VIGYAN DHARA EDUCATION Pvt. Ltd. 11TH MEDICAL (27-03-20… · VIGYAN DHARA TEST SERIES CLASS-XI (M EDICAL) PHYSICS + CHEMISTRY Test Code : VD20/PC/NEET/01/2703 Time : 2 Hours IMPORTANT

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TEST - 6

27/03/2020

VIGYAN DHARATEST SERIES

CLASS-XI (MEDICAL)PHYSICS + CHEMISTRY

Test Code : VD20/PC/NEET/01/2703

Time : 2 Hours M.M. : 360IMPORTANT INSTRUCTIONS

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11TH MEDICAL (2) VD20/PC/NEET/01/2703

Space for Rough Work

SYLLABUS TEST - 6

PHYSICS

CHEMISTRY

SHM, WAVES

GOC-II


VD20/PC/NEET/01/2703 (3) 11TH MEDICAL


1. The displacement of a particle executing simpleharmonic motion is given by y = A0 + Asint +Bcost. The amplitude of its oscillation is givenby

(A) A + B (B) 2 20A A B

(C) 2 2A B (D) 220A A B

2. The distance covered by a particle undergoingSHM in one time period is (amplitude = A)(A) zero (B) A(C) 2A (D) 4A

3. A particle executes linear simple harmonic motionwith an amplitude of 3 cm. When the particle is at2 cm from the mean position, the magnitude ofits velocity is equal to that of its acceleration. Thenits time period in seconds is

(A)5

(B)5

2

(C)4

5

(D)2

3

4. A body of mass m is attached to the lower end ofa spring whose upper end is fixed. The spring hasnegligible mass. When the mass m is slightlypulled down and released, it oscillates with a timeperiod of 3 s. When the mass m is increased by1 kg, the time period of oscillations becomes 5 s.The value of m in kg is

(A)34 (B)

43

(C)169 (D)

916

5. A particle is executing a simple harmonic motion.Its maximum acceleration is and maximumvelocity is . Then, its time period of vibration willbe

(A)2

(B)2

2

(C) (D)

2

6. When two displacements represented by

1y asin t and 2y bcos t are

superimposed the motion is

(A) Simple harmonic with amplitude a b

2

(B) Not a simple harmonic

(C) Simple harmonic with amplitudeab

(D) Simple harmonic with amplitude 2 2a b7. The particle executing simple harmonic motion

has a kinetic energy 20K cos t . The maximum

values of the potential energy and the total energyare respectively(A) K0 and K0 (B) 0 and 2K0

(C) 00

K and K2 (D) K0 and 2K0

8. If the length of a simple pendulum is increased by2%, then the time period

(A) Increases by 1% (B) Decreases by 1%

(C) Increases by 2% (D) Decreases by 2%




9. The oscillation of a body on a smooth horizontalsurface is represented by the equation, x =Acos(t), where xis displacement at time tand wis frequency of oscillation. Which one of thefollowing graphs shows correctly the variation awith t?

(A)

(B)

(C)

(D)

10. The potential energy of a particle of mass 100 gmoving along x-axis is given by U = 5x(x – 4) ,where x is in metre. The period of oscillation is

(A) 0.2 s (B) 0.1 s

(C) s (D)1 s

11. In the adjacent figure, if the incline plane is smoothand the springs are identical, then the period ofoscillation of this body is

(A)M22k

(B)2M2k

(C)M2

k sin

(D)

Msin2k

12. Five identical springs are used in the threeconfigurations as shown in figure. The time periodsofvertical oscillations in configurations (a), (b) and(c) are in the ratio

(A)11: 2 :2 (B)

12 : 2 :2

(C)1 : 2 :12 (D)

12 : :12




13. The time period of a simple pendulum of length Las measured in an elevator descending with

accelerationg3 is

(A)3L22g

(B)3Lg

(C)3L2g

(D)2L23g

14. The maximum time period of oscillation of a sim-ple pendulum of large length is:

(A) Infinity (B) 24 hours

(C) 12 hours (D) 1½ hours

15. The plot of velocity (v) versus displacement (x) ofa particle executing simple harmonic motion isshown in figure. The time period of oscillation ofparticle is

