McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 451. |
Which colour of light shows maximum deviation when passed through a prism? |
| A. | Red |
| B. | Green |
| C. | Violet |
| D. | Yellow |
| Answer» C. Violet | |
|
Explanation: When passed through a prism violet colour of light shows maximum deviation. As white light passes through a prism, the voilet component, having the minimum wave length observes the maximum refractive index for the prism and, thus, gets deviated to the maximum extent. |
|
| 452. |
Which one of the following is called a red planet? |
| A. | Venus |
| B. | Mercury |
| C. | Mars |
| D. | Jupiter |
| Answer» C. Mars | |
|
Explanation: Mars is often called the 'Red planer' because it appears in the sky as an orange-red star. |
|
| 453. |
Which of the following is the unit of distance in navigation? |
| A. | Knot |
| B. | Nautical mile |
| C. | Bar |
| D. | Angstrom |
| Answer» B. Nautical mile | |
|
Explanation: A nautical mile is based on the circumference of the earth, and is equal to one minute of latitude. It is slightly more than a statute (land measured) mile (1nautical mile = 1.1508 statute miles). |
|
| 454. |
The sharpness of a television image is termed as its – |
| A. | Clarity |
| B. | Colour |
| C. | Resolution |
| D. | Graphics |
| Answer» C. Resolution | |
|
Explanation: Resolution is an umbrella term that describes the detail an image holds. The term applies to raster digital images, film images, and other types of images. The display resolution of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed. |
|
| 455. |
0°K is equivalent to |
| A. | 273°C |
| B. | -273°C |
| C. | 0°C |
| D. | 100°C |
| Answer» B. -273°C | |
|
Explanation: 0 degrees Kelvin is equal to -273.15 degrees Celsius. It is the lowest possible temperature, at which all molecules are have the least possible amount of kinetic energy. |
|
| 456. |
What is the telescope designed to search for earth-size planets in the nearby region of our galaxy, termed as? |
| A. | Hubble telescope |
| B. | Kepler telescope |
| C. | Copernicus telescope |
| D. | Newton telescope |
| Answer» A. Hubble telescope | |
|
Explanation: The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. |
|
| 457. |
Which law is also called the law of inertia? |
| A. | Newton's first law |
| B. | Newton's Second Law |
| C. | Newton's Third Law |
| D. | All of these |
| Answer» A. Newton's first law | |
|
Explanation: "An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force." In fact, it is the natural tendency of objects to resist changes in their state of motion. |
|
| 458. |
Ohm’s law obeyed in - |
| A. | a metallic conductor |
| B. | a semi conductor |
| C. | an electron tube |
| D. | in all of the above |
| Answer» A. a metallic conductor | |
|
Explanation: There are, however, components of electrical circuits which do not obey Ohm's law; that is, their relationship between current and voltage (their I–V curve) is nonlinear (or non-ohmic). |
|
| 459. |
Solar energy is due to – |
| A. | fusion reactions |
| B. | fission reactions |
| C. | combustion reactions |
| D. | chemical reactions |
| Answer» A. fusion reactions | |
|
Explanation: Nuclear Fusion Reaction is the process which is responsible for the sun to radiate energy in the form of light and heat commonly known as solar energy. Fusion occurs when hydrogen atoms fuse together under extreme heat and pressure to create a denser helium atom releasing, in the process, colossal amounts of energy. |
|
| 460. |
The plastic material commonly used for making gear wheels is – |
| A. | Polyesters |
| B. | Nylons |
| C. | Bakelit |
| D. | Polystyrene |
| Answer» B. Nylons | |
|
Explanation: Popular materials for plastic gears are acetal resins such as DELRIN, Duracon M90; nylon resins such as ZYTEL, NYLATRON, MC901 and acetal copolymers such as CELCON. The physical and mechanical properties of these materials vary with regard to strength, rigidity, dimensional stability, lubrication requirements, moisture absorption, etc. |
|
| 461. |
The nuclear force is - |
| A. | Short range repulsive force |
| B. | Short range attractive force |
| C. | Long range repulsive force |
| D. | Long range attractive force |
| Answer» B. Short range attractive force | |
|
Explanation: Nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. They bind protons and neutrons (“nucleons”) into atomic nuclei. |
