Description : Molecular oxygen is said to be paramagnetic. This indicates that molecular oxygen: w) is a gas at room temperature x) forms molecules containing two oxygen atoms y) has an approximate molecular weight of 32 z) has unpaired electrons
Last Answer : ANSWER: Z -- HAS UNPAIRED ELECTRONS
Description : Equal masses of oxygen, hydrogen and methane are taken in a container in identical conditions. Find the ratio of their moles.
Last Answer : Equal masses of oxygen, hydrogen and methane are taken in a container in identical conditions. Find the ratio of their ... 1 : 8` D. `16 : 1 : 8`
Description : What data does a sample of pure water irrespective of its source contains 11.1 hydrogen and 88.9 oxygen support?
Last Answer : It might have supported Proust's law or the law of definitecomposition, or law of constant composition. But unfortunately thedata used are not accurate. The correct proportions, based onrelative atomic masses of hydrogen and oxygen being 1.008 and15.999 give the results as 11.2% and 88.8%.
Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel
Last Answer : (C) Excess air has been used for combustion
Description : An approximate estimation of total dissolved solids of a given water sample is often made by measuring (a) Electrical conductivity of the water sample (b) Electro-magnetic conductivity of the water sample (c) Sound conductivity of the water sample (d) Thermal conductivity of the water sample
Last Answer : (a) Electrical conductivity of the water sample
Description : If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is A. 100 mg/l B. 200 mg/l C. 300 mg/l D. 400 mg/l
Last Answer : ANS: D
Description : A pair of rivers that mark the approximate southern limit of the Ice Age glaciers in North America are the Missouri and which of the following? w) St. Lawrence x) Ohio y) Delaware z) Tennessee
Last Answer : ANSWER: X -- OHIO
Description : A water sample, which did not give lather with soap, was found to contain Ca(HCO3)2 and Mg(HCO3)2.
Last Answer : A water sample, which did not give lather with soap, was found to contain Ca(HCO3)2 and Mg ... with soap? Explain with the help of chemical reactions.
Description : An organic compound contain 69% carbon and 4.8% hydrogen, the remaining being oxygen. Calculate the masses of carbon dioxide and water produced when 0.20g of this substance is subjected to complete combustion.
Last Answer : Calculation of mass of CO2 produced: Mass of compound =0.20g %C =12 x C 69=12*mass of CO2 formed*100/44*0.2 Mass of CO2 formed =69*44*.2/12*100 = 0.506g Similarly, % H =2* mass of H2Oformed*100/18* ... compound 4.8=2* mass of H2Oformed*100/18* 0.2 Mass of H2Oformed =4.8*18*0.2/2*100 =0.0864g
Description : In a thunderstorm the formula M t 5.1 Mt5.1 gives the approximate distance M M in miles from a lightning strike if it takes t t seconds to hear the thunder after seeing the lightning. If you are 8.9 m?
Last Answer : Need answer
Description : The ultra violet radiations of the Sun do not reach the Earth because the upper layers of the atmosphere contain (a) oxygen (b) helium (c) ozone (d) hydrogen
Last Answer : Ans:(c)
Description : A gaseous fuel in order to develop luminosity on burning, must contain (A) Carbon monoxide (B) Hydrocarbons (C) Hydrogen (D) Oxygen
Last Answer : (B) Hydrocarbons
Description : All proteins contain at least 5 specific elements. Four of them are carbon, oxygen, hydrogen, and nitrogen. What is the fifth element?
Last Answer : ANSWER: SULFUR
Description : The term territorial water means – (1) The water found within the country in form of rivers and lakes (2) The water secured from other countries (3) The water which is supplied to other countries (4) Water of the sea located close to the coast of a country
Last Answer : (4) Water of the sea located close to the coast of a country Explanation: Territorial waters, or a territorial sea, as defined by the 1982 United Nations Convention on the Law of the Sea ... of the state, although foreign ships (both military and civilian) are allowed innocent passage through it.
