JEE Questions for Physics Work Energy And Power Quiz 10 - MCQExams.com

A body at rest breaks up into 3 parts. If 2 parts having equal masses fly off perpendicularly each after with a velocity of 12 m/s, then the velocity of the third part which has 3 times mass of each part is

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    Physics-Work Energy and Power-98097.png

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The bob A of a simple pendulum is released when the string makes an angle of 45° with the vertical. It hits another bob B of the same material and same mass kept at rest on the table. If the collision is elastic
Physics-Work Energy and Power-98101.png
  • Both A and B rise to the same height
  • Both A and B come to rest at B
  • Both A and B move with the same velocity of A
  • A comes to rest and B moves with the velocity of A
A big ball of mass M, moving with velocity u strikes a small ball of mass m, which is at rest. Finally small ball obtains velocity u and big ball v. Then, what is the value of v?

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    Physics-Work Energy and Power-98103.png

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A body of mass 5 kg moving with a velocity 10 m/s collides with another body of the mass 20 kg at rest and comes to rest. The velocity of the second body due to collision is
  • 2.5 m/s
  • 5 m/s
  • 7.5 m/s
  • 10 m/s
A body of mass M1 collides elastically with another mass M2 at rest. There is maximum transfer of energy when

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    Physics-Work Energy and Power-98109.png

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  • 2)
    Physics-Work Energy and Power-98158.png

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A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is
  • 2 kg
  • 1.2 kg
  • 3 kg
  • 1.5 kg
A body of mass M moves with velocity v and collides elastically with a another body of mass m (M >> m) at rest, then the velocity of body of mass m is
  • v
  • 2v
  • v/2
  • zero
Four smooth steel balls of equal mass at rest are free to move along a straight line without friction. The first ball is given a velocity of 0.4 m/s. It collides head on with the second elastically, the second one similarly with the third and so on. The velocity of the last ball is
  • 0.4 m/s
  • 0.2 m/s
  • 0.1 m/s
  • 0.05 m/s
A space craft of mass ‘M’ and moving with velocity ‘v’ suddenly breaks in two pieces of same mass m. After the explosion one of the mass ‘m’ becomes stationary. What is the velocity of the other part of craft?

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    Physics-Work Energy and Power-98114.png

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In an inelastic collision
  • Only momentum is conserved
  • Only kinetic energy is conserved
  • Neither momentum nor kinetic energy is conserved
  • Both momentum and kinetic energy are conserved
Three identical spherical balls A, B and C are placed on a table as shown in the figure along a straight line. B and C are at rest initially. The ball A hits B head on with a speed of 10 ms–1. Then, after all collisions (assumed to be elastic) A and B are brought to rest and C takes off with a velocity of
Physics-Work Energy and Power-98118.png
  • 5 ms–1
  • 10 ms–1
  • 2.5 ms–1
  • 7.5 ms–1
Quantity/Quantities remaining constant in a collision is/are
  • Momentum, kinetic energy and temperature
  • Momentum but not kinetic energy and temperature
  • Kinetic energy and temperature but not momentum
  • None of the above
A ball dropped from a height of 2 m rebounds to a height of 1.5 m after hitting the ground. Then, the percentage of energy lost is
  • 25
  • 30
  • 50
  • 100
  • 200
Two masses of 0.25 kg each moves towards each other with speed 3 ms–1 and I ms–1 collide and stick together. Find the final velocity.
  • 0.5 ms–1
  • 2 ms–1
  • 1 ms–1
  • 0.25 ms–1
The coefficient of restitution e for a perfectly inelastic collision is
  • 1
  • 0
  • ∞
  • –1
Two identical mass M moving with velocity u1 and u2 collide perfectly inelastically. The loss in energy is

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    Physics-Work Energy and Power-98122.png

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A mass of 10 g moving with a velocity of 100 cm/s strikes a pendulum bob of mass 10 g. The two masses stick together. The maximum height reached by the system now is (g = 10 m/s2)
  • zero
  • 5 cm
  • 2.5 cm
  • 1.25 cm
A body of mass 4 kg moving with velocity 12 m/s collides with another body of mass 6 kg at rest. If two bodies stick together after collision, then the loss of kinetic energy of system is
  • zero
  • 288 J
  • 172.8 J
  • 144 J
A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?
  • Momentum and kinetic energy
  • Kinetic energy alone
  • Momentum alone
  • Neither momentum nor kinetic energy
A body of mass 2 kg moving with a velocity of 3 m/sec collides head on with a body of mass 1 kg moving in opposite direction with a velocity of 4 m/sec. After collision, two bodies stick together and move with a common velocity which in m/sec is equal to
  • 1/4
  • 1/3
  • 2/3
  • 3/4
A body of mass m moving with a constant velocity v hits another body of the same mass moving with the same velocity v but in the opposite direction and sticks to it. The velocity of the compound body after collision is
  • v
  • 2v
  • zero
  • v/2
Two bodies of masses 0.1 kg and 0.4 kg move towards each other with the velocities 1 m/s and 0.1 m/s respectively, after collision they stick together. In 10 sec the combined mass travels
  • 120 m
  • 0.12 m
  • 12 m
  • 1.2 m
A bag (mass M) hangs by a long thread and a bullet (mass m) comes horizontally with velocity v and gets caught in the bag. Then, for the combined (bag + bullet) system

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A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be
  • 100%
  • 95%
  • 5%
  • 50%

Physics-Work Energy and Power-98136.png

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    Physics-Work Energy and Power-98138.png

