HARD
9th CBSE
IMPORTANT
Earn 100
The correct procedure for preparing a colloidal solution of egg albumin in water is:
75% studentsanswered this correctly
Important Questions on Multiple Choice Questions (MCQs) (Based on Practical Skills in Science)
HARD
9th CBSE
IMPORTANT
Four students (A), (B), (C) and (D) independently observed the evaporation of water under different conditions and recorded the temperature of water at regular intervals as shown below.
| Student | Placing of experimental set up in/under | Temperature recording for minutes |
| A | sun | increased gradually |
| B | open air | decreased gradually |
| C | a fan | initially increased, then became constant |
| D | a corner of the room | initially increased, then gradually decreased |
MEDIUM
9th CBSE
IMPORTANT
A student takes a mixture of sand and ammonium chloride in a china dish and heats it under a funnel fitted with a plug over a flame. He would observe that :
HARD
9th CBSE
IMPORTANT
A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking its temperature readings. He would observe that the temperature of water:
HARD
9th CBSE
IMPORTANT
Which of the following is the correct set of apparatus to separate common salt and sand by filtration process:
MEDIUM
9th CBSE
IMPORTANT
A student added the following substances to water kept in four separate beakers. He stirred the mixture well and filtered each one of them through a filter paper. He would obtain a solid residue on the filter paper in the case of:
HARD
9th CBSE
IMPORTANT
In an experiment, carbon disulphide was added to a test-tube containing a mixture of iron filings and sulphur powder as shown in the given diagrams:
The correct observation is represented in diagram:
MEDIUM
9th CBSE
IMPORTANT
The colour of insoluble product formed when sodium sulphate solution and barium chloride solution are mixed together is:
HARD
9th CBSE
IMPORTANT
A student, by mistake, mixed sulphur powder with iron filings. The following techniques were suggested to separate the sulphur from the mixture out of which he has to choose one:
A. dissolving in carbon disulphide, filtration, evaporation
B. dissolving in water at room temperature and filtration
C. dissolving in hot water, filtration and evaporation
D. dissolving in ice cold water and filtration
The correct technique is:
