MULTIPLE CHOICE QUESTIONS
Tick () the most appropriate option.
1. Visible light has electromagnetic waves between :
(a) 8000 Å to 6000 Å (b) 8000 Å to 1000 Å (c) 8000 Å to 4000 Å (d) 8000 Å to 2000 A
2. 1 Angstrom unit (Å) is equal to :
(a) 10-10 m
(b) 10-12 m
(c) 108 m
(d) 104 m
3. The most visible colour of visible spectrum is :
(a) blue
(b) red
(C) green
(d) orange
4. The band of seven colours formed, when white light passes through an equilateral prism is called :
(a) dispersion
(6) colour band
(c) spectrum
(d) none of these
5. Violet, green, red and yellow are the four colours formed on a white screen when a polychromatic light is
dispersed. The arrangement of colours in the decreasing order of wavelengths is :
(a) green, red, yellow and violet
(b) red, yellow, green and violet
(c) violet, green, yellow and red
(d) violet, green, red and yellow
6. The angle of deviation is maximum for
when the dispersion of polychromatic light takes place.
(a) red
(b) violet
(c) green
(d) blue
7. Which is not a source of ultraviolet radiations?
(a) Sun
(b) Arc lamp
(c) Electric heater (d) Stars
8. The electromagnetic radiation which are useful in night photography is :
(a) infrared rays
(b) ultraviolet rays
(c) visible light
(d) X-rays
9. The electromagnetic wave associated with high energy is :
(a) ultraviolet ray (b) X-ray
(c) gamma ray
(d) infrared ray
10. During the Sunset the colour which scatters closest to the eye of observer is :
(a) yellow
(c) blue
(d) violet
11. Infrared rays with very large wavelength are easily reflected by
(b) glass
(c) carbon dioxide molecules
(d) both (b) and (c)
12. X-rays are produced by
(a) oscillating circuits in special vacuum tubes (b) excitation of outermost electronic shell of an atom
(c) excitation of inner electron of atom and is sudden annihilation of high energy free electrons.
(d) nucleus of an atom, by the destruction of high energy particle
(b) red
(a) air
please answer all. it's very urgent
Answers
Answer:
1 The visible light spectrum is the segment of the electromagnetic spectrum that the human eye can view. More simply, this range of wavelengths is called visible light. Typically, the human eye can detect wavelengths from 380 to 700 nanometers.
2 1angstrom =
0.1 nanometre
Explanation:
3 Structures in the eye called rods help us to see during low-light situations and yellow is the most visible color from a distance in darkness. This is one reason why taxi cabs are often yellow. In daylight the most visible color is one with a wavelength of 550 nanometers which is a color between green and yellow.
4 spectrum
5 d ) violet, green, red and yellow
6 a red
7 stars
8 a) infrared rays
9 d) infrared ray
10 d) violet
11 c) carbon dioxide molecules
12 c) excitation of inner electron of atom and is sudden annihilation of high energy free electrons.