McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 551. |
Optical fibre works on the - |
| A. | principle of refraction |
| B. | total internal reflection |
| C. | scattering |
| D. | interference |
| Answer» B. total internal reflection | |
|
Explanation: Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection. |
|
| 552. |
Gas thermometers are more sensitive than the liquid thermometers because the gases – |
| A. | have large coefficient of expansion |
| B. | are lighter |
| C. | have low specific heat |
| D. | have high specific heat |
| Answer» A. have large coefficient of expansion | |
|
Explanation: Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the has thermometer is more sensitive than liquid (mercury) thereto-meter. |
|
| 553. |
A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground. |
| A. | 1 : 1 |
| B. | 1 : 2 |
| C. | 1 : 4 |
| D. | Cannot be found from the given information. |
| Answer» A. 1 : 1 | |
|
Explanation: The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit theground with same velocity. So the ratio between the speeds of two stones will be 1:1 |
|
| 554. |
The locomotion of insects to the source of light is called : |
| A. | Phototropic |
| B. | Hydrotropic |
| C. | Phototactic |
| D. | Thermotactic |
| Answer» A. Phototropic | |
|
Explanation: The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi. |
|
| 555. |
The splitting of white light into its components is due to: |
| A. | Reflection |
| B. | Refraction |
| C. | Transmission |
| D. | Dispersion |
| Answer» D. Dispersion | |
|
Explanation: Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow. |
|
| 556. |
The moment of inertia of a body does not depend upon its – |
| A. | axis of rotation |
| B. | angular velocity |
| C. | form of mass |
| D. | distribution of mass |
| Answer» B. angular velocity | |
|
Explanation: Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions. |
|
| 557. |
The speed of light will be minimum while passing through - |
| A. | water |
| B. | vaccum |
| C. | air |
| D. | glass |
| Answer» D. glass | |
|
Explanation: T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5). |
|
| 558. |
is the cell organelle, in which the biochemical processes of respiration and energy production occur. |
| A. | Mitochondria |
| B. | Chloroplast |
| C. | Ribosomes |
| D. | Nucleus |
| Answer» A. Mitochondria | |
|
Explanation: Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. |
|
| 559. |
Amount of water vapour in a unit volume (Cubic metre) of air is called: |
| A. | Mixed ratio |
| B. | relative humidity |
| C. | absolute humidity |
| D. | specific humidity |
| Answer» C. absolute humidity | |
|
Explanation: Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3). |
|
| 560. |
Which waves cannot be transmitted through vacuum - |
| A. | Light |
| B. | Heat |
| C. | Sound |
| D. | Electromagnetic |
| Answer» C. Sound | |
|
Explanation: Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel. |
|
| 561. |
Super cooling stands for cooling of a liquid – |
| A. | at freezing point |
| B. | below freezing point |
| C. | at melting point |
| D. | above melting point |
| Answer» B. below freezing point | |
|
Explanation: Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling. |
|
| 562. |
Alcohol is more volatile than water because is lower than water. |
| A. | its boiling point |
| B. | its density |
| C. | its viscosity |
| D. | its surface tension |
| Answer» A. its boiling point | |
|
Explanation: Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower |
|
| 563. |
The boiling point of water depends upon the – |
| A. | atmospheric pressure |
| B. | volume |
| C. | density |
| D. | mass |
| Answer» A. atmospheric pressure | |
|
Explanation: The boiling point corresponds of water to the ternperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on theatmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases. |
|
| 564. |
The loudness of sound depends upon |
| A. | Velocity |
| B. | Pitch |
| C. | Amplitude |
| D. | Wavelength |
| Answer» C. Amplitude | |
|
Explanation: Loudness is the characteristic of a sound that is primarily a psychological correlate of physical strength (amplitude). |
|
| 565. |
If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this? |
