RUHS BPT 2021 Question Paper

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RUHS Entrance Examination
2021
Question Paper
BPT 2021
Q. No. 1
The position vector of a particle is given by find out the velocity vector
0032001
of the particle.

Option A

Option B

Q. No. 2 The dimensional formula of magnetic flux is, [Given, mass=M, length=L, time=T,
0032002 current=A]

Option A [ML3T-2A-1]

Option B [ML2T-2A-2]

Option C [ML1T-3A-1]

Option D [ML2T-2A-1]

Q. No. 3 Moment of inertia of a rod of mass 'm' and length 'l' about its one end is 'I'. If one-
0032003 fourth of its length is cut away. Find out the moment of inertia of the remaining rod
about its one end.

Option A

Option B

Q. No. 4 Find out the height 'h' at which the value of 'g' becomes 1/49 of its value at the
0032004 surface of the earth. Given the radius of earth is 'R'.
Option A 3R
Option B 2R
Option C 6R

Option D 4R

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Q. No. 5 According to Kepler's law of planetary motion, if 'T' is the time-period and 'r' is the
0032005 orbital radius, then for two planets these are related as

Option A

Option B

Q. No. 6 An artificial satellite moves in a circular orbit around the earth. Total energy of the
0032006 satellite is given by 'E'. Find out the potential energy of the satellite.

Option A -2E
Option B 2E

Q. No. 7 A particle executing simple harmonic motion covers a distance equal to half its
0032007 amplitude in one second. Calculate the time period of the simple harmonic motion.
Option A 3s
Option B 4s
Option C 8s
Option D 12 s

Q. No. 8
0032008 A body oscillates with SHM according to the equation, Find out its
instantaneous displacement at t=1 sec. [Use S.I units]

Option A

Option B

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Q. No. 9
Young's modulus (Y) and rigidity modulus (G) for most of the materials is related as
0032009
Option A G=2Y

Option B

Q. No. 10 Water flows in a streamlined manner through a capillary tube of radius 'r' at the
0032010 pressure difference 'P' and at the rate of flow 'Q'. What will be the rate of flow if the
radius is reduced to 'r/2' and the pressure increased to '2P'.
Option A 2Q
Option B Q
Option C Q/4
Option D Q/8

Q. No. 11 If 1000 drops are combined to form a larger drop, then the ratio of surface energy of
0032011 smaller drop to the larger drop will be
Option A 1 : 10
Option B 1 : 1000
Option C 1 : 100
Option D 0.2 : 1

Q. No. 12 A gas with undergoes the adiabatic process of compression, if the pressure is
0032012 increased by 0.5%, then the volume decreased by
Option A 0.5%
Option B 1%

Option C 0.1%
Option D 0.25%

Q. No. 13 One mole of gas expands with temperature T such that its volume V=kT2 , where k is
0032013 a constant. If the temperature of the gas changes by 600C, Calculate the work done
by the gas.

Option A 120R
Option B R ln60

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Option C kR ln60
Option D 60kR

Q. No. 14 Two stars 'X' and 'Y' radiate maximum energy at the wavelength of 360 nm and 480
0032014 nm respectively. Then the ratio of the surface temperature of 'X' and 'Y' is

Option A 3:4

Option B 81:256
Option C 4:3

Option D 256:81

Q. No. 15 If 1 g of steam is mixed with 1 g of ice, then what will be the resultant temperature of
0032015 the mixture?

Option A 50oC

Option B 100o c

Option C 230o C

Option D 270o C

Q. No. 16 Find out the amplitude of a wave represented by displacement equation
0032016

Option A

Option B

Q. No. 17 Calculate the path difference between two
0032017

Option A

Option B

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Q. No. 18 If a closed organ pipe has the same third harmonic frequency as that of an open
0032018 organ pipe, then find out the ratio of their lengths.
Option A 4:5

