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Physics [1 Mark Question Answer]

Spectrum · ICSE STD 10 (ICSE - English Medium). 63 questions.

Questions · Page 1 of 2

[1 Mark Question Answer]

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50 questions · timed · auto-graded

Question 11 Mark
What characteristic property of light is responsible for the blue colour of the sky?
Answer
The scattering property of light is responsible for the blue colour of the sky as the blue colour is scattered the most due to its short wavelength.
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Question 21 Mark
Which colour of white light is scattered the least? Give reason.
Answer
The light having the largest wavelength is scattered the least. Hence, red coloured light is scattered the least.
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Question 31 Mark
A beam of blue, green and yellow light passes through the the Earth's atmosphere. Name the colour which is scattered the most
Answer
Blue light has the lowest wavelength out of the three radiations. Hence, it gets scattered the most.
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Question 41 Mark
A Beam of Blue, Green, and Yellow Light Passes Through The Earth's Atmosphere. Name the Colour Which is Scattered the Least.
Answer
Yellow light has the highest wavelength out of the three radiations. Hence, it gets scattered the least.
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Question 51 Mark
When sunlight enters the earth’s atmosphere, state which colour of light is scattered the most and which the least.
Answer
Violet colour is scattered the most and red the least as the intensity of scattered light is found to be inversely proportional to the fourth power of wavelength of light.
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Question 61 Mark
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling
Answer
Electromagnetic wave is travelling through air.
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Question 101 Mark
A wave has wavelength 50Å of State its one use.
Answer
X-rays are used to study atomic arrangement in crystals as well as complex molecules.
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Question 111 Mark
A wave has wavelength 50Å of State the speed in vacuum.
Answer
The speed of the wave will be $3 \times 10^8 m / s$ in vacuum.
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Question 121 Mark
A wave has wavelength 50Å of name the wave.
Answer
The wavelength of the wave is 50 Å. Therefore, it is a X-ray.
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Question 131 Mark
A wave has a wavelength of $10^{-3} nm$. State its one property different from light.
Answer
Gamma rays have strong penetrating power.
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Question 141 Mark
A wave has a wavelength of $10^{-3} nm$. Name the wave.
Answer
Gamma ray has a wavelength of $10^{-3} $nm.
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Question 151 Mark
Ultraviolet bulbs have a quartz envelope instead of glass
Answer
Ultraviolet bulbs have a quartz envelope instead of glass as they are not absorbed by quartz, whereas ordinary glass absorbs the ultraviolet light.
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Question 161 Mark
A quartz is required for obtaining the spectrum of the ultraviolet light.
Answer
A quartz prism is used to obtain the spectrum of the ultraviolet radiations as they are not absorbed by quartz, whereas ordinary glass absorbs the ultraviolet light.
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Question 171 Mark
A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.
Answer
Infrared spectrum can be obtained only with the help of a rock-salt prism since the rock-salt prism does not absorb infrared radiations whereas a glass prism absorbs them.
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Question 181 Mark
The photographic darkrooms are provided with infrared lamps.
Answer
Infrared lamps are used in dark rooms for developing photographs since they do not affect the photographic film chemically, but they provide some visibility.
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Question 191 Mark
Infrared radiations are used as signals during war
Answer
Infrared radiations are used as signals during the war as they are not visible and they are not absorbed much in the medium.
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Question 201 Mark
Infrared radiations are used for photography in fog.
Answer
Infrared radiations are used in photography in fog because they are not much scattered by the atmosphere, so they can penetrate appreciably through it.
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Question 211 Mark
State one harmful effect each of the ultraviolet and infrared radiation.
Answer

Ultraviolet radiation: It causes health hazards like skin cancer.

Infrared radiation: It causes skin burns.