| A. | Newton first law |
| B. | Newton second law |
| C. | Newton third law |
| D. | Principle of conservation of linear momentum |
| Answer» D. Principle of conservation of linear momentum | |
|
Explanation: Principle of conservation of linear momentum states If no external force acts on asystem of bodies, the total linear momentum of the system of bodies remains constant. |
|
| 566. |
Who among the following is the scalar quantity . |
| A. | force |
| B. | pressure |
| C. | velocity |
| D. | acceleration |
| Answer» B. pressure | |
|
Explanation: Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it. |
|
| 567. |
When net torque is zero, will be constant - |
| A. | force |
| B. | angular momentum |
| C. | linear momentum |
| D. | acceleration |
| Answer» B. angular momentum | |
|
Explanation: Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant. |
|
| 568. |
Elecronegativity is the measure of - |
| A. | Metallic character |
| B. | Non-metallic character |
| C. | Basic Character |
| D. | None of these |
| Answer» B. Non-metallic character | |
|
Explanation: Electronegativity cannot be directly measured and must be calculated from other atomic or molecular properties. Several methods of calculation have been proposed, and although there may be small differences in the numerical values of the electro negativity, all methods show the same periodic trends between elements. |
|
| 569. |
Which of the following waves cannot be polarized? |
| A. | Radio |
| B. | Ultra violet |
| C. | Infrared |
| D. | Ultrasonic |
| Answer» D. Ultrasonic | |
|
Explanation: Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane. |
|
| 570. |
Which one of the following is a vector quantity? |
| A. | Momentum |
| B. | Pressure |
| C. | Energy |
| D. | Work |
| Answer» A. Momentum | |
|
Explanation: A vector quantity is a quantity that is fully described by both magnitude and direction. |
|
| 571. |
If the angle of incidence formed on a concave mirror at a point is 30° then the angle of reflection will be: |
| A. | 15° |
| B. | 30° |
| C. | 60° |
| D. | 90° |
| Answer» B. 30° | |
|
Explanation: The angle between the incident ray and the normal is known as the angle of inci dence. The angle between the reflected ray and the normal is known as the angle of reflection. |
|
| 572. |
Which among the following is not a unit of distance? |
| A. | Light year |
| B. | Longsec |
| C. | Astronomical unit |
| D. | Parsec |
| Answer» B. Longsec | |
|
Explanation: Longsec is unit of parse, parse is used to allocate distance to astronomical bodies beyond the solar system. |
|
| 573. |
The rotational effect of a force on a body about an axis of rotation is described in terms of the |
| A. | Centre of gravity |
| B. | Centripetal force |
| C. | Centrifugal force |
| D. | Moment of force |
| Answer» D. Moment of force | |
|
Explanation: The rotational effect of a force on a body about an axis of rotation is described in terms of the Moment of force. |
|
| 574. |
Radian per second is unit of . |
| A. | Momentum |
| B. | Moment of Inertia |
| C. | Frequency |
| D. | Angle Velocity |
| Answer» D. Angle Velocity | |
|
Explanation: The SI unit of angular velocity is radians per second. |
|
| 575. |
Sound of frequency below 20 Hz is called . |
| A. | audio sounds |
| B. | infrasonic |
| C. | ultrasonic |
| D. | supersonics |
| Answer» B. infrasonic | |
|
Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz. |
|
| 576. |
Which among the following is not an inner planet? |
| A. | Mercury |
| B. | Saturn |
| C. | Venus |
| D. | Earth |
| Answer» B. Saturn | |
|
Explanation: The inner planets (in order of distance from the sun, closest to furthest) are Mercury. Venus, Earth and Mars. |
|
| 577. |
What is the phenomenon which established the transverse nature of light? |
| A. | Reflection |
| B. | Interference |
| C. | Diffraction |
| D. | Polarisation |
| Answer» D. Polarisation | |
|
Explanation: The phenomena which proves the transverse nature alight is polarization. Since the intensity of polarized light on passing through a tourmaline crystal changes, with the relative orientation of its crystallo-graphic axes with that of the polarizer, therefore light must consist of transverse waves. Transverse waves are waves that are oscillating perpendicularly to the direction of propagation |