(A) s2

(B) s

(C) 2 s

(D) 3 s

16. A simple pendulum with a metallic bob has a timeperiod T. The bob is now immersed in a non-viscousliquid and oscillated. If the density of the liquid is1/4 that of metal, the time period of the samependulum will be

(A)T3 (B)

2T3

(C)4 T3 (D)

2 T3

17. A uniform rod of mass m and length l is suspendedabout its end. Time period of small angularoscillations is

(A)l2g

(B)2l2g

(C)2l23g

(D)l2

3g

18. A block of mass m is suspended separately bytwo different springs have time period t1 and t2. Ifsame mass is connected to parallel combinationof both springs, then its time periqd is given by

(A) 1 2

1 2

t tt t (B)

1 22 21 2

t tt t

(C) 1 2

1 2

t tt t (D) t1 + t2




19. A block of mass m hangs from three springs havingsame spring constant k. If the mass is slightlydisplaced downwards, the time period of oscillationwill be

(A)m23k

(B)3m22k

(C)2m23k

(D)3k2m

20. A tuning fork with frequency 800 Hz producesresonance in a resonance column tube with upperend open and lower end closed by water surface.Successive resonance are observed at length 9.75cm, 31.25 cm and 52.75 cm. The speed of soundin air is

(A) 500 m/s (B) 156 m/s(C) 344 m/s (D) 172 m/s

21. The fundamental frequency in an open organ pipeis equal to the third harmonic of a closed organpipe. If the length of the closed organ pipe is 20cm, the length of the open organ pipe is

(A) 13.2 cm (B) 8 cm(C) 12.5 cm (D) 16 cm

22. The two nearest harmonics of a tube closed atone end and open at other end are 220 Hz and260 Hz. What is the fundamental frequency ofthe system?

(A) 10Hz (B) 20Hz(C) 30Hz (D) 40Hz

23. A siren emitting a sound of frequency 800 Hz movesaway from an observer towards a cliff at a speed of15 ms–1. Then, the frequency of sound that theobserver hears in the echo reflected from the cliffis (Take velocity of sound in air = 330 ms–1)

(A) 885 Hz (B) 765 Hz

(C) 800 Hz (D) 838 Hz

24. I f n 1, n2 and n3 are the fundamental frequencies ofthree segments into which a string is divided, thenthe original fundamental frequency n of the stringis given by

(A)1 2 3

1 1 1 1n n n n

(B)1 2 3

1 1 1 1n n n n

(C) 1 2 3n n n n

(D) 1 2 3n n n n

25. The number of possible natural oscillations of aircolumn in a pipe closed at one end of length 85cm whose frequencies lie below 1250Hz are(velocity of sound = 340 ms–1)

(A) 4 (B) 5(C) 7 (D) 6

Dell

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If n




26. A source of unknown frequency gives 4 beats/s,when sounded with a source of known frequency250 Hz. The second harmonic of the source ofunknown frequency gives five beats per second,when sounded with a source of frequency 513 Hz.The unknown frequency is(A) 246 Hz (B) 240 Hz(C) 260 Hz (D) 254 Hz

27. The equation of a simple harmonic wave is given

by y 3sin 50t x2

, where x and y are in

metres and t is in seconds. The ratio of maximumparticle velocity to the wave velocity is

(A) 2 (B)32

(C) 3 (D)23

28. Sound waves travel at 350 m/s through a warmair and at 3500 m/s through brass. The wavelengthof a 700 Hz acoustic wave as it enters brass fromwarm air(A) Decreases by a factor 20(B) Decreases by a factor 10(C) Increases by a factor 20(D) Increases by a factor 10