Option B 3:4
Option C 1:2

Option D 1:1

Q. No. 19 Two condensers of capacity 0.3 F and 0.6 F respectively are connected in series. The
0032019 combination is connected is connected across a potential of 6V. The ratio of the
energies stored by the condensers will be
Option A 4:1

Option B 1:4
Option C 2:1

Option D 1:2

Q. No. 20
The dielectric constant of pure water is 81. Calculate the permittivity.
0032020

Option A 7.16*10-10 MKS unit

Option B 8.86*10-12 MKS unit

Option C 1.02*1013 MKS unit

Option D 4.36*1012 MKS unit

Q. No. 21 A capacitor of is charged to 200V and then plates of the capacitor are connected
0032021 to a resistance wire. Calculate the heat produced in joule unit

Option A 2*10-2

Option B 4*10-2

Option C 4*104

Option D 4*1010

Q. No. 22
The dimension of mobility of charge carriers. [given, M= mass, T=time, A= Current]
0032022

Option A M-2T2A

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Option B M-1T2A

Option C M2T-1A-1

Option D MT-2A-1

Q. No. 23 The magnetic induction produced at the centre of a circular loop carrying current is
0032023 'B'. The magnetic moment of the loop of radius 'R' is

Option A

Option B

Q. No. 24 If a steel wire of length 'L' and magnetic moment 'M' is bent into a semi-circular arc,
0032024 what will be the new magnetic moment

Option A MXL

Option B

Option D M

Q. No. 25 A proton and a Helium nucleus are shot into a magnetic field at right angles to the
0032025 field with the same kinetic energy. calculate the ratio of their radii.
Option A 1:1
Option B 1:2

Option C 2:1
Option D 1:4

Q. No. 26
What will happen if you heat a ferromagnetic substance above Curie temperature
0032026
Option A becomes paramagnetic
Option B becomes diamagnetic
Option C remains ferromagnetic

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Option D becomes electromagnetic

Q. No. 27 In an AC circuit, Voltage (V) and current (I) is given by, V=150sin(150t)V, and
0032027
. Calculate the power dissipation in the circuit.
Option A 2500 W
Option B 2430 W

Option C 5625 W
Option D 5650 W

Q. No. 28
0032028 The power factor of an R-L circuit is . If the frequency of the AC is doubled,
calculate the power factor

Option A

Option B

Q. No. 29 An air core coil and an electric bulb are connected in the series with an AC source. If
0032029 an iron rod is put in the coil, then the intensity of the bulb will be
Option A remain same
Option B increase

Option C decrease
Option D first decrease and then increase

Q. No. 30
The rms current in an AC circuit is 2 A. If the wattless current be A, what is the
0032030
power factor of the circuit?

Option A

Option B

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Q. No. 31 Which part of the electromagnetic spectrum is used to cook food?
0032031

Option A Ultraviolet rays
Option B X - rays
Option C Infrared rays
Option D Microwave rays

Q. No. 32 The ratio of contributions made by electric field and magnetic field components to the
0032032 intensity of an EM wave is
Option A c:1

Option B c2:1

Option C 1:1

Q. No. 33
The transverse nature of electromagnetic wave is proved by which of the following
0032033
Option A Interference phenomena

Option B Diffraction phenomena
Option C Dispersion phenomena
Option D Polarisation phenomena

Q. No. 34
The angle of minimum deviation for a glass prism with equals the refracting
0032034
angle of the prism. Calculate the angle of the prism.

Option A 300

Option B 600

Option C 450

Option D 650

Q. No. 35 A concave lens of focal length 'f' forms an image which is 1/3 times the size of the
0032035 object. Calculate the distance of the object from the lens.