|
| 578. |
During combustion of unsaturated compounds a is seen. |
| A. | clean flame |
| B. | blue flame |
| C. | red flame |
| D. | yellow flame |
| Answer» D. yellow flame | |
|
Explanation: When saturated compounds are burnt in air,they give a clear(blue) flame due to complete combustion. However the burning of unsaturated compounds (alkenes and alkynes) gives a sooty (yellowish) flame due to incomplete combustion. |
|
| 579. |
Which one among the following doesn't have any effect on velocity of sound? |
| A. | Pressure |
| B. | Temperature |
| C. | Humidity |
| D. | Density |
| Answer» C. Humidity | |
|
Explanation: The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. In most of the cases, it is density which matters. Sound travels faster through denser air (or other material). The density of air is affected by atmospheric pressure, temperature, and altitude. |
|
| 580. |
When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are – |
| A. | longitudinal |
| B. | transverse |
| C. | both longitudinal and transverse |
| D. | waves are not produced |
| Answer» B. transverse | |
|
Explanation: The waves produced on the surface of water in the pond is an example of transverse waves as particles of the medium do not move along with the wave. Only the disturbance is carried forward. Another example of such waves is the vibrations of a string. |
|
| 581. |
A cyclone is an engineering device that is used to - |
| A. | transport materials |
| B. | segregate particles |
| C. | control switching devices |
| D. | model fractals |
| Answer» B. segregate particles | |
|
Explanation: When removing particulate matter from liquid, a hydrocyclone issued; while from gas, a gas cyclone is used. |
|
| 582. |
The density of water is 1 g/cc. This is strictly valid at – |
| A. | 0°C |
| B. | 4°C |
| C. | 25°C |
| D. | 100°C |
| Answer» B. 4°C | |
|
Explanation: Water never has an absolute density because its density varies with temperature. Water has its maximum density of 1 g/cm3 at 4 degrees Celsius. When the temperature changes from either greater or less than 4 degrees, the density will become less than 1 g/cm3. Water has the maximum density of 1 g/cm3 only when it is pure water. |
|
| 583. |
Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice- creams and jellies? |
| A. | Agar |
| B. | Chlorella |
| C. | Spirullina |
| D. | Gymnosperms |
| Answer» A. Agar | |
|
Explanation: Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies. |
|
| 584. |
In an electric motor, the energy transformation is from . |
| A. | electrical to chemical |
| B. | chemical to light |
| C. | mechanical to electrical |
| D. | electrical to mechanical |
| Answer» D. electrical to mechanical | |
|
Explanation: An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy intoelectrical energy and is done by an electric generator. |
|
| 585. |
A radioactive substance does not undergo any change (in mass or charge) during – |
| A. | ganuna-emission |
| B. | oxidation |
| C. | alpha-emission |
| D. | beta-emission |
| Answer» A. ganuna-emission | |
|
Explanation: Gamma-rays do not carry any charge. These rays do not have any mass and hence can not be considered to be made up of particles. |
|
| 586. |
On a rainy day, small oil films on water show brilliant colors. This is due to - |
| A. | dispersion |
| B. | interference |
| C. | diffraction |
| D. | polarization |
| Answer» B. interference | |
|
Explanation: The combination of two or more electromagnetic waveforms to form a resultant wave in which the displacement is either reinforced or cancelled. |
|
| 587. |
The waveform of a certain signal can be studied by – |
| A. | Spectrometer |
| B. | Cathode ray oscilloscope |
| C. | p - n junction diode |
| D. | Sonometer |
| Answer» D. Sonometer | |
|
Explanation: A spectrometer is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum. Cathode ray oscilloscope is an electronic display device containing cathoderay tube (CRT) that generates an electron beam that is used to produce visible patterns or graphs on a phosphorescent screen. |
|
| 588. |
Ultrasonic waves are produced by making use of - |
| A. | ferro magnetic material |
| B. | ferri magnetic material |