29. A wave of frequency 100 Hz travels along a stringtowards its fixed end. When this wave traveisback, after reflection, a node is formed at a distanceof 10 cm from the fixed end. The speed of thewave (incident and reflected) is(A) 20 m/s (B) 40 m/s(C) 5 m/s (D) 10 m/s

30. In a medium in which a transverse progressivewave is travelling, the phase difference between

two points with a separation of 1.25 cm is 4 If

the frequency of wave is 1000Hz. Its velocity willbe(A) 104 m/s (B) 125 m/s(C) 100 m/s (D) 10 m/s

31. The linear density of a vibrating string is 10–4 kg/m.A transverse wave is propagating on the string,which is described by the equationy = 0.02 sin (x + 30 t),where x and y are in metres and time t in seconds.The tension in the string is(A) 0.09 N (B) 0.36 N(C) 0.9 N (D) 3.6 N

32. At t = 0, a transverse wave pulse travelling in thepositive x direction with a speed of 2 m/s in a wire

is described by the function 26yx given that

x 0. Transverse velocity of a particle atx = 2 m and t = 2 s is(A) 3 m/s (B) –3 m/s(C) 8 m/s (D) –8 m/s

33. A point source of sound is placed in a non-absorbing medium. Two points A and B are at thedistances of 1m and 2 m, respectively, from thesource. The ratio of amplitudes of waves at A to Bis(A) 1 : 1 (B) 1 : 4(C) 1 : 2 (D) 2 : 1




34. Two wires are kept tight between the same pair ofsupports. The tensions in the wires are in the ratio2 : 1, the radii are in the ratio 3 : 1 and the densitiesare in the ratio 1 : 2. The ratio of their fundamentalfrequency is(A) 2 : 3 (B) 2 : 4(C) 2 : 5 (D) 2 : 6

35. Speed of sound wave is v. If a reflector movestowards a stationary source emitting waves offrequency f with speed u, the frequency of reflectedwaves observed by stationary source will be

(A)v u fv u

(B)v u f

v

(C)v u fv u

(D)v u f

v

36. An observer moves towards a stationary sourceof sound with a velocity one fifth of the velocity ofsound. What is the percentage increase in theapparent frequency?(A) 5% (B) 20 %(C) 0 % (D) 0.5 %

37. A source of sound emits 200 W power which isuniformly distributed over a sphere of radius 10 m.What is the loudness of sound on the surface ofthe sphere?(A) 70 dB (B) 74 dB(C) 80 dB (D) 117 dB

38. An open pipe is resonance in its 2nd harmonicwith tuning fork of frequency f1. Now it is closed atone end. If the frequency of the tuning fork isincreased slowly from f1 then again a resonanceis obtained with a frequency f2. If in this case thepipe vibrates in nth harmonics, then

(A) n = 3, f2 = 13 f4 (B) n = 3, f2 = 1

5 f4

(C) n = 5, f2 = 15 f4 (D) n = 5, f2 = 1

3 f4

39. A particle executes simple harmonic motion witha time period of 16 s. At time t = 2 s, the particlecrosses the mean position while at t = 4 s, velocityis 4 ms–1. The amplitude of motion in metre is

(A) 2 (B) 16 2

(C) 24 2 (D)32 2

40. A particle is oscillating in SHM. What fraction oftotal energy E is kinetic when the particle is atA/2 from the mean position? (A is the amplitudeof oscillation)

(A)3E2 (B)

3 E4

(C)E2 (D) 3E

41. The period of oscillation of a simple pendulum oflength l suspended from the roof of a vehicle, whichmoves without friction, down an inclined plane ofinclination is given by

(A)l2

gcos

(B)l2

gsin

(C)l2g

(D)l2

gtan




42. The amplitude of a wave disturbance propagating

along positive x-axis is given by 21y

1 x at

t = 0 and 21y

1 x 2

at t = 4s where x and

y are in metre. The shape of wave disturbancedoes not change with time. The velocity of thewave is

(A) 0.5 m/s (B) 1 m/s

(C) 2 m/s (D) 4 m/s

43. A uniform rope of length 12m and mass 6kg hangsvertically from a rigid support. A block of mass 2kg is attached to the free end of the rope. Atransverse pulse of wavelength 0.06 m is producedat the lower end of the rope. The wavelength ofthe pulse when it reaches the top of the rope is

(A) 0.012 m (B) 0.06 m

(C) 0.24 m (D) 0.12 m

44. A string is rigidly tied at two ends and its equationof vibration is given by

y = cos2t sin 2x.

