Danger signals are generally red as red light – (1) is least bright (2) undergoes least deviation (3) has lowest velocity (4) gives comfort to eye

Danger signals are generally red as red light – (1) is least bright (2) undergoes least deviation (3) has lowest velocity (4) gives comfort to eye
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(2) undergoes least deviation Explanation: The primary reason why the colour red is used for danger signals is that red light is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Therefore blue which has the least wavelength of all the visible radiations is scattered the most and red which has the highest wavelength of all the colours we can see is scattered the least.
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Danger signals are generally red as red light (1) is least bright (2) undergoes least deviation (3) has lowest velocity (4) gives comfort to eye

Description : Danger signals are generally red as red light (1) is least bright (2) undergoes least deviation (3) has lowest velocity (4) gives comfort to eye 

Last Answer : undergoes least deviation 

A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet

Description : A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet

Last Answer : ANSWER: W -- RED

The danger signals are red while the eye is more sensitive to yellow because – (1) absorption in red is less than yellow and hence red is visible from a distance (2) scattering in yellow light is less than red (3) the wavelength of red light is more than yellow light (4) none of the above reasons

Description : The danger signals are red while the eye is more sensitive to yellow because – (1) absorption in red is less than yellow and hence red is visible from a distance (2) scattering in yellow light is less than red (3) the wavelength of red light is more than yellow light (4) none of the above reasons

Last Answer : (3) the wavelength of red light is more than yellow light

A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction? Is it: A. Red B. yellow C. Blue D. violet Engineering

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Last Answer : A. Red

The danger signals are red while the eye is more sensitive to yellow because.

Description : The danger signals are red while the eye is more sensitive to yellow because.

Last Answer : The danger signals are red while the eye is more sensitive to yellow because.

The danger level should be marked with a bright red band …… wide centrally over a white band …… wide for a length of……… a) 5 cm, 10 cm, 60 cms* b) 10 cm, 20 cm, 60 cm c) 15 cm, 30 mm, 60 cm d) None of the above

Description : The danger level should be marked with a bright red band …… wide centrally over a white band …… wide for a length of……… a) 5 cm, 10 cm, 60 cms* b) 10 cm, 20 cm, 60 cm c) 15 cm, 30 mm, 60 cm d) None of the above

Last Answer : a) 5 cm, 10 cm, 60 cms*

A far-sighted person, without optical correction, is typically able to see nearby objects more clearly in bright light. The reason for this phenomena is: w) bright light provides better illumination. x) the pupil of the eye narrows which increases the depth of focus. y) the pupil of the eye widens which increases the depth of focus. z) the bright light causes squinting which flattens the eyeball which tends to correct the far-sighted condition.

Description : A far-sighted person, without optical correction, is typically able to see nearby objects more clearly in bright light. The reason for this phenomena is: w) bright light provides better ... bright light causes squinting which flattens the eyeball which tends to correct the far-sighted condition.

Last Answer : ANSWER: X -- THE PUPIL OF THE EYE NARROWS WHICH INCREASES THE DEPTH OF FOCUS

The danger signals are red not yellow because

Description : The danger signals are red not yellow because

Last Answer : the wavelength of red light is more

Which colour of light shows maximum deviation when passed through a prism? (1) Red (2) Green (3) Violet (4) Yellow

Description : Which colour of light shows maximum deviation when passed through a prism? (1) Red (2) Green (3) Violet (4) Yellow

Last Answer : (3) Violet Explanation: When passed through a prism violet colour of light shows maximum deviation. As white light passes through a prism, the voilet component, having the minimum wave length observes the maximum refractive index for the prism and, thus, gets deviated to the maximum extent.

Which colour of light shows maximum deviation when passed through a prism? (1) White (2) Red (3) Violet (4) Green

Description : Which colour of light shows maximum deviation when passed through a prism? (1) White (2) Red (3) Violet (4) Green

Last Answer : (3) Violet Explanation: The angle of deviation, by which the light of a particular wavelength gets deviated on passing through a medium, depends upon the refractive index of the medium, as ... wavelength. The smaller the wavelength of the passing light, the greater is the refractive index observed.

