Listening (watching)

1.Which of the following statements are true or false? If the statement is wrong, correct it:

1. Pictures are sent through the air.

2. A camera lens focuses a picture on a light-sensitive plate of rubber.

3. The plate of glass throws off protons.

4. In the bright areas of the pictures plate throws off few electrons.

5. At the receiving end impulses are picked up by an amplifier.

2. Complete the sentences with a word or phrase.

a) Television really means seeing at …

b) The electrons are collected on …

c) A scanning beam sweeps back and forth in lines across …

d) At the receiving end the impulses are sent to …

e) A screen also has winds and have been scanned every other line …

3. Choose the best answer to the questions:

1. What is transmitted through the air?

a) electrical charges b) electrical light c) electrical impulses

2. What is changed or modulated according to whether it strikes bright or dark area?

a) a picture b) the beam c) the image

3. What does plate throw off in the dark areas of the pictures?

a) few electrons b) few pictures c) few impulses

4. Where are impulses picked up by an antenna?

a) at the target plate b) at the amplifier c) at the receiving end

5. What does cover the entire surface 30 times in one second?

a) a screen b) a scanning beam c) a plate

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Listening (watching)

1.Which of the following statements are true or false? If the statement is wrong, correct it:

1. Pictures are sent through the air.

2. A camera lens focuses a picture on a light-sensitive plate of rubber.

3. The plate of glass throws off protons.

4. In the bright areas of the pictures plate throws off few electrons.

5. At the receiving end impulses are picked up by an amplifier.

2. Complete the sentences with a word or phrase.

a) Television really means seeing at …

b) The electrons are collected on …

c) A scanning beam sweeps back and forth in lines across …

d) At the receiving end the impulses are sent to …

e) A screen also has winds and have been scanned every other line …

3. Choose the best answer to the questions:

1. What is transmitted through the air?

a) electrical charges b) electrical light c) electrical impulses

2. What is changed or modulated according to whether it strikes bright or dark area?

a) a picture b) the beam c) the image

3. What does plate throw off in the dark areas of the pictures?

a) few electrons b) few pictures c) few impulses

4. Where are impulses picked up by an antenna?

a) at the target plate b) at the amplifier c) at the receiving end

5. What does cover the entire surface 30 times in one second?

a) a screen b) a scanning beam c) a plate