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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 6951. |
Which of the following parameters does not characterize the thermodynamic state of matter [CPMT 2001; AIEEE 2003] |
| A. | Volume |
| B. | Temperature |
| C. | Pressure |
| D. | Work |
| Answer» E. | |
| 6952. |
The specific heat of hydrogen gas at constant pressure is \[{{C}_{P}}=3.4\times {{10}^{3}}cal/kg{{\,}^{o}}C\] and at constant volume is \[{{C}_{V}}=2.4\times {{10}^{3}}cal/kg{{\,}^{o}}C.\]If one kilogram hydrogen gas is heated from \[{{10}^{o}}C\] to \[{{20}^{o}}C\] at constant pressure, the external work done on the gas to maintain it at constant pressure is [MP PMT 1995; DPMT 2001] |
| A. | \[{{10}^{5}}\,\]cal |
| B. | \[{{10}^{4}}\]cal |
| C. | \[{{10}^{3}}\] cal |
| D. | \[5\times {{10}^{3}}\]cal |
| Answer» C. \[{{10}^{3}}\] cal | |
| 6953. |
Which of the following is not a thermodynamics co-ordinate [AIIMS 2001] |
| A. | P |
| B. | T |
| C. | V |
| D. | R |
| Answer» E. | |
| 6954. |
In a given process for an ideal gas, \[dW=0\]and \[dQ |
| A. | The temperature will decrease |
| B. | The volume will increase |
| C. | The pressure will remain constant |
| D. | The temperature will increase |
| Answer» B. The volume will increase | |
| 6955. |
Which of the following can not determine the state of a thermodynamic system [AFMC 2001] |
| A. | Pressure and volume |
| B. | Volume and temperature |
| C. | Temperature and pressure |
| D. | Any one of pressure, volume or temperature |
| Answer» E. | |
| 6956. |
If \[\Delta Q\] and \[\Delta W\] represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as [Roorkee 2000] |
| A. | \[\Delta Q=\Delta U+\Delta W\] |
| B. | \[\Delta Q=\Delta U-\Delta W\] |
| C. | \[\Delta Q=\Delta W-\Delta U\] |
| D. | \[\Delta Q=-\Delta W-\Delta U\] where \[\Delta U\] is the internal energy |
| Answer» C. \[\Delta Q=\Delta W-\Delta U\] | |
| 6957. |
A perfect gas contained in a cylinder is kept in vacuum. If the cylinder suddenly bursts, then the temperature of the gas [MH CET 1999] |
| A. | Remains constant |
| B. | Becomes zero |
| C. | Increases |
| D. | Decreases |
| Answer» B. Becomes zero | |
| 6958. |
If 150 J of heat is added to a system and the work done by the system is 110 J, then change in internal energy will be [AMU (Engg.) 1999; BHU 2000] |
| A. | 260 J |
| B. | 150 J |
| C. | 110 J |
| D. | 40 J |
| Answer» E. | |
| 6959. |
In thermodynamic process, 200 Joules of heat is given to a gas and 100 Joules of work is also done on it. The change in internal energy of the gas is [AMU (Engg.) 1999] |
| A. | 100 J |
| B. | 300 J |
| C. | 419 J |
| D. | 24 J |
| Answer» C. 419 J | |
| 6960. |
The internal energy of an ideal gas depends upon [RPMT 1997; MP PMT 1999; CPMT 2003] |
| A. | Specific volume |
| B. | Pressure |
| C. | Temperature |
| D. | Density |
| Answer» D. Density | |
| 6961. |
A thermo-dynamical system is changed from state \[({{P}_{1}},\,{{V}_{1}})\] to \[({{P}_{2}},\,{{V}_{2}})\] by two different process. The quantity which will remain same will be [RPET 1999] |
| A. | \[\Delta \,Q\] |
| B. | \[\Delta \,W\] |
| C. | \[\Delta Q+\Delta W\] |
| D. | \[\Delta Q-\Delta W\] |
| Answer» E. | |
| 6962. |
When the amount of work done is 333 cal and change in internal energy is 167 cal, then the heat supplied is [AFMC 1998] |
| A. | 166 cal |
| B. | 333 cal |
| C. | 500 cal |
| D. | 400 cal |
| Answer» D. 400 cal | |
| 6963. |
First law thermodynamics states that [KCET 1999] |
| A. | System can do work |
| B. | System has temperature |
| C. | System has pressure |
| D. | Heat is a form of energy |
| Answer» E. | |
| 6964. |
110 J of heat is added to a gaseous system, whose internal energy change is 40 J, then the amount of external work done is [CBSE PMT 1993; DPMT 1996, 03; AFMC 1999; JIPMER 2000; MH CET 2000; Pb. PMT 2003] |
| A. | 150 J |
| B. | 70 J |
| C. | 110 J |
| D. | 40 J |
| Answer» C. 110 J | |
| 6965. |
