Science Quiz Round !

What describes the upper cuticle of a leaf?

• A a single layer of cells containing many chloroplasts

• B a single layer of transparent cells allowing light to enter the leaf

• C a thin non-cellular layer preventing water loss from the leaf

• D a permeable layer allowing water to enter the leaf

During a sunny day, which substance is excreted from a leaf?

• A carbon dioxide

• B nitrogen

• C oxygen

• D sucrose

The coronary arteries carry blood to the

• A brain tissue.

• B heart muscle.

• C liver cells.

• D walls of alveoli

How do plants absorb nitrate ions by active transport?

• A against a concentration gradient using energy

• B against a concentration gradient without using energy

• C down a concentration gradient using energy

• D down a concentration gradient without using energy

A lorry takes 15 minutes to travel along the path PQRS.

What is the average speed of the lorry?

• A 4.0km/ h

• B 22km/ h

• C 48km/ h

• D 64km/ h

A student walks at a constant speed. He takes 100 s to walk 160 paces. The length of each pace is 0.80 m. How far does the student walk in 50s?

• A 64m

• B 80m

• C 128m

• D 256m

An object moves from P to Q in 10s with uniform acceleration. velocity at P = 5 m/ s velocity at Q = 12 m/ s

What is the acceleration?

• A 0.5m/ s2

• B 0.7 m/ s2

• C 1.2 m/ s2

• D 1.7m/ s2

Which vehicle has an acceleration of 5m/ s 2 ?

• A a bicycle, when its speed changes from rest to 2.5m/ s in 2s

• B a car, when its speed changes from rest to 15m/ s in 5s

• C a lorry, when its speed changes from rest to 20m/ s in 15 s

• D a motorbike, when its speed changes from rest to 50m/ s in 10 s

A man pulls a sledge of mass 25kg across level ground with a horizontal force of 60N. A constant force of friction of 20N acts on the sledge. What is the acceleration of the sledge?

• A 0.63m/ s 2

• B 1.6m/ s 2

• C 2.4 m/ s 2

• D 3.2 m/ s 2

A metal ball of mass 0.30kg and weight 3.0N is held so that it is below the surface of oil. It experiences an upwards force of 0.30N.

When the ball is released, what is its initial acceleration?

ANSWER=B

• A 1.0m/ s 2

• B 9.0 m/ s 2

• C 10m/ s 2

• D 11m/ s2