Description : What is the average life of a radioactive atom having a 'half life period' of T? (A) 1.44 T (B) 0.144 T (C) 14.4 T (D) 2T
Last Answer : (A) 1.44 T
Description : A cyclist moves due east at 8 km/h for half an hour and then turns exactly south-wards for another half an hour at 6 km/h. The average velocity of the cyclist for the period is (a) 5 km/h (b) 7 km/h (c) 10 km/h (d) 14 km/h
Last Answer : Ans:(a)
Description : `C^(14)` has a half`-` life of 5760 years. `100mg` of the sample containing `.^(14)C` is reduced to `25mg` in a)11520years b)2880years c)1440years d)1
Last Answer : `C^(14)` has a half`-` life of 5760 years. `100mg` of the sample containing `.^(14)C` is ... 11520 years B. 2880 years C. 1440 years D. 17280 years
Description : Information about the order of reaction is obtained from its (a) Reaction rate (b) Molecularity (c) Rate equation (d) Half-life period
Last Answer : Ans:(c)
Description : Half life period of thorium 234?
Last Answer : 24 days
Description : If `3//4` quantity of a radioactive substance disintegrates in 2 hours, its half`-` life period will be a)`15 mi n` b) `30 mi n` c)`60 mi n` d)`90 mi
Last Answer : If `3//4` quantity of a radioactive substance disintegrates in 2 hours, its half`-` life period will be ... B. 45 minutes C. 30 minutes D. 15 minutes
Last Answer : If `3//4` quantity of a radioactive substance disintegrates in 2 hours, its half`-` life period will be a)`15 mi n ... mi n` c)`60 mi n` d)`90 mi n`
Description : If the relation between time of decay (t) and half life period `(t_(1//2))` is `(t = 4 t_(1//2))`, the relation between r and mean life (T) is:
Last Answer : If the relation between time of decay (t) and half life period `(t_(1//2))` is `(t = 4 t_(1//2))`, the ... `27^(4)` In 2 C. 4 T In 2 D. 2T In 2
Description : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : 1`. If the half-life period of `A` is
Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) ... B. 3 yrs C. 3.3 yrs D. None of these
Description : The half life period of uranium is 4.5 billion years. After 9.0 billion years, the number of moles of heliumm liberated from the following nuclear rea
Last Answer : The half life period of uranium is 4.5 billion years. After 9.0 billion years, the number of moles of heliumm ... 1.0 mol C. 11.2 mol D. 22.4 mol
Description : A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial activity is ten times the permissible val
Last Answer : A radioactive element gets spilled over the floor of a room. Its half life period is 30 days. If its initial ... B. 1000 days C. 300 days D. 10 days
Last Answer : At radioactive equilibrium, the ratio between two atoms of radioactive elements `A` and `B` is `3.1 xx 10^(9) : ... . 4.65 yrs C. 5.46 yrs D. 5.64 yrs
Description : If half life period of radium is 1600 years, its average life period will be:
Last Answer : If half life period of radium is 1600 years, its average life period will be: A. 2304 years B. 4608 years C. 230.4 years D. 23040 years
Last Answer : If `3//4` quantity of a radioactive substance disintegrates in 2 hours, its half`-` life period will be ... B. 30 minutes C. 60 minutes D. 90 minutes
Description : Time required for the organism to eliminate 50% the total body burden or tissue concentration of chemical is referred as – (1) Threshold limit time (2) Halftime life (3) Residual-period (4) Half-life period
Last Answer : (4) Half-life period Explanation: Time required for the organism to eliminate 50 per cent of the total body burden or tissue concentration of chemical is referred to as Half Life Period.
