McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 51. |
A kilowatt-hour is unit of – |
| A. | Energy |
| B. | Power |
| C. | Electric charge |
| D. | Electric current |
| Answer» A. Energy | |
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Explanation: Work is defined as a force acting through a distance (a length of space), energy is always equivalent to the ability to exert pulls or pushes against the basic forces of nature, along a path of a certain length. In the International System of Units (SI), energy is measured in joules, but in many fields other units, such as kilowatt-hours and kilocalories, are customary. |
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| 52. |
Which of the following is used to split white light into different colors? |
| A. | Glass slab |
| B. | Convex lens |
| C. | Concave lens |
| D. | Prism |
| Answer» D. Prism | |
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Explanation: In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. At least two of the flat surfaces must have an angle between them. The exact angles between the surfaces depend on the application. The traditional geometrical shape is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type. |
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| 53. |
Nuclear reactors used to produce electricity are based on – |
| A. | Nuclear fission |
| B. | Nuclear fusion |
| C. | Cold fusion |
| D. | Superconductivity |
| Answer» A. Nuclear fission | |
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Explanation: A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships. Usually heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines that power either ship's propellers or generators. |
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| 54. |
Energy that is produced commercially from coal is called – |
| A. | Light energy |
| B. | Kinetic energy |
| C. | Thermal energy |
| D. | Potential energy |
| Answer» C. Thermal energy | |
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Explanation: Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes. |
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| 55. |
Which among the following is not a characteristic of transition metals? |
| A. | Tendency to gain electrons |
| B. | Low electro negativity |
| C. | Low ionization energy |
| D. | Malleability |
| Answer» A. Tendency to gain electrons | |
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Explanation: The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state. |
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| 56. |
Which one of the following is not a function of the liver? |
| A. | Regulation of blood sugar |
| B. | Enzyme activation |
| C. | Detoxiation |
| D. | Reproduction |
| Answer» D. Reproduction | |
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Explanation: Liver is the body’s largest internal organ. It has many functions in the body like it helps in protein synthesis and blood clotting, manufacturing triglycerides and cholesterol, glycogen synthesis, and bile production. |
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| 57. |
The source of the Sun's energy is the process of – |
| A. | Photoelectric emission |
| B. | Nuclear fission |
| C. | Nuclear fusion |
| D. | Thermionic emission |
| Answer» C. Nuclear fusion | |
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Explanation: Nuclear fusion is a nuclear reaction in which two or more atomic nuclei join together, or "fuse", to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy which is released. Fusion is the process that powers active stars. |
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| 58. |
A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be - |
| A. | a parabola |
| B. | a horizontal straight line |
| C. | a vertical straight line |
| D. | a circle |
| Answer» A. a parabola | |
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Explanation: Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So, by Newton's first law, it continues its motion horizontally with that velocity. |
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| 59. |
Which of the following is a nonrenewable source of energy? |
| A. | Biogas |
| B. | Solar |
| C. | Wind |
| D. | Coal |
| Answer» D. Coal | |
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Explanation: A non-renewable resource is a natural resource which cannot be reproduced, grown, generated, or used on a scale which can sustain its consumption rate. So, coal is nonrenewable source of energy. Once it is depleted, there is no more available for future needs. Fossil fuels (such as coal, petroleum, and natural gas), nuclear power (uranium) and certain aquifers are examples of non-renewable resources. |
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| 60. |
Solar energy is converted into chemical energy during – |
| A. | Transpiration |
| B. | Photosynthesis |
| C. | Diffusion |
| D. | Osmosis |
| Answer» B. Photosynthesis | |
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Explanation: In photosynthesis, solar energy is converted to chemical energy. The chemical energy is stored in the form of glucose (sugar). Carbon dioxide, water, and sunlight are used to produce glucose, oxygen, and water. Photosynthesis is a process used by plants and other organisms to convert the light energy captured from the sun into chemical energy that can be used to fuel the organism's activities. |
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| 61. |
Decibel is the unit used for – |
| A. | Speed of light |
| B. | Intensity of heat |
| C. | Intensity of sound |
| D. | Radio wave frequency |
| Answer» C. Intensity of sound | |
