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If A = {x: x is a natural number}, B ={x: x is an even natural number} C = {x: x is an odd natural number} and D = {x: x is a prime number}, find
A = {x: x is a natural number} = {1, 2, 3, 4, 5 …} B ={x: x is an even natural number} = {2, 4, 6, 8 …} C = {x:...
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The atomic number of an element is 5 and mass number is 11. Find the number of electrons, protons and neutrons present in an atom of it.
Number of electrons (Z = 5) = 5 Number of protons (Z = 5) = 5 Number of neutrons (A = Z) = 11 – 5 = 6 Since the atomic number is...
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Endoskeleton of fishes are made up of cartilage and bone; classify the following fishes as cartilagenous or bony
Torpedo—Cartilagenous, Sting ray—Cartilagenous, Dog fish— Cartilagenous, Rohu—Bony, Angler fish— Cartilagenous Exocoetus—bony.
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Classify the following based on number of chambers in their heart. Rohu, Scoliodon, Frog, Salamander,
Rohu, Scoliodon — 2 chambered. Frog, Salamander, Flying lizard, King Cobra —3 chambered. Crocodile, Ostrich, Pigeon, Bat, Whale —4 chambered.
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Shobo’s mother’s present age is six times Shobo’s present age. Shobo’s age five years from now will be one third of his mother’s present age.
At present, _________ Shobo's age = x years His mother's age = 6 times of Shobo's age = 6x years Five years from now ________________ Shobo's age = ( x + 5 ) years According to the problem given, x...
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The number of chambers in a human heart is
(A) Four The human heart has four chambers, two superior atria and two inferior ventricles. The atria are the receiving chambers and the ventricles are the discharging chambers.
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The number of malarial patients in a village increased tremendously when large number of frogs were exported from the village.
The food chain in the given situation will be: Phytoplankton ----> Zooplankton ---> Mosquito larva ------> Frogs In the absence of frogs (as they were exported), more mosquito larvae survived giving rise...
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Earthworms and frogs breathe through their skin because of which the skin of both the organisms is
(d) moist and slimy.
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Select the correct route for the passage of sperms in male frogs:
The correct answer is (3) In male frog the sperms passage is: Testes → Vasa efferentia → Kidney → Bidder’s canal → Urinogenital duct → Cloaca.
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Seema’s present age is four times her son’s present age and four-seventh of her father’s present age.
(b) Let Seema’s present age be x years. Then, Seema’s son’s present age = x/4 years Seema’s father’s present age = 7x/4 years. Then, x+ x/4 +7x/4= 32x3 12x = 96 × 4 x = 96...
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