A colour-blind person cannot – (1) See distant objects (2) See black colour (3) Distinguish between certain colours (4) Have persistence of vision

A colour-blind person cannot – (1) See distant objects (2) See black colour (3) Distinguish between certain colours (4) Have persistence of vision
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(3) Distinguish between certain colours Explanation: Colour blindness or colour vision deficiency is the inability or decreased ability to see coluor, or perceive colour differences, under normal lighting conditions. The most usual cause is a fault in the development of one or more sets of retinal cones that perceive colour in light and transmit that information to the optic nerve. This type of colour blindness is usually a sex-linked condition.
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A colour-blind person cannot (1) see distant objects (2) see black colour (3) distinguish between certain colours (4) have persistence of vision

Description : A colour-blind person cannot (1) see distant objects (2) see black colour (3) distinguish between certain colours (4) have persistence of vision

Last Answer : distinguish between certain colours

Which one of the following is responsible for the working of New-ton's colour disc experiment? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour

Description : Which one of the following is responsible for the working of New-ton's colour disc experiment? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour

Last Answer : (3) Persistence of vision Explanation: A Newton Disc can be created by painting a disc with the seven different colours. A combination of red, green and blue in the circular disc will yield the same result. This is due to the phenomenon called persistence of vision.

Which one of the following is responsible for the working of Newton’s colour disc experiment ? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour

Description : Which one of the following is responsible for the working of Newton’s colour disc experiment ? (1) Formation of pure spectra (2) Formation of impure spectra (3) Persistence of vision (4) Principle of complementary colour

Last Answer : Persistence of vision

A person wears spectators with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes – (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Description : A person wears spectators with concave lenses. It means that normally (when not using glasses), the image of distant objects is focused in his eyes – (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Last Answer : (2) in front of the retina Explanation: A concave lens is used to correct short-sightedness (myopia). In myopia, images are formed in front of the retina, resulting in a blurred image. This ... relatively too long or the refractive powers of the cornea and lens of the eye are relatively too strong.

A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Description : A person wears spectates with concave lenses. It means that normally (when not using glasses), the image of distant objects is focussed in his eyes (1) behind the retina (2) in front of the retina (3) on the retina (4) on the blind spot

Last Answer : in front of the retina

Persons who are colour-blind cannot distinguish between – (1) yellow and white (2) green and blue (3) red and green (4) black and yellow

Description : Persons who are colour-blind cannot distinguish between – (1) yellow and white (2) green and blue (3) red and green (4) black and yellow

Last Answer : (3) red and green Explanation: A person with colour-blindness has trouble seeing red, green, blue, or mixtures of these colours. The most common type is redgreen colours - blindness, where red and green are as the same colour.

A person who can see distant objects clearly but cannot see nearby objects distinctly is suffering from which eye disease?

Description : A person who can see distant objects clearly but cannot see nearby objects distinctly is suffering from which eye disease?

Last Answer : Hypermetropia.

Persistence of vision is the Principle behind: (1) Binocular (2) Cinema (3) Periscope (4) Camera

Description : Persistence of vision is the Principle behind: (1) Binocular (2) Cinema (3) Periscope (4) Camera

Last Answer : (2) Cinema Explanation: Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. In the early days of ... rate of less than 16 frames per second (frame/s) caused the mind to see flashing images.

If we are looking into the past when we look at distant stars, doesn't that mean that when we look at objects in everyday life we see them as they were a moment ago?

Description : If we are looking into the past when we look at distant stars, doesn't that mean that when we look at objects in everyday life we see them as they were a moment ago?

Last Answer : Strictly speaking, yes, that’s true. Light is a physical stuff that takes time to travel. Of course, the delay is so small it’s only worth taking into account with things as insanely far away as stars, and maybe the other planets.

The instrument used to see the distant objects on the Earth is – (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Description : The instrument used to see the distant objects on the Earth is – (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Last Answer : (1) Terrestrial telescope Explanation: A telescope assists the eye chiefly in two way by enlarging the visual angle under which a distant object is seen, and thus magnifying that object; ... organ, thus rendering objects distinct and visible which would otherwise be indistinct and or invisible.

The instrument used to see the distant objects on the Earth is (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Description : The instrument used to see the distant objects on the Earth is (1) Terrestrial telescope (2) Astronomical telescope (3) Compound microscope (4) Simple microscope

Last Answer : Terrestrial telescope

______ is the defect which occurs in eye due to excessive curvature of cornea and person is not able to see distant objects clearly . a)myopia b)hypermetropia c)squint d)cataract

Description : ______ is the defect which occurs in eye due to excessive curvature of cornea and person is not able to see distant objects clearly . a)myopia b)hypermetropia c)squint d)cataract

Last Answer : a)myopia

Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is (a) 0% (b) 25% (c) 50% (d) 75%.

