McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 501. |
A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image? |
| A. | 3 m |
| B. | 6 m |
| C. | 4.5 m |
| D. | None of these |
| Answer» B. 6 m | |
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Explanation: The image formed by a plane mirror is always virtual upright, and of the same shape and size as the object it is reflecting. A virtual image is a copy of an object formed at the location from which the light rays appear to come |
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| 502. |
Loudness of sound varies directly with vibrating body’s – |
| A. | Intensity |
| B. | Amplitude |
| C. | Pitch |
| D. | Quality |
| Answer» B. Amplitude | |
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Explanation: Loudness of Sound: Loudness of sound depends on amplitude of vibration. Loudness of sound is directly proportional to square of amplitude of vibration. |
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| 503. |
A thin oil film on a water surface appears coloured because of – |
| A. | reflection |
| B. | interference |
| C. | diffraction |
| D. | polarization |
| Answer» B. interference | |
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Explanation: A thin oil film on a water surface appears coloured because of thin-film interference which involves the interference of light waves reflecting off the top surface of a film with the waves reflecting from the bottom surface. |
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| 504. |
Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of : |
| A. | Modern periodic table |
| B. | Newland's law of octaves |
| C. | Dobereiner's triads |
| D. | Mendeleev's periodic table |
| Answer» B. Newland's law of octaves | |
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Explanation: Among the major limitations of Newlands Law of Octaves, some similar elements have been separated from one another while some dissimilar elements have been placed in the same column. |
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| 505. |
How much is the difference of time between any two Consecutive longitudes? |
| A. | 10min |
| B. | 14min |
| C. | 4 min |
| D. | 5:30 min |
| Answer» C. 4 min | |
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Explanation: The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0 degree), it would be 12:04 pm at 1 degree meridian and so on. |
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| 506. |
Which of the following modes of expressing concentration is independent of temperature - |
| A. | Molarity |
| B. | Molality |
| C. | Normality |
| D. | Formality |
| Answer» B. Molality | |
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Explanation: 0 |
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| 507. |
At boiling point of liquids, its – |
| A. | Temperature increases |
| B. | Atmospheric pressure increases |
| C. | Temperature remains constant |
| D. | Vapour pressure decreases |
| Answer» C. Temperature remains constant | |
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Explanation: An interesting property of matter is that its temperature remains constant during a phase change, assuming its surrounding pressure is constant. A liquid changes into gaseous state at a constant temperature called its boiling point. |
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| 508. |
Newton's first law is also known as . |
| A. | Law of Friction |
| B. | Law of Momentum |
| C. | Law of Inertia |
| D. | Law of Motion |
| Answer» C. Law of Inertia | |
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Explanation: Newton's first law of motion is also known as the law of inenrtia. It states that an object at rest stays at rest and an object inmotion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. |
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| 509. |
The humidity of air measured in percentage is called – |
| A. | absolute humidity |
| B. | specific humidity |
| C. | relative humidity |
| D. | all of these |
| Answer» C. relative humidity | |
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Explanation: The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density. |
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| 510. |
Who developed the theory of Evolution? |
| A. | Charles Darwin |
| B. | Isaac Newton |
| C. | Pranav Mistry |
| D. | Galileo Galilei |
| Answer» A. Charles Darwin | |
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Explanation: Summary of Darwin's Theory of Evolution: A species is a population of organisms that interbreeds and has fertile offspring. |
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| 511. |
Which of the following is an insulator? |
| A. | Mercury |
| B. | Carbon |
| C. | Germanium |
| D. | Glass |
| Answer» D. Glass | |
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Explanation: Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Some of the examples of insulators are: glass, plastic, rubber, porcelain, wood, ceramic, dry air, etc. |
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| 512. |
Name the process by which bubbles from liquid are formed? |
| A. | Effervescence |
| B. | Surface Tension |
| C. | Surface Energy |
| D. | Degasification |
| Answer» A. Effervescence | |
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Explanation: Effervescence is the escape of gas from an aqueous solution and the foaming or fizzing that results from a release of the gas. It leads to the formation of gas bubbles in a liquid. For example, when opening a bottle of champagne, beer or carbonated beverages such as soft drinks, the visible bubbles are produced by the escape from solution of the dissolved gas. |
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| 513. |
'Parsec' is the unit measurement of – |
| A. | Density of stars |
| B. | Astronomical distance |
