I.S homework 1

1. Which of the following statements about the two types of light-sensitive cells is correct?
A. There are three types of cones that are sensitive to red, yellow and blue lights respectively.
B. Most rods are situated at the blind spot.
C. Brain integrates the messages from various cones to produce coloured images.
D. Rods only work well in bright light conditions.


2. It is dangerous for people to drive after drinking alcohol because it
(1) slows down our responses.
(2) affects our judgement.
(3) increases our urine (尿液) output.

A. (2) and (3) only
B. (1) and (3) only
C. (1), (2) and (3)
D. (1) and (2) only


3. In a noisy place, we should
(1) wear a helmet.
(2) wear earmuffs.
(3) avoid staying for a long time.
A. (2) and (3) only
B. (1) and (3) only
C. (1), (2) and (3)
D. (1) only


4. What is the energy change at the ear drum?

A. Sound energy to kinetic energy
B. Sound energy to sound energy
C. Sound energy to potential energy
D. Sound energy to electrical energy


5. Which structure of the eyeball is related to the formation of cataract?

A. Lens
B. Iris
C. Pupil
D. Optic nerve


6. If the light rays of an object fall on the blind spot,

A. the person will see the object black.
B. the person will see the object inverted.
C. the person will not see the object.
D. the person will see the object sharply.


7. An antacid contains

A. a weak acid.
B. a strong acid.
C. a strong alkali.
D. a weak alkali.