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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.
| 2951. |
The moon and the artificial satellites are all in free fall. |
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Answer» |
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| 2952. |
Out of 4.0 and 4.00, which is more accurate? |
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Answer» `4.0` |
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| 2953. |
Molecular motion shows itself as |
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Answer» Temperature |
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| 2954. |
Light of two colours A and B passes through a prism. A deviates more than B from its path incidence. Which colour has a higher speed in the prism ? |
| Answer» Solution :The ANGLE of deviation is inversely proportional to speed. SINCE B has LESSER angle of deviation, it gas HIGHER speed in the prism. | |
| 2955. |
The critical angle for material of which the equiangular prism ABC shown in figure is made, is 60^(@). A ray of light incident on the side AB of the prism is refracted along DE such that the angle it makes with the side AC is 150^(@) and angleEDB=90^(@). draw the path of the incident ray on the side AB (which travels along DE) and also the path along which the ray DE travels from the point E onwards. |
Answer» SOLUTION :The COMPLETED diagram is shown in figure. Since the refracted ray DE is normal to the surface AB of the prism (i.e., `angler=0^(@)`), so the INCIDENT ray at the point D should also be normal to the surface AB so that `anglei=0^(@)`. at the point E, the angle of incidence for the ray DE is `150^(@)-90^(@)=60^(@)` which is equal to the critical angle, so the ray DE is refracted at `90^(@)`, i.e., it is refracted along EC. 
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| 2956. |
State the law of combination of resistances in series and draw a circuit diagram containing three resistors connected in series. |
Answer» Solution :When two (or more) resistances are CONNECTED end to end CONSECUTIVELY with one source such that the closed path is formed, then they are SAID to be connected in SERIES (see figure ). 
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| 2958. |
Convert 3ms^(-2)" to km "h^(-2) |
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Answer» SOLUTION :`3ms^(-2)=((3)/(1000)km)((1)/(60xx60)hr)^(-2)` `=(3xx(60xx60)^(2))/(1000)=3.8880xx10^(4)KMH^(-2)=3.9xx10^(4)kmh^(-2)` |
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| 2959. |
An environmentalist on visit to your school suggested the use of three R'S to save the environment. Explain what he meant by three R’S and how you would follow his advice at home. |
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Answer» Solution :Three R’S to save the ENVIRONMENT : we can reduce pressure on the environment by applying the maxim of reduce, recycle and reuse in our lives. Reduce means to use less: • By switching off unneccessary lights and FANS to save electricity. •By repairing leaky taps to save WATER . •By not wasting food Recycle means to collect plastic , paper, GLASS and metal items and recycle these materials to make required things. • In order to recycle , firstly segregation of waste is necessary so that materials that can be recycled are not dumped along with other wastes .Reuse means to use things again and again again. • The used envelope can be reversed and used again instead of being thrown away. • The plastic BOTTLES of food item like jam or pickle can be used for storing things in the kitchen. |
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| 2960. |
Non - chordates and Chrodates . |
Answer» SOLUTION : 
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| 2961. |
What happenes to the compass needle if the direction of electric is reversed. |
| Answer» Solution :If the DIRECTION of electric current is REVERSED the compass NEEDLE is DEFLECTED in the opposite direction. This shows that when we reverse the direction of electric current flowing in the wire, then the direction of magnetic FIELD produced by it is also reversed | |
| 2962. |
Transcription |
| Answer» Solution :PROCESS of SYNTHESIS of m-RNA according to the nucleotide sequence present on DNA is CALLED TRANSCRIPTION. | |
| 2963. |
State the role of alkaline KMnO_(4)in the reaction involving conversion of an alcohol to corresponding carboxylic acid. |
| Answer» SOLUTION :Alkaline `KMnO_(4)`ACTS as an OXIDISING agent. | |
| 2964. |
What is thermal expansion of the object ? |
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Answer» Solution :(i) When heat ENERGY is SUPPLIED to an object, there can be an increase in DIMENSION of the object. (ii) This change in the dimension due to rise in TEMPERATURE is callled thermal EXPANSION of the object. |