A container of volume \[1{{m}^{3}}\]is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vacuum. The whole system is thermally isolated from its surroundings. The partition is removed and the gas expands to occupy the whole volume of the container. Its temperature now would be [Manipal MEE 1995] |
| A. | 300 K |
| B. | 239 K |
| C. | 200 K |
| D. | 100 K |
| Answer» B. 239 K | |
| 6966. |
A system performs work \[\Delta W\] when an amount of heat is\[\Delta Q\] added to the system, the corresponding change in the internal energy is \[\Delta U\]. A unique function of the initial and final states (irrespective of the mode of change) is [CPMT 1981; J & KCET 2004] |
| A. | \[\Delta Q\] |
| B. | \[\Delta W\] |
| C. | \[\Delta U\] and \[\Delta Q\] |
| D. | \[\Delta U\] |
| Answer» E. | |
| 6967. |
Find the change in internal energy of the system when a system absorbs 2 kilocalorie of heat and at the same time does 500 joule of work [EAMCET 1984] |
| A. | 7900 J |
| B. | 8200 J |
| C. | 5600 J |
| D. | 6400 J |
| Answer» B. 8200 J | |
| 6968. |
Work done on or by a gas, in general depends upon the |
| A. | Initial state only |
| B. | Final state only |
| C. | Both initial and final states only |
| D. | Initial state, final state and the path |
| Answer» E. | |
| 6969. |
First law of thermnodynamics is given by [CPMT 1977, 91] |
| A. | \[dQ=dU+PdV\] |
| B. | \[dQ=dU\times PdV\] |
| C. | \[dQ=(dU+dV)\,P\] |
| D. | \[dQ=PdU+dV\] |
| Answer» B. \[dQ=dU\times PdV\] | |
| 6970. |
A particle is moving with a constant speed along a straight line path. A force is not required to [AFMC 2001] |
| A. | Increase its speed |
| B. | Decrease the momentum |
| C. | Change the direction |
| D. | Keep it moving with uniform velocity |
| Answer» E. | |
| 6971. |
A bird weighs 2 kg and is inside a closed cage of 1 kg. If it starts flying, then what is the weight of the bird and cage assembly [AFMC 1997] |
| A. | 1.5 kg |
| B. | 2.5 kg |
| C. | 3 kg |
| D. | 4 kg |
| Answer» D. 4 kg | |
| 6972. |
Newton's first law of motion describes the following [MP PMT 1996] |
| A. | Energy |
| B. | Work |
| C. | Inertia |
| D. | Moment of inertia |
| Answer» D. Moment of inertia | |
| 6973. |
A boy sitting on the topmost berth in the compartment of a train which is just going to stop on a railway station, drops an apple aiming at the open hand of his brother sitting vertically below his hands at a distance of about 2 meter. The apple will fall [CPMT 1986] |
| A. | Precisely on the hand of his brother |
| B. | Slightly away from the hand of his brother in the direction of motion of the train |
| C. | Slightly away from the hand of his brother in the direction opposite to the direction of motion of the train |
| D. | None of the above |
| Answer» C. Slightly away from the hand of his brother in the direction opposite to the direction of motion of the train | |
| 6974. |
A man getting down a running bus falls forward because [CPMT 1981] |
| A. | Due to inertia of rest, road is left behind and man reaches forward |
| B. | Due to inertia of motion upper part of body continues to be in motion in forward direction while feet come to rest as soon as they touch the road |
| C. | He leans forward as a matter of habit |
| D. | Of the combined effect of all the three factors stated in, and |
| Answer» C. He leans forward as a matter of habit | |
| 6975. |
Inertia is that property of a body by virtue of which the body is [MGIMS Wardha 1982] |
| A. | Unable to change by itself the state of rest |
| B. | Unable to change by itself the state of uniform motion |
| C. | Unable to change by itself the direction of motion |
| D. | Unable to change by itself the state of rest and of uniform linear motion |
| Answer» E. | |
| 6976. |
When a train stops suddenly, passengers in the running train feel an instant jerk in the forward direction because [MP PMT 1982] |
| A. | The back of seat suddenly pushes the passengers forward |
| B. | Inertia of rest stops the train and takes the body forward |
| C. | Upper part of the body continues to be in the state of motion whereas the lower part of the body in contact with seat remains at rest |
| D. | Nothing can be said due to insufficient data |
| Answer» D. Nothing can be said due to insufficient data | |
