Introducing Science

Which of the following is the correct laboratory rule?

• Eating in the laboratory while doing practical during lunch time.

• Running in the laboratory when he is in a hurry.

• Poking the electrical power points with sharp objects.

• Using the apparatus in the laboratory only when told to do so by your teacher.

Amir would like to heat a test tube containing chemical X over a Bunsen burner. How should Amir carry out the heating?

• Holding the test tube with his bare hands.

• Holding the test tube with a piece of cloth.

• Holding the test tube using a test tube holder.

• Holding the test tube with tongs.

Which of the following apparatus is the best one to use for measuring a fixed volume of liquid accurately?

• Beaker

• Cup

• Gas jar

• Measuring cylinder

Which of the following characteristics of a non-luminous flame?

• It is blue and very hot.

• It is easy to see.

• It is sooty.

• It is yellow and easy to see.

Which of the following is the proper technique of lighting a Bunsen burner?

• Close the air hole, open the air hole, light a match

• Open the air hole, turn the gas tap on, light a match

• Turn the gas tap on, light a match, close the air hole

• Close the air hole, light a match, turn the gas tap on

The formula to find the volume of irregular-shaped object is

• V₁ + V₂

• V₁ - V₂

• V₂ - V₁

• V₁ x V₂

An object sinks in the water. It follows that the density of the object

• Is more than that of water.

• Is less than that of water.

• Is equal to that of water.

• Is not possible to determine.

A piece of metal cube weighs 24g and its volume is 50cm³. Find the density of the metal.

• 0.48 g/cm³

• 9.0 g/cm³

• 400 g/cm³

• 500 g/cm³

What will happen to an object (density = 0.28 g/cm³) if placed in a beaker of water?

• It will sink.

• It will float.

• It will stays in the middle of the water.

• It will be at the bottom of the beaker.

The first step for a scientist to conduct a scientific investigation is

• To formulate a hypothesis

• To plan an experiment

• To ask questions

• To process the data from the experiment