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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.
| 10851. |
Assertion : Damped oscillation indicates loss of energy. Reason : The energy loss in damped oscillation may be due to friction, air resistance etc. |
| 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. | |
| 10852. |
Assertion : A piece of red glass is heated till it glows in dark. The colour of glowing glass would be orange. Reason : Red and orange is complementary colours. |
| 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. | |
| 10853. |
Assertion : Critical angle of light passing from glass to air is minimum for violet colour. Reason : The wavelength of blue light is greater than the light of other colours. |
| 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. | |
| 10854. |
Assertion : We cannot produce a real image by plane or convex mirrors under any circumstances. Reason : The focal length of a convex mirror is always taken as positive. |
| 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. | |
| 10855. |
Heat required to convert one gram of ice at 0°C into steam at 100°C is (given Lsteam = 536 cal/gm) [Pb. PMT 1990] |
| A. | 100 calorie |
| B. | 0.01 kilocalorie |
| C. | 716 calorie |
| D. | 1 kilocalorie |
| Answer» D. 1 kilocalorie | |
| 10856. |
If the linear momentum is increased by 50%, the kinetic energy will increase by [CPMT 1983; MP PMT 1994; MP PET 1996, 99; UPSEAT 2001] |
| A. | 50% |
| B. | 100% |
| C. | 125% |
| D. | 25% |
| Answer» D. 25% | |
| 10857. |
Assertion : Surface of a symmetrical conductor can be treated as equipotential surface. Reason : Charges can easily flow in a 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» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 10858. |
Assertion : Like light radiations, thermal radiations are also electromagnetic radiation. Reason : The thermal radiations require no medium for propagation. |
| 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. | |
| 10859. |
If M the mass of the earth and R its radius, the ratio of the gravitational acceleration and the gravitational constant is [J&K CET 2005] |
| A. | \[\frac{{{R}^{2}}}{M}\] |
| B. | \[\frac{M}{{{R}^{2}}}\] |
| C. | \[M{{R}^{2}}\] |
| D. | \[\frac{M}{R}\] |
| Answer» C. \[M{{R}^{2}}\] | |
| 10860. |
A spherical drop of capacitance 1 mF is broken into eight drops of equal radius. Then, the capacitance of each small drop is ...... [KCET 2004] |
| A. | \[\frac{1}{8}\mu F\] |
| B. | \[8\mu F\] |
| C. | \[\frac{1}{2}\mu F\] |
| D. | \[\frac{1}{4}\mu F\] |
| Answer» D. \[\frac{1}{4}\mu F\] | |
| 10861. |
Assertion : Only a change in magnetic flux will maintain an induced current the coil. Reason : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous. [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» D. If the assertion and reason both are false. | |
| 10862. |
A scooter going due east at 10 ms?1 turns right through an angle of 90°. If the speed of the scooter remains unchanged in taking turn, the change is the velocity of the scooter is [BHU 1994] |
| A. | \[\text{2}0.0m{{s}^{\text{1}}}\] south eastern direction |
| B. | Zero |
| C. | \[\text{1}0.0m{{s}^{\text{1}}}\] in southern direction |
| D. | \[\text{14}.\text{14}m{{s}^{\text{1}}}\] in south-west direction |
| Answer» E. | |
| 10863. |
The magnetic field at a distance r from a long wire carrying current i is 0.4 Tesla. The magnetic field at a distance 2r is [CBSE PMT 1992; DPMT 2004] |
| A. | 0.2 Tesla |
| B. | 0.8 Tesla |
| C. | 0.1 Tesla |
| D. | 1.6 Tesla |
| Answer» B. 0.8 Tesla | |
| 10864. |
How many grams of a liquid of specific heat 0.2 at a temperature 40°C must be mixed with 100 gm of a liquid of specific heat of 0.5 at a temperature 20°C, so that the final temperature of the mixture becomes 32°C [Pb. PET 1999] |
| A. | 175 gm |
| B. | 300 g |
| C. | 295 gm |
| D. | 375 g |
| Answer» E. | |
| 10865. |
A particle of mass 'm' and charge 'q' is accelerated through a potential difference of 'V' volt. Its energy is [UPSEAT 2001] |
| A. | \[qV\] |
| B. | \[mq\,V\] |
| C. | \[\left( \frac{q}{m} \right)\,V\] |
| D. | \[\frac{q}{m\,V}\] |
| Answer» B. \[mq\,V\] | |
| 10866. |
A ball of mass 2kg and another of mass 4kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of [CBSE PMT 2004] |
| A. | \[\sqrt{2}:1\] |
| B. | \[1:4\] |
| C. | \[1:2\] |
| D. | \[1:\sqrt{2}\] |
| Answer» D. \[1:\sqrt{2}\] | |
| 10867. |
Assertion : \[\vec{\tau }=\vec{r}\times \vec{F}\text{ and}\vec{\tau }\ne \vec{F}\times \text{ }\vec{r}\] Reason : Cross product of vectors is commutative. |
