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SECTION – I (Multiple Correct Answer Type) This section contains 8 multiple choice questions. Each question has 4 options (A), (B), (C) and (D) for its answer, out of which ONE OR MORE than ONE option can be correct. Marking scheme: +4 for all correct options & +1 partial marks, 0 if not attempted and –2 in all wrong cases. 1. Two non – collinear forces of equal magnitude and oppositely directed are acting on a body. Which of the following statements is/are correct? A) The resultant torque of the two forces about any point in the plane of the forces is same B) The resultant torque of the two forces about any axis in the plane of the forces is same C) The resultant torque of the two forces about any point in space is same D) The resultant torque of the two forces about any axis in space is same 2. The figure shows electronic wave function for a hydrogen atom. A) The quantum number of this state is 6 B) The wavelength of this electron is 6r 0 . (r 0 is radius of ground state) C) Can go to ground state by emitting 3 different photons D) On de excitation it emits atleast one line in infrared region of spectrum. 3. A charged particle enters into a region which offers a resis- tance against its motion and a uni- form magnetic field exists in the region. The particle traces a spiral path as shown in figure. Which of the following state- ment(s) is/are correct? A) Component of magnetic field in the plane of spiral is zero B) The particle enters the region at Q C) If magnetic field is outward, then the particle is positively charged D) If magnetic field is outward, then the particle is negatively charged 4. An infinitely long current carrying thick cylindrical conductor of radius R has a R cylindrical cavity of radius . The axis of 2 R the cylindrical cavity is at a distance 2 from the axis of the cylindrical conductor. A cur- rent with current density J flows along the length of the conductor. The magnetic field at a point ‘P’ at a distance 2R from the axis of the cylinder is (point ‘P’ is on the plane containing both the axes) 0 JR A) Magnetic field at P is 12 0 JR B) Magnetic field at P is 6 C) Magnetic field on the axis of the cavity is non – zero D) Magnetic field on the axis of the conductor is non – zero 5. Two different coils have self inductance 8mH and 2mH. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same constant. