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.
| 10401. |
Assertion : \[\vec{A}\times \vec{B}\] is perpendicular to both \[\vec{A}+\vec{B}\] as well as \[\vec{A}-\vec{B}.\] Reason : \[\vec{A}+\vec{B}\] as well as \[\vec{A}-\vec{B}\] lie in the plane containing \[\vec{A}\] and \[\vec{B}\], but \[\vec{A}\times \vec{B}\] lies perpendicular to the plane containing \[\vec{A}\] and \[\vec{B}.\] |
| 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. | |
| 10402. |
A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then [IIT-JEE 1993] |
| A. | The magnetic field at all points inside the pipe is the same but not zero |
| B. | The magnetic field at any point inside the pipe is zero |
| C. | The magnetic field is zero only on the axis of the pipe |
| D. | The magnetic field is different at different points inside the pipe |
| Answer» C. The magnetic field is zero only on the axis of the pipe | |
| 10403. |
Assertion : The velocity of fall of a man jumping with a parachute first increases and then becomes constant. Reason : The constant velocity of fall of man is called terminal velocity. |
| 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. | |
| 10404. |
The frequency of ac mains in India is [NCERT 1974; MP PMT/PET 1988; RPMT 1997; RPET 2000] |
| A. | 30 c/s or Hz |
| B. | 50 c/s or Hz |
| C. | 60 c/s or Hz |
| D. | 120 c/s or Hz |
| Answer» C. 60 c/s or Hz | |
| 10405. |
Voltage in the secondary coil of a transformer does not depend upon. [BHU 2000] |
| A. | Voltage in the primary coil |
| B. | Ratio of number of turns in the two coils |
| C. | Frequency of the source |
| D. | Both (a) and (b) |
| Answer» D. Both (a) and (b) | |
| 10406. |
Dielectric constant of pure water is 81. Its permittivity will be [CPMT 1984] |
| A. | \[7.12\times {{10}^{-10}}\,MKS\] units |
| B. | \[8.86\times {{10}^{-12}}MKS\] units |
| C. | \[1.02\times {{10}^{13}}\ MKS\] units |
| D. | Cannot be calculated |
| Answer» B. \[8.86\times {{10}^{-12}}MKS\] units | |
| 10407. |
Assertion : The colour of the green flower seen through red glass appears to be dark. Reason : Red glass transmits only red light. [AIIMS 1997] |
| 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. | |
| 10408. |
A body of mass m is taken to the bottom of a deep mine. Then [NCERT 1982] |
| A. | Its mass increases |
| B. | Its mass decreases |
| C. | Its weight increases |
| D. | Its weight decreases |
| Answer» E. | |
| 10409. |
For cooking the food, which of the following type of utensil is most suitable [MNR 1986; MP PET 1990; CPMT 1991; SCRA 1998; MP PMT/PET 1998, 2000; RPET 2001] |
| A. | High specific heat and low conductivity |
| B. | High specific heat and high conductivity |
| C. | Low specific heat and low conductivity |
| D. | Low specific heat and high conductivity |
| Answer» E. | |
| 10410. |
L, C and R represent physical quantities inductance, capacitance and resistance respectively. The combination representing dimension of frequency is [MP PET 1995; DCE 2001] |
| A. | LC |
| B. | \[{{(LC)}^{-1/2}}\] |
| C. | \[{{\left( \frac{L}{C} \right)}^{-1/2}}\] |
| D. | \[\frac{C}{L}\] |
| Answer» C. \[{{\left( \frac{L}{C} \right)}^{-1/2}}\] | |
| 10411. |
At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking \[g=10\,m/{{s}^{2}})\] [NCERT 1984] |
| A. | \[20\,m/{{s}^{2}}\] |
| B. | \[10\,m/{{s}^{2}}\] |
| C. | \[2\,m/{{s}^{2}}\] |
| D. | \[1\,m/{{s}^{2}}\] |
| Answer» C. \[2\,m/{{s}^{2}}\] | |
| 10412. |
Assertion : Bodies radiate heat at all temperatures. Reason : Rate of radiation of heat is proportional to the fourth power of absolute temperature. [AIIMS 1999, 2002] |
| 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. | |
| 10413. |
If the density of oxygen is 16 times that of hydrogen, what will be the ratio of their corresponding velocities of sound waves [KCET 1999] |
| A. | 1 : 4 |
| B. | 4 : 1 |
| C. | 16 : 1 |
| D. | 1 : 16 |
| Answer» B. 4 : 1 | |
| 10414. |
If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 1m, then the frequency of sound is [KCET 1999] |
| A. | 90 Hz |
| B. | 180 Hz |
| C. | 360 Hz |
| D. | 720 Hz |
| Answer» C. 360 Hz | |
| 10415. |
At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 100oC [UPSEAT 1999] |
| A. | ? 148oC |
| B. | ? 212.5oC |
| C. | ? 317.5oC |
| D. | ? 249.7oC |
| Answer» E. | |
| 10416. |
Energy of electron in a orbit of H-atom is [RPET 2000] |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Nothing can be said |
| Answer» C. Zero | |
| 10417. |
Four lowest energy levels of H-atom are shown in the figure. The number of possible emission lines would be [MP PMT 2001] |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» E. | |
| 10418. |
