Group C: Physics
51. The dimensions of the light-year are:
Correct Answer: A. [L]
Explanation: A light-year is the distance light travels in one year, so its dimension is length, [L].
Explanation: A light-year is the distance light travels in one year, so its dimension is length, [L].
52. Which of the following quantities remains constant for a body moving with a constant speed in a horizontal circle?
Correct Answer: D. K.E.
Explanation: In uniform circular motion, speed is constant, so kinetic energy (K.E. = ½mv²) remains constant. Velocity and acceleration change direction constantly.
Explanation: In uniform circular motion, speed is constant, so kinetic energy (K.E. = ½mv²) remains constant. Velocity and acceleration change direction constantly.
53. To stop a rigid body from rotating about an axis, we have to apply:
Correct Answer: C. Torque
Explanation: Torque, the rotational equivalent of force, is required to stop a rotating body by producing angular deceleration.
Explanation: Torque, the rotational equivalent of force, is required to stop a rotating body by producing angular deceleration.
54. Shearing strain is expressed by:
Correct Answer: B. Angle of shear
Explanation: Shearing strain is the angular deformation (angle of shear) caused by tangential stress, measured in radians.
Explanation: Shearing strain is the angular deformation (angle of shear) caused by tangential stress, measured in radians.
55. The water meniscus in contact with air in a capillary tube is:
Correct Answer: A. Concave
Explanation: Water forms a concave meniscus in a capillary tube due to its strong adhesive forces with glass, causing capillary rise.
Explanation: Water forms a concave meniscus in a capillary tube due to its strong adhesive forces with glass, causing capillary rise.
56. Which of the following thermometers is used to measure the temperature of the Sun?
Correct Answer: B. Pyrometer
Explanation: A pyrometer measures high temperatures, like that of the Sun, by analyzing emitted radiation, unlike other thermometers suited for lower temperatures.
Explanation: A pyrometer measures high temperatures, like that of the Sun, by analyzing emitted radiation, unlike other thermometers suited for lower temperatures.
57. Water has a minimum volume at:
Correct Answer: C. 4°C
Explanation: Water has maximum density and minimum volume at 4°C due to its unique density-temperature behavior.
Explanation: Water has maximum density and minimum volume at 4°C due to its unique density-temperature behavior.
58. The efficiency of a Carnot’s engine working between 1000K and 300K is:
Correct Answer: D. 70%
Explanation: Carnot efficiency = 1 - (T2/T1) = 1 - (300/1000) = 0.7 or 70%.
Explanation: Carnot efficiency = 1 - (T2/T1) = 1 - (300/1000) = 0.7 or 70%.
59. The twinkling of stars in the sky is due to:
Correct Answer: B. Refraction
Explanation: Twinkling occurs due to atmospheric refraction, as air layers of varying density bend starlight irregularly.
Explanation: Twinkling occurs due to atmospheric refraction, as air layers of varying density bend starlight irregularly.
60. For which of the following colors is the maximum angle of deviation for a prism?
Correct Answer: B. Violet
Explanation: Violet light, with the shortest wavelength, experiences the maximum deviation in a prism due to higher refractive index.
Explanation: Violet light, with the shortest wavelength, experiences the maximum deviation in a prism due to higher refractive index.
61. The S.I. unit of the universal gas constant is:
Correct Answer: A. JK-1mol-1
Explanation: The universal gas constant (R) has the unit J/(K·mol), derived from the ideal gas law PV = nRT.
Explanation: The universal gas constant (R) has the unit J/(K·mol), derived from the ideal gas law PV = nRT.
62. A long-sighted person uses spectacles fitted with:
Correct Answer: D. Convex lenses
Explanation: Long-sightedness (hyperopia) is corrected with convex lenses, which converge light to focus images on the retina.
Explanation: Long-sightedness (hyperopia) is corrected with convex lenses, which converge light to focus images on the retina.
63. The distance traveled by light in one year is called:
Correct Answer: C. Light year
Explanation: A light year is the distance light travels in one year, approximately 9.46 × 1015 meters.
Explanation: A light year is the distance light travels in one year, approximately 9.46 × 1015 meters.
64. Velocity of sound in a vacuum is:
Correct Answer: A. Zero
Explanation: Sound requires a medium to propagate. In a vacuum, there is no medium, so the velocity of sound is zero.
Explanation: Sound requires a medium to propagate. In a vacuum, there is no medium, so the velocity of sound is zero.
65. Buzzing of a mosquito is:
Correct Answer: A. Shrill sound
Explanation: Mosquito buzzing is a high-pitched, shrill sound due to the rapid vibration of their wings.
Explanation: Mosquito buzzing is a high-pitched, shrill sound due to the rapid vibration of their wings.
66. The credit for the discovery of the thermo-electric effect goes to:
Correct Answer: A. Seebeck
Explanation: The thermoelectric effect, where a temperature difference generates voltage, was discovered by Thomas Seebeck (Seebeck effect).
