Description : Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter? (a) Larvae could appear in decaying organic matter. (b) Microbes did not ... matter. (d) Meat was not spoiled, when heated and kept sealed in a vessel.
Last Answer : (d) Meat was not spoiled, when heated and kept
Description : 40000 litre of oil of density 0.9 g cc is pumped from an oil tanker ship into a storage tank at 10 m higher level than the ship in half an hour.
Last Answer : 40000 litre of oil of density 0.9 g cc is pumped from an oil tanker ship into a storage tank at 10 ... an hour. What should be the power of the pump?
Description : 1.12 litre dry chlorine gas at STP was passed over a heated metal when 5.56 g of chloride of the metal was formed. What is the equivalent weight of th
Last Answer : 1.12 litre dry chlorine gas at STP was passed over a heated metal when 5.56 g of chloride of ... formed. What is the equivalent weight of the metal ?
Description : Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre. (A) 22 (B) 42 (C) 332 (D) 1050
Last Answer : (B) 42
Description : The calorific value of fuel is expressed in unit called a) kilojoule per litre c) kilogram per millilitre b) kilogram per gram d) kilo joule per kilogram
Last Answer : d) kilo joule per kilogram
Description : In order to figure out what is in a sealed box, you perform some tests. The box seems heavy for its size and is harder to remove from a steel table than when placed on a concrete floor. What kind of object could be inside the box?' -Riddles
Last Answer : The answer is magnet because it would be really hard to move a magnet across a steel table since it would attract to the steel-not making it able to move.
Description : Mark the correct option remittances sent by post a) When a remittance is to be sent by post, the money should be placed in Leather cash bag and cash sealed by treasure. b) The remittance advice and ... he should be required to grant a receipt for the same in treasurer cash book. d) All the above
Last Answer : d) All the above
Description : Minimum horsepower of pump required for filling 50m3 water tank, 20 metres high from ground in 30 minutes by lifting water from a well 5 metres below the ground level is a.5.45 KW b.7.5 KW c.6.81 KW d.Tapered bearing e.66.8 KW
Last Answer : c. 6.81 KW
Description : How many, and which type of tropical fish can I comfortably have in a 200 litre tank?
Last Answer : I like fancy guppies, swordtails, Angelfish (a little agressive) and even the ugly little catfish types. That tank would hold a pretty good number of fish if well planted.
Description : A tank can be filled by an inlet tap at the rate of 8 litres per minute. A leak in the bottom of a tank can empty the full tank in 16 hours. When the tank is full, the inlet is opened and due to ... hours. How many litres does the tank hold? A) 8000 litre B) 9560 litre C) 8525 litre D) 9600 litre
Last Answer : D Part emptied by the leak in 1 hour = 1/16 part filled by (leak & inlet open) in 1 hour = 1/80 Part filled by the inlet tap in 1 hour = 1/16 – 1/80 = 1/20 Inlet tap fills the tank in = 20 hours Inlet tap fills water at the rate of 8 litres a minute. Capacity of tank = 20 * 60 * 8= 9600 litre
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 : In the dissociation of `I_(2)(g)` at 1000 K in a container of 1 litre :- `I_(2)(g)rArr2I^(-)(g),K_(c)=10^(10)` Select the correct relation :-
Last Answer : In the dissociation of `I_(2)(g)` at 1000 K in a container of 1 litre :- `I_(2)(g)rArr2I^(-)(g),K_(c)=10^(10)` ... I^(-)]` D. `[I_(2)]=(1)/(2)[I^(-)]`
Description : According to IS : 2720 - 1965, the composition of a dispersing solution used in pipette analysis for determining the size of particles, is (A) sodium-hexametaphosphate 33 g, sodium carbonate 7 g ... -hexametaphosphate 23 g, sodium carbonate 17 g and distilled water one litre (D) None of these
Last Answer : Answer: Option A
Description : The prognosis of teeth with apical resorption is : A. Poor B. Good if apex can be sealed C. Dependant upon periapical surgery D. Contingent upon systemic antibiotic therapy combined with treatment of the canal
Last Answer : B. Good if apex can be sealed
Description : Faucet A basically used as inlet pipe and Faucet B is used as outlet pipe. Faucet A and B both are opened simultaneously, all the time. When Faucet A fills the tank and Faucet B empty the tank, it will take thrice the ... efficiency of Faucet A and Faucet B respectively? a) 1:2 b) 2:1 c) 1:3 d) 3:1
