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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.
| 4551. |
The maximum velocity at the lowest point, so that the string just slack at the highest point in a vertical circle of radius \[l\] [CPMT 1999; MH CET 2004] |
| A. | \[\sqrt{gl}\] |
| B. | \[\sqrt{3gl}\] |
| C. | \[\sqrt{5gl}\] |
| D. | \[\sqrt{7gl}\] |
| Answer» D. \[\sqrt{7gl}\] | |
| 4552. |
A weightless thread can bear tension upto 3.7 kg wt. A stone of mass 500 gms is tied to it and revolved in a circular path of radius 4 m in a vertical plane. If \[g=10\,m{{s}^{-2}}\], then the maximum angular velocity of the stone will be [MP PMT/PET 1998] |
| A. | 4 radians/sec |
| B. | 16 radians/sec |
| C. | \[\sqrt{21}\] radians/sec |
| D. | 2 radians/sec |
| Answer» B. 16 radians/sec | |
| 4553. |
A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break [MP PET 1997] |
| A. | When the mass is at the highest point of the circle |
| B. | When the mass is at the lowest point of the circle |
| C. | When the wire is horizontal |
| D. | At an angle of \[{{\cos }^{-1}}(1/3)\] from the upward vertical |
| Answer» C. When the wire is horizontal | |
| 4554. |
A particle originally at rest at the highest point of a smooth vertical circle is slightly displaced. It will leave the circle at a vertical distance h below the highest point such that |
| A. | \[h=R\] |
| B. | \[h=\frac{R}{3}\] |
| C. | \[h=\frac{R}{2}\] |
| D. | \[h=\frac{2R}{3}\] |
| Answer» C. \[h=\frac{R}{2}\] | |
| 4555. |
A weightless thread can support tension upto 30 N. A stone of mass 0.5 kg is tied to it and is revolved in a circular path of radius 2 m in a vertical plane. If \[g=10m/{{s}^{2}}\], then the maximum angular velocity of the stone will be [MP PMT 1994] |
| A. | \[5\,\,rad/s\] |
| B. | \[\sqrt{30}\,rad/s\] |
| C. | \[\sqrt{60}\,rad/s\] |
| D. | \[10\,rad/s\] |
| Answer» B. \[\sqrt{30}\,rad/s\] | |
| 4556. |
A car is moving with speed 30 \[m/\sec \]on a circular path of radius 500 m. Its speed is increasing at the rate of \[2m/{{\sec }^{2}},\] What is the acceleration of the car [MP PMT 2003; Roorkee 1982; RPET 1996; MH CET 2002] |
| A. | \[2m/{{\sec }^{2}}\] |
| B. | \[2.7m/{{\sec }^{2}}\] |
| C. | \[1.8m/{{\sec }^{2}}\] |
| D. | \[9.8\,m/{{\sec }^{2}}\] |
| Answer» C. \[1.8m/{{\sec }^{2}}\] | |
| 4557. |
The string of pendulum of length \[l\] is displaced through \[{{90}^{o}}\] from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is [MP PMT 1986] |
| A. | \[mg\] |
| B. | \[3mg\] |
| C. | \[5\,mg\] |
| D. | \[6\,mg\] |
| Answer» C. \[5\,mg\] | |
| 4558. |
A body slides down a frictionless track which ends in a circular loop of diameter \[D\], then the minimum height \[h\] of the body in term of \[D\] so that it may just complete the loop, is |
| A. | \[h=\frac{5D}{2}\] |
| B. | \[h=\frac{5D}{4}\] |
| C. | \[h=\frac{3D}{4}\] |
| D. | \[h=\frac{D}{4}\] |
| Answer» C. \[h=\frac{3D}{4}\] | |
| 4559. |
In a circus stuntman rides a motorbike in a circular track of radius \[R\] in the vertical plane. The minimum speed at highest point of track will be [CPMT 1979; JIPMER 1997; RPET 1999] |
| A. | \[\sqrt{2gR}\] |
| B. | \[2gR\] |
| C. | \[\sqrt{3gR}\] |
| D. | \[\sqrt{gR}\] |
| Answer» E. | |
| 4560. |
Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is [CBSE PMT 1995; RPMT 2003] |
| A. | \[v=\frac{1}{2R}\sqrt{\frac{1}{Gm}}\] |
| B. | \[v=\sqrt{\frac{Gm}{2R}}\] |
| C. | \[v=\frac{1}{2}\sqrt{\frac{Gm}{R}}\] |
| D. | \[v=\sqrt{\frac{4Gm}{R}}\] |
| Answer» D. \[v=\sqrt{\frac{4Gm}{R}}\] | |
| 4561. |
The gravitational force between two stones of mass 1 kg each separated by a distance of 1 metre in vacuum is [DPMT 1984] |