| 6977. |
In the above Question, if the string C is stretched slowly, then |
| A. | The portion AB of the string will break |
| B. | The portion BC of the string will break |
| C. | None of the strings will break |
| D. | None of the above |
| Answer» B. The portion BC of the string will break | |
| 6978. |
When a bus suddenly takes a turn, the passengers are thrown outwards because of [AFMC 1999; CPMT 2000, 2001] |
| A. | Inertia of motion |
| B. | Acceleration of motion |
| C. | Speed of motion |
| D. | (a) Both (b) and |
| Answer» B. Acceleration of motion | |
| 6979. |
A rider on horse back falls when horse starts running all of a sudden because [MP PMT 1982] |
| A. | Rider is taken back |
| B. | Rider is suddenly afraid of falling |
| C. | Inertia of rest keeps the upper part of body at rest whereas lower part of the body moves forward with the horse |
| D. | None of the above |
| Answer» D. None of the above | |
| 6980. |
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will [MP PMT 1991] |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | The information is incomplete |
| Answer» B. Decrease | |
| 6981. |
The magnetic flux linked with a coil is given by an equation \[\varphi \] (in webers) = \[8{{t}^{2}}+3t+5\]. The induced e.m.f. in the coil at the fourth second will be [MP PET 1990] |
| A. | 16 units |
| B. | 39 units |
| C. | 67 units |
| D. | 145 units |
| Answer» D. 145 units | |
| 6982. |
A coil having an area \[{{A}_{0}}\] is placed in a magnetic field which changes from \[{{B}_{0}}\]to \[4{{B}_{0}}\] in a time interval t. The e.m.f. induced in the coil will be [MP PET 1990] |
| A. | \[\frac{3{{A}_{0}}{{B}_{0}}}{t}\] |
| B. | \[\frac{4{{A}_{0}}{{B}_{0}}}{t}\] |
| C. | \[\frac{3{{B}_{0}}}{{{A}_{0}}t}\] |
| D. | \[\frac{4{{B}_{0}}}{{{A}_{0}}t}\] |
| Answer» B. \[\frac{4{{A}_{0}}{{B}_{0}}}{t}\] | |
| 6983. |
If a coil of 40 turns and area 4.0 cm2 is suddenly removed from a magnetic field, it is observed that a charge of \[2.0\times {{10}^{-4}}C\] flows into the coil. If the resistance of the coil is \[80\Omega \], the magnetic flux density in \[Wb/{{m}^{2}}\] is [MP PET 2005] |
| A. | 0.5 |
| B. | 1.0 |
| C. | 1.5 |
| D. | 2.0 |
| Answer» C. 1.5 | |
| 6984. |
In a magnetic field of 0.05T, area of a coil changes from \[101\,c{{m}^{2}}\] to \[100\,c{{m}^{2}}\] without changing the resistance which is 2W. The amount of charge that flow during this period is [Orissa PMT 2005] |
| A. | \[2.5\times {{10}^{-6}}\]coulomb |
| B. | \[2\times {{10}^{-6}}\]coulomb |
| C. | \[{{10}^{-6}}\]coulomb |
| D. | \[8\times {{10}^{-6}}\]coulomb |
| Answer» B. \[2\times {{10}^{-6}}\]coulomb | |
| 6985. |
The diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed [CPMT 1986] |
| A. | Constant deflection will be observed in the galvanometer for 50 Hz supply |
| B. | Visible small variations will be observed in the galvanometer for 50 Hz input |
| C. | Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of 1 to 2 Hz |
| D. | No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz |
| Answer» D. No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz | |
| 6986. |
An infinitely long cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. The direction of induced current as seen from the z axis will be [IIT-JEE (Screening) 2005] |
| A. | Clockwise of the +ve z axis |
| B. | Anticlockwise of the +ve z axis |
| C. | Zero |
| D. | Along the magnetic field |
| Answer» D. Along the magnetic field | |
| 6987. |
Magnetic flux in a circuit containing a coil of resistance \[2\Omega \]changes from 2.0 Wb to 10 Wb in 0.2 sec. The charge passed through the coil in this time is [DPMT 2003] |
| A. | 0.8 C |
| B. | 1.0 C |
| C. | 5.0 C |
| D. | 4.0 C |
| Answer» E. | |
| 6988. |
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength \[4\times {{10}^{-4}}Wb/{{m}^{2}}\], if rotated through 90o in 0.1 s, the average emf induced in the coil is [Pb. PET 2002] |
| A. | 0.012 V |
| B. | 0.05 V |
| C. | 0.1 V |
| D. | 0.2 V |
| Answer» E. | |
| 6989. |
