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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.
| 9501. |
Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is [DCE 2004] |
| A. | F / 8 |
| B. | F / 4 |
| C. | 4 F |
| D. | F / 16 |
| Answer» E. | |
| 9502. |
Compressed air in the tube of a wheel of a cycle at normal temperature suddenly starts coming out from a puncture. The air inside [NCERT 1970] |
| A. | Starts becoming hotter |
| B. | Remains at the same temperature |
| C. | Starts becoming cooler |
| D. | May become hotter or cooler depending upon the amount of water vapour present |
| Answer» D. May become hotter or cooler depending upon the amount of water vapour present | |
| 9503. |
A \[12pF\] capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor [AFMC 2000] |
| A. | \[1.5\times {{10}^{-8}}\,J\] |
| B. | \[2.5\times {{10}^{-7}}\,J\] |
| C. | \[3.5\times {{10}^{-5}}\,J\] |
| D. | \[4.5\times {{10}^{-2}}\,J\] |
| Answer» B. \[2.5\times {{10}^{-7}}\,J\] | |
| 9504. |
A body moving with velocity v has momentum and kinetic energy numerically equal. What is the value of v [Pb. PMT 2002; J&K CET 2004] |
| A. | 2m/s |
| B. | \[\sqrt{2}m/s\] |
| C. | 1m/s |
| D. | \[0.2\ m/s\] |
| Answer» B. \[\sqrt{2}m/s\] | |
| 9505. |
Assertion : When the force retards the motion of a body, the work done is zero. Reason : Work done depends on angle between force and displacement. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 9506. |
In the following transitions, which one has higher frequency [UPSEAT 2001] |
| A. | 3 ? 2 |
| B. | 4 ? 3 |
| C. | 4 ? 2 |
| D. | 3 ? 1 |
| Answer» E. | |
| 9507. |
A current of 2 amp. flows in a long, straight wire of radius 2 mm. The intensity of magnetic field on the axis of the wire is [MP PET 2001] |
| A. | \[\left( \frac{{{\mu }_{o}}}{\pi } \right)\times {{10}^{3}}\]Tesla |
| B. | \[\left( \frac{{{\mu }_{o}}}{2\pi } \right)\times {{10}^{3}}\]Tesla |
| C. | \[\left( \frac{2{{\mu }_{o}}}{\pi } \right)\times {{10}^{3}}\]Tesla |
| D. | Zero |
| Answer» E. | |
| 9508. |
Two bodies A and B having masses in the ratio of 3 : 1 possess the same kinetic energy. The ratio of their linear momenta is then [Haryana CEE 1996] |
| A. | 3 : 1 |
| B. | 9 : 1 |
| C. | 1 : 1 |
| D. | \[\sqrt{3}:1\] |
| Answer» E. | |
| 9509. |
The inductive reactance of an inductor of \[\frac{1}{\pi }\] henry at 50 Hz frequency is [MP PET 2001, 02] |
| A. | \[\frac{50}{\pi }\]ohm |
| B. | \[\frac{\pi }{50}\] ohm |
| C. | 100 ohm |
| D. | 50 ohm |
| Answer» D. 50 ohm | |
| 9510. |
The mass of two substances are 4gm and \[9gm\] respectively. If their kinetic energies are same, then the ratio of their momenta will be [CPMT 2001] |
| A. | 4 : 9 |
| B. | 9 : 4 |
| C. | 3 : 2 |
| D. | 2 : 3 |
| Answer» E. | |
| 9511. |
The coefficient of induction of a choke coil is 0.1H and resistance is \[12\,\Omega \]. If it is connected to an alternating current source of frequency 60 Hz, then power factor will be [RPET 1997] |
| A. | 0.32 |
| B. | 0.30 |
| C. | 0.28 |
| D. | 0.24 |
| Answer» C. 0.28 | |
| 9512. |
The kinetic energy of a body of mass 2 kg and momentum of 2 Ns is [AFMC 1998; DPMT 2000] |
| A. | 1 J |
| B. | 2 J |
| C. | 3 J |
| D. | 4 J |
| Answer» B. 2 J | |
| 9513. |
A ball of mass 150g starts moving with an acceleration of \[20m/{{s}^{2}}\]. When hit by a force, which acts on it for 0.1 sec. The impulsive force is [AFMC 1999; Pb. PMT 2003] |
| A. | 0.5 N-s |
| B. | 0.1 N-s |
| C. | 0.3 N-s |
| D. | 1.2 N-s |
| Answer» D. 1.2 N-s | |
| 9514. |