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Question 221 Mark
Name the material prism required for obtaining the spectrum of infra red radiation.
Answer
Infrared radiations is obtained by passing radiations through a rock salt prism.
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Question 231 Mark
Name the material prism required for obtaining the spectrum of ultraviolet light.
Answer
Ultraviolet light is obtained by passing radiations through a quartz prism.
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Question 241 Mark
Give two such properties of infrared radiations which are not true for visible light.
Answer
(a) Infrared radiations are invisible.
(b) They do not affect the ordinary photographic film.
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Question 251 Mark
Give two properties of ultraviolet radiations which differ from the visible light.
Answer
(a) Ultraviolet radiations produce fluorescence on striking a zinc sulphide screen.
(b) They cause health hazards like cancer on the body.
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Question 261 Mark
Which radiation is used for satellite communication?
Answer
Microwave is used for satellite communication.
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Question 271 Mark
Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and micro waves?
Answer
Gamma rays, X-rays, infrared rays, micro waves, radio waves.
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Question 281 Mark
Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
(a) Name the two waves.
(b) Compare the speeds of these waves when they travel in vacuum.
Answer
(a) A- Gamma rays, B-infrared radiations
(b) Ratio of speeds of these waves in vacuum is 1:1 as all electromagnetic waves travel with the speed of light in vacuum.
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Question 301 Mark
Name the rays or waves produced by the changes in the nucleus of an atom .
Answer
Gamma rays are produced by the changes in the nucleus of an atom.
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Question 311 Mark
Name the rays or waves used for taking photographs in dark .
Answer
Infrared rays are used for taking photographs in dark.
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Question 341 Mark
Give one use of infrared radiations.
Answer
Infrared radiations are used in remote control of television and other gadgets.
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Question 351 Mark
Give one use of ultraviolet radiations .
Answer
Ultraviolet radiations are used for detecting the purity of gems, eggs, ghee etc.
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Question 371 Mark
Name the radiations of wavelength just Shorter than $4 \times 10^{-7} m$.
Answer
ultraviolet radiations are shorter than $4 \times 10^{-7} m$.
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Question 381 Mark
Name the radiations of wavelength just longer than $8 \times 10^{-7} m$.
Answer
Infrared radiations are longer than $8 \times 10^{-7} m$.
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Question 391 Mark
State the approximate range of wavelength associated with infrared rays.
Answer
Infrared radiations-wavelength range 8000 Å to 107 Å
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Question 401 Mark
State the approximate range of wavelength associated with the visible light .
Answer
Visible light-wavelength range 4000 Å to 8000 Å
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Question 411 Mark
State the approximate range of wavelength associated with the ultraviolet rays .
Answer
Ultraviolet rays-wavelength range 100 Å to 4000 Å
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Question 441 Mark
What do you understand by the invisible spectrum?
Answer
The part of spectrum beyond the red and the violet ends is called the invisible spectrum as our eyes do not respond to the spectrum beyond the red and the violet extremes.
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Question 451 Mark
Name the seven prominent colours of the white light spectrum in order of their increasing frequencies.
Answer
The seven colours in the order of increasing frequencies are red, orange, yellow, green, blue, indigo and violet.
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Question 461 Mark
Write the seven prominent colours present in white light spectrum in order of their increasing wavelength.
Answer

Seven prominent colours of the white light spectrum in order of their increasing frequencies:

Red, Orange, Yellow, Green, Blue, Indigo, Violet

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Question 471 Mark
The wavelengths of violet and red light are 4000 Å respectively. Which of the two has the higher frequency ?
Answer
violet light of wavelength 4000 Å.
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Question 481 Mark
Write the approximate wavelengths for (i) blue and (ii) red light.
Answer

(i) For blue light, approximate wavelength=4800 Å

(ii) For red light, approximate wavelength=8000 Å

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Question 491 Mark
What is the range of wavelength of the spectrum of white light in (i) Å, (ii) nm?
Answer
(i) 4000 Å to 8000 Å

(ii) 400 nm to 800 nm

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Question 501 Mark
Name the subjective property of light related to its wavelength.
Answer
(i) For blue light, approximate wavelength=4800 Å
(ii) For red light, approximate wavelength=8000 Å
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[1 Mark Question Answer] - Physics STD 10 Questions - Vidyadip