Sec 1 Challenge 3

Table below shows the observations of various objects that are used to scratch against each other.

Which of the following statements best explains the observations above?

• Object A is stronger than object C and object C is stronger than object B.

• Object B is stronger than object C and object C is stronger than object A.

• Object A is harder than object C and object C is harder than object B.

• Object B is harder than object C and object C is harder than object A.

Which statement about the figures below is correct?

• W and Y are compounds while X and Z are elements.

• W is a compound; X and Z are elements while Y is a mixture.

• W and Z are compounds; X is an element while Y is a mixture.

• W is a compound; X is an element while Y and Z are mixtures.

Paint dissolves completely in turpentine, but not in water. Which statement is not true?

• Turpentine is the solvent that can dissolve paint.

• Stirring the paint in turpentine decreases the time taken for the paint to dissolve.

• No residue is seen after filtration when the paint is placed in turpentine.

• It shows that the type of solvent affects solubility of paint

Which organ performs filtration?

• skin

• kidney

• tongue

• stomach

Which of the following places where bacteria are found can be beneficial to human beings?

1 large intestine

2 mouth

3 waste treatment plants

• 3 only

• 1 and 2

• 1 and 3

• 2 and 3

The diagram shows two cells as seen using a microscope.

Which label is correct for both cells?

• cell sap

• chloroplast

• cytoplasm

• cell membrane

The cell below has a unique shape to support its function. The function is ________.

• to absorb water and mineral from soil

• to absorb sunlight

• to deliver impulse to the brain

• to carry more oxygen

In the figure below shows the onion cells under the microscope.

Which organelle is pointed by the arrow?

• cytoplasm

• chloroplast

• nucleus

• vacuole

A substance is heated from 25°C to 95°C. Its particles change from an orderly arrangement at 25°C to a disorderly arrangement at 95°C. Which of the following statements is correct?

• The substance exists as a gas at 25°C.

• The substance exists as a liquid at 95°C.

• The substance boils when the temperature increases from 25°C to 95°C.

• The substance changes from the gaseous state to the liquid state

The image formed on a plane mirror is _________.

• upright and virtual

• inverted and real

• darker than the object

• smaller than the object