Science and Environment Quiz: Day 66

January 16, 2023

You can see your image in polished floors, but not in wooden table because

(A) Regular reflection takes place in wooden table and irregular reflection in polished floor
(B) Regular reflection takes place in polished floor and irregular reflection in wooden table
(C) Regular reflection takes place in both polished floor and wooden table
(D) Irregular reflection takes place in both polished floor and wooden table

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Answer : B

Consider the following statement :
1. The image of right hand in a plane mirror looks like a left hand.
2. Rainbow is formed by dispersion of which light by water drops
3. The image formed by the plane mirror is laterally inverted, hence the image seen through the periscope is also laterally inverted
Which of the statement is/are correct:

(A) Only 1 and 2
(B) Only 2 and 3
(C) Only 1 and 3
(D) None of the these

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Answer : A

Consider the following statement :
1. The angle of deviation depends on the refractive index of the glass.
2. The convex mirror always produces a virtual, diminished and erect image of the object
Which of the statement is/are correct:

(A) Only 1
(B) Only 2
(C) Both 1 and 2
(D) Neither 1 nor 2

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Answer : C

The spherical mirror used as a rear view mirror in the vehicle is

(A) Concave mirror
(B) Convex mirror
(C) Plane mirror
(D) None of the above

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Answer : B

The phenomenon of mirage occurs due to which one of the following?

(A) Polarisation of light
(B) Dispersion of light
(C) Diffraction of light
(D) Total internal reflection of light

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Answer : D

Consider the following statement:
1. Velocity of light is greater in denser medium than in rarer medium
2. The power of lens depends on the focal length of the lens
3. Increase in the converging power of eye lens cause ‘hypermetropia
Which of the statement is/are correct:

(A) Only 1 and 2
(B) Only 2
(C) Only 1 and 3
(D) All of the these

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Answer : B

Assertion: Myopia is due to the increase in the converging power of eye lens.
Reason: Myopia can be corrected with the help of concave lens.

(A) If both assertion and reason are true and reason is the correct explanation of assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If assertion is false but reason is true.

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Answer : B

Myopia, also known as short sightedness, occurs due to the lengthening of eye ball. With this defect, nearby objects can be seen clearly but distant objects cannot be seen clearly. The focal length of eye lens is reduced or the distance between eye lens and retina increases.

In myopia, the eye lens becomes too convex i.e. it’s converging power increases. It is because of more convergence produced by the eye lens that the rays start meeting before retina. Therefore, to decrease convergence a diverging lens called concave lens of appropriate power is used so that rays meet on the retina for the formation of image.

A convex lens forms a real, diminished point sized image at focus. Then the position of the object is at

(A) Focus
(B) Infinity
(C) At 2f
(D) Between f and 2f

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Answer : B

Assertion: For observing the traffic at a hairpin bend in mountain paths a plane mirror is preferred over convex mirror and concave mirror.
Reason: A convex mirror has a much larger field of view than a plane mirror or a concave mirror.

(A) If both assertion and reason are true and reason is the correct explanation of assertion.
(B) If both assertion and reason are true but reason is not the correct explanation of assertion.
(C) If assertion is true but reason is false.
(D) If assertion is false but reason is true.

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Answer : D

Which of the following lens would you prefer to use while reading small letters found in a dictionary?

(A) A convex lens of focal length 5 cm
(B) A concave lens of focal length 5 cm
(C) A convex lens of focal length 10 cm
(D) A concave lens of focal length 10 cm

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Answer : A

The role of Bacteria in carbon cycle is

(A) Stabilisation of CO₂ by chemosynthesis
(B) Stabilisation of CO2 by photosynthesis
(C) Decomposition or degradation of dead organic matter
(D) All of the above

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Answer : D

Consider the following statements:
1. Organisms which turn parasitic when they get an opportunity are called Facultative parasite.
2. Association of two organisms which depend upon each other is called matualism.
Code:

(A) Both 1 and 2 are correct
(B) Both 1 and 2 are incorrect
(C) Only 1 is correct
(D) Only 2 is correct

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Answer: A

Choose the Incorrect Statement about Eutrophication

(A) Eutrophication is the enrichment of surface waters with plant nutrients.
(B) Eutrophication can leads to algal blooming, deoxygenation of water and ultimately fish killed.
(C) Eutrophicated water is oxygen rich and safe for direct human consumption without requiring any treatment.
(D) None of above

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Answer :C

Agricultural activities produce Green house Gases, which of the following are the gases that are produced:

(A) CO2, NO2 & CH4.
(B) NO2 & CH4 only.
(C) CO2 & CH4 only.
(D) CH4 only.

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Answer : A

According to Western Ghats Ecological Expert Panel. report-Ecologically Sensitive Areas are:
1. Ecologically important.
2. Economically important.
3. Vulnerable to even mild disturbances.

(A) 1 only.
(B) 1 & 3 only.
(C) 3 only.
(D) 1, 2 & 3.

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Answer : D