Then minimum possible length of string is maybe

(A) 10 m (B)5 m2

(C) 5 m (D) 2 m

45. The superposing waves are represented by thefollowing equations

y1 = 5 sin 2(10t – 0.1x),

y2 = 10 sin 2(20t – 0.2x).

Ratio of intensitiesmax

min

will be

(A) 1 (B) 9

(C) 4 (D) 16

46 Tautomerism is exhibited by -

(A)Me Me

Me Me

OO

(B) CH3–CH2–N OO

(C)

O

O

(D)

CH=O

47 Which of the following will lead to maximumenolisation -

(A)CH3–C–CH3

||O

(B)CH3–C–CH2–C–H

||O

||O

(C)CH3–C–CH–C–CH3

||O

||O

|Br (D)

O

48 CH3 - CH2 - CHO & CH2 = CH - CH2OH are –

(A) Functional (B) Tautomers

(C) Position (D) Metameres




49

O

O

O

O

O

O

(I) (II) (III)

Among the given structures which can exhibittautomerism ?

(A) only I (B) only II

(C) only III (D) none of these

50 Which is most basic compound –

(A)

NH2. .

MeMe (B)

NH2. .

MeMe

(C)

N. .

MeMe

MeMe

(D)

NH2. .

MeMe

Me

51 Rank the hydrogen atoms according to their acidicstrength

H

H

H

(A) > > (B) > >

(C) > > (D) > >

52 Consider the hydrogen atoms attached to threedifferent carbon atoms (labeled 1, 2 & 3). Rankthe attached hydrogen atoms in order from mostacidic to least acidic –

||||O O

O

3

1 2

(A) 1 > 2 > 3 (B) 2 > 1 > 3

(C) 2 > 3 > 1 (D) 3 > 2 > 1

53

NH, NH, N

(x) (y) (z)O

The correct order of decreasing basic strengths

of x, y and z is:

(A) x > y > z (B) x > z > y

(C) y > x > z (D) y > z > x

54 Which nitrogen in LSD (Lysergic acid anddiethylamide) is more basic -

HN

NII

C–N(C2H5)2

O IIII

CH3

(A) I

(B) II

(C) III

(D) All are equally basic




55 Which is most acidic compound -

(A)OH

(B)COOH

(C)

COOHCH3 (D)

OHCH3

56 Give the correct order of increasing acidity of thehydrogen bonded to nitrogen in the followingcompounds -

NH2

(I)

C – NH2

(II)

O

C

(III)

O

CNH

O(IV)

CH3CH2NH2

(A) III < II < IV < I (B) IV < I < II < III

(C) II < I < III < IV (D) I < IV < II < III

57 The strongest base is–

(A)CH3–N–CH3

CH3(B)

CH2N NH

NH2

(C)C6H5–N–C6H5

C6H5(D) CH3–NH–CH3

58 Which of the following is not a pair of tautomers -

(A)

OHN NH

NHO O and

OH

N N

NHO OH

(B)OH

andO

(C)O

O and OH

(D)H2N–C–NH2

O andH2N–C=NH

OH

59 Arrange the following in decreasing of their basicnature -

N N

NH2

I II III

(A) I > II > III (B) II < III < I

(C) III < II > I (D) II > I > III

60 Give the correct order of increasing acidity of thefollowing compounds -

(I) OH (II) OH

(III) COOH (IV) CCH

(A) II < I < IV < III (B) IV < II < I < III

(C) I < II < IV < III (D) IV < I < II < III




61 Which of the following acid-base reaction is notfeasible -

(A) N NHH N N H

H

(B)

