The following are some safety rules in a laboratory. Which one is not correct?

• Do not eat or drink in the laboratory

• Do not report any injury, however small, to the teacher

• Do not taste chemicals in the laboratory

• Do not run in the laboratory

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 the science teacher

Ali would like to heat a test-tube containing chemical X over a Bunsen burner. How should Ali carry put 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

When pouring concentrated acid from a reagent bottle into a test-tube, which of the following is the best method of holding the bottle?

• Holding the base of the bottle

• Holding the bottle where its label is

• Holding the bottle by its neck

• Holding the bottle with both hands

A student working in a laboratory accidentally spilled concentrated hydrochloric acid on his hand. The most practical thing to do is __________.

• To go to the hospital immediately

• To rub the hand with a wet towel

• To rub the hand with a dry towel

• To wash the hand quickly under running water

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

• Beaker

• Cup

• Gas jar

• Pipette

If the air holes of a Bunsen burner are fully opened the flame will be __________.

• Short, non-luminous and hot

• Long, sooty and non-luminous

• Short, luminous and hot

• Short, sooty and hot

Tags

NGSS.MS-PS3-5

Mohammad uses a Bunsen burner. He closes the air-hole. The flame of the burner will be __________.

• Colourless

• Blue

• Non-luminous

• Luminous

Which of the following is the correct statement related to the Bunsen flame shown in the figure?

• It is a non-luminous flame

• Its temperature is low

• It produces soot

• The air hole is closed

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

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

• Close the air hole -> Turn the gas tap on -> Light the burner

• Open the air hole -> Turn the gas tap on -> Light the burner

• Turn the gas tap on -> Light the burner -> Close the air hole

• Turn the gas tap on -> Open the air on -> Light the burner