InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Choose from the following : `""_(20)Ca,""_(3)Li, ""_(11)Na, ""_(10)Ne` (i) An element having two shells completely filled with electrons. (ii) Two elements belonging to the same group in the periodic table. |
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Answer» (i) The element is `""_(10)Ne , 2, 8` (ii) The elements are `""_(3)Li,and""_(11)Na" , "Li(2,1)" , "Na(2,8,1).` |
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| 2. |
Which among the following elements has the largest atomic radii ?A. NaB. MgC. KD. Ca |
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Answer» Correct Answer - C The element potassium (K) present in group 1 has the largest atomic radius. |
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| 3. |
Which element has (a) two shells, both of which are completely filled with electrons?(b) the electronic configuration 2, 8, 2? (c) a total of three shells, with four electrons in its valence shell? (d) a total of two shells, with three electrons in its valence shell?(e) twice as many electrons in its second shell as in its first shell? |
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Answer» (a) Neon (b) Magnesium (c ) Silicon (d) Boron (e ) Carbon |
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| 4. |
Which of the following elements would lose an electron easily ?A. MgB. NaC. KD. Ca |
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Answer» Correct Answer - C The element potassium (K) with maximum size would lose electron easily. |
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| 5. |
Which of the following elements does not lose an electron easily ?A. NaB. FC. MgD. Al |
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Answer» Correct Answer - B The element fluorine (F) with smallest size does not lose electron easily. |
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| 6. |
An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.) N(7) F(9) P(15) Ar(18) |
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Answer» (a) The atomic number of this elements is 17 (b) It would be chemically similar to F(9) with configuration as 2,7. |
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| 7. |
An element has electronic configuration 2, 8, 3. What is the atomic number of the element ? To which (i) group and (ii) period does this element belong ? |
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Answer» Atomic number of the element (Z) = 2 + 8 + 3 = 13 (i) The element belongs to group =13 (ii) The element belongs to period = 3. |
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| 8. |
Name the members of alkaline earth family. Which out of them is radioactive in nature ? |
| Answer» The members of alkaline earth family (group 2) are : Be, Mg, Ca, Sr, Ba, Ra. The last element radium (Ra) is radioactive in nature. | |
| 9. |
Arrange giving reason the following elements in increasing order of their atomic size : (a) Be, O, F (Given that they beiong to 2nd, 16th and 17th groups respectively and to 2nd period). (b) I, CI, F (Given that they belong to 5th, 3rd and 2nd periods respectively of 17th group). (c) Mg, N, P (Given that Mg and P belong to `2^(nd)" and "15^(th)` group respectively of `3^(rd)` period and N belongs to `15^(th)" group of "2^(nd)` period). |
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Answer» (a) All these elements are present in the `2^(nd)` period but in different group. The increasing order of their atomic radius is : `FltOltBe.` (b) These elements are present in the same group but in different periods. Since the atomic size increases down the group `(2^(nd) , 3^(rd)" and "5^(th) "periods")` the increasing order of atomic radius is : `FltClltI` (c) On similar line, the increasing order of atomic radius is : `NltPltMg.` For more clarification, please consult Long Form of Periodic Table. |
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| 10. |