Description : The term territorial water means (1) The water found within the country in form of rivers and lakes (2) The water secured from other countries (3) The water which is supplied to other countries (4) Water of the sea located close to the coast of a country
Last Answer : Water of the sea located close to the coast of a country
Description : A Sample of a compound contains 64 g of copper and 16 g of oxygen what is the ratio of mass to copper of oxygen?
Last Answer : ?
Description : When assisting the patient to interpret a negative HIV test result, the nurse informs the patient that the results mean a) his body has not produced antibodies to the AIDS virus. A negative test ... When antibodies to the AIDS virus are detected in the blood, the test is interpreted as positive.
Last Answer : a) his body has not produced antibodies to the AIDS virus. A negative test result indicates that antibodies to the AIDS virus are not present in the blood at the time the blood sample for the test is drawn.
Description : Preliminary project report for a road project must contain (A) The detailed estimated cost based on detailed design (B) The several alternatives of the project that have been considered (C ... , traffic survey, concept design and approximate cost (D) The contract documents for inviting tenders
Last Answer : (C) The soil survey, traffic survey, concept design and approximate cost
Description : The ‘Chilka lake region’ lies in between the deltas of which rivers– -Do You Know?
Last Answer : answer:
Description : What rivers form the boundaries of the Great Lake States?
Last Answer : Which river form the boundaries of the Great Lakes states
Description : The ‘Chilka lake region’ lies in between the deltas of which rivers–
Last Answer : Mahahadi and Godavari
Description : If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is A. 50 ppm B. 100 ppm C. 150 ppm D. 200 ppm
Description : If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is A. 200 ppm B. 225 ppm C. 250 ppm D. None of these
Last Answer : ANS: C
Description : In deep-sea diving, divers use a mixture of gases consisting of oxygen and – (1) hydrogen (2) nitrogen (3) argon (4) helium
Last Answer : (2) nitrogen Explanation: Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: ... Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.'
Description : In deep-sea diving, divers use a mixture of gases consisting of oxygen and (1) hydrogen (2) nitrogen (3) argon (4) helium
Last Answer : nitrogen
Description : Alkali metal hydrogen fluorides have a formula `M[HF_2]`. They are found to contain a linear symmetrical anion having an overall F—H—F distance of 2.2
Last Answer : Alkali metal hydrogen fluorides have a formula `M[HF_2]`. They are found to contain a linear symmetrical ... F-atoms through two T bonds in the anion.
Description : What is the approximate weight in pounds of the atmosphere on a 1 sq. ft. surface at sea level? w) 15 lbs. x) 1500 lbs. y) 2100 lbs. z) 20,000 lbs.
Last Answer : ANSWER: Y -- 2100 LBS.
Description : The natural water content of the soil sample was found to be 40%, specific gravity is 2.7 and void ratio 1.2; then the degree of saturation of the soil will be (a) 100% (b) 69% (c) 87% (d) 90%
Last Answer : (d) 90%
Description : Determination of water content of a soil sample suspected to contain gypsum is made by drying the sample for longer period at a temperature not more than (A) 60°C (B) 80°C (C) 100°C (D) 110°C
Last Answer : (B) 80°C
Description : Find the decimal expansion of 7/22 .Explain why it is taken as the approximate value of pi -Maths 9th
Last Answer : 3.1564267467648582474747477647908765434567896542345678765431222245775583585.................................. or 22/7 is the value f pi
Description : Pick out the wrong statement. (A) Indian coals on an average contain 25-30% ash as against 10-12% ash in imported coking coal (B) Ammonia is recovered in the form of ammonium sulphate in direct ... indicates poor caking properties of coal (D) Wash oil is used for scrubbing Benzol from coke oven gas
Last Answer : (C) A high swelling index number of coking coal indicates poor caking properties of coal
Description : What structure in the arm of a human is found to carry oxygen red blood cells and if so what do they also contain?
