MC - Ch15.1 (TS) Eyes

Ch15.1/Detecting the environment/Eyes/P.
1
Ch.15 Detecting the environment
15.1 Eyes
1. 1990 Q.50 (A)
The drawing below shows a light ray diagram of a human eye with a defect. lenses I and II can be used to correct
certain eye defects.
Which of the following describes the above eye defect and the appropriate lens to be used for its correction?
eye defect lens to be used for correction
A. long sight lens I
B. long sight lens II
C. short sight lens I
D. short sight lens II
Directions: Questions 2 and 3 refer to the graph below which shows the changes of the lens thickness of a boy’s eye
within a period of time:
lens thickness
(arbitrary unit)
0 2 4 6 8 10
Time
2. 1991 Q.44 (D)
What is happening to the boy’s eye between the 2 nd and 4th second ?
A. The pupil is dilating.
B. The ciliary muscles are relaxing.
C. The suspensory ligaments are contracting.
D. The tension on the suspensory ligaments is decreasing.
3. 1991 Q.45 (D)

Between the 6th and the 8th second, the boy is looking at
A. a nearby stationary object.
B. a far away stationary object.
C. an object moving towards him.
D. an object moving away from him.
4. 1993 Q.31 (C)

Which of the following statements about short sight is/are correct?
(1) The curvature of the lens is too great.
(2) Images of distant object are formed in front of the retina.
(3) A convex lens is used for correction.
A. (1) only
B. (3) only
C. (1) and (2) only
D. (2) and (3) only
Ch15.1/Detecting the environment/Eyes/P.2
Directions: Questions 5 and 6 refer to the diagram below which shows the path of light rays from a distant object to a
defective eye through a corrective lens:
5. 1994 Q.27 (A)

What is the likely cause of this eye defect?
A. The eyeball is too long.
B. The lens is too thin.
C. The cornea is not smooth.
D. The lens is nor elastic.
6. 1994 Q.28 (D)

Which of the following correctly describes the conditions of different structure of the eyeball?
Ciliary muscles Suspensory ligament Lens
A. contracted tension increased thick
B. contracted tension decreased thick
C. relaxed tension decreased thin
D. relaxed tension increased thin
7. 1995 Q.38 (C)

The “near point” is the nearest point from the eye at which clear vision is possible. The table below shows the
change in the position of the near point with age in a person:
Age (years) Distance of near point from the eye (cm)

10 7
20 10
30 15
40 22
50 40
60 100
Which of the following can be deduced from the above information?

As the person gets older,
A. His ciliary muscles become weaker.
B. The lens of his eyes becomes thicker.
C. He finds it more difficult to read newspapers.
D. The degree of short-sightedness becomes less serious.
8. 1995 Q.39 (C)

A boy was watching a bee which was flying towards him and then landed on his nose. When of the following
graphs shows the change in the curvature of the lens of his eye?
Directions: Questions 9 to 11 refer to the photograph below which shows a section of the eye:
9. 1997 Q.33 (A)
Light-sensitive cells are found on structure(s)
A. 2 only.
B. 7 only.
C. 2 and 5 only.
D. 5 and 7 only.
10. 1997 Q.34 (D)

Which of the following changes occur when a person tries to focus
on a distant object?
Structure 6 Structure 7
A. Contracts More convex
B. Contracts Less convex
C. Relaxes More convex
D. Relaxes Less convex
11. 1997 Q.35 (B)

Which labelled structures help to maintain the shape of the eyeball?
A. 1 and 2
B. 1 and 3
C. 2 and 4
D. 3 and 4
12. 1997 Q.38 (A)

Which of the following statements is correct?
A. A cloudy lens forms dim images.
B. Defects in cones result in night blindness.
C. A long-sighted person cannot see distant objects clearly.
D. If a person cannot distinguish colours at night time, he suffers from colour blindness.
13. 1999 Q.30 (B)

When you are reading through a page, only a few words can be seen clearly each time. This is because
A. Only a few words can be focused onto the retina each time.
B. Only a few words can be focused onto the yellow spot each time.
C. Some words are focused onto the blind spot.
D. The brain can only interpret a few words each time.
14. 1999 Q.33 (D)

The diagram below was drawn by a student to show the path of light rays when a short-sighted person was looking
at a distant object:
What is wrong with this diagram?