Assertion : Conductors having equal positive charge and volume, must also have same potential. Reason : Potential depends only on charge and volume of conductor. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» E. If assertion is false but reason is true. | |
| 9515. |
The depth at which the effective value of acceleration due to gravity is \[\frac{g}{4}\] is [MP PET 2003] |
| A. | R |
| B. | \[\frac{3R}{4}\] |
| C. | \[11.2\times {{10}^{2}}\,km{{s}^{-1}}\] |
| D. | \[\frac{R}{4}\] |
| Answer» C. \[11.2\times {{10}^{2}}\,km{{s}^{-1}}\] | |
| 9516. |
Two metallic spheres of radii \[1\,cm\] and \[2\,cm\] are given charges \[{{10}^{-2}}\,C\] and \[5\times {{10}^{-2}}C\] respectively. If they are connected by a conducting wire, the final charge on the smaller sphere is [CBSE PMT 1995] |
| A. | \[3\times {{10}^{-2}}C\] |
| B. | \[1\times {{10}^{-2}}C\] |
| C. | \[4\times {{10}^{-2}}C\] |
| D. | \[2\times {{10}^{-2}}C\] |
| Answer» E. | |
| 9517. |
Assertion : Two persons on the surface of moon cannot talk to each other. Reason : There is no atmosphere on moon. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 9518. |
Two equal forces (P each) act at a point inclined to each other at an angle of 120°. The magnitude of their resultant is [Karnataka CET 2004] |
| A. | \[P/2\] |
| B. | \[P/4\] |
| C. | \[P\] |
| D. | 2P |
| Answer» D. 2P | |
| 9519. |
Assertion : The speedometer of an automobile measure the average speed of the automobile. Reason : Average velocity is equal to total displacement per total time taken. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 9520. |
Force acting upon a charged particle kept between the plates of a charged condenser is \[F\]. If one plate of the condenser is removed, then the force acting on the same particle will become [MP PMT 1991] |
| A. | 0 |
| B. | . \[F/2\] |
| C. | \[F\] |
| D. | \[2F\] |
| Answer» C. \[F\] | |
| 9521. |
The capacitance of a parallel plate capacitor is \[12\,\mu \,F\]. If the distance between the plates is doubled and area is halved, then new capacitance will be [MH CET 2002] |
| A. | \[8\,\mu \,F\] |
| B. | \[6\,\mu \,F\] |
| C. | \[4\,\mu \,F\] |
| D. | \[3\,\mu \,F\] |
| Answer» E. | |
| 9522. |
A toroid has number of turns per unit length n, current i, then the magnetic field is [RPET 2000] |
| A. | \[{{\mu }_{0}}ni\] |
| B. | \[{{\mu }_{0}}{{n}^{2}}i\] |
| C. | \[{{\mu }_{0}}i/n\] |
| D. | None of these |
| Answer» B. \[{{\mu }_{0}}{{n}^{2}}i\] | |
| 9523. |
Which of the following has maximum specific heat [RPMT 1999] |
| A. | Water |
| B. | Alcohol |
| C. | Glycerine |
| D. | Oil |
| Answer» B. Alcohol | |
| 9524. |
Assertion : The melting point of ice decreases with increase of pressure. Reason : Ice contracts on melting. [AIIMS 2004] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 9525. |
The magnetic moment \[(\mu )\]of a revolving electron around the nucleus varies with principal quantum number n as [AIIMS 2005] |
| A. | \[\mu \propto n\] |
| B. | \[\mu \propto 1/n\] |
| C. | \[\mu \propto {{n}^{2}}\] |
| D. | \[\mu \propto 1/{{n}^{2}}\] |
| Answer» B. \[\mu \propto 1/n\] | |
| 9526. |
In an electrolysis experiment, a current i passes through two different cells in series, one containing a solution of \[CuS{{O}_{4}}\] and the other a solution of\[AgN{{O}_{3}}\]. The rate of increase of the weight of the cathodes in the two cells will be [NCERT 1972] |
| A. | In the ratio of the densities of Cu and Ag |
| B. | In the ratio of the at weights of Cu and Ag |
| C. | In the ratio of half the atomic weight of Cu to the atomic weight of Ag |
| D. | In the ratio of half the atomic weight of Cu to half the atomic weight of Ag |
| Answer» D. In the ratio of half the atomic weight of Cu to half the atomic weight of Ag | |