| A. | Zero |
| B. | \[6.675\times {{10}^{-5}}\,newton\] |
| C. | \[6.675\times {{10}^{-11}}\,newton\] |
| D. | \[6.675\times {{10}^{-8}}\,newton\] |
| Answer» D. \[6.675\times {{10}^{-8}}\,newton\] | |
| 4562. |
Which of the following is the evidence to show that there must be a force acting on earth and directed towards the sun [AIIMS 1980] |
| A. | Deviation of the falling bodies towards east |
| B. | Revolution of the earth round the sun |
| C. | Phenomenon of day and night |
| D. | Apparent motion of sun round the earth |
| Answer» C. Phenomenon of day and night | |
| 4563. |
If the distance between two masses is doubled, the gravitational attraction between them [CPMT 1973; AMU (Med.) 2000] |
| A. | Is doubled |
| B. | Becomes four times |
| C. | Is reduced to half |
| D. | Is reduced to a quarter |
| Answer» E. | |
| 4564. |
The weight of a body at the centre of the earth is [AFMC 1988] |
| A. | Zero |
| B. | Infinite |
| C. | Same as on the surface of earth |
| D. | None of the above |
| Answer» B. Infinite | |
| 4565. |
The atmosphere is held to the earth by [IIT 1986] |
| A. | Winds |
| B. | Gravity |
| C. | Clouds |
| D. | None of the above |
| Answer» C. Clouds | |
| 4566. |
A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will [AIIMS 1982; AIEEE 2002] |
| A. | Continue to move with velocity v along the original orbit |
| B. | Move with a velocity v, tangentially to the original orbit |
| C. | Fall down with increasing velocity |
| D. | Ultimately come to rest somewhere on the original orbit |
| Answer» C. Fall down with increasing velocity | |
| 4567. |
Which of the following statements about the gravitational constant is true [Kerala PET 2005] |
| A. | It is a force |
| B. | It has no unit |
| C. | It has same value in all systems of units |
| D. | It depends on the value of the masses |
| E. | It does not depend on the nature of the medium in which the bodies are kept. |
| Answer» F. | |
| 4568. |
Two identical solid copper spheres of radius R placed in contact with each other. The gravitational attracton between them is proportional to [Kerala PET 2005] |
| A. | \[{{R}^{2}}\] |
| B. | \[{{R}^{-2}}\] |
| C. | \[{{R}^{4}}\] |
| D. | \[{{R}^{-4}}\] |
| Answer» D. \[{{R}^{-4}}\] | |
| 4569. |
Two sphere of mass m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be [CBSE PMT 2003] |
| A. | F |
| B. | \[\frac{F}{3}\] |
| C. | \[\frac{F}{9}\] |
| D. | 3 F |
| Answer» B. \[\frac{F}{3}\] | |
| 4570. |
The gravitational force \[{{F}_{g}}\] between two objects does not depend on [RPET 2003] |
| A. | Sum of the masses |
| B. | Product of the masses |
| C. | Gravitational constant |
| D. | Distance between the masses |
| Answer» B. Product of the masses | |
| 4571. |
If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect [NCERT 1978] |
| A. | Viscous forces |
| B. | As it depends on the weight of the body. |
| C. | Electrostatic force |
| D. | None of the above |
| Answer» C. Electrostatic force | |
| 4572. |
The force of gravitation is [AIIMS 2002] |
| A. | Repulsive |
| B. | Electrostatic |
| C. | Conservative |
| D. | Non-conservative |
| Answer» D. Non-conservative | |
| 4573. |
Mass M is divided into two parts xM and \[(1-x)\,M\]. For a given separation, the value of x for which the gravitational attraction between the two pieces becomes maximum is [EAMCET 2001] |
| A. | \[\frac{1}{2}\] |
| B. | \[\frac{3}{5}\] |
| C. | 1 |
| D. | 2 |
| Answer» B. \[\frac{3}{5}\] | |
| 4574. |
Reason of weightlessness in a satellite is [RPMT 2000] |
| A. | Zero gravity |
| B. | Centre of mass |
| C. | Zero reaction force by satellite surface |
| D. | None |
| Answer» D. None | |
| 4575. |
