Engineering Questions with Answers - Multiple Choice Questions

MCQs on Sensory Organs – 2

1 - Question

In human ear, secretion of wax is done by___________
a) Cochlea
b) Vestibule
c) Basilar membrane
d) Ceruminous glands

View Answer

Answer: d
Explanation: Human ear has the number of sweat glands called ceruminous glands. These glands are present on the skin from exterior to interior part. The secretion of these glands called cerumen or wax.

2 - Question

Human ear converts sound energy to mechanical energy which is transmitted to the brain through nerve impulse.
a) True
b) False

View Answer

Answer: a
Explanation: The human ear works as a transducer which converts sound energy into mechanical energy to a nerve impulse which further detected by the brain.

3 - Question

Conversion of vibrations into compressed wave takes place in which part of human ear?
a) Inner ear
b) Middle ear
c) Outer ear
d) Exterior ear

View Answer

Answer: a
Explanation: Ear is broadly divided into three parts that are outer, middle, and inner. Sound wave goes through the outer ear gets converted to vibration by middle ear. Passing of vibration to inner ear further converts it in the form of compresses wave.

4 - Question

Name the light absorbing pigment present in the Rods?
a) Neuroglia
b) Aqueous humor
c) Rhodopsin
d) Perikaryon

View Answer

Answer: c
Explanation: The light absorbing pigment present in the rods is rhodopsin and it is also a G-protein coupled receptor which upon activation activates transducin.

5 - Question

Name the G- protein, which takes part in vision?
a) Ethylene
b) Adenosine
c) Acetylcholine
d) Transducin

View Answer

Answer: d
Explanation: Rhodopsin activates molecules of transducin which further activates an enzyme to break down cyclic GMP. The drop in cyclic GMP will open sodium channel which is responsible for vision.

6 - Question

What is the absorption peak of green absorbing cones?
a) 565 nm
b) 535 nm
c) 768 nm
d) 440 nm

View Answer

Answer: b
Explanation: The color vision of our eye is dependent on the three types of cones, i.e., green absorbing, red absorbing cones, and blue absorbing cones.

7 - Question

Which of the following is NOT true for Rods?
a) Used for scotopic vision
b) Loss causes night blindness
c) Not very light sensitive
d) Confer achromatic vision

View Answer

Answer: c
Explanation: Rods are very light sensitive while cons are not that much light sensitive. Cons enable us to see colors by producing sharpest images.

8 - Question

Name the tiny bone of the middle ear, which convert sound into vibration?
a) Stapes
b) Malleus
c) Incus
d) Anvil

View Answer

Answer: a
Explanation: The space of the middle ear is filled with air where the tympanic membrane separates the inner and external ear. Eardrum transfer sound energy to middle ear, which in turn convert it to vibrate.

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