Class 10 Science Chapter 11 MCQ with Answers for 2020-2021
| Class: 10 | Science |
| Chapter: 11 | Human Eye and Colourful World |
| Contents: | MCQ Online Tests with Explanation and Answers |
Class 10 Science Chapter 11 MCQ Online Test for 2020-21
Class 10 Science Chapter 11 MCQ Online tests with solutions and explanation are given below. All the questions are important for exams. After completing Chapter 11 from NCERT Textbook, these questions are helpful for the preparation of exams in less time.
Q1
Student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters are written in his textbook. Which of the following statements is correct?
[A]. The near point of his eyes has receded away.
[B]. The near point of his eyes has come closer to him
[C]. The far point of his eyes has come closer to him
[D]. The far point of his eyes has receded away
Answer: Option A
Explanation:The student sitting on the last bench can read the letters written on the blackboard but is not able to read the letters written in his book because he is suffering from hypermetropia or farsightedness. He can see distant objects clearly but cannot see nearby objects distinctly.
Note: Hypermetropia may have blurred vision to a person when looking at objects close to them and clearer vision when looking at objects in the distance.
Q2
Which of the following phenomena of light are involved in the formation of a rainbow?
[A]. Reflection, refraction and dispersion.
[B]. Refraction, dispersion and total internal reflection.
[C]. Refraction, dispersion and internal reflection
[D]. Dispersion, scattering and total internal reflection
Answer: Option C
Explanation:Rainbow is caused by dispersion, refraction and internal reflection of sunlight by tiny water droplets, present in the atmosphere and always formed in a direction opposite to that of the sun. The water droplets act like a small prism. They refract and disperse the incident sunlight, then reflect it internally and finally refract it again when it comes out of the raindrop.
Q3
The clear sky appears blue because:
[A]. Blue light gets absorbed in the atmosphere
[B]. Ultraviolet radiations are absorbed in the atmosphere
[C]. Violet and blue lights get scattered more than lights of all other colours by the atmosphere
[D]. Light of all other colours is scattered more than the violet and blue colour lights by the atmosphere.
Answer: Option C
Explanation:The clear sky appears blue is due to Rayleigh scattering of sunlight. The molecules in the air scatter blue light from the sun more than they scatter red light.
Q4
A person cannot see distinctly objects keep beyond 2 metre. This defect can be corrected by using a lens of power:
[A]. + 0.5 D
[B]. – 0.5 D
[C]. + 0.2 D
[D]. – 0.2 D
Answer: Option B
Explanation:As the person has the eye defect, myopia, therefore, a concave lens has to be used whose focal length will be,
f = – 2 m (using sign convention). Thus,
Power, P = 1/f (where, f is focal length in metre) = 1/- 2 = -0.5 D
Q5
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
[A]. Presbyopia is that defect of vision due to which an old person cannot see the nearby objects clearly due to loss of power of accommodation of the eye.
[B]. The near point of the old person having presbyopia gradually recedes and becomes much more than 25 cm away.
[C]. Presbyopia defect is corrected in the same way as hypermetropia by using spectacles having convex lenses.
[D]. All the above.
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q6
Hanshika is writing some important points about the “donation of eyes”. Choose the incorrect statement:
[A]. People who wear spectacles or have undergone cataract operation scan also donate Eyes.
[B]. The doctors of the eye bank team remove the eyes at the home of the dead person or at the hospital and it takes 10-15 minutes.
[C]. Those donated eyes which are not suitable for transplantation are used for doing research and for teaching purposes in medical colleges.
[D]. None of the above.
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q7
A man driving a car can read a distant road sign clearly but finds difficulty in reading the odometer on the dashboard of the car. Which of the following statement is correct about this man?
[A]. The near point of his eyes has receded away.
[B]. The near point of his eyes has come closer to him.
[C]. The far point of his eyes has receded away.
[D]. The far point of his eyes has come closer to him.
Answer: Option A
Explanation:If a man driving a car can see a distant road sign distinctly but cannot read the odometer on the dashboard of the car clearly, it suggests that the near point of his eyes has receded.
Q8
Which of the following statements is correct?
[A]. A person with myopia can see distant objects clearly
[B]. A person with hypermetropia can see nearby objects clearly
[C]. A person with myopia can see nearby objects clearly
[D]. A person with hypermetropia cannot see distant objects clearly
Answer: Option C
Explanation:A person with myopia can see nearby objects clearly. While a person with hypermetropia can see distant objects clearly.
Q9
The human eye possesses the power of accommodation. This is the power to:
[A]. Alter the diameter of the pupil as the intensity of light changes
[B]. Distinguish between lights of different colours
[C]. Focus on objects at different distances
[D]. Decide which of the two objects is closer.
Answer: Option C
Explanation:The human eye possesses the power of accommodation to focus on objects at different distances.
Q10
Having two eyes gives a person:
[A]. Deeper field of view
[B]. Coloured field of view
[C]. Rear field of view
[D]. Wider field of view
Answer: Option D
Explanation:Having two eyes gives a person a wider field of view.
What is the function of Iris?
Iris is a dark muscular diaphragm that controls the size of the pupil.
What is meant by accommodation of eye?
The ability of the eye lens to adjust its focal length is called accommodation.
Why do stars twinkle?
The twinkling of a star is due to atmospheric refraction of starlight. The starlight, on entering the earth’s atmosphere, undergoes refraction continuously before it reaches the earth.This makes continuously change in star’s position and we see the twinkling of stars.
Why does sky apear blue in colour?
The molecules of air and other fine particles in the atmosphere have size smaller than the wavelength of visible light. These are more effective in scattering light of shorter wavelengths at the blue end than light of longer wavelengths at the red end. When sunlight passes through the atmosphere, the fine particles in air scatter the blue colour (shorter wavelengths) more strongly than red. The scattered blue light enters our eyes and we see blue sky.
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