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are I 1 , V 1 and W 1 respectively. Corresponding values for the second coil at the same instant are I 2 , V 2 and W 2 respectively. Then: I 1 1 I 1 A) = B) = 4 I 2 4 I 2 W 2 V 2 1 C) = 2 D) = W 1 V 1 4 6. In figure shown, the spring constant is k, the mass of the upper block is m and that of the lower block is 3 m. The upper block is depressed down from its equilibrium position by a dis- tance and released at t = 0. Which of the following are correct? A) If = 5 mg/k, then the lower block losses constant with the ground B) If = 7 mg/k, then the lower block losses constant with the ground C) If = 7 mg/2k, then the minimum normal reaction on 3 m from ground is less than mg 15 mg D) If = , then the minimum normal 4 k reaction on 3 m from ground is less than mg 7. A thin uniform rod is supported by a vertical string and by a hinge H is at equilibrium as shown in figure. In space gravity varies as x g = g 0 ( 1 + ) ( j ) m/s 2 . Vessel is L completely filled with water. Density of material of rod is two times the density of water. ‘L’ is the length of rod. Rod is free to rotate about the hinge ‘H’. Mass of rod ‘m’ kg. mg 0 A) Initially tension in string is 2 5 B) Initially tension in string is mg 0 12 C) Just after cutting string angular 5g 0 accelerating of rod is 4L D) Just after cutting string angular g 0 accelerating of rod is 2L SECTION - II (Integer Answer Type) This section contains 5 questions. The answer is a single digit integer ranging from 0 to 9 (both inclusive). Marking scheme: +3 for correct answer, 0 if not attempted and 0 in all other cases. 8. A rod is given an angular acceleration from rest so that it rotates in horizontal plane about a vertical axis. It has a small ring at a distance r from the axis of rotation. The friction coefficient between the ring and the rod is . Neglecting gravity. The time after which the ring will start to slip on 1 the rod is sec. Then find the value of n n (Take = 3 rad s 2 and = 1/3) 9. Two identical balls A and B, each of mass 0.1 kg, are attached to two identical massless springs. The spring mass system is constrained to move inside a rigid smooth pipe bent in the form of circle as shown in figure. The pipe is fixed in a horizontal plane. The centres of the balls can move in a circle of radius 0.08 m. Each spring has a natural length of 0.08 m and spring constant 0.1 N/m. Initially, both the balls are displaced by an angle = rad 12 with respect to the diameter PQ of the circle (as shown in fig.) and released from rest. If the frequency of oscillation of ball x B is Hz, then find the value of x. 10. Figure shows two coherent sources S 1 and S 2 vibrating in same phase. AB is an irregular wire lying at a far distance from the source S 1 and S 2 . Let /d = 10 -3 , BOA = 0.12. How many bright spots will be seen on the wire, including points A and B? 11. Intensity of gravitational field E in space at a point depends on co-ordinates (x, y, z) of xi yj the point as E = . If the total mass x 2 + y 2 m inside an imaginary sphere of radius a a with its centre at origin is n times 2G [G universal gravitational constant], then n is 12. A neutron having kinetic energy 12.5 eV