Jee Neet QnA - Recent questions in Physics
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Powered by Question2AnswerA series LCR circuit containing 5.0 H inductor, 80 µF capacitor and 40 Ω resistor is connected to 230 V variable
https://jeeneetqna.in/2133/containing-inductor-capacitor-resistor-connected-variable
A series LCR circuit containing 5.0 H inductor, 80 µF capacitor and 40 Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be:<br />
<br />
(1) 42 rad/s and 58 rad/s<br />
<br />
(2) 25 rad/s and 75 rad/s<br />
<br />
(3) 50 rad/s and 25 rad/s<br />
<br />
(4) 46 rad/s and 54 rad/sElectromagnetic Induction and Alternating Currentshttps://jeeneetqna.in/2133/containing-inductor-capacitor-resistor-connected-variableTue, 14 Sep 2021 12:10:06 +0000A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height.
https://jeeneetqna.in/2132/ball-dropped-from-height-strikes-ground-rebounds-same-height
<p>A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is (g = 10 m/s<sup>2</sup>) nearly :</p><p>(1) 1.4 kg m/s</p><p>(2) 0 kg m/s</p><p>(3) 4.2 kg m/s</p><p>(4) 2.1 kg m/s.</p>Laws of Motionhttps://jeeneetqna.in/2132/ball-dropped-from-height-strikes-ground-rebounds-same-heightTue, 14 Sep 2021 12:05:07 +0000A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp.
https://jeeneetqna.in/2131/down-transformer-connected-mains-supply-made-operate-lamp
A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44 W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit?<br />
<br />
(1) 4 A<br />
<br />
(2) 0.2 A<br />
<br />
(3) 0.4 A<br />
<br />
(4) 2 AElectromagnetic Induction and Alternating Currentshttps://jeeneetqna.in/2131/down-transformer-connected-mains-supply-made-operate-lampTue, 14 Sep 2021 12:02:14 +0000Twenty seven drops of same size are charged at 220 V each. They combine to form a bigger drop.
https://jeeneetqna.in/2130/twenty-seven-drops-charged-each-they-combine-form-bigger-drop
Twenty seven drops of same size are charged at 220 V each. They combine to form a bigger drop. Calculate the potential of the bigger drop.<br />
<br />
(1) 1980 V<br />
<br />
(2) 660 V<br />
<br />
(3) 1320 V<br />
<br />
(4) 1520 VElectrostaticshttps://jeeneetqna.in/2130/twenty-seven-drops-charged-each-they-combine-form-bigger-dropTue, 14 Sep 2021 11:59:09 +0000Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are
https://jeeneetqna.in/2129/water-falls-height-operate-turbine-losses-frictional-force
<p>Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine?</p><p>(g = 10 m/s<sup>2</sup>)</p><p>(1) 7.0 kW</p><p>(2) 10.2 kW</p><p>(3) 8.1 kW</p><p>(4) 12.3 kW</p>Work, Energy and Powerhttps://jeeneetqna.in/2129/water-falls-height-operate-turbine-losses-frictional-forceTue, 14 Sep 2021 11:56:11 +0000A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended
https://jeeneetqna.in/2128/spring-stretched-force-period-oscillations-mass-suspended
A spring is stretched by 5 cm by a force 10 N. The time period of the oscillations when a mass of 2 kg is suspended by it is:<br />
<br />
(1) 0.628 s<br />
<br />
(2) 0.0628 s<br />
<br />
(3) 6.28 s<br />
<br />
(4) 3.14 sLaws of Motionhttps://jeeneetqna.in/2128/spring-stretched-force-period-oscillations-mass-suspendedTue, 14 Sep 2021 11:50:21 +0000In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V
https://jeeneetqna.in/2127/potentiometer-circuit-gives-balance-point-length-another
In a potentiometer circuit a cell of EMF 1.5 V gives balance point at 36 cm length of wire. If another cell of EMF 2.5 V replaces the first cell, then at what length of the wire, the balance point occurs ?<br />
<br />
(1) 62 cm<br />
<br />
(2) 60 cm<br />
<br />
(3) 21.6 cm<br />
<br />
(4) 64 cmCurrent Electricityhttps://jeeneetqna.in/2127/potentiometer-circuit-gives-balance-point-length-anotherTue, 14 Sep 2021 11:48:29 +0000If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of
https://jeeneetqna.in/2126/acceleration-fundamental-physical-quantities-dimensions
<p>If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities. Find the dimensions of energy.</p><p>(1) [F] [A<sup>-1</sup>] [T]</p><p>(2) [F] [A] [T]</p><p>(3) [F] [A] [T<sup>2</sup>]</p><p>(4) [F] [A] [T<sup>-1</sup>]</p>Physics and Measurementhttps://jeeneetqna.in/2126/acceleration-fundamental-physical-quantities-dimensionsTue, 14 Sep 2021 11:46:00 +0000The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm
https://jeeneetqna.in/2125/photons-second-average-emitted-monochromatic-wavelength
<p>The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nm, when it delivers the power of 3.3 x 10<sup>-3</sup> watt will be: (h=6.6 × 10<sup>-34</sup> Js)</p><p>(1) 10<sup>15</sup></p><p>(2) 10<sup>16</sup></p><p>(3) 10<sup>17</sup></p><p>(4) 10<sup>18</sup></p>Dual Nature of Matter and Radiationhttps://jeeneetqna.in/2125/photons-second-average-emitted-monochromatic-wavelengthTue, 14 Sep 2021 11:42:46 +0000The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor.
