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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.
| 3801. |
Organic compounds are have high melting and boiling points. |
| Answer» Solution :ORGANIC COMPOUNDS have LOW melting and BOILING points. | |
| 3804. |
Ordinary glass is a mixture of |
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Answer» SODIUM silicate, Calcium silicate |
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| 3805. |
Only the half filled orbitals of nearly same energy can participate in hybridization. |
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Answer» |
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| 3806. |
Only convalent bonds are present in methane (CH_(4)) |
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Answer» |
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| 3807. |
Only alkanes show isomerism. |
| Answer» Solution : False (ALKENES and alkynes also SHOW ISOMERISM) | |
| 3809. |
One way of conserving and managing is natural resource is to use it equitably. |
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Answer» |
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| 3810. |
Oneor morereactants combineto forma singleproduct in ______ reactions. |
| Answer» SOLUTION :COMBINATION | |
| 3811. |
One of the metals which reacts with hot sodium hydroxide solution to produce hydrogen gas is |
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Answer» sodium |
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| 3812. |
One of the main aim of conservation is to try and preserve the _______ we have inherited. |
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Answer» Ecosystem |
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| 3813. |
One of the following is not an example for a redox reaction , it is : |
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Answer» reaction of barium chloride with SODIUM dulphate |
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| 3814. |
One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is |
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Answer» a)HYDROCHLORIC ACID |
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| 3815. |
One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is |
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Answer» HYDROCHLORIC acid |
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| 3816. |
One molecule of an element contains 6.023 xx 10^(23) atoms and it is equal to its gram atomic mass. |
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Answer» |
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| 3818. |
One mole of H_(2)O corresponds to ………….. |
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Answer» 22.4 litre at 1 ATM and `250^(@)C` |
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| 3820. |
One moleof anygasat STPoccupies _______. |
| Answer» SOLUTION :24.4litres | |
| 3821. |
One mole of an element contains …………..atoms and it is equal to its gram atomic mass. |
| Answer» SOLUTION :`6.023xx10^(23)` | |
| 3822. |
One mole of a gas occupies a volume of 22.4 L. This is derived from ………….. . |
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Answer» Berzilliu's hypothesis |
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| 3823. |
Onemoleof a gas occupiesa volumeof 22.4l . Thisis derivedfrom : |
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Answer» BERZELIUS 's HYPOTHESIS |
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| 3824. |
One gram of which of the following contains the largest number of oxygen atoms? |
| Answer» Solution :`O_(3)` | |
| 3825. |
Onegramof whichof thefollowingcontainslargestnumberof oxygenatoms ? |
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Answer» O |
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| 3826. |
One electron is made to revolve around a pro ton and it possesses the least possible energy and another electron is made to revolve around an alpha-particle with the same energy. Calculate the ratio of the distances of the electrons from the respective species |
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Answer» Solution :Revolution of an electron AROUND a proton at the closest distance IMPLIES that it is a hydrogen ATOM in its ground state. Similarly, the other particle is `He^+`. The energy of the electron revolving around the nucleus of `He^+` should be -K. `therefore-k=(-kz^2)/(n^2)` `therefore n^2=4[thereforeZ=2]` `thereforen=2` The ratio of radii of the FIRST orbit of hydrogen to the second orbit of `He^+=(kxx1^2)/((kxx2^2)/2)=1:2` |
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| 3827. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. What values are shown by Mudra in this act? |
| Answer» Solution :The values shown by MUDRA are: (1) GOOD OBSERVATION skills, (2) Understanding of combustion of fuels, (3) Application of KNOWLEDGE in EVERYDAY life and ( 4 ) Concern for the environment. | |
| 3828. |
One day Suresh connected many house hold high power appliances having a current rating more than 6A to a multiplug of 6A rating when he was about to switch them on his elder sister shouted and asked him to remove the appliances from a single socket. a) According to you, why she would not advice to connect multi high power, appliances on a single socket? b) What would have happened if he switched them on. c) What was the value shown by his sister. |
| Answer» Solution : a) Connecting too many appliances to a single socket can cause overloading. b) A large amount of CURRENT would have flowed through the circuit beyond permissible value i.e, 6A. Due to overloading the wires of the circuit get heated which may also cause fire.c) Knowledge APPLICATION, concern for her BROTHER, presence of MIND. | |
| 3829. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. What step was taken by Mudra to get rid of this problem? |
| Answer» Solution :Mudra had SUGGESTED her mother to clean the holes of the gas BURNER properly lo bring in free FLOW of air sufficient for the complete COMBUSTION of fuel. | |
| 3830. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. What type of flame was produced by the gas stove burner after the required step was taken by Mudra's mother? |
