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.
| 5451. |
Wave is associated with matter |
| A. | When it is stationary |
| B. | When it is in motion with the velocity of light only |
| C. | When it is in motion with any velocity |
| D. | None of the above |
| Answer» D. None of the above | |
| 5452. |
The de-Broglie wavelength is proportional to [RPET 2003] |
| A. | \[\lambda \propto \frac{1}{\nu }\] |
| B. | \[\lambda \propto \frac{1}{m}\] |
| C. | \[\lambda \propto \frac{1}{p}\] |
| D. | \[\lambda \propto p\] |
| Answer» D. \[\lambda \propto p\] | |
| 5453. |
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same [CBSE PMT 1995; DCE 2001; AIIMS 2003] |
| A. | Energy |
| B. | Momentum |
| C. | Velocity |
| D. | Angular momentum |
| Answer» C. Velocity | |
| 5454. |
If particles are moving with same velocity, then maximum de-Broglie wavelength will be for [CBSE PMT 2002] |
| A. | Neutron |
| B. | Proton |
| C. | b-particle |
| D. | \[\alpha \]-particle |
| Answer» D. \[\alpha \]-particle | |
| 5455. |
The de-Broglie wavelength of an electron having \[80eV\] of energy is nearly (1eV = 1.6 ´ 10?19 J, Mass of electron = 9 ´ 10?31kg Plank?s constant = 6.6 ´ 10?34 J-sec) [EAMCET (Engg.) 2001] |
| A. | 140 Å |
| B. | 0.14 Å |
| C. | 14 Å |
| D. | 1.4 Å |
| Answer» E. | |
| 5456. |
The energy that should be added to an electron, to reduce its de-Broglie wavelengths from \[{{10}^{-10}}\]m to \[0.5\times {{10}^{-10}}\]m, will be [KCET (Engg./Med.) 2000] |
| A. | Four times the initial energy |
| B. | Thrice the initial energy |
| C. | Equal to the initial energy |
| D. | Twice the initial energy |
| Answer» C. Equal to the initial energy | |
| 5457. |
de-Broglie hypothesis treated electrons as [BHU 2000] |
| A. | Particles |
| B. | Waves |
| C. | Both ?a? and ?b? |
| D. | None of these |
| Answer» C. Both ?a? and ?b? | |
| 5458. |
What is the de-Broglie wavelength of the \[\alpha -\]particle accelerated through a potential difference V [RPMT 1996] |
| A. | \[\frac{0.287}{\sqrt{V}}\]Å |
| B. | \[\frac{12.27}{\sqrt{V}}\]Å |
| C. | \[\frac{0.101}{\sqrt{V}}\]Å |
| D. | \[\frac{0.202}{\sqrt{V}}\]Å |
| Answer» D. \[\frac{0.202}{\sqrt{V}}\]Å | |
| 5459. |
What will be the ratio of de-Broglie wavelengths of proton and \[\alpha -\]particle of same energy [RPET 1991, 96; DCE 2002; Kerala PET 2005] |
| A. | 2 : 1 |
| B. | 1 : 2 |
| C. | 4 : 1 |
| D. | 1 : 4 |
| Answer» B. 1 : 2 | |
| 5460. |
An electron of mass m when accelerated through a potential difference V has de-Broglie wavelength \[\lambda \]. The de-Broglie wavelength associated with a proton of mass M accelerated through the same potential difference will be [CBSE PMT 1995; EAMCET 2001; J & K CET 2004] |
| A. | \[\lambda \frac{m}{M}\] |
| B. | \[\lambda \sqrt{\frac{m}{M}}\] |
| C. | \[\lambda \frac{M}{m}\] |
| D. | \[\lambda \sqrt{\frac{M}{m}}\] |
| Answer» C. \[\lambda \frac{M}{m}\] | |
| 5461. |
The idea of matter waves was given by |
| A. | Davisson and Germer |
| B. | de-Broglie |
| C. | Einstein |
| D. | Planck |
| Answer» C. Einstein | |
| 5462. |
Temperature above which a ferromagnetic substance becomes paramagnetic is called [SCRA 1994; J & K CET 2004] |
| A. | Critical temperature |
| B. | Boyle's temperature |
| C. | Debye's temperature |
| D. | Curie temperature |
| Answer» E. | |
| 5463. |