An ideal transformer has 500 and 5000 turn in primary and secondary windings respectively. If the primary voltage is connected to a 6V battery then the secondary voltage is [Orissa JEE 2003] |
| A. | 0 |
| B. | 60 V |
| C. | 0.6 V |
| D. | 6.0 V |
| Answer» B. 60 V | |
| 10419. |
Assertion : For cooking in a microwave oven, food is always kept in metal containers. Reason : The energy of microwave is easily transferred to the food in metal container. |
| 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. | |
| 10420. |
Assertion : Short wave bands are used for transmission of ratio waves to a large distance Reason : Short waves are reflected by ionosphere [AIIMS 1994] |
| 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. | |
| 10421. |
Assertion : X-ray astronomy is possible only from satellites orbiting the earth. Reason : Efficiency of X-rays telescope is large as compared to any other telescope. |
| 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. | |
| 10422. |
Assertion : It is impossible to photograph a virtual image. Reason : The rays which appear diverging from a virtual image fall on the camera and a real image is captured. |
| 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. | |
| 10423. |
Assertion : Spherical aberration occur in lenses of larger aperture. Reason : The two rays, paraxial and marginal rays focus at different points. |
| 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. | |
| 10424. |
Assertion : An empty test tube dipped into water in a beaker appears silver, when viewed from a suitable direction. Reason : Due to refraction of light, the substance in water appears silvery. |
| 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. | |
| 10425. |
If the capacity of a spherical conductor is 1 picofarad, then its diameter, would be [Pb. PMT 1999] |
| A. | \[1.8\times {{10}^{-3}}m\] |
| B. | \[18\times {{10}^{-3}}m\] |
| C. | \[1.8\times {{10}^{-5}}m\] |
| D. | \[18\times {{10}^{-7}}m\] |
| Answer» C. \[1.8\times {{10}^{-5}}m\] | |
| 10426. |
A 0.10 kg block oscillates back and forth along a horizontal surface. Its displacement from the origin is given by: \[x=(10\,cm)\cos [(10\,rad/s)\,t+\pi /2\,rad]\]. What is the maximum acceleration experienced by the block [AMU (Engg.) 2000] |
| A. | \[10\,\,m/{{s}^{2}}\] |
| B. | \[10\,\pi \,m/{{s}^{2}}\] |
| C. | \[\frac{10\pi }{2}\,m/{{s}^{2}}\] |
| D. | \[\frac{10\pi }{3}\,m/{{s}^{2}}\] |
| Answer» B. \[10\,\pi \,m/{{s}^{2}}\] | |
| 10427. |
Assertion : Soft iron is used as transformer core. Reason : Soft iron has narrow hysteresis loop. |
| 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. | |
| 10428. |
If the stone is thrown up vertically and return to ground, its potential energy is maximum [EAMCET 1979] |
| A. | During the upward journey |
| B. | At the maximum height |
| C. | During the return journey |
| D. | At the bottom |
| Answer» C. During the return journey | |
| 10429. |
Assertion : The cloud in sky generally appear to be whitish. Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths. [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. | |
| 10430. |
Assertion : Interference pattern is made by using blue light instead of red light, the fringes becomes narrower. Reason : In Young?s double slit experiment, fringe width is given by relation \[B=\frac{\lambda D}{d}\]. [AIIMS 1999] |
| 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. | |
| 10431. |
Assertion : In adiabatic compression, the internal energy and temperature of the system get decreased. Reason : The adiabatic compression is a slow process [AIIMS 2001] |
| 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. | |
| 10432. |
Two long capillary tubes A and B of radius RB>RA dipped in same liquid. Then [Orissa PMT 2004] |
| A. | Water rise is more in A than B |
| B. | Water rises more in B than A |
| C. | Same water rise in both |
| D. | All of these according to the density of water |
| Answer» B. Water rises more in B than A | |
| 10433. |
Acceleration due to gravity is ?g? on the surface of the earth. The value of acceleration due to gravity at a height of 32 km above earth?s surface is (Radius of the earth = 6400 km) [KCET (Engg./Med.) 1999] |
| A. | 0.9 g |
| B. | 0.99 g |
| C. | 0.8 g |
| D. | 1.01 g |
| Answer» C. 0.8 g | |
| 10434. |
The ratio of the diameters of two metallic rods of the same material is 2 : 1 and their lengths are in the ratio 1 : 4. If the temperature difference between their ends are equal, the rate of flow of heat in them will be in the ratio [MP PET 1994] |
| A. | 2 : 1 |
| B. | 4 : 1 |
| C. | \[8:1\] |
| D. | 16 : 1 |
| Answer» E. | |
| 10435. |
