Description : Give scientific reasons (in not more than four lines each) for the following: (i) Meat takes longer to cook on the mountains (ii) Water remains cool in earthen pitchers (iii) Ice and salt ... to sleep under trees during the night. (v) Greenhouse operators paint their glass roofs white in summer.
Last Answer : (i) Meat takes longer to cook on the mountains: The atmospheric pressure decreases as the altitude increases. The boiling point of water is 100 c at standard atmospheric pressure. At the mountains this ... of light to a maximum. And therefore white colour is painted on the roofs in the summer.
Description : Explain any five of the following terms (in not more than four lines each): (i) Osmosis Glycolysis (ii) Phototaxis (iii) Transpiration (iv) Saponification (v) Emulsion
Last Answer : (i) Osmosis: osmosis, in botany and chemistry, the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the (selecyively permeable membrane ... in a second liquid with which the first will not mix: an emulsion of oil in vinegar
Description : Differentiate between any five of the following. (i) Artery and vein (ii) Hard water and soft water (iii) E-mail and Snail mail (iv) Apes and monkey (v) Hydrostatics and hydrodynamics (vi) Comet and ... (vii) Barrage and dam (viii) Electron and hole (ix) Isobars and isotopes (x) Autopsy and biopsy
Last Answer : Answers: (i) Artery and vein: Arteries: Muscular blood vessels that carry blood away from the heart. All arteries, with the exception of the pulmonary and umbilical arteries, carry oxygenated blood ... to determine cause of death Biopsy: Removal and study of a tissue sample for diagnostic purposes
Description : Explain the following: (i) Blood group (ii) Short circuit (iii) Short sight (iv) International date line (v) Plaster of Paris
Last Answer : Answers: (i) Blood group A blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood ... calcium sulfate hemihydrate, nominally CaSO4 0.5H2O. It is created by heating gypsum to about 150 °C.
Description : Name the quantities which are measured by the following units. (i) Newton (ii) Joule (iii) Watt (iv) Volt (v) Light year (vi) Angstrom (vii) Acre-foot (viii) Becquerel (ix) Hertz (x) Cusec
Last Answer : Answers: (i) Force (ii) Work Energy (iii) Power of electricity (iv) Potential difference (v) Distance of stars and planets (vi) Length (vii) Volume (viii) Radioactivity (ix) Frequency (x) Rate of flow of water
Description : Which part/organ of the human body do the following belong: (i) Eustachian tube (ii) Cartilage (iii) Auricle (iv) Tendon (v) Dendrites
Last Answer : Answers: (i) Eustachian tube...... Ear (ii) Cartilage............ ... Connective tissue (iii) Auricle............... .. Ear (iv) Tendon ................Muscle (v) Dendrites... ........... Neuron
Description : Which quantity do the following units measure: (i) Volt (ii) Coulomb (iii) Walt (iv) Ohm (v) Mho (vi) Ampere (vii) Dyne (viii) Celsius (ix) Joule (x) Calorie
Last Answer : Answers: (i) Voltage (ii) Charge of Electricity (iii) Power (iv) Resistance (v) Conductivity (vi) Current (vii) Force (viii) Temperature (ix) Energy (x) Heat
Description : What is the difference between. (i) BIT and BYTE (ii) RAM and ROM (iii) C.U. and A.L.U (iv) Hardware and Software (v) Personal computer and mainframe
Last Answer : Personal computer and mainframe: Personal Computer (PC): Short for personal computer or IBM PC. The first personal computer produced by IBM was called the PC, and increasingly the term ... mainframes and minicomputers is vague, depending really on how the manufacturer wants to market its machines.
Description : Compare floor inspection and centralized inspection on the basis of (i) Definition. (ii) Measuring instruments used (iii) Suitability. (iv) Mode of inspection.
Last Answer : Parameters Floor Inspection Centralized Inspection Definition. Inspection is done at the place where the part is made or assembled is called floor inspection. The inspection is done ... Mode of inspection. Online inspection is possible Offline inspection needs to be done.
Description : Describe, in precise statements, various instruments which are being used in exploring the universe.
Last Answer : The universe can be explored by astronomical instruments called telescopes, and by space probes sent from earth to other planets. When using telescopes astronomers try to look at the energy being produced by the ... , 2001, at 3:46 p.m. EDT from Cape Canaveral Air Force Station, Florida, USA
Description : Explain in detail what is a balanced diet; name a nutrient present in each of the following food: 1. Apple 2. Bread 3. Meat 4. Butter 5. Orange 6. Egg 7. Milk 8. Spinach
Last Answer : Answers: 1. Vitamin C 2. Starch 3. Vitamin A 4. Vitamin A 5. Vitamin C 6. Vitamin D 7. Vitamin A, C, D 8. Vitamin K
Description : Identify the sensors for the following : i) Wind speed ii) RPM of generator shaft iii) Temperature in generator iv) Cable untwisting v) Vibration vi) Wind direction
Last Answer : i) Wind Speed : Anemometer. ii) RPM of Generator Shaft: Accelerometers. iii) Temperature in Generator: Thermistor, thermocouple, RTD. iv) Cable Untwisting : Cable Twisting sensor. v) Vibration : Accelerometer, piezoelectric. vi) Wind direction: Wind vane.