The permanent magnet is made from which one of the following substances [Bihar MEE 1995] |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Electromagnetic |
| Answer» D. Electromagnetic | |
| 5464. |
The material of permanent magnet has [KCET 1994, 2003; AFMC 2004] |
| A. | High retentivity, low coercivity |
| B. | Low retentivity, high coercivity |
| C. | Low retentivity, low coercivity |
| D. | High retentivity, high coercivity |
| Answer» E. | |
| 5465. |
If a diamagnetic substance is brought near north or south pole of a bar magnet, it is [EAMCET (Engg.) 1995; CBSE PMT 1999; AFMC 2003] |
| A. | Attracted by the poles |
| B. | Repelled by the pole |
| C. | Repelled by the north pole and attracted by the south pole |
| D. | Attracted by the north pole and repelled by the south pole |
| Answer» C. Repelled by the north pole and attracted by the south pole | |
| 5466. |
When a ferromagnetic material is heated to temperature above its Curie temperature, the material [UPSEAT 2005] |
| A. | Is permanently magnetized |
| B. | Remains ferromagnetic |
| C. | Behaves like a diamagnetic material |
| D. | Behaves like a paramagnetic material |
| Answer» E. | |
| 5467. |
A ferromagnetic material is heated above its curie temperature. Which one is a correct statement [MP PET 1995] |
| A. | Ferromagnetic domains are perfectly arranged |
| B. | Ferromagnetic domains becomes random |
| C. | Ferromagnetic domains are not influenced |
| D. | Ferromagnetic material changes itself into diamagnetic material |
| Answer» C. Ferromagnetic domains are not influenced | |
| 5468. |
Susceptibility of ferromagnetic substance is [Orissa JEE 2005] |
| A. | > 1 |
| B. | < 1 |
| C. | 0 |
| D. | 1 |
| Answer» B. < 1 | |
| 5469. |
Among the following properties describing diamagnetism identify the property that is wrongly stated [KCET 2005] |
| A. | Diamagnetic material do not have permanent magnetic moment |
| B. | Diamagnetism is explained in terms of electromagnetic induction |
| C. | Diamagnetic materials have a small positive susceptibility |
| D. | The magnetic moment of individual electrons neutralize each other |
| Answer» D. The magnetic moment of individual electrons neutralize each other | |
| 5470. |
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material denoted by \[{{\mu }_{d}},\,{{\mu }_{p}},\,{{\mu }_{f}}\]respectively then [CBSE PMT 2005] |
| A. | \[{{\mu }_{d}}\ne \text{ 0 and }{{\mu }_{f}}\ne \text{ 0}\] |
| B. | \[{{\mu }_{p}}=\text{ 0 and }{{\mu }_{f}}\ne \text{ 0}\] |
| C. | \[{{\mu }_{d}}=\text{ 0 and }{{\mu }_{p}}\ne \text{ 0}\] |
| D. | \[{{\mu }_{d}}\ne \text{ 0 and }{{\mu }_{p}}=\text{ 0}\] |
| Answer» D. \[{{\mu }_{d}}\ne \text{ 0 and }{{\mu }_{p}}=\text{ 0}\] | |
| 5471. |
In the hysteresis cycle, the value of H needed to make the intensity of magnetisation zero is called [DCE 2004] |
| A. | Retentivity |
| B. | Coercive force |
| C. | Lorentz force |
| D. | None of the above |
| Answer» C. Lorentz force | |
| 5472. |
If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field of solenoid [DCE 2004] |
| A. | Largely increases |
| B. | Slightly increases |
| C. | Largely decreases |
| D. | Slightly decreases |
| Answer» B. Slightly increases | |
| 5473. |
Which of the following is diamagnetism [DCE 2002] |
| A. | Aluminium |
| B. | Quartz |
| C. | Nickel |
| D. | Bismuth |
| Answer» E. | |
| 5474. |
The magnetic susceptibility of any paramagnetic material changes with absolute temperature T as [UPSEAT 2004; DCE 2005] |
