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.
| 101. |
Lizard, Snake, Penguin, Python. |
| Answer» Penguin - Others belong to Reptilia whereas Penguin belongs to mammals. | |
| 102. |
Kangaroo, Kiwi, Penguin, Peacock |
| Answer» Kangaroo - Other are Aves whereas Kangaroo belongs to mammals. | |
| 103. |
Digestive system is feebly developed m endoparasites. |
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Answer» (i) Endoparasites reside in the digestive tract of the host animal. (ii) Thus, they suck readymade digested food from the host body, which needs no further digestion. (iii) As there is no need for food to digest, their digestive system is feebly developed. |
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| 104. |
What was the basis of natural system of classification? |
| Answer» The natural system of classification was based on various criteria like body organization, types of cells, chromosomes, bio-chemical properties, etc. | |
| 105. |
Who was the first to classify animals? |
| Answer» Aristotle was the first philosopher to classify animals | |
| 106. |
The first man to classify animals was Aristotle |
| Answer» Correct Answer - 1 | |
| 107. |
Earthworm : Annelida :: Millipede : __ |
| Answer» Arthropoda - Earthworm belongs to phylum Annelida whereas millipede belongs to phylum Arthropoda. | |
| 108. |
Which is the main respiratory organ for amphibians? |
| Answer» The skin is the main respiratory organ present in amphibians. | |
| 109. |
Amphibians |
| Answer» The animals which can live in water as well as on land are called amphibians | |
| 110. |
Which of the following is the most nonmetallic element ?A. BrB. ClC. PD. S |
| Answer» Correct Answer - A | |
| 111. |
Atomic number, not atomic mass, is a more fundamental proterty of an element. This was enunciated byA. Lothar meyerB. MoseleyC. MendeleevD. Bohr |
| Answer» Correct Answer - B | |
| 112. |
From left to right in a period, the acidic nature of the oxides of elementsA. decreasesB. increasesC. does not changeD. changes irregularly |
| Answer» Correct Answer - B | |
| 113. |
The electronic configuration of an element is 2, 8, 6. Identify the element and name of the family to which it belongs. |
| Answer» The element with configuration 2, 8, 6 (Z= 16) is sulphur. It belongs to oxygen family (group 16). | |
| 114. |
If the body of a coelenterata is cylindrical, it is called …………. |
| Answer» Correct Answer - Polyp | |
| 115. |
(a) The elements of the second period along with their atomic numbers in parentheses are given below : B (5), Be (4), O(8), N(7), Li (3), C (6), F (9) (i) Arrange them in the same order as they appear in the periodic table. (ii) Which element has the largest and smallest atom ? (b) Why does atomic radius change as we move from left to right in a period ? |
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Answer» (a) (i) Li (3), Be (4), B (5), C (6), N (7), O(8), F (9) (ii) The element Li has the largest atom. The element F has the smallest atom. ltbnrgt (b) Along a period, the nuclear charge increases and the electrons are attracted more towards the nucleus. Therefore, the atomic size or atomic radius decreases as we move from left to the right along a period. |
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| 116. |
Give the characteristics of the following with examples : Class Pisces |
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Answer» (i) They are cold blooded (Poikilotherms) aquatic animals living in marine and fresh waters. (ii) Body is spindle shaped to minimze water resistance. (iii) They have paired and unpaired fins for swimming. Tail fin is useful as a steering organ while swimming. (iv) Exoskeleton is in the form of scales and endoskeleton is either cartilagenous or bony. (v) Respiration is carried out with the help of gills. e.g. Rohu, Scoliodon, Pomfret, Sea horse, Electric ray, Sting ray, etc. |
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| 117. |
Warm blooded animals |
| Answer» The animals which can maintain their body temperature constant irrespective of surrounding temperature are called warm blooded animals or homeotherms | |
| 118. |
Reptiles are homeotherms (warm-blooded ) |
| Answer» False. Reptiles are Poikilotghems (Cold-blooded). | |
| 119. |
What are cold-blooded animals? |
| Answer» The animals whose body temperature changes with that of the surrounding temperature are called cold blooded or poikilothermic animals. | |
| 120. |
Name the different parts in which body of Arthropoda is divided. |
| Answer» The body of Arthropoda is divided into head, thorax and abdomen. | |
| 121. |
What are the parts of the body of Hemichordata? |
| Answer» The body of Hemichordates is divided into proboscis, collar and trunk. | |