Which colour of light shows maximum deviation when passed through a prism ? (1) Red (2) Green (3) Violet (4) Yellow

Description : Which colour of light shows maximum deviation when passed through a prism ? (1) Red (2) Green (3) Violet (4) Yellow

Last Answer : Violet

A glass prism has a refracting angle of `60^@`. The angle of minimum deviation is `40^@`. If velocity of light in vacuum is `3 xx 10^8 m//s`. Calculat

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When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye lens. (2) the retina retains the bright images for sometime and becomes momentarily insensitive. (3) the iris is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Description : When a person walking in bright Sunlight enters a dark room, he is not able to see clearly for a little while because (1) the eye muscles cannot immediately adjust the focal length of the eye ... is unable to contract the pupil immediately. (4) the iris is unable to dilate the pupil immediately.

Last Answer : the iris is unable to dilate the pupil immediately.

Will there be any eye problem if you read a book in bright light ?

Description : Will there be any eye problem if you read a book in bright light ?

Last Answer : Yes, don't wear it like this all the time. You use egg lights or energy bulbs at night.

If the light source in front of an eye becomes bright suddenly :-

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When a person enters a dark room from bright light he is not able to see clearly for little while because ______ A. Eye is unable to adjust itself immediately B. Retina becomes insensitive momentarily C. Iris is unable to dilate the pupil immediately D. Distance between the lens and retina take time to adjust

Description : When a person enters a dark room from bright light he is not able to see clearly for little while because ______ A. Eye is unable to adjust itself immediately B. Retina becomes insensitive ... is unable to dilate the pupil immediately D. Distance between the lens and retina take time to adjust

Last Answer : ANSWER: C

When a person enters a dark room from bright light, he is not able to see clearly for a little while because the (a) eye is unable to adjust itself immediately (b) retina becomes insensitive momentarily (c) iris is unable to dilate the pupil immediately (d) distance between the lens and retina takes time to adjust

Description : When a person enters a dark room from bright light, he is not able to see clearly for a little while because the (a) eye is unable to adjust itself immediately (b) retina becomes insensitive ... is unable to dilate the pupil immediately (d) distance between the lens and retina takes time to adjust

Last Answer : Ans:(c)

When a person enters a dark room from bright light he is not able to see clearly for a little while because the? A. Eye is unable to adjust itself immediately B. Retina becomes insensitive momentarily C. Iris is unable to dilate the pupil immediately (Answer) D. Distance between the lens and retina take time to adjust

Description : When a person enters a dark room from bright light he is not able to see clearly for a little while because the? A. Eye is unable to adjust itself immediately B. Retina becomes insensitive ... to dilate the pupil immediately (Answer) D. Distance between the lens and retina take time to adjust

Last Answer : C. Iris is unable to dilate the pupil immediately (Answer)

The following are true about spectral sensitivity of the retina: a. in scotopic conditions, the peak sensitivity of the eye is near 500 nm b. under photopic conditions the peak sensitivity is near 555 nm c. in the presence of a bright yellow steady background light the retina has a peak sensitivity near 440 nm to a 25-Hz stimulus d. all above

Description : The following are true about spectral sensitivity of the retina: a. in scotopic conditions, the peak sensitivity of the eye is near 500 nm b. under photopic conditions the peak sensitivity is near 555 nm c ... light the retina has a peak sensitivity near 440 nm to a 25-Hz stimulus d. all above

Last Answer : all above

The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

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The part of the human brain which is an important relay station for the sensory impulses and also is the origin of many of the involuntary acts of the eye such as the narrowing of the pupil in bright light is the: a) hypothalamus b) midbrain c) corpus callosum d) cerebellum

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Red light is used for signals because it has – (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium

Description : Red light is used for signals because it has – (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium

Last Answer : (1) long wavelength Explanation: Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is ... the colours and is able to travel the longest distance through fog, rain, and the alike.

Red light is used for signals because it has (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium

Description : Red light is used for signals because it has (1) long wavelength (2) high intensity (3) high frequency (4) low refraction in the medium

Last Answer : long wavelength

Red is used as an emergency or danger signal as – (1) it is a striking colour (2) its wavelength is the longest (3) it is scattered (4) it has very high energy

Description : Red is used as an emergency or danger signal as – (1) it is a striking colour (2) its wavelength is the longest (3) it is scattered (4) it has very high energy

Last Answer : (2) its wavelength is the longest Explanation: The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.