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| 2965. |
Draw a figure explaining various terms related to a lens |
Answer» Solution : i. Principal axis: The imaginary line passin through both centres of curvature is called th! principal axis of the lens. ii. OPTICAL centre: The point INSIDE a lens on the principal axis, through which light RAYS PASS without changing their paths is called the optical centre of a lens. iii. Centre of curvature: The centre of sphere whose part forms the surface of the lens is called centre of curvature of the lens. iv. Radius of curvature: The radius of the sphere whose part forms the surface of the lens is called radius of curvature of the lens. v. Principal focus: a. When light rays parallel to the principal axis are INCIDENT on a convex lens, they converge to a point on the principal axis. This point is called the principal focus of the lens. b. Rays travelling parallel to the principal axis of a concave lens diverge after refraction in such a way that they appear to be coming out of a point on the principal axis. This point is called the principal focus of the concave lens. vi. Focal length: The distance between the optical centre and principal focus of a lens is called its focal length. |
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| 2966. |
Identify the poles of the magnet in the figure. |
Answer» SOLUTION :The POLES of the MAGNET are SHOWN below :
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| 2967. |
What is overloading and short circuiting ?What is the function of earth wire ? |
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Answer» Solution :Refer to Topic 2 SATQ-I, Q. 2. To avoid risk of ELECTRICAL SHOCK, the metal body of the appliances is EARTHED. Earthing means to connect the metal case of the appliance to EARTH by a means of a metal wire CALLED earth wire. 1 + 1 + 1 |
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| 2968. |
The animal which does not have eyes that look sideways is : |
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Answer» Horse |
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| 2969. |
Magnetic lines of force cross each other .State true/false. Give reasons for your answer |
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| 2970. |
Explain the terms limiting friction , dynamic friction and rolling friction . |
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Answer» Solution :LIMITING FRICTION : Frictional forces always oppose relative motion between the bodies . These forces are self adjusting forces . Their magnitude will increase upto some extent with the value of applied force . The maximum frictional force between the bodies at rest is CALLED "limiting friction ". Dynamic (or) kinetic friction : When applied force is equal to or greater than limiting friction then the body will move. When once notion is started then frictional force will abruptly falls to a minimum value . Frictional force between moving bodies is called dynamic (or) kinetic friction Kinetic friction is always less than limiting friction . Rolling friction : The RESISTANCE encountered by a rolling body on ASURFACE is called rolling friction . |
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| 2971. |
The sun appears red at sunrise and sunset. This is due to scattering of |
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Answer» LONGER wavelengths |
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| 2972. |
Readin, Cooking, Smoking, Drawing. |
| Answer» Solution :SMOKING. It causes mental STRESS while, the REST relieve stress. | |
| 2973. |
Budding in hydra |
| Answer» Solution :Budding in hydra is asexual reproductive process in which an OUTGROWTH is formed by REPEATED divisions of regenerative CELLS of BODY wall called BUD. | |
| 2975. |
The calorific values of five fuels A, B, C, D and E are give below : A 48 kJ/g B17 kJ/gC 150kJ/gD50 kJ/gE 30kJ/g Which of the fuels could be :(i) cooking gas (ii) alcohol (iii) wood (iv) hydrogen (v) kerosene ? |
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| 2976. |
Why are testes located outside the abdominal cavity ? |
| Answer» Solution :Sperm formation requires a lower TEMPERATURE than the normal body temperature this temperature is `1-3^(@)C`lower than the temperature of the body. Testis are located OUTSIDE the ABDOMINAL cavity, in the SCROTUM to provide right temperature. | |
| 2977. |
(a) What is the order of longest visible wavelength ? Which colour has it ? (b) What is the order of shortest visible wavelength ? Which colour has it ? |
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Answer» Solution :(a) The LONGEST visible wavelength is `~~ 8000 A^@`. It is of RED colour. (B) The shortest visible wavelength is `~~ 4000 A^@`. It is of violet colour. |
