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Physics
Q.1. A uniform string is vibrating with a fundamental frequency ‘n’. If radius and length of string both are doubled keeping tension constant then the new frequency of vibration is
A. 2n
B. 3n
C. \frac{n}{4}
D. \frac{n}{3}
Answer :- C. \frac{n}{4}
Q.2. Let γ1 be the ratio of molar specific heat at constant pressure and molar specific heat at constant volume of a monoatomic gas and γ2 be the similar ratio of diatomic gas. Considering the diatomic gas molecule as a rigid rotator, the ratio \frac{\gamma_{2} }{\gamma_{1}} is
A. \frac{37}{21}
B. \frac{27}{35}
C. \frac{21}{25}
D. \frac{35}{27}
Answer :- C. \frac{21}{25}
Q.3. A railway track is banked for a speed ‘,v’ by elevating outer rail by a height ‘h’ above the inner rail. The distance between two rails is ‘d’ then the radius of curvature of track is ( g= gravitational acceleration)
A. \frac{v^{2}d}{gh}
B. \frac{2 \mathrm{v}^2}{\mathrm{gdh}}
C. \frac{\mathrm{gd}}{2 \mathrm{v}^2 \mathrm{~h}}
D. \frac{\mathrm{v}^2}{2 \mathrm{ghd}}
Answer: A. \frac{v^{2}d}{gh}
Q.4. In the given capacitive network the resultant capacitance between point A and B is
A. 8 μF
B. 4 μF
C. 2 μF
D. 16 μF
Answer :- B. 4 μF
Q.5. In Young’s double slit experiment the intensities at two points, for the path difference \frac{\lambda }{4} and \frac{\lambda }{3} (λ= wavelength of light used) are I1 and I2 respectively. If I0 denotes the intensity produced by each one of the individual slits then \frac{I_{1}+I_{2} }{I_{o}} is equal to \left ( cos\; 60^{o}=0.5, cos\; 45^{o}=\frac{1}{\sqrt{2}} \right )
A. 1
B. 2
C.3
D. 4
Answer :- C.3
Q.6. A simple pendulum performs simple harmonic motion about x=0 with an amplitude ‘a’ and time period ‘T’. The speed of the pendulum at x=\frac{a}{2} is
A. \frac{\pi a}{T}
B. 3\frac{\pi^{2} a}{T}
C. \frac{\pi a\sqrt{3}}{T}
D. \frac{\pi a\sqrt{3}}{2}
Answer :- C. \frac{\pi a\sqrt{3}}{T}
Q.7.The molar specific heat of an ideal gas at constant pressure and constant volume is Cp and Cv respectively. If R is universal gas constant and \gamma =\frac{C_{p}}{C_{v}} then Cv=?
A. \frac{1-\gamma }{1+\gamma }
B. \frac{1+\gamma }{1-\gamma }
C. \frac{\gamma-1 }{R}
D. \frac{R }{\gamma-1 }
Answer :- D. \frac{R }{\gamma-1 }
Q.8. Resistance of a potentiometer wire is 2Ω/m. A cell of e.m.f. 1.5 V balances at 300 cm. The current through the wire is
A. 2.5 mA
B. 7.5 mA
C. 250 mA
D. 750 mA
Answer :- C. 250 mA
Q.9. A,B and C are three parallel conductors of equal lengths and carry currents I, I and 2I respectively as shown in figure. Distance AB and BC is same as ‘d’. If ‘F1‘ is the force exerted by B on A and F2 is the force exerted by C on A, then
A. F1=F2
B. F1 = -F2
C. F1 = 2F2
D. F_{1}=\frac{1}{2}F_{2}
Answer :- B. F1 = -F2
Q.10. Two electric dipoles of moment P and 27P are placed on a line with their centres 24 cm apart. Their dipole moments are in opposite direction. At which point the electric field will be zero between the dipoles from the centre of dipole of moment P?
A. 6 cm
B. 8 cm
C. 10 cm
D. 12 cm
Answer:- A. 6 cm
Q.11. Converging or diverging ability of a lens or mirror is called
A. focal power
B. focal length
C. magnifying power
D. linear magnification
Answer :- A. focal power
Q.12. The following logic gate combination is equivalent to
A. NAND gate
B. OR gate
C. XOR gate
D. NOT gate
Answer :- C. XOR gate
Q.13. Radiations of two photons having energies twice and five times the work function of metal are incident successively on metal surface. The ratio of the maximum velocity of photo electrons emitted in the two cases will be
A. 1 : 1
B. 1 : 2
C. 1 : 3
D. 1 : 4
Answer :- B. 1:2
Q.14. Time period of simple pendulum on earth’s surface is ‘T’. Its time period becomes ‘xT’ when taken to a height R (equal to earth’s radius) above the earth’s surface. Then the value of ‘x’ will be
A.4
B. 2
C. \frac{1}{2}
D. \frac{1}{4}
Answer :- B. 2
Q.15. Consider a soap film on a rectangular frame of wire of area 3×3 cm2. If the area of the soap film is increased to 5×5 cm2, the work done in the process will be (surface tension of soap solution is 2.5×10−2 N/m)
A. 9×10−6 J
B. 16×10−6 J
C. 40×10−6 J
D. 80×10−6 J
Answer :- D. 80×10−6 J
Q.16. In Lyman series, series limit of wavelength is λ1. The wavelength of first line of Lyman series is λ2 and in Balmer series, the series limit of wavelength is λ3. Then the relation between λ1, λ2 and λ3 is
A. λ1=λ2+λ3
B. λ2=λ1+λ3
C. \frac{1}{\lambda_{1} }=\frac{1}{\lambda_{2} }-\frac{1}{\lambda_{3} }
D. \frac{1}{\lambda_{1} }-\frac{1}{\lambda_{2} }=\frac{1}{\lambda_{3} }
Answer :- D. \frac{1}{\lambda_{1} }-\frac{1}{\lambda_{2} }=\frac{1}{\lambda_{3} }
Q.17. The magnetic moment of a current (I) carrying circular coil of radius ‘r’ and number of turns ‘n’ depends on
A. n only
B. I only
C. r only
D. n,I and r
Answer :- D. n,I and r
Q.18. A spherical drop of liquid splits into 1000 identical spherical drops. If ‘E1‘ is the surface energy of the original drop and ‘E2‘ is the total surface energy of the resulting drops, then \frac{E_{1}}{E_{2}}=\frac{x}{10} . Then value of ‘x’ is
A. 9
B. 7
C. 3
D. 1
Answer :- D. 1
Q.19. The displacement of two sinusoidal waves is given by the equation
y1=8sin(20x−30t)
y2=8sin(25x−40t)
then the phase difference between the waves after time t=2 s and distance x=5 cm will be
A. 2 radian
B. 3 radian
C. 4 radian
D. 5 radian
Answer :- D. 5 radian
Q.20. I1 is the moment of inertia of a circular disc about an axis passing through its centre and perpendicular to the plane of disc. I2 is its moment of inertia about an axis AB perpendicular to plane and parallel to axis CM at a distance \frac{2R}{3|} from centre. The ratio of I1 and I2 is x:17. The value of ‘x’ is (R = radius of the disc)
A. 9
B. 12
C. 15
D. 17
Answer :- A. 9
Q.21. The equivalent capacity between terminal A and B is
A. \frac{C}{4}
B. \frac{3C}{4}
C. \frac{C}{3}
D. \frac{4C}{3}
Answer :- D. \frac{4C}{3}
Q.22. Two similar coils each of radius R are lying concentrically with their planes at right angles to each other. The current flowing in them are I and 2I. The resultant magnetic field of induction at the centre will be (μ0= Permeability of vacuum)
A. \frac{\mu _{o}I}{2R}
B. \frac{\mu _{o}I}{R}
C. \frac{3\mu _{o}I}{2R}
D. \frac{\sqrt{5}\mu _{o}I}{2R}
Answer :- D. \frac{\sqrt{5}\mu _{o}I}{2R}
Q.23. The logic gate combination circuit shown in the figure performs the logic function of
A. AND gate
B. NAND gate
C. OR gate
D. XOR gate
Answer :-A. AND gate
Q.24. Two sounding sources send waves at certain temperature in air of wavelength 50 cm and 50.5 cm respectively. The frequency of sources differ by 6 Hz. The velocity of sound in air at same temperature is
A. 300 m/s
B. 303 m/s