Shailesh lies in a bigh industrial city having a large number of chemical industries onits outskirts. This city has also a very heavy traffic density. There is a big lake in the middle of this city which has much less water left init but the lake has still a large number of fish in it. During the last one and a half months, there ha been to much rain in the city with the pH of rain water being about 5.5. One day people found that many fish in the lake ha died. No one knew the reason for the death of fish in the lake or how the death of remaining fish in the lake could be prevented. Shailesh, who is a student of class X could understand the reason for the death of fish in lake. He also suggested an immediate solutioin for the prevention of death of more fish in the lake water. (a) What conclusion do you draw the fact that the rain water has a pH of about 5.5? What name is given to such a rain? (b) What makes the pH of rain water to be about 5.5? (c) What happens to lake water when too much rain water haivng pH of 5.5 collects in it? (d) Why have the fish died after the heavy rains? (e) Why suggestion do you think has been made by Shailesh to prevent the death of more fish in the lake? Why (f) What values are displayed by Shailesh in this episode? |
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Answer» (a) The rain water having a pH of about 5.5 is acidic in nature. Such a rain is called acid rain. (b) The chemical inductrias and heavy traffic (vehicles) in this city emit many harmful gases into the air and pollute it. The acidic gases (such as sulphur dioxide and nitrogen oxides) present in polluted air dissolve in rain water to produce acids. The presence of the acids lowers the pH of rain water to about 5.5 (making it quite acidic in nature). (c) Too much acid rain can lower the pH of lake water appreciably and make it highly acidic. (d) The high acidity of lake water caused by too much acid rains has caused the death of fish in the lake. (e) Shailesh might have suggeted adding calcium carbonate to the lake water. This is because calcium carbonate neutralises the excess cid present in lake water (which comes from acid rain), reducing the acidity of lake water. This reduction in the acidity of lake water can prevent the death of more fish in the lake. (f) The various values displayed by Shailesh in this episode are (i) Awareness (or knowledge) of the occurrence of acid rain and its harmful effects on aquatic animals such as fish (ii) Understanding of neturalisation reaction involving acidic and basic susbtances and (iii) Concern to save the life of remaining fish in the lake. |
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| 11. |
Name three elements which behave as metalloids. |
| Answer» The elements are : arsenic (As), antimony (Sb) and germanium (Ge). | |
| 12. |
Calassify the following elements as metals, nonmetals or metalloids, (a) Sn (b) Br, (c) Mo , (d) Cd, ( e) Si and (f) Xe. |
| Answer» (a) metal (b) nometal, (c) metal, (d) metal, (e ) metalloid (f) nonmetal. | |
| 13. |
The animals belong to Porifera bear numerous pores on their body called ……………. |
| Answer» Correct Answer - ostia | |
| 14. |
Greek philosopher .................. classified animals for the first time |
| Answer» Correct Answer - Aristotle | |
| 15. |
Element X forms a chloride with the formula `XCl_(2)`, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table asA. NaB. MgC. AID. Si |
| Answer» Correct Answer - (c ) Mg | |
| 16. |
Element `X` forms a chloride with the formula `XCl_(2)`, which is a solid with a high melting point. `X` would most likely be in the same group of the periodic table as: (a) `Na` (b) `Mg` (c) `Al` (d) `Si` |
| Answer» (b) The formula of the chloride of the element is `XCl_(2).` This means that the valency of the element X is 2 since chlorine is monovalent. The element with valency 2 is expected to be present in group 2 to which magnesium (Mg) belongs. | |
| 17. |
Arthropods are hermaphrodites. |
| Answer» False. Arthropods are unisexual | |
| 18. |
Birds (Aves) are adpated to aerial mode of life |
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Answer» (i) Birds have spindle shaped body which lowers the air resistance during flight. (ii) The body is covered with light feathers. (iii) The bones are hollow, mouth is modified into light beak. (iv) Forelimbs are modified into wings for flying in air. (v) There are air sacs which help in flight by increasing the buoyancy. (vi) Hence, birds are adapted to aerial mode of life. |
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| 19. |
What are Platyhelminthes? |
| Answer» The animals which are slender, flat like a leaf or strip are called Platyhelminthes. | |
| 20. |
Platyhelminthes are hermaphrodites. |
| Answer» Correct Answer - 1 | |
| 21. |
The human body is bilaterally symmetrical |
| Answer» Correct Answer - 1 | |
| 22. |
Octopus can change its body colour. |