https://jeeneetqna.in/2124/concentration-semiconductor-concentration-semiconductor
The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.<br />
<br />
(1) No current will flow in p-type, current will only flow in n-type.<br />
<br />
(2) current in n-type = current in p-type.<br />
<br />
(3) current in p-type > current in n-type.<br />
<br />
(4) current in n-type > current in p-type.Electronic Deviceshttps://jeeneetqna.in/2124/concentration-semiconductor-concentration-semiconductorTue, 14 Sep 2021 11:39:01 +0000A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon
https://jeeneetqna.in/2123/nucleus-number-breaks-fragments-number-binding-energy-nucleon
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the Binding Energy in the process is :<br />
<br />
(1) 216 MeV<br />
<br />
(2) 0.9 MeV<br />
<br />
(3) 9.4 MeV<br />
<br />
(4) 804 MeVAtoms and Nucleihttps://jeeneetqna.in/2123/nucleus-number-breaks-fragments-number-binding-energy-nucleonTue, 14 Sep 2021 11:36:49 +0000The effective resistance of a parallel connection that consists of four wires of equal length
https://jeeneetqna.in/2122/effective-resistance-parallel-connection-consists-length
The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 2. What will be the effective resistance if they are connected in series?<br />
<br />
(1) 4 Ω<br />
<br />
(2) 0.25 Ω<br />
<br />
(3) 0.5 Ω<br />
<br />
(4) 1 ΩCurrent Electricityhttps://jeeneetqna.in/2122/effective-resistance-parallel-connection-consists-lengthTue, 14 Sep 2021 11:34:39 +0000A screw gauge gives the following readings when used to measure the diameter of a wire Main scale reading: 0 mm
https://jeeneetqna.in/2121/screw-gauge-gives-following-readings-measure-diameter-reading
A screw gauge gives the following readings when used to measure the diameter of a wire<br />
<br />
Main scale reading: 0 mm<br />
<br />
Circular scale reading: 52 divisions<br />
<br />
Given that 1 mm on main scale corresponds to 100 divisions on the circular scale. The diameter of the wire from the above data is :<br />
<br />
(1) 0.052 cm<br />
<br />
(2) 0.52 cm<br />
<br />
(3) 0.026 cm<br />
<br />
(4) 0.26 cmPhysics and Measurementhttps://jeeneetqna.in/2121/screw-gauge-gives-following-readings-measure-diameter-readingTue, 14 Sep 2021 11:27:32 +0000The escape velocity from the Earth's surface is υ. The escape velocity from the surface of another planet having
https://jeeneetqna.in/2120/velocity-earths-surface-velocity-surface-another-planet-having
The escape velocity from the Earth's surface is υ. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is:<br />
<br />
(1) 4 υ<br />
<br />
(2) υ<br />
<br />
(3) 2 υ<br />
<br />
(4) 3 υGravitationhttps://jeeneetqna.in/2120/velocity-earths-surface-velocity-surface-another-planet-havingTue, 14 Sep 2021 11:23:48 +0000A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis
https://jeeneetqna.in/2119/convex-focal-length-concave-focal-length-kept-along-same-axis
A convex lens 'A' of focal length 20 cm and a concave lens 'B' of focal length 5 cm are kept along the same axis with a distance 'd' between them. If a parallel beam of light falling on 'A' leaves 'B' as a parallel beam, then the distance 'd' in cm will be:<br />
<br />
(1) 30<br />
<br />
(2) 25<br />
<br />
(3) 15<br />
<br />
(4) 50Ray Optics and Optical Instrumentshttps://jeeneetqna.in/2119/convex-focal-length-concave-focal-length-kept-along-same-axisTue, 14 Sep 2021 11:21:03 +0000Consider the following statements (A) and (B) and identify the correct answer. (A) A zener diode is connected in reverse