Description : Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is (a) 0% (b) 25% (c) 50% (d) 75%.

Last Answer : (a) 0%

A colour blind girl is rare because she will be born only when (a) her mother and maternal grand father were colour blind (b) her father and maternal grand father were colour blind(c) her mother is colour blind and father has normal vision (d) parents have normal vision but grand parents were colour blind

Description : A colour blind girl is rare because she will be born only when (a) her mother and maternal grand father were colour blind (b) her father and maternal grand father were colour blind (c) ... blind and father has normal vision (d) parents have normal vision but grand parents were colour blind

Last Answer : b) her father and maternal grand father were colour blind

Of both normal parents, the chances of a male child becoming colour blind are (a) none (b) possible only when all the four grand parents had normal vision (c) possible only when father’s mother was colour blind (d) possible only when mother’s father was colour blind.

Description : Of both normal parents, the chances of a male child becoming colour blind are (a) none (b) possible only when all the four grand parents had normal vision (c) possible only when father’s mother was colour blind (d) possible only when mother’s father was colour blind.

Last Answer : (d) possible only when mother’s father was colour blind.

A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy (a) may be colour blind or may be of normal vision (b) must be colour blind (c) must have normal colour vision (d) will be partially colour blind since he is heterozygous for the colour blind mutant allele

Description : A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This boy (a) may be colour blind or ... colour vision (d) will be partially colour blind since he is heterozygous for the colour blind mutant allele

Last Answer : (a) may be colour blind or may be of normal vision

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is (a) 0 (b) 0.5 (c) 0.75 (d) 1.

Description : If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is (a) 0 (b) 0.5 (c) 0.75 (d) 1.

Last Answer : a) 0

Person who is colorblind cannot distinguish between – (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue

Description : Person who is colorblind cannot distinguish between – (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue

Last Answer : (2) Red and green Explanation: Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blind-ness and ... red and green hues due to the absence or mutation of the red or green retinal photoreceptors.

Person who is colourblind cannot distinguish between (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue

Description : Person who is colourblind cannot distinguish between (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue

Last Answer : Red and green

Distant objects are visible as a little out of focus in this condition – (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Description : Distant objects are visible as a little out of focus in this condition – (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Last Answer : (4) myopia Explanation: Myopia, also known as nearsightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing ... at a distant object to be out of focus, but in focus when looking at a close object.

Distant objects are visible as a little out of focus in this condition : (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Description : Distant objects are visible as a little out of focus in this condition : (1) presbiopia (2) hypermetropia (3) astigmatism (4) myopia

Last Answer : myopia

Black and Blue. Red and Green. Yellow and Blue. Green and Grey. I am all colours. You can try to get close to me, but you can't escape my vision. If you get greedy, you will try to take your colours for yourself, but before you know it, I will be eating you for lunch. What am I? -Riddles

Description : Black and Blue. Red and Green. Yellow and Blue. Green and Grey. I am all colours. You can try to get close to me, but you can't escape my vision. If you get greedy, you will try to take your colours for yourself, but before you know it, I will be eating you for lunch. What am I? -Riddles

Last Answer : A Chameleon.

The instrument used to see the distant objects on the earth is –

Description : The instrument used to see the distant objects on the earth is –

Last Answer : Terrestrial Telescope

The person suffering from “myopia” cannot see the objects at: (1) Near distance (2) Longer distance (3) any distance (4) Close to eye

Description : The person suffering from “myopia” cannot see the objects at: (1) Near distance (2) Longer distance (3) any distance (4) Close to eye

Last Answer : (2) Longer distance Explanation: Nearsightedness, also known as myopia, is a common type of refractive error where close objects appear clearly, but distant objects appear blurry.

Light colours absorb less heat therefore these are not heated as much as the black colour.

Description : Light colours absorb less heat therefore these are not heated as much as the black colour.

Last Answer : Ans: Dark colours do not exactly absorb more heat, but they do convert a higher percentage of light into heat. In the sun with a dark coloured shirt it gets hot, where a lighter ... and converted into heat. White objects reflect all visible light, where black objects absorb all visible light.

The sky appears blue because – (1) All colours interfere to produce blue (2) In white light, the blue component dominates (3) The atmosphere scatters blue colour more than the others (4) It is actually blue

Description : The sky appears blue because – (1) All colours interfere to produce blue (2) In white light, the blue component dominates (3) The atmosphere scatters blue colour more than the others (4) It is actually blue

Last Answer : (3) The atmosphere scatters blue colour more than the others Explanation: Diffuse sky radiation is solar radiation reaching the Earth's surface after having been scattered from the direct solar beam by ... the atmosphere (approximately 25% of the incident radiation when the sun is high in the Sky.

