Practice MCQs - PCE Set 7

Physics

1. The dimensional formula of Planck's constant is identical to that of:

A.Angular momentumB.Linear momentumC.WorkD.Force

Physics

2. Two vectors of magnitudes $3$ and $4$ give a resultant of magnitude $1$[cite: 1]. What must be the angle between them?[cite: 1]

A.$0^\circ$B.$90^\circ$C.$180^\circ$D.$60^\circ$

Physics

3. The angle of projection for a projectile to have maximum horizontal range is:

A.$30^\circ$B.$45^\circ$C.$60^\circ$D.$90^\circ$

Physics

4. The centripetal force required to keep a body of mass '$m$' moving in a circular path of radius '$r$' with velocity '$v$' is:

A.$mv^2/r$B.$mv/r$C.$mr^2/v$D.$mv/r^2$

Physics

5. If the momentum of a body is doubled, its kinetic energy will become:

A.$2\text{ times}$B.$4\text{ times}$C.HalfD.Unchanged

Physics

6. The escape velocity from the surface of the Earth is approximately:

A.$11.2\text{ km/s}$B.$11.2\text{ m/s}$C.$8\text{ km/s}$D.$9.8\text{ m/s}$

Physics

7. The moment of inertia of a solid sphere of mass $M$ and radius $R$ about its diameter is:

A.$(2/5)MR^2$B.$(2/3)MR^2$C.$MR^2$D.$(1/2)MR^2$

Physics

8. Hooke's law is valid up to:

A.Yield pointB.Breaking pointC.Elastic limitD.Plastic limit

Physics

9. The time period of a simple pendulum on the surface of the moon, compared to Earth, will:

A.IncreaseB.DecreaseC.Remain the sameD.Become zero

Physics

10. In an isothermal process, which of the following remains constant?

A.PressureB.VolumeC.TemperatureD.Heat

Physics

11. A Carnot engine operates between temperatures $600\text{ K}$ and $300\text{ K}$. Its efficiency is:

A.$25\%$B.$50\%$C.$75\%$D.$100\%$

Physics

12. The speed of sound is maximum in:

A.SolidsB.LiquidsC.GasesD.Vacuum

Physics

13. The phenomenon of sound that explains the change in frequency due to relative motion is:

A.InterferenceB.DiffractionC.Doppler effectD.Polarization

Physics

14. Two point charges $+q$ and $-q$ are separated by a distance $d$. The dipole moment is:

A.$q/d$B.$qd$C.$q^2/d$D.$2qd$

Physics

15. Three capacitors of $3\ \mu\text{F}$ each are connected in parallel. Their equivalent capacitance is:

A.$1\ \mu\text{F}$B.$3\ \mu\text{F}$C.$6\ \mu\text{F}$D.$9\ \mu\text{F}$

Physics

16. Kirchhoff's first law (Junction rule) is based on the conservation of:

A.EnergyB.MomentumC.ChargeD.Mass

Physics

17. The magnetic field at the center of a circular coil of radius $r$ carrying current $I$ is proportional to:

A.$I/r$B.$Ir$C.$I/r^2$D.$I^2/r$

Physics

18. A charged particle moving parallel to a uniform magnetic field experiences a force of:

A.$qvB$B.$qvB/2$C.ZeroD.$qE$

Physics

19. According to Faraday's law, the induced emf in a circuit is equal to the rate of change of:

A.Magnetic fluxB.Electric fluxC.CurrentD.Voltage

Physics

20. In an AC circuit containing only a capacitor, the current:

A.Lags the voltage by $90^\circ$B.Leads the voltage by $90^\circ$C.Is in phase with voltageD.Lags by $180^\circ$

Physics

21. The critical angle for total internal reflection is minimum for:

A.Red lightB.Yellow lightC.Blue lightD.Violet light

Physics

22. In Young's double-slit experiment, if the distance between the slits is halved, the fringe width will:

A.HalveB.DoubleC.QuadrupleD.Remain unchanged

Physics

23. The energy of a photon of wavelength $\lambda$ is given by:

A.$hc/\lambda$B.$h\lambda/c$C.$h\lambda$D.$hc\lambda$

Physics

24. The maximum kinetic energy of emitted photoelectrons depends on:

A.Intensity of lightB.Frequency of lightC.Time of illuminationD.Area of the surface

