What is the device used to measure the force?

• Weighing scale

• Lever balance

• Spring balance

• Ruler

What is the force that exists when an object is stretched or compressed?

• Elastic force

• Weight

• Normal force

• Frictional force

The diagram shows a piece of free floating log which is partially immersed in water. Which of the following statement is true?

• Density of the log < Density of the water

• Density of the log > Density of the water

• Weight > Buoyant force

• Weight > Normal force

Which of the following is not a first-class lever?

• Plier

• Ice tong

• Bottle opener

• Scissors

Diagram shows the position of four cubes, K, L, M and N in a tank of water. Which of the following shows the arrangement of density of the cubes, from the densest to the least dense?

• K, M, N, L

• M, L, K, N

• K, L, M, N

• L, N, M, K

Which factor does affect the gas pressure?

• Temperature

• Surface area

• Weight

• Mass

Diagram shows two wooden blocks J (rough surface) and K (smooth surface). Which of the following shows the correct reading on the balance spring for the block below?

• J : 10 N K : 30 N

• J : 20 N K : 20 N

• J : 15 N K : 25 N

• J : 25 N K : 15 N

Why the wall of the dam is thicker at the base?

• The volume of water at the base is bigger

• The weight of water at the base is bigger

• The pressure at base is bigger

• The shape will make the dam more stable

Diagram shows a wooden block. Calculate the pressure acting on the floor.

• 20 Pa

• 50 Pa

• 150 Pa

• 200 Pa

An iron cube was inserted into a beaker containing water. It is found that the cube sinks to the bottom of the beaker. Which of the following statements are true about the cube?

I. Iron cube is denser than water

II. Buoyant force is larger than the weight of iron cube

III. The weight of iron cube is larger than buoyant force

• I only

• II and II only

• I and III only

• I, II, and III