McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 601. |
Which one of the following is not a Major Abiotic Factors? |
| A. | Temperature |
| B. | Water |
| C. | Light |
| D. | Air |
| Answer» D. Air | |
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Explanation: Major abiotic factors include water, sunlight, oxygen, soil and temperature. |
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| 602. |
Optical fibre works on the principle of |
| A. | refraction |
| B. | scattering |
| C. | interference |
| D. | total internal reflection |
| Answer» D. total internal reflection | |
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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. |
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| 603. |
The colours of stars depend on their – |
| A. | temperature |
| B. | distance |
| C. | radius |
| D. | atmospheric pressure |
| Answer» A. temperature | |
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Explanation: The colour of a star tells about its temperature, and the temperature depends on some combination of the star's mass and evolutionary phase. |
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| 604. |
Water has maximum density at – |
| A. | 100°C |
| B. | 0°C |
| C. | 4°C |
| D. | 273°C |
| Answer» C. 4°C | |
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Explanation: The maximum density of water occurs at 4 °C because at. this temperature, two opposing effects are in balance. Water is an exceptional compound that has a lower density in the solid phase than the liquid phase (i.e., ice floats on water). This is actually due to the ion nature of water in the liquid phase, which packs the molecules tightly together. |
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| 605. |
Which of the following colour of light deviates least through the prism? |
| A. | yellow |
| B. | green |
| C. | violet |
| D. | red |
| Answer» D. red | |
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Explanation: In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red colour is the largest in prism. As a result, the refractive index of glass is largest for violet colour and least for red colour. So the violet colour is deviated the most, while red colour is deviated least on passing through the prism. |
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| 606. |
Hydraulic brakes work on the principle of – |
| A. | Thomson's law |
| B. | Newton's law |
| C. | Bernoulli's theorem |
| D. | PascaQl's law |
| Answer» D. PascaQl's law | |
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Explanation: Hydraulic brake works on Pascal's law which states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations remain the same. |
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| 607. |
X- rays are waves. |
| A. | Longitudinal |
| B. | Transverse |
| C. | Electromagnetic |
| D. | Elastic |
| Answer» C. Electromagnetic | |
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Explanation: X-rays are a form of electromagnetic radiation as are radio waves. |
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| 608. |
Which planet is nearest to the sun? |
| A. | Earth |
| B. | Jupiter |
| C. | Mercury |
| D. | Mars |
| Answer» C. Mercury | |
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Explanation: At an average distance of only 57.9 million km, Mercury orbits closer to the Sun than any other planet. Mercury takes only 88 days to complete an orbit around the Sun. |
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| 609. |
The moon that we see in the sky is a |
| A. | Planet |
| B. | Star |
| C. | Sun |
| D. | Satellite |
| Answer» D. Satellite | |
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Explanation: The moon that we see in the sky is a satellite. It is a companion of our earth and moves round it. Like our earth, there are eight other planets that get heat and light from the sun. |
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| 610. |
The absolute zero is a temperature at which . |
| A. | molecular motion in a gas would cease |
| B. | water freezes |
| C. | all gases become liquid |
| D. | all gases become solid |
| Answer» A. molecular motion in a gas would cease | |
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Explanation: Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is the point at which all motion in matter stops. |
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| 611. |
The term "infrasonic" applied to sound refers to sound waves below - |
| A. | 200 Hz |
| B. | 20000 Hz |
| C. | 20 Hz |
| D. | 0 Hz |
| Answer» C. 20 Hz | |
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Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz. |
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| 612. |
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states that? |
| A. | Newton’s first law |
| B. | Newton’s Second Law |
| C. | Newton’s Third Law |
| D. | Principle of conservation of linear momentum |
| Answer» D. Principle of conservation of linear momentum | |
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Explanation: Conservation of linear momentum. The principle that the linear momentum of a system has constant magnitude and direction if the system is subjected to no external force. Also called law of conservation of linear momentum |
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| 613. |
A body moving in a circular path with a constant speed has a – |
| A. | constant velocity |
| B. | constant acceleration |
| C. | constant kinetic energy |
| D. | constant displacement |
| Answer» C. constant kinetic energy | |
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Explanation: In circular motion, the magnitude of the velocity of the body is constant but the direction is constantly changing. This means that, even though the speed is not changing, the |
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| 614. |
The large collection of stars, dust and gas held together by gravitational attraction between components is known as – |
