MCQOPTIONS
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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.
| 5501. |
The use of study of hysteresis curve for a given material is to estimate the [KCET (Engg./Med.) 2000] |
| A. | Voltage loss |
| B. | Hysteresis loss |
| C. | Current loss |
| D. | All of these |
| Answer» C. Current loss | |
| 5502. |
An example of a diamagnetic substance is [KCET 2000] |
| A. | Aluminium |
| B. | Copper |
| C. | Iron |
| D. | Nickel |
| Answer» C. Iron | |
| 5503. |
Which of the following statements are true about the magnetic susceptibility \[{{\chi }_{m}}\] of paramagnetic substance [Roorkee 1999] |
| A. | Value of \[{{\chi }_{m}}\] is inversely proportional to the absolute temperature of the sample |
| B. | cm is positive at all temperature |
| C. | \[{{\chi }_{m}}\] is negative at all temperature |
| D. | \[{{\chi }_{m}}\] does not depend on the temperature of the sample |
| Answer» C. \[{{\chi }_{m}}\] is negative at all temperature | |
| 5504. |
Relative permeability of iron is 5500, then its magnetic susceptibility will be [KCET 2000; Kerala PMT 2004] |
| A. | 5500 ´ 107 |
| B. | 5500 ´ 10?7 |
| C. | 5501 |
| D. | 5499 |
| Answer» E. | |
| 5505. |
The magnetic susceptibility is [RPMT 1999] |
| A. | \[\chi =\frac{I}{H}\] |
| B. | \[\chi =\frac{B}{H}\] |
| C. | \[\chi =\frac{M}{V}\] |
| D. | \[\chi =\frac{M}{H}\] |
| Answer» B. \[\chi =\frac{B}{H}\] | |
| 5506. |
Diamagnetic substances are [AFMC 1999] |
| A. | Feebly attracted by magnets |
| B. | Strongly attracted by magnets |
| C. | Feebly repelled by magnets |
| D. | Strongly repelled by magnets |
| Answer» D. Strongly repelled by magnets | |
| 5507. |
Substances in which the magnetic moment of a single atom is not zero, is known as [AFMC 1999] |
| A. | Diamagnetism |
| B. | Ferromagnetism |
| C. | Paramagnetism |
| D. | Ferrimagnetism |
| Answer» D. Ferrimagnetism | |
| 5508. |
The only property possessed by ferromagnetic substance is [KCET 1999] |
| A. | Hysteresis |
| B. | Susceptibility |
| C. | Directional property |
| D. | Attracting magnetic substances |
| Answer» B. Susceptibility | |
| 5509. |
When a magnetic substance is heated, then it [AIIMS 1999] |
| A. | Becomes a strong magnet |
| B. | Losses its magnetism |
| C. | Does not effect the magnetism |
| D. | Either (a) or (c) |
| Answer» C. Does not effect the magnetism | |
| 5510. |
Magnets cannot be made from which of the following substances [Bihar PET 1984] |
| A. | Iron |
| B. | Nickel |
| C. | Copper |
| D. | All of the above |
| Answer» D. All of the above | |
| 5511. |
Keeping dissimilar poles of two magnets of equal pole strength and length same side, their time period will be [DPMT 2001] |
| A. | Zero |
| B. | One second |
| C. | Infinity |
| D. | Any value |
| Answer» D. Any value | |
| 5512. |
Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular to its axis as shown then time period for each part will be |
| A. | \[4T\] |
| B. | \[T/4\] |
| C. | \[T/2\] |
| D. | \[T\] |
| Answer» D. \[T\] | |
| 5513. |
The radius of the coil of a Tangent galvanometer. which has 10 turns is 0.1m. The current required to produce a deflection of 60° \[({{B}_{H}}=4\times {{10}^{-5}}T)\] is [MP PET 2005] |
| A. | 3 A |
| B. | 1.1 A |
| C. | 2.1 A |
| D. | 1.5 A |
| Answer» C. 2.1 A | |
| 5514. |
Two identical bar magnets are placed on above the other such that they are mutually perpendicular and bisect each other. The time period of this combination in a horizontal magnetic field is T. The time period of each magnet in the same field is [CPMT 2005] |
| A. | \[\sqrt{2}\,T\] |
| B. | \[{{2}^{\frac{1}{4}}}T\] |
| C. | \[{{2}^{-\frac{1}{4}}}T\] |
| D. | \[{{2}^{-\frac{1}{2}}}T\] |
| Answer» D. \[{{2}^{-\frac{1}{2}}}T\] | |
| 5515. |