Explanation: The thermoelectric effect, where a temperature difference generates voltage, was discovered by Thomas Seebeck (Seebeck effect).
67. The forces responsible to hold the electrons in an atom are:
Correct Answer: B. Coulomb forces
Explanation: Electrons are held in an atom by Coulomb (electrostatic) forces between the negatively charged electrons and the positively charged nucleus.
Explanation: Electrons are held in an atom by Coulomb (electrostatic) forces between the negatively charged electrons and the positively charged nucleus.
68. The ground state energy of a hydrogen atom is:
Correct Answer: A. 13.6 eV
Explanation: The ground state energy of a hydrogen atom (n=1) is -13.6 eV, the energy required to ionize the electron.
Explanation: The ground state energy of a hydrogen atom (n=1) is -13.6 eV, the energy required to ionize the electron.
69. 1 atomic mass unit is equal to:
Correct Answer: C. 1/12 (mass of one C atom)
Explanation: 1 atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12 atom.
Explanation: 1 atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12 atom.
70. The process used in the atom bomb is:
Correct Answer: B. Fission
Explanation: Atom bombs rely on nuclear fission, where heavy nuclei (e.g., uranium-235) split, releasing energy.
Explanation: Atom bombs rely on nuclear fission, where heavy nuclei (e.g., uranium-235) split, releasing energy.
71. The energy stored in a charged capacitor is in the form of:
Correct Answer: B. Potential energy
Explanation: A charged capacitor stores energy as electric potential energy, given by E = ½CV².
Explanation: A charged capacitor stores energy as electric potential energy, given by E = ½CV².
72. The direction of the magnetic field produced by a straight conductor carrying current is given by:
Correct Answer: D. Right-hand thumb rule
Explanation: The right-hand thumb rule determines the magnetic field direction around a current-carrying conductor.
Explanation: The right-hand thumb rule determines the magnetic field direction around a current-carrying conductor.
73. The most accepted theory about the origin of the Universe is:
Correct Answer: A. Big-bang theory
Explanation: The Big Bang theory, supported by cosmic microwave background and redshift evidence, is the most accepted model for the Universe’s origin.
Explanation: The Big Bang theory, supported by cosmic microwave background and redshift evidence, is the most accepted model for the Universe’s origin.
74. For wattless current in an a.c. circuit, the phase difference between current and voltage must be:
Correct Answer: B. π/2
Explanation: Wattless current occurs when the phase difference is π/2, as power (P = VIcosφ) is zero when cos(π/2) = 0.
Explanation: Wattless current occurs when the phase difference is π/2, as power (P = VIcosφ) is zero when cos(π/2) = 0.
75. Which substance is used to make a permanent magnet?
Correct Answer: A. Ferromagnetic
Explanation: Ferromagnetic materials (e.g., iron, cobalt) retain magnetization, making them suitable for permanent magnets.
Explanation: Ferromagnetic materials (e.g., iron, cobalt) retain magnetization, making them suitable for permanent magnets.
Group D: English + Aptitude Test
76. Something that causes no harm:
Correct Answer: B. Innocuous
Explanation: Innocuous means harmless or not causing injury, unlike injurious (harmful) or panacea (cure-all).
Explanation: Innocuous means harmless or not causing injury, unlike injurious (harmful) or panacea (cure-all).
77. Something that cannot be grasped by mind:
Correct Answer: C. Intangible
Explanation: Intangible refers to something abstract that cannot be grasped by the mind or physically touched.
Explanation: Intangible refers to something abstract that cannot be grasped by the mind or physically touched.
78. One who rides in horse races, esp. professionally:
Correct Answer: C. Jockey
Explanation: A jockey is a professional horse race rider, while equestrian refers to a rider in general.
Explanation: A jockey is a professional horse race rider, while equestrian refers to a rider in general.
79. A heavy unnatural slumber:
Correct Answer: D. Stupor
Explanation: Stupor is a state of heavy, unnatural slumber or reduced consciousness, unlike coma (deeper unconsciousness).
Explanation: Stupor is a state of heavy, unnatural slumber or reduced consciousness, unlike coma (deeper unconsciousness).
80. To repeat word for word:
Correct Answer: C. Verbatim
Explanation: Verbatim means repeating something exactly word for word, unlike verbose (wordy).
Explanation: Verbatim means repeating something exactly word for word, unlike verbose (wordy).
81. Anything that destroys the effects of poison:
Correct Answer: A. Antidote
Explanation: An antidote neutralizes or counteracts a poison, unlike antibiotics (for infections) or antiseptics (for disinfection).
Explanation: An antidote neutralizes or counteracts a poison, unlike antibiotics (for infections) or antiseptics (for disinfection).
82. A person who totally abstains from alcoholic drinks:
Correct Answer: B. Teetotaller
Explanation: A teetotaller abstains completely from alcohol, unlike a vegetarian (avoids meat) or hedonist (seeks pleasure).
