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 : Name the instruments used for measuring each of the following: (i) Pressure (ii) Voltage (iii) Purity of milk (iv) Temperature (v) Velocity of wind
Last Answer : Answers: (i). Barometer (ii). Voltmeter (iii). Lactometer (iv). Thermometer (v). Anemometer
Description : Why does the Sun appears orange-red at the time of Sunrise and Sunset.
Last Answer : The earth's dust, gas and air particles scatter the sun's light in different directions. Violet light has a peculiar property due to which it gets scattered the most. Red light gets scattered the least. At ... earth. Since red is scattered the least, it is this colour that we see as it reaches us.
Description : Common food sources of Vitamin A are:------? A. Milk, eggs, butter, cheese, cream, and liver B. White sugar, honey, and sugar cane C. Broccoli, apricots, cantaloupe, carrots, sweet potato, spinach D. Both A and C (Answer)
Last Answer : D. Both A and C (Answer)
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 organs responsible for the following functions present in either elements, plants or human. a) Vision b) Reproduction c) Hormone secretion d) Blood pumping e) Food storage
Last Answer : Answers: a) Eye b) Gonades c) Glands d) Heart e) Stem and stomach
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 : Name the two proteins found in milk.
Last Answer : Ans. albumin, globulin and casein
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 : A balanced diet contains (a) Animal protein (b) Macro and micronutrients (c) Food nutrients for growth and maintenance (d) Butter and ghee
Last Answer : Ans:(c)
Description : Many times food cravings are our bodies way of telling us something is lacking in our diet, so what does my body want that I crave bread and butter?
Last Answer : According to WebMD, carb cravings indicate low serotonin levels. and probably cancer http://www.webmd.com/depression/features/craving-carbs
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 : Why climbers get their food by climbing on other trees ?
Last Answer : Ans: By climbing on other trees, they get close to the light source.
Description : What is the endocrine system? Write the names and function of any eight endocrine glands. (2,8)
Last Answer : Endocrine System The endocrine system is an integrated system of small organs which involve the release of extracellular signaling molecules known as hormones. The endocrine system is instrumental in ... --Endogenous opiates --Neuromodulators V. Adipose tissue a. Leptin --Regulates Fat Deposition
Description : Explain the structure of Earth and its Atmosphere
Last Answer : Atmosphere of Earth : Gaseous envelope of the Earth, or any other celestial object. The Earth's atmosphere is made up of nitrogen (78 per cent), oxygen (21 per cent), argon (0.9 per cent), carbon dioxide (0 ... (3.5 mi), it is 380 torrs; half of all the air in the atmosphere lies below this level.
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 : The following contains the least cholesterol: (A) Milk (B) Meat (C) Butter (D) Cheese
Last Answer : Answer : A
Description : Which of the following has the highest cholesterol content? (A) Meat (B) Fish (C) Butter (D) Milk
Last Answer : Answer : C
Description : A poor source of Vitamin D is (A) Egg (B) Butter (C) Milk (D) Liver
Description : Give scientific reason of the following 1. rain water is more fertile than water from tube well 2. the man-hole covers are generally round 3. clothes of a moving dancer bulge 4. peoples are advised not to stand near a fast moving train 5. the image of a tree looks inverted on the bank of a lake
Last Answer : 1. rain water is more fertile than water from tube well after falling, the rain drops start moving on slope side, during this movements, the soluble salts and minerals solves from top soil in the ... a lake This is due to the law of reflection according to which image is formed far and inverted
Description : A person who lives exclusively on milk, egg and bread is likey to become a victim of which desease? -General Knowledge
Last Answer : The answer is 'Scurvy'
Last Answer : answer:
Description : A person who lives exclusively on milk, egg and bread is likey to become a victim of which desease?
Last Answer : Scurvy
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.
Description : The dogs pant, the birds open their mouth and the elephants move rapidly their ears.
Last Answer : I think all of these do not sweat, they use the above mentioned mechanisms to cool themselves
Description : Define RECEPTORS in man. Name different receptor organs in human body.
Last Answer : In a sensory system, a sensory receptor is a sensory nerve ending that recognizes a stimulus in the internal or external environment of an organism. Following are the different sensory ... to temperature, either heat, cold or both Electromagnetic Receptors's respond to electromagnetic waves
Description : Define the following a) Amphibion b) Synchronous satellite c) Big Dipper d) Fermentation e) Millennium Bug
Last Answer : (a) Amphibion cold-blooded vertebrate animal able to live both on land and water (b) Synchronous satellite A satellite in a synchronous orbit A synchronous orbit is one in which an orbiting object ... an inability in older computing software to deal correctly with dates of 1 January 2000 or later.