If instantaneous current is given by \[i=4\cos \,(\omega \,t+\varphi )\] amperes, then the r.m.s. value of current is [RPET 2000] |
| A. | 4 amperes |
| B. | \[2\sqrt{2}\] amperes |
| C. | \[4\sqrt{2}\] amperes |
| D. | Zero amperes |
| Answer» C. \[4\sqrt{2}\] amperes | |
| 10436. |
A person goes 10 km north and 20 km east. What will be displacement from initial point [AFMC 1994, 2003] |
| A. | 22.36 km |
| B. | 2 km |
| C. | 5 km |
| D. | 20 km |
| Answer» B. 2 km | |
| 10437. |
If the earth rotates faster than its present speed, the weight of an object will [Haryana CEE 1996] |
| A. | Increase at the equator but remain unchanged at the poles |
| B. | Decrease at the equator but remain unchanged at the poles |
| C. | Remain unchanged at the equator but decrease at the poles |
| D. | Remain unchanged at the equator but increase at the poles |
| Answer» C. Remain unchanged at the equator but decrease at the poles | |
| 10438. |
Assertion : The molecules at 0ºC ice and 0ºC water will have same potential energy. Reason : Potential energy depends only on temperature of the system. |
| 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. | |
| 10439. |
Calculate the amount of heat (in calories) required to convert 5 gm of ice at 0°C to steam at 100° [DPMT 2005] |
| A. | 3100 |
| B. | 3200 |
| C. | 3600 |
| D. | 4200 |
| Answer» D. 4200 | |
| 10440. |
Assertion : The speed of light in a rarer medium is greater than that in a denser medium Reason : One light year equals to 9.5 × 1012 km [AIIMS 1999] |
| 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. | |
| 10441. |
A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is |
| A. | \[\infty \] |
| B. | Zero |
| C. | \[\frac{{{\mu }_{0}}}{4\pi }\frac{2i}{r}\] |
| D. | \[\frac{{{\mu }_{0}}}{4\pi }\frac{2\pi \,i}{r}\] |
| Answer» C. \[\frac{{{\mu }_{0}}}{4\pi }\frac{2i}{r}\] | |
| 10442. |
A charge of Q coulomb is placed on a solid piece of metal of irregular shape. The charge will distribute itself [MP PMT 1991] |
| A. | Uniformly in the metal object |
| B. | Uniformly on the surface of the object |
| C. | Such that the potential energy of the system is minimized |
| D. | Such that the total heat loss is minimized |
| Answer» D. Such that the total heat loss is minimized | |
| 10443. |
Assertion : The coulomb force is the dominating force in the universe. Reason : The coulomb force is weaker than the gravitational force. [AIIMS 2003] |
| 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. | |
| 10444. |
Assertion : Faraday?s laws are consequences of conservation of energy. Reason : In a purely resistive ac circuit, the current lags behind the e.m.f. in phase. [AIIMS 2002] |
| 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. | |
| 10445. |
The slopes of isothermal and adiabatic curves are related as [CPMT 1971; BHU 1996; MH CET 1999; UPSEAT 2000; RPET 2003] |
| A. | Isothermal curve slope = adiabatic curve slope |
| B. | Isothermal curve slope = \[\gamma \times \] adiabatic curve slope |
| C. | Adiabatic curve slope = \[\gamma \times \] isothermal curve slope |
| D. | Adiabatic curve slope = \[\frac{1}{2}\times \]isothermal curve slope |
| Answer» D. Adiabatic curve slope = \[\frac{1}{2}\times \]isothermal curve slope | |
| 10446. |
5 g of ice at 0°C is dropped in a beaker containing 20 g of water at 40°C. The final temperature will be [Pb. PET 2003] |
| A. | 32°C |
| B. | 16°C |
| C. | 8°C |
| D. | 24°C |
| Answer» C. 8°C | |
| 10447. |
A parallel plate capacitor has a capacity \[C\]. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes\[2C\], the dielectric constant of the medium is [Haryana CEE 1996] |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 8 |
| Answer» D. 8 | |
| 10448. |
An air capacitor of capacity \[C=10\mu F\]is connected to a constant voltage battery of\[12\,V\]. Now the space between the plates is filled with a liquid of dielectric constant 5. The charge that flows now from battery to the capacitor is [MP PMT 1997] |
| A. | \[120\mu C\] |
| B. | \[699\mu C\] |
| C. | \[480\mu C\] |
| D. | \[24\mu C\] |
| Answer» D. \[24\mu C\] | |
| 10449. |
In the nth orbit, the energy of an electron \[{{E}_{n}}=-\frac{13.6}{{{n}^{2}}}eV\]for hydrogen atom. The energy required to take the electron from first orbit to second orbit will be [MP PMT 1987; CPMT 1991, 97; RPMT 1999; DCE 2001; Kerala PMT 2004] |
| A. | \[10.2\ eV\] |
| B. | \[12.1\ eV\] |
| C. | \[13.6\ eV\] |
| D. | \[3.4\ eV\] |
| Answer» B. \[12.1\ eV\] | |
| 10450. |
Assertion : The periodic time of a hard spring is less as compared to that of a soft spring. Reason : The periodic time depends upon the spring constant, and spring constant is large for hard spring. |
| 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. | |