N

NH

H

N

NH

H

(C)N

NH

H

N

NH

H

(D) H2N–CNH

NH2

H H2N–C

NH2

NH2

62 In which of the following keto-enol systems theenol state is more stable than the keto state :

(A)

O

HN

O ONH

OH

N

HO N OH

(B)

OHOH

(C)

OH

H

OH

OHO(D) All the above

63 Which compound has most active hydrogen atom?

(A)

OH3CH3C

CH3

CH3 (B)

O

(C)

O

H3C CH3

(D)

OCH3

CH3

64

O

IO

NӨ

O

II

NӨ

III

NӨ

The basic strength of the ions I, II and III decreasein the order

(A) I > II > III (B) III > II > I

(C) II > I > III (D) I > III > II

65 Which of the following represent the decreasingorder of Ka values ?

NO2

HO

OH

COOH

C CH

(iii)

(iv)

(i)

(ii)




(A) (ii) > (i) > (iii) > (iv)

(B) (ii) > (iii) > (i) > (iv)

(C) (i) > (ii) > (iii) > (iv)

(D) (ii) > (iv) > (i) > (iii)

66 Which one of the following is maximum acidic –

(A) NO2

OH

CH3

CH3(B)

OHCH3

CH3

NO2

(C)CH3

OH

NO2

CH3(D)

CH3

OHCH3

NO2

67 The strongest base among the following is –

(A) CH3NH2 (B) CH3CH2NH2

(C) (CH3)2NH (D) (CH3)3N

68 Which one of the following compounds is mostacidic –

(A)NO2

OH

(B)CH3

OH

(C)OH

(D) ClCH2CH2OH

69 Consider the acidic nature of the carboxylic acids -

(a) PhCOOH

(b) o – NO2C6H4COOH

(c) p – NO2C6H4COOH

(d) m – NO2C6H4COOH

Which of the following order is correct ?

(A) a > b > c > d (B) b > d > c > a

(C) b > d > a > c (D) b > c > d > a

70 Which of the following has the highest

nucleophilicity ?

(A) F (B) OH

(C) CH3 (D) NH2

71 Which of the following has the most acidic

hydrogen ?

(A) 3-Hexanone

(B) 2,4-Hexanedione

(C) 2,5-Hexanedione

(D) 2,3-Hexanedione

72 The correct order of basicities of the followingcompounds is -

(a) CH3 CNH2

NH(b) CH3CH2NH2

(c) (CH3)2NH (d)CH3–C–NH2

O

(A) b > a > c > d (B) a > c > b > d

(C) c > a > b > d (D) a > b > c > d




73. Which statement about tautomerism is incorrect ?

(A) Tautomers always exist in equilibrium.

(B) Tautomers can be separated by physical /chemical process.

(C) Tautomerism is a chemical phenomenon whichtakes place in liquid and gaseous state andcatalysed by acid as well as base.

(D) All tautomers are always functional groupisomers.

74.

How many enolisable –H are present in the abovecompound ?

( A ) 2 ( B ) 3

( C ) 4 ( D ) 5

7 5 . A r r a n g e t h e f o l l o w i n g s i n d e c r e a s i n g o r d e r o f p e r -

c e n t a g e e n o l c o n t e n t .