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Explanation: The decibel (abbreviated dB) is the unit used to measure the intensity of a sound. The decibel scale is a little odd because the human ear is incredibly sensitive. Our ears can hear everything from your fingertip.brushing lightly over your skin to a loud jet engine. The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. |
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| 62. |
The term ‘Isoneph' indicates the lines of equal – |
| A. | cloudiness |
| B. | salinity |
| C. | rainfall |
| D. | pressure |
| Answer» A. cloudiness | |
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Explanation: An isoneph is a line indicating equal cloud cover or equal cloudiness. Variations in the degrees of slope, temperature, occurrence of rainfall, may be represented by drawing the lines of equal values on a map. All such maps are termed as Isopleth Map. The word Isopleth is derived from 'Iso' meaning equal and 'pleth' means lines. Thus, an imaginary line, which joins the places of equal values, is referred as Isopleth. |
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| 63. |
Fibre optics work on the principle of – |
| A. | Scattering of light |
| B. | Total internal absorption |
| C. | Total internal reflection |
| D. | Optical rotation |
| Answer» C. Total internal reflection | |
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Explanation: An optical fiber (or optical fibre) is a flexible, transparent fiber made of glass (silica) or plastic, slightly thicker than a human hair. It functions as a waveguide, or "light pipe", to transmit light between the two ends of the fiber. The field of applied science and engineering concerned with the design and application of optical fibers is known as fiber optics. |
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| 64. |
A decibel is – |
| A. | A musical instrument |
| B. | The wavelength of noise |
| C. | A musical note |
| D. | A measure of sound level |
| Answer» D. A measure of sound level | |
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Explanation: The decibel (dB) is a logarithmic unit that indicates the ratio of a physical quantity (usually power or intensity) relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities. |
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| 65. |
The type of mirrors used in the headlamp of cars is – |
| A. | Parabolic concave |
| B. | Plane |
| C. | Spherical convex |
| D. | Cylindrical concave |
| Answer» A. Parabolic concave | |
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Explanation: Curved mirror that reflects light from its inner surface, the curve being inward. It may be either circular or parabolic in section. A concave mirror converges parallel light rays inward to the point of principal focus. The image formed by a concave mirror is real (reduced and inverted) if the object is not too close to the mirror. A real image is formed at the point of convergence. |
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| 66. |
If lift is going up with acceleration, the apparent weight of a body is - |
| A. | may be more or less than true weight |
| B. | equal to the true weight |
| C. | less than the true weight |
| D. | more than the true weight |
| Answer» D. more than the true weight | |
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Explanation: If lift is going up with acceleration, the apparent weight of a body is more than the true weight. |
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| 67. |
The rate of transfer of charges through a circuit is called? |
| A. | Potential Difference |
| B. | Resistance |
| C. | Current |
| D. | Energy |
| Answer» C. Current | |
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Explanation: The rate of transfer of charges through a circuit is called Current. An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. |
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| 68. |
The filament of electric bulb is made up of : |
| A. | Copper |
| B. | Nichrome |
| C. | Lead |
| D. | Tungsten |
| Answer» D. Tungsten | |
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Explanation: An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light which produces light with a filament wire heated to a high temperature by an electric current passing through it, until it glows. Tungsten, also known as wolfram, is a chemical element. |
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| 69. |
When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to – |
| A. | reflection |
| B. | refraction |
| C. | forced vibrations |
| D. | damped vibrations |
| Answer» C. forced vibrations | |
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Explanation: The tendency of one object to force another adjoining or interconnected object into vibrational motion is referred to as a forced vibration. In the case of the guitar string mounted to the sound box, the fact that the surface area of the sound box is greater than the surface area of the string means that more surrounding air particles will be forced into vibration. This causes an increase in the amplitude and thus loudness of the sound. |
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| 70. |
Mud houses are cooler in summers and wanner in winters as compared to brick houses because |
| A. | mud is a good conductor |
| B. | mud is a bad conductor |
| C. | mud is a poor insulator |
| D. | evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters |
| Answer» B. mud is a bad conductor | |
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Explanation: The houses made of mud and thatched roofs are cool in summer and warm in winter as the thatched roof contains large amount of trapped air and also mud is a bad conductor of heat. In summer, the outside heat cannot enter the house and in winter, inside heat cannot flow outside. |
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| 71. |
Electricians use rubber gloves while working because - |
| A. | rubber is an insulator |
| B. | rubber is a good conductor |