| 122. |
The long rod like supporting structure present on the dorsal side of animal body is called ………… |
| Answer» Correct Answer - Notochord | |
| 123. |
Acoelomate, unicellular animal |
| Answer» Correct Answer - Amoeba | |
| 124. |
A student added sodium hydrogen carbonate solution in ethanoic acid taken in a test tube and the gas evolved was tested with a burning splinter. Write the chemical equation for the evolution of this gas and its effect on burning splinter. |
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Answer» `CH_(3)COOH+NaHCO_(3)rarrCH_(3)COONa+H_(2)O+CO_(2)` Since `CO_(2)` is not a supporter of combustion, the burning splinter will be extinguished. |
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| 125. |
Pigeon: Aves : : Bat : _____ |
| Answer» Mammalia - Pigeon belongs to class Aves whereas Bat belongs to phylum Mammalia. | |
| 126. |
I make pearl in my body. |
| Answer» Oyster, Bivalve | |
| 127. |
Earthworm, Crab, Mosquito, Spider. |
| Answer» Earthworm - Others belong to Arthropoda whereas earthworm belongs to Annelida. | |
| 128. |
Spider, Cockroach, Butterfly, Bivalve. |
| Answer» Bivalve - Others belong to Phylum Arthropoda whereas bivalve belongs to Mollusca. | |
| 129. |
Bat, Whale, Monkey, Ostrich. |
| Answer» Ostrich - Others are Mammals whereas ostrich belongs to class aves. | |
| 130. |
State the importance of animal classification |
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Answer» (i)Study of animals becomes convenient. (ii) Study of few animals from group helps to understand about the entire group. (iii) Classification gives an idea about evolution of animals. (iv) Animals can be easily identified with great accuracy. (v) It helps to understand various adaptations shown by them. (vi) It helps to understand the relationship of animals with other living organisms. (vii) It helps to understand the habitat of each animal and its exact role in nature. |
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| 131. |
My body is made up of fibres of a protein spongin |
| Answer» Correct Answer - Bath sponge | |
| 132. |
I am a clever molluscan, I can change my colour |
| Answer» Correct Answer - Octopus | |
| 133. |
Name the acid and base from which the following salts have been formed : (i) Sodium acetate (ii) Ammonium chloride (iii) Calcium nitrate (iv) Sodium carbonate. |
| Answer» (i) `NaOH" and "CH_(3)COOH` (ii) `NH_(4)OH" and "HCl` (iii) `Ca(OH)_(2)" and "HNO_(3)` (iv) `NaOH" and "H_(2)CO_(3)` | |
| 134. |
Calcium forms the following salts : Calcium oxide -CaO, Calcium hydroxide-`Ca(OH)_(2)` and Calcium sulphate-`CaSO_(4)` Barium belongs to same group. Write the formulae of its oxide, hydroxide and sulphate. |
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Answer» In all the compounds of calcium (Ca) listed, the valency of the metal is +2. Now, the element barium (Ba) belongs to the same group as calcium. It must be also divalent in its compounds. The formulae of the respective compounds of the element are : `underset(("Barium oxide"))(BaO)" "underset(("Barium hydroxide"))(Ba(OH)_(2))" "underset(("Barium sulphate"))(BaSO_(4))` |
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| 135. |
Which common property do all the elements present in the same group have as the element fluorine ? |
| Answer» All the elements have the same number of electrons (seven) in their valence shells. | |
| 136. |
Based on the group valency of elements state the formula for the following giving justification for each : (i) Oxides of 1st group elements, (ii) Halides of the elements of group 13, (iii) Compounds formed when an element of group 2 combines with an element of group 16. |
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Answer» (i) The valency of the group 1 elements is 1 and that of oxygen is 2. Therefore, the formula of the oxides of the elements is `E_(2)O.` (ii) The valency of group 13 elements is 3 and that of halogens is 1. Therefore, the formula of the chlorides of the elements is `EX_(3).` (iii) The valency of group 2 elements is 2 while that of the elements present in group 16 is also 2. The formula of the compound formed is `E_(2)O_(2)" or "EO` (oxygen is the first member of group 16). |
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| 137. |
The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table. (a) In which group of the periodic table should they be ? (b) Which one of them is least reactive ? (c) Which one of them has the largest atomic radius ? Give reason to justify your answer in each case. |