collides with a hydrogen atom at rest. Neglect the difference in mass between the neutron and the hydrogen atom and assume that the neutron does not leave its line of motion. Find the possible kinetic energy (in eV) of the neutron after the event. No. of Questions: 54 Max. Marks: 183 Time: 3 Hrs. email: [email protected] øŒEî¦ô¢Ù 11  2019 - JEE - 2019 (Advanced) PAPER - I NªÞœê¦ ví£øŒoõª ¸ôí£æ¨ ›í@ö˺x ÎôÂÓíÆÃúˆÓöËÀö˺ û¦ûË ÓTbÚÛ«uæ¨îË ð¼ú£ªdõª ô¦÷ªÞœªÙè[Ù íÆ£JdöËμjáôÂq ÍÙè ·ÚNªÚÛöËÀq LNªçËμè sÎôÂÓíÆÃúˆÓöËÀz NNëÅ] NòÅ°Þ¥ö˺x û¦ûË ÓTbÚÛ«uæ¨îË ð¼ú£ªdöË òÅ¡KhÚ¨ ë]ô¢Ý°ú£ªhõª ÚÁô¢ªêÁÙC. H ð¼ú£ªdõªnÝ°Sõª: WEóŸªô ÏÙ>FJÙÞ Íú‡šúdÙæËÀn73, þ¼dô Íú‡šúdÙæËÀn03, ðƧô¦tú‡úÃdn03. H NòÅ°Þ¥õª: îμªÚ¥EÚÛöËÀ, ÓöwÚ¨dÚÛöËÀ, ÏûÂvú£ªdîμªÙç˶ù£ûËÂ, ·ÚNªÚÛöËÀ ö°uòËÀ, þ¼dôÂ, ðƧô¦tú‡úÃd. H Íô¢|êŸ: è†ðƧô¢túˆ, HÓúˆq ·ÚNªwúˆd, Ôëμjû¦ è…vU, ú£ÙñÙCÅêŸ vò°ÙàŸªö˺x ÏÙ>FJÙÞ è…ð»x÷«. H ÷óŸªú£ª: 30.04.2019 û¦æ¨Ú¨ 18n30 ú£Ù÷êŸqô¦öË ÷ªëÅ]u ÑÙè¯L. H ÓÙí‡ÚÛ: ÎûËÂöËμjûË ÎòËμbÚ¨dîË çËμúÃd Îëůô¢ÙÞ¥. H ÎûËÂöËμjûË ë]ô¢Ý°ú£ªh:  10 ìªÙ# WûË 9 ÷ô¢ÚÛª. îËμòËÀšújæËÀ: http://www.nationalfertilizers.com/ û¶Oö˺ à¦ôÂb÷ªûË ð¼ú£ªdõª ÏÙè…óŸªûË û¶O ë¶øŒî¦uí£hÙÞ¥ NNëÅ] û¦NÚ¥ë]ü°öË í£JCÅö˺E óŸ´Eæxö˺ à¦ôÂb÷ªûË ð¼ú£ªdöË òÅ¡KhÚ¨ ë]ô¢Ý°ú£ªhõª ÚÁô¢ªêÁÙC. H ð¼ú£ªd: à¦ôÂb÷ªûË H NòÅ°Þ¥öËî¦K Ý°Sõª: îμªÚ¥EÚÂn103, Í÷´uEù£ûË ÍÙè ÓÚÂqð¼x>îËÂn69. H Íô¢|êŸ: ú£ÙñÙCÅêŸ vò°ÙàŸªö˺x ÏÙ>FJÙÞ è…ð»x÷«êÁð§åª ·ôÙè˶üŒx ÍìªòÅ¡÷Ù. H ÷óŸªú£ª: 30 ÔüŒ‰x NªÙàŸÚÛ«è[ë]ª. H ÓÙí‡ÚÛ: ô¦êŸí£K¤Û Îëůô¢ÙÞ¥. H ÎûËÂöËμjûË ë]ô¢Ý°ú£ªh:  13 ìªÙ# 26 ÷ô¢ÚÛª. îËμòËÀšújæËÀ: https://www.joinindiannavy.gov.in/ https://www.indiannavy.nic.in/ Óô³ô ðƼôÂqö˺ ú‡NöËÀ ð¼ú£ªdõª ÏÙè…óŸªûË Óô³ô ðƼôÂq... îËμú£dôÂo Óô³ô ÚÛ÷«Ùè í£JCÅö˺E ›údù£ìªx/ óŸ´Eæxö˺ vÞœ«íà cú‡e ú‡NöËÀ ð¼ú£ªdöË òÅ¡KhÚ¨ ë]ô¢Ý°ú£ªhõª ÚÁô¢ªêÁÙC. H ð¼ú£ªdõªnÝ°Sõª: šúdûËÁ sv¸Þè 2zn01, ÚÛªÚÂn01, ÓÙæ©ÓúÃn01, îμªúà þ§díÆÃn01, vè¯íÆÃd¬q÷ªûË sv¸Þè 3zn01. H Íô¢|êŸ: í£ëÁêŸô¢ÞœA, ÏÙæôÂ, è…ð»x÷«, ÍìªòÅ¡÷Ù. H ÷óŸªú£ª: 18n25 ú£Ù÷êŸqô¦öË ÷ªëÅ]u ÑÙè¯L. H ÓÙí‡ÚÛ: ô¦êŸí£K¤Û, ú‡\öËÀ çËμúÃd Îëůô¢ÙÞ¥. H ë]ô¢Ý°ú£ªh: ÎíÆÃöËμjûË H #÷Jê¶C: ÓÙð§xô³îμªÙæËÀ ì«uúà s11n17  2019zö˺ Ð ví£ÚÛæì îËμõª÷è…ì ê¶D ìªÙ# 30 ôÁVö˺xí£±. ÕÕÓíÆÃÓÙ, òÅ˺ð§öËÀö˺ šíÆö˺ vð¼vÞ¥îª òÅ˺ð§öËÀö˺E ÏÙè…óŸªûË ÏûËÂú‡då«uæËÀ ÎíÆà ðƧ·ôúÃd û¶âËÀîμªÙæËÀ sÕÕÓíÆÃÓÙz šíÆö˺ vð¼vÞ¥÷³ö˺ ví£î˶ø‹öËÚÛª ë]ô¢Ý°ú£ªhõª ÚÁô¢ªêÁÙC. H šíÆö˺ vð¼vÞ¥îª ÏûË û¶âËÀîμªÙæËÀ sÓíÆÃíˆÓÙz H Ú¥öË÷u÷CÅ: û¦õª¸ÞüŒ‰x s2019n23z H Íô¢|êŸ: ú£ÙñÙCÅêŸ NòÅ°Þ¥ö˺x ò°u#öËôÂq è…vU, ÷«ú£dôÂq è…vU, Ôëμjû¦ â°BóŸª þ§–ô³ Íô¢|êŸ í£K¤Ûö˺ ÑBhô¢ªgöËμj ÑÙè¯L.H ÷óŸªú£ª: 01.07.2019 û¦æ¨Ú¨ 45 ÔüŒ‰x NªÙàŸÚÛ«è[ë]ª. H ÓÙí‡ÚÛ: ô¦êŸí£K¤Û, ví£âËμÙç˶ù£ûÂË, í£ô¢qìöËÀ ÏÙæô¢«yu Îëůô¢ÙÞ¥. ë]ô¢Ý°ú£ªh: ÎíÆÃöËμjûË #÷Jê¶C:  31 îËμòËÀšújæËÀ: http://iifm.ac.in/fpm ûÁ æ© úà ò˺ ô¢ª“ ví£òÅ¡ªêŸy ÑëÁuÞ¥õª šíÆö˺ù‡íÃq PHYSICS
Transcript
Page 1: øŒEî¦ô¢Ù JEE - 2019 (Advanced) PAPER - I...øŒEî¦ô¢Ù 11  2019- email: help@eenadupratibha.net H Ôëμjû¦ ÖÚÛ GÅû¦oEo ø‹êŸÙ ô¢«í£Ù-ö˺ڨ