https://jeeneetqna.in/2118/consider-following-statements-identify-correct-connected
<p>Consider the following <strong>statements (A)</strong> and <strong>(B)</strong> and identify the <strong>correct</strong> answer.</p><p><strong>(A)</strong> A zener diode is connected in reverse bias, when used as a voltage regulator.</p><p><strong>(B)</strong> The potential barrier of p-n junction lies between 0.1 V to 0.3 V.</p><p>(1) <strong>(A)</strong> and <strong>(B)</strong> both are correct.</p><p>(2) <strong>(A)</strong> and <strong>(B)</strong> both are incorrect.</p><p>(3) <strong>(A)</strong> is correct and <strong>(B)</strong> is incorrect.</p><p>(4) <strong>(A)</strong> is incorrect but <strong>(B)</strong> is correct.</p>Electrostaticshttps://jeeneetqna.in/2118/consider-following-statements-identify-correct-connectedTue, 14 Sep 2021 11:15:56 +0000A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:
https://jeeneetqna.in/2117/length-aperture-suited-objective-astronomical-telescope
A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since:<br />
<br />
(1) a large aperture contributes to the quality and visibility of the images.<br />
<br />
(2) a large area of the objective ensures better light gathering power.<br />
<br />
(3) a large aperture provides a better resolution.<br />
<br />
(4) all of the above.Ray Optics and Optical Instrumentshttps://jeeneetqna.in/2117/length-aperture-suited-objective-astronomical-telescopeTue, 14 Sep 2021 11:04:50 +0000Polar molecules are the molecules :
https://jeeneetqna.in/2116/polar-molecules-are-the-molecules
Polar molecules are the molecules :<br />
<br />
(1) having zero dipole moment.<br />
<br />
(2) having permanent electric dipole moment.<br />
<br />
(3) acquire a dipole moment only when magnetic field is absent.<br />
<br />
(4) acquire a dipole moment only in the presence of electric field due to displacement of charges.Electrostaticshttps://jeeneetqna.in/2116/polar-molecules-are-the-moleculesTue, 14 Sep 2021 10:59:19 +0000A body is executing simple harmonic motion with a frequency 'n', the frequency of its potential energy is :
https://jeeneetqna.in/2115/executing-harmonic-frequency-frequency-potential-energy
A body is executing simple harmonic motion with a frequency 'n', the frequency of its potential energy is :<br />
<br />
(1) n<br />
<br />
(2) 2n<br />
<br />
(3) 3n<br />
<br />
(4) 4nOscillations and Waveshttps://jeeneetqna.in/2115/executing-harmonic-frequency-frequency-potential-energyTue, 14 Sep 2021 10:50:41 +0000what is average velocity of parti in one complete vibrationcle executing SHM
https://jeeneetqna.in/2098/what-average-velocity-parti-complete-vibrationcle-executing
neet 2019 simple harmonic motionRotational Motionhttps://jeeneetqna.in/2098/what-average-velocity-parti-complete-vibrationcle-executingSat, 28 Aug 2021 09:34:45 +0000If W = work done, T = Temperature, KB = Boltzmann constant, x = Displacement & W = αβ^2 e x^2/αKBT
https://jeeneetqna.in/2062/work-done-temperature-boltzmann-constant-displacement-kbt
<p>If W = work done, T = Temperature, K<sub>B</sub> = Boltzmann constant, x = Displacement & $W=\alpha\beta^2e^{x^2\over\alpha K_BT}$, then find dimensions of β?</p><p>(a) [M<sup>1</sup>L<sup>2</sup>T<sup>−2</sup>]</p><p>(b) [M<sup>−1</sup>L<sup>2</sup>T<sup>−2</sup>]</p><p>(c) [M<sup>1</sup>L<sup>1</sup>T<sup>−2</sup>]</p><p>(d) None of these</p>Physics and Measurementhttps://jeeneetqna.in/2062/work-done-temperature-boltzmann-constant-displacement-kbtMon, 26 Jul 2021 18:23:05 +0000A travelling wave is given by y = −0.21sin(x+ 3t) where x is in m, t is in seconds, y is in mm.
