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Measurement of Transpiration by Indirect Evaporation.

Which of the ...

Question

Which of the following set of materials is required to set up an experiment to determine the percentage of water absorbed by raisins ?

(1) raisins, breaker of water, filter paper, petri dish, weight box, balance
(2) raisins, petri dish, beaker, filter paper, weight box, balance
(3) raisins, beaker of water, blotting paper, physical balance, weight box
(4) raisins, beaker, blotting paper, petri dish, weight box, balance

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Solution

The following set of materials is required to set up an experiment to determine the percentage of water absorbed by raisins - raisins, beaker of water, blotting paper, physical balance, weight box.

Hence, the correct answer is option 3.

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Q. The following data was obtained on performing an experiment for determining the percentage of water absorbed by raisins:

Mass of water in the beaker	=	50 g
Mass of dry raisins	=	20 g
Mass of raisins after soaking in water	=	30 g
Mass of water left in the beaker after the experiment	=	40 g

The percentage of water absorbed by raisins will be:

(1) 10%
(2) 25%
(3) 45%
(4) 50%

Q. A group of students performed an experiment to determine the percentage of water absorbed by raisins.The initial weight of raisins is 5 grams and final weight is 8 grams. The percentage of water absorbed will be :

(1) 62.5

(2) 160

(3) 60

(4) 20

Q. A student soaked 5 g of raisins in beaker (A) containing 25 mL of ice-chilled water and another 5 g of raisins in beaker (B) containing 25 mL of tap water at room temperature. After one hour the student observed that:
(1) water absorbed by raisins in beaker (A) was more than that absorbed by raisins of beaker (B).
(2) water absorbed by raisins in beaker (B) was more than that absorbed by raisins of beaker (A).
(3) the amount of water absorbed by the raisins of both beakers (A) and (B) was equal.
(4) no water was absorbed by raisins in either of the beakers (A) and (B).

While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements:

Mass of water in the beaker = 40 g

Mass of raisins before soaking = 5 g

Mass of raisins after soaking for 2 hours = 8 g

Mass of water left in the beaker after the experiment = 35 g

The percentage of water absorbed by raisins is:

Q. Each of the three beakers A, B and C contained 50 mL of distilled water. A student placed five raisins in each beaker. The raisins for each beaker weighed the same. The beakers were kept at room temperature. The raisins were removed from beaker A after 10 minutes, from beaker B after 20 minutes and from beaker C after one hour. On calculating the percentage of water absorbed by the raisins, it was found that:
(1) maximum absorption of water by raisins was in beaker C
(2) maximum absorption of water by raisins was in beaker B
(3) minimum absorption of water by raisins was in beaker C
(4) absorption of water was equal in raisins of all the three beakers

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Measurement of Transpiration by Indirect Evaporation.

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