A magnet oscillating in a horizontal plane has a time period of 2 second at a place where the angle of dip is 30o and 3 seconds at another place where the angle of dip is 60o. The ratio of resultant magnetic fields at the two places is [Pb. PET 2001] |
| A. | \[\frac{4\sqrt{3}}{7}\] |
| B. | \[\frac{4}{9\sqrt{3}}\] |
| C. | \[\frac{9}{4\sqrt{3}}\] |
| D. | \[\frac{9}{\sqrt{3}}\] |
| Answer» D. \[\frac{9}{\sqrt{3}}\] | |
| 5516. |
The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is 2 s. The magnet is cut along its length into three equal parts and three parts are then placed on each other with their like poles together. The time period of this combination will be [AIEEE 2004] |
| A. | 2 s |
| B. | 2/3 s |
| C. | \[2\sqrt{3}\,s\] |
| D. | \[2/\sqrt{3}\,s\] |
| Answer» C. \[2\sqrt{3}\,s\] | |
| 5517. |
Two magnets of same size and mass make respectively 10 and 15 oscillations per minute at certain place. The ratio of their magnetic moments is [Bihar PET 1984; MP PET/PMT 1988; MP PET 1992] |
| A. | 4 : 9 |
| B. | 9 : 4 |
| C. | 2 : 3 |
| D. | 3 : 2 |
| Answer» B. 9 : 4 | |
| 5518. |
A bar magnet is oscillating in the earth's magnetic field with time period T. If its mass is increased four times then its time period will be [J & K CET 2004] |
| A. | 4 T |
| B. | 2 T |
| C. | T |
| D. | T/2 |
| Answer» C. T | |
| 5519. |
A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T ¢, then ratio \[\frac{{{T}'}}{T}\]is [AIEEE 2003] |
| A. | \[\frac{1}{4}\] |
| B. | \[\frac{1}{2\sqrt{2}}\] |
| C. | \[\frac{1}{2}\] |
| D. | 2 |
| Answer» D. 2 | |
| 5520. |
In a tangent galvanometer a current of 0.1 A produces a deflection of 30o. The current required to produce a deflection of 60o is [MP PET 2003] |
| A. | 0.2 A |
| B. | 0.3 A |
| C. | 0.4 A |
| D. | 0.5 A |
| Answer» C. 0.4 A | |
| 5521. |
A bar magnet is oscillating in the Earth?s magnetic field with a period T. What happens to its period and motion if its mass is quadrupled [CBSE PMT 2003] |
| A. | Motion remains S.H.M. with time period = 2T |
| B. | Motion remains S.H.M. with time period = 4T |
| C. | Motion remains S.H.M. and period remains nearly constant |
| D. | Motion remains S.H.M. with time period \[=\frac{T}{2}\] |
| Answer» B. Motion remains S.H.M. with time period = 4T | |
| 5522. |
The magnetic needle of a tangent galvanometer is deflected at an angle 30o due to a magnet. The horizontal component of earth?s magnetic field 0.34 ´ 10?4 T is along the plane of the coil. The magnetic intensity is [AIIMS 2000, 2002; BHU 2000; AFMC 2000; KCET (Engg./Med.) 1999] |
| A. | 1.96 ´ 10?4 T |
| B. | 1.96 ´ 10?5 T |
| C. | 1.96 ´ 104 T |
| D. | 1.96 ´ 105 T |
| Answer» C. 1.96 ´ 104 T | |
| 5523. |
When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is [JIPMER 2002] |
| A. | 3 : 1 |
| B. | 3 : 2 |
| C. | \[\sqrt{3}:1\] |
| D. | \[2\sqrt{3}:1\] |
| Answer» E. | |
| 5524. |
The period of oscillations of a magnet is 2 sec. When it is remagnetised so that the pole strength is 4 times its period will be [Kerala PMT 2002] |
| A. | 4 sec |
| B. | 2 sec |
| C. | 1 sec |
| D. | 1/2 sec |
| Answer» D. 1/2 sec | |
| 5525. |
Which of the following statement is not the true [KCET (Engg./Med.) 2001] |
| A. | While taking reading of tangent galvanometer, the plane of the coil must be set at right angles to the earth?s magnetic meridian |
| B. | A short magnet is used in a tangent galvanometer since a long magnet would be heavy and may not easily move |
| C. | Measurements with the tangent galvanometer will be more accurate when the deflection is around 45o |
| D. | A tangent galvanometer cannot be used in the polar region |
| Answer» B. A short magnet is used in a tangent galvanometer since a long magnet would be heavy and may not easily move | |
| 5526. |
When 2 amperes current is passed through a tangent galvanometer, it gives a deflection of 30o. For 60o deflection, the current must be [MP PMT 2001] |
| A. | 1 amp |
| B. | \[2\sqrt{3}\,amp\] |
| C. | 4 amp |
| D. | 6 amp |