Last Answer : B Efficiency when both pipes used to fill = A + B And efficiency when Faucet A is used to fill and Faucet B is used to empty the tank = A-B So (A+B)/(A-B)=3/1 A/B+1/(A/B-1)=3/1 A/B+1=3(A/B-1) 3A/B-A/B=4 2A/B=4 A/B=2 Thus, the ratio of efficiency of Faucet A and B =2:1
Description : A single petrol tank supplies the petrol to the whole city, while the petrol tank is fed by a single pipeline filling the tank with the stream of uniform volume. When the petrol tank is full and if 20, ... petrol can be used daily without the supply every failing? a) 28000 b) 47000 c) 24000 d) 42000
Last Answer : A Let x litre be the per day filling and y litre be the capacity of the tank, then 45x + y = 20000 × 45 =900000…. (1) 30x + y = 16000 × 30 =480000…. (2) Solving eq. (1) and (2), we get 15x=420000 X=420000/15 x = 28000 Hence, 28000 litres per day can be used without the failure of supply
Description : Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is afunction of reaction temperature. In a chemical reaction, the time required to ... Then the order of this reaction is: (A) 0 (B) 1 (C) 2 (D) 3
Last Answer : (B) 1
Description : For the reversible reaction A ⇌ 2B, if the equilibrium constant K is 0.05 mole/litre; starting from initially 2 moles of A and zero moles of B, how many moles will be formed at equilibrium? (A) 0.253 (B) 0.338 (C) 0.152 (D) 0.637
Last Answer : (B) 0.338
Description : Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then 't' for a first order reaction is given by (A) k. t = ln a/(a - x) (B) k. t = x/a (a - x) (C) k. t = ln (a - x)/a (D) k. t = ln a (a - x)/x
Last Answer : (A) k. t = ln a/(a - x)
Description : Why does 10 gram nitrogen gas contain the same number of molecules as 10 gram of carbon monoxide?
Last Answer : What is the answer ?
Description : How does the water in the tank of a solar heater get heated?
Last Answer : The sun warms the water, which is normally in thin pipes. Thewarm water rises into a tank which is often at the top of theheater. Colder water is then forced down into the pipes where itgets warm in turn. So the water in the tank gets warmer andwarmer.
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 : The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On 1st July, 2006, it was found that only 0.
Last Answer : The radioactive isotope of cerium - 137 of weigh 8g was collected on 1st Feb. 2006 kept in a sealed tube. On ... days B. 30 days C. 25 days D. 50 days
Description : A tank internally measuring 150 cm × 120 cm × 100 cm has 1281600 cm^3 of water in it. Porous bricks are placed in the water until the tank -Maths 9th
Last Answer : Volume of a brick = 20 cm 6 cm 4 cm = 480 cm3. Water absorbed by one brick = (110 480)(110 480) cm3 = 48 cm3. Let x bricks be placed in the water. Then, x bricks absorb 48x cm3 of water. ... tank ⇒ 1281600 + 480xx - 48xx = 150 x 120 x 100 ⇒ 432xx = 1800000 - 1281600 = 518400 ⇒ xx = 1200.
Description : What part of a magnet would pick up most iron filling?
Last Answer : The one that the field strength is stronger
Description : Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis. (A) 500 (B) 750 (C) 950 (D) 1100
Last Answer : (B) 750
Description : In truss analysis, the reactions can be found by using the equation . a.R=KQ+F b.R=KQ-F c.R=K+QF d.R=K-QF
Last Answer : b.R=KQ-F
Description : A wealthy wise old woman feared that her daughter was lazy and as a result rather stupid. When the old woman died, her will stipulated that her assets were to be liquidated and a check was to be ... only one envelope had a true statement and that the other two statements were false. The en -Riddles
Last Answer : The daughter should pick envelope 1. Unfortunately she picked envelope 3. Statements 1 and 2 were false, and the only true statement was statement 3. If the check was in envelope 1, that would make statement 1 ... both be true. If the check was in envelope 3, statements 1 and 3 would both be true.
Description : If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is A. 50 mg/l B. 100 mg/l C. 150 mg/l D. 250 mg/l
Last Answer : ANS: D
Description : Which of the following statement(s) is/are true concerning the role of antibiotics in wound care? a. Systemic antibiotics are indicated for all open wounds b. Bacterial resistance can occur with ... of tissue on quantitative analysis d. Silver sulfadiazine is useful only for the management of burns
Last Answer : Answer: c The role of antibiotics in wound care is controversial. All open wounds are colonized with bacteria. Only when surrounding tissue is invaded (cellulitis) are systemic antibiotics clearly ... of relevant drug-resistant plasmids in bacteria, and its low cost make it a good choice
Description : How many calories does 1 gram of meat contain ?