Description : Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?
Last Answer : Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.
Description : Give scientific reason of the following: (1) Pole star is always seen in the north. (2) We never see birds urinating. (3) Pasteurized milk has more nourishment than the ordinary boiled milk. (4) Bees die when they sting human beings. (5) Cloudy nights are usually warmer than the clear ones.
Last Answer : (1) Pole star is always seen in the north. Because the pole star, which we have in the south, is too faint that it cannot be seen from the naked eye. or Because the earths motion is from ... to get lost in the atmosphere, above the clouds. Ultimately, the heat produced in the vicinity is restored.
Description : Name the two proteins found in milk.
Last Answer : Ans. albumin, globulin and casein
Description : What is escape velocity? How the Satellites are launched and what are their uses?
Last Answer : Escape Velocity In physics, escape velocity is the speed where the kinetic energy of an object is equal in magnitude to its potential energy in a gravitational field. It is commonly described as the ... satellite is launched faster then 23,500 mph, it will leave the gravitational pull of the Earth.
Description : Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to ... . (A) I, II, III (B) II, III, V (C) I, II, V (D) II, IV, V
Last Answer : (B) II, III, V
Description : Compare detonation and diesel knock on the basis of (i) Fuel Ignition Temperature (ii) Compression Ratio (iii) Speed (iv) inlet temperature (v) inlet pressure (vi) cylinder wall temperature (vii) cylinder size
Last Answer : Comparison between detonation and diesel knock: Parameter To avoid Detonation in SI Engine To avoid Diesel knock i) Fuel Ignition Temperature High Low ii) Compression Ratio ... Cylinder wall temperature Low High viii) Cylinder size Small Large
Description : What are the three components of the CPU in a computer? What is the function of each?
Last Answer : Abbreviation for central processing unit, and pronounced as separate letters. The CPU is the brains of the computer. Sometimes referred to simply as the central processor,but more commonly called ... extracts instructions from memory and decodes and executes them, calling on the ALU when necessary.
Description : Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of ... Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life
Last Answer : S.No Points Pin Type insulator Suspension or Disc Type insulator 1 Position of insulator on cross arm It is fixed on top of cross arm by using galvanized steel pin. So it is ... so to maintain minimum ground clearance height of pole increase. 8 Life Less More
Description : Identify type of BJT configuration having following features : (i) BJT configuration having the least current gain. (ii) KIT configuration called as voltage follower. (iii) BJT ... configuration suitable for voltage amplification. (vi) BJT configuration having the least output impedance.
Last Answer : (i) BJT configuration having the least current gain : Common Base Configuration (ii) KIT configuration called as voltage follower: Common Collector Configuration (iii) BJT ... Emitter Configuration (vi) BJT configuration having the least output impedance: Common Collector Configuration
Description : Anemometer is an instrument meant for measuring (1) velocity (2) air masses (3) wind speed (4) temperature
Last Answer : wind speed
Description : State the uses of following instruments in survey: i)Cross staff ii) Chain iii) Pegs iv) Arrows
Last Answer : i) Cross-Staff: To set up perpendicular or right angle to given chain line OR to find foot of perpendicular from given object to a chain line. ii) Chain: Chains are used for measuring distances. iii) ... on survey lines. iv) Arrows : They are used to mark the end of each chain during chaining.
Description : Write the uses of following survey instruments i) Ranging Rod ii) Pegs iii) Cross-staff iv) Plumb bob
Last Answer : i) Ranging Rod : Ranging rod are used for ranging. ii) Pegs : Pegs are used for marking the positions of stations or terminals points of survey lines. iii) Cross-staff : It is used ... It is also used for accurate centering of the surveying instruments like theodolite, compass, plane table etc.
Description : The instruments which are used to measure the ___________ of a vibrating body are called vibration measuring instrument. (A) displacement (B) velocity (C) acceleration (D) all of the above
Last Answer : (D) all of the above
Description : List the classification of temperature measuring instruments with one example each.
Last Answer : Classification of temperature measuring instruments with one eg
Description : Why is the water in an open pond cool even on a hot summer day?
Last Answer : Answer: As the water evaporates from the open surface of a pond, heat is taken away in the process, leaving the surface cool.
