Q. 116. Accumulation of non-biodegradable pesticides in different trophic levels is called:
(A) Biological concentration
(B) Biological deposition
(C) Biological degradation
(D) Biological magnification
Answer:
(D) Biological magnification
Explanation:
Biomagnification (biological magnification) is the process by which the concentration of toxic substances, like pesticides, increases in organisms at each successive level of the food chain.
Q. 117. World Environment Day is celebrated on:
(A) July 1
(B) June 1
(C) May 5
(D) June 5
Answer:
(D) June 5
Explanation:
The United Nations designated June 5th as World Environment Day to raise global awareness and action for the protection of our environment.
Q. 118. Nature of the image formed by a convex mirror of an object positioned at infinity is:
(A) Real inverted diminished
(B) Real inverted enlarged
(C) Virtual, erect, diminished
(D) Virtual, erect, enlarged
Answer:
(C) Virtual, erect, diminished
Explanation:
A convex mirror always forms a virtual, erect, and highly diminished image at the principal focus behind the mirror when the object is placed at infinity.
Q. 119. Convex lens of appropriate power is used in the case of:
(A) Astigmatism
(B) Myopia
(C) Hypermetropia
(D) Presbyopia
Answer:
(C) Hypermetropia
Explanation:
Hypermetropia (farsightedness) is corrected using a convex (converging) lens of appropriate power, which helps focus the image correctly onto the retina.
Q. 120. Which is not true regarding electric charge?
(A) Electric charge is scalar quantity
(B) Charge on a body may be positive or negative
(C) S.I. Unit of the charge is Coulomb
(D) One electron has a charge of one coulomb
Answer:
(D) One electron has a charge of one coulomb
Explanation:
This statement is false because one electron possesses an extremely small elementary charge of approximately Coulombs, not one full Coulomb.