| A. | Cluster |
| B. | Atmosphere |
| C. | Galaxy |
| D. | Sun Family |
| Answer» C. Galaxy | |
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Explanation: The term galaxy refers to a large collection of stars, dust, and has clouds which are held together by gravitational attraction. The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars. The Milky Way galaxy contains our solar system. |
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| 615. |
The working of a rocket is based on the principle of: |
| A. | Conservation of momentum |
| B. | Conservation of mass |
| C. | Conservation of energy |
| D. | Conservation of angular momentum |
| Answer» A. Conservation of momentum | |
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Explanation: The operation of a rocket illustrates the conservation of momentum. Just before launching, the momentum of the rocket is zero. When the rocket is fired, it forces a jet of hot gases with a high velocity through the nozzle. The jet of gases acquires a momentum downwards. Hence, the rocket acquires a momentum of equal magnitude in opposite direction. Thus the rocket moves upwards. |
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| 616. |
Light waves projected on oil surface show seven colours due to the phenomenon of |
| A. | polarisation |
| B. | refraction |
| C. | reflection |
| D. | interference |
| Answer» D. interference | |
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Explanation: In physics, interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude. |
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| 617. |
Which of the following has the maximum specific heat capacity? |
| A. | water |
| B. | piece of iron |
| C. | piece of gold |
| D. | chloroform |
| Answer» A. water | |
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Explanation: The quantity of heat required to raise the temperature of a substance by one degree Celsius is called its specific heat capacity. |
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| 618. |
Which variety of glass is heat resistant? |
| A. | Hard glass |
| B. | Flint glass |
| C. | Pyrex glass |
| D. | Bottle glas |
| Answer» C. Pyrex glass | |
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Explanation: Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass. |
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| 619. |
The waves used in sonography are – |
| A. | Micro waves |
| B. | Infra-red waves |
| C. | Sound waves |
| D. | Ultrasonic waves |
| Answer» D. Ultrasonic waves | |
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Explanation: Sonography is an ultrasound- based diagnostic imaging technique used for visualizing internal body structures including tendons, muscles, joints, vessels and internal organs for possible pathology or lesions. |
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| 620. |
Which of the following is a scalar quantity? |
| A. | Velocity |
| B. | Force |
| C. | Angular momentum |
| D. | Electrostatic potential |
| Answer» C. Angular momentum | |
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Explanation: The electrostatic potential at any point in an electric field is defined as the work done in bringing a unit positive charge from infinity to that point against the electric force of the field. |
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| 621. |
The sky appears blue due to – |
| A. | Rayleigh scattering |
| B. | Mie scattering |
| C. | Back scattering |
| D. | None of the above |
| Answer» A. Rayleigh scattering | |
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Explanation: The blue colour of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. |
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| 622. |
The device used to convert solar energy into electricity is – |
| A. | Photovoltaic cell |
| B. | Daniell cell |
| C. | Electrochemical cell |
| D. | Galvanic cell |
| Answer» A. Photovoltaic cell | |
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Explanation: Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power. |
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| 623. |
The absorption of ink by blotting paper involves - |
| A. | capillary action phenomenon |
| B. | viscosity of ink |
| C. | siphon action |
| D. | diffusion of ink through the blotting |
| Answer» A. capillary action phenomenon | |
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Explanation: The ability of a liquid to flow in narrow spaces without the assistance of, or even in opposition to, external forces like gravity. |
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| 624. |
A fuse wire is made of: |
| A. | an alloy of tin and copper |
| B. | an alloy of tin and lead |
| C. | an alloy of tin and aluminium |
| D. | an alloy of nickel and chromium |
| Answer» B. an alloy of tin and lead | |
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Explanation: Electric fuse wire is an alloy made of tin (63 % lead 37 %. The cross sectional area determines the melting point at a certain current. Alloys (e.g. tin/ lead) are used due to their 'eutectic' action -i.e. the resulting combination of good conductivity (due to the tin) with a low melting point due to the lead).Q.42) Ultra violet light of Sun's radiation is prevented from reaching the earth's atmosphere by the layer of – |
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| 625. |
Which instrument is used to measure depth of ocean? |
| A. | Galvanometer |
| B. | Fluxmeter |
| C. | Endoscope |
| D. | Fathometer |
| Answer» D. Fathometer | |
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Explanation: Galvanometer - measures electric current, Fluxmeter - measures magnetic flux, Endoscope - used to examine internal parts of the body. |
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| 626. |
When a running car stops suddenly, the passengers tends to lean forward because of: |
| A. | centrifugal force |
| B. | inertia of rest |