Option A 2f
Option B 3f

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Q. No. 36 The diameter of the objective of a telescope is 200 cm. Calculate the resolving power
0032036 of the telescope. [Given, wavelength ]

Option A 3.28 X 105

Option B 3.28 X 106

Option C 1.5 X 106

Option D 1 X 106

Q. No. 37 In Young's double slit experiment, the locus of the point 'P' lying in a plane with a
0032037 constant path difference between two interfering waves is
Option A a hyperbola
Option B a straight line

Option C an ellipse
Option D a parabola

Q. No. 38 In Young's double slit experiment, the ratio of maximum and minimum intensities in
0032038 the fringe system is 9:1. The ratio of amplitudes of the coherent sources is

Option A 9:1
Option B 3:1
Option C 2:1
Option D 1:1

Q. No. 39 Sodium and copper have work functions 2.3 eV and 4.5 eV respectively. Then the ratio
0032039 of their threshold wavelengths is nearest to
Option A 1:2
Option B 2:1

Option C 1:4
Option D 4:1

Q. No. 40 Find out the maximum wavelength of light that can cause photoelectric effect in a
0032040 specific material whose work function is 2.5 eV. [given h=4.14*10-15 eV-s]

Option A 237 nm
Option B 749 nm
Option C 397 nm
Option D 497 nm

Q. No. 41 An electron of mass 'm' and photon have same energy 'E'. The ratio of the de-Broglie
0032041 wavelengths associated with them is [given, c= velocity of light]
Option A

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Option B

Q. No. 42
0032042 The wavelength of an electron and of a photon of same energy E are related
by

Option A

Option B

Q. No. 43
Which series of hydrogen spectrum corresponds to ultraviolet region?
0032043
Option A Balmer series

Option B Brackett series
Option C Paschen series
Option D Lyman series

Q. No. 44 In Bohr model of Hydrogen atom, the force on the electron depends on the principal
0032044 quantum number (n) as
Option A independent of n

Option B

Q. No. 45
The control rods used in a nuclear reactor can be made up of
0032045
Option A graphite

Option B cadmium
Option C lead
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Option D barium

Q. No. 46 The relationship between decay constant ' ' and half-life 'T' of a radioactive
0032046 substance is

Option A

Option B

Q. No. 47
Which one of the following is called the universal gate?
0032047
Option A OR gate
Option B NAND gate

Option C AND gate
Option D XOR gate

Q. No. 48 When a p-n junction is reversed, then the current through the junction is mainly due
0032048 to
Option A only diffusion charges
Option B neither drift nor diffusion charges
Option C both drift and diffusion charges

Option D only drift of charges

Q. No. 49 If the current gain ( ) of a transistor is 0.98, then what is the value of current gain (
0032049 ) of the transistor?
Option A 0.49

Option B 49
Option C 4.9
Option D 5

Q. No. 50
What is the value of in Boolean algebra
0032050
Option A A
Option B 0

Option C 1

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Q. No. 51
The -ve charged particles is called.
0062051
Option A Anion
Option B Cation

Option C Radical
Option D Atom

Q. No. 52
If 40g NaOH dissolve in 250ml water, then what is the molarity of the solution
0062052
Option A 4.0 M
Option B 5.0 M

Option C 8.0 M
Option D 6.0 M

Q. No. 53
The magnetic quantum number (m) specifies
0062053

Option A Size of orbitals
Option B Shape of orbitals
Option C Orientation of orbital
Option D Nuclear stability

Q. No. 54 From the following sets of quantum numbers n=3,l=2,m=-2,s=-1/2. Choose the
0062054 correct orbital
Option A 3s
Option B 3p
Option C 3d
Option D 3f

Q. No. 55
________ has the atomic number 52
0062055
Option A I
Option B Te

Option C Xe
Option D Br

Q. No. 56
Einsteinium is of which family element ?
0062056

Option A Actinides

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Option B Lanthanides
Option C Nobel gases
Option D Transition elements