Sun appears red in colour at sun-rise and sunset due to – (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun Comes out of the mountains (4) that all other colours scatter away except red

Description : Sun appears red in colour at sun-rise and sunset due to – (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun Comes out of the mountains (4) that all other colours scatter away except red

Last Answer : (4) that all other colours scatter away except red Explanation: According to Rayleigh's law, the intensity of scattered light varies inversely as the fourth power of its wavelength. Sunlight consists of ... have to travel a larger part of the atmosphere because they are very close to the horizon.

The blue colour of water in the sea is due to – (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water

Description : The blue colour of water in the sea is due to – (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water

Last Answer : (1) absorption of other colours except blue by water molecules Explanation: Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green ... to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the

Sun appears red in colour at sunrise and sunset due to (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun comes out of the mountains (4) that all other colours scatter away except red

Description : Sun appears red in colour at sunrise and sunset due to (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun comes out of the mountains (4) that all other colours scatter away except red

Last Answer :  that all other colours scatter away except red

The blue colour of water in the sea is due to (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water

Description : The blue colour of water in the sea is due to (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water

Last Answer : absorption of other colours except blue by water molecules

The sky appears blue because (1) all colours interfere to produce blue (2) in white light, the blue component dominates (3) the atmosphere scatters blue colour more than the others (4) it is actually blue

Description : The sky appears blue because (1) all colours interfere to produce blue (2) in white light, the blue component dominates (3) the atmosphere scatters blue colour more than the others (4) it is actually blue

Last Answer : the atmosphere scatters blue colour more than the others

With regard to efferent pupillary defect: a. the pupil reacts poorly to light and accommodation b. anisocoria is a feature c. the affected eye has poor distant vision d. a lesion in the sympathetic pathway is a recognized cause

Description : With regard to efferent pupillary defect: a. the pupil reacts poorly to light and accommodation b. anisocoria is a feature c. the affected eye has poor distant vision d. a lesion in the sympathetic pathway is a recognized cause

Last Answer : a lesion in the sympathetic pathway is a recognized cause

A pilot can improve the probability of detecting other aircrafts by: a. Minimizing the duration of eye rests and making as many eye movements as possible b. Moving the head frequently to alter the apparent motion of any distant object c. Maximizing the time spent looking in each sector to allow the maximum chance of detecting movement d. Maintaining as far as possible a lookout ahead of the aircraft and relying on peripheral vision to detect any movement from the side

Description : A pilot can improve the probability of detecting other aircrafts by: a. Minimizing the duration of eye rests and making as many eye movements as possible b. Moving the head frequently to ... lookout ahead of the aircraft and relying on peripheral vision to detect any movement from the side

Last Answer : a. Minimizing the duration of eye rests and making as many eye movements as possible

A pilot can improve the probability of detecting other aircrafts by: a. Minimizing the duration of eye rests and making as many eye movements as possible b. Moving the head frequently to alter the apparent motion of any distant object c. Maximizing the time spent looking in each sector to allow the maximum chance of detecting movement d. Maintaining as far as possible a lookout ahead of the aircraft and relying on peripheral vision to detect any movement from the side

Description : A pilot can improve the probability of detecting other aircrafts by: a. Minimizing the duration of eye rests and making as many eye movements as possible b. Moving the head frequently to ... a lookout ahead of the aircraft and relying on peripheral vision to detect any movement from the side

Last Answer : a. Minimizing the duration of eye rests and making as many eye movements as possible

Give reason: a) When we suddenly enter a cinema hall, we will not be able to see any objects.b) There is no image formation at blind spot.

Description : Give reason: a) When we suddenly enter a cinema hall, we will not be able to see any objects.b) There is no image formation at blind spot.

Last Answer : a) When we suddenly enter a cinema hall, we will not be able to see any objects. Our eyes take some time to adjust to the light in the surroundings. When we are in bright area pupil constricts. ... region where the optic nerve exits the eye ball. There are no sensory cells. Hence no image is formed.

Distant objects are visible as a little out of focus in the condition:

Description : Distant objects are visible as a little out of focus in the condition:

Last Answer : Myopia

While working on a plane table, the correct rule is: (A) Draw continuous lines from all instrument stations (B) Draw short rays sufficient to contain the points sought (C) Intersection should be obtained by actually drawing second rays (D) Take maximum number of sights as possible from each station to distant objects

Description : While working on a plane table, the correct rule is: (A) Draw continuous lines from all instrument stations (B) Draw short rays sufficient to contain the points sought (C) Intersection ... drawing second rays (D) Take maximum number of sights as possible from each station to distant objects

Last Answer : (B) Draw short rays sufficient to contain the points sought

Radar is used to (1) locate submerged submarines. (2) receive signal from radio receivers. (3) detect and locate distant objects. (4) locate geostationary satellites.

