Explanation text : Planes

Soal Latihan Ujian Nasional Beserta jawaban:

All planes need air to pressure under their wings to stay up in the air. As they move forward. The higher air pressure underneath their wings pushes them upward and gives them lift.

The smooth, streamlined shape of the plane allows the air to flows easily over its surface. This helps to reduce the drag caused by the air pushing against the plane and allows it to move rapidly through the air.

Planes move forward using engines. This movement is called thrust. Moving forward keeps a stream of moving air passing over the wings. If the engines fail, theplanes will begin to descend very quickly.

The air above the wing moves faster, so it is at a lower pressure than the air under the wing.
The air under the wing moves more slowly and is slightly squashed, so it is at a higher pressure than the air above the wing.

1.      What does the text describe?

A.  how the wings of a plane work                                         D. how the plane move forward

B.   how the plane is made                                                      E. the engine of a plane

C.   how a plane flies

2.      “This helps to reduce the drag caused by the air pushing against the plane and allow it to move more rapidly through the air”(Paragraph 2) the underlined word can be replaced by....
A. slowly                   B. quickly                    C smoothly                  D. gradualy           E. immediately

3.      Movement planes forward using engines is called....
A. trust                      B. thurst                       C. Squash                    D. thrust               E. streaming

4.      “.....the planes will begin to descend very quickly” underlined word means..
A. go over                 B. go up                       C. landing                    D. starting            E. ending

5.      Which statement is false accroding the text..
A. all planes need air to presure under their wings to stay up in the air

B.   streamlined shape of the plane allows the air to flows easily over its surface

C.    planes move forward using engines

D.   moving forward keeps a stream of moving air passing over the wings

E.   planes movement forward is calling as streamlined.

         6.      The air under the wing moves more slowly and is slightly squashed, so...

A.it is at a lower pressure than the air under the wing.                      

B. it is at a higher pressure than the air above the wing.

C. allows the air to flows easily over its surface

D.a stream of moving air passes over their wings

E. the wings move forward

 

Explanation text: the sense of taste

Soal Latihan Ujian Nasional Beserta jawaban:

The sense of taste is one of a person's five senses. We taste with the help of taste-buds in the tongue.

There are four main kinds of taste: sweet, sour, salty, and bitter. All other tastes are just mixtures of two or more of these main types.

The surface of the tongue has more than fifteen thousand taste-buds (or cells). These are connected to the brain by special nerves which send the so-called 'tastes messages.

When the tongue comes into contact with food of any kind, the taste-buds will pick up the taste. The nerves then send a message to the brain. This will make us aware of the taste. All this happens in just a few seconds.

There are four kinds of taste-buds, each of which is sensitive to only a particular taste. These four groups are located in different parts of the tongue.

The taste-buds for salty and sweet tastes are found round the tip of the tongue and along its sides. Sour tastes can be picked up only at the sides of the tongue. The taste-buds of the bitter taste are found at the innermost edge of the tongue. There are taste-buds at the centre of the tongue.

The senses of smell and sight can affect taste. The good smell of food increases its taste. Similarly, attractive colours can make food appear tastier and more delicious. If food does not smell good or is dull-coloured, it will look tasty and may not taste good at all.

Very hot or cold sensations can make the taste-buds insensitive. Food that is too hot or too cold, when placed in the mouth, will have no tastes at all.

1.      We can taste any kind of food because of ....

A.  the good smell of food                                                     D. the four main kinds of taste

B.   the taste-buds in the tongue                                                          E. the senses of smell and sight

C.   the taste-buds round the tip of the tongue

2.      When we eat very hot or cold food ....

A.  the food will lose its taste                                                 D. the food won't smell good

B.   the taste of the food increases                                          E. the taste-buds will be sensitive

C.   the taste-buds will be very, responsive

3.      The senses of smell and sight ....

A.  increase the taste of the food                                            D. affect the taste of the food

B.   make food more delicious                                                 E. make the food look good

C. make the food attractive