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Answer» (a) Since the elements have one valence electron, they are placed in group 1 (Alkali metals) in the order Li (period = 2) , Na (period = 3) , K (period = 4). (b) Since the reactivity of the elements increases down a group, the element Li is the least reactive chemically. (c) Since the atomic size increases down a group, the element K has the large atomic size or atomic radius out of these elements. |
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| 138. |
Name (a) three elements that have a single electron in their outermost shells.(b) two elements that have two electrons in their outermost shells.(c) three elements with filled outermost shells. |
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Answer» (a) Lithium, sodium, potassium (Alkali metals present in group 1) (b) Beryllium, magnesium, calcium (Alkaline earth metals present in group 2) (c) Helium, neon, argon (Noble gases present in group 18). |
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| 139. |
You are provided with two samples of hard water, one containing temporary hardness and the other permanent hardness. Without the help of any chemical, how will you identify the nature of the sample. |
| Answer» Boil the two samples separately in beakers for sometime. If precipitate appears, filter it out. Now, add a strip of soap in each. The one which produces lather contained temporary hardness while the other in which no lather is formed, contained permanent hardness. | |
| 140. |
Piyush is a student of class 10. His teacher was teaching the type of chemical reactions in the class. Piyush was aksed to carry out the reaction of electrolysis of water in the laboratory. Piyush set up the complete apparatus for the electrolysis of water. He took pure water (distilled water) to carry out this reaction. When Piyush passed electric current through this water for a considerable time even then no chemical reaction took place. Piyush told this problem to his classmate Arjun. Arjun thought over the problem and asked Piyush to add a little of a certain substance into pure water before passing electric current through it. When electric current was passed thorugh water after adding a little of this substance then a chemical reaction took place to form two gases `X` and `Y`. The volume of gas `X` collected over one of the electrodes was `8mL` whreas the volume of gas `Y` collected over the other electrode was `16mL` (a) Why no chemical reaction took place when electric current was passed thorugh pure water? (b) What substance was added in little quantity to pure water before passing electric current again? (c) How did the addition of little of this substance help in the electrolysis of water? (d) What is gas `X`? Over which electrode is it collected? (e) What is gas `Y`? Over which electrode is it collected? (f) What type of chemical reaction is demonstrated by this experiment ? Why? (g) What values are displayed by Arjun in this episode? |
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Answer» (a) because pure water (or distilled water) is a non conductor of electricity. (b) Sulphuric acid. (c) Sulphuric acid is an electrolyte. The addition of a little of sulphuric acid made water a good conductor of electricity. (The water containing a little of sulphuric acid is called acidified water). (d) The gas `X` is oxygen. It is collected over the positive electrode (called anode). (e) The gas `Y` is hydrogen. It is collected over the negative electrode (called cathode). (f) This experiment shows a decomposition reaction. In his decomposition reaction water decompose into two constituents : oxygen and hydrogen. (g) The values displayed by Arjun in this episode are: (i) Awareness (or knowledge) that pure water is a non-conductor of electricity which can be made a god conductor by adding a little of dilute sulphuric acid, and (ii) Helping nature. |
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| 141. |
In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters `a,b,c,d` and `e` (which are not their chemical symbols): (i) Select the letter which represents a halogen. (ii) Select the letter which represents a noble gas. (iii) What type of bond is formed between `a` and `b`? (iv) What type of bond is formed between `c` and `b`? (v) Which element will form a divalent anion? |