|
| 462. |
The angle in which a cricket ball should be hit to travel maximum horizontal distance is : |
| A. | 60° with horizontal |
| B. | 45° with horizontal |
| C. | 30° with horizontal |
| D. | 15° with horizontal |
| Answer» B. 45° with horizontal | |
|
Explanation: This has to do with the equation of a parabola or trajectory which is z = (tane)x 2 cos 9) 2. We can see that if the ball is fired at a 45 degree angle from the ground, the horizontal distance will be a maximum. |
|
| 463. |
The minimum number of geostationary satellites needed for un-interrupted global coverage is |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 1 |
| Answer» B. 2 | |
|
Explanation: In theory, 2 satellites in diametrically opposite geosynchronous orbits could cover the planet. In order for the satellites to communicate, a minimum of 3 would be needed, each at a 60 degree angle to the others. At this point, the strength and quality of coverage increases proportionally to the number of satellites. |
|
| 464. |
Which type of mirror is used in the head lights of vehicles? |
| A. | Plane mirror |
| B. | Concave mirror |
| C. | Convex mirror |
| D. | Parabolic mirror |
| Answer» B. Concave mirror | |
|
Explanation: Car head lights have concave mirrors because it collects and focuses as much as possible of the light from the bulb and send it out as a fairly tight beam in one direction only. The bulb of the head light is placed at the focal point. The reflected light is parallel and gives more visibility to the driver at night. |
|
| 465. |
The height of a geo-stationary satellite from the Earth's surface is approximately : |
| A. | 36,000 km |
| B. | 42,000 km |
| C. | 30,000 km |
| D. | None of these |
| Answer» A. 36,000 km | |
|
Explanation: A geostationary orbit is a circular orbit 35,786 kilometres above the Earth's equator and following the direction of the Earth's rotation. Communications satellites and weather satellites are often given geostationary orbits, so that the satellite antennas that communicate with them do not have to move to track them, but can be pointed permanently at the position in the sky where they stay. |
|
| 466. |
Shaving mirror is – |
| A. | Convex |
| B. | Concave |
| C. | Plane |
| D. | Parabolic |
| Answer» B. Concave | |
|
Explanation: Concave mirrors are used in makeup or shaving mirrors. When shaving or applying makeup, a person holds the mirror close to her face. This allows him to see anenlarged image of him face, which is helpful for applying makeup or shaving correctly. |
|
| 467. |
Magnifying Glass is basically a – |
| A. | Plano-concave lens |
| B. | Concave lens |
| C. | Convex lens |
| D. | Cylindrical lens |
| Answer» C. Convex lens | |
|
Explanation: A magnifying glass is a convex lens that is used to produce a magnified image of an object. The magnification of a magnifying glass depends upon where it is placed between the user's eye and the object being viewed, and the total distance between them. |
|
| 468. |
The velocity of heat radiation in vacuum is – |
| A. | Equal to that of light |
| B. | Less than that of light |
| C. | Greater than that of light |
| D. | Equal to that of sound |
| Answer» A. Equal to that of light | |
|
Explanation: Electrons are generally responsible for heat conduction. The phonons (vibrations of the nuclei) also play a part, depending on the temperature of the medium. It depends on the specific conductor you're using. At some point, in a vacuum, the electrons have to be excited enough to spit out photons, which are Electromagnetic radiation, which in a vacuum should go on forever at the speed of light theoretically. |
|
| 469. |
Which of the following is the best conductor of electricity? |
| A. | Ordinary water |
| B. | Sea water |
| C. | Boiled water |
| D. | Distilled water |
| Answer» B. Sea water | |
|
Explanation: Sea water is a "good" conductor. It has a resistance and resistance increases by distance. So if you dip a very high voltageelectric wire in the ocean, the area around it (even 100 meters or more based on how high it is) gets electric. |
|
| 470. |
Which of the following colours has got the maximum refractive index for glass? |
| A. | Blue |
| B. | Green |
| C. | Red |
| D. | Indigo |
| Answer» C. Red | |
|
Explanation: 0 |
|
| 471. |
The working principle of a washing machine is : |