C. 313 m/s
D. 330 m/s
Answer :- B. 303 m/s
Q.25. In the given circuit, r.m.s. value of current through the resistor R is
A. 2A
B. 0.5 A
C. 20 A
D. 2\sqrt{2} A
Answer :- A. 2A
Q.26. A particle of mass ‘m’ moving east ward with a speed ‘v’ collides with another particle of same mass moving north-ward with same speed ‘v’. The two particles coalesce after collision. The new particle of mass ‘ 2 m’ will move in north east direction with a speed (in m/s )
A. V
B. 2V
C. \frac{V}{2}
D. {V}{\sqrt{2}}
Answer :- D. {V}{\sqrt{2}}
Q.27. The height at which the weight of the body becomes \frac{1}{9} its weight on the surface of earth is (R= radius of earth)
A. 8R
B. 4R
C. 3R
D. 2R
Answer :- D. 2R
Q.28. A single turn current loop in the shape of a right angle triangle with side 5 cm,12 cm,13 cm is carrying a current of 2 A. The loop is in a uniform magnetic field of magnitude 0.75 T whose direction is parallel to the current in the 13 cm side of the loop. The magnitude of the magnetic force on the 5 cm side will be \frac{x}{130} N. The value of ‘x’ is
A. 4
B. 9
C. 12
D. 15
Answer :- B. 9
Q.29. 41 tuning forks are arranged in increasing order of frequency such that each produces 5 beats/second with next tuning fork. If frequency of last tuning fork is double that of frequency of first fork. Then frequency of first and last fork is
A. 400,200 Hz
B. 200,400 Hz
C. 100,200 Hz
D. 205,410 Hz
Answer :- B. 200,400 Hz
Q.30. In two separate setups for Biprism experiment using same wavelength, fringes of equal width are obtained. If ratio of slit separation is 2:3 then the ratio of the distance between the slit and screen in the two setups is
A. 2:3
B. 1:2
C. 4:9
D. 9:4
Answer :- A. 2:3
Q.31. A composite slab consists of two materials having coefficient of thermal conductivity K and 2 K, thickness x and 4x respectively. The temperature of the two outer surfaces of a composite slab are T2 and T1( T2>T1). The rate of heat transfer through the slab in a steady state is \left [ \frac{A(T_{2}-T_{1})K}{x} \right ]⋅f where ‘f’ is equal to
A. 1
B. \frac{2}{3}
C. \frac{1}{2}
D. \frac{1}{3}
Answer :- D. \frac{1}{3}
Q.32. A black sphere has radius ‘R’ whose rate of radiation is ‘E’ at temperature ‘T’. If radius is made R/3 and temperature ‘3T’, the rate of radiation will be
A. E
B.3E
C.6E
D. 9E
Answer :- D. 9E
Q.33. The potential on the plates of capacitor are +20 V and −20 V. The charge on the plate is 40C. The capacitance of the capacitor is
A. 2 F
B. 1 F
C. 4 F
D. 0.5 F
Answer :- B. 1 F
Q.34. A thin uniform circular disc of mass ‘M’ and radius ‘R’ is rotating with angular velocity ‘ω’, in a horizontal plane about an axis passing through its centre and perpendicular to its plane. Another disc of same radius but of mass (\frac{M}{2}) is placed gently on the first disc co-axially. The new angular velocity will be
A. \frac{2}{3}\omega
B. \frac{4}{5}\omega
C. \frac{5}{4}\omega
D. \frac{3}{2}\omega
Answer :- A. \frac{2}{3}\omega
Q.35. A gas at normal temperature is suddenly compressed to one-fourth of its original volume. If \frac{C_{p}}{C_{v}}=γ=1.5, then the increase in its temperature is
A. 273 K
B. 373 K
C. 473 K
D. 573 K
Answer :- A.273 K
Q.36. When light of wavelength λ is incident on a photosensitive surface the stopping potential is ‘V’. When light of wavelength 3λ is incident on same surface the stopping potential is \frac{V}{6} . Then the threshold wavelength for the surface is
A. 2λ
B. 3λ
C. 4λ
D. 5λ
Answer :- D. 5λ
Q.37. One of the necessary condition for total internal reflection to take place is
( i= angle of incidence, ic= critical angle)
A. i < ic
B. i=ic
C. i=\frac{\pi^{c}}{2}
D. i > ic
Answer :- D. i > ic