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If a skater of weight 3 kg has initial speed 32 m/s and second one of weight 4 kg has 5 m/s. After collision, they have speed (couple) 5 m/s. Then, the loss in K.E. is
  • 48 J
  • 96 J
  • zero
  • None of these
A ball is dropped from height 10 m. Ball is embedded in sand 1 m and stops, then
  • Only momentum remains conserved
  • Only kinetic energy remains conserved
  • Both momentum and K.E. are conserved
  • Neither K.E. nor momentum is conserved
A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be

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    Physics-Work Energy and Power-98144.png

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A body of mass m1 is moving with a velocity V. It collides with another stationary body of mass m2. They get embedded At the point of collision, the velocity of the system
  • Increases
  • Decreases but does not become zero
  • Remains same
  • Become zero
A ball hits the floor and rebounds after inelastic collision. In this case
  • The momentum of the ball just after the collision is the same as that just before the collision
  • The mechanical energy of the ball remains the same in the collision
  • The total momentum of the ball and the Earth is conserved
  • The total energy of the ball and the Earth is conserved
If W1, W2 and W3 represent the work done in moving a particle from A to B along three different paths 1, 2 and 3 respectively (as shown) in the gravitational field of a point mass in, find the correct relation between W1, W2 and W3.
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    Physics-Work Energy and Power-98151.png

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A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest
Physics-Work Energy and Power-98154.png
  • 6 J
  • 5 J
  • 8 J
  • 2 J
A ball of mass 0.2 kg rests on a vertical post of height 5 m. A bullet of mass 0.01 kg, travelling with a velocity V m/s in a horizontal direction, hits the centre of the ball. After the collision, the ball and bullet travel independently. The ball hits the ground at a distance of 20 m and the bullet at a distance of 100 m from the foot of the post. The initial velocity V of the bullet is
Physics-Work Energy and Power-98162.png
  • 250 m/s
  • 2)
    Physics-Work Energy and Power-98163.png
  • 400 m/s
  • 500 m/s

Physics-Work Energy and Power-98165.png
  • At point away from the origin, the particle is in unstable equilibrium
  • For any finite non-zero value of x, there is a force directed away from the origin
  • If its total mechanical energy is k/2, it has its minimum kinetic energy at the origin
  • For small displacements for x 0, the motion is simple harmonic
An open knife edge of mass ‘m’ is dropped from a height ‘h’ on a wooden floor, lithe blade penetrates upto the depth ‘d’ into the wood, the average resistance offered by the wood to the knife edge is

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    Physics-Work Energy and Power-98168.png

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Consider the following two statements
I. Linear momentum of a system of particles is zero
II. Kinetic energy of a system of particles is zero, Then
  • I implies II and II implies I
  • I does not imply II and II does not imply I
  • I implies II but II does not imply I
  • I does not imply II but II implies I
A shell is fired from a cannon with velocity v m/sec at an angle θ with the horizontal direction. At the highest point in its path it explodes into two pieces of equal mass. One of the pieces retraces its path to the cannon and the speed in m/sec of the other piece immediately after the explosion is

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  • 2)
    Physics-Work Energy and Power-98173.png

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  • zero
  • 2)
    Physics-Work Energy and Power-98178.png

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Consider elastic collision of a particle of mass m moving with a velocity u with another particle of the same mass at rest. After the collision the projectile and the struck particle move in directions making angles θ1 and θ2 respectively with the initial direction of motion. The sum of the angles θ1 + θ2, is
  • 45o
  • 90o
  • 135o
  • 180o
Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are v and 2v, respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at A, these two particles will again reach the point A
Physics-Work Energy and Power-98182.png
  • 4
  • 3
  • 2
  • 1
A particle P moving with speed v undergoes a head on elastic collision with another particle Q of identical mass but at rest. After the collision

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  • 2)
    Physics-Work Energy and Power-98185.png

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  • 2)
    Physics-Work Energy and Power-98190.png
  • 2

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Two identical cylindrical vessels with their bases at same level each contains a liquid of density ρ. The height of the liquid in one vessel is h1 and that in the other vessel is h2. The area of either base is A. The work done by gravity in equalising the levels when the two vessels are connected, is

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  • 2)
    Physics-Work Energy and Power-98194.png

  • Physics-Work Energy and Power-98195.png

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A mass of M kg is suspended by a weightless string, horizontal force that is required to displace it until the string makes an angle of 45o with the initial vertical direction is

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  • 2)
    Physics-Work Energy and Power-98199.png

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A particle is placed at the origin and a force F = kx is acting on it (where k is positive constant). If U(O) = 0, the graph of U(x) versus x will be (where U is the potential energy function)

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    Physics-Work Energy and Power-98204.png

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The relationship between force and position is shown in the figure given (in one dimensional case). The work done by the force in displacing a body from x = 1 cm to x = 5cm is
Physics-Work Energy and Power-98208.png
  • 20 ergs
  • 60 ergs
  • 70 ergs
  • 700 ergs
The pointer reading v / s load graph for a spring balance is as given in the figure. The spring constant is
Physics-Work Energy and Power-98210.png
  • 0.1 kg/cm
  • 5 kg/cm
  • 0.3 kg/cm
  • 1 kg/cm
A force-time graph for a linear motion is shown in figure where the segments are circular. The linear momentum gained between zero and 8 sec is
Physics-Work Energy and Power-98212.png

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  • 2)
    Physics-Work Energy and Power-98214.png

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Adjacent figure shows the force-displacement graph of a moving body, the work done in displacing body from x = 0 to x = 35 m is equal to
Physics-Work Energy and Power-98217.png
  • 50 J
  • 25 J
  • 287.5 J
  • 200 J
0:0:1


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