Physics

25. In the Bohr model of the hydrogen atom, the angular momentum of an electron in the nth orbit is:

A.$nh/2\pi$B.$nh/\pi$C.$n^2h/2\pi$D.$h/2\pi n$

Physics

26. The half-life of a radioactive substance is $10\text{ days}$. The fraction remaining after $30\text{ days}$ is:

A.$1/2$B.$1/4$C.$1/8$D.$1/16$

Physics

27. Isotopes are atoms of the same element that have different:

A.Atomic numbersB.Numbers of protonsC.Numbers of electronsD.Mass numbers

Physics

28. A p-type semiconductor is formed by doping silicon with:

A.PhosphorusB.ArsenicC.BoronD.Antimony

Physics

29. The logic gate that gives a HIGH output only when all inputs are HIGH is:

A.OR gateB.AND gateC.NAND gateD.NOR gate

Physics

30. X-rays can be deflected by:

A.Electric fieldsB.Magnetic fieldsC.Both electric and magnetic fieldsD.Neither electric nor magnetic fields

Chemistry

31. The number of moles in $44\text{g}$ of $\mathrm{CO_2}$ is:

A.$0.5$B.$1.0$C.$1.5$D.$2.0$

Chemistry

32. The maximum number of electrons that can be accommodated in the 'd' subshell is:

A.$2$B.$6$C.$10$D.$14$

Chemistry

33. Which of the following principles states that no two electrons in an atom can have the same four quantum numbers?

A.Aufbau PrincipleB.Pauli Exclusion PrincipleC.Hund's RuleD.Heisenberg's Principle

Chemistry

34. At STP, the volume occupied by $1\text{ mole}$ of an ideal gas is:

A.$11.2\text{ L}$B.$22.4\text{ L}$C.$24.0\text{ L}$D.$44.8\text{ L}$

Chemistry

35. The heat of neutralization of a strong acid and a strong base is approximately:

A.$-13.7\text{ kcal}$B.$-57.1\text{ kcal}$C.Both a and bD.Neither a nor b

Chemistry

36. If the rate of reaction is independent of the concentration of reactants, the reaction is of:

A.Zero orderB.First orderC.Second orderD.Third order

Chemistry

37. An increase in temperature increases the rate of reaction primarily by:

A.Decreasing activation energyB.Increasing collision frequencyC.Increasing the number of effective collisionsD.Decreasing the enthalpy of reaction

Chemistry

38. According to Le Chatelier's principle, an increase in pressure on the system $\mathrm{N_2}(g) + 3\mathrm{H_2}(g) \rightleftharpoons 2\mathrm{NH_3}(g)$ will:

A.Shift the equilibrium backwardB.Shift the equilibrium forwardC.Have no effectD.Stop the reaction

Chemistry

39. The $\mathrm{pH}$ of a $10^{-3}\text{ M }\mathrm{HCl}$ solution is:

A.$1$B.$2$C.$3$D.$4$

Chemistry

40. The oxidation number of Chromium ($\mathrm{Cr}$) in $\mathrm{K_2Cr_2O_7}$ is:

A.$+2$B.$+4$C.$+6$D.$+7$

Chemistry

41. In a galvanic cell, oxidation occurs at the:

A.CathodeB.AnodeC.Salt bridgeD.Electrolyte

Chemistry

42. Which of the following elements has the highest electronegativity?

A.OxygenB.NitrogenC.FluorineD.Chlorine

Chemistry

43. The shape of a water molecule ($\mathrm{H_2O}$) according to VSEPR theory is:

A.LinearB.Trigonal planarC.TetrahedralD.Bent (V-shaped)

Chemistry

44. The hybridization of Carbon in Ethene ($\mathrm{C_2H_4}$) is:

A.$sp$B.$sp^2$C.$sp^3$D.$sp^3d$

Chemistry

45. Hydrogen bonding is strongest in:

A.$\mathrm{H_2O}$B.$\mathrm{NH_3}$C.$\mathrm{HF}$D.$\mathrm{HCl}$

Chemistry

46. The IUPAC name of $\mathrm{K_4[Fe(CN)_6]}$ is:

A.Potassium hexacyanoferrate(II)B.Potassium hexacyanoferrate(III)C.Potassium iron(II) cyanideD.Tetrapotassium hexacyanoiron