Description : Radar is used to (1) locate submerged submarines. (2) receive signal from radio receivers. (3) detect and locate distant objects. (4) locate geostationary satellites.

Last Answer :  detect and locate distant objects

One can distinguish a telescope from a microscope by observing – (1) length (2) colour (3) size of the lens (4) length and size of the lens

Description : One can distinguish a telescope from a microscope by observing – (1) length (2) colour (3) size of the lens (4) length and size of the lens

Last Answer : (4) length and size of the lens Explanation: Telescope and Microscope are two scientific instruments that serve their purposes differently. One of the main differences between a telescope and a ... the distance from the focal point to the lens is different in these two scientific instruments.

One can distinguish a telescope from a microscope by observing (1) length (2) colour (3) size of the lens (4) length and size of the lens

Description : One can distinguish a telescope from a microscope by observing (1) length (2) colour (3) size of the lens (4) length and size of the lens

Last Answer : length and size of the lens

Ability of the eye to see objects at all distances is called (a) Binocular vision (b) Myopia (c) Hypermetropia (d) Accommodation

Description : Ability of the eye to see objects at all distances is called (a) Binocular vision (b) Myopia (c) Hypermetropia (d) Accommodation

Last Answer : Ans:(d)

23 Which one of the following sets of colour combinations is added in colour vision in TV? A. Red, green and blue B. Orange, black and violet C. White, red and Yellow D. Green, Yellow and Blue

Description : 23 Which one of the following sets of colour combinations is added in colour vision in TV? A. Red, green and blue B. Orange, black and violet C. White, red and Yellow D. Green, Yellow and Blue

Last Answer : ANSWER: A

Temperature of distant luminous bodies can be determined by (1) Mercury thermometers (2) Gas thermometers (3) Pyrometers (4) Colour thermometers

Description : Temperature of distant luminous bodies can be determined by (1) Mercury thermometers (2) Gas thermometers (3) Pyrometers (4) Colour thermometers

Last Answer : Pyrometers

.A person whose father is colour blind marries a lady whose mother is daughter of a colour blind man. Their children will be (a) all sons colour blind (b) some sons normal and some colour blind (c) all colour blind (d) all daughters normal.

Description : .A person whose father is colour blind marries a lady whose mother is daughter of a colour blind man. Their children will be (a) all sons colour blind (b) some sons normal and some colour blind (c) all colour blind (d) all daughters normal.

Last Answer : (d) all daughters normal.

What are every day objects that reflect all the colours in sunlight?

Description : What are every day objects that reflect all the colours in sunlight?

Last Answer : What is the answer ?

An object which absorbs all colours and reflects none appears: (1) White (2) Grey (3) Blue (4) Black

Description : An object which absorbs all colours and reflects none appears: (1) White (2) Grey (3) Blue (4) Black

Last Answer : (4) Black Explanation: A surface that absorbs all colours, reflecting none, is said to be black. Black is not a colour; it absorbs all the colours of the visible spectrum and reflects none of them to the eyes. White is a colour.

Why does a black board appears black in color? (1) It reflects black color (2) It absorbs black color (3) It reflects all colors (4) It absorbs all the colours

Description : Why does a black board appears black in color? (1) It reflects black color (2) It absorbs black color (3) It reflects all colors (4) It absorbs all the colours

Last Answer : (4) It absorbs all the colors Explanation: When white light falls on an opaque body, it absorbs all the colors except one color which it reflects; this reflected color is the color of the body.

A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear (1) Black (2) White (3) Grey (4) Opaque

Description : A ray of white light strikes the surface of an object. If all the colours are reflected, the surface would appear (1) Black (2) White (3) Grey (4) Opaque

Last Answer : (2) White Explanation: Objects do not have any colour of their own. When light hits a surface, some of it is absorbed and some of it is reflected. The light that is reflected is ... appear white when they reflect all the wavelengths; they appear black when they absorb all visible wavelengths.

An object which absorbs all colours and reflects none appears: (1) white (2) grey (3) blue (4) black

Description : An object which absorbs all colours and reflects none appears: (1) white (2) grey (3) blue (4) black

Last Answer : black

Would a flash grenade blind you if you were wearing night vision goggles?

Description : Would a flash grenade blind you if you were wearing night vision goggles?

Last Answer : answer:I found this data point. I cannot vouch for its validity: “The main drawback of night vision is that it limits the width of your vision slightly, and increases the blindness effect caused by flash grenades.”