| C. | wearing rubber gloves is mandatory |
| D. | rubber makes work easy |
| Answer» A. rubber is an insulator | |
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Explanation: 0 |
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| 72. |
When a person sitting on a swing stands up on the swing, the frequency of oscillation – |
| A. | decreases |
| B. | increases |
| C. | becomes infinite |
| D. | does not change |
| Answer» B. increases | |
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Explanation: In Simple Harmonic Motion, the frequency of the oscillation (1) is the number of oscillations per second which is expressed as f = 1/T where T is the time period (the time for the oscillator to complete one cycle). |
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| 73. |
Night photography and photopraphy in mist and fog are possible using – |
| A. | ultra-violet radiation |
| B. | infra-red radiation |
| C. | microwave radiation |
| D. | gamma radiation |
| Answer» B. infra-red radiation | |
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Explanation: Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the conversion of ambient light photons into electrons which are then amplified by a chemical and electrical process and then converted back into visible light. |
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| 74. |
An Athlets runs before long jump to get advantage on – |
| A. | Inertia of motion |
| B. | Frictional force |
| C. | Moment of a force |
| D. | Principle of moments |
| Answer» A. Inertia of motion | |
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Explanation: An athlete does so to build up forward momentum so that when he jumps he already has a forward motion that would be greater than that of a jump made from standing in one spot. He needs forward momentum to get a good long jump and the best way is to have a running start. In this way, he gets advantage in terms of inertia of motion which is the tendency of an object to resist a change in motion. |
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| 75. |
In sunlight, a rose appears red. In green light, the same rose appears – |
| A. | red |
| B. | black |
| C. | green |
| D. | yellow |
| Answer» B. black | |
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Explanation: Any object which allows light to pass through it is known as a transparent object. The colour of any transparent object is the colour of the light transmitted by it. A red rose appears red in white light because it absorbs all colours except red. However, when seen in green light, it looks black because the red colour of the rose is absorbed by the green light. |
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| 76. |
The sparkling of a diamond is due to – |
| A. | total internal reflection of light |
| B. | interference of light |
| C. | polarisation of light |
| D. | refraction of light |
| Answer» A. total internal reflection of light | |
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Explanation: Diamonds sparkle because of the total internal reflection of light. Diamonds have a very high refractive index, meaning they slow light down much more than glass; and if cut in the right manner, the angles of incidence can be made so that light seems to get 'trapped' within the diamond giving it it's sparkly appearance. |
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| 77. |
Ocean currents are an example of – |
| A. | convection |
| B. | conduction |
| C. | insulation |
| D. | radiation |
| Answer» A. convection | |
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Explanation: Heat is transferred by convection in numerous examples of naturally occurring fluid flow, such as: wind, oceanic currents, and movements within the Earth's atmosphere. Winds and ocean currents are examples of convection currents. Convection serves to transfer heat from the surplus to deficit heat zones and set the oceanic circulation in motion. |
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| 78. |
Which of the following is a good conductor of heat but a bad conductor of electricity? |
| A. | Celluloid |
| B. | Rubber |
| C. | Asbestos |
| D. | Mica |
| Answer» D. Mica | |
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Explanation: Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly used in insulation of electricity between high heat generating transistors and their heat sink and or chassis to prevent grounding out of component and to assist in the transfer of the generated heat to the heat sink or chassis for dissipation. |
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| 79. |
A piece of wood is held under water. The up thrust on it will be: |
| A. | equal to the weight of the Wood |
| B. | less than weight of the wood |
| C. | more than weight of the wood |
| D. | Zero |
| Answer» B. less than weight of the wood | |
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Explanation: According to the Archimedes' principle, a floating object will experience an upthrust force from water, equal to the weight of water displaced (pushed aside). It will sink into the water until it reaches the point where the weight of the water pushed aside equals its own weight. |
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| 80. |
In MRI machine, which one of the following is used? |
| A. | Sound wave |
| B. | X-ray |
| C. | Ultra-sound wave |
| D. | Magnetic wave |
| Answer» D. Magnetic wave | |
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Explanation: Magnetic resonance imaging (MRI), nuclear magnetic resonance imaging (NMRI), or magnetic resonance tomography (MRT) is a medical imaging technique used in radiology t o visualize internal structures of the body in detail. MRI makes use of the property of nuclear magnetic resonance (NMR) to image nuclei of atoms inside the body. |