Description : Why does kerosene float on water?
Last Answer : Answer: Because the density of kerosene is less than that of water. For the same reason cream rises in milk and floats at the top.
Description : Why does moisture gather outside a tumbler containing cold water?
Last Answer : Answer: The water vapour in the air condenses on cooling and appears as droplets of water.
Description : Why does ice float on water?
Last Answer : Answer: The weight of the ice block is equal to the weight of the liquid displaced by the immersed portion of the ice.
Description : Why does a small iron sink in water but a large ship float?
Last Answer : Answer: The weight of water displaced by an iron ball is less than its own weight, whereas water displaced by the immersed portion of a ship is equal to its weight (Archimedes? Principle).
Description : Why does blotting paper absorb ink?
Last Answer : Answer: Blotting paper has fine pores, which act like capillaries. When a portion of blotting paper is brought in contact with ink, ink enters the pores due to surface tension (capillary action f liquids) and is absorbed.
Description : Why is one?s breath visible in winter but not in summer?
Last Answer : Answer: In winter, water vapor contained in the breath condenses into small droplets, which become visible but in summer they are quickly evaporated and not seen.
Description : Why does a swimming pool appear less deep than is actually is?
Last Answer : Answer: The rays of light coming from the bottom of the pool pass from a denser medium (water) to a rarer medium (air) and are refracted (bend away from the normal). When the rays return to the surface, they form an image of the bottom of the pool at a point, which is little above the real position.
Description : Why is a rainbow seen after a shower?
Last Answer : Answer: After a shower, the clouds containing water droplets act like a prism through which the white light is dispersed producing a spectrum.
Description : Why is water from a hand pump warm in winter and cold in summer?
Last Answer : Answer: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
Description : Why is a compass used as an indicator of direction?
Last Answer : Answer: The magnetic needles of a compass under the influence f the earth?s magnetic field lie in a north-south direction. Hence, we can identify direction.
Description : Why does a man fall forward when he jumps out of a running train or bus?
Last Answer : Answer: He is in motion while in the train or bus. When he jumps out, his feet comes to rest while touching the ground but his upper portion which is still in motion propels him forward.
Description : Why does an electric bulb explode when it is broken?
Last Answer : Answer: The bulb encompasses partial vacuum and as it breaks, air rushes in causing a small explosion.
Description : Why does smoke curl up in the air?
Last Answer : Answer: Smoke contains hot gases which being lighter in weight, follows a curved path because of the eddy currents that are set up in the air.
Description : Why do we lean forward while climbing a hill?
Last Answer : Answer: In order to keeps the vertical line passing through our centre of gravity always between our feet, which is essential to attain equilibrium or stability.
Description : Why does a balloon filled with hydrogen rise in the air?
Last Answer : Answer: Weight of hydrogen is less than the weight of air displaced by it. In balloons hydrogen is normally filled because it is lighter than air.
Description : Why are water or mercury droplets always round when dropped on a clean glass?
Last Answer : Answer: The surface of a liquid is the seat of a special force as a result of which molecules on the surface are bound together to form something like a stretched membrane. They tend to compress the ... which causes the drop to take a round shape as for a given mass he sphere has minimum volume.
Description : Why cannot a copper wire be used to make elements in electric heater?
Last Answer : Answer: Copper melts at 108.3^0C and forms a black powder on reacting with atmospheric oxygen. For heater elements a metal should have more resistance to produce heat.
Description : Why is a small gap left at the joint between two rails?
Last Answer : Answer: To permit expansion of rails due to heat generated by friction of a moving train.
Description : Why does a corked bottle filled with water burst if left out on a frosty night?
Last Answer : Answer: Because of low temperature the water inside the bottle freezes. On freezing it expands, thereby its volume increases and pressure is exerted on the walls.
Description : Why do we bring our hands close to the mouth while shouting across to someone far away?
Last Answer : Answer: By keeping hands close to mouth the sound is not allowed to spread (Phenomenon of diffraction of sound) in all direction, but is directed to a particular direction and becomes louder.
Description : We never see birds urinating.
Last Answer : Ans: The birds do not have a urinary system like other living beings which possess urinary excretory organs. In the birds the urine is excreted from body without special organs.
Description : A geostationary satellite appears standstill to a viewer on the equator of earth.
Last Answer : Because these satellites are in the geosynchronous orbit (an orbit around the Earth with an orbital period matching the Earth's sidereal rotation period) Geostationary orbit is a type of geosynchronous orbit that is directly above the equator
Description : The manholes covers are generally round.
Last Answer : It is impossible to drop a round lid into a smaller round hole. It is because round is the only shape that if turned or flipped over, it still retains the same length across its center. If you used ... it on its edge. A round cover contains less metal than a same-sized cover of any other shape.