| C. | Brightness of heavenly bodies |
| D. | Orbital velocity of giant stars |
| Answer» B. Astronomical distance | |
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Explanation: Parsec is a unit of distance used in astronomy to measure large distances to objects outside our Solar System. It is equal to about 3.26 light years (3.086 x 1013 kilometres). |
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| 514. |
The phenomenon of change in direction of light when it passes from one medium to another is called - |
| A. | Propagation |
| B. | Reflection |
| C. | Refraction |
| D. | Dispersion |
| Answer» C. Refraction | |
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Explanation: Refraction is the change in direction of wave propagation due to a change in its transmission medium. Due to the change of medium, the phase velocity of the wave is changed but its frequency remains constant. |
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| 515. |
The mercury and sodium street lamps light up because of – |
| A. | Atomic emission |
| B. | Atomic absorption |
| C. | Electron emission |
| D. | Electron absorption |
| Answer» A. Atomic emission | |
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Explanation: The light in sodium vapour lamp and mercury vapour lamp is, because of electron emission. In case of Sodium Lamps, filaments of the lamp sputter fast moving electrons, which hit the sodium atoms (vapour) causing the valence electrons of the sodium atoms to excite to higher energy levels and the electrons thus excited relax by emitting the characteristic monochromatic bright yellow light. |
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| 516. |
Who invented the Lightning Rod in 1749? |
| A. | Benjamin Franklin |
| B. | Nikola Tesla |
| C. | Eli Whitney |
| D. | George Washington |
| Answer» A. Benjamin Franklin | |
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Explanation: The principle of the lightning rod was first detailed by Benjamin Franklin in Pennsylvania in 1749. In the subsequent years, he developed his invention for household application (published in 1753) and further |
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| 517. |
When the milk is churned vigorously the cream from it is separated out clue to – |
| A. | Centripetal force |
| B. | Gravitational force |
| C. | Frictional force |
| D. | Centrifugal force |
| Answer» D. Centrifugal force | |
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Explanation: The separation of cream from milk is based on the fact that when liquids of different specific gravity revolve around the same centre at the same distance with the same velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk consists of two liquids of different specific gravity: fat and milk serum. |
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| 518. |
The temperature at which the catalytic activity of the catalyst is maximum, is called |
| A. | room temperature |
| B. | critical temperature |
| C. | absolute temperature |
| D. | optimum temperature |
| Answer» D. optimum temperature | |
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Explanation: 0 |
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| 519. |
Which one of the following non-metals is not a poor conductor of electricity? |
| A. | Sulphur |
| B. | Selenium |
| C. | Bromine |
| D. | Phosphorus |
| Answer» B. Selenium | |
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Explanation: Selenium is a non-metallic element; it is not a very good conductor of heat and electricity. |
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| 520. |
Which instrument is used to record Atmospheric pressure? |
| A. | Thermometer |
| B. | Barometer |
| C. | Seismometer |
| D. | Oscilloscope |
| Answer» B. Barometer | |
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Explanation: A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. A barometer using mercury is common. This is often recorded as mm Hg. |
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| 521. |
Full form of CFL used in place of electric bulbs is – |
| A. | compact fluorescent lamp |
| B. | constantan filament lamp |
| C. | closed filament lamp |
| D. | closed fluorescent lamp |
| Answer» A. compact fluorescent lamp | |
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Explanation: A compact fluorescent lamp (CFL) is a fluorescent lamp designed to replace an incandescent lamp; some types fit into light fixtures formerly used for incandescent lamps. |
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| 522. |
A light year is a unit of – |
| A. | time |
| B. | distance |
| C. | speed of light |
| D. | intensity of light |
| Answer» B. distance | |
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Explanation: As defined by the International. Astronomical Union (IAU), a light-year is the distance that light travels in a vacuum in one Julian year. It is a measure of distance (rather than, as is sometimes misunderstood, a measure of time). |
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| 523. |
An instrument that records earth- quakes is – |
| A. | Ergograph |
| B. | Ediograph |
| C. | Thermograph |
| D. | Seismograph |
| Answer» D. Seismograph | |
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Explanation: Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph. The earliestseismograph was invented in China A.D. 136 by a man named Choko. |
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| 524. |
An object is in static equilibrium when it is . |
| A. | at rest |
| B. | moving in a circular path |
| C. | moving with uniform velocity |
| D. | accelerating at high speed |
| Answer» A. at rest | |
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Explanation: 0 |
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| 525. |
The study of phenomena at very low temperatures is called - |