Q.38. In the given circuit, if \frac{dI}{dt} =−1 A/s then the value of (VA−VB) at this instance will be
A. 30 V
B. 24 V
C. 18 V
D. 9 V
Answer :- A. 30 V
Q.39. An inductor of 0.5 mH, a capacitor of 20 μF and a resistance of 20Ω are connected in series with a 220 V a.c. source. If the current is in phase with the e.m.f. the maximum current in the circuit is \sqrt{x} A. The value of ‘x’ is
A. 44
B. 82
C. 146
D. 242
Answer :- D. 242
Q.40. The wavelength of radiation emitted is ‘λ0‘ when an electron jumps from the second excited state to the first excited state of hydrogen atom. If the electron jumps from the third excited state to the second orbit of the hydrogen atom, the wavelength of the radiation emitted will be \frac{20}{x} λ0. The value of x is
A.3
B.9
C. 13
D. 27
Answer :- D. 27
Q.41. Two particles having mass ‘M’ and ‘m’ are moving in a circular path with radius ‘R’ and ‘r’ respectively. The time period for both the particles is same. The ratio of angular velocity of the first particle to the second particle will be
A. 1 : 1
B. 1 : 2
C. 2 : 3
D. 3 : 4
Answer :- A.1 : 1
Q.42. The excess pressure inside a first spherical drop of water is three times that of second spherical drop of water. Then the ratio of mass of first spherical drop to that of second spherical drop is
A. 1 : 3
B. 1 : 6
C.1 : 9
D. 1 : 27
Answer :-D. 1 : 27
Q.43. When forward bias is applied to a p-n junction, then what happens to the potential barrier (VB) and the width (X) of the depletion region?
A. VB increase, X decreases
B. VB decreases, X increase
C. VB increase, X increase
D. VB decreases, X decreases
Answer :- D. VB decreases, X decreases
Q.44. Two inductors of 60 mH each are joined in parallel. The current passing through this combination is 2.2 A. The energy stored in this combination of inductors in joule is
A. 0.0333
B. 0.0667
C. 0.0726
D. 0.0984
Answer :- C. 0.0726
Q.45. A beam of light is incident on a glass plate at an angle of 60∘. The reflected ray is polarized. If angle of incidence is 45∘ then angle of refraction is
A. sin^{-1}\left ( \frac{1}{\sqrt{6}} \right )
B. sin^{-1}\left ( \frac{1}{\sqrt{3}} \right )
C. sin^{-1}\left ( \sqrt{ \frac{3}{2} } \right )
D. cos^{-1}\left ( \sqrt{ \frac{3}{2} } \right )
Answer :- A. sin^{-1}\left ( \frac{1}{\sqrt{6}} \right )
Q.46. Consider a light planet revolving around a massive star in a circular orbit of radius ‘r’ with time period ‘T’. If the gravitational force of attraction between the planet and the star is proportional to r7/2, then T2 is proportional to
A. r9/2
B. r7/2
C. r5/2
D. r3/2
Answer :- A. r9/2
Q.47. A potentiometer wire has length of 5 m and resistance of 16Ω. The driving cell has an e.m.f. of 5 V and an internal resistance of 4Ω. When the two cells of e.m.f.s 1.3 V and 1.1 V are connected so as to assist each other and then oppose each other, the balancing lengths are respectively
A. 3 m,0.25 m
B. 0.25 m,3 m
C. 2.5 m,0.3 m
D. 0.3 m,2.5 m
Answer :- A. 3 m,0.25 m
Q.48. Four massless springs whose force constants are 2 K,2 K, K and 2 K respectively are attached to a mass M kept on a frictionless plane as shown in figure, If mass M is displaced in horizontal direction then frequency of oscillating system is
A. \frac{1}{2\pi }\sqrt{\frac{K}{4M}}
B. \frac{1}{2\pi }\sqrt{\frac{4K}{M}}
C. \frac{1}{2\pi }\sqrt{\frac{K}{7M}}
D. \frac{1}{2\pi }\sqrt{\frac{7K}{M}}
Answer :- B. \frac{1}{2\pi }\sqrt{\frac{4K}{M}}
Q.49. About black body radiation, which of the following is the wrong statement?
A. For all wavelengths, intensity is same.
B. For shorter wavelengths, intensity is more.
C. For longer wavelengths, intensity is less.
D. All wavelengths are emitted by a black body.
Answer :- A. For all wavelengths, intensity is same.
