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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.
| 351. |
Oxygen is necessary for complete oxidation ofglucose. |
| Answer» Solution :(1)When glucose is completely oxidized in aerobic cellular respiration , it produces 38 molecules of ATP . (2) In cellular respiration, THREE processestake place one place one after the other, these are GLYCOLYSIS, Krebs cycle and electron transport chain reactions. (3) In absence of oxygen only glycolysis can occur but further TWO reactions will not take place. If glycolysis OCCURS in absence of oxygen, it produces alcohol. (4) By anaerobic glycolysis only two molecules of ATP