MCQOPTIONS
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MCQOPTIONS
This section includes 133 Mcqs, each offering curated multiple-choice questions to sharpen your UPSEE knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If we throw a body upwards with a velocity of 4 m/s, at what height its kinetic energy reduces to half of the initial value? Take g = 10 m/s2 |
| A. | 4m |
| B. | 2m |
| C. | 1m |
| D. | 0.4m |
| Answer» E. | |
| 52. |
A system of three charges are placed as shown in the figure:If D >> d, the potential energy of the system is best given by |
| A. | \(\frac{1}{{4\pi {\epsilon_0}}}\left[ {\frac{{ - {q^2}}}{d} - \frac{{qQd}}{{2{D^2}}}} \right]\) |
| B. | \(\frac{1}{{4\pi {\epsilon_0}}}\left[ {\frac{{ - {q^2}}}{d} + \frac{{2qQd}}{{{D^2}}}} \right]\) |
| C. | \(\frac{1}{{4\pi {\epsilon_0}}}\left[ { + \frac{{{q^2}}}{d} + \frac{{qQd}}{{{D^2}}}} \right]\) |
| D. | \(\frac{1}{{4\pi {\epsilon_0}}}\left[ {\frac{{ - {q^2}}}{d} - \frac{{qQd}}{{{D^2}}}} \right]\) |
| Answer» E. | |
| 53. |
How much work is done in moving a charge of 4 C across two points having a P.D of 10 V? |
| A. | 40 J |
| B. | 0.4 J |
| C. | 2.5 J |
| D. | 4 J |
| Answer» B. 0.4 J | |
| 54. |
How many units of electric power will be consumed by 4 motors of 0.5 HP each in 8 hours? |
| A. | 11.768 units |
| B. | 11768 units |
| C. | 1/1768 units |
| D. | 117.68 units |
| Answer» B. 11768 units | |
| 55. |
A man lifts a luggage of 25 kg from the ground and puts it on the head, 2.5 m above the ground. If the value of g = 10 ms-2, then the value of work done by him on the luggage is: |
| A. | 22.5 J |
| B. | 225 J |
| C. | 625 J |
| D. | 220 J |
| Answer» D. 220 J | |
| 56. |
A block of mass m, lying on a smooth horizontal surface, is attached to a spring (of negligible mass) of spring constant k. The other end of the spring is fixed, as shown in the figure. The block is initially at rest in its equilibrium position. If now the block is pulled with a constant force F, the maximum speed of the block is: |
| A. | \(\frac{{2{\rm{F}}}}{{\sqrt {{\rm{mk}}} }}\) |
| B. | \(\frac{{\rm{F}}}{{\pi \sqrt {{\rm{mk}}} }}\) |
| C. | \(\frac{{\pi {\rm{F}}}}{{\sqrt {{\rm{mk}}} }}\) |
| D. | \(\frac{{\rm{F}}}{{\sqrt {{\rm{mk}}} }}\) |
| Answer» E. | |
| 57. |
A body is allowed to slide down a frictionless track from rest position at its top under gravity. The track ends in a circular loop of diameter D. Then, the minimum height of the inclined track ( in terms of D ) so that it may complete successfully the loop is |
| A. | 3D/4 |
| B. | 9D/4 |
| C. | 5D/4 |
| D. | 7D/4 |
| Answer» D. 7D/4 | |
| 58. |
If a body is transmitting torque T kgm at angular speed of θ radian/sec, then h.p. transmitted will be |
| A. | \(\frac{{{\rm{T\theta }}}}{{75}}\) |
| B. | \(\frac{{\rm{T}}}{{\rm{\theta }}}\) |
| C. | \(\frac{{{\rm{T\theta }}}}{{50}}\) |
| D. | Tθ |
| Answer» B. \(\frac{{\rm{T}}}{{\rm{\theta }}}\) | |
| 59. |
If the kinetic energy of an object is increased by 4 times then what will be the increment in speed of the object? |
| A. | 2 times |
| B. | 3 times |
| C. | 4 times |
| D. | remains same |
| Answer» B. 3 times | |
| 60. |