| A. | Directly proportional to T |
| B. | Remains constant |
| C. | Inversely proportional to T |
| D. | Exponentially decaying with T |
| Answer» D. Exponentially decaying with T | |
| 5475. |
When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is [UPSEAT 2004] |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 5476. |
For an isotropic medium B, m, H and M are related as (where \[B,\,\,{{\mu }_{0}},\,\,H\] and M have their usual meaning in the context of magnetic material [Pb. PMT 2004] |
| A. | \[(B-M)={{\mu }_{0}}H\] |
| B. | \[M={{\mu }_{0}}(H+M)\] |
| C. | \[H={{\mu }_{0}}(H+M)\] |
| D. | \[B={{\mu }_{o}}(H+M)\] |
| Answer» E. | |
| 5477. |
The given figure represents a material which is [Orissa PMT 2004] |
| A. | Paramagnetic |
| B. | Diamagnetic |
| C. | Ferromagnetic |
| D. | None of these |
| Answer» C. Ferromagnetic | |
| 5478. |
Demagnetisation of magnets can be done by [DPMT 1984; CBSE PMT 1988] |
| A. | Rough handling |
| B. | Heating |
| C. | Magnetising in the opposite direction |
| D. | All the above |
| Answer» E. | |
| 5479. |
The materials suitable for making electromagnets should have [AIEEE 2004] |
| A. | High retentivity and high coercivity |
| B. | Low retentivity and low coercivity |
| C. | High retentivity and low coercivity |
| D. | Low retentivity and high coercivity |
| Answer» D. Low retentivity and high coercivity | |
| 5480. |
Liquid oxygen remains suspended between two pole faces of a magnet because it is [AIIMS 2004] |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferromagnetic |
| D. | Antiferromagnetic |
| Answer» C. Ferromagnetic | |
| 5481. |
Which one of the following is a non-magnetic substance [MP PET 2004] |
| A. | Iron |
| B. | Nickel |
| C. | Cobalt |
| D. | Brass |
| Answer» E. | |
| 5482. |
A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as [AIIMS 2003] |
| A. | Paramagnetic |
| B. | Diamagnetic |
| C. | Ferromagnetic |
| D. | Antiferromagnetic |
| Answer» C. Ferromagnetic | |
| 5483. |
Curie temperature is the temperature above which [DCE 2002; AIEEE 2003] |
| A. | A paramagnetic material becomes ferromagnetic |
| B. | A ferromagnetic material becomes paramagnetic |
| C. | A paramagnetic material becomes diamagnetic |
| D. | A ferromagnetic material becomes diamagnetic |
| Answer» C. A paramagnetic material becomes diamagnetic | |
| 5484. |
A diamagnetic material in a magnetic field moves [Pb. PMT 1999; AIIMS 2000; MH CET 2000; CBSE PMT 2003] |
| A. | From weaker to the stronger parts of the field |
| B. | Perpendicular to the field |
| C. | From stronger to the weaker parts of the field |
| D. | In none of the above directions |
| Answer» D. In none of the above directions | |
| 5485. |
A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is [Kerala 2002] |
| A. | Diamagnetic |
| B. | Paramagnetic |
| C. | Ferri-magnetic |
| D. | Antiferro-magnetic |
| Answer» B. Paramagnetic | |
| 5486. |
A superconductor exhibits perfect [KCET 2002] |
| A. | Ferrimagnetism |
| B. | Ferromagnetism |
| C. | Paramagnetism |
| D. | Diamagnetism |
| Answer» E. | |
| 5487. |
Curies law can be written as [MH CET 2002; CBSE PMT 2003] |
| A. | \[\chi \propto (T-{{T}_{c}})\] |
| B. | \[\chi \propto \frac{1}{T-{{T}_{c}}}\] |
| C. | \[\chi \propto \frac{1}{T}\] |
| D. | \[\chi \propto T\] |