| Answer» Correct Answer - 1 | |
| 23. |
Animals with true body cavity are called acoelomates. |
| Answer» False. Animals with true body cavity are called eucoelomates. | |
| 24. |
Earthworm belongs to phylum Aschelminthes. |
| Answer» False. Earthworm belongs to phylum Annelida. | |
| 25. |
All higher animals show ……………..organization. |
| Answer» organ system grade | |
| 26. |
Body cavity is absent in ……………. |
| Answer» Correct Answer - Porifera | |
| 27. |
In Aschelminthes, the body cavity is not formed by mesoderm. So, they are called as …………… |
| Answer» Pseudocoelomates | |
| 28. |
The cavity between the body and internal organs is called .............. |
| Answer» Correct Answer - Coelom | |
| 29. |
The animals which do not possess body cavity are called _____A. AcoelomateB. CoelomateC. PseudocoelomateD. Eucoelomate |
| Answer» Correct Answer - Acoelomate | |
| 30. |
Segmented body |
| Answer» If a body of an animal is divided into small, similar units, then such a body is called segmented body and each units is called segment. | |
| 31. |
Sedentary animals |
| Answer» The animals which are attached to substratum and do not show locomotion are called sedentary animals. | |
| 32. |
Why are Poriferans called sedentary animals? |
| Answer» (i)The animals belonging to Porifera are always attached to substratum, and hence do not show locomotion. (ii) Therefore, they are referred as sedentary animals. | |
| 33. |
Poriferans are called sedentary animals. |
| Answer» (i)The animals belonging to Porifera are always attached to substratum, and hence do not show locomotion. (ii) Therefore, they are referred as sedentary animals. | |
| 34. |
If the body cavity is absent, the animal is called …………….. |
| Answer» Correct Answer - acoelomate | |
| 35. |
A precious stone called coral is derived from coral reef. |
| Answer» Correct Answer - 1 | |
| 36. |
Ascaris is unisexual. |
| Answer» Correct Answer - 1 | |
| 37. |
Euspongia is a sedentary animal. |
| Answer» Correct Answer - 1 | |
| 38. |
I am a mammal who lives in deep oceans. |
| Answer» Correct Answer - Whale | |
| 39. |
Sycon, Euspongia, Adamsia, Euplectella |
| Answer» Adamsia - Others belong to Phylum Porifera whereas Adamsia belongs to Coelenterata. | |
| 40. |
Sea anemone, Hydra, Aurelia, Ascaris |
| Answer» Ascaris - Others are coelenterates whereas Ascaris belongs to phylum Aschelminthes. | |
| 41. |
Hydra, Sea anemone, Sycon, Coral |
| Answer» Sycon - Others are Coelenterates whereas Sycon belongs to Porifera. | |
| 42. |
Diploblastic animals |
| Answer» The multicellular animals which have two germ layers, namely ectoderm and endoderm that are formed during initial period of their embryonic development, are called diploblastic animals. | |
| 43. |
I am diploblastic and acoelomate. Which phylum do I belong to? |
| Answer» Coelenterata (cnidaria) | |
| 44. |
Dog fish, Shark, Rohu, Salamander. |
| Answer» Salamander - Others belong to class pisces whereas Salamander belongs to class Amphibia. | |
| 45. |
Salamander : Amphibia :: Balanoglossus : ____ |
| Answer» Hemichordata - Salamander belongs to phylum Amphibia whereas Balanoglossus belongs to phylum Hemichordata. | |
| 46. |
Sea anemone : Diploblastic : : Planaria : ____ |
| Answer» Triploblastic - The body of sea anemone is made of two germ layers hence called Diploblastic whereas the body of Planaria is made of three germ layers, hence called Triploblastic. | |
| 47. |
Starfish: Tube feet: : Euglena : __ |
| Answer» Flagellum - The locomotory organ of Starfish is tube feet whereas that of Euglena is Flagellum. | |
| 48. |
Jellyfish, Starfish, Sea-urchin, Planaria. |
| Answer» Planaria - Others show radial symmetry whereas Planaria shows bilateral symmetry. | |
| 49. |
Starfish : Echinodermata :: Balanoglossus : ____ |
| Answer» Hemichordata - Starfish belongs to phylum Echinodermata whereas Balanoglossus belongs to phylum Hemichordata. | |
| 50. |
Write the characteristics of following animals with reference to their classification: Jelly fish |
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Answer» (i) Jelly fish belongs to Phylum Coelenterata. (ii) Cnidoblast bearing tentacles are present around the mouth. Tentacles are useful for capturing the prey whereas cnidoblasts inject the toxin in the body of the prey. (iii) Body is umbrella shaped, hence called Medusa. (iv) It is diploblastic, and shows radial symmetry. |
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