Q. No. 57
Which of the following is paramagnetic?
0062057
Option A CO

Option B O2

Option C CN-

Option D NO+

Q. No. 58
Which one of the following has highest bond angle?
0062058

Option A CH4

Option B NH3

Option C H2O

Option D CO2

Q. No. 59
The states of matter that shows the uniformity of behaviour
0062059
Option A Gases
Option B Super cooled liquid
Option C Plasma
Option D Solids

Q. No. 60
The volume of 5.6g of carbon monoxide gas at 27oC and 0.0821 atm is
0062060
Option A 6L

Option B 60L
Option C 0.6L
Option D 3L

Q. No. 61
Best on the first law of thermodynamics, which one of the following is correct?
0062061
Option A For an isothermal process, q = +W

Option B For an isochoric process, U = -q

Option C For an adiabatic process, U = -W

Option D For acyclic process, q = -W

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Q. No. 62
Which orbital among the following has the highest energy?
0062062
Option A n = 4, l = 1

Option B n = 4, l = 0
Option C n = 3, l = 2
Option D n = 3, l = 1

Q. No. 63
Which of the following aqueous solution will have highest Ph?
0062063
Option A NaCl

Option B CH3COONa

Option C K2CO3

Option D NH4Cl

Q. No. 64
Solubility of Mg(OH)2 is S mol/L. Its Ksp is
0062064

Option A S2

Option B 2S2

Option C 4S2

Option D 4S3

Q. No. 65 The oxidation state of Cr in CrO5 is
0062065
Option A +6
Option B +8
Option C +5
Option D -5

Q. No. 66
H2O2 used in rocket has the concentration
0062066
Option A 50%
Option B 90%
Option C 70%
Option D 30%

Q. No. 67 Water shows anomalous behaviour between

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0062067

Option A 0o to -4oC

Option B 0o to 4oC

Option C 0o to 5oC

Option D 0o to 6oC

Q. No. 68
Solvays process used for the manufacture of
0062068
Option A NaOH

Option B (Na2CO3.10H2O)

Option C K2CO3

Option D NaO2

Q. No. 69
Carnallite is the mineral of
0062069
Option A Na
Option B Ca
Option C Mg
Option D Cu

Q. No. 70
Which of the ions are present in KHF2 ?
0062070

Option A K+, F-, H+

Option B K+, F-, HF-

Option C K+ and (HF2)-

Option D (KHF)+ and F-

Q. No. 71
0062071 this reaction is an example of

Option A Disproportionation Reaction
Option B Neutralisation Reaction
Option C PyroliticReaction

Option D Pyrolysis Reaction

Q. No. 72
Which of the following compound can form three types of salt?
0062072

Option A H3PO2

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Option B H3PO3

Option C H3PO4

Option D H3PO3

Q. No. 73 IUPAC name of
0062073

Option A 2-formylmethylcyclohexane-1,4-dicarbaldehyde

Option B (cyclohexan-2,5-dialyl)ethanol
Option C Cyclohexane-1,2,4-carbaldehyde
Option D Cyclohexane-2-formylmethyl-1,4-dial

Q. No. 74
The structure of 3-formylpentane-1,2-dioic acid is
0062074

Option A

Option B

Q. No. 75
Which of the following is aaromatic compound
0062075

Option A

Option B

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Q. No. 76
How many chloride ions are surrounding sodium ion in Sodium chloride?
0062076
Option A 4

Option B 8
Option C 6
Option D 12

Q. No. 77
Which of the following compound does not exhibit Frenkel defect?
0062077
Option A AgBr
Option B AgCl
Option C KBr
Option D ZnS

Q. No. 78
What is the packing efficiency of Body Centred Cubic unit cell ?
0062078
Option A 0.52
Option B 0.68
Option C 0.74

Option D 0.82

Q. No. 79
Which of the following solutions shows positive deviation from Raoult's law?
0062079
Option A Ethanol + Water

Option B Acetone + Chloroform
Option C Water + Nitric acid
Option D Pyridine + Acetic acid

Q. No. 80 Which of the following aqueous solution has highest value of depression of freezing
0062080 point?
Option A KCl