| A. | heat transfer |
| B. | morphology |
| C. | crystallography |
| D. | cryogenics |
| Answer» D. cryogenics | |
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Explanation: A person who studies elements that have been subjected to extremely cold temperatures is called a cryogenicist. |
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| 526. |
Steel is more elastic than rubber because it – |
| A. | requires larger deforming force |
| B. | Is never deformed |
| C. | is deformed very easily |
| D. | is harder than rubber |
| Answer» C. is deformed very easily | |
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Explanation: Elasticity is the capability of an object to return to its former shape once a load inducing strain is removed. Young Modulus or elastic modulus [tendency to be deformed elastically (i.e., nonpermanently) when a force is applied to it] of steel is more than that of rubber. |
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| 527. |
Which phenomena shows the particle nature of light? |
| A. | Diffraction |
| B. | Interference |
| C. | Photoelectric effect |
| D. | Polarisation |
| Answer» C. Photoelectric effect | |
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Explanation: The phenomena such as interference, diffraction, and polarization can only be explained when light is treated as a wave whereas photoelectric effect, line spectra, and the production and scattering of x rays demonstrate the particle nature of light. |
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| 528. |
In the names Mangifera indica (mango), Solanum tuberosum (potato) and Panthera leo (lion), the terms Mangifera, Solanum and Panthera represent the higher level of? |
| A. | Taxon |
| B. | Taxonomic Hierarchy |
| C. | Specific Epithet |
| D. | Binomial Nomenclature |
| Answer» A. Taxon | |
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Explanation: All the three names, indica, tuberosum and leo, represent the specific epithets while the first words Mangifera, Solanum and Panthera are genera and represents another higher level of taxon or category. |
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| 529. |
Sound waves in air are . |
| A. | transverse |
| B. | longitudinal |
| C. | electromagnetic |
| D. | polarised |
| Answer» B. longitudinal | |
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Explanation: Sound can propagate through compressible media such as air, water and solids as longitudinal waves and also as a transverse wave in solids. |
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| 530. |
The motion of a body that repeats itself after a regular interval of time is – |
| A. | a periodic motion |
| B. | a simple harmonic motion |
| C. | an aperiodic motion |
| D. | an oscillatory motion |
| Answer» A. a periodic motion | |
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Explanation: The motion of a body that repeats itself after a regular interval of time is called 'Periodic Motion'. Simple Harmonic Motion is a type of periodic motion where the restoring force is directly proportional to the displacement. |
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| 531. |
When a strong beam of light is passed through a colloidal solution, the light will – |
| A. | be scattered |
| B. | pass unchanged |
| C. | be absorbed |
| D. | be reflected |
| Answer» A. be scattered | |
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Explanation: When a strong beam of light is passed through a colloidal solution, the light will be scattered. |
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| 532. |
Which one of the following is not allied to Geophysical Sciences? |
| A. | Hydrology |
| B. | Meteorology |
| C. | Palaeontology |
| D. | Seismology |
| Answer» C. Palaeontology | |
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Explanation: Palaeontology is the study of fossils and the evolution of life on Earth. |
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| 533. |
The pitch of sound depends on its – |
| A. | Frequency |
| B. | Intensity |
| C. | Velocity |
| D. | Amplitude |
| Answer» A. Frequency | |
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Explanation: Pitch is a perceptual property that allows the ordering of sounds on a frequency- related scale. Pitch may be quantified as a frequency, but pitch is not a purely objective physical property; it is a subjective psycho- acoustical attribute of sound. |
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| 534. |
The ozone layer protects us from - |
| A. | Ultra violet rays |
| B. | Radio waves |
| C. | Visual radiation |
| D. | Infrared radiation |
| Answer» A. Ultra violet rays | |
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Explanation: The ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (UVR) from the sun, protecting life on Earth from its potentially harmful effects. |
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| 535. |
Entropy of the universe is - |
| A. | continuously increasing |
| B. | continuously decreasing |
| C. | zero |
| D. | constant |
| Answer» A. continuously increasing | |
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Explanation: In an irreversible process, entropy always increases, so the change in entropy is positive. The total entropy of the universe is continually increasing. |
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| 536. |
For which among the following house appliances, magnet is an essential part? |
| A. | Calling bell |
| B. | Fan |
| C. | Washing machine |
| D. | All of the above |
| Answer» D. All of the above | |
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Explanation: 0 |
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| 537. |
Cylindrical lens is used by a person suffering from - |
| A. | astigmatism |
| B. | myopia |
| C. | hypermetropia |
| D. | None of these |