| C. | inertia of motion |
| D. | gravitational force |
| Answer» C. inertia of motion | |
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Explanation: When a running car stops suddenly, the passengers tend to lean forward due to inertia of motion. Inertia is that property of a body due to which it resists a change in its state of rest or of uniform motion. |
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| 627. |
Why the Earth is having its own atmosphere? |
| A. | Winds |
| B. | Clouds |
| C. | Gravity |
| D. | Rotation of the Earth |
| Answer» C. Gravity | |
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Explanation: Due to gravity, our Earth has an atmosphere, Gravity causes the gases to be held close to the earth instead of escaping into outer space. |
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| 628. |
A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear |
| A. | Black |
| B. | White |
| C. | Grey |
| D. | Opaque |
| Answer» B. White | |
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Explanation: Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is the colour of the object in that light. Objects appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths. |
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| 629. |
It is difficult to walk on ice because of. |
| A. | absence of friction |
| B. | less inertia |
| C. | more inertia |
| D. | more mass |
| Answer» A. absence of friction | |
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Explanation: It's difficult to walk on ice because there's very little friction between the bottoms of your shoes and the ice. Friction is a force that opposes motion. |
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| 630. |
One bar is equal to – (1) 10 ³ Pa |
| A. | 100 Pa |
| B. | 10 7 Pa |
| C. | 10 ⁴ Pa |
| D. | none |
| Answer» C. 10 ⁴ Pa | |
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Explanation: The bar is a non-Si unit of pressure. It is defined by the IUPAC as exactly equal to 100,000 Pa or 1O Pa. |
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| 631. |
A NOT gate can be implemented by: |
| A. | a single diode |
| B. | two diodes |
| C. | a single resistor |
| D. | a single transistor |
| Answer» D. a single transistor | |
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Explanation: In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. An inverter circuit outputs a voltage representing the opposite logic-level to its input. Inverters can be constructed using a single NMOS transistor or a single PMOS transistor coupled with a resistor. |
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| 632. |
Persistence of vision is the Principle behind: |
| A. | Binocular |
| B. | Cinema |
| C. | Periscope |
| D. | Camera |
| Answer» B. Cinema | |
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Explanation: Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of cinema, it was scientifically determined that a frame rate of less than 16 frames per second (frame/s) caused the mind to see flashing images. |
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| 633. |
Sudden fall in barometer is indication of |
| A. | Storm |
| B. | Rain |
| C. | Tide |
| D. | Clear weather |
| Answer» C. Tide | |
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Explanation: Sudden fall in barometer is indication of Storm. A barometer measures air pressure: A "rising" barometer indicates increasing air pressure; a "falling" barometer indicates decreasing air pressure. |
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| 634. |
If in a motion, the axis of the rotation does not pass through the object, then the motion is called - |
| A. | Spin motion |
| B. | Oscillatory motion |
| C. | Translatory motion |
| D. | Orbital motion |
| Answer» D. Orbital motion | |
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Explanation: The axis of the rotation does not pass through the object in orbital motion. It involves the quantum mechanical motion of rigid particles (such as electrons) about some other mass, or about them selves. |
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| 635. |
Who among the following evolved the concept of relationship between mass and energy? |
| A. | Einstein |
| B. | Planck |
| C. | Dalton |
| D. | Rutherford |
| Answer» A. Einstein | |
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Explanation: Einstein correctly described the equivalence of mass and energy as “the most important upshot of the special theory of relativity” (Einstein 1919), for this result lies at the core of modern physics. |
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| 636. |
Super cooling is cooling of liquid . |
| A. | below melting point |
| B. | below freezing point |
| C. | at melting point |
| D. | above melting point |
| Answer» B. below freezing point | |
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Explanation: Supercooling is the process of chilling a liquid below its freezing point, without it becoming solid. |
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| 637. |
The base of an electric iron is brightly polished mainly - |
| A. | to make it smooth and frictionless |
| B. | to make it rust-proof |
| C. | to reduce heat loss by radiation |
| D. | to make it more durable |
| Answer» C. to reduce heat loss by radiation | |
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Explanation: Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise. |
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| 638. |
Oparin's theary about origin of life' is related to - |
| A. | chemical evolution |
| B. | physical evolution |
| C. | biological evolution |
| D. | artificial evolution |
| Answer» A. chemical evolution | |
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Explanation: Alexander Oparin was a Russian biochemist, notable for his contributions to the theory of the origin of life on Earth, and particularly for the primordial soup theory of the evolution of life from carbon-based molecules. |
