Vision and Hearing Physiology Short Questions and Answers

Questions

41 Duration of temporary blindness on going suddenly from brightness to dark and vice-versa in our eyes is for:

A 1-2 seconds

B 2-5 seconds

C 5-10 seconds

D 10-30 seconds

View Answer

Answer: 1-2 seconds

42 When the near objects are to be focused by our eye then the:

A Ciliary muscles are relaxed and lens is flattened to have maximum focal length

B Ciliary muscles are contracted and lens becomes maximum convex

C Ciliary muscles are relaxed and the lens becomes maximum convex

D Ciliary muscles are contracted and the lens becomes flattened

View Answer

Answer: Ciliary muscles are contracted and lens becomes maximum convex

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43 At rest the mammalian eye is focused for distant objects by:

A Relaxation of ciliary muscles which flattens the lens and enables it to have maximum focal length

B Contraction of ciliary muscles which makes lens maximum convex

C Relaxation of ciliary muscles which makes the lens maximum convex

D Contraction of ciliary muscles that makes lens flattened

View Answer

Answer: Relaxation of ciliary muscles which flattens the lens and enables it to have maximum focal length

44 Mammalian eyes have remarkable power of accommodation by:

A Having well developed protractor lentis muscles

B Capability of changing the size of eye ball

C Capability to change the convexity of lens which changes its focal length

D None of these

View Answer

Answer: Capability to change the convexity of lens which changes its focal length

45 A slight accommodation in frog's eyes can be brought about by:

A Protractor lentis muscles

B Retractor lentis muscles

C Ciliary muscles

D None of these

View Answer

Answer: Protractor lentis muscles

46 Frog's eyes are capable of:

A Maximum accommodation

B Slight accommodation

C No accommodation

D None of these

View Answer

Answer: Slight accommodation

47 In water the frogs are:

A Hypermetropic

B Myopic

C Normal sighted

D None of these

View Answer

Answer: Hypermetropic

48 On land frogs are:

A Hypermetropic

B Myopic

C Normal sighted

D None of these

View Answer

Answer: Myopic

49 The nerve centre for sight is located in:

A Thalamus

B Cerebral cortex

C Both (a) & (b)

D None of these

View Answer

Answer: Both (a) & (b)

50 Least distance vision for a person of hypermetropia is:

A 25 cms

B Less than 25 cms

C More than 25 cms

D Infinity

View Answer

Answer: 25 cms

51 With the change in the intensity of light from one to one hundred the response of our eye will be increased by:

A 0.01

B 2

C 10

D 100

View Answer

Answer: 0.01

52 Night blindness is caused by:

A Hypermetropia

B Myopia

C Defective cornea

D Deficiency of rhodopsin

View Answer

Answer: Deficiency of rhodopsin

53 During night the slow intensity of light is detected by:

A Cones

B Rods

C Both (a) & (b)

D Crystalline lens

View Answer

Answer: Crystalline lens

54 Which of the following organs is involved to help us feel the earthquake:

A Eye

B Skin of sole

C Ear

D None of these

View Answer

Answer: Ear

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