| A. | centrifugation |
| B. | dialysis |
| C. | reverse osmosis |
| D. | diffusion |
| Answer» A. centrifugation | |
|
Explanation: The working of the washing machine is quite high tech, and includes a set sequence of washing, rinsing, and spinning (plus a pre-wash if desired). |
|
| 472. |
The hydraulic brake used in automobiles is a direct application of - |
| A. | Archimedes principle |
| B. | Torricellean law |
| C. | Bernoulli's Theorem |
| D. | Pascal's law |
| Answer» D. Pascal's law | |
|
Explanation: Pascal's law basically states that any pressure applied to a fluid inside a closed system will transmit that pressure equally in all directions throughout the fluid. |
|
| 473. |
Longitudinal waves and Transverse waves are types of - |
| A. | Mechanical waves |
| B. | Non-Mechanical waves |
| C. | Both of above |
| D. | None of Above |
| Answer» A. Mechanical waves | |
|
Explanation: Mechanical Waves are waves which propagate through a material medium (solid, liquid, or gas) at a wave speed which depends on the elastic and inertial properties of that medium. |
|
| 474. |
Due to rusting the weight of iron - |
| A. | Decreases |
| B. | Increases |
| C. | Remains the same |
| D. | Uncertain |
| Answer» B. Increases | |
|
Explanation: Corrosion of a block of metal - Iron to Iron Oxide (rust), Aluminum to Bauxite, Cooper to Cupric-oxide, or otherwise - does not change the weight of the metal in the system. |
|
| 475. |
Water will not be vaporized if – |
| A. | the temperature is 0°C |
| B. | the humidity is 0% |
| C. | the humidity is 100% |
| D. | the temperature is 100°C |
| Answer» C. the humidity is 100% | |
|
Explanation: If the relative humidity is 100 percent, water will not evaporate as the air is already saturated with moisture. When relative humidity approaches 100 percent, condensation can occur. The lower the relative humidity, the easier it is for moisture to evaporate. |
|
| 476. |
Which of the following is not a part of a CRT? |
| A. | Phosphor screen |
| B. | Shadow mask |
| C. | Electron gun |
| D. | Gas plasma |
| Answer» D. Gas plasma | |
|
Explanation: The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of electrons or electron emitter) and a fluorescent screen used to view images. Colour tubes use three different phosphors which emitred, green, and blue light respectively. They are packed together in stripes (as in aperture grille designs) or clusters called "triads" (as in shadow mask CRTs). |
|
| 477. |
Decibel is a term connected with : |
| A. | air |
| B. | water |
| C. | sound |
| D. | soil |
| Answer» C. sound | |
|
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. |
|
| 478. |
As we go from Equator to North pole the value of `S, the acceleration due to gravity |
| A. | remains the same |
| B. | decreases |
| C. | increases |
| D. | None of the above |
| Answer» C. increases | |
|
Explanation: The acceleration due to gravity of earth is the rate of increase of velocity of a body falling freely towards the earth. At a given place, the value of acceleration due to gravity is constant but it varies from one place to another place on the earth surface. It is due to this fact that earth is not a perfect sphere. It is flattened at the poles and bulges out at the equator. The value of 'g' is minimum at the equator and maximum at the poles. |
|
| 479. |
The best conductor of electricity among the following is : |
| A. | Copper |
| B. | Iron |
| C. | Aluminium |
| D. | Silver |
| Answer» D. Silver | |
|
Explanation: Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver. |
|
| 480. |
Flight Recorder is technically called : |
| A. | Dark box |
| B. | Blind box |
| C. | Black box |
| D. | Altitude meter |
| Answer» C. Black box | |
|
Explanation: A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio Communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds. |
|
| 481. |
The part of the eye having the largest refractive index is - |
| A. | cornea |
| B. | aqueous humor |
| C. | lens |
| D. | vitreous humor |
| Answer» C. lens | |
|
Explanation: Like a camera, the human eye uses a convex lens system to form a small, inverted, real image of an object in front of it. Lens is the part of the eye having the largest refractive index. |
|
| 482. |
The centre of gravity of a sprinter during the race lies – |
| A. | Ahead of his feet |
| B. | Behind his feet |
