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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
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Q. 4156
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Which part of human eye has the maximum refractive index?
Refraction is the change in direction of light rays as they transition between different mediums. A figure of 1.376 is often quoted for the refractive index of the human cornea over the visible spectrum.
Q. 4153
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Which of the following is an aquatic fern?
Salvinia, a genus in the family Salviniaceae, is a floating aquatics with creeping stems, branched, bearing hairs on the leaf surface papillae but no true roots, named in honor of Anton Maria Salvini, Italian scientist.
Q. 4149
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Which of the following is chiefly present in LPG?
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Q. 4146
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Bronze is an alloy of:
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Q. 4129
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Yeast are most likely to grow in frozen fruits during:
Slow thawing is the gradual process of allowing a frozen item to return to its natural state by exposing it to a controlled temperature environment. This method is often preferred over rapid thawing to maintain the quality, safety, and integrity of the food.
Q. 4128
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Which of the following does not have red blood cells?
Correct answer: D (Earthworm)
- Key concept: Earthworms have an open circulatory system with hemolymph that does not contain red blood cells (RBCs).
- Why: Invertebrates like earthworms use hemolymph for transport; RBCs are characteristic of vertebrates.
- Other options: Snakes (vertebrates) have RBCs; peacocks (birds) have RBCs; frogs (amphibians) have RBCs.
- Note: RBCs carry oxygen via hemoglobin; earthworms use dissolved oxygen in hemolymph.
- Exam tip: Remember “vertebrates have RBCs; many invertebrates do not.”
Q. 4127
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"The theory of Evolution" was developed by:
Correct option: C
- Correct answer text: Darwin
- Reason: The theory of Evolution was proposed by Charles Darwin, centered on natural selection driving gradual changes in species over time.
- Key concept: Natural selection: variation exists, those better suited survive and reproduce more, passing traits to offspring.
- Why others are wrong: Newton—gravity/physics; Mendel—principles of inheritance (gene patterns); Einstein—relativity.
- Exam tip: Link “Darwin” with evolution and natural selection; remember Darwin’s voyage on the Beagle.
Q. 4066
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A large collection of files are called:
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Q. 4046
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Bluetooth is a technology in communication which features
Bluetooth is a wireless technology using radio frequencies to share data over a short distance.
Q. 4042
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"Zoonosis" refers to any disease or infection that is naturally transmissible from:
(i) human to human
(ii) animal to human
(iii) animal to animals
(iv) bird to animal
Select the correct answer using the codes given below.
(i) human to human
(ii) animal to human
(iii) animal to animals
(iv) bird to animal
Select the correct answer using the codes given below.
A zoonosis is an infectious disease that has jumped from a non-human animal to humans.
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