| 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. | |
| 10868. |
Radius of first Bohr orbit is r. What is the radius of 2nd Bohr orbit? [BHU 2005] |
| A. | 8r |
| B. | 2r |
| C. | 4r |
| D. | \[2\sqrt{2r}\] |
| Answer» D. \[2\sqrt{2r}\] | |
| 10869. |
The height of a waterfall is 84 metre. Assuming that the entire kinetic energy of falling water is converted into heat, the rise in temperature of the water will be \[(g=9.8\,m/{{s}^{2}},\ J=4.2\,joule/cal)\] [MP PET 1994] |
| A. | 0.196°C |
| B. | 1.960°C |
| C. | 0.96°C |
| D. | 0.0196°C |
| Answer» B. 1.960°C | |
| 10870. |
The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance [MP PET 1991] |
| A. | Vacuum is created between two spheres |
| B. | Dielectric material is filled between the two spheres |
| C. | The space between two spheres is increased |
| D. | The earthing of the outer sphere is removed |
| Answer» C. The space between two spheres is increased | |
| 10871. |
Weight of a body is maximum at [AFMC 2001] |
| A. | Moon |
| B. | Poles of earth |
| C. | Equator of earth |
| D. | Centre of earth |
| Answer» C. Equator of earth | |
| 10872. |
Assertion : The value of dynamic friction is less than the limiting friction. Reason : Once the motion has started, the inertia of rest has been overcome. |
| 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. | |
| 10873. |
The quality factor of LCR circuit having resistance (R) and inductance (L) at resonance frequency (\[\omega \]) is given by [AFMC 2000; CBSE PMT 2000] |
| A. | \[\frac{\omega L}{R}\] |
| B. | \[\frac{R}{\omega L}\] |
| C. | \[{{\left( \frac{\omega L}{R} \right)}^{1/2}}\] |
| D. | \[{{\left( \frac{\omega L}{R} \right)}^{2}}\] |
| Answer» B. \[\frac{R}{\omega L}\] | |
| 10874. |
The ratio of areas within the electron orbits for the first excited state to the ground state for hydrogen atom is [BCECE 2004] |
| A. | 16 : 1 |
| B. | 18 : 1 |
| C. | 4 : 1 |
| D. | 2 : 1 |
| Answer» E. | |
| 10875. |
Assertion : Microwave propagation is better than the sky wave propagation. Reason : Microwaves have frequencies 100 to 300 GHz, which have very good directional properties. |
| 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. | |
| 10876. |
Assertion : Thermocouple acts as a heat engine. Reason : When two junctions of thermocouple are at different temperature, thermo e.m.f. is produced. |
| 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. | |
| 10877. |
Two insulated charged spheres of radii \[20\,cm\] and \[25\,cm\]respectively and having an equal charge \[Q\] are connected by a copper wire, then they are separated [NCERT 1971] |
| A. | Both the spheres will have the same charge \[Q\] |
| B. | Charge on the \[20\ cm\] sphere will be greater than that on the \[25\ cm\] sphere |
| C. | Charge on the \[25\ cm\] sphere will be greater than that on the \[20\ cm\] sphere |
| D. | Charge on each of the sphere will be \[2Q\] |
| Answer» D. Charge on each of the sphere will be \[2Q\] | |
| 10878. |
Two charges \[{{q}_{1}}\]and \[{{q}_{2}}\]are placed in vacuum at a distance \[d\] and the force acting between them is \[F\]. If a medium of dielectric constant 4 is introduced around them, the force now will be [MP PMT 1994] |
| A. | \[4F\] |
| B. | \[2F\] |
| C. | \[\frac{F}{2}\] |
| D. | \[\frac{F}{4}\] |
| Answer» E. | |
| 10879. |
A condenser has a capacity \[2\mu \,F\] and is charged to a voltage of 50 V. The energy stored is [MH CET 2002] |
| A. | \[\text{25}\times \text{1}{{0}^{\text{5}}}Joule\] |
| B. | 25 Joule |
| C. | 25 ´ 10 erg |
| D. | \[\text{25}\times \text{1}{{0}^{\text{3}}}erg\] |
| Answer» E. | |
| 10880. |
The disc of a siren containing 60 holes rotates at a constant speed of 360 rpm. The emitted sound is in unison with a tuning fork of frequency [KCET 2005] |
| A. | 10 Hz |
| B. | 360 Hz |
| C. | 216 Hz |
| D. | 6 Hz |
| Answer» C. 216 Hz | |
| 10881. |
When a tuning fork produces sound waves in air, which one of the following is same in the material of tuning fork as well as in air [AFMC 2005] |
| A. | Wavelength |
| B. | Frequency |
| C. | Velocity |
| D. | Amplitude |
| Answer» C. Velocity | |
| 10882. |
Two vibrating tuning forks produce progressive waves given by \[{{Y}_{1}}=4\sin 500\pi t\]and \[{{Y}_{2}}=2\sin 506\pi t.\] Number of beats produced per minute is [CBSE PMT 2005] |
| A. | 360 |
| B. | 180 |
| C. | 3 |
| D. | 60 |
| Answer» C. 3 | |
| 10883. |
When an electron in hydrogen atom is excited, from its 4th to 5th stationary orbit, the change in angular momentum of electron is (Planck?s constant: \[h=6.6\times {{10}^{-34}}J\text{-s}\]) [AFMC 2000; Pb. PET 2001] |
