UPTET · Mathematics and Science (Paper II)
States of matter, mixtures, separation, acids/bases/salts and chemical changes.
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Q1 · Matter and Materials · EASY
A student observes that when sugar is added to water and stirred, it disappears and forms a clear solution. What type of mixture is this?
Q2 · Matter and Materials · MEDIUM
Which of the following methods would be most suitable to separate a mixture of sand and common salt?
Q3 · Matter and Materials · EASY
A teacher adds a few drops of phenolphthalein indicator to a solution and it turns pink. What can be concluded about the solution?
Q4 · Matter and Materials · MEDIUM
When iron filings are heated with sulphur powder, a new substance is formed that cannot be separated by physical methods. This is an example of:
Q5 · Matter and Materials · HARD
A teacher performs an experiment where she takes 50 mL of water at 25°C and adds common salt to it until no more salt dissolves. She then heats the solution to 50°C and adds more salt. She observes that additional salt dissolves. Which scientific concept does this experiment best demonstrate?