Q.50. Two coils have a mutual inductance of 0.004 H. The current changes in the first coil according to equation I=I0sinωt, where I0=10 A and ω=50 π rad s−1. The maximum value of e.m.f. in the second coil in volt is
A. 5π
B. 4π
C. 2.5π
D. 2π
Answer :- D. 2π
Chemistry
Q.1. Find [OH] if a monoacidic base is 3% ionised in its 0.04 M solution.
A. 3.1×10−2 mol L−1
B. 4.5×10−3 mol L−1
C. 9.0×10−2 mol L−1
D. 1.2×10−3 mol L−1
Answer :- D. 1.2×10−3 mol L−1
Q.2. Calculate ΔG∘ for the reaction Mg(s) +Sn(aq)++⟶Mg(aq)++ + Sn(s) if cell Ecell 0 is 2.23 V.
A. −430.4 kJ
B. 215.2 kJ
C. 645.6 kJ
D. −860.8 kJ
Answer :- A. −430.4 kJ
Q.3. If lattice enthalpy and hydration enthalpy of KCl are 699 kJ mol−1 and −681.8 kJ mol−1 respectively. What is the enthalpy of solution of KCl ?
A. 8.20 kJ mol−1
B. 10.25 kJ mol−1
C. 13.80 kJ mol−1
D. 17.20 kJ mol−1
Answer :- D. 17.20 kJ mol−1
Q.4. Which of the following compounds does NOT undergo Williamson’s synthesis?
A. C2H5 – Cl
B.
C. C6H5– Cl
D. CH3-CH2-CH2-Cl
Answer :- C. C6H5– Cl
Q.5. What is the expression for solubility product of silver chromate if it’s solubility is expressed as S mol L−1 ?
A. 2 S2
B. 3 S3
C. 4 S3
D. 27 S4
Answer :- C. 4 S3
Q.6. Which from following is a non-ferrous alloy?
A. Nickel steel
B.Chromium steel
C. Stainless steel
D. Brass
Answer :- D. Brass
Q.7. What are the number of octahedral and tetrahedral voids in 0.3 mole substance respectively if it forms hcp structure?
A. 1.8066×1023 and 3.6132×1023
B. 3.6132×1023 and 1.8066×1023
C. 6.022×1023 and 12.044×1023
D. 12.044×1023 and 6.022×1023
Answer :- A. 1.8066×1023 and 3.6132×1023
Q.8. Calculate the molar mass of an element having density 7.8 g cm−3 that forms bcc unit cell. [a3⋅NA=16.2 cm3 mol−1]
A. 63.18 g mol−1
B. 61.23 g mol−1
C. 59.31 g mol−1
D. 65.61 g mol−1
Answer :- A. 63.18 g mol−1
Q.9. Which among the following compounds exhibits +2 oxidation state of oxygen?
A. H2O
B. SO2
C. OF2
D. H2O2
Answer :- C. OF2
Q.10. Identify substrate A in the following reaction.
A\;+\;AgOH\xrightarrow[{ii)\;\triangle}]{i)\;moist\;Ag_2O}CH_3CH_2N{(CH_3)}_2+CH_2=\;CH_2A. Diethylmethyl ammonium halide
B. Ethyltrimethyl ammonium halide
C. Diethyldimethyl ammonium hydroxide
D. Ethyltrimethyl ammonium hydroxide
Answer :- A. Diethylmethyl ammonium halide
Q.11. What volume of CO2( g) at STP is obtained by complete combustion of 6 g carbon?
A. 22.4 dm3
B. 11.2 dm3
C. 5.6 dm3
D. 2.24 dm3
Answer :- B. 11.2 dm3
Q.12. Identify the chiral molecule from the following.
A. 2-Iodopropane
B. 2-Iodo-2-methylbutane
C. 2-lodo-3-methylbutane
D. 3-Iodopentane
Answer :- C. 2-lodo-3-methylbutane
Q.13. Calculate the time needed for reactant to decompose 99.9% if rate constant of first order reaction is 0.576 minute−1.
A. 8 minutes
B. 12 minutes
C. 16 minutes
D. 20 minutes
Answer :- B. 12 minutes
Q.14. What is the number of moles of sp3 hybrid carbon atoms in one mole of 2-Methylbut-2-ene?
A. Four
B. Three
C. Two
D. One
Answer :- B. Three
Q.15. Identify major product A in following reaction.