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Answer» (i) The halogens are placed in group 17. Now, in the above given table the element present in group 17 is b. Thus, the letter b represents a halogen. (ii) The noble gases are placed in group 18 of the periodic table. In the above given table, the element placed in group 18 is e. Thus, the letter e represents a noble gas. (iii) We have now to find the type of bond formed betwen the elements a and b. Now, if we look at the above given table, we find that element a is placed non-metal reacts with another non-metal, the covalent bonds are formed. So, the bond between a and b is covalent bond. (iv) And now we have to find out the type of bond between the elements c and b. The element c is in group 2 so it is a metal. The element b is in group 17 so it is a non metal. We know that when a metal reacts with a non -metal, then an ionic bond is formed. Thus, the bond formed between the elements c and b will be ionic bond. (v) We will now find out that element which forms a divalent anion. A divalent means a negative ion having 2 units of negative charge. A divalent anion is formed by a non-metal atom having 6 valence electrons (so that it can accept 2 more electrons to complete the octet and form a divalent anion). Thus a divalent anion will be formed by a non metal element of group 16 because it will have 6 valence electrons in its atom. Now, in the above given table, the elemented has been placed in group 16 of the periodic table, so element will form a divalent anion. |
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| 142. |
How will you distinguish between ethane and ethene with the help of a chemical test ? |
| Answer» Pass che two gases separately through bromine dissolved in carbon tetrachloride taken in two test tubes. If the yellow colour of bromine gets discharged, the gas is ethene. If the colour remains intact, then the gas is ethane. | |
| 143. |
In the table below, some of the elements of the periodic table with atomic numbers from 3 to 18 are given . These are represented by letters. Which are not the usual symblos of the elements. (a) which of these (i) is a noble gas (ii) is a halogen (iii) are alkali metals (iv) is an element with valency 4. (b) if A combines with F, what would be the formula of the resulting compound ? (c) what is the electronic arrangement of G ? |
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Answer» (a) (i) G is a noble gas. (ii) F is a halogen. (iii) A and B are alkali metals. (iv) D is an element with valency 4. (b) if A combines with F, the formula of the resulting compund wil be `A^(+)F^(-)` (c) The electronic arrangement of G is 2,9 |
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| 144. |
Raghav is a student of class `X` who was trying to convert the groundnut oil into solid fat (vanaspati ghee). He took the oil inan appropriate flask having an arrangement for passing hydrogen gas into it. Raghav pased the hydrogen gas into oil and heated them together for a considerable time. On cooling the apparatus, Raghav found that even after heating them together for a considerable time. On cooling the apparatus, Raghav found that even after heating together oil and hydrogen for a considerable time, no solid fat was formed. Raghav shard this problem with his sister Divya who is studyging in class XI. She advised him ot add a certain finely divided substance while heating oil wih hydrogen gas. When Raghav repeated the experiment by adding this substance to oil and hydrogen mixture, then the liquid oil was converted into a solid fat.Divya advised Raghav not to consume the fat prepared by him in the laboratory. (a) What was he finely divided substance which Raghav was asked to add for converting oil into fat? What is its function? (b) What type of substance is (i) an oil, and (ii) a fat? (c) What is the special name of conversion of oils into fats used in Industry? (d) What are the two types of chemical reactions exemplified by the conversion of oils into fats? (e) Why did Divya ask Raghav not to consume the fat prepared by him in the laboratory? (f) What values are exhibited by Divya in this episode? |
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Answer» (a) Raghav was asked to add finely divided nickel for converting oil into fat. Finely divided nickel acts as a catalyst in the reaction between oil and hydrogen. (b) (i) An oil an unsaturated organic compun. It is usually in liquid form at the room temperature. (ii)( A fat is a saturated organic compound. It is usually a solid (or semi-solid) at the room temperature. (c)Hydrogenation of oils. (d)(i) The conversion of oil into fat exemplifies a combination reaction (because in this reaction tow substances, oil and hydrogen, combine to form a single substance called fat). (ii) The conversion of oil into fat also exemplifies a reduction reaction (because addition of hydrogen to a substance is called reduction). (e) Divya asked Raghav not to consume the fat prepared by him in the laboratory because it containe dfiely divided nickel metal particles whihc were added as catalyst but could not be removed by Raghav.Thes nickel metal particles could damage his health. (f) The values exhibited by Divya in this episode are (i) Awareness (or knowledge) that hydrogenation of oils takes place in the presence of finely divided nickel as catalyst (ii) Helping nature, and (iii) Concern for the health of her brother. |