| C. | At the centre of the body |
| D. | To the left side of the body |
| Answer» A. Ahead of his feet | |
|
Explanation: Running is a means of terrestrial locomotion allowing humans and other animalsto move rapidly on foot. It is simply defined in athletics terms as a gait in which at regular points during the running cycle both feel are off the ground. This is in cont rast to walking, where one foot is always in contact with the ground, the legs are kept mostly straight and the center of gravity vaults over the legs in an inverted pendulum fashion. |
|
| 483. |
Which of the following liquids has the least density? |
| A. | Fresh water |
| B. | Salt water |
| C. | Petrol |
| D. | Mercury |
| Answer» C. Petrol | |
|
Explanation: Gasoline or petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal Combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. |
|
| 484. |
The hair of shaving brush clings together when removed from water due to – |
| A. | Surface tension |
| B. | Viscosity |
| C. | Elasticity |
| D. | Friction |
| Answer» A. Surface tension | |
|
Explanation: Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. It is revealed, for example, in the floating of some objects on the surface of water, even though they are denser than water, and in the ability of some insects (e.g. water striders) to run on the water surface. This property is caused by cohesion of similar molecules, and is responsible for many of the behaviors of liquids. |
|
| 485. |
If a current of 1.5 A is maintained in a resistor of 10 2, then the energy dissipated in the resistor in 1 minute will be : |
| A. | 15 W |
| B. | 22.5 W |
| C. | 135 W |
| D. | 1350 W |
| Answer» D. 1350 W | |
|
Explanation: The potential difference or voltage, V, across two points is defined as the energy, E dissipated or transferred by a coulomb of charge 9, that moves through two points. |
|
| 486. |
Submerged objects can be located using |
| A. | Radar |
| B. | Sonar |
| C. | Quasar |
| D. | Pulsar |
| Answer» B. Sonar | |
|
Explanation: Sonar (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. |
|
| 487. |
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will - |
| A. | Increase |
| B. | decrease |
| C. | remain unaffected |
| D. | have its shape changed |
| Answer» A. Increase | |
|
Explanation: The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase. |
|
| 488. |
Where are mesons found? |
| A. | Cosmic rays |
| B. | X-rays |
| C. | Gamma rays |
| D. | Laser beam |
| Answer» A. Cosmic rays | |
|
Explanation: Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, suchparticles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction. |
|
| 489. |
A larger force on a rotating body results in larger . |
| A. | Mass |
| B. | Torque |
| C. | Axis of rotation |
| D. | Centre of mass |
| Answer» C. Axis of rotation | |
|
Explanation: 0 |
|
| 490. |
Which of the following is used in oven? |
| A. | X-rays |
| B. | UV rays |
| C. | Microwaves |
| D. | Radiowaves |
| Answer» C. Microwaves | |
|
Explanation: An oven that uses micro radiation waves as a source of heat in order to cook food as opposed to a fire source. Conceptualized in 1946, Dr. Perry Spencer allegedly discovered the heating properties of microwaves while studying the magnetron. A microwave oven, often colloquially shortened to microwave, is a kitchen appliance that heats food by dielectric heating accomplished with radiation used to heat polarized molecules in food. |
|
| 491. |
The instrument used to see the distant objects on the Earth is – |
| A. | Terrestrial telescope |
| B. | Astronomical telescope |
| C. | Compound microscope |
| D. | Simple microscope |
| Answer» A. Terrestrial telescope | |
|
Explanation: A telescope assists the eye chiefly in two way by enlarging the visual angle underwhich a distant object is seen, and thus magnifying that object; and. secondly, by collecting, and conveying to the eye, a larger beam of light than would enter the naked organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible. |
|
| 492. |
Which of the following principle is used to produce low-temperatures'? |
| A. | Super conductivity |
| B. | Joule-Kelvin effect |
| C. | Thermo-electric effect |
| D. | Adiabatic demagnetization |
| Answer» D. Adiabatic demagnetization | |
|