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| 639. |
Heat given to a body which raises its temperature by 1°C is known as - |
| A. | water equivalent |
| B. | thermal capacity |
| C. | specific heat |
| D. | temperature gradient |
| Answer» B. thermal capacity | |
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Explanation: Heat capacity or thermal capacity is a measurable physical quantity equal to the ratio of the heat added to (or removed from) an object to the resulting temperature change. |
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| 640. |
Flemings "Left hand Rule" is associated with the effect of – |
| A. | Electric field on current |
| B. | Magnetic field on magnet |
| C. | Electric field on magnet |
| D. | Magnetic Field on current |
| Answer» D. Magnetic Field on current | |
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Explanation: Whenever, a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, if a conductor is forcefully brought under a magnetic field, there will be an induced current in that conductor. In both of the phenomenon, there is a relation between magnetic field, current and force. |
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| 641. |
The force which makes a vehicle to stop when break is applied is called – |
| A. | gravitational force |
| B. | vanderwalls force |
| C. | frictional force |
| D. | covalent force |
| Answer» C. frictional force | |
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Explanation: A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction. When the brakes are applied, work is done by the friction force between the brakes and the wheels. |
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| 642. |
In radio-communication, the signals emitted by transmitting antenna are reflected on – |
| A. | stratosphere |
| B. | ozonosphere |
| C. | ionosphere |
| D. | troposphere |
| Answer» C. ionosphere | |
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Explanation: The lower atmosphere is more or less transparent to radio waves. However, the ionosphere reflects back the radio waves. Thus, a signal emitted by an antenna from a certain place can be received at another place on the surface of Earth in the following two ways: ground wave propagation and sky wave propagation. |
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| 643. |
While cooking, if the bottom of the vessel is getting blackened on the outside, it means that |
| A. | The food is not cooked completely |
| B. | The fuel is not burning completely |
| C. | The fuel is wet |
| D. | The fuel is burning completely |
| Answer» B. The fuel is not burning completely | |
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Explanation: If we observe the bottoms of cooking vessels getting blackened, it means that the air holes are blocked and fuel is getting wasted. |
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| 644. |
If electrical conductivity increases with the increase of temperature of a substance, then it is a |
| A. | Conductor |
| B. | Semiconductor |
| C. | Insulator |
| D. | Carborator |
| Answer» B. Semiconductor | |
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Explanation: A solid substance that has conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects. |
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| 645. |
Automatic wrist watches get energy from - |
| A. | twist in spring |
| B. | liquid crystal |
| C. | kinetic energy |
| D. | movement of our hands |
| Answer» A. twist in spring | |
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Explanation: An automatic watch is a watch that continues to operate due to the regular motion of the wearer's wrist. |
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| 646. |
Radian is used to measure - |
| A. | Temperature |
| B. | Intensity of Flame |
| C. | Angle |
| D. | Solid Angle |
| Answer» C. Angle | |
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Explanation: Kelvin is used to measure Temperature, Candela is used to measure Intensity of flame, Steredian is used to measure Solid Angle. |
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| 647. |
Which one of the following types of glass can cut off ultraviolet rays? |
| A. | Soda glass |
| B. | Pyrex glass |
| C. | Jena glass |
| D. | Crookes glass |
| Answer» D. Crookes glass | |
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Explanation: In this glass mainly cerium oxide (CiO2) is present which sharply absorbs the ultraviolet rays from the sunlight so utilized in making lenses of eye glasses. |
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| 648. |
Light year is a unit of – |
| A. | Light |
| B. | Current |
| C. | Distance |
| D. | Time |
| Answer» C. Distance | |
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Explanation: A light-year is a unit of length used informally to express astronomical distances. It is equal to just under 10 trillion kilometres. |
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| 649. |
The word 'insulation' means – |
| A. | matters which insulate |
| B. | incoming solar radiation |
| C. | insoluble matters |
| D. | None of the above |
| Answer» B. incoming solar radiation | |
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Explanation: Insolation is the solar radiation that reaches the earth's surface. It is measured by the amount of solar energy received per square centimeter per minute. Insolation affects temperature. The more the insolation, the higher is the temperature. |
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| 650. |
Which of the following is not a vector quantity? |
| A. | Speed |
| B. | Velocity |
| C. | Torque |
| D. | Displacement |
| Answer» A. Speed | |
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Explanation: Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. It does not keep track of direction. In contrast, velocity is a vector quantity as it is direction aware. |
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