JEE Questions for Physics Work Energy And Power Quiz 6 - MCQExams.com

A motor cycle is moving along a straight horizontal road with a speed V0. If the coefficient of friction between the tyres and the road is µ , the short distance in which the car can be stopped is :

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  • 2)
    Physics-Work Energy and Power-97723.png

  • Physics-Work Energy and Power-97724.png

  • Physics-Work Energy and Power-97725.png
A particle moves on a rough horizontal ground with some initial velocity v0. If 3/4 th of its K.E is lost in friction in time t0, the coefficient of friction between the particle and the ground is

  • Physics-Work Energy and Power-97727.png
  • 2)
    Physics-Work Energy and Power-97728.png

  • Physics-Work Energy and Power-97729.png

  • Physics-Work Energy and Power-97730.png
Velocity time graph of a particle of mass 2kg moving in a straight line is as shown in fig. Work done by all forces on the particle is
Physics-Work Energy and Power-97732.png
  • 400 J
  • –400 J
  • –200 J
  • 200 J
A solid sphere rolls without slipping and presses a spring of spring constant k as shown in Fig. Then the compression in the spring will be
Physics-Work Energy and Power-97734.png

  • Physics-Work Energy and Power-97735.png
  • 2)
    Physics-Work Energy and Power-97736.png

  • Physics-Work Energy and Power-97737.png

  • Physics-Work Energy and Power-97738.png
The blocks of mass m each are connected to a spring of spring constant k as shown. The maximum displacement in the block is
Physics-Work Energy and Power-97740.png

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  • 2)
    Physics-Work Energy and Power-97742.png

  • Physics-Work Energy and Power-97743.png

  • Physics-Work Energy and Power-97744.png

Physics-Work Energy and Power-97746.png

  • Physics-Work Energy and Power-97747.png
  • 2)
    Physics-Work Energy and Power-97748.png

  • Physics-Work Energy and Power-97749.png

  • Physics-Work Energy and Power-97750.png
The bob A of a simple pendulum is released when the string makes an angle of 450 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-97752.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 velocity of A
  • A comes to rest and B moves with the velocity of A
If W1, W2, W3 represent the work done in moving a particle from A to B along three different paths 1,2,3 respectively as shown in the gravitational field of a point mass m , find the correct relation between W1, W2 and W3
Physics-Work Energy and Power-97753.png
  • W1 > W2 > W3
  • W1 = W2 = W3
  • W1 < W2 < W3
  • W2 > W1 > W3
A stationary particle explodes into two particles of masses m1 and m2 which move in opposite directions, with velocities v1 and v2. The ratio of their kinetic energies (E1 / E2) is
  • m2/m1
  • m1/m2
  • 1
  • m1v2 / m2v1
Power supplied to a particle of mass 2 kg varies with time as P = 3 t2/2 watt, where t is in seconds. If velocity of particle at t = 0 is v = 0, the velocity of particle at t = 2 sec will be
  • 1 m/s
  • 4 m/s
  • 2 m/s
  • 2 √2m/s
Liquid of density ρ flows along a horizontal pipe of uniform area of cross section a with a velocity v through a right angled bend. What force should be applied to the bend to hold it in equilibrium?

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  • 2)
    Physics-Work Energy and Power-97757.png

  • Physics-Work Energy and Power-97758.png

  • Physics-Work Energy and Power-97759.png
A chain of length l and mass M is held on a frictionless table with (1/n)th part hanging over the edge. Work done in pulling the chain is directly proportional to
  • √n
  • n
  • n-3
  • n-2
A ball falls vertically on to a floor,with momentum p, and then bounces repeatedly, the coefficient of restitution is e. The total momentum imparted by the ball to the floor is

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  • 2)
    Physics-Work Energy and Power-97763.png

  • Physics-Work Energy and Power-97764.png

  • Physics-Work Energy and Power-97765.png
How much is the work done in pulling up a block of wood weighing 2KN for a length of 10m on a smooth plane inclined at an angle of 30o with the horizontal ?
  • 1.732 KJ
  • 17.32 KJ
  • 10 KJ
  • 100 KJ
A force of 7N, making an angle θ with the horizantal, acting on an object displaces it by 0.5m along the horizontal direction. If the object gains K.E. of 2J, what is the horizontal component of the force ?
  • 2N
  • 4 N
  • 1 N
  • 14 N
A 60 kg JATAN with 10 kg load on his head climbs 25 steps of 0.20m height each. what is the work done in climbing ? (g = 10 m/s2)
  • 5 J
  • 350 J
  • 100J
  • 3500J
The relationship between force and position is shown in the figure given (in one dimensional case) calculate the work done by the force in displacing a body from x = 0 cm to x = 5 cm
Physics-Work Energy and Power-97767.png
  • 30 ergs
  • 70 ergs
  • 20 ergs
  • 60 ergs
The force constant of a wire is K and that of the another wire is 3k when both the wires are stretched through same distance, if work done are W1 and W2 , then...

