Mass
  • Weight
  • Velocity
  • Potential energy
The moon revolves around the earth because the earth exerts a radial force on the moon. Does  the earth perform work on the moon?
  • no
  • yes, sometimes
  • yes, always
  • cannot be decided
A ball moving with a velocity v strikes a wall moving toward the ball with a velocity u. An elastic impact lasts for t sec. Then the mean elastic force acting on the ball is 
  • $$\displaystyle \frac { 2mv }{ t } $$
  • $$\displaystyle \frac { 2m\left( \upsilon +u \right) }{ t } $$
  • $$\displaystyle \frac { 2m\left( \upsilon +2u \right) }{ t } $$
  • $$\displaystyle \frac { m\left( 2\upsilon +u \right) }{ t } $$
Two bullets P and Q, masses 10 and 20 g, are moving in the same direction towards a target with velocities of 20 and 10 m/s respectively. Which one of the bullets will pierce a greater distance through the target?
  • P
  • Q
  • Both will cover the same distance
  • Nothing can be decided
A car is moving along a straight level road with constant speed. Then
  • The work done on the car is infinite
  • The work done on the car is zero
  • The work done on the car is a measure of the gravitational potential energy
  • The work done on the car cannot be found
A man throws the brick to the height of 12 m where they reach with a speed of 12 m/s. If he throws the bricks such that they just reach this height, then what percentage of energy will be save?
  • 19%
  • 38%
  • 57%
  • 76%
An object of mass $$1  kg$$ has a P.E. of $$1  J$$ relative to the ground when it is at a height of
  • $$0.1 m$$
  • $$1 m$$
  • $$9.8 m$$
  • $$32 m$$
The flowing water of a river possesses ...... energy.
  • gravitational
  • potential
  • electrical
  • kinetic
Which of the following is not a perfectly inelastic collision ?
  • Striking of two glass balls
  • A bullet striking a bag of sand
  • An electron captured by a proton
  • A man jumping into a moving cart
A block of mass $$20 kg$$ is pulled over a smooth inclined plane through $$3 m$$ as shown in the figure. The plane makes an angle of $${ 30 }^{ o }$$ with the base. The force applied is parallel to the base. $$\left( g=10m{ s }^{ -2 } \right) $$.
Assuming that no energy is lost otherwise, what is the gain in the P.E. of the block?
517162.jpg
  • $$30 J$$
  • $$20 J$$
  • $$300 J$$
  • $$600 J$$
The relationship between force and position is shown in the figure (in one dimensional case). Work done by the force in displacing a body from 
$$ X=1\  cm\  to\ $$$$X=5\  cm\  is$$:

371097.jpg
  • 700 ergs
  • 70 ergs
  • 60 ergs
  • 20 ergs
A stretched spring possesses:
  • kinetic energy
  • elastic potential energy
  • electric energy
  • magnetic energy
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
(i) What is the work done by the porter when he climbs up a height of 10 m $$\displaystyle (g\quad = 10\ {ms} ^{-2})$$? 
  • $$5kJ^2$$
  • $$50kJ$$
  • $$100kJ^2$$
  • $$5kJ$$
Which one of the following types of energy is possessed by a body when placed at a certain height?
  • Kinetic energy
  • Potential energy
  • Heat energy
  • Sound energy
  • None of these
A bullet of mass $$0.02$$ kg moving with a velocity of $$\displaystyle 30\ { ms }^{ -1 }$$ is brought to rest by a wooden plank. Calculate the work done on the bullet before it comes to rest.
  • $$-9$$
  • $$9$$
  • $$18$$
  • $$-18$$
Potential energy increases :
  • As the height increases
  • As the mass decreases
  • As the velocity increases
  • None of the above
Find the potential energy if a body is placed at a certain height of 5 m from the earth.
412338.jpg
  • 196 J
  • 200 J
  • 150 J
  • 300 J
  • None of these
The water stored in a reservoir possesses :
  • Kinetic energy
  • Muscular energy
  • Potential energy
  • Magnetic energy
The energy directly related to the speed of a moving body and its mass is:
  • kinetic
  • potential
  • solar
  • electric
A heavy object has .......  gravitational potential energy than a lighter one.
  • less
  • more
  • same
  • none of these
When an aeroplane takes off from the ground :
  • Kinetic energy increases and Potential energy decreases
  • Potential energy increases and Kinetic energy remains constant
  • Both Kinetic energy and Potential energy remain constant
  • Both Kinetic energy and Potential energy increase
When you climb a staircase, you spend______ energy and gain ____energy.
  • Kinetic - potential
  • Chemical - electrical
  • Muscular - kinetic
  • Muscular - potential
The energy that helps in burning of wood is :
  • Chemical
  • Electrical
  • Potential
  • Muscular
A plant usually stores its carbohydrates in its fruits. This process also shows the conversion of _____energy to _____energy.
  • Kinetic to potential
  • Mechanical to chemical
  • Solar to chemical
  • None of these
What is the least amount of energy required by a man to lift an object weighing 1000 N to a height of
2m ?
  • 500 J
  • 2000 N
  • 500 N
  • 2000 J
The energy present in petrol is :
  • Chemical
  • Kinetic
  • Potential
  • Heat
Which of the following does not have potential energy ?
  • An inflated balloon
  • Water in a flowing river
  • A fruit on the tree
  • A spinning top
The energy stored in food is :
  • Electrical
  • Heat
  • Chemical
  • Muscular
A torch converts________ energy to______ energy.
  • chemical, heat
  • electrical, chemical
  • chemical, light
  • light, electrical
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