Description : Go through the following graph and answer the following questions. At what approximate temperature, zinc and carbon have equal affinity for oxygen.
Last Answer : Go through the following graph and answer the following questions. At what approximate temperature, zinc and carbon have ... 500^(@)C` D. `1200^(@)C`
Description : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain after 3000 years,
Last Answer : A radioactive sample has a half life 1500 years. A sealed tube conataining 1g of the sample will contain ... g of the sample D. 0.01g of the sample
Description : When viewed under a microscope a sample of tissue reveals striations and long thin fibers that contain many nuclei and mitochondria. What type of tissue is most likely being viewed?
Description : What is the ratio of hydrogen to oxygen in water ?
Last Answer : The ratio of hydrogen to oxygen in water is 2: 1
Last Answer : In water Oxygen, Of hydrogen Ratio 1 : 2
Description : What is the Ratio of hydrogen to oxygen in water by volume is?
Last Answer : The ratio is 2:1.. There are two Hydrogen atoms for every Oxygenatom in a water molecule.
Description : Water consists of hydrogen and oxygen by weight in the ratio?
Last Answer : 1:8.
Description : Pick up the incorrect statement from the following: (A) The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water (B) Higher value of pH ... value of pH means higher hydrogen ion contraction (D) Lower value of pH gives alkaline solution
Last Answer : (D) Lower value of pH gives alkaline solution
Description : X, Y , Z are three towns on a lake which flows uniformly. Y is equidistant from X and Z. A man rows from X to Y and returns in 20hrs. He can row from X to Z in 8 hr. The ratio of speed of the man in still water to the speed of the current is. A) 3:5 B) 5:3 C) 2:3 D) None of these
Last Answer : ANSWER: A Explanation: Let the speed of man in still water = x km/hr Speed of the current = y km/hr Speed of downstream = (x+ y) km/hr Speed of upstream = ( x - y) km/hr Let the lake be flowing from X to Z and xy = yz a ... y = 1 / 4 4x - 4y = x + y 3x = 5y x / y = 3 / 5 x : y = 3 : 5
Description : On analysis, a certain compound was found to contain 254 g of iodine (at. Mass 127) and 80 g oxygen (at. Mass 16). What is the formula of the compound
Last Answer : On analysis, a certain compound was found to contain 254 g of iodine (at. Mass 127) and 80 g oxygen (at. Mass 16). ... C. `I_(5)O_(3)` D. `I_(2)O_(5)`
Description : What is the ratio of hydrogen to oxygen in carbohydrates ?
Last Answer : Carbohydrates contain 2: 1 of hydrogen and oxygen .
Description : If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound? (1) 4 : 1 (2) 2 : 1 (3) 1 : 16 (4) 1 : 4
Last Answer : (4) 1 : 4
Description : Hydrogen and oxygen in carbohydrates are present in the ratio
Last Answer : 2:1.
Last Answer : 1 : 4
Description : A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of A. Carbondioxide gas B. Hydrogen sulphide gas C. Methane gas D. Petrol vapours
Description : Sea water is saltier than rain water because – (1) rivers wash away salts from earth and pour them into the sea (2) sea beds have salt producing mines (3) sea animals are salt producing (4) the air around the sea is saltish
Last Answer : (1) rivers wash away salts from earth and pour them into the Explanation: Sea water is saltier than rain water because rivers wash away salts from earth and pour them into the sea.
Description : Sea water is saltier than rain water because – (1) Sea animals are salt producing (2) The air around the sea is saltish (3) Rivers wash away salts from earth and pour them into the sea (4) Sea beds have salt producing mines
Last Answer : (3) Rivers wash away salts from earth and pour them into the sea Explanation: Seawater is salty because rainwater dissolves the salt minerals found in soil and rocks as it travels through rivers ... sea The rain that falls on the land contains some dissolved carbon dioxide from the surrounding air.