Chemistry

47. Bauxite is an ore of:

A.IronB.CopperC.AluminumD.Zinc

Chemistry

48. Which of the following compounds exhibits functional isomerism with ethanol?

A.PropanolB.Dimethyl etherC.AcetaldehydeD.Ethanoic acid

Chemistry

49. Addition of $\mathrm{HBr}$ to propene yields primarily:

A.1-BromopropaneB.2-BromopropaneC.1,2-DibromopropaneD.Propane

Chemistry

50. $\mathrm{S_N2}$ reactions are fastest in:

A.Primary alkyl halidesB.Secondary alkyl halidesC.Tertiary alkyl halidesD.Aryl halides

Chemistry

51. The reaction of benzene with methyl chloride in the presence of anhydrous $\mathrm{AlCl_3}$ is called:

A.Wurtz reactionB.Friedel-Crafts alkylationC.Cannizzaro reactionD.Aldol condensation

Chemistry

52. Which of the following is a test for aldehydes?

A.Lucas testB.Tollen's testC.Hinsberg testD.Iodoform test

Chemistry

53. Esters are characterized by their:

A.Sour tasteB.Pungent smellC.Fruity smellD.Bitter taste

Chemistry

54. Primary amines react with nitrous acid to form:

A.Secondary aminesB.Nitro compoundsC.Alcohols and nitrogen gasD.Diazo compounds

Chemistry

55. The monomer of Teflon is:

A.EtheneB.Vinyl chlorideC.TetrafluoroetheneD.Styrene

Chemistry

56. Which of the following is an essential amino acid?

A.GlycineB.AlanineC.ValineD.Serine

Chemistry

57. Glucose and Fructose are examples of:

A.Functional isomersB.Chain isomersC.Position isomersD.Optical isomers

Chemistry

58. The depletion of the ozone layer is primarily caused by:

A.$\mathrm{CO_2}$B.$\mathrm{SO_2}$C.Chlorofluorocarbons (CFCs)D.Methane

Chemistry

59. Aspirin is a common name for:

A.Salicylic acidB.Acetylsalicylic acidC.Methyl salicylateD.Phenol

Chemistry

60. Which metal is present in Vitamin B12?

A.IronB.MagnesiumC.CobaltD.Zinc

English

Reading Passage:

The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of information. Before this, books were painstakingly copied by hand, making them rare and expensive. Gutenberg's movable type allowed for mass production, drastically reducing the cost of books and making them accessible to a broader public. This shift played a crucial role in the Renaissance and the Scientific Revolution, as ideas could now cross borders faster than ever before. However, it also alarmed authorities who feared the uncontrolled spread of dissenting ideas.

61. According to the passage, what made books rare before Gutenberg's invention?

A.They were banned by the government.B.They were painstakingly copied by hand.C.People did not know how to read.D.The materials used were extremely fragile.

English

Reading Passage:

The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of information. Before this, books were painstakingly copied by hand, making them rare and expensive. Gutenberg's movable type allowed for mass production, drastically reducing the cost of books and making them accessible to a broader public. This shift played a crucial role in the Renaissance and the Scientific Revolution, as ideas could now cross borders faster than ever before. However, it also alarmed authorities who feared the uncontrolled spread of dissenting ideas.

62. The printing press contributed significantly to which of the following historical periods?

A.The Dark AgesB.The Industrial RevolutionC.The RenaissanceD.The Fall of the Roman Empire

English

Reading Passage:

The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of information. Before this, books were painstakingly copied by hand, making them rare and expensive. Gutenberg's movable type allowed for mass production, drastically reducing the cost of books and making them accessible to a broader public. This shift played a crucial role in the Renaissance and the Scientific Revolution, as ideas could now cross borders faster than ever before. However, it also alarmed authorities who feared the uncontrolled spread of dissenting ideas.

63. Why were authorities alarmed by the printing press?

A.It used dangerous chemicals.B.It caused mass unemployment among scribes.C.It threatened their religious beliefs.D.They feared the uncontrolled spread of dissenting ideas.

English

Reading Passage:

The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of information. Before this, books were painstakingly copied by hand, making them rare and expensive. Gutenberg's movable type allowed for mass production, drastically reducing the cost of books and making them accessible to a broader public. This shift played a crucial role in the Renaissance and the Scientific Revolution, as ideas could now cross borders faster than ever before. However, it also alarmed authorities who feared the uncontrolled spread of dissenting ideas.