Description : 75% of a radioactive element decays in 6 hours. Its half life period is __________ hours. (A) 3/4 (B) 1/6 (C) 3 (D) 4
Last Answer : (C) 3
Description : Pick out the wrong statement. (A) α-particle emission from a radioactive element makes it electrically negative (B) β-particle emission from a radioactive element makes it electrically ... ) The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration
Last Answer : (C) A radioactive element having a half life period of 20 years will completely disintegrated in 40 years
Description : The half life period of a radioactive element depends on its (A) Temperature (B) Pressure (C) Amount (D) None of these
Last Answer : (D) None of these
Description : . The half life period of a radioactive element depends upon the (A) Temperature (B) Pressure (C) Amount of element present (D) None of these
Description : The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to __________ gm. (A) 1/4 (B) 1/8 (C) 1/2 (D) 1/16
Last Answer : (D) 1/16
Description : If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be __________ days. (A) 5 (B) 10 (C) 20 (D) 30
Last Answer : (B) 10
Description : The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a GeigerMuller counter from its known quantity. If the half life period of a ... in four months (D) 1/8th of it will remain intact at the end of four months
Last Answer : (B) It will completely disintegrate in two months
Description : The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years. (A) 24 (B) 18 (C) 6 (D) 36
Last Answer : (B) 18
Description : For a zero order chemical reaction, the (A) Half life period is directly proportion to the initial concentration of the reactants (B) Plot of products concentration with time is a straight line through the origin (C) Products concentration increases linearly with time (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Half-life period for a first order reaction is __________ the initial concentration of the reactant. (A) Directly proportional to (B) Inversely proportional to (C) Independent of (D) None of these
Last Answer : (C) Independent of
Description : The half life period of a first order reaction is given by (where, K = rate constant.) (A) 1.5 K (B) 2.5 K (C) 0.693/K (D) 6.93 K
Last Answer : (C) 0.693/K
Description : Half life period of a chemical reaction is (A) The time required to reduce the concentration of the reacting substance to half its initial value (B) Half of the space time of a reaction (C) Half of the residence time of a reaction (D) None of these
Last Answer : (A) The time required to reduce the concentration of the reacting substance to half its initial value
Description : A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16
Last Answer : (D) 16
Description : For a __________ order chemical reaction as shown in the bellow figure, the half life period is independent of the initial concentration of the reactant A. (A) Zero (B) First (C) Second (D) Third
Last Answer : (B) First
Description : Half life period of a chemical reaction is proportional to CA0 -1 , if the reaction is of __________ order. (A) First (B) Zero (C) Second (D) Third
Last Answer : (C) Second
Description : Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes. (A) 18 (B) 24 (C) 6 (D) 12
Last Answer : (B) 24
Description : Half life period of a first order irreversible reaction A → B is (A) k/2 (B) ln k/2 (C) ln 2/k (D) ln 0.5/k
Last Answer : (C) ln 2/k
Description : If a drug is eliminated by first order kinetics: A. A constant amount of the drug will be eliminated per unit time B. Its clearance value will remain constant C. Its elimination half life will increase with dose D. It will be completely eliminated from the body in 2 × half life period
Last Answer : B. Its clearance value will remain constant
Description : 1. Who has the final power to maintain order within the House of People ? 2. X210 has half life of 5 day. What is the time taken for seven-eights of sample of X210 to decay? 3. What is ... an important condition for growth of coral? 20. Where was the Arya Samaj setup for the first time in 1875 ?
Last Answer : Answer : 1. Speaker 2. 15 days 3. A drilling ship in Bombay High 4. U.S.A. 5. Cotton textiles 6. Bachendri Pal 7. Nodulated root 8. President 9. Chile 10. Nur Jahan 11. 5 12. ... coast 15. Dayanand Saraswati 16. Chloramphenical 17. Lord Ripon 18. Helium nuclear 19. Wave-free salt water 20. Bombay
Description : Time required for the organism to eliminate 50% the total body burden or tissue concentration of chemical is referred as (1) Threshold limit time (2) Half-time life (3) Residual period (4) Half-life period
Last Answer : Half-life period
Description : What is the half-life of carbon 12 isotope ?