The centripetal force acting on a satellite orbiting round the earth and the gravitational force of earth acting on the satellite both equal F. The net force on the satellite is [AMU 1999] |
| A. | Zero |
| B. | F |
| C. | \[F\sqrt{2}\] |
| D. | 2 F |
| Answer» C. \[F\sqrt{2}\] | |
| 4576. |
The mass of the moon is \[7.34\times {{10}^{22}}\,kg\] and the radius is \[1.74\times {{10}^{6}}\,m\]. The value of gravitation force will be [AMU 1999] |
| A. | 1.45 N/kg |
| B. | 1.55 N/kg |
| C. | 1.75 N/kg |
| D. | 1.62 N/kg |
| Answer» E. | |
| 4577. |
Who among the following gave first the experimental value of G [AFMC 1997] |
| A. | Cavendish |
| B. | Copernicus |
| C. | Brook Teylor |
| D. | None of these |
| Answer» B. Copernicus | |
| 4578. |
The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero [RPET 1996] |
| A. | \[\frac{D}{2}\] |
| B. | \[\frac{2D}{3}\] |
| C. | \[\frac{4D}{3}\] |
| D. | \[\frac{9D}{10}\] |
| Answer» E. | |
| 4579. |
The gravitational force between two point masses \[{{m}_{1}}\] and \[{{m}_{2}}\] at separation r is given by \[F=k\frac{{{m}_{1}}{{m}_{2}}}{{{r}^{2}}}\] The constant k [CPMT 1993] |
| A. | Depends on system of units only |
| B. | Depends on medium between masses only |
| C. | Depends on both (a) and (b) |
| D. | Is independent of both (a) and (b) |
| Answer» B. Depends on medium between masses only | |
| 4580. |
Gravitational mass is proportional to gravitational [AIIMS 1998] |
| A. | Field |
| B. | Force |
| C. | Intensity |
| D. | All of these |
| Answer» E. | |
| 4581. |
The tidal waves in the sea are primarily due to |
| A. | The gravitational effect of the moon on the earth |
| B. | The gravitational effect of the sun on the earth |
| C. | The gravitational effect of venus on the earth |
| D. | The atmospheric effect of the earth itself |
| Answer» B. The gravitational effect of the sun on the earth | |
| 4582. |
The earth (mass \[=6\times {{10}^{24}}\,kg)\]) revolves round the sun with angular velocity \[2\times {{10}^{-7}}\,rad/s\] in a circular orbit of radius \[1.5\times {{10}^{8}}\,km\]. The force exerted by the sun on the earth in newtons, is [CBSE PMT 1995; AFMC 1999; Pb. PMT 2003] |
| A. | \[18\times {{10}^{25}}\] |
| B. | Zero |
| C. | \[27\times {{10}^{39}}\] |
| D. | \[36\times {{10}^{21}}\] |
| Answer» E. | |
| 4583. |
When we hear a sound, we can identify its source from [KCET (Med.) 2001] |
| A. | Amplitude of sound |
| B. | Intensity of sound |
| C. | Wavelength of sound |
| D. | Overtones present in the sound |
| Answer» E. | |
| 4584. |
Quality of a musical note depends on [MP PMT 1998; KCET 1999; RPET 2000] |
| A. | Harmonics present |
| B. | Amplitude of the wave |
| C. | Fundamental frequency |
| D. | Velocity of sound in the medium |
| Answer» B. Amplitude of the wave | |
| 4585. |
Decibel is unit of [RPMT 2000] |
| A. | Intensity of light |
| B. | X-rays radiation capacity |
| C. | Sound loudness |
| D. | Energy of radiation |
| Answer» D. Energy of radiation | |
| 4586. |
Intensity level of a sound of intensity I is 30 dB. The ratio \[\frac{I}{{{I}_{0}}}\] is (Where \[{{I}_{0}}\] is the threshold of hearing) [KCET 1999; J & K CET 2005] |
| A. | 3000 |
| B. | 1000 |
| C. | 300 |
| D. | 30 |
| Answer» D. 30 | |
| 4587. |
Two waves having sinusoidal waveforms have different wavelengths and different amplitude. They will be having [BHU 2005] |
| A. | Same pitch and different intensity |
| B. | Same quality and different intensity |
| C. | Different quality and different intensity |
| D. | Same quality and different pitch |
| Answer» B. Same quality and different intensity | |
| 4588. |
Quality depends on [AFMC 2003] |
| A. | Intensity |
| B. | Loudness |