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| 81. |
For a person having hypermetropia, the near point is – |
| A. | greater than 25 cm |
| B. | greater than 50 cm |
| C. | less than 25 cm |
| D. | infinity |
| Answer» A. greater than 25 cm | |
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Explanation: For a hyper-metropic eye ,the near points shift away from the eye Le. farther away from the normal near point (25cm). In a hypermetropic eye, the light is not bent sufficiently so that it focuses at a point behind the retina. Here a person sees well for distance but near vision is difficult and causes strain. |
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| 82. |
Amount of water vapour in the atmosphere is measured in terms of – |
| A. | Humidity |
| B. | Droplets |
| C. | Smog |
| D. | All of the above |
| Answer» A. Humidity | |
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Explanation: Humidity is the amount of water vapor in the air. Water vapor is the has phase of water and is invisible. Humidity indicates the likelihood of precipitation, dew, or fog. Higher humidity reduces the effectiveness of sweating in cooling the body by reducing the rate of evaporation of moisture from the skin. |
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| 83. |
Name the process of production of energy in the Sun – |
| A. | Nuclear fission |
| B. | Radioactivity |
| C. | Nuclear fusion |
| D. | Ionization |
| Answer» C. Nuclear fusion | |
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Explanation: The source of the sun's fuel is hydrogen and helium gases. Through a special chemical reaction, called nuclear fusion, the hydrogen gas is "burned" releasing an enormous amount of energy in the form of light and heat. |
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| 84. |
The ozone hole that has been detected lies in the atmosphere above – |
| A. | Arctic Ocean |
| B. | Antarctica |
| C. | India |
| D. | Alaska |
| Answer» B. Antarctica | |
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Explanation: Ozone layer, that is, the layer of life-protecting ozone found at the top of the stratosphere. Ozone is formed in the earth's stratosphere and is critical to life on earth as we know it. There is compelling scientific evidence that ozone is destroyed in the stratosphere and that some human-released chemicals are speeding up the breakdown of ozone in the atmosphere. |
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| 85. |
The device used to change the speed of an electric fan is – |
| A. | Amplifier |
| B. | Regulator |
| C. | Switch |
| D. | Rectifier |
| Answer» B. Regulator | |
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Explanation: A voltage regulator is designed to automatically maintain a constant voltage level. A voltage regulator maybe a simple "feedforward" design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages. Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elements. |
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| 86. |
Which one of the following wavelengths of light is most effective in photosynthesis? |
| A. | Blue |
| B. | Green |
| C. | Orange |
| D. | Yellow |
| Answer» A. Blue | |
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Explanation: Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. The wavelength most effective in conducting photosynthesis is 420nm. Actually, 420nrn is on the blue side of the spectrum, which makes up between 1 and 10% of the light needed for photosynthesis. |
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| 87. |
Why is it difficult to breathe at higher altitudes? |
| A. | Due to low air pressure |
| B. | Due to low temperature |
| C. | Due to ozone |
| D. | Due to high humidity |
| Answer» A. Due to low air pressure | |
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Explanation: Low air pressure is usually the most significant limiting factor in high mountain regions. The percentage of oxygen in the air at 3.2 km is essentially the same as at sea level (21%). However, the air pressure is 30% lower at the higher altitude due to the fact that the atmosphere is less dense—that is the air molecules are farther apart. At high altitudes, the lower air pressure makes it more difficult for oxygen to enter our vascular systems. |
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| 88. |
The reason for a swimming pool to appear less deep than the actual depth is – |
| A. | Refraction |
| B. | Light scattering |
| C. | Reflection |
| D. | Interference |
| Answer» A. Refraction | |
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Explanation: The apparent depth will look less that its real depth due to the refraction of light. Refraction is the bending of a wave when it enters a medium where it's speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell's Law. |
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| 89. |
Alternating current is converted into direct current by a – |
| A. | Transformer |
| B. | Dynamo |
| C. | Oscillator |
| D. | Rectifier |
| Answer» D. Rectifier | |
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Explanation: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification. |
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| 90. |
Remote-sensing device has an inbuilt source of – |
| A. | X-ray |
| B. | g-ray |
| C. | Ultraviolet ray |
| D. | Infrared ray |
| Answer» D. Infrared ray | |
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Explanation: Infrared imaging is used extensively for military and civilian purposes. Military applications include target acquisition, surveillance, night vision, homing and tracking. Non-military uses include thermal efficiency analysis, environmental monitoring, industrial facility inspections, remote temperature sensing, short-ranged wireless communication, spectroscopy, and weather forecasting. |
