Multiple Choice QuestionsThe steps involved in observing a slide under a microscope are given
below. They are not in proper sequence.
I. Focus the object under high power of the microscope.
II. Place the slide on the stage of the microscope.
III. Arrange the mirror to reflect maximum light to the slide.
IV. Focus the object under low power of the microscope.
The proper sequence of steps is
II, III, IV, I
I, II, III, IV
IV, III, II, I
IV, III, II, I
The given figure illustrates binary fission in Amoeba in an improper order.
The correct order is
III, IV, II, I
IV, III, II, I
II, III, IV, I
II, III, IV, I
During the course of an experiment, 'to determine the percentage of water absorbed by raisins', raisins are weighed
every half an hour.
every hour.
once - only after completing the experiment.
once - only after completing the experiment.
The colour of raisins as used in the experiment, 'to determine the percentage of water absorbed by raisins' was
white
yellow
dark brown
dark brown
Following are the steps involved in the experiment 'to determine the percentage of water absorbed by raisins'. They are not in proper sequence.
I. Soak the raisins in fresh water.
II. Weigh dry raisins.
III. Weigh soaked raisins.
IV. Wipe out soaked raisins.
The correct sequence of steps is
I, II, III, IV
II, I, IV, III
II, I, III, IV
II, I, III, IV
Short Answer TypeHow does the valency of elements vary (i) in going down a group, and (ii) in going from left to right in a period of the periodic table ?
In the modern periodic table, the element calcium (atomic number = 20) is surrounded by elements with atomic number 12,19,21 and 38. Which of these elements has physical and chemical properties resembling those of calcium and why?
Write chemical equations for what happen when
i) sodium metal is added to ethanoic acid.
ii) sodium carbonate is added to ethanoic acid
iii) ethanoic acid reacts with a dilute solution of sodium hydroxide.
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