Option B C6H12O6

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Option C Al2(SO4)

Option D K2SO4

Q. No. 81 If 4 amp current passes through a acidified water for 30 min. Then what volume H2
0062081 gas will form in STP?
Option A 1100.84 ml
Option B 835.52 ml
Option C 1671.3 ml
Option D 927.4 ml

Q. No. 82 What time will required for the 99% completion of 1st order reaction, if rate constant
0062082 of the reaction is K
Option A t = 2.303/K
Option B t = 0.693/K
Option C t = 6.909/K
Option D t = 4.606/K

Q. No. 83 For the voltaic cell:
0062083

Option A 0.36V

Option B 0.63V
Option C 1.24V
Option D 2.48V

Q. No. 84
Kohlrausch's Law is applicable :
0062084
Option A To aqueous solution of strong electrolytes
Option B Applicable to electrolyte dissolved in a solvent of low polarity only
Option C To electrolytes at temperature above room temperature
Option D To electrolytic solution at infinite dilution

Q. No. 85
What is the chemical formula of 'Fool's gold? ?
0062085

Option A FeS2

Option B FeO2

Option C CrO3

Option D MnO2

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Q. No. 86
Which one of the following is emulsion ?
0062086
Option A Milk
Option B Gum
Option C Fog
Option D Blood

Q. No. 87
The formation of micelles take place only above
0062087
Option A Critical temperature
Option B Inversion temperature
Option C Absolute temperature
Option D Kraft temperature

Q. No. 88
What is the shape of XeO2F2 ?
0062088
Option A T-shape
Option B Bend shape

Option C See-saw
Option D Tetrahedral

Q. No. 89
What is the Effective Atomic Number (EAN) of [Fe(CN)6]3- ?
0062089
Option A 36
Option B 35
Option C 54
Option D 50

Q. No. 90
[Pt(NH3)2Cl2] what is the IUPAC name of the following compound?
0062090
Option A Diamminedichloridoplatinum(II)
Option B Diamminedichloridoplatinum(IV)
Option C Diamminedichloridoplatinum(0)
Option D Diamminedichloridoplatinum(IV)

Q. No. 91
0062091

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Which of the following statement is correct?
Option A Chiral molecule with R-Configuration

Option B Achiral molecule with R-Configuration
Option C Chiral molecule with S-Configuration
Option D Achiral molecule with S-Configuration

Q. No. 92
0062092

Option A

Option B

Q. No. 93 Which of the following alcohols will give the most stable carbocation during
0062093 dehydration?
Option A 2-butanol
Option B 2-methyl-1-butanol
Option C Butanol
Option D Methanol

Q. No. 94 Which of the following alcohols does not reacts with the Lucas Reagent?
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0062094

Option A CH3-CH2-CH2-OH

Option B (CH3)2CH-OH

Option C (CH3)3C-OH

Option D (CH3)2CH-CH2-OH

Q. No. 95
Which of the intermediate form in ReimerTiemann reaction?
0062095
Option A Nitrenes
Option B Carbene
Option C Ylides

Option D Carbocation

Q. No. 96
Which of the following does not give positive haloform reaction?
0062096

Option A

Option B

Q. No. 97
The S in Buna-S refers to
0062097

Option A Sulphur
Option B Styrene
Option C Sodium
Option D Silicon
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Q. No. 98
The two functional group present in typical carbohydrate are
0062098
Option A -CHO & -COOH

Option B -SO3H & -OH

Option C -OH & -CHO
Option D -OH & -COOH

Q. No. 99
The class of medicinal products used to treat stress is
0062099

Option A Analgesics
Option B Tranquillizers
Option C Antioxidants
Option D Antihistamines

Q. No. 100
Amides may be converted into amines by a reaction named after
0062100
Option A Hofmann Bromides
Option B Claisen
Option C Perkin
Option D Kekule

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