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| 91. |
The atmosphere is heated mainly by – |
| A. | Insulation |
| B. | Conduction |
| C. | Radiation |
| D. | Convection |
| Answer» C. Radiation | |
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Explanation: Changes in weather involve air movements, formation of clouds, and precipitation. Energy is needed to make all these things happen. That energy comes from the sun. Heat energy enters and moves through the atmosphere in three different ways. One way that heat energy is transferred is radiation. Hot bodies such as the sun radiate their energy mainly in the form of short waves. |
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| 92. |
The atmospheric layer reflecting radio waves is called – |
| A. | Ozonosphere |
| B. | Ionosphere |
| C. | Stratosphere |
| D. | Mesosphere |
| Answer» B. Ionosphere | |
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Explanation: The ionosphere is a part of the upper atmosphere, from about 85 km to 600 km altitude, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth. |
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| 93. |
'Cryogenics' is a science dealing with – |
| A. | high temperatures |
| B. | low temperatures |
| C. | friction and wear |
| D. | growth of crystals |
| Answer» B. low temperatures | |
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Explanation: Cryogenics is the study of how to get to low temperatures and of how materials behave when they get there. Besides the familiar temperature scales of Fahrenheit and Celsius (Centigrade), cryogenicists use other temperature scales, the Kelvin and Rankine temperature scales. One of the more modern processes being used to treat metals (as well as other materials) is cryogenic tempering. |
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| 94. |
Heat from the Sun reaches the Earth by |
| A. | Reflection |
| B. | Conduction |
| C. | Radiation |
| D. | Convection |
| Answer» C. Radiation | |
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Explanation: The radiation (light, heat, etc.) travels through the intervening 150,000,000 kilometers in 8 minutes. Radiation is a process in which energetic particles or energetic waves travel through vacuum, or through mattercontaining media that are not required for their propagation. Waves of a massive medium itself, such as water waves or sound waves, are usually not considered to be forms of "radiation" in this sense. |
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| 95. |
The commonly used thermometric substance is _____. |
| A. | mineral oil |
| B. | Alcohol |
| C. | Mercury |
| D. | Petrol |
| Answer» C. Mercury | |
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Explanation: Thermometric liquids are used in thermometers to measure temperature. Mercury and alcohol are common thermometric liquids. |
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| 96. |
Gamma rays can cause – |
| A. | gene mutation |
| B. | sneezing |
| C. | burning |
| D. | fever |
| Answer» A. gene mutation | |
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Explanation: In molecular biology and genetics, mutations are accidental changes in a genomic sequence of DNA: the DNA sequence of a cell's genome or the DNA or RNA sequence in some viruses. These random sequences can be defined as sudden and spontaneous changes in the cell. Mutations are caused by radiation, viruses, transposons and mutagenic chemicals, as well as errors that, occur during meiosis or DNA replication. |
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| 97. |
The dimension of which of the following is the same as that of impulse? |
| A. | Volume |
| B. | Momentum |
| C. | Torque |
| D. | Change in the rate of momentum |
| Answer» B. Momentum | |
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Explanation: The quantity of impulse is force x time interval. In classical mechanics, linear momentum or translational momentum is the product of the mass and velocity of an object. For example, a heavy truck moving fast has a large momentum—it takes a large and prolonged force to get the truck up to this speed, and it takes a large and prolonged force to bring it to a stop afterwards. If the truck were lighter or moving slower, then it would have less momentum. |
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| 98. |
Which among the following is the fundamental quantity? |
| A. | Volume |
| B. | Time |
| C. | Velocity |
| D. | Force |
| Answer» B. Time | |
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Explanation: The fundamental qualities of Physics are the seven basic quantities that can be used to express all other physical quantities. These are as follows: Length: Metre, Heat: Kelvin, Time: second, Luminous Intensity: Candela, Mass: Kilogram, Electric Current: Ampere, and Amount of substance: Moles. |
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| 99. |
Global warming is expected to result in |
| A. | Increase in level of sea |
| B. | Change in crop pattern |
| C. | Change in coast line |
| D. | All of the above |
| Answer» D. All of the above | |
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Explanation: Global warming is the rise in the average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's mean surface temperature has increased by about 0.8 °C (1.4 °F), with about two-thirds of the increase occurring since 1980. The effects of an increase in global temperature include a rise in sea levels and a change in the amount and pattern of precipitation, as well a probable expansion of subtropical deserts. |
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| 100. |
A transformer works on the principle of – |
| A. | Self induction |
| B. | Mutual induction |
| C. | Generator |
| D. | Inverter |
| Answer» B. Mutual induction | |
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