https://jeeneetqna.in/2061/travelling-wave-given-0-21sin-3t-where-is-in-in-seconds-is-mm
A travelling wave is given by y = −0.21sin(x+ 3t) where x is in m, t is in seconds, y is in mm. (mass per unit length = 0.135 g/cm). Find the tension in the wire.<br />
<br />
(a) T = 0.1215 N<br />
<br />
(b) T = 20 N<br />
<br />
(c) T = 15.35 N<br />
<br />
(d) T = 5 NOscillations and Waveshttps://jeeneetqna.in/2061/travelling-wave-given-0-21sin-3t-where-is-in-in-seconds-is-mmMon, 26 Jul 2021 18:15:49 +0000If the force acting on the body moving in circular motion is proportional to r−3, then the time period
https://jeeneetqna.in/2060/force-acting-body-moving-circular-motion-proportional-period
<p>If the force acting on the body moving in circular motion is proportional to r<sup>−3</sup>, then the time period of its revolution is proportional to</p><p>(a) $1\over r$</p><p>(b) $1\over r^2$</p><p>(c) r<sup>2</sup></p><p>(d) r</p>Oscillations and Waveshttps://jeeneetqna.in/2060/force-acting-body-moving-circular-motion-proportional-periodMon, 26 Jul 2021 18:12:11 +0000Some drops, each of radius ‘r’ coalesce to form a large drop of radius ‘R’. The surface tension is T.
https://jeeneetqna.in/2059/some-drops-radius-coalesce-large-drop-radius-surface-tension
Some drops, each of radius ‘r’ coalesce to form a large drop of radius ‘R’. The surface tension is T. Find the change in surface energy per unit volume.<br />
<br />
(a) $T\left({1\over r}-{1\over R}\right)$<br />
<br />
(b) $3T\left({1\over r}-{1\over R}\right)$<br />
<br />
(c) $3T\left({1\over R}-{1\over r}\right)$<br />
<br />
(d) $T\left({1\over R}-{1\over r}\right)$Properties of Solids and Liquidshttps://jeeneetqna.in/2059/some-drops-radius-coalesce-large-drop-radius-surface-tensionMon, 26 Jul 2021 18:09:14 +0000An AC current is given by i(t) = I1 sin wt + I2 cos wt. Find the rms value of current.
https://jeeneetqna.in/2058/an-ac-current-given-sin-i2-cos-wt-find-the-rms-value-of-current
An AC current is given by $i(t)=I_1\sin wt+I_2\cos wt$. Find the rms value of current.<br />
<br />
(a) $i_{rms}={\sqrt{I_1^2+I_2^2}\over2}$<br />
<br />
(b) $i_{rms}={\sqrt{I_1^2+I_2^2\over2}}$<br />
<br />
(c) $i_{rms}={I_1^2+I_2^2\over2}$<br />
<br />
(d) $i_{rms}=2\left(\sqrt{I_1^2+I_2^2}\right)$Electromagnetic Induction and Alternating Currentshttps://jeeneetqna.in/2058/an-ac-current-given-sin-i2-cos-wt-find-the-rms-value-of-currentMon, 26 Jul 2021 18:04:53 +0000Four solid spheres each of mass m and radius a, have their centers on the vertices of a square whose side is b.
https://jeeneetqna.in/2057/solid-spheres-radius-their-centers-vertices-square-whose-side
Four solid spheres each of mass m and radius a, have their centers on the vertices of a square whose side is b. Find moment of inertia about the given axis?<br />
<br />
(Assume spheres are connected using a light frame)<br />
<br />
(a) $m\left({8a^2\over5}+2b^2\right)$<br />
<br />
(b) $m\left({8a^2\over5}+4b^2\right)$<br />
<br />
(c) $m\left({4a^2\over5}+2b^2\right)$<br />
<br />
(d) $m\left({4a^2\over5}+b^2\right)$Rotational Motionhttps://jeeneetqna.in/2057/solid-spheres-radius-their-centers-vertices-square-whose-sideMon, 26 Jul 2021 14:28:43 +0000Find the significant figure in 50000.020 × 10^-3
https://jeeneetqna.in/2056/find-the-significant-figure-in-50000-020-10-3
<p>Find the significant figure in 50000.020 × 10<sup>-3</sup></p><p>(a) 5</p><p>(b) 6</p><p>(c) 7</p><p>(d) 8</p>Physics and Measurementhttps://jeeneetqna.in/2056/find-the-significant-figure-in-50000-020-10-3Mon, 26 Jul 2021 14:05:15 +0000In x-ray tube experiment accelerating voltage is given by 1.24 M volt. Find out the wavelength.