A uniform chain of mass m and length l is placed on a smooth horizontal table such that \(\frac{1}{4}\)th of its length is hanging from the edge of the table. The chain slips down. Find the kinetic energy of the chain when half of its length is hanging from the edge of the table. |
| A. | \(\frac{2}{{32}}mgl\) |
| B. | \(\frac{{mgl}}{4}\) |
| C. | \(\frac{2}{{15}}mgl\) |
| D. | \(\frac{3}{{32}}mgl\) |
| Answer» E. | |
| 61. |
If the kinetic energy of a body becomes four times of its initial value, then the new momentum |
| A. | will be three times of the initial value |
| B. | will be four times of the initial value |
| C. | will be two times of the initial value |
| D. | will remain unchanged |
| Answer» D. will remain unchanged | |
| 62. |
An object of mass 10 kg is moving with a uniform velocity of 6 ms-1. What is the kinetic energy possessed by the object. |
| A. | 180 J |
| B. | 18 J |
| C. | 360 J |
| D. | 1800 J |
| Answer» B. 18 J | |
| 63. |
If an airplane covers a distance of 4000 m and the work done is 20000 J, find the force applied. |
| A. | 50 N |
| B. | 0.2 N |
| C. | 10 N |
| D. | 5 N |
| Answer» E. | |
| 64. |
A student lifts a heavy book from the floor of a room to put it in the bookshelf at a height 2 m. For this process, the student takes 5 s. The work done by the student will depend upon ________. |
| A. | The height of the book shelf and the time taken |
| B. | The mass of the book, the height of the book shelf and the time taken |
| C. | The mass of the book and the time taken |
| D. | The weight of the book and the height of the bookshelf |
| Answer» E. | |
| 65. |
A particle of mass m and charge q is in an electric and magnetic field is given by\(E = 2\hat i + 3\hat j,\;B = 4\hat j + 6\hat k.\) The charged particle is shifted from the origin to the point P(x = 1; y = 1) along a straight path. The magnitude of the total work done is |
| A. | 0.35 q |
| B. | 0.15 q |
| C. | 25 q |
| D. | 5 q |
| Answer» E. | |
| 66. |
A body of mass 2kg is thrown up vertically with a kinetic energy of 500J. If the acceleration due to gravity is 10 m/s2, the height at which the kinetic energy of the body becomes half of the original values is _____ |
| A. | 12.5 m |
| B. | 10.2 m |
| C. | 8.5 m |
| D. | 6.75 m |
| Answer» B. 10.2 m | |
| 67. |
A potentiometer wire AB having length L and resistance 12r is joined to a cell D of EMF ϵ and internal resistance r. A cell C having emf \(\frac{\epsilon}{2}\) and internal resistance 3r is connected. The length AJ at which the galvanometer as shown in figure shows no deflection is |
| A. | \(\frac{5}{{12}}L\) |
| B. | \(\frac{{11}}{{12}}L\) |
| C. | \(\frac{{13}}{{24}}L\) |
| D. | \(\frac{{11}}{{24}}L\) |
| Answer» D. \(\frac{{11}}{{24}}L\) | |
| 68. |
A boy raises a box with a weight of 120 N from a height of 2 m. The work done by him is ________. |
| A. | 60 J |
| B. | 120 J |
| C. | 240 J |
| D. | 130 J |
| Answer» D. 130 J | |
| 69. |
An object of 5.0 kg is raised through a height of 2.0 m. The work done in the process is:(Take g = 9.8m/s2) |
| A. | 49 J |
| B. | 10 J |
| C. | 19.6 J |
| D. | 98 J |
| Answer» E. | |
| 70. |
A bicyclist comes to a skidding stop in 10 m. During this process, the force on the bicycle due to the road is 200 N and is directly opposed to the motion. The work done by the cycle on the road is: |
| A. | Zero |
| B. | -2000 J |
| C. | 1 J |
| D. | 2000 J |