| 9527. |
Assertion : To empty an oil tank, two holes are made. Reason : Oil will come out two holes so it will emptied faster. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 9528. |
A body moves due East with velocity 20 km/hour and then due North with velocity 15 km/hour. The resultant velocity [AFMC 1995] |
| A. | 5 km/hour |
| B. | 15 km/hour |
| C. | 20 km/hour |
| D. | 25 km/hour |
| Answer» E. | |
| 9529. |
Audio signal cannot be transmitted because [Kerala PMT 2005] |
| A. | The signal has more noise |
| B. | The signal cannot be amplified for distance communication |
| C. | The transmitting antenna length is very small to design |
| D. | The transmitting antenna length is very large and impracticable |
| E. | (e) The signal is not a radio signal |
| Answer» F. | |
| 9530. |
An electron (charge =\[1.6\times {{10}^{-19}}C\]) is accelerated through a potential of 100,000 V. The energy acquired by the electron is [MP PET 1989] |
| A. | \[1.6\times {{10}^{-24}}\ J\] |
| B. | \[1.6\times {{10}^{-14}}\ erg\] |
| C. | \[0.53\times {{10}^{-17}}J\] |
| D. | \[1.6\times {{10}^{-14}}J\] |
| Answer» E. | |
| 9531. |
The distance between the plates of a parallel plate condenser is \[8mm\] and P.D. \[120\ volts\]. If a \[6mm\] thick slab of dielectric constant 6 is introduced between its plates, then |
| A. | The charge on the condenser will be doubled |
| B. | The charge on the condenser will be reduced to half |
| C. | The P.D. across the condenser will be \[320\ volts\] |
| D. | The P.D. across the condenser will be \[45\ volts\] |
| Answer» E. | |
| 9532. |
Assertion : Tiny drops of liquid resist deforming forces better than bigger drops. Reason : Excess pressure inside a drop is directly proportional to surface tension. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» C. If assertion is true but reason is false. | |
| 9533. |
Which of the following phenomena suggests the presence of electron energy levels in atoms [JIPMER 1999] |
| A. | Radioactive decay |
| B. | Isotopes |
| C. | Spectral lines |
| D. | a-particles scattering |
| Answer» D. a-particles scattering | |
| 9534. |
Two identical rods of copper and iron are coated with wax uniformly. When one end of each is kept at temperature of boiling water, the length upto which wax melts are \[8.4cm\] and \[4.2cm\] respectively. If thermal conductivity of copper is 0.92, then thermal conductivity of iron is [MP PET 1995] |
| A. | 0.23 |
| B. | 0.46 |
| C. | 0.115 |
| D. | 0.69 |
| Answer» B. 0.46 | |
| 9535. |
Assertion : It is not possible to use \[^{35}Cl\]as the fuel for fusion energy. Reason : The binding energy of \[^{35}Cl\]is too small. [AIIMS 2005] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» D. If the assertion and reason both are false. | |
| 9536. |
Four particles given, have same momentum which has maximum kinetic energy [Orissa PMT 2004] |
| A. | Proton |
| B. | Electron |
| C. | Deutron |
| D. | \[\alpha \]-particles |
| Answer» C. Deutron | |
| 9537. |
Which of the following statements is true [Manipal MEE 1995] |
| A. | g is less at the earth's surface than at a height above it or a depth below it |
| B. | g is same at all places on the surface of the earth |
| C. | g has its maximum value at the equator |
| D. | g is greater at the poles than at the equator |
| Answer» E. | |
| 9538. |
A cathode emits \[1.8\times {{10}^{14}}\] electrons per second, when heated. When 400V is applied to anode all the emitted electrons reach the anode. The charge on electron is \[1.6\times {{10}^{-19}}C\]. The maximum anode current is [MP PMT 2004] |
| A. | \[2.7\mu A\] |
| B. | \[29\mu A\] |