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| 2978. |
In a convex mirror for any position of the object in front of mirror, the image formed is |
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Answer» SITUATED between pole and principal focus of mirror |
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| 2979. |
The image formed by a concave mirror is observed to be virtual, erect andlarger thant the object. Where should be the position of the object? |
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Answer» Between the PRINCIPAL FOCUS and the CENTRE of curvature |
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| 2980. |
What is the need of using combination of resistance in electrical circuits? Define equivalent resistance. |
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Answer» SOLUTION :Combination of resistances is used in circuit so as to get the desired value of current in an electrical circuit. i] SERIES combination ii] Parallel combination iii] Series-parallel combination. Equivalent resistance: If a SINGLE resistance can replace the combination of resistances in such a MANNER that the current in the circuit remains UNCHANGED, then that single resistance is called the equivalent resistance. |
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| 2981. |
Ethanoic acid reacts with sodium hydrogen carbonate to produce a salt 'X' and a gas 'Y'. Identify 'X' and 'Y' and write their chemical names. With the help of a labelled diagram describe an activity to confirm that the gas 'Y' is correctly identified by you. Also write the chemical equation of the reaction involved. |
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Answer» SOLUTION :`X : CH_(3)COONa`, Sodium ethanoate, `Y : CO_(2)`, Carbon dioxide A diagram showing passage of `CO_(2)`through lime water. `CA(OH)_(2)+CO_(2) RARR CaCO_(3) + H_(2)O` `Or" "CH_(3)COOH+NaHCO_(3) rarr CH_(3)COONa + CO_(2) + H_(2)O` |
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| 2982. |
A student prepared a temporary mount of a leaf peel and observed some green dots. Name these green dots and name the pigment present in them. |
| Answer» SOLUTION :These green dots are CHLOROPLASTS. PIGMENT present in them-Chlorophyll | |
| 2983. |
Onemoleofanygasoccupies_________ ml atS.T.P |
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Answer» 25400 |
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| 2984. |
What is the magnification produced by a plane mirror? |
| Answer» SOLUTION :Plane MIRROR cannot magnify image and has magnification 1 because height of image fmmed is EQUAL to that of OBJECT | |
| 2985. |
The speed of sound is ____ in solids than in liquids. |
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Answer» `V_(S)gtV_(L)gtV_(G)` |
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| 2986. |
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes? |
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Answer» Solution :`E=Pxxt` `{:("For T.V.","For toaster"),(E_(1)=250xx1xx3600,E_(2)=1200xx10xx60),(E_(1)=900000J,E_(2)=720000J),(E_(1)=9XX10^(5)J,E_(2)=7.2xx10^(5)J):}` `toE_(1)gtE_(2)` THEREFORE T.V set USES more ENERGY. |
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| 2987. |
What is power of sun glass? |
| Answer» Solution :SUN glasses do not CONVERGE or diverge RAYS of light hence have no power. | |
| 2988. |
State the relation between._(2)n_(1) and critical angle |
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| 2989. |
(a) State the laws of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vaccum. (b) The absolute refractive indices of two media 'A' and 'B' are 2.0 and 1.5 respectively. If the speed of light in medium 'B' is 2 xx 10^(8) ms^(-1), calculate the speed of light in (i) vaccum (ii) medium 'A'. |
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Answer» Solution :(a) See POINT Numbers 21 and 23 under the HEADING "Chapter At A Glance". (b) Here `n_(A) = 2.0 and n_(B) = 1.5 and v_(B) = 2 xx 10^(8) ms^(-1)` (i) `because n_(B) = (c)/(v_(B))` HENCE speed of light in VACUUM `c = n_(B) xx v_(B) = 1.5 xx 2 xx 10^(8) = 3 xx 10^(8) ms^(-1)` (ii) `because n_(A) = (c)/(v_(A)) and c = 3 xx 10^(8) ms^(-1)` `therefore v_(A) = (c)/(n_(A)) = (3 xx 10^(8))/(2.0) = 1.5 xx 10^(8) ms^(-1)` |
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| 2990. |
What is the purpose of sustainable development ? |
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Answer» Solution :Sustainable DEVELOPMENT The concept of sustainable development ENCOURAGES forms of growth that meet current basic human needs, while PRESERVING the resources for the needs of future generations. Economic development is linked to environmental conservation. Thus sustainable development implies a CHANGE in all aspects of life. It depends upon the WILLINGNESS of the people to change their perceptions of the socio-economic and enviromental conditions around them, and the readiness of each individual to alter their present use of natural resources. |