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| 145. |
An unknown organic liquid does not turn blue litmus red and gives no effervescence with sodium hydrogen carbonate. However, when a dry piece of sodium pellet is added to the liquid, a gas is evolved with brisk effervescence. Identify the liquid. |
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Answer» The given liquid is probably an alcohol (e.g. , ethyl alcohol) which has no reaction with blue litmus or sodium hydrogen carbonate. But it evolves hydrogen gas on reacting with sodium metal `underset("Ethanol")(2C_(2)H_(5)OH)+2Nararrunderset("Sod. ethaoxide")(2C_(2)H_(5)ONa)+underset("(effervesecnce)")(H_(2))` |
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| 146. |
Reshma is the student of class X in a city school. One day she was sitting in the school garden with her friends during the recess. There was a tall tree at the edge of the garden having a large honeycomb attached to it. Some students were playing cricket in te school playground. Suddenly the cricket ball hit the honeycomb due to which a large numbr of honey-bees started flying here and there. Reshma was stung on her face by a honey-bee. The sting was so painful that Reshma started crying. She was immediately rushed to the science laboratory. One of her classmates Shanta gave her vinegar solution to rub on the stung area to get relief from pain. Another clasmate Amarjit, howerver, asked Reshma to rub baking soda solution on the stung area of face. On rubbing baking soda solution, Reshma felt a lot of relief from pain. (a) What kind of liquid is injected into the skin when a honey-bee stings a person? (b) Why did rubbing baking soda solution on the stung area of skin give relief from pain? (c) What type of chemical reaction takes place when baking soda solution is rubbed on the honey-bee sting area? (d) Why do you think rubbing the honey-bee sting area with vinegar could not give relief from pain? (e) Name one plant whose stinging hair on leaves inject a similar liquid to that injected by honey-bee sting and can be treated by rubbing baking soda solution? (f) What vaues are displayed by Amarjit in this episode? |
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Answer» (a) Honey-bee sting injects an acidic liquid into the skin of a person. (b) Baking soda is a mild base. Being a base, baking soda solution neutralises the acidic liquid injected by honey-bee sting and cancels its effect. This give relief from pain. (c) Neutralisation reaction (between an acid and a base). (d) The honey-bee sting injects an acidic liquid into the skin of a person which means that the honey-bee sting contains an acid. Now, vinegar also contains an acid. So, vinegar itself being acidic, cannot neutralise the effect of acidic liquid injected by honey bee sting and hence could not provide any relief from pain. (e) Nettle plant. (f) The values displayed by Amarjit in this episode are (i) Awareness (of the acidic nature of honey-bee sting and basic nature of baking soda) (ii) Knowledge (that acids and bases are chemically oposite substances which can neutralise or cancel the effect of each other) and (iii) Desire to remove the suffering of others. |
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| 147. |
Give the characteristics of the following with examples : Sub phylum Vertebrata (Craniata) |
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Answer» (i) In these animals, the notochord is replaced by vertebral column. (ii) Head is well developed and brain is protected in the cranium. (iii) Endoskeleton is either cartilagenous or bony. (iv) Some chordates are jaw-less (Agnatha) whereas some are with jaws (Gnathostomata). |
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| 148. |
Give the characteristics of the following with examples : Class Cyclostomata |
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Answer» (i) These are marine animals having fish-like body with bilate ral symmetry. (ii) They have jaw-less mouth provided with sucker (suctorial mouth). (iii) Their skin is soft and without any scale. (iv) Paired appendages are absent. (v) Endoskeleton is cartilagenous. (vi) Most of the animals are ectoparasites. e.g. Petromyzon, Myxine, etc. |
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| 149. |
In amphibia, exoskeleton is in the form of scales |
| Answer» False. In amphibia, exoskeleton is absent. | |
| 150. |
Pharyngeal gill-slits are absent in ______A. Non-chordatesB. ChordatesC. VertebratesD. Craniates |
| Answer» (a) Non-chordates | |