CHAPTER 8 KSSM

What is the use of duralumin?

• Making of aircraft body frame

• Making of musical instruments

• Making of electrical connectors

• Making of surgical instruments

What is the main component of glass?

• Silica

• Silicon

• Kaolin

• Sodium carbonate

Which of the following is true about ceramic?

• Ceramic has low melting point

• Ceramic is soft and weak

• Ceramic is inert to chemicals

• Ceramic is poor insulator of electricity and heat

Why a boat which is made from fibre glass is better than steel?

• heavier

• more resilient and flexible

• lower tensile strength

• more soft and weak

Which of the following are the compositions of pewter?

• aluminium

• tin

• antimony

• copper

-Low melting point

-Cracks easily with sudden

-Easy to mould and shape

Which of the following types of glass shows the above properties?

• fused silica glass

• soda-lime glass

• borosilicate glass

• lead crystal glass

Which of the following composite materials match with its property?

• Reinforced concrete - Soft and weak

• Superconductor - Transparent and no reflect to light rays

• Photochromic glass - Insulator of electricity

• Fibre glass - High density and non-flexible

-Low material cost

-Transmit data using light waves in telecommunications

Which of the following has properties above?

• superconductor

• photochromic glass

• fibre optics

• fibre glass

Which of the following is TRUE about an alloy?

• An alloy is a pure metal which is weak and soft

• An alloy is a compound consisting of metal and non-metal

• An alloy is a long chain of molecules formed by monomers

• An alloy is a mixture of two or more elements with a certain fixed composition in which the major component is a metal

Which of the following are the purpose of making alloys?

• to prevent corrosion

• to increase the strength and hardness

• to improve the appearance

• to increase the density