3-Bromo-2-methylpen\tan e\;\xrightarrow[\triangle]{alc.\;KOH}AA. 2- Methylpentane-3-ol
B. 2- Methylpent-2-ene
C. 4-Methylpent-3-ene
D. 4-Methylpentan-3-ol
Answer :- B. 2- Methylpent-2-ene
Q.16. For reaction, CO_{(g)}+\frac12O_{2_{(g)}}\rightarrow CO_{2(g)}
Which of the following equations is CORRECT at constant T and P ?
A. ΔH<ΔU
B. ΔH>ΔU
C. ΔH=ΔU
D. ΔH=0
Answer :- A. ΔH<ΔU
Q.17. Identify the example of zero-dimensional nanostructure from following.
A.Nanotubes
B. Fibres
C. Thin films
D. Quantum dots
Answer :- D. Quantum dots
Q.18. What is pH of solution containing 50 mL each of 0.1 M sodium acetate and 0.01 M acetic acid? (pKaCH3COOH=4.50)
A. 2.5
B. 3.5
C. 4.5
D. 5.5
Answer :- D. 5.5
Q.19. Calculate amount of methane formed by liberation of 149.6 kJ of heat using following equation.
C(s)+2H2( g)⟶CH4( g)ΔH=−74.8 kJ/mol
A.16 g
B. 24 g
C. 32 g
D. 48 g
Answer :- C. 32 g
Q.20. Which from following polymers is used to obtain tyre cords?
A. Nylon 6
B. Polyacrylonitrile
C. Bakelite
D. Terylene
Answer :- A. Nylon 6
Q.21. Electrolytic cells containing Zn and Al salt solutions are connected in series. If 6.5 g of Zn is deposited in one cell calculate mass of Al deposited in second cell (molar mass : Zn=65,Al=27 ) by passing definite quantity of electricity?
A. 2.4 g
B. 2.1 g
C. 2.7 g
D. 1.8 g
Answer :- D. 1.8 g
Q.22. What type of glycosidic linkages are present in cellulose?
A. β−1,6
B. β−1,4
C. α−1,6
D. α−1,4
Answer :- B. β−1,4
Q.23. Calculate the rate constant of first order reaction if half life of reaction is 40 minutes.
A. 1.733×10−2 minute −1
B. 1.951×10−2 minute −1
C. 1.423×10−2 minute −1
D. 1.256×10−2 minute −1
Answer :- A
Q.24. Identify product ‘B’ in following sequence of reactions.
2n\;Propanone\xrightarrow{Ba{(OH)}_2}A\;\xrightarrow[{-H_2O}]\triangle nBA. 4-Hydroxy-4-methylpentan-2-one
B. 2-Methylpentan-3-one
C. 2-Methylpent-2-en-4-one
D. 4-Methylpent-3-en-2-one
Answer :-D. 4-Methylpent-3-en-2-one
Q.25. Identify rate law expression for 2NO(g)+Cl2( g)→2NOCl(g) if the reaction is second order in NO and first order in Cl2.
A. Rate =k[NO]2[Cl2]
B. Rate =k[NO][Cl2]
C. Rate=k[NO]2
D. Rate =k[Cl2]
Answer :- A. Rate =k[NO]2[Cl2]
Q.26. Which among the following solutions has minimum boiling point elevation?
A. 0.1 m NaCl
B. 0.2 m KNO3
C. 0.1 m Na2SO4
D. 0.05 m CaCl2
Answer :- D. 0.05 m CaCl2
Q.27. Calculate osmotic pressure of solution of 0.025 mole glucose in 100 mL water at 300 K. [R=0.082 atmdmmol−1 K−1]
A. 1.54 atm
B. 2.05 atm
C. 6.15 atm
D. 3.08 atm
Answer :- C. 6.15 atm
Q.28. Which from following is a neutral ligand?
A. Aqua
B. Sulphato
C. Carbonato
D. Bromo
Answer :- A. Aqua
Q.29. How many isomers of C4H11 N are tertiary amines?
A. One
B. Two
C. Three
D. Four
Answer :- A. One
Q.30. Which element from following exhibits diagonal relationship with Mg ?