The magnetic flux linked with coil, in weber is given by the equation, \[\varphi =5{{t}^{2}}+3t+16\]. The induced emf in the coil in the fourth second is [Pb. PMT 2004] |
| A. | 10 V |
| B. | 30 V |
| C. | 45 V |
| D. | 90 V |
| Answer» B. 30 V | |
| 6990. |
If a copper ring is moved quickly towards south pole of a powerful stationary bar magnet, then [Pb. PMT 2004] |
| A. | Current flows through the copper ring |
| B. | Voltage in the magnet increase |
| C. | Current flows in the magnet |
| D. | Copper ring will get magnetised |
| Answer» B. Voltage in the magnet increase | |
| 6991. |
A coil having n turns and resistance R W is connected with a galvanometer of resistance \[4R\Omega \]. This combination is moved in time t seconds from a magnetic field W1 weber to W2 weber. The induced current in the circuit is [AIEEE 2004] |
| A. | \[-\frac{{{W}_{2}}-{{W}_{1}}}{5\ Rnt}\] |
| B. | \[-\frac{n({{W}_{2}}-{{W}_{1}})}{5\ Rt}\] |
| C. | \[-\frac{({{W}_{2}}-{{W}_{1}})}{Rnt}\] |
| D. | \[-\frac{n({{W}_{2}}-{{W}_{1}})}{Rt}\] |
| Answer» C. \[-\frac{({{W}_{2}}-{{W}_{1}})}{Rnt}\] | |
| 6992. |
A metallic ring is attached with the wall of a room. When the north pole of a magnet is brought near to it, the induced current in the ring will be [AFMC 1993; MP PMT/PET 1998; Pb PET 2003] |
| A. | First clockwise then anticlockwise |
| B. | In clockwise direction |
| C. | In anticlockwise direction |
| D. | First anticlockwise then clockwise |
| Answer» D. First anticlockwise then clockwise | |
| 6993. |
A magnet NS is suspended from a spring and while it oscillates, the magnet moves in and out of the coil C. The coil is connected to a galvanometer G. Then as the magnet oscillates, [KCET 2004] |
| A. | G shows deflection to the left and right with constant amplitude |
| B. | G shows deflection on one side |
| C. | G shows no deflection. |
| D. | G shows deflection to the left and right but the amplitude steadily decreases. |
| Answer» E. | |
| 6994. |
The magnetic flux linked with a circuit of resistance 100 ohm increases from 10 to 60 webers. The amount of induced charge that flows in the circuit is (in coulomb) [MP PET 2003] |
| A. | 0.5 |
| B. | 5 |
| C. | 50 |
| D. | 100 |
| Answer» B. 5 | |
| 6995. |
The magnetic flux linked with a vector area \[\overrightarrow{A}\] in a uniform magnetic field \[\overrightarrow{B}\] is [MP PET 2003] |
| A. | \[\overrightarrow{B}\times \overrightarrow{A}\] |
| B. | AB |
| C. | \[\overrightarrow{B}\cdot \overrightarrow{A}\] |
| D. | \[\frac{B}{A}\] |
| Answer» D. \[\frac{B}{A}\] | |
| 6996. |
When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is [BVP 2003] |
| A. | Equal to zero |
| B. | Less than g |
| C. | Equal to g |
| D. | Equal to g in to beginning and then more than g |
| Answer» B. Less than g | |
| 6997. |
A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of \[2\times {{10}^{-5}}\,Wb/{{m}^{2}}\]. The coil is rotated through \[{{180}^{o}}\] in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is [EAMCET 2003] |
| A. | 5 |
| B. | 10 |
| C. | 15 |
| D. | 20 |
| Answer» C. 15 | |
| 6998. |
The magnetic flux linked with a coil at any instant ?t? is given by f = 5t3 ? 100t + 300, the e.m.f. induced in the coil at t = 2 second is [KCET 2003] |
| A. | ? 40 V |
| B. | 40 V |
| C. | 140 V |
| D. | 300 V |
| Answer» C. 140 V | |
| 6999. |
An aluminium ring B faces an electromagnet A. The current I through A can be altered [Kerala PET 2002] |
| A. | Whether I increases or decreases, B will not experience any force |
| B. | If I decrease, A will repel B |
| C. | If I increases, A will attract B |
| D. | If I increases, A will repel B |
| Answer» E. | |
| 7000. |
A magnet is dropped down an infinitely long vertical copper tube [KCET 2002] |
| A. | The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
| B. | The magnet moves with continuously decreasing velocity and ultimately comes to rest |
| C. | The magnet moves with continuously increasing velocity but constant acceleration |
| D. | The magnet moves with continuously increasing velocity and acceleration |
| Answer» B. The magnet moves with continuously decreasing velocity and ultimately comes to rest | |