Explanation: Magnetic refrigeration is a cooling technology based on the magneto- caloiic effect. This technique can be used to attain extremely low temperatures, as well as the ranges used in common refrigerators, depending on the design of the system. The magneto- caloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a change in temperature of a suitable material is caused by exposing the material to a changing magnetic field. |
|
| 493. |
A current carrying conductor is associated with – |
| A. | a magnetic field |
| B. | an electric field |
| C. | an electro-magnetic field |
| D. | an electrostatic field |
| Answer» C. an electro-magnetic field | |
|
Explanation: A current carrying conductor, such as a metal wire, will produce a magnetic field around it because of the motion of charge within the wire itself. This motion produces or sets up a magnetic field around the wire in the form of concentric circles. |
|
| 494. |
The weakest of all fundamental forces is – |
| A. | Gravitational force |
| B. | Electrostatic force |
| C. | Magnetic force |
| D. | Nuclear force |
| Answer» A. Gravitational force | |
|
Explanation: In particle physics, fundamental interactions (sometimes called interactive forces or fundamental forces) are the ways that elementary particles interact with one another. An interaction is fundamental when it cannot be described in terms of other interactions. The four known fundamental interactions are electromagnetism, strong interaction ("strong nuclear force"), weak interaction ("weak nuclear force"), and gravitation. All are non-contact forces. |
|
| 495. |
Which of the following instruments is used to measure humidity? |
| A. | Kata Thermometer |
| B. | Anemometer |
| C. | Sling Psychrometer |
| D. | Clinical Thermometer |
| Answer» C. Sling Psychrometer | |
|
Explanation: A psychrometer consists of two thermometers, one which is dry and one which is kept moist with distilled water on a sock or wick. The two thermometers are thus called the dry-bulb and the wet-bulb. Relative humidity is computed from the ambient temperature as shown by the dry-bulb thermometer and the difference in temperatures as shown by the wet-bulb and dry-bulb thermometers. The sling psychrometer, where the thermometers are attached to a handle or length of rope and spun around in the air for a few minutes, is sometimes used for field measurements, but is being replaced by more convenient electronic sensors. |
|
| 496. |
A micron is equal to – |
| A. | 0.1 ram |
| B. | 0.01 mm |
| C. | 0.001 mm |
| D. | 0.0001 mm |
| Answer» C. 0.001 mm | |
|
Explanation: 1 micron = 0.001 millimeters. A micrometre (micron) is one-millionth of a metre (or one-thousandth of a millimetre, 0.001 mm). Its unit symbol in the International System of Units (8I) is pm. It is a common unit of measurement for wavelengths of infrared radiation as well as sizes of cells and bacteria. |
|
| 497. |
Persons suffering from myopia are advised to use – |
| A. | convex lens |
| B. | concave lens |
| C. | piano-convex lens |
| D. | plano-concave lens |
| Answer» B. concave lens | |
|
Explanation: A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This occurs when the eye is relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong. |
|
| 498. |
If cream is removed from milk, its density – |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | May increase or decrease |
| Answer» A. Increases | |
|
Explanation: The density of pure fresh milk being on the average 1.032, while the density of fat globules is about 0.86. It follows that the removal of cream will increase the density, while the addition of water will decrease it. |
|
| 499. |
A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will - |
| A. | first rise and then fall |
| B. | fall |
| C. | remain the same |
| D. | rise |
| Answer» C. remain the same | |
|
Explanation: The submerged portion of the ice on melting shrinks a little in volume. So the level of water goes down a little. But this is just made up by the water added by the melting of upper portion. |
|
| 500. |
A steam engine converts the heat energy of steam into . |
| A. | Electrical energy |
| B. | Chemical energy |
| C. | Mechanical energy |
| D. | Thermal energy |
| Answer» C. Mechanical energy | |
|
Explanation: Steam engine, machine for converting heat energy into mechanical energy using steam as a medium, or working fluid. |
|
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.