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| 2991. |
A ray of green light enters a liquid from air, as shown in figure. Angle 1 is 45^(@) and angle 2 is 30^(@). (a) Find the refractive index of the liquid (b) Show in the diagram the path of the ray after it strikes the mirror and re-enters in air. mark in the diagram the angles wherever necessary. (c) Redraw the diagram if plane mirror becomes normal to the refracted ray inside the liquid. state the principle used. |
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Answer» or `1*41`. |
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| 2992. |
In activity 13.7 how do we think the displacement of rod AB will be affected if (i) Current in rod AB is increased (ii) A stronger horse - shoe magnet is used & (iii) Length of the rod AB is increased ? |
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Answer» SOLUTION :The displacement of rod AB is increased due to magnetic force exerted on it, if : (i) If the CURRENT in the rod is increased, then rod will be deflected with greater force (ii) If a stronger horse - shoe MAGNET is used force increases due to the INCREASE in magnetic field. (III) If the length of the rod AB is increased. More will be the displacement in the rod AB. |
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| 2994. |
Explain redox reaction withsuitable example. |
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Answer» Solution :The reaction whichinvolvessimultaneous oxidation and reduction is called an oxidation-reduction or redox reaction. In a redox reaction, one reactant gets oxidised while the other gets reduced during a reaction. Redox reaction = Reduction + Oxidation In redox reaction, the reductant is oxidised by the oxidant and the oxidant is reduced by the reductant. Example : `CuO_((s)) + H_(2(g)) + H_(2)O` In this reaction, oxygen is removed from copper oxide THEREFORE it is a reduction of CuO, while hydrogen accepts oxygen to FORM water that means oxidation of hydrogen take place. THus oxidation and reduction reactions OCCUR simultaneously. Other examples of redox reactions : `underset("Hydrogen")(2H_(2)S) + underset("sulphide")(SO_(2)) tounderset("SULPHUR")(3S) + 2H_(2)O` `underset("Manganese dioxide")(MnO_(2))+4HCl to underset("Manganese chloride")(MNCl_(2))+2H_(2)O+Cl_(2)uparrow` |
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| 2995. |
Speciation : |
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Answer» Solution :(1) Formation of a new species of living organisms is called speciation. (2) Darwin has proposed that speciation is DUE to evolution. (3) Each species has its own SPECIFIC geographical conditions. There is difference in the food, habitat, reproductive ability and period etc. (4) Such genetic variation helps in the formation of new species from old one. (5) MOREOVER, geographical and reproductive changes are responsible for speciation. (6) Species is the group of organisms that can produce FERTILE individuals through natural reproduction. Therefore, they GET isolated from other species and are not able to perform reproduction with them. |
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| 2997. |
Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. The animals Lion tailed macaque and Lesser florican are classified under which category? |
| Answer» SOLUTION :Lion tailed MACAQUE and LESSER florican are CLASSIFIED as endangered SPECIES. | |
| 2998. |
Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. What would be the reason for decline in number of animal species? |
| Answer» Solution :Anthropogenic activities like POACHING, MINING, CONSTRUCTION of dams, etc., has lead to DESTRUCTION of wildlife habitat, thereby declining the number of animal species. | |
| 2999. |
Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. What must be the reason that these species are not commonly observed outside the national park ? |
| Answer» Solution :THREATENED SPECIES are endemicand their number is DECLINING very fast. HENCE, they are protected by in-situ CONSERVATION in national parks, etc., and may not be spotted elsewhere. | |
| 3000. |
Students were taken on a field trip to a national park. They were curious to observe the threatened wild species. They noted down their spotting and discussed the same observations with their teacher. A group of students observed lion tailed macaque and musk deer, but the other group could only spot Lesser florican. Mention any two other examples of threatened species. |
| Answer» Solution :Red PANDA, TIGER, Lion, Giantsquirrell ( Shekru), etc., are examples of THREATENED SPECIES. | |