https://jeeneetqna.in/1839/tube-experiment-accelerating-voltage-given-volt-wavelength
<p>In x-ray tube experiment accelerating voltage is given by 1.24 M volt. Find out the wavelength.</p><p>(1) 10<sup>–3</sup> nm</p><p>(2) 10<sup>–2</sup> nm</p><p>(3) 10<sup>–4</sup> nm</p><p>(4) 10<sup>–5</sup> nm</p>Atoms and Nucleihttps://jeeneetqna.in/1839/tube-experiment-accelerating-voltage-given-volt-wavelengthSat, 22 May 2021 15:54:08 +0000Which of the following represent travelling wave?
https://jeeneetqna.in/1838/which-of-the-following-represent-travelling-wave
<p>Which of the following represent travelling wave?</p><p>(1) y = A sin (15 t – 2x)</p><p>(2) y = A cos (15 t) sin 2x</p><p>(3) y = A sin (15 t) cos 2x</p><p>(4) y = A e<sup>–x</sup> cos (15 t – 2x)</p>Oscillations and Waveshttps://jeeneetqna.in/1838/which-of-the-following-represent-travelling-waveSat, 22 May 2021 15:51:11 +0000If the de-Broglie wavelengths of α-particle and proton are equal then the ratio of their velocities are
https://jeeneetqna.in/1837/broglie-wavelengths-particle-proton-equal-their-velocities
If the de-Broglie wavelengths of $\alpha$-particle and proton are equal then the ratio of their velocities are<br />
<br />
(1) $1\over4$<br />
<br />
(2) $4\over1$<br />
<br />
(3) $1\over2$<br />
<br />
(4) 1Dual Nature of Matter and Radiationhttps://jeeneetqna.in/1837/broglie-wavelengths-particle-proton-equal-their-velocitiesSat, 22 May 2021 15:49:23 +0000A body is projected from origin with a velocity v0 along +ve x-axis on which a force –αx^2 is acting on it.
https://jeeneetqna.in/1836/projected-from-origin-velocity-along-axis-which-force-acting
<p>A body is projected from origin with a velocity v<sub>0</sub> along +ve x-axis on which a force $–\alpha x^2$ is acting on it. Find the maximum distance from origin up to which the body can go. (x is the position of particle).</p><p>(1) $\left({3mv_0^2\over2\alpha}\right)^{1\over3}$</p><p>(2) $\left({3mv_0^2\over2\alpha}\right)^{1\over2}$</p><p>(3) $\left({2mv_0^2\over3\alpha}\right)^{1\over3}$</p><p>(4) $\left({2mv_0^2\over3\alpha}\right)^{1\over2}$</p>Work, Energy and Powerhttps://jeeneetqna.in/1836/projected-from-origin-velocity-along-axis-which-force-actingSat, 22 May 2021 15:45:15 +0000Disc of radius a/2 is cut from disc of radius a. Find x-co-ordinate of COM from origin.
https://jeeneetqna.in/1835/disc-radius-cut-from-disc-radius-find-ordinate-com-from-origin
<p>Disc of radius $a\over2$ is cut from disc of radius a. Find x-co-ordinate of COM from origin.</p><p style="text-align:center"><img alt="Disc of radius a/2 is cut from disc of radius a. Find x-co-ordinate of COM from origin." src="https://jeeneetqna.in/?qa=blob&qa_blobid=3501732029027055656" style="height:193px; width:312px"></p><p>(1) $5a\over6$</p><p>(2) $a\over6$</p><p>(3) $a\over3$</p><p>(4) $a\over2$</p>Rotational Motionhttps://jeeneetqna.in/1835/disc-radius-cut-from-disc-radius-find-ordinate-com-from-originSat, 22 May 2021 15:38:51 +0000Which of the following curve represents relation between velocity with displacement of particle performing shm
https://jeeneetqna.in/1834/following-represents-relation-velocity-displacement-performing
Which of the following curve represents relation between velocity with displacement of particle performing simple harmonic motion<br />
<br />
(1) ellipe <br />
<br />
(2) circle <br />
<br />
(3) hyperbola <br />
<br />
(4) straight lineOscillations and Waveshttps://jeeneetqna.in/1834/following-represents-relation-velocity-displacement-performingSat, 22 May 2021 15:26:09 +0000If soft iron (ferromagnetic substance) is placed in external uniform magnetic field.