  • Physics-Work Energy and Power-97768.png
  • W2 = 0.33W1
  • W2 = W1
  • W2 = 3W1
A ball is released from the top of a tower. what is the ratio of work done by force of gravity in first, second and third second of the motion of the ball ? [hn ∝ (2n – 1)]
  • 1 : 2 : 3
  • 1 : 4 : 9
  • 1 : 3 : 5
  • 1: 5 : 3
A 8 kg mass moves along x - axis. Its accelerations as a function of its position is shown in the figure. What is the total work done on the mass by the force as the mass moves from x = 0 to x = 6cm ?
Physics-Work Energy and Power-97771.png
  • 48 × 10–3 J
  • 98 × 10–3 J
  • 4.8 × 10–3 J
  • 9.8 × 10–3 J
The work done by a force acting on a body is as shown in the graph. What is the total work done in covering an initial distance of 15cm?
Physics-Work Energy and Power-97772.png
  • 50J
  • 75J
  • 100J
  • 25J
A uniform chain of length L ans mass M is lying on a smooth table and one third of its is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on to the table is
  • MgL
  • MgL/3
  • MgL/9
  • MgL/18
A block of mass 5 kg is resting on a smooth surface. At what angle a force of 20N be acted on the body so that it will acquired a kinetic energy of 40J after moving 4m
  • 30o
  • 45o
  • 60o
  • 120o
Natural length of a spring is 60 cm, and its spring constant is 2000 N/m. A mass of 20kg is hung from it. The extension produced in the spring is..... (g = 9.8 m/s2)
  • 4.9 cm
  • 0.49 cm
  • 9.8 cm
  • 0.98 cm
If Wa, Wb, and Wc represent the work done in moving a particle from X to Y along three different path a, b, and c respectively (as shown) in the gravitational field of a point mass m, find the correct relation between Wa, Wb and Wc.
Physics-Work Energy and Power-97776.png
  • Wb > Wa > Wc
  • Wa< Wb < Wc
  • Wa > Wb > Wc
  • Wa = Wb = Wc
A toy car of mass 4 kg moves up a ramp under the influence of force F plotted against displacement x. The maximum height attained is given by (Take g = 10 m/s2)
Physics-Work Energy and Power-97777.png
  • ymax = 5m
  • ymax = 10m
  • ymax = 15m
  • ymax = 20m
A particle of mass 0.5kg travels in a straight line with velocity v = ax3/2 , Where a = 5–1/2S–1. The work done by the net force during its displacement from x = 0 to x = 2m is
  • 50 J
  • 45 J
  • 25 J
  • None of these
Given below is a graph between a variable force (F) (along y-axis) and the displaement (X) (along x-axis) of a particle in one dimension. The work done by the force in the displacement interval between 0m and 30m is
Physics-Work Energy and Power-97779.png
  • 275 J
  • 325 J
  • 400 J
  • 300 J
Force F on a particle moving in a straight line varies with distance d as shown in the figure. The work done on the particle during its displacement of 12m.
Physics-Work Energy and Power-97780.png
  • 27 J
  • 24 J
  • 36 J
  • 26 J
A spring with spring constant K when stretched through 2 cm the potential energy is U. If it is stretched by 6 cm. The potential energy will be......
  • 6U
  • 3U
  • 9U
  • 18U
If linear momentum of body is increased by 1.5%, its kinetic energy increases by.......%
  • 0%
  • 10%
  • 2.25%
  • 3%
With what velocity should a student of mass 40 kg run so that his kinetic energy becomes 160 J ?
  • 4 m/s
  • √8 m/s
  • 16 m/s
  • 8 m/s
A body of mass 1 kg is thrown upwords with a velocity 20 m/s. It momentarily comes to rest after a height 18 m. How much energy is lost due to air friction. (g = 10 m/s2)
  • 20 J
  • 30 J
  • 40 J
  • 10 J
Two bodies of masses m1 and m2 have equal kinetic energies. If P1 and P2 are their respective momentum, what is ratio of P2 : P1 ?