| Answer» D. \[\chi \propto T\] | |
| 5488. |
Which of the following statements is incorrect about hysteresis [UPSEAT 2002] |
| A. | This effect is common to all ferromagnetic substances |
| B. | The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material |
| C. | The hysteresis loop area is independent of the thermal energy developed per unit volume of the material |
| D. | The shape of the hysteresis loop is characteristic of the material |
| Answer» D. The shape of the hysteresis loop is characteristic of the material | |
| 5489. |
Which of the following is most suitable for the core of electromagnets [AIIMS 1980; NCERT 1980; AFMC 1988; CBSE PMT 1990] |
| A. | Soft iron |
| B. | Steel |
| C. | Copper-nickel alloy |
| D. | Air |
| Answer» B. Steel | |
| 5490. |
The universal property of all substances is [CPMT 2002] |
| A. | Diamagnetism |
| B. | Ferromagnetism |
| C. | Paramagnetism |
| D. | All of these |
| Answer» B. Ferromagnetism | |
| 5491. |
The magnetic susceptibility is negative for [AIEEE 2002] |
| A. | Paramagnetic materials |
| B. | Diamagnetic materials |
| C. | Ferromagnetic materials |
| D. | Paramagnetic and ferromagnetic materials |
| Answer» C. Ferromagnetic materials | |
| 5492. |
If the angular momentum of an electron is \[\overrightarrow{J\,}\] then the magnitude of the magnetic moment will be [MP PET 2002] |
| A. | \[\frac{eJ}{m}\] |
| B. | \[\frac{eJ}{2m}\] |
| C. | eJ 2m |
| D. | \[\frac{2m}{eJ}\] |
| Answer» C. eJ 2m | |
| 5493. |
If a magnetic substance is kept in a magnetic field, then which of the following is thrown out [DCE 1999, 2001] |
| A. | Paramagnetic |
| B. | Ferromagnetic |
| C. | Diamagnetic |
| D. | Antiferromagnetic |
| Answer» D. Antiferromagnetic | |
| 5494. |
The magnetic susceptibility does not depend upon the temperature in [CBSE PMT 2001] |
| A. | Ferrite substances |
| B. | Ferromagnetic substances |
| C. | Diamagnetic substances |
| D. | Paramagnetic substances |
| Answer» D. Paramagnetic substances | |
| 5495. |
Identify the paramagnetic substance [KCET 2001] |
| A. | Iron |
| B. | Aluminium |
| C. | Nickel |
| D. | Hydrogen |
| Answer» C. Nickel | |
| 5496. |
Which of the following is true [BHU 2001] |
| A. | Diamagnetism is temperature dependent |
| B. | Paramagnetism is temperature dependent |
| C. | Paramagnetism is temperature independent |
| D. | None of these |
| Answer» C. Paramagnetism is temperature independent | |
| 5497. |
The relative permeability is represented by mr and the susceptibility is denoted by c for a magnetic substance. Then for a paramagnetic substance [KCET (Engg./Med.) 2001] |
| A. | mr < 1, c < 0 |
| B. | mr < 1, c > 0 |
| C. | mr > 1, c < 0 |
| D. | mr > 1, c > 0 |
| Answer» E. | |
| 5498. |
If a diamagnetic solution is poured into a U-tube and one arm of this U-tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will [AMU 1999, 2000] |
| A. | Rise |
| B. | Fall |
| C. | Oscillate slowly |
| D. | Remain as such |
| Answer» C. Oscillate slowly | |
| 5499. |
Magnetic permeability is maximum for [AIIMS 2000; MH CET 2003; DPMT 2003] |
| A. | Diamagnetic substance |
| B. | Paramagnetic substance |
| C. | Ferromagnetic substance |
| D. | All of these |
| Answer» D. All of these | |
| 5500. |
The magnetic moment of atomic neon is [NCERT 1984] |
| A. | Zero |
| B. | \[\mu B/2\] |
| C. | \[\mu B\] |
| D. | \[3\mu B/2\] |
| Answer» B. \[\mu B/2\] | |