https://jeeneetqna.in/1833/ferromagnetic-substance-placed-external-uniform-magnetic
If soft iron (ferromagnetic substance) is placed in external uniform magnetic field.<br />
<br />
(1) Size of domain will change and orientation also change.<br />
<br />
(2) Size of domain will increase<br />
<br />
(3) Size of domain will decrease<br />
<br />
(4) Does not depend on external magnetic field.Magnetic Effects of Current and Magnetismhttps://jeeneetqna.in/1833/ferromagnetic-substance-placed-external-uniform-magneticSat, 22 May 2021 15:24:07 +0000For which of the following transitions in Hydrogen-like atom of the frequency of emitted photon will be maximum
https://jeeneetqna.in/1832/following-transitions-hydrogen-frequency-emitted-maximum
For which of the following transitions in Hydrogen-like atom of the frequency of emitted photon will be maximum<br />
<br />
(1) n = 2 to n = 1<br />
<br />
(2) n = 4 to n = 3<br />
<br />
(3) n = 5 to n = 4<br />
<br />
(4) n = 3 to n = 2Atoms and Nucleihttps://jeeneetqna.in/1832/following-transitions-hydrogen-frequency-emitted-maximumSat, 22 May 2021 15:23:12 +0000A light source emitting light and if we change light from violet to red then
https://jeeneetqna.in/1831/light-source-emitting-light-and-change-light-from-violet-then
A light source emitting light and if we change light from violet to red then<br />
<br />
(1) Fringes become dark<br />
<br />
(2) The separation between two consecutive fringes decreases<br />
<br />
(3) Intensity of central maxima will increase<br />
<br />
(4) Intensity of central maxima will decreaseWave Opticshttps://jeeneetqna.in/1831/light-source-emitting-light-and-change-light-from-violet-thenSat, 22 May 2021 15:21:40 +0000Weight at pole is 49 Newton then weight at equator?
https://jeeneetqna.in/1830/weight-at-pole-is-49-newton-then-weight-at-equator
Weight at pole is 49 Newton then weight at equator?<br />
<br />
(1) 48.83 N<br />
<br />
(2) 49.17 N<br />
<br />
(3) 49.83 N<br />
<br />
(4) 49 NGravitationhttps://jeeneetqna.in/1830/weight-at-pole-is-49-newton-then-weight-at-equatorSat, 22 May 2021 15:18:11 +0000Which of the following is correct for Zener diode
https://jeeneetqna.in/1829/which-of-the-following-is-correct-for-zener-diode
Which of the following is correct for Zener diode<br />
<br />
(1) Lightly dopped, depletion layer thickness is less<br />
<br />
(2) Heavily dopped, depletion layer thickness is less<br />
<br />
(3) Lightly dopped, depletion layer thickness is more<br />
<br />
(4) Heavily dopped, depletion layer thickness is more.Electronic Deviceshttps://jeeneetqna.in/1829/which-of-the-following-is-correct-for-zener-diodeSat, 22 May 2021 15:00:51 +0000Current I is flowing in a coil and two points B1 and B2 are on the axis of coil at a distance 0.05 m and 0.2 meter
https://jeeneetqna.in/1777/current-flowing-coil-and-two-points-axis-coil-distance-meter
<p>Current I is flowing in a coil and two points B<sub>1</sub> and B<sub>2</sub> are on the axis of coil at a distance 0.05 m and 0.2 meter respectively. If ratio of magnetic field at point B<sub>1</sub> and B<sub>2</sub> are in 8 : 1, then find radius of coil.</p><p>(1) 0.1 m </p><p>(2) 0.2 m </p><p>(3) 0.7 m </p><p>(4) 0.8 m</p>Magnetic Effects of Current and Magnetismhttps://jeeneetqna.in/1777/current-flowing-coil-and-two-points-axis-coil-distance-meterTue, 13 Apr 2021 12:48:07 +0000A screw gauge shows 8 division on circular scale below reference line when no object is placed. Number of division on
https://jeeneetqna.in/1776/division-circular-reference-object-placed-number-division
A screw gauge shows 8 division on circular scale below reference line when no object is placed. Number of division on circular scale is 100 and in one complete rotation it advanced by 1mm when a copper wire is measured with it, it complete one rotation and 72 division on circular scale. Find radius of copper wire.<br />
<br />
(1) 1.80 mm <br />
<br />
(2) 0.90 mm <br />
<br />
(3) 0.82 mm <br />
<br />
(4) 1.64 mmPhysics and Measurementhttps://jeeneetqna.in/1776/division-circular-reference-object-placed-number-divisionTue, 13 Apr 2021 12:45:12 +0000A sphere of mass M has gravitational field at point P is g1. Now volume cavity of radius R is removed as shown.