Last Answer : Carbon -12 is a normal atom. It is not radioactive. C- 14 is radioactive. Its half -life is 5,630 years
Description : Carbon l4 with a half life of 5,568 years is used to date a sample of wood. The sample has l/8 the carbon l4 contained in a living tree of the same species. Approximately how old is the specimen?
Last Answer : ANSWER: l6,704 YEARS
Description : When Grant was 8, his brother was half his age. Now, Grant is 14. How old is his brother? -Riddles
Last Answer : His brother is 10. Half of 8 is 4, so Grant’s brother is 4 years younger. This means when Grant is 14, his brother is still 4 years younger, so he’s 10.
Description : When Grant was 8, his brother was half his age. Now, Grant is 14. How old is his brother -Riddles
Description : A freshly cut tree and a wooden artifact have 30.4 and 15.2 conuts `g^(-1)` `"min"^(-1)` of `C^(14)` of half of 5700 years. The age of the artifact in
Last Answer : A freshly cut tree and a wooden artifact have 30.4 and 15.2 conuts `g^(-1)` `"min"^(-1)` of `C^( ... in years would be: A. 2850 B. 5700 C. 570 D. 6930
Description : What is one half of 14.5?
Last Answer : 7.25
Description : What is a half of 14.5?
Last Answer : Need answer
Description : What is half of 14.7?
Description : i have a 14 year old i adopted.He thinks it is normal to lie cheat and steal.He dose not like to do chores.He refuses to follow our rules.If told to do a chore it is done half way.what can we do to help him?
Last Answer : You have to realize that this is typical behavior for most teenagers. Be patient and loving encourage him when he is attempting to do chores, give credit for what work is done. Keep expectations. ... your handwriting change your life you can give it to him your child will change with ion amonth
Description : Which one of the following statements is correct? [NDA 2003] (a) India ranks 9th in the world's shipping tonnage (b) Mumbai port handles half of the country's foreign trade (c) Kandla and Kolkata are tidal ports (d) India has 14 major ports and 129 minor ports
Last Answer : Ans: (b)
Description : The average age of the students in a class is 14. The average age of half of the students in that class and the class teacher is 16. The average age of the remaining half of the students is 15. What is the number of students in that class? a) 20 b) 70 c) 80 d) Cannot be determined e) None of these
Last Answer : Because total no. of students is not known we cannot find the answer. Answer: d)
Description : 6 male , 8 female and 12 children can complete a work in 14 days .a female does twice the work of a male does and a child does half the work a male does . how many female alone can complete this work in 14 days? a) 15 b) 10 c) 12 d) 14
Last Answer : D Let 1 female ‘s 1 day work= x Then 1 male’s 1 day work =x/2 And 1 child’s 1 day work =x/4 So 6x/2 + 8x +12x/4 =1/14 3x+8x+3x = 1/14 14x = 1/14 X=196 1 female alone can complete the work in 196 days So, to complete the work in 14 days number of female required = 14.
Description : X does half as much work as Yand Z does half as much work as X and Y together. If Z alone can finish the work in 120 days, then together ,all will finish the work in ? a) 14 1/2 b) 40 c) 24 1/2 d)17 1/3
Last Answer : B Z alone can finish the work in 120 days. As given Z does half as much work as X and Y together => (X + Y) can do it in 60 days (X+ Y)s 1 days wok = 1/60. X's 1 days work : Y's 1 days Work = 1 ... (1/90) + (1/120) =(2+4+3)/360 =9/360 = 1/40 All the three together will finish it in 40 days
Description : Faucet A and B can fill a tank in 15 and 9 hrs respectively. Faucet C can empty it in 45 h. The tank is half full. All the three faucets are in operation simultaneously. After how much time the tank will be full ? A) 1(7/15)hrs B) 2(1/11)hrs C) 3(3/14)hrs D) 3(3/11)hrs
Last Answer : C In 1 hr = 1/15+1/9 – 1/45 =>3+5-1/45 = 7/45 ½ tank filled by 3 Faucets = 45/7*1/2 => 45/14 =>3(3/14)