| Answer» Solution :After the AIR holes of the GAS stove were opened fully by proper cleaning, then sufficient air was MADE available for the COMPLETE combustion of FUEL to produce smokeless, blue flame. | |
| 3831. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. What did Mudra find on checking the gas stove thoroughly which was causing this problem? |
| Answer» SOLUTION :MUDRA had found that the air HOLES of the GAS stove were PARTIALLY blocked. | |
| 3832. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. Apart from blackening the utensils, state two other disadvantages in this condition. |
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Answer» SOLUTION :Since the FUEL is not BURNING COMPLETELY, there is wastage of fuel. (B) The incomplete combustion of LPG puts unburnt carbon particles into the air and pollutes the environment. |
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| 3833. |
One day Mudra was talking to her mother who was cooking vegetables in a stainless steel utensils. Mudra observed that the bottom of cooking utensils was getting blackened from outside. She showed this to her mother. The mother told Mudra that the bottoms of all the cooking utensils kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X, Mudra checked the gas stove thoroughly and could understand the reason for this problem. She explained everything to her mother. As Mudra was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Mudra's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. Why is the bottom of cooking utensils getting blackened ? Explain. |
| Answer» Solution :The FUEL LPG is burning INCOMPLETELY in the gas stove producing yellow, sooty flame. The UNBURNT particles present in sooty flame stick to the BOTTOM of the cooking utensils and blacken it. | |
| 3834. |
One day Dimpy visited an aluminium industry with her father. She found that molten alumina was taken in the fused state for electrolytic reduction process. She asked her father the reason for using fused alumina as an electronlyte instead of the solution of aluminium salt, although the latter can save ample amount fo energy. Dimpy's father was plasesd with her concern for saving energy hence he explained to her why nothing could be done about that wastage of energy in that particular instance. What could be his explanation? |
| Answer» Solution :Aluminium cannot be prepared from its salt solutotion because of its HIGHLY electropositive nature. It does not get DISCHARGED at the cathode. `H_(2)` gas is liberated at the cathode when a solution of a salt of aluminium is electrolysed. | |
| 3835. |
One day Anita was standing in the kitchen and talking to her mother who was cooking vegetables in a stainless steel untensil. Anita observed that the bottom of cooking utensil was getting blackened from outside. She showed this to her mother. The mother told Anita that the bottoms of all the cooking utenisls kept on the gas stove were getting blackened for the last few days and she had tough time cleaning these utensils. Being a science student of class X Anita checked the gas stove thoroughly and could under-stand the reason for this problem. She explained everything to her mother. As Anita was getting late for school, she asked her mother to take a particular step to stop the blackening of cooking utensils. Anita's mother did the same. The mother was glad that the bottoms of cooking utensils kept on gas burner were no longer being blackened. (a) Why is the bottom of cooking utensil kept on burning gas stove getting blackene? Explain. (b) Apart from blackening the bottom of cooking utensils state two other disadvantages of using gas stove in this condition. (c) What did Anita find on checking the gas stove throughly which was causing this problem? (d) What step Anita might have askedher mother to take to get rid of this problem? (e) What type of flame was produced by the gas stove burner after the required step was taken byAnita's mother?Why? (f) What values are displayed by Anita in this episode? |
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Answer» SOLUTION : (a) The (LPG) is not burning completely in the gas stove producing a yellow, sooty flame. The soot (unburnt carbon particle) present in sooty flame sticks to the bottom of the cooking utensil and BLACKENS it. The incomplete burning of fuel (or LPG) giving sooty flame is DUE to the facts that sufficient air is not being made available for the complete burning of fuel. (b) (i)Since the fuel is not burning completely, there is wastage of fuel in this case. Due to this less heat is being produced. (ii) The sooty flame puts unburt carbon particles into the air and pollutes the environment. (c) Anita must have found that the air holes of the gas stove were partially blocked. (d) Anita must have asked her mother to CLEAN the holes of the gas burner properly to bring in free flow of air sufficient for the complete combustion of fuel. (f) The values displayed by Anita are (i) Good OBSERVATION skills (ii) Understanding of combustion of fuels under different conditions (iii) Application of knowledge in everyday situations, and (iv) Concern for theenvironment (to keep it clean). |
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| 3836. |
One day Amit went to a bicycle repair shop to get broken iron part of his younger brother's bicyclewelded. This shop has a gas welding set. At that time the main welder Mr. Ahmad was not present in the shop. Mr. Ahmad's assistant Chhotu offered to do the welding of broken bicycle part. When Chhotu started doing welding, Amit observed that a yellow sooty flame was being produced by the welding torch. By using this flame, Chhotu was unable to weld the two pieces of broken iron part together. Being a science student of class X Amit could understand the mistake being made by Chhotu. He pointed the mistake to Chhotu. Chhotu then followed the instructions of Amit and succeeded in welding the brokenIron part. By that time Mr. Ahmad had also arrived.He thanked Amit for correcting the mistake of Chhotu. He also advised Chhotu to be careful in future. (a) Which organic compound is used in gas welding? (b) What was the reason for the yellow sooty flame being produced by the welding torch? (c) Why the yellow sooty flame could not weld the broken iron pieces? (d) What was the mistake being made by Chhotu which was corrected by Amit? (e) What was the colour of the flame produced by welding torch now and why could it weld broken iron pieces together? (f) What values are displayed by Amit in this episode? |