https://jeeneetqna.in/1775/sphere-gravitational-field-volume-cavity-radius-removed-shown
<p>A sphere of mass M has gravitational field at point P is g<sub>1</sub>. Now volume cavity of radius R is removed as shown. New gravitational field is g<sub>2</sub>. Find $\left({g_1\over g_2}\right)$?</p><p style="text-align:center"><img alt="" src="https://jeeneetqna.in/?qa=blob&qa_blobid=8722733352918370131" style="height:187px; width:275px"></p><p>(1) $41\over50$</p><p>(2) $50\over41$</p><p>(3) $41\over42$</p><p>(4) $40\over41$</p>Gravitationhttps://jeeneetqna.in/1775/sphere-gravitational-field-volume-cavity-radius-removed-shownTue, 13 Apr 2021 12:42:25 +0000For an extrinsic semiconductor if doping concentration is increases then.
https://jeeneetqna.in/1748/extrinsic-semiconductor-doping-concentration-increases
<p>For an extrinsic semiconductor if doping concentration is increases then.</p><p>(1) For N-type and P-type fermi level will increase if T > T<sub>f</sub> (T = temp of semi-conductor, T<sub>f</sub> = fermi Temp.)</p><p>(2) For N-type fermi level will increase and for P-type fermi level will decrease.</p><p>(3) For N-type fermi level will decrease and for P-type fermi level will increase.</p><p>(4) For N-type fermi level will decrease and for P-type fermi level will decrease.</p>Electronic Deviceshttps://jeeneetqna.in/1748/extrinsic-semiconductor-doping-concentration-increasesSat, 10 Apr 2021 08:25:27 +0000A train passes by a pole with uniform acceleration ‘a’. Its front end when passes by it has speed ‘u’ and its back end
https://jeeneetqna.in/1740/train-passes-uniform-acceleration-front-passes-speed-back
A train passes by a pole with uniform acceleration ‘a’. Its front end when passes by it has speed ‘u’ and its back end when passes by it has speed ‘v’. Find speed of the middle part when it passes by the pole?<br />
<br />
(1) $\sqrt{v^2+u^2}\over2$<br />
<br />
(2) $\sqrt{v^2+u^2\over2}$<br />
<br />
(3) $\sqrt{v^2-u^2\over2}$<br />
<br />
(4) $\sqrt{v^2-u^2}\over2$Kinematicshttps://jeeneetqna.in/1740/train-passes-uniform-acceleration-front-passes-speed-backWed, 07 Apr 2021 11:52:11 +0000Time period of simple pendulum at a planet is 2 sec. Length of simple pendulum is 2 meter. Find the value of g
https://jeeneetqna.in/1739/period-simple-pendulum-planet-length-simple-pendulum-value
<p>Time period of simple pendulum at a planet is 2 sec. Length of simple pendulum is 2 meter. Find the value of g at that planet (in m/s<sup>2</sup>)</p><p>(1) 2$\pi$<sup>2</sup></p><p>(2) 9.8 m/s<sup>2</sup></p><p>(3) 10 m/s<sup>2</sup></p><p>(4) $\pi^2\over2$m/s<sup>2</sup></p>Gravitationhttps://jeeneetqna.in/1739/period-simple-pendulum-planet-length-simple-pendulum-valueWed, 07 Apr 2021 10:21:36 +0000Two particles having mass M1 = 4 gm, M2 = 16 gm. If kinetic energy of both the particle is equal then ratio of their
https://jeeneetqna.in/1738/particles-having-kinetic-energy-particle-equal-ratio-their
<p>Two particles having mass M<sub>1</sub> = 4 gm, M<sub>2</sub> = 16 gm. If kinetic energy of both the particle is equal then ratio of their momentum is n : 2 then n is:</p><p>(1) 2 </p><p>(2) 1/2 </p><p>(3) 4 </p><p>(4) 1/4</p>Rotational Motionhttps://jeeneetqna.in/1738/particles-having-kinetic-energy-particle-equal-ratio-theirWed, 07 Apr 2021 07:40:23 +0000In photoelectric effect of a certain metal the stopping potential is 0.71 V if the wavelength of incident radiation is