| Answer» A. astigmatism | |
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Explanation: A cylindrical lens is typically used to focus, condense or expand incoming light. A cylindrical lens has one cylindrical surface, causing light to be focused in a single dimension or axis. |
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| 538. |
Metals are good conductors of electricity because - |
| A. | they contain free electrons |
| B. | the atoms are lightly packed |
| C. | they have high melting point |
| D. | All of the above |
| Answer» A. they contain free electrons | |
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Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points. |
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| 539. |
Speed of sound in solids is - |
| A. | 10 times that in gas/ 10 |
| B. | 20 times that in gas/ 20 |
| C. | 5 times that in gas/ 5 |
| D. | 15 times that in gas/ 15 |
| Answer» D. 15 times that in gas/ 15 | |
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Explanation: Sound travels at 343 m/s in air; it travels at 1,480 m/s in water (4.3 times as fast as in air); and at 5,120 m/s in iron (about 15 times as fast as in air). |
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| 540. |
To open a door easily, the handle should be fixed – |
| A. | near the hinges |
| B. | away from mid-point opposite to hinges |
| C. | in the middle |
| D. | None of these |
| Answer» D. None of these | |
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Explanation: Since Torque = force x distance, to open a door easily, the handle should be fixed at the greatest distance from the hinges. If we pull with same force on a handle that is 2 feet away from the hinges, we will provide twice the torque, so it will be twice as easy to open.Q.50) Dioptere is the unit of – |
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| 541. |
Velocity of sound in air does not depend on – |
| A. | Density of air |
| B. | Temperature of air |
| C. | Pressure of air |
| D. | Humidity of air |
| Answer» C. Pressure of air | |
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Explanation: Assuming air to be an ideal gas, the speed of sound depends on temperature only. As air temperature increases, so does the speed of sound and vice versa. The speed of sound is completely independent of air pressure because the air pressure and air density are proportional to each other at the same temperature. |
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| 542. |
Conversion of sound energy into electrical energy is done by – |
| A. | Solar cell |
| B. | Gramophone |
| C. | Microphone |
| D. | Loudspeaker |
| Answer» C. Microphone | |
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Explanation: Conversion of sound energy into electrical energy is done by microphone. |
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| 543. |
The theory of inheritance of acquired characters was propounded by - |
| A. | Charles Darwin |
| B. | Gregor Mendel |
| C. | J. B. Lamarck |
| D. | Weismann |
| Answer» C. J. B. Lamarck | |
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Explanation: Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime to its offspring. |
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| 544. |
A jet engine works, on the principle of conservation of - |
| A. | linear momentum |
| B. | angular momentum |
| C. | energy |
| D. | mass |
| Answer» A. linear momentum | |
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Explanation: Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum” for short: Note that a body's momentum is always in the same direction as its velocity vector. |
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| 545. |
Which electromagnetic radiation is used for satellite communication? |
| A. | Ultraviolet |
| B. | Infrared |
| C. | Microwave |
| D. | Millimeter wave |
| Answer» C. Microwave | |
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Explanation: Microwave electromagnetic radiation is used for satellite communication. |
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| 546. |
Solar cells work on the principle of – |
| A. | photovoltaic effect |
| B. | photoelectric effect |
| C. | photoconductive effect |
| D. | photosynthesis |
| Answer» A. photovoltaic effect | |
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Explanation: Solar cells work on the principle of photovoltaic effect. |
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| 547. |
When a piece of stone is immersed in water, it displaces water of equal – |
| A. | Density |
| B. | Specific gravity |
| C. | Mass |
| D. | Volume |
| Answer» C. Mass | |
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Explanation: Archimedes' Principle states that upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces. |
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| 548. |
Efficiency of the catalyst depends on its |
| A. | physical state |
| B. | amount used |
| C. | molecular state |
| D. | number of free valencies |
| Answer» C. molecular state | |
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Explanation: 0 |
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| 549. |
The oil in the wick of lamp rises due to |
| A. | Pressure difference |
| B. | Pheonomenon of capillarity |
| C. | Low viscosity of oil |
| D. | Force of cohesion |
| Answer» B. Pheonomenon of capillarity | |
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Explanation: The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter. |
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| 550. |
Number of basic SI unit is . |
| A. | 4 |
| B. | 7 |
| C. | 6 |
| D. | 5 |
| Answer» B. 7 | |
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Explanation: International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units. |
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