| Answer» E. | |
| 5527. |
A magnet freely suspended in a vibration magnetometer makes 10 oscillations per minute at a place A and 20 oscillations per minute at a place B. If the horizontal component of earth?s magnetic field at A is \[36\times {{10}^{-6}}T,\] then its value at B is [EAMCET (Med.) 2001] |
| A. | 36 ´ 10?6 T |
| B. | 72 ´ 10?6 T |
| C. | 144 ´ 10?6 T |
| D. | 288 ´ 10?6 T |
| Answer» D. 288 ´ 10?6 T | |
| 5528. |
The time period of a thin bar magnet in earth?s magnetic field is T. If the magnet is cut into two equal parts perpendicular to its length, the time period of each part in the same field will be [MP PET 2001] |
| A. | \[\frac{T}{2}\] |
| B. | T |
| C. | \[\sqrt{2}\,T\] |
| D. | 2T |
| Answer» B. T | |
| 5529. |
Before using the tangent galvanometer, its coil is set in [MP PMT 2001; CPMT 2005] |
| A. | Magnetic meridian (or vertically north south) |
| B. | Perpendicular to magnetic meridian |
| C. | At angle of 45o to magnetic meridian |
| D. | It does not require any setting |
| Answer» B. Perpendicular to magnetic meridian | |
| 5530. |
The error in measuring the current with a tangent galvanometer is minimum when the deflection is about [MP PET 2001] |
| A. | 0o |
| B. | 30o |
| C. | 45o |
| D. | 60o |
| Answer» D. 60o | |
| 5531. |
The time period of a vibration magnetometer is T0. Its magnet is replaced by another magnet whose moment of inertia is 3 times and magnetic moment is 1/3 of the initial magnet. The time period now will be [MP PMT 2000] |
| A. | 3T0 |
| B. | T0 |
| C. | \[{{T}_{0}}/\sqrt{3}\] |
| D. | T0/3 |
| Answer» B. T0 | |
| 5532. |
A tangent galvanometer has a coil of 25 turns and radius of 15 cm. The horizontal component of the earth?s magnetic field is 3 ´ 10?5 T. The current required to produce a deflection of 45o in it, is [MP PMT 2000] |
| A. | 0.29 A |
| B. | 1.2 A |
| C. | 3.6 ´ 10?5 A |
| D. | 0.14 A |
| Answer» B. 1.2 A | |
| 5533. |
A magnet makes 40 oscillations per minute at a place having magnetic field intensity of 0.1 ´ 10?5 T. At another place, it takes 2.5 sec to complete one vibration. The value of earth?s horizontal field at that place is [AIIMS 2000; CPMT 2000; Pb PET 2002] |
| A. | 0.25 ´ 10?6 T |
| B. | 0.36 ´ 10?6 T |
| C. | 0.66 ´ 10?8 T |
| D. | 1.2 ´ 10?6 T |
| Answer» C. 0.66 ´ 10?8 T | |
| 5534. |
The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by 19%. By doing this the periodic time of the magnetometer will [MP PMT 2000, 01] |
| A. | Increase by 19% |
| B. | Decrease by 19% |
| C. | Increase by 11% |
| D. | Decrease by 21% |
| Answer» D. Decrease by 21% | |
| 5535. |
Two short magnets having magnetic moments in the ratio 27 : 8, when placed on opposite sides of a deflection magnetometer, produce no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is [EAMCET (Med.) 2000] |
| A. | 0.06 m |
| B. | 0.08 m |
| C. | 0.12 m |
| D. | 0.18 m |
| Answer» E. | |
| 5536. |
The time period of oscillation of a bar magnet suspended horizontally along the magnetic meridian is T0. If this magnet is replaced by another magnet of the same size and pole strength but with double the mass, the new time period will be [SCRA 1994; JIPMER 2001, 02] |
| A. | \[\frac{{{T}_{0}}}{2}\] |
| B. | \[\frac{{{T}_{0}}}{\sqrt{2}}\] |
| C. | \[\sqrt{2}{{T}_{0}}\] |
| D. | \[2{{T}_{0}}\] |
| Answer» D. \[2{{T}_{0}}\] | |
| 5537. |
At a certain place a magnet makes 30 oscillations per minute. At another place where the magnetic field is double, its time period will be [MP PMT 1989; MP PET/PMT 1988] |
| A. | 4 sec |
| B. | 2 sec |
| C. | \[\frac{1}{2}\sec \] |
| D. | \[\sqrt{2}\sec \] |
| Answer» E. | |
| 5538. |
The period of oscillation of a vibration magnetometer depends on which of the following factors [KCET 1994] |
| A. | I and M only |
| B. | M and H only |
| C. | I and H only |