| C. | piezo electric material |
| D. | pyro electrical material |
| Answer» C. piezo electric material | |
|
Explanation: In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves). |
|
| 589. |
Least audible sound for most of the human ear is – |
| A. | 10.0 μ bar |
| B. | 0.0002 μ bar |
| C. | 0.005 μ bar |
| D. | 5.0 μ bar |
| Answer» B. 0.0002 μ bar | |
|
Explanation: Least audible sound for most of the human ear is 2 x 10-5 pascal. The generally accepted standard range of audible frequencies is 20 to 20,000 Hz. |
|
| 590. |
Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as: |
| A. | Mixing ratio |
| B. | Relative humidity |
| C. | Absolute humidity |
| D. | Specific humidity |
| Answer» C. Absolute humidity | |
|
Explanation: The relative humidity of air at a given temperature is the ratio of mass of water vapour actually present in a certain volume of air to the mass of water vapour required to saturate the same volume of air at the same temperature, multiplied by 100. |
|
| 591. |
Which of the following is a conductor of electricity? |
| A. | Rubber |
| B. | Pure water |
| C. | Salt water |
| D. | Benzene |
| Answer» C. Salt water | |
|
Explanation: Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions. |
|
| 592. |
The opening and closing of the stomatal pores is a function of the - |
| A. | Guard cells |
| B. | Chloroplast |
| C. | Xylem |
| D. | Phloem |
| Answer» A. Guard cells | |
|
Explanation: The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink. |
|
| 593. |
Which one among the following substances evolved heat when dissolved in water? |
| A. | Glucose |
| B. | Fructose |
| C. | Quick lime |
| D. | Salt peter |
| Answer» C. Quick lime | |
|
Explanation: Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature.When limestone is heated, at about 1000° C it undergoes thermal decomposition. |
|
| 594. |
In the remote control of television, electromagnetic waves used are – |
| A. | ultraviolet |
| B. | microwave |
| C. | radiowave |
| D. | infrared |
| Answer» D. infrared | |
|
Explanation: All electromagnetic waves used are infrared. |
|
| 595. |
Heat flows as a result of difference of |
| A. | Temperature |
| B. | Density |
| C. | mass |
| D. | Volume |
| Answer» A. Temperature | |
|
Explanation: Heat flow moves energy from a higher temperature to a lower temperature. The bigger the difference in temperature between two objects, the faster heat flows between them. |
|
| 596. |
Sound and light waves both . |
| A. | have similar wavelength |
| B. | obey the laws of reflection |
| C. | travel as longitudinal waves |
| D. | travel through vacuum |
| Answer» B. obey the laws of reflection | |
|
Explanation: The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane. |
|
| 597. |
Radioactive elements can be traced out in living cell through a technique called – |
| A. | Centrifugation |
| B. | Chromatography |
| C. | Auto radiography |
| D. | All the above |
| Answer» C. Auto radiography | |
|
Explanation: Radioactive elements can be traced out in living cell through a technique called Autoradiography. |
|
| 598. |
Human beings can hear the sound range between: |
| A. | 10 to 20 decibels |
| B. | 100 to 150 decibels |
| C. | 50 to 60 decibels |
| D. | None of the above |
| Answer» D. None of the above | |
|
Explanation: The most accepted sound range of human being is 0 to 120 decibels. |
|
| 599. |
Solids which conduct electricity at higher temperature but not at lower temperature are called |
| A. | super-conductor |
| B. | metallic-conductor |
| C. | semi-conductor |
| D. | insulator |
| Answer» C. semi-conductor | |
|
Explanation: Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor. |
|
| 600. |
In a filament type light bulb most of the electric power consumed appears as – |
| A. | visible light |
| B. | infra-red rays |
| C. | ultra-violet rays |
| D. | fluorescent light |
| Answer» B. infra-red rays | |
|
Explanation: When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The filament's temperature is very high, generally over 2,000°C. At this high temperature of 2,000°C, about 5 percent of the electrical energy converts into visible light and rest of it is emitted as heat or infrared radiation. |
|
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.