( i ) (ii)

(iii) (iv)

(A) I > II > III > IV (B) II > I > III > IV(C) II > III > I > IV (D) III > II > IV > I

76. The correct basic strength order of following anionsis :

(A) > > > > >

(B) > > > > >

(C) > > > > >

(D) > > > > >

77. Which of the following cannot be a base ?

(A) (B)O||

NHCCH 23

(C) (D)

78. Which of the following option shows the correctorder of decreasing acidity :

(A) PhCO2H > PhSO3H > PhCH2OH > PhOH

(B) PhSO3H > PhOH > PhCH2OH > PhCOOH

(C) PhCO2H > PhOH > PhCH2OH > PhSO3H

(D) PhSO3H > PhCO2H > PhOH > PhCH2OH

79. Arrange Increasing order of acidic strength of fol-lowing dibasic acids :

(I) oxalic acid, (II) succinic acid,(III) malonic acid, (IV) adipic acid

(A) III < II < I < IV (B) II < III > I > IV(C) I > III > II > IV (D) II > I > III < IV

Dell

Typewriter

(A) 2

Dell

Typewriter

(B) 3

Dell

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(C) 4

Dell

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(D) 5

Dell

Typewriter

75.

Dell

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Arrange the followings in decreasing order of

Dell

Typewriter

percentage enol content.

Dell

Typewriter

(i)




80. Among the given reaction which of the followingfavours backward reaction ?

(A)

(B)

(C)

(D)

81. COONaCHofMole1 3

The products will be :

(A) + CH3COOH

(B) + CH3COOH

(C) + CH3COOH

(D) Reaction is not feasible

82. The stability order of the following anions :

(A) IV > III > II > I (B) I > II > III > IV

(C) I > II > IV > III (D) I > III > II > IV83. Tautomerism is exhibited by

(A) (B)

(C) (D)

84. Which statement is incorrect about the followingreaction ?

(A) It undergoes racemisation

(B) It undergoes D-exchange at asymmetric C * atom

(C) Rate of racemisation is equal to rate of D-exchange

(D) The product is laevorotatory




85. Compound 'X' has significant amount of enol 'Y'.'X' racemises during enolisation. ' X ' can be

(A)

H|

OCH—C—HCO|Cl

(B)

(C)

(D)

86. The feasible reaction is :

(A) CH3COOH + NaCl

(B) C6H5COOH + KBr

(C) + KHSO4

(D) +

87. What is the acidity order of x, y & z ?

(A) x > y > z (B) x > z > y(C) y > z > x (D) z > y > x

88. Identify the compound that exhibits tautomerism.

(A) 2-Butene (B) Lactic acid(C) 2-Pentanone (D) Phenol

89. The gases produced in the following reactions arerespectively

I : CH3NH2 + NH4Br

II : CH3SO3H + NaHCO3

III :O||

NHCCH 23 + NaH

(A) NH3, NH3, CO2 (B) NH3, SO2, H2

(C) NH3, SO2, NH3 (D) NH3, CO2,H2

90. Order of Ka which can be predicted by followingreaction is :

(A) NH3 > Ph3CH > C2H2 > H2O(B) H2O > HC CH > Ph3CH > NH3

(C) HC CH > H2O > Ph3CH > NH3

(D) Ph3CH > HC CH > H2O > NH3

1 C 46 B2 D 47 D3 C 48 A4 D 49 B5 A 50 C6 D 51 B7 A 52 B8 A 53 B9 C 54 B10 A 55 C11 A 56 B12 A 57 B13 A 58 C14 D 59 B15 A 60 B16 B 61 A17 C 62 D18 B 63 B19 B 64 B20 C 65 A21 A 66 D22 B 67 C23 D 68 A24 A 69 D25 D 70 C26 D 71 B27 B 72 B28 D 73 D29 A 74 B30 C 75 A31 A 76 C32 B 77 D33 D 78 D34 A 79 C35 C 80 D36 B 81 B37 D 82 B38 C 83 A39 D 84 D40 B 85 B41 A 86 D42 A 87 A43 D 88 C44 B 89 D45 B 90 B

ANS 11TH MEDICAL TEST-6 (27-03-2020)PHYSICS CHEMISTRY

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VIGYAN DHARA EDUCATION Pvt. Ltd. 11TH MEDICAL (27-03-20… · VIGYAN DHARA TEST SERIES CLASS-XI (M EDICAL) PHYSICS + CHEMISTRY Test Code : VD20/PC/NEET/01/2703 Time : 2 Hours IMPORTANT