Red is used as an emergency or danger signal as (1) it is a striking colour (2) its wavelength is the longest (3) it is scattered (4) it has very high energy

Description : Red is used as an emergency or danger signal as (1) it is a striking colour (2) its wavelength is the longest (3) it is scattered (4) it has very high energy

Last Answer : its wavelength is the longest

An electron microscope gives higher magnification than an optical microscope, because: (1) It uses more powerful lenses (2) the velocity of electron is smaller than that of visible (3) the electrons have more energy than the light particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

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Last Answer : (2) The wavelength of electrons is smaller as compared to the wavelength of visible light Explanation: An electron microscope is a microscope that uses a beam of accelerated electrons as a spume ... a higher resolving power than a light microscope and can reveal the structure of smaller objects.

An electron microscope gives higher magnifications than an optical microscope because : (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as compared to the wavelength of visible light (3) The electrons have more energy than the light particulars (4) The electron microscope uses more powerful lenses

Description : An electron microscope gives higher magnifications than an optical microscope because : (1) The velocity of electrons is smaller than that of light (2) The wavelength of electrons is smaller as ... have more energy than the light particulars (4) The electron microscope uses more powerful lenses 

Last Answer : The wavelength of electrons is smaller as compared to the wavelength of visible light

An electron microscope gives higher magnification than an optical microscope, because : (1) it uses more powerful lenses (2) the velocity of electron is smaller than that of visible light (3) the electrons have more energy than the light particles (4) the wavelength of electrons is smaller as compared to the wavelength of visible light

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Last Answer : the wavelength of electrons is smaller as compared to the wavelength of visible light

Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is: w) blue-white x) bright red y) yellow z) orange

Description : Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is: w) blue-white x) bright red y) yellow z) orange

Last Answer : ANSWER: W -- BLUE-WHITE

All are seen in 3rd nerve palsy except: a. Ptosis b. Diplopia c. Miosis d. Outwards eye deviation

Description : All are seen in 3rd nerve palsy except: a. Ptosis b. Diplopia c. Miosis d. Outwards eye deviation

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There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There are no reflective surfaces on the island and no on can communicate with each other other than the leader to the residents. No one on the island knows how many of each eye color there is. Everyone on the island is a perfect logician, meaning that if there is a solution they'll find it. Every morning the leader gives anyone a chance to leave the island by guessing their eye color. One morning, the leader gathers all 200 residents to make an announcement, he says 'at least 1 person on this island has blue eyes' How many people leave the island and in how many days after the announcement? Notes: this is

Description : There is an island with exactly 201 residents, 100 with blue eyes, 100 with brown eyes, and the island leader (who has green eyes). To leave the island, one must know their own eye color. There ... How many people leave the island and in how many days after the announcement? Notes: this is -Riddles

Last Answer : All 100 blue eyed people in 100 days. EXPLANATION: imagine there is only 1 person on the island, he will look around and see that there are no blue eyed people, he will then know his eye color in ... is needed to know their own eye color. if you would like more info, search '100 blue eyes riddle

The audio signals of TV are – (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Description : The audio signals of TV are – (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

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The audio signals of TV are : (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Description : The audio signals of TV are : (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

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The audio signals of TV are (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Description : The audio signals of TV are (1) Amplitude modulated (2) Frequency modulated (3) Unmodulated (4) Velocity modulated

Last Answer : Frequency modulated

When white light is passed through a double slit which of the following statements is TRUE: w) Each of the bright bands is dispersed into a spectrum x) Only the central band is dispersed into a spectrum y) All the bright bands except the central one are dispersed into a spectrum z) Each band has a single color different from its neighboring bands

Description : When white light is passed through a double slit which of the following statements is TRUE: w) Each of the bright bands is dispersed into a spectrum x) Only the central band is dispersed into ... one are dispersed into a spectrum z) Each band has a single color different from its neighboring bands 

Last Answer : ANSWER: Y -- ALL THE BRIGHT BANDS EXCEPT THE CENTRAL ONE ARE DISPERSED INTO THE SPECTRUM

What do you do to tempt fate, flirt with danger, and spit in the eye of superstition?

Description : What do you do to tempt fate, flirt with danger, and spit in the eye of superstition?