https://jeeneetqna.in/1737/photoelectric-stopping-potential-wavelength-incident-radiation
In photoelectric effect of a certain metal the stopping potential is 0.71 V if the wavelength of incident radiation is 491 nm. Now the stopping potential comes out to be 1.43 V if the wavelength of incident radiation is:<br />
<br />
(1) 390 nm<br />
<br />
(2) 382 nm<br />
<br />
(3) 275 nm<br />
<br />
(4) 392 nmDual Nature of Matter and Radiationhttps://jeeneetqna.in/1737/photoelectric-stopping-potential-wavelength-incident-radiationWed, 07 Apr 2021 07:36:59 +0000If an electron of a hydrogen atom jumps from n = 2 to n = 1 then find the wavelength of released photon.
https://jeeneetqna.in/1736/electron-hydrogen-atom-jumps-then-wavelength-released-photon
If an electron of a hydrogen atom jumps from n = 2 to n = 1 then find the wavelength of released photon.<br />
<br />
(1) 121.5 nm<br />
<br />
(2) 123.15 nm<br />
<br />
(3) 125.15 nm<br />
<br />
(4) 128.15 nmAtoms and Nucleihttps://jeeneetqna.in/1736/electron-hydrogen-atom-jumps-then-wavelength-released-photonWed, 07 Apr 2021 07:35:06 +0000Statement-1: Rotational KE of a gas molecule follows Maxwell's speed distribution curve. Statement-2: Rotational KE
https://jeeneetqna.in/1735/statement-rotational-distribution-statement-rotational
<p><strong>Statement-1:</strong> Rotational KE of a gas molecule follows Maxwell's speed distribution curve.</p><p><strong>Statement-2:</strong> Rotational KE & translational KE of a diatomic gas molecule is same.</p><p>(1) 1-true 2-false </p><p>(2) 1-false 2-true</p><p>(3) 1-false 2-false </p><p>(4) 1-true 2-true</p>Kinetic Theory of Gaseshttps://jeeneetqna.in/1735/statement-rotational-distribution-statement-rotationalWed, 07 Apr 2021 07:33:39 +0000If the current flowing in a coil is reduced to half of its original value, the relaticn between the new energy
https://jeeneetqna.in/1732/current-flowing-reduced-original-relaticn-between-energy
<p>If the current flowing in a coil is reduced to half of its original value, the relaticn between the new energy (E<sub>2</sub>) and the original energy (E<sub>1</sub>) stored in the coil will be</p><p>(A) E<sub>2</sub> = E<sub>1</sub></p><p>(B) E<sub>2</sub> = 2E<sub>1</sub></p><p>(C) E<sub>2</sub> = $1\over2$E<sub>1</sub></p><p>(D) E<sub>2</sub> = $1\over4$E<sub>1</sub></p>Electromagnetic Waveshttps://jeeneetqna.in/1732/current-flowing-reduced-original-relaticn-between-energySun, 04 Apr 2021 05:35:14 +0000In a given AC series circuit containing elements R, L and C & source voltage = 220v, it is known that if L alone is
https://jeeneetqna.in/1722/given-series-circuit-containing-elements-source-voltage-alone
<p>In a given AC series circuit containing elements R, L and C & source voltage = 220v, it is known that if L alone is removed or if C alone is removed, phase difference between current & voltage remains 45°. Find i<sub>RMS</sub> ? (R = 110 $\Omega$)</p><p>(1) 2A </p><p>(2) 2.5A </p><p>(3) 1A </p><p>(4) 1.5A</p>Electromagnetic Induction and Alternating Currentshttps://jeeneetqna.in/1722/given-series-circuit-containing-elements-source-voltage-aloneThu, 01 Apr 2021 12:56:54 +0000