| C. | Timbre |
| D. | Frequency |
| Answer» E. | |
| 4589. |
If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be [CBSE PMT 1992] |
| A. | Increased by a factor of 2 |
| B. | Decreased by a factor of 2 |
| C. | Decreased by a factor of 4 |
| D. | Unchanged |
| Answer» D. Unchanged | |
| 4590. |
A point source emits sound equally in all directions in a non-absorbing medium. Two points \[P\]and \[Q\]are at distances of \[2m\]and \[3m\] respectively from the source. The ratio of the intensities of the waves at \[P\]and \[Q\] is [CBSE PMT 2005] |
| A. | 9 : 4 |
| B. | 2 : 3 |
| C. | 3 : 2 |
| D. | 4 : 9 |
| Answer» B. 2 : 3 | |
| 4591. |
Intensity level 200 cm from a source of sound is 80 dB. If there is no loss of acoustic power in air and intensity of threshold hearing is \[{{10}^{-12}}W{{m}^{-2}}\] then, what is the intensity level at a distance of 400 cm from source |
| A. | Zero |
| B. | 54 dB |
| C. | 64 dB |
| D. | 44 dB |
| Answer» C. 64 dB | |
| 4592. |
Each of the properties of sound listed in column A primarily depends on one of the quantities in column B. Choose the matching pairs from two columns Column A Column B Pitch Waveform Quality Frequency Loudness Intensity [IIT 1980] |
| A. | Pitch-waveform, Quality-frequency; Loudness-intensity |
| B. | Pitch-frequency, Quality-waveform; Loudness-intensity |
| C. | Pitch-intensity, Quality-waveform; Loudness- frequency |
| D. | Pitch-waveform, Quality- intensity; Loudness-frequency |
| Answer» C. Pitch-intensity, Quality-waveform; Loudness- frequency | |
| 4593. |
Learned Indian classical vocalists do not like the accompaniment of a harmonium because [MP PMT 1992] |
| A. | Intensity of the notes of the harmonium is too large |
| B. | Notes of the harmonium are too shrill |
| C. | Diatonic scale is used in the harmonium |
| D. | Tempered scale is used in the harmonium |
| Answer» E. | |
| 4594. |
Tone A has frequency of 240 Hz. Of the following tones, the one which will sound least harmonious with A is |
| A. | 240 |
| B. | 480 |
| C. | 360 |
| D. | 450 |
| Answer» E. | |
| 4595. |
In the musical octave ?Sa?, ?Re?, ?Ga? |
| A. | The frequency of the note ?Sa? is greater than that of ?Re?, ?Ga? |
| B. | The frequency of the note ?Sa? is smaller than that of ?Re?, ?Ga? |
| C. | The frequency of all the notes ?Sa?, ?Re?, ?Ga? is the same |
| D. | The frequency decreases in the sequence ?Sa?, ?Re?, ?Ga? |
| Answer» C. The frequency of all the notes ?Sa?, ?Re?, ?Ga? is the same | |
| 4596. |
Of the following the one which emits sound of higher pitch is |
| A. | Mosquito |
| B. | Lion |
| C. | Man |
| D. | Woman |
| Answer» B. Lion | |
| 4597. |
It is possible to recognise a person by hearing his voice even if he is hidden behind a wall. This is due to the fact that his voice [CPMT 1972] |
| A. | Has a definite pitch |
| B. | Has a definite quality |
| C. | Has a definite loudness |
| D. | Can penetrate the wall |
| Answer» C. Has a definite loudness | |
| 4598. |
The intensity level due to two waves of the same frequency in a given medium are 1 bel and 5 bel. Then the ratio of amplitudes is |
| A. | 1 : 4 |
| B. | 1 : 2 |
| C. | 1 : 104 |
| D. | 1 : 102 |
| Answer» E. | |
| 4599. |
In an orchestra, the musical sounds of different instruments are distinguished from one another by which of the following characteristics [CBSE PMT 1993] |
| A. | Pitch |
| B. | Loudness |
| C. | Quality |
| D. | Overtones |
| Answer» D. Overtones | |
| 4600. |
If the pressure amplitude in a sound wave is tripled, then the intensity of sound is increased by a factor of [CPMT 1992; JIPMER 2000] |
| A. | 9 |
| B. | 3 |
| C. | 6 |
| D. | \[\sqrt{3}\] |
| Answer» B. 3 | |