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CBSE Questions for Class 11 Medical Physics Work, Energy And Power Quiz 4 - MCQExams.com

A force F=(2+x) acts on a particle in x-direction where F is in newton and x in meter. Find the work done by this force during a displacement from x=1.0 m to x=2.0 m.
  • 3.5 J
  • 7 J
  • 4.5 J
  • 5.5 J
A force F=(3tˆi+5ˆj)N acts on a body due to which its displacement varies as S=(2t2ˆi5ˆj)m. Work done by this force in 2 second is:
  • 32 J
  • 24 J
  • 46 J
  • 20 J
Equal net forces act on two different blocks A and B of masses m and 4m respectively. For same displacement, identify the correct statement.
  • Their kinetic energies are in the ratio KAKB=14
  • Their speeds are in the ratio vAvB=11
  • Work done on the blocks are in the ratio WAWB=11
  • All of the above
A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic energy of the block increases by 40 J in 1 s. The tension in the string is:
  • F
  • Mg
  • F+Mg
  • FMg
A particle of mass m moves on a straight line with its velocity varying with the distance travelled according to the equation v=αx, where a is a constant. Find the total work done by all the forces during a displacement from x=0 to x=d.
  • 12ma2b
  • 14ma2b
  • ma2b
  • 2 ma2b
A player kicks a ball of mass 250 g at the centre of a field. The ball leaves his foot with a speed of 10 m/s. Find the work done by the player on the ball.
  • 10.5J
  • 12.5J
  • 1.5J
  • 2.5J
A block is constrained to move along x-axis under a force F=-2x. Here, F is in newton and x in metre. Find the work done by this force when the block is displaced from x=2 m to x=-4 m.
  • -4 J
  • -8 J
  • -12 J
  • -16 J
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60kmh1
  • 208333J
  • 208333J
  • 209333J
  • 207333J
Certain force acting on a 20 kg mass changes its velocity from 5ms1 to 2ms1. Calculate the work done by the force.
  • 210J.
  • 210J.
  • 105J.
  • 420J.
An object of mass, m is moving with a constant velocity v. How much work should be done on the object in order to bring the object to rest ?
  • 12mv2
  • 12mv2
  • mv2
  • 12mv
A block is constrained to move along x-axis under a force F=4x2(x0). Here, F is in newton and x in metre. Find the work done by this force when the block is displaced from x=4 m to x=2 m.
  • -1 J
  • -2 J
  • -3 J
  • -4 J
A block of mass 30 kg is being brought down by a chain. If the block acquires a speed of 40 cm/s in dropping down 2 m. Find the work done by the chain during the process. (g=10m/s2)
  • -297.6 J
  • -375 J
  • -597.6 J
  • -674.6 J
A bullet of mass 20 g moving with a velocity of 500 m/s, strikes a tree and goes out from the other side with a velocity of 400 m/s. Calculate the work done by the bullet (in joules) in passing through the tree.
  • 900J
  • 800J
  • 950J
  • 500J
Sania, a high-board diver of mass 50 kg is diving from a height of 30 m into a pool (see figure given). What is the potential energy of Sania at point A ? (g=10ms2)