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  • 2)
    Physics-Work Energy and Power-97785.png

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Two bodies of masses m and 3m have same momentum. their respective kinetic energies E1 and E2 are in the ratio.....
  • 1 : 3
  • 3 : 1
  • 1 : √3
  • 1 : 6
What is the velocity of the bob of a simple pendulum at its mean position, if it is able to rise to vertical height of 18 cm (Take g = 10 m/s2)
Physics-Work Energy and Power-97790.png
  • 0.4 m/s
  • 4 m/s
  • 6 m/s
  • 0.6 m/s
A force → time graph for a linear motion is shown in figure where the segments are circular. what is linear momentum gained between zero and 8 second ?
Physics-Work Energy and Power-97792.png
  • -2πN S
  • 0 NS
  • 4πNS
  • -6πNS
A particle is dropped from a height-h. A constant horizontal velocity is given to the particle. Taking g to be constant everywhere kinetic energy E of the particle with respect to time t is correctly shown in....

  • Physics-Work Energy and Power-97793.png
  • 2)
    Physics-Work Energy and Power-97794.png

  • Physics-Work Energy and Power-97795.png

  • Physics-Work Energy and Power-97796.png
Which of the following graph is correct between kinetic energy (E), potential energy (U) and height (h) from the ground of the particle.

  • Physics-Work Energy and Power-97797.png
  • 2)
    Physics-Work Energy and Power-97798.png

  • Physics-Work Energy and Power-97799.png

  • Physics-Work Energy and Power-97800.png
An engine pump is used to pump a liquid of density ρ continuosly through a pipe of cross-sectional area A. If the speed of flow of the liquied in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is

  • Physics-Work Energy and Power-97801.png
  • 2)
    Physics-Work Energy and Power-97802.png

  • Physics-Work Energy and Power-97803.png

  • Physics-Work Energy and Power-97804.png

Physics-Work Energy and Power-97806.png
  • 5 J
  • 10 J
  • 8 J
  • 16 J
A spring is compressed by 1 cm by a force of 4 N. Find the potential energy of the spring when it is compressed by 10 cm.
  • 2 J
  • 0.2J
  • 20 J
  • 200 J
when 2kg mass hangs to a spring of length 50 cm, the spring stretches by 2 cm. The mass is pulled down until the length of the spring becomes 60 cm. What is the amount of elastic energy stored in the spring in this condition, if g = 10 m/s2.
  • 10 J
  • 2 J
  • 2.5 J
  • 5 J
A particle of mass 0.1 kg is subjected to a force which varies with distance as shown in figure. If it starts its journey from rest at x = 0. What is the particle's velocity square at x = 6 cm ?
Physics-Work Energy and Power-97810.png
  • 0 (m/s)2
  • 240√2 (m/s)2
  • 240√3 (m/s)2
  • 480 (m/s)2
If the K.E. of a body is increased by 44%, its momentum will increase by.......
  • 20 %
  • 22 %
  • 2 %
  • 120 %
A bullet of mass 0.10 kg moving with a speed of 100 m/s enters a wooden block and is stopped after a distance of 0.20 m. what is the average resistive force exerted by the block on the bullet ?
  • 2.5 × 102 N
  • 25 N
  • 25 × 102 N
  • 2.5 × 104 N
A simple pendulum is released from A as shown in figure. If 10 g and 100 cm represent the mass of the bob and length of the pendulum. what is the gain in K.E. at B? ( g = 10 m/s2)
Physics-Work Energy and Power-97814.png
  • 0.5 J
  • 5 × 10–2 J
  • 5 J
  • 0.5 × 10–3 J
A sphere of mass m moving the velocity v enters a hanging bag of sand and stops. If the mass of the bag is M and it is raised by height h, then the velocity of the sphere was

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  • 2)
    Physics-Work Energy and Power-97816.png

  • Physics-Work Energy and Power-97817.png

  • Physics-Work Energy and Power-97818.png
A particle is acted upon by a force F which varies with position x as shown in figure. If the particle at x = 0 has kinetic energy of 20 J. Then the calculate the kinetic energy of the particle at x = 16 cm.
Physics-Work Energy and Power-97820.png
  • 45 J
  • 30 J
  • 70 J
  • 135 J
If the water falls from a dam into a turbine wheel 19.6 m below, then the velocity of water at the turbine is ...... ( g = 9.8 m/s2)
  • 9.8 m/s
  • 19.6 m/s
  • 39.2 m/s
  • 98.0 m/s
0:0:1


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