Question

electric switch
1
Which of these can you do without adult supervision?
a) cut vegetables
b) set off firecrackers
alread a book
d) swim
2. Which of these is dangerous to touch with wet hands?
a) ladder
b) mop
d) matchbo
3. While on the road you should not
a) walk on the footpath
b) follow the traffic lights
un across the road
d) cross the road at a zebra cro
4. If someone is injured or sick, you should
a) call a doctor b) comfort them c)
5. In which of these situations will you help on your own?
a) a deep cut bya nosebleed c) a serious burn d) all of
avoid crowding dan
of t
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Answer 1

Answer:

Stuff a large handkerchief or some crumpled

newspaper into an empty glass or jar. Make sure

the handkerchief won’t fall out when you turn the

glass upside down.

Then, fill a pot with water. Holding the glass so

that its mouth is down, put the glass deep into the

pot of water and hold it there. After a minute or

two, pull the glass out of the water and remove the

handkerchief.

You will see that: The handkerchief is dry.

Explanation: Water cannot fill the glass because

the glass is already ~lled with air. The “empty”

glass is full of air. So, air takes up space.

Air is a gas. It has no size or shape of its own but

will fill every space it can.

Place a funnel in the neck of an empty soda bottle.

Pack clay around the neck of the bottle so that there is

no space between the bottle and the funnel.

Pour water into the funnel. Notice what happens.

Then take the clay off the bottle and funnel.

You will see that: While the clay is there, the water

remains in the funnel or enters the bottle only in slow

spurts. When the clay is removed, the water flows

freely into the bottle.

Explanation: The clay seals the neck of the bottle

outside of the funnel. When water flows into the

funnel, the air cannot escape except by going through

the water very slowly. The air in the bottle takes up

space and prevents the water from coming in. When

the clay is removed and air is able to leave around the

neck of the bottle, then water can flow in. This proves

Answer 2

Answer:

which of these can you do without adult supervision