64. The word 'revolutionized' in the passage is closest in meaning to:

A.DestroyedB.MaintainedC.TransformedD.Prevented

English

Reading Passage:

The invention of the printing press by Johannes Gutenberg in the 15th century revolutionized the spread of information. Before this, books were painstakingly copied by hand, making them rare and expensive. Gutenberg's movable type allowed for mass production, drastically reducing the cost of books and making them accessible to a broader public. This shift played a crucial role in the Renaissance and the Scientific Revolution, as ideas could now cross borders faster than ever before. However, it also alarmed authorities who feared the uncontrolled spread of dissenting ideas.

65. What is the primary focus of this passage?

A.A biography of Johannes GutenbergB.The process of manual book copyingC.The impact of the printing press on societyD.The censorship of books by authorities

English

66. Choose the correct synonym for 'CANDID':

A.DeceptiveB.FrankC.ConfusedD.Secretive

English

67. Choose the correct synonym for 'OBSOLETE':

A.ModernB.OutdatedC.PowerfulD.Efficient

English

68. Choose the correct synonym for 'MITIGATE':

A.AggravateB.RelieveC.IgnoreD.Confuse

English

69. Choose the correct synonym for 'METICULOUS':

A.CarelessB.SloppyC.CarefulD.Hasty

English

70. Choose the correct synonym for 'VIGILANT':

A.SleepyB.WatchfulC.CarelessD.Ignorant

English

71. Choose the correct antonym for 'ARROGANT':

A.ProudB.HumbleC.BoldD.Aggressive

English

72. Choose the correct antonym for 'ANCIENT':

A.OldB.ModernC.HistoricD.Primitive

English

73. Choose the correct antonym for 'DILIGENT':

A.HardworkingB.LazyC.ActiveD.Focused

English

74. Choose the correct antonym for 'ABUNDANT':

A.PlentifulB.ScarceC.RichD.Overflowing

English

75. Choose the correct antonym for 'OPTIMISTIC':

A.PositiveB.HopefulC.PessimisticD.Cheerful

English

76. Choose the antonym of: He is very good ________ mathematics.

A.inB.atC.withD.about

English

77. Choose the antonym of: I prefer coffee ________ tea.

A.thanB.toC.overD.from

English

78. Choose the antonym of: She was accused ________ stealing the money.

A.forB.withC.ofD.about

English

79. Choose the antonym of: The cat jumped ________ the table.

A.uponB.inC.overD.at

English

80. Choose the antonym of: We have been living here ________ 2010.

A.forB.sinceC.fromD.in

English

81. What is the meaning of: "Select the correct passive form: 'They are building a new hospital.'"

A.A new hospital is built by them.B.A new hospital is being built by them.C.A new hospital has been built by them.D.A new hospital was being built by them.

English

82. What is the meaning of: "Select the correct passive form: 'Shakespeare wrote Hamlet.'"

A.Hamlet was written by Shakespeare.B.Hamlet is written by Shakespeare.C.Hamlet had been written by Shakespeare.D.Hamlet has been written by Shakespeare.

English

83. What is the meaning of: "Select the correct active form: 'The car was repaired by the mechanic.'"

A.The mechanic repairs the car.B.The mechanic has repaired the car.C.The mechanic repaired the car.D.The mechanic had repaired the car.

English

84. What is the meaning of: "Select the correct passive form: 'Close the door.'"

A.The door is closed.B.Let the door be closed.C.The door was closed.D.You are ordered to closed the door.

English

85. What is the meaning of: "Select the correct indirect speech: He said, 'I am going to the market.'"

A.He said that he is going to the market.B.He said that he was going to the market.C.He says that he was going to the market.D.He said that I was going to the market.

English

86. Choose the correct word for: Select the correct indirect speech: She said to me, 'Do you like tea?'

A.She asked me if I liked tea.B.She told me if I like tea.C.She asked me that do I like tea.D.She asked me if I like tea.

English

87. Choose the correct word for: Select the correct indirect speech: 'Please help me,' the beggar said to him.

A.The beggar told him to please help him.B.The beggar ordered him to help him.C.The beggar requested him to help him.D.The beggar asked him that he should help him.

English

88. Choose the correctly spelt word:

A.NeccessaryB.NecessaryC.NecesaryD.Neccesary

English

89. Choose the correctly spelt word:

A.EmbarrassB.EmbarasC.EmbaressD.Embarass

English

90. Choose the most appropriate word to fill in the blank: The sudden noise ________ the sleeping baby.

A.amazedB.startledC.amusedD.excited