A. Be
B. Li
C. Na
D. B
Answer :- B. Li
Q.31. Identify the good conductor of electricity from following band gap energy values of solids.
| Solid | E gap |
| A | 5.47 eV |
| B | 0.0 eV |
| C | 1.12 eV |
| D | 0.67 eV |
A. A
B. B
C. C
D. D
Answer :- B. B
Q.32. Identify the product obtained when ethoxybenzene reacts with hot and concentrated HI.
A. Ethyl iodide and Phenol
B. Ethyl alcohol and Phenol
C. Ethyl alcohol and Iodobenzene
D. Ethyl iodide and Iodobenzene
Answer :- A. Ethyl iodide and Phenol
Q.33. Identify thermosetting polymer from following
A. Urea formaldehyde resin
B. Polythene
C. Polystyrene
D. Polyvinyls
Answer :- A. Urea formaldehyde resin
Q.34. Which from following phenomena is inversely proportional with adsorption?
A. Critical temperature of gas
B. Surface area of adsorbent
C. Temperature of process
D. Pressure of gas
Answer :- C. Temperature of process
Q.35. Calculate the frequency of blue light having wavelength 440 nm.
A. 6.82×1014 Hz
B. 7.5×1014 Hz
C. 4.0×1014 Hz
D. 5.26×1014 Hz
Answer :- A. 6.82×1014 Hz
Q.36. Which from following elements is NOT radioactive?
A. At
B Po
C. Rn
D. Ar
Answer :- D. Ar
Q.37. Which from following is strongest reducing agent?
A. K
B. Al
C. Mg
D. Ag
Answer :- A. K
Q.38. What is the numerical value of spin only magnetic moment of copper in +2 state?
A. 0.0
B. 1.73
C. 2.78
D. 4.4
Answer :- B. 1.73
Q.39. Identify the element having highest density from following.
A. O
B. S
C. Se
D. Te
Answer :- D. Te
Q.40. What is the shape of AB4E type of molecule according to VSEPR?
A. See saw
B. Bent
C. Trigonal pyramidal
D. T shape
Answer :- A. See saw
Q.41. The molecular formula of hexachlorobenzene is
A. C6H6Cl6
B. C6Cl6
C. C6H5Cl
D. C6H6Cl
Answer :-B. C6Cl6
Q.42. What is the value of specific rotation exhibited by fructose molecule?
A. +52.7∘
B. −92.4∘
C. +66.5∘
D. −40.3∘
Answer :- B. −92.4∘
Q.43. Which of the following reactions is Rosenmund reduction?
A.
B.
C.
D.
Answer :- A
Q.44. Which from following complexes contains only anionic ligands?
A. Tetraamminedibromoplatinum (IV) bromide
B. Potassium trioxalatoaluminate (III)
C. Pentaaquaisothiocyanatoiron (III) ion
D. Pentaammineaquacobalt (III) iodide
Answer :- B.Potassium trioxalatoaluminate (III)
Q.45. A hot air balloon has volume of 2000 dm3 at 99∘C. What is the new volume if air in balloon cools to 80∘C ?
A. 2428.9 dm3
B. 2656.9 dm3
C. 2814.9 dm3
D. 1897.8 dm3
Answer :- D. 1897.8 dm3
Q.46. Identify the product obtained in following reaction.
CH_3MgI+H_2O\;\xrightarrow{dry\;ether}productA. n MgI and n CH4
B. \frac{n}{2} C2H6
C. n CH3OH and n MgI
D. n CH4 and n MgI(OH)
Answer :- D. n CH4 and n MgI(OH)
Q.47. Which of following pairs is an example of isoelectronic species?
A. O−−;Na+
B. O−−;F
C. K;Ca++
D. Ar;Al+3
Answer :- A. O−−;Na+
Q.48. Which from following compounds is obtained when anisole is heated with dilute sulfuric acid?
A. Phenol and ethanol
B. Phenol and methanol
C. Pyrogallol and methanol
D. Phloroglucinol and ethanol
Answer :- B. Phenol and methanol
Q.49. Calculate molality of solution of a nonvolatile solute having boiling point elevation 1.89 K if boiling point elevation constant of solvent is 3.15 K kg mol−1.
A. 0.4 m
B. 0.8 m
C. 0.6 m
D. 0.3 m
Answer :- C. 0.6 m
Q.50. What type of following phenomena does the Cannizzaro reaction exhibit?
A. Nucleophilic addition
B. Elimination
C. Disproportionation
D. Decomposition
Answer :- C. Disproportionation