246313_f049ad05e7424cd698a304b08679cf1a.png
  • 5000J
  • 10000J
  • 15000J
  • 20000J
Energy associated with moving objects is called:
  • Potential energy
  • Kinetic energy
  • No energy
  • Work
Flowing water possess same energy as :
  • Water in a water tank
  • A stationery object
  • Flowing air
  • None of these
Water stored in a dam primarily possesses
  • Heat energy
  • Electrical energy
  • Kinetic energy
  • Potential energy
The gravitational potential energy possessed by a body is by virtue of its _________.
  • position
  • velocity
  • acceleration
  • temperature
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
  • does not change
  • becomes twice of initial
  • becomes 4 times of initial
  • becomes 16 times of initial
Which of the following is an example of an object with Kinetic Energy?
  • Watch spring
  • Bent bow
  • Stone at a height
  • Car moving along the road
The moving striker of the carom board will possess------ energy
  • Kinetic
  • Potential
  • Solar
  • Electric
Potential energy of a body depends on its:
  • motion
  • colour
  • mass
  • none of these
Which one of the following possesses potential energy?
  • Moving vehicle on the road
  • A running athlete
  • Stone on the road
  • A stretched rubber band
An overhead tank having some water possesses .......... energy.
  • Kinetic
  • Potential
  • Thermal
  • Electrical
Energy possessed by a body by virtue of its motion is :
  • Potential energy
  • Kinetic energy
  • Chemical energy
  • Electrical energy
A student sitting at the top of a tree has ............ than the student who is sitting on the ground.
  • less potential energy
  • more potential energy
  • more kinetic energy
  • more gravitational energy
The energy directly related to the speed of a moving body and its mass is:
  • Kinetic
  • Potential
  • Solar
  • Electric
Energy possessed by a body by virtue of its position at a height is :
  • Kinetic energy
  • Chemical energy
  • Potential energy
  • Magnetic energy
A heavy object has ---- potential energy than a lighter one
  • Less
  • More
  • Same
  • None of these
Two weights of 5 kg and 10 kg are placed on a horizontal table of height 1.5 m. Which will have more potential energy?
  • 5 kg
  • 10 kg
  • Both will have equal energy
  • None of the above
A solar cell converts solar energy into:
  • Chemical energy
  • Light energy
  • Electrical energy
  • Muscular energy
From the following statements find the one that is NOT correct:
  • A flying bird has both potential and kinetic energy.
  • A ball rolling on the ground has kinetic energy but no mechanical energy.
  • A stretched rubber band has potential energy
  • Chemical energy can be converted into electrical energy
The form of energy that wood can be categorized into is:
  • chemical energy
  • electrical energy
  • potential energy
  • muscular energy
An atom bomb converts __________ into heat and sound energy.
  • electrical energy
  • heat energy
  • mechanical energy
  • atomic energy
Law of conservation of energy states that:
  • energy cannot be destroyed but can be created and transformed from one form to another
  • energy exists in only one form
  • energy exists in many forms but it cannot be transformed
  • energy can neither be created nor be destroyed but can be transformed from one form to another
The form of energy present in a wound spring is:
  • chemical
  • heat energy
  • magnetic
  • mechanical
A wound spring has:
  • chemical energy
  • magnetic energy
  • mechanical energy
  • muscular energy
A ball of mass 3 kg collides with a wall with velocity 10m/sec at an angle of 30 with the wall and after collision reflects at the same angle with the same speed. The change in momentum of ball in MKS unit is-
  • 20
  • 30
  • 15
  • 45
Two identical 5 kg blocks are moving with same speed of 2m/s towards each other along a friction-less horizontal surface. The two blocks collide, stick together and come to rest. Consider two blocks as a system, the work done on the system by the external forces will be:
  • 20 Joule
  • 20 Joule
  • 0 Joule
  • None of these
A position dependent force F=72x+3x2N acts on a small object of mass 2kg to displace it from x=0 to x=5m. The work done in joules is-
  • 70
  • 270
  • 35
  • 135
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
A particle of mass m1 moving with a velocity of 5m/s collides head on with a stationary particle of mass m2. After collision both the particle move with a common velocity of 4m/s, then the value m1/m2 is:
  • 4:1
  • 2:1
  • 1:8
  • 1:2
A force of 10 N acts on a body of 2 kg mass for a distance of 1 m. The kinetic energy received by the body is:
  • 20 J
  • 10 J
  • 5 J
  • 2.5 J
A time dependent force F = 10 t is applied on 10 kg block. Find out the work done by F in 2 seconds.
  • 40 J
  • 20 J
  • 120 J
  • 60 J
Force shown acts for 2 seconds. Find out work done by force F on 10 kg in 3 seconds.
301887_761b4a987fc1439fa0f106fe720cb995.png
  • 30 J
  • 20 J
  • 50 J
  • 60 J
A force acts on a 3 gm particle in such a way that the position of the particle as a function of time is given by x=3t4t2+t3, where x is in meters and t is in seconds. The work done during the first 4 second is:
  • 384mJ
  • 168mJ
  • 528mJ
  • 541mJ
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
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
The diagrams represent the potential energy U as a function of the inter-atomic distance r. Which diagram corresponds to stable molecules found in nature.
The work done by the frictional force on a surface in drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing force N (coefficient of friction μk ) is : 
  • 4πr2μKN
  • 2πr2μKN
  • 2πrμKN
  • Zero
0:0:2


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