A. The rays should be focused on the retina.
B. The rays should be focused behind the retina.
C. The rays from the object should be diverging.
D. The object should not be shown.
Directions: Questions 15 and 16 refer to the graph below, which shows the changes in the tension of the suspensory
ligament of a student’s eye in 10 seconds:
15. 2002 Q.48 (B)
During which period was the student looking at an object moving towards him?
A. 0—2 second
B. 2—4 second
C. 4—8 second
D. 8—10 second
16. 2002 Q.49 (B)

Which of the following graphs represents the corresponding changes in the curvature of the lens of the student in
these 10 seconds?
17. 2002 Q.59 (A)

In a kind of operation, a laser beam is used to reduce the curvature of the cornea of the eye. What is the purpose of
this operation?
A. to decrease the ability of the eye to bend light rays
B. to increase the ability of the eye to bend light rays
C. to decrease the amount of light entering the eye
D. to increase the amount of light entering the eye
18. 2004 Q. 36C (92%)

When a person is watching a bus moving away from him, the suspensory ligaments of his eyes will
A. contract.
B. relax.
C. increase in tension.
D. decrease in tension.
19. 2004 Q.50D (81%)

What condition is shown by the ray diagram below?
A. a short-sighted person looking at a distant object

B. a long-sighted person looking at a distant object
C. a short-sighted person looking at a nearby object
D. a long-sighted person looking at a nearby object
Direction: Questions 20 and 21 refer to the following photograph of a section of the eye:
20. 2005 Q.23D (70%)
21. 2005 Q.24A (64%)
22. 2005 Q.51A (71%)

Directions: Questions 23 and 24 refer to the diagram below, which shows a horizontal section of a
human eye:
23. 2006 Q.10C (13%)
24. 2006 Q.11D (63%)
25. 2006 Q.40C (24%)

26. 2006 Q.41B (20%)
27. 2006 Q. 42D (41%)
28. 2007 Q.48B (59%)
29. 2008 Q.47D (46%)

30. 2008 Q.48B (89%)
31. 2009 Q.30C (75%)
32. 2009 Q.31A (67%)
33. 2012 Q.8A (81%)

34. 2012 Q9D (87%)
35. 2013 Q.27B (64%)
36. 2013 Q.28A (55%)
37. 2015 Q.27C (72%)

38. 2017 Q.27 (C) (71%)
39. 2017 Q.28 (A) (66%)
40. 2018 Q.7 (A) (74%)
41. 2019 Q16 (D) (56%)
42. 2019 Q17 (C) (59%)

43. 2021 Q18 (A)
Ch15.1 Suggested Answers:
15.1 Eye
1 1990 50A
2 1991 44.D
3 1991 45D
4 1993 31C
5 1994 27A
6 1994 28.D
7 1995 38C(X)
8 1995 39C(X)
9 1997 33.A
10 1997 34D
11 1997 35B
12 1997 38A
13 1999 30B
14 1999 33D
15 2002 48B (72%)
16 2002 49B (78%)
17 2002 59A (67%)
18 2004 36C (92%)
19 2004 50D (81%)
20 2005 23D (70%)
21 2005 24A (64%)
22 2005 51A (71%)
23 2006 10C (13%)
24 2006 11D (63%)
25 2006 40C (24%)
26 2006 41B (20%)
27 2006 42D (41%)
28 2007 48B (59%)
29 2008 47D (46%)
30 2008 48B (89%)
31 2009 30C (75%)
32 2009 31A (67%)
33 2012 8A (81%)
34 2012 9D (87%)
35 2013 27B (64%)
36 2013 28A (55%)
37 2015 27C (72%)
38 2017 27C (71%)
39 2017 28A (66%)
40 2018 7A (74%)
41 2019 16D (56%)
42 2019 17C (59%)
43 2021 18A

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Ch15.1/Detecting the environment/Eyes/P.

3. 1991 Q.45 (D)

4. 1993 Q.31 (C)

5. 1994 Q.27 (A)

6. 1994 Q.28 (D)

7. 1995 Q.38 (C)

Age (years) Distance of near point from the eye (cm)

Which of the following can be deduced from the above information?

8. 1995 Q.39 (C)

10. 1997 Q.34 (D)

11. 1997 Q.35 (B)

12. 1997 Q.38 (A)

13. 1999 Q.30 (B)

14. 1999 Q.33 (D)

What is wrong with this diagram?

16. 2002 Q.49 (B)

17. 2002 Q.59 (A)

18. 2004 Q. 36C (92%)

19. 2004 Q.50D (81%)

A. a short-sighted person looking at a distant object

21. 2005 Q.24A (64%)

22. 2005 Q.51A (71%)

23. 2006 Q.10C (13%)

24. 2006 Q.11D (63%)

25. 2006 Q.40C (24%)

27. 2006 Q. 42D (41%)

28. 2007 Q.48B (59%)

29. 2008 Q.47D (46%)

31. 2009 Q.30C (75%)

32. 2009 Q.31A (67%)

33. 2012 Q.8A (81%)

35. 2013 Q.27B (64%)

36. 2013 Q.28A (55%)

37. 2015 Q.27C (72%)

39. 2017 Q.28 (A) (66%)

40. 2018 Q.7 (A) (74%)

41. 2019 Q16 (D) (56%)

42. 2019 Q17 (C) (59%)

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