| D. | I, M and H only where I is the moment of inertia of the magnet about the axis of suspension, M is the magnetic moment of the magnet and H is the external magnetic field |
| Answer» E. | |
| 5539. |
The bob of a simple pendulum is replaced by a magnet. The oscillations are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is short-circuited. Then which one of the following happens [KCET 1994] |
| A. | Period decreases |
| B. | Period does not change |
| C. | Oscillations are damped |
| D. | Amplitude increases |
| Answer» D. Amplitude increases | |
| 5540. |
The time period of a freely suspended magnet is 2 sec. If it is broken in length into two equal parts and one part is suspended in the same way, then its time period will be [MP PMT 1999] |
| A. | 4 sec |
| B. | 2 sec |
| C. | \[\sqrt{2}\sec \] |
| D. | 1 sec |
| Answer» E. | |
| 5541. |
The period of oscillations of a magnetic needle in a magnetic field is 1.0 sec. If the length of the needle is halved by cutting it, the time period will be [MP PMT/PET 1998] |
| A. | 1.0 sec |
| B. | 0.5 sec |
| C. | 0.25 sec |
| D. | 2.0 sec |
| Answer» C. 0.25 sec | |
| 5542. |
When \[\sqrt{3}\]ampere current is passed in a tangent galvanometer, there is a deflection of 30° in it. The deflection obtained when 3 amperes current is passed, is [MP PMT 1997] |
| A. | 30° |
| B. | 45° |
| C. | 60° |
| D. | 75° |
| Answer» C. 60° | |
| 5543. |
To measure which of the following, is a tangent galvanometer used [MP PET 1997; CBSE PMT 2001] |
| A. | Charge |
| B. | Angle |
| C. | Current |
| D. | Magnetic intensity |
| Answer» D. Magnetic intensity | |
| 5544. |
Two magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field with like poles together, 12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed. The ratio of their magnetic moments is [MP PMT 1996; CPMT 2002] |
| A. | 3 : 1 |
| B. | 1 : 3 |
| C. | 3 : 5 |
| D. | 5 : 4 |
| Answer» E. | |
| 5545. |
A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength \[\sqrt{3}\,T\] is applied to the needle in a perpendicular direction, the needle deflects through an angle q, where q is [KCET 1999] |
| A. | 30o |
| B. | 45o |
| C. | 90o |
| D. | 60o |
| Answer» E. | |
| 5546. |
Two normal uniform magnetic field contain a magnetic needle making an angle 60° with F. Then the ratio of \[\frac{F}{H}\] is [CPMT 1987; DPMT 2001] |
| A. | 1 : 2 |
| B. | 2 : 1 |
| C. | \[\sqrt{3}:1\] |
| D. | \[1:\sqrt{3}\] |
| Answer» E. | |
| 5547. |
A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45°. If the current be reduced by a factor of \[\sqrt{3}\], the deflection would [MP PMT 1996; DPMT 2005] |
| A. | Decrease by 30° |
| B. | Decrease by 15° |
| C. | Increase by 15° |
| D. | Increase by 30° |
| Answer» C. Increase by 15° | |
| 5548. |
The strength of the magnetic field in which the magnet of a vibration magnetometer is oscillating is increased 4 times its original value. The frequency of oscillation would then become [Haryana CEE 1996] |
| A. | Twice its original value |
| B. | Four times its original value |
| C. | Half its original value |
| D. | One-fourth its original value |
| Answer» B. Four times its original value | |
| 5549. |
Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true [MP PMT 1995] |
| A. | Q is of non-magnetic material |
| B. | Q is a bar magnet identical to P, and its north pole placed on top of P's north pole |
| C. | Q is of unmagnetized ferromagnetic material |
| D. | Nothing can be said about Q's properties |
| Answer» C. Q is of unmagnetized ferromagnetic material | |
| 5550. |
In sum and difference method in vibration magnetometer, the time period is more if [MP PMT 1989; MP PET/PMT 1988] |
| A. | Similar poles of both magnets are on same sides |
| B. | Opposite poles of both magnets are on same sides |
| C. | Both magnets are perpendicular to each other |
| D. | Nothing can be said |
| Answer» C. Both magnets are perpendicular to each other | |