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A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin (Q). Ozonolysis o

Description : A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin (Q). Ozonolysis o

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A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin (Q). Ozonolysis o

Description : A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin (Q). Ozonolysis o

Last Answer : A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration ... respectively, are: A. B. C. D.

A carbonyl compound (P) which gives positive iodoform test, undergoes reaction with MeMgBr followed by dehydration to give an olefin (Q). Ozonolysis o

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When a liquid moves through a pipe having a varying diameter, the pressure against the inside walls of the pipe will be: w) the same throughout x) lowest where the diameter is smallest y) lowest where the diameter is largest z) lowest where the velocity of flow is lowest

Description : When a liquid moves through a pipe having a varying diameter, the pressure against the inside walls of the pipe will be: w) the same throughout x) lowest where the diameter is smallest y) lowest where the diameter is largest z) lowest where the velocity of flow is lowest 

Last Answer : ANSWER: X -- LOWEST WHERE THE DIAMETER IS SMALLEST

Which of these travels in glass with minimum velocity? (1) red light (2) violet light (3) green light (4) yellow light

Description : Which of these travels in glass with minimum velocity? (1) red light (2) violet light (3) green light (4) yellow light

Last Answer : (2) violet light Explanation: Red light has a longer wavelength than violet light and the other colours of visible light have intermediate wavelengths. As light passes from air into glass, there is ... and is refracted the least, while violet waves travel the slowest and is refracted the most.

Which of these travels in glass with minimum velocity ? (1) red light (2) violet light (3) green light (4) yellow light

Description : Which of these travels in glass with minimum velocity ? (1) red light (2) violet light (3) green light (4) yellow light

Last Answer : violet light

I am black of eye and bright of hair And my feet are firmly in the ground. I love the sun upon my face And I follow it around. When I am dead and gone tis said, That I will droop real low, That I will keep the birds well fed, Standing stiff there in my row. What am I? -Riddles

Description : I am black of eye and bright of hair And my feet are firmly in the ground. I love the sun upon my face And I follow it around. When I am dead and gone tis said, That I will droop real low, That I will keep the birds well fed, Standing stiff there in my row. What am I? -Riddles

Last Answer : A sunflower.

I have an eye in the middle of me, but as you see, I cannot see. I am dark and not far away. You don't see me every day. I am not night and I am not bright. I can have twists and water and scares. What am I? -Riddles

Description : I have an eye in the middle of me, but as you see, I cannot see. I am dark and not far away. You don't see me every day. I am not night and I am not bright. I can have twists and water and scares. What am I? -Riddles

Last Answer : A hurricane.

I am black of eye and bright of hair. I fast in to the ground and follow my **** as he races around the world.What am I? -Riddles

Description : I am black of eye and bright of hair. I fast in to the ground and follow my lord as he races around the world.What am I? -Riddles

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When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye lens (b) The retina retains the bright images for some time and becomes momentarily insensitive (c) The iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Description : When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because (a) The eye muscles cannot immediately change the focal length of the eye ... iris is unable to contract the pupil immediately (d) The iris is unable to dilate the pupil immediately

Last Answer : Ans:(d)

Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs (c) Temporary adjustments of the dumpy level are to be performed at every set up (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings

Description : Which one of the following statements is not correc t? (a) Parallax error is eliminated when there is no change in the staff reading when eye is moved up and down (b) The objective lens is ... (d) The eyepiece need not be adjusted after the first set up when the same surveyor is taking readings

Last Answer : (b) The objective lens is to be focused towards a white or bright background for clear visibility of cross-hairs

Which of the following colour of light deviates least through the prism? (1) yellow (2) green (3) violet (4) red

Description : Which of the following colour of light deviates least through the prism? (1) yellow (2) green (3) violet (4) red

Last Answer : (4) red Explanation: In refracting media like glass prism, water, etc., lights of different colors travel with different speeds. The speed of violet colour is the least, while the speed of red ... violet colour is deviated the most, while red colour is deviated least on passing through the prism.

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is - (1) the violet ray (2) the red ray (3) the green ray (4) the blue ray

Description : When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is - (1) the violet ray (2) the red ray (3) the green ray (4) the blue ray

Last Answer : (2) the red ray Explanation: Red is deviated the least and violet the most.