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Answer» Solution :(a) The ORGANIC compound used in gas welding is acetylene (or ethyne). It is a gas. (b) The reason for the production of yellow sooty flame by the welding TORCH was theincomplete combustion of acetylene in air. This is because air does not contain sufficient oxygen to bring about the complete compution of acetylene (which has high percentage of carbon in it). (c) The temperature of yellow sooty flame obtained by burnig acetylene in air is not very high. This temperature of welding torch flame is insufficient to melt iron and weld the iron pieces together. (d) Chhotu was using the combustion of acetylene in air welding. He should have used the combustion of acetylene in pure oxygen for welding. Acutally, Chhotu,forgot to open the knob of oxygen cylinder before welding to mix oxygen with acetylene before lighting the welding torch. Amit asked Chhotuto use oxygen-acetylene flame welding. (e) The colour of oxygen-acetylene flame produced by burning a mixture of oxygen and acetelene in the welding torch was BLUE. The blue oxygen-acetylene flame is extremely hot and produces a very high temperature whihc is sufficient of melt iron and weld the two broken iron pieces together. (f) The values displayed by Amit in this EPISODE are (i) Awareness (or knwoledge) that in gas welding a mixture of acetylene and pure oxygen is BURNED in the welding torch so as to produce a very high temperature and (ii) Desire to help others. |
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| 3837. |
On which side of the periodic table do you find the metals ? |
| Answer» SOLUTION :METALS are PRESENT on the left side of the PERIODIC table. | |
| 3838. |
On which side of the periodic table do you find the non-metals ? |
| Answer» SOLUTION :Non-metals are PRESENT on the RIGHT SIDE of the PERIODIC table. | |
| 3839. |
On which side of the periodic table do you find (i) metals, (ii) non-metals ? |
| Answer» Solution :Metals are PLACED on the LEFT SIDE while non-metals are placed on the RIGHT side of the periodic table. | |
| 3840. |
On which factors the products obtained by the reaction of metal with nitric acid depend ? Explain with examples. |
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Answer» Solution :The PRODUCTS obtained by the REACTION of metal with nitric acid DEPEND on the amount of metal and the STRENGTH of acid. For example, reaction of metal with dilute nitric acid FORMS nitrate salts of metal and NO or `N_2O` gas but the metal with concentrated nitric acid forms nitrate salts of metal and `NO_2`gas. For example, 
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| 3841. |
On what principle an electric motor works? Define the rule used to identify the direction of force on the conductor in an electric motor. |
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Answer» Solution :The principle of an electric MOTOR is used on the fact that current carrying conductor PRODUCES a magnetic field around is current carrying conductor placed perpendicular lo magnetic field experiences a force. Flemings left hand rule used is to determine direction. The commercial motors use i) An electromagnet in place of permanent magnet. ii) Large number of TURNS of the CONDUCTING wire in the current carrying coil. iii) The soft IRON core, on which the coil is wound plus the coils is called armature |
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| 3842. |
On what factors does the process (method) used to remove the gangue from ores depend? |
| Answer» SOLUTION :The process (METHOD) used for REMOVING the gangue from the ores depends on the differences between the PHYSICAL or chemical properties of the gangue and ores. | |
| 3843. |
On what factors do the equilibrium position and equilibrium constant depend ? Explain by giving appropriate reasons . |
| Answer» SOLUTION :DIFFERENCE between POSITION and EQUILIBRIUM CONSTANT. | |
| 3844. |
On what chemical law, balancing of chemical equation is based? |
| Answer» Solution :Balancing of a CHEMICAL EQUATION is based on the law of CONSERVATION of MASS. | |
| 3845. |
On what basis, scientists classified the different elements in early attempts ? |
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Answer» Solution :Scientists classified the different ELEMENTS according to their PROPERTIES and obtained an orderly arrangement out of CHAOS. Scientists made the early attempts to classify the elements in metals and non-metals. Thereafter, further attempts of the classification of elements was CARRIED out as our knowledge of elements and their properties were further STUDIED. |
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| 3846. |
On what basis is Potassium (Z = 19) placed in4th period and group 1? |
| Answer» Solution :The electronic configuration of potassium is (2, 8, 8, 1) . It has four shells so it belongs to the PERIOD 4 . The period 4 has elements with the 4th shell being filled. Potassium has 1 ELECTRON in its valence shell. HENCE, it is placed in group 1. Group 1 has elements with 1 electron in the valence shell. | |
| 3847. |
On what basis is a chemical equation belanced ? |
| Answer» SOLUTION :Law of conservation of MASS - mass can neither be created nor destroyed but can be converted from one FORM to another. | |
| 3848. |
On what basis can you say that a reaction has actually taken place? |
| Answer» SOLUTION : Blue colour of COPPER sulphate solution turns GREEN during reaction. This CHANGE indicates that reaction has occurred | |
| 3849. |
On the basis of the periodic classification, identify each set belonging to either a group or a period : (a) Na, Mg, Al (b) Na, K, Rb (c) B, C, N (d) He, Ne, Ar. |
| Answer» SOLUTION :(a) PERIOD (B) GROUP (C) period (d) group. | |
| 3850. |
On the basis of origin, how acids are classified? |
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Answer» Solution :On the basis of origin, ACIDS are classjfied as: 1) ORGANIC acids 2) INORGANIC or mineral acids |
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