| C. | \[72\mu A\] |
| D. | 29 mA |
| Answer» C. \[72\mu A\] | |
| 9539. |
A force \[F\] acts between sodium and chlorine ions of salt (sodium chloride) when put \[1\,cm\] apart in air. The permittivity of air and dielectric constant of water are \[{{\varepsilon }_{0}}\] and \[K\] respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions \[1\,cm\] apart is [MP PET 1995] |
| A. | \[\frac{F}{K}\] |
| B. | \[\frac{FK}{{{\varepsilon }_{0}}}\] |
| C. | \[\frac{F}{K{{\varepsilon }_{0}}}\] |
| D. | \[\frac{F{{\varepsilon }_{0}}}{K}\] |
| Answer» B. \[\frac{FK}{{{\varepsilon }_{0}}}\] | |
| 9540. |
Read the assertion and reason carefully to mark the correct option out of the options given below: Assertion : The stretching of a coil is determined by its shear modulus. Reason : Shear modulus change only shape of a body keeping its dimensions unchanged. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 9541. |
The minimum energy required to excite a hydrogen atom from its ground state is [EAMCET (Engg.) 1995; MP PMT 1997; CPMT 1999; DCE 1999] |
| A. | 13.6 eV |
| B. | \[-13.6\ eV\] |
| C. | 3.4eV |
| D. | 10.2 eV |
| Answer» E. | |
| 9542. |
In order to find time, the astronaut orbiting in an earth satellite should use [DPMT 1982] |
| A. | A pendulum clock |
| B. | A watch having main spring to keep it going |
| C. | Either a pendulum clock or a watch |
| D. | Neither a pendulum clock nor a watch |
| Answer» C. Either a pendulum clock or a watch | |
| 9543. |
Assertion : An adiabatic process is an isoentropic process. Reason : Change in entropy is zero in case of adiabatic process. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 9544. |
Assertion : A physical quantity cannot be called as a vector if its magnitude is zero. Reason : A vector has both, magnitude and direction. |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| E. | If assertion is false but reason is true. |
| Answer» F. | |
| 9545. |
In Bohr model of the hydrogen atom, the lowest orbit corresponds to [Manipal MEE 1995] |
| A. | Infinite energy |
| B. | The maximum energy |
| C. | The minimum energy |
| D. | Zero energy |
| Answer» D. Zero energy | |
| 9546. |
In an ac circuit I = 100 sin 200 pt. The time required for the current to achieve its peak value will be [DPMT 2003] |
| A. | \[\frac{1}{100}sec\] |
| B. | \[\frac{1}{200}sec\] |
| C. | \[\frac{1}{300}sec\] |
| D. | \[\frac{1}{400}sec\] |
| Answer» E. | |
| 9547. |
A bomb of mass 3.0 Kg explodes in air into two pieces of masses 2.0 kg and 1.0 kg. The smaller mass goes at a speed of 80 m/s. The total energy imparted to the two fragments is [AIIMS 2004] |
| A. | 1.07 kJ |
| B. | 2.14 kJ |
| C. | 2.4 kJ |
| D. | 4.8 KJ |
| Answer» E. | |
| 9548. |
An infinite number of charges, each of charge 1 mC, are placed on the x-axis with co-ordinates x = 1, 2, 4, 8, ....¥. If a charge of 1 C is kept at the origin, then what is the net force acting on 1 C charge [DCE 2004] |
| A. | 9000 N |
| B. | 12000 N |
| C. | 24000 N |
| D. | 36000 N |
| Answer» C. 24000 N | |
| 9549. |
Air is filled in a motor tube at \[{{27}^{o}}C\] and at a pressure of \[8\] atmospheres. The tube suddenly bursts, then temperature of air is \[[\text{Given}\,\,\gamma \,\text{of}\,\text{air}=\,1.5]\] [MP PMT 2002] |
| A. | \[{{27.5}^{o}}C\] |
| B. | \[{{75}^{o}}K\] |
| C. | \[150\,K\] |
| D. | \[{{150}^{o}}C\] |
| Answer» D. \[{{150}^{o}}C\] | |
| 9550. |
The first line of Balmer series has wavelength 6563 Å. What will be the wavelength of the first member of Lyman series [RPMT 1996] |
| A. | 1215.4 Å |
| B. | 2500 Å |
| C. | 7500 Å |
| D. | 600 Å |
| Answer» B. 2500 Å | |