Question
In a certain laboratory, scientists grow bacteria for research purposes. During a certain experiment, they rear bacteria in culture in a Petri dish. A particular strain of bacteria doubles in every 30 minutes. The scientists start with a single cell.
(1) How many bacteria will be there in the Petri dish after 12 hours?
(a) $2^{12}$$\quad$(b) $2^{18}$$\quad$(c) $2^{20}$$\quad$(d) $2^{24}$
(2) How many bacteria will be there in the Petri dish after 24 hours?
(a) $2^{24}$$\quad$(b) $2^{36}$$\quad$(c) $2^{40}$$\quad$(d) $2^{48}$
(3) If the Petri dish was full with bacteria after 24 hours, when was it half full?
(a) After 12 hours$\quad$(b) After 18 hours$\quad$(c) After 23 hours$\quad$(d) After 23 hours 30 minutes
(4) Had the scientists started with 1 cell each in two similar Petri dishes, how many bacteria would have been there in all after 12 hours?
(a) $2^{24}$$\quad$(b) $2^{25}$$\quad$(c) $2^{36}$$\quad$(d) $2^{48}$
(5) Had the scientists started with 2 cells in a Petri dish, how much time would they have saved in having a Petri dish full of bacteria?
(a) 30 minutes$\quad$(b) 1 hour$\quad$(c) 6 hours$\quad$(d) 12 hours
(1) How many bacteria will be there in the Petri dish after 12 hours?
(a) $2^{12}$$\quad$(b) $2^{18}$$\quad$(c) $2^{20}$$\quad$(d) $2^{24}$
(2) How many bacteria will be there in the Petri dish after 24 hours?
(a) $2^{24}$$\quad$(b) $2^{36}$$\quad$(c) $2^{40}$$\quad$(d) $2^{48}$
(3) If the Petri dish was full with bacteria after 24 hours, when was it half full?
(a) After 12 hours$\quad$(b) After 18 hours$\quad$(c) After 23 hours$\quad$(d) After 23 hours 30 minutes
(4) Had the scientists started with 1 cell each in two similar Petri dishes, how many bacteria would have been there in all after 12 hours?
(a) $2^{24}$$\quad$(b) $2^{25}$$\quad$(c) $2^{36}$$\quad$(d) $2^{48}$
(5) Had the scientists started with 2 cells in a Petri dish, how much time would they have saved in having a Petri dish full of bacteria?
(a) 30 minutes$\quad$(b) 1 hour$\quad$(c) 6 hours$\quad$(d) 12 hours