Explanation: A teetotaller abstains completely from alcohol, unlike a vegetarian (avoids meat) or hedonist (seeks pleasure).
83. A person in the habit of continuous talking:
Correct Answer: C. Loquacious
Explanation: Loquacious describes someone who talks continuously, unlike tongue-tied (speechless).
Explanation: Loquacious describes someone who talks continuously, unlike tongue-tied (speechless).
84. A person who is hard to please:
Correct Answer: C. Fastidious
Explanation: Fastidious refers to someone hard to please due to high standards, unlike taciturn (silent) or epicure (food enthusiast).
Explanation: Fastidious refers to someone hard to please due to high standards, unlike taciturn (silent) or epicure (food enthusiast).
85. To atone for one’s sins:
Correct Answer: D. Expiate
Explanation: Expiate means to atone or make amends for sins, while propitiate means to appease.
Explanation: Expiate means to atone or make amends for sins, while propitiate means to appease.
86. A person who cannot be subdued or conquered:
Correct Answer: C. Indomitable
Explanation: Indomitable means unconquerable or unyielding, unlike infallible (error-free) or inscrutable (mysterious).
Explanation: Indomitable means unconquerable or unyielding, unlike infallible (error-free) or inscrutable (mysterious).
87. Something that cannot be explained:
Correct Answer: B. Inexplicable
Explanation: Inexplicable means incapable of being explained, unlike mysterious (which may be explainable).
Explanation: Inexplicable means incapable of being explained, unlike mysterious (which may be explainable).
88. A place where young plants are reared:
Correct Answer: B. Nursery
Explanation: A nursery is a place where young plants are grown, unlike a kennel (for dogs) or poultry (for birds).
Explanation: A nursery is a place where young plants are grown, unlike a kennel (for dogs) or poultry (for birds).
89. A person who mends shoes:
Correct Answer: A. Cobbler
Explanation: A cobbler repairs shoes, while a shoeshine polishes them.
Explanation: A cobbler repairs shoes, while a shoeshine polishes them.
90. A man whose wife is dead:
Correct Answer: B. Widower
Explanation: A widower is a man whose wife has died, while a widow is a woman whose husband has died.
Explanation: A widower is a man whose wife has died, while a widow is a woman whose husband has died.
91. Book, picture, etc., produced merely to bring in money:
Correct Answer: C. Pot-boiler
Explanation: A pot-boiler is a work produced solely for financial gain, often of low quality.
Explanation: A pot-boiler is a work produced solely for financial gain, often of low quality.
92. Forensic examination of a dead body:
Correct Answer: B. Post-mortem
Explanation: A post-mortem is a forensic examination of a dead body to determine the cause of death.
Explanation: A post-mortem is a forensic examination of a dead body to determine the cause of death.
93. Musical or literary medley:
Correct Answer: B. Potpourri
Explanation: A potpourri is a medley or mixture of musical or literary works, unlike an extravaganza (elaborate show).
Explanation: A potpourri is a medley or mixture of musical or literary works, unlike an extravaganza (elaborate show).
94. A person who changes his religious beliefs:
Correct Answer: B. Renegade
Explanation: A renegade is someone who abandons their religious or political beliefs, while a heretic holds unorthodox beliefs.
Explanation: A renegade is someone who abandons their religious or political beliefs, while a heretic holds unorthodox beliefs.
95. A person who looks at the dark side of things:
Correct Answer: A. Pessimist
Explanation: A pessimist focuses on the negative or dark side, unlike an optimist (positive outlook).
Explanation: A pessimist focuses on the negative or dark side, unlike an optimist (positive outlook).
96. A place of shelter for ships:
Correct Answer: C. Harbour
Explanation: A harbour is a sheltered area for ships, while a port includes facilities for cargo handling.
Explanation: A harbour is a sheltered area for ships, while a port includes facilities for cargo handling.
97. A raised place on which offerings for a god are made:
Correct Answer: B. Altar
Explanation: An altar is a raised structure for religious offerings, unlike a church (place of worship).
Explanation: An altar is a raised structure for religious offerings, unlike a church (place of worship).
98. A person who sorrows for his sins:
Correct Answer: A. Penitent
Explanation: A penitent feels regret for their sins, unlike pious (devout) or sorrowful (generally sad).
Explanation: A penitent feels regret for their sins, unlike pious (devout) or sorrowful (generally sad).
99. Printed notice of somebody’s death:
Correct Answer: B. Obituary
Explanation: An obituary is a printed notice of someone’s death, often with a biography, unlike condolence (expression of sympathy).
Explanation: An obituary is a printed notice of someone’s death, often with a biography, unlike condolence (expression of sympathy).
100. The act of taking and passing off as one’s the ideas and writings, etc., of another:
Correct Answer: C. Plagiarism
Explanation: Plagiarism is the unethical act of using another’s work without credit, unlike adaptation (modifying with permission).
Explanation: Plagiarism is the unethical act of using another’s work without credit, unlike adaptation (modifying with permission).
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