SECTION – I

(Multiple Correct Answer Type)

This section contains 8 multiple choicequestions. Each question has 4 options (A),(B), (C) and (D) for its answer, out of whichONE OR MORE than ONE option can becorrect.Marking scheme: +4 for all correct options &+1 partial marks, 0 if not attempted and –2 inall wrong cases.

1. Two non – collinear forces of equalmagnitude and oppositely directed areacting on a body. Which of the followingstatements is/are correct?A) The resultant torque of the two forces

about any point in the plane of theforces is same

B) The resultant torque of the two forcesabout any axis in the plane of the forcesis same

C) The resultant torque of the two forcesabout any point in space is same

D) The resultant torque of the two forcesabout any axis in space is same

2. The figure showselectronic wave functionfor a hydrogen atom.A) The quantum number

of this state is 6B) The wavelength of

this electron is 6r0.(r0 is radius of ground state)

C) Can go to ground state by emitting 3different photons

D) On de excitation it emits atleast one linein infrared region of spectrum.

3. A charged particleenters into a regionwhich offers a resis-tance against itsmotion and a uni-form magnetic fieldexists in the region.The particle traces a spiral path as shownin figure. Which of the following state-ment(s) is/are correct?A) Component of magnetic field in the

plane of spiral is zeroB) The particle enters the region at Q C) If magnetic field is outward, then the

particle is positively charged

D) If magnetic field is outward, then theparticle is negatively charged

4. An infinitely long current carrying thickcylindrical conductor of radius R has a

Rcylindrical cavity of radius . The axis of 2

Rthe cylindrical cavity is at a distance 2

from the axis ofthe cylindricalconductor. A cur-rent with currentdensity J flowsalong the lengthof the conductor.The magneticfield at a point ‘P’ at a distance 2R from theaxis of the cylinder is (point ‘P’ is on theplane containing both the axes)

0JRA) Magnetic field at P is

120JR

B) Magnetic field at P is 6

C) Magnetic field on the axis of the cavity isnon – zero

D) Magnetic field on the axis of theconductor is non – zero

5. Two different coils have self inductance8mH and 2mH. The current in one coil isincreased at a constant rate. The current inthe second coil is also increased at thesame constant. At a certain instant of time,the power given to the two coils is thesame. At that time the current, the inducedvoltage and the energy stored in the firstcoil are I1, V1 and W1 respectively.Corresponding values for the second coil atthe same instant are I2, V2 and W2respectively. Then:

I1 1 I1A) = B) = 4I2 4 I2W2 V2 1

C) = 2 D) = W1 V1 4

6. In figure shown, the springconstant is k, the mass of theupper block is m and that of thelower block is 3 m. The upperblock is depressed down from itsequilibrium position by a dis-tance and released at t = 0.Which of the following are correct?A) If = 5 mg/k, then the lower block

losses constant with the ground

B) If = 7 mg/k, then the lower blocklosses constant with the ground

C) If = 7 mg/2k, then the minimumnormal reaction on 3 m from ground isless than mg

15 mgD) If = , then the minimum normal

4 kreaction on 3 m from ground is less thanmg

7. A thin uniform rod is supported by a verticalstring and by a hinge H is at equilibrium asshown in figure. In space gravity varies as

xg

= g0 (1 + ) ( j

) m/s2. Vessel is L

completely filled with water. Density ofmaterial of rod is two times the density ofwater. ‘L’ is the length of rod. Rod is free torotate about the hinge ‘H’. Mass of rod ‘m’kg.

mg0A) Initially tension in string is 25B) Initially tension in string is mg012

C) Just after cutting string angular

5g0accelerating of rod is 4L

D) Just after cutting string angular g0accelerating of rod is 2L

SECTION - II

(Integer Answer Type)This section contains 5 questions. The

answer is a single digit integer ranging from0 to 9 (both inclusive).Marking scheme: +3 for correct answer, 0 ifnot attempted and 0 in all other cases.8. A rod is given an angular acceleration

from rest so that it rotates in horizontalplane about a vertical axis. It has a smallring at a distance r from the axis of rotation.The friction coefficient between the ring

and the rod is . Neglecting gravity. Thetime after which the ring will start to slip on

1the rod is sec. Then find the value of nn

(Take = 3 rad s2 and = 1/3)9. Two identical balls

A and B, each ofmass 0.1 kg, areattached to twoidentical masslesssprings. The springmass system isconstrained to move inside a rigid smoothpipe bent in the form of circle as shown infigure. The pipe is fixed in a horizontalplane. The centres of the balls can move ina circle of radius 0.08 m. Each spring hasa natural length of 0.08 m and springconstant 0.1 N/m. Initially, both the balls

are displaced by an angle = rad12

with respect to the diameter PQ of thecircle (as shown in fig.) and released fromrest. If the frequency of oscillation of ball

xB is Hz, then find the value of x.

10. Figure shows two coherent sources S1 andS2 vibrating in same phase. AB is anirregular wire lying at a far distance fromthe source S1 and S2. Let /d = 10-3,BOA = 0.12. How many bright spots willbe seen on the wire, including points A andB?

11. Intensity of gravitational field E

in space ata point depends on co-ordinates (x, y, z) of

xi yj

the point as E

= . If the total massx2 + y2

m inside an imaginary sphere of radius a awith its centre at origin is n times

2G[G universal gravitational constant], thenn is

12. A neutron having kinetic energy 12.5 eVcollides with a hydrogen atom at rest.Neglect the difference in mass betweenthe neutron and the hydrogen atom andassume that the neutron does not leave itsline of motion. Find the possible kineticenergy (in eV) of the neutron after the event.

No. of Questions: 54 Max. Marks: 183 Time: 3 Hrs.

email: [email protected]øŒEî¦ô¢Ù 11  2019 -

JEE - 2019 (Advanced) PAPER - I

NªÞœê¦ ví£øŒoõª ¸ôí£æ¨ ›í@ö˺x

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šíÆö˺ù‡íÃq

PHYSICS

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10120 10

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