Last Answer : 1 gram of meat contains 4 kilocalories.
Description : Which of the following may contain fimbriae? A- Gram-positive bacteria B- .Gram-negative bacteria C- Both (a) and (b) D- None of these
Last Answer : C. A and b
Description : If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated? (1) Increases (2) Decreases (3) Unchanged (4) Depends upon the metal
Last Answer : (1) Increases Explanation: When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter of the circular hole also increases. Using ... of expansions, we find that the hole radius increases at the same linear rate as the metal.
Last Answer : Increases
Description : Water (specific heat cv= 4.2 kJ/ kg ∙ K ) is being heated by a 1500 W h eater. What is the rate of change in temperature of 1kg of the water? A. 0.043 K/s B. 0.179 K/s C. 0.357 K/s D. 1.50 K/s Formula: Q = mcv ( T)
Last Answer : 0.179 K/s
Description : What amount of fats give energy of 9.3 K Calories? A. 2.0 gram B. 0.5 gram C. 1.0 gram D. 4.1 gram
Last Answer : ANSWER: C
Description : What amount of fats give energy of 9.3 K Calories? A. 0.5 gram B. 1.0 gram (Answer) C. 2.0 gram D. 4.1 gram
Last Answer : B. 1.0 gram (Answer)
Description : Maximum permissible residual chlorine in treated water should be __________ mg/litre. (A) 0.001 to 0.01 (B) 0.2 to 0.3 (C) 2 to 3 (D) 5 to 10
Last Answer : (B) 0.2 to 0.3
Description : Requirement of water for apron washing a. 5 litre per square metre per day b. 10 litre per square metre per day * c. 15 litre per square metre per day d. 20 litre per square metre per day
Last Answer : b. 10 litre per square metre per day *
Description : Requirement of water for platform washing is a)5 litre per square metre per day * b)10 litre per square meter per day c) 15 litre per square metre per day d)20 litre per square metre per day
Last Answer : a)5 litre per square metre per day *
Description : Two jars having a capacity of 3 and 5 litres respectively are filled with mixtures of milk and water. In the smaller jar 25% of the mixture is milk and in the larger 25% of the mixture is water. The jars are emptied ... the percentage of milk in the cask. a) 55% b) 50% c) 45% d) 25% e) None of these
Last Answer : Answer: D 0.75+3.75=4.5/10+8*100=4.5/18*100=25%
Description : The efficiency of sedimentation tank does not depend upon (A) Depth of tank (B) Length of tank (C) Detention period (D) Velocity of water
Last Answer : (D) Velocity of water
Description : Pick up the incorrect statement from the following: A. The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion B. Sludge digestion is carried ... contain 75% carbon dioxide D. The gases produced in sludge digestion process, contain 75% methane
Last Answer : ANS: C
Description : What is formed when white phosphorus is heated at 540 K in the absence of air? -Do You Know?
Last Answer : answer:
Description : When sulphur is heated at 800 K, the initial pressure of 1 atm decreases by `20%` at equilibrium `K_(p)` of the reaction `S_(8)(g)rArr4S_(2)(g)` is :-
Last Answer : When sulphur is heated at 800 K, the initial pressure of 1 atm decreases by `20%` at equilibrium `K_(p)` of the ... A. 0.2 B. 0.512 C. 1.51 D. 2
Description : When ethylhydrogen sulphate is heated with excess of alcohol at 410 K, the product obtained is
Last Answer : When ethylhydrogen sulphate is heated with excess of alcohol at 410 K, the product obtained is A. ... B. Ethylene C. Diethyl ether D. Diethyl sulphate
Description : What is formed when white phosphorus is heated at 540 K in the absence of air?
Last Answer : Red phosphorus
Description : Why is that on being heated in excess supply of air K,Rb and Cs forms superoxide’s instead of Oxides & peroxides?
Last Answer : Ans.K + ,Rb+ and Cs+ are large cations and superoxide ion is larger than oxide and peroxide ions. Since due to higher lattice energies,a large cation stabilizes a large anion,therefore these metals form Superoxides.