| A. | \[4.16\times {{10}^{-34}}\,J\text{-}s\] |
| B. | \[3.32\times {{10}^{-34}}\,J\text{-}s\] |
| C. | \[1.05\times {{10}^{-34}}\,J\text{-}s\] |
| D. | \[2.08\times {{10}^{-34}}\,J\text{-}s\] |
| Answer» D. \[2.08\times {{10}^{-34}}\,J\text{-}s\] | |
| 10884. |
The amount of substance liberated on electrodes during electrolysis when 1 coulomb of electricity is passed, is |
| A. | Chemical equivalent |
| B. | Electrochemical equivalent |
| C. | Equivalent weight |
| D. | One mol |
| Answer» C. Equivalent weight | |
| 10885. |
If both the mass and the radius of the earth decrease by 1%, the value of the acceleration due to gravity will [MP PET 2004] |
| A. | Decrease by 1% |
| B. | Increase by 1% |
| C. | Increase by 2% |
| D. | Remain unchanged |
| Answer» C. Increase by 2% | |
| 10886. |
Assertion : When PN-junction is forward biased then motion of charge carriers at junction is due to diffusion. In reverse biasing. The cause of motion of charge is drifting. Reason : In the following circuit emitter is reverse biased and collector is forward biased. |
| 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. | |
| 10887. |
Assertion : De-morgan's theorem \[\overline{A+B}=\bar{A}\cdot \bar{B}\] may be explained by the following circuit Reason : In the following circuit, for output inputs ABC are 101 |
| 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. | |
| 10888. |
Radius of earth is around 6000 km. The weight of body at height of 6000 km from earth surface becomes [RPMT 1997] |
| A. | Half |
| B. | One-fourth |
| C. | One third |
| D. | No change |
| Answer» C. One third | |
| 10889. |
A 40 W electric heater is connected to a 200 V, 50 Hz mains supply. The peak value of electric current flowing in the circuit is approximately [MP PET 1992] |
| A. | 2.5 A |
| B. | 5.0 A |
| C. | 7 A |
| D. | 10 A |
| Answer» D. 10 A | |
| 10890. |
Assertion : A spark occur between the poles of a switch when the switch is opened. Reason : Current flowing in the conductor produces magnetic field. |
| 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. | |
| 10891. |
Radius of a capillary is \[2\times {{10}^{-3}}m.\] A liquid of weight \[6.28\times {{10}^{-4}}N\] may remain in the capillary then the surface tension of liquid will be [RPET 2003] |
| A. | \[5\times {{10}^{-3}}N/m\] |
| B. | \[5\times {{10}^{-2}}N/m\] |
| C. | \[5\,N/m\] |
| D. | \[50\,N/m\] |
| Answer» C. \[5\,N/m\] | |
| 10892. |
A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. by what velocity the gun rebounds backwards [CBSE PMT 1996; JIPMER 2000] |
| A. | 0.1 m/s |
| B. | 10 m/s |
| C. | 1 m/s |
| D. | 0.01 m/s |
| Answer» D. 0.01 m/s | |
| 10893. |
Assertion : Woolen clothes keep the body warm in winter. Reason : Air is a bad conductor of heat. [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» B. If both assertion and reason are true but reason is not the correct explanation of the assertion. | |
| 10894. |
Assertion : The internal energy of an isothermal process does not change. Reason : The internal energy of a system depends only on pressure 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» D. If the assertion and reason both are false. | |
| 10895. |
Assertion : Sound waves cannot propagate through vacuum but light waves can. Reason : Sound waves cannot be polarised but light waves can be polarised. [AIIMS 1998] |
| 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. | |
| 10896. |
Sound waves of wavelength greater than that of audible sound are called [KCET 1999] |
| A. | Seismic waves |
| B. | Sonic waves |
| C. | Ultrasonic waves |
| D. | Infrasonic waves |
| Answer» E. | |
| 10897. |
Assertion : Ocean waves hitting a beach are always found to be nearly normal to the shore. Reason : Ocean waves are longitudinal waves. |
| 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. | |
| 10898. |
Assertion : The velocity of sound increases with increase in humidity. Reason : Velocity of sound does not depend upon the medium. |
| 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. | |
| 10899. |
?SONAR? emits which of the following waves [AIIMS 1999] |
| A. | Radio waves |
| B. | Ultrasonic waves |
| C. | Light waves |
| D. | Magnetic waves |
| Answer» C. Light waves | |
| 10900. |
Which of the following do not require medium for transmission [RPMT 2000] |
| A. | Cathode ray |
| B. | Electromagnetic wave |
| C. | Sound wave |
| D. | None of the above |
| Answer» C. Sound wave | |