| Answer» B. -2000 J | |
| 71. |
A ball is thrown vertically up with a velocity 20 m/s. At what height will its kinetic energy be half its original value? |
| A. | 5 m |
| B. | 20 m |
| C. | 10 m |
| D. | 15 m |
| Answer» D. 15 m | |
| 72. |
A mass of 150 g experiences a force of 100 N. Find the energy or work expended if the mass moves 10 cm. |
| A. | 1000 J |
| B. | 1 J |
| C. | 10 J |
| D. | 100 J |
| Answer» D. 100 J | |
| 73. |
Just before striking the ground, a 0.5 kg body had a kinetic energy of 980 J. if friction is ignored, from what height it was dropped. |
| A. | 980 m |
| B. | 5.0 m |
| C. | 200 m |
| D. | 24.5 m |
| Answer» D. 24.5 m | |
| 74. |
An object of mass 10 kg is moving with a uniform velocity of 4 ms-1. Find the kinetic energy possessed by the object |
| A. | 80 J |
| B. | 80 W |
| C. | 80 N |
| D. | 80 Pa |
| Answer» B. 80 W | |
| 75. |
A particle which is experiencing a force, is given by \(\;F = 3\hat i - 12\hat j\), undergoes a displacement of \(\;d = 4\hat i\). If the particle had a kinetic energy of 3 J at the beginning of the displacement, what is its kinetic energy at the end of the displacement? |
| A. | 9 J |
| B. | 15 J |
| C. | 12 J |
| D. | 10 J |
| Answer» C. 12 J | |
| 76. |
A battery with internal resistance r is connected in series with an external resistance R. Let Ur and UR represent the energy dissipated per unit time by the internal resistance r and external resistance R, respectively. If r = R, then the ratio Ur/UR is: |
| A. | 1/3 |
| B. | 1/2 |
| C. | 1 |
| D. | 2 |
| Answer» D. 2 | |
| 77. |
1 Watt = |
| A. | 1 Nm/s |
| B. | 1 Nm/hr |
| C. | 1000 Nm/s |
| D. | 1000 Nm/hr |
| Answer» B. 1 Nm/hr | |
| 78. |
A man lifts a weight of 20 kg to a height of 5 m from the ground. The work done by him is _____. [g = 10 ms-2] |
| A. | 1000 N |
| B. | 1000 C |
| C. | 1000 J |
| D. | 1000 Pa |
| Answer» D. 1000 Pa | |
| 79. |
An object of 10 kg is raised through a height of 2 m. The work done is (g = 9.8 m/s2) |
| A. | 196 J |
| B. | 98 J |
| C. | 19.6 J |
| D. | 4.9 J |
| Answer» B. 98 J | |
| 80. |
A solid sphere and solid cylinder of identical radii approach an incline with the same linear velocity (see figure). Both roll without slipping all throughout. The two climb maximum heights hsph and hcyl on the incline. The ratio \(\frac{{{{\rm{h}}_{{\rm{sph}}}}}}{{{{\rm{h}}_{{\rm{cyl}}}}}}\) is given by: |
| A. | 1 |
| B. | \(\frac{{14}}{{15}}\) |
| C. | \(\frac{2}{{\sqrt 5 }}\) |
| D. | \(\frac{4}{5}\) |
| Answer» C. \(\frac{2}{{\sqrt 5 }}\) | |
| 81. |
A man (mass = 50 kg) and his son (mass = 20 kg) are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of 0.70 m/s with respect to the man. The speed of the man with respect to the surface is: |
| A. | 0.28 ms-1 |
| B. | 0.20 ms-1 |
| C. | 0.47 ms-1 |
| D. | 0.14 ms-1 |
| Answer» C. 0.47 ms-1 | |
| 82. |
1 horse power is equal to ______ watt? |
| A. | 646 |
| B. | 700 |
| C. | 746 |
| D. | 500 |
| Answer» D. 500 | |
| 83. |
A device which converts chemical energy into electrical energy is called |
| A. | Motor |
| B. | Generator |
| C. | Moving coil meter |
| D. | Battery |
| Answer» E. | |
| 84. |
A force of 10 N acts on an object and the displacement is 7.5 m, in the direction of force. What is the work done in this case? |
| A. | 7500 J |
| B. | 750 J |
| C. | 75 J |
| D. | 0.75 J |
| Answer» D. 0.75 J | |
| 85. |
A sample of an ideal gas is taken through the cyclic process abca as shown in the figure. The change in the internal energy of the gas along the path ca is -180 J. The gas absorbs 250 J of heat along the path ab and 60 J along the path bc. The work done by the gas along the path abc is: |
| A. | 120 J |
| B. | 130 J |
| C. | 100 J |
| D. | 140 J |
| Answer» C. 100 J | |
| 86. |
Dams are constructed to collect water flowing in high altitude rivers. The stored water has a lot of |
| A. | Both KE and PE |
| B. | Kinetic energy (KE) |
| C. | potential energy (PE) |
| D. | Neither KE nor PE |
| Answer» D. Neither KE nor PE | |
| 87. |
A box of mass 1 kg is pulled through 1 m along a level floor by a horizontal force of 8 N. The box is then raised vertically on to a bench 2 m high. What is the total workdone on the box? (Take g = 10 m/s2) |
| A. | 18 J |
| B. | 28 J |
| C. | 8 J |
| D. | \(\sqrt{8^2+20^2} \ J\) |
| Answer» C. 8 J | |
| 88. |
A force acts on a 2 kg object so that its position is given as a function of time as x = 3t2 + 5. What is the work done by this force in first 5 seconds? |
| A. | 850 J |
| B. | 950 J |
| C. | 875 J |
| D. | 900 J |
| Answer» E. | |
| 89. |
Moment of inertia of a body about a given axis is 1.5 kg m2. Initially the body is at rest. In order to produce a rotational kinetic energy of 1200 J, the angular acceleration of 20 rad/s2 must be applied about the axis for a duration of: |
| A. | 2.5s |
| B. | 2s |
| C. | 5s |
| D. | 3s |
| Answer» C. 5s | |
| 90. |
A car of mass 800 Kg is moving on an expressway. In order to increase the speed of the car from 54km/hr to 90km/hr the work required to be done will be |
| A. | 150 KJ |
| B. | 160 KJ |
| C. | 250 KJ |
| D. | 200 KJ |
| Answer» C. 250 KJ | |
| 91. |
How much work is done in moving 2 Coulombs of charge across two points having a potential difference of 12 V? |
| A. | 6 Joule |
| B. | 18 Joule |
| C. | 24 Joule |
| D. | 12 Joule |
| Answer» D. 12 Joule | |
| 92. |
Power rating is related to resistance value. |
| A. | True |
| B. | False |
| Answer» C. | |
| 93. |
The power rating of a resistor determines the minimum power that it can handle safely. |
| A. | True |
| B. | False |
| Answer» C. | |
| 94. |
A resistor normally opens when it burns out. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 95. |
The watt is the unit of power. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 96. |
When the current through a 12 kΩ resistor is 8 mA, the power is |
| A. | 7.68 mW |
| B. | 768 mW |
| C. | 7.68 W |
| D. | 76.8 W |
| Answer» C. 7.68 W | |
| 97. |
A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume? |
| A. | 20.16 kWh |
| B. | 201.6 kWh |
| C. | 2.01 kWh |
| D. | 8.4 kWh |
| Answer» C. 2.01 kWh | |
| 98. |
A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately |
| A. | 120 V |
| B. | 1.2 V |
| C. | 12 V |
| D. | 6 V |
| Answer» D. 6 V | |
| 99. |
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be |
| A. | 2 W |
| B. | 1 W |
| C. | 5 W |
| D. | 0.5 W |
| Answer» B. 1 W | |
| 100. |
When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is |
| A. | Overheated |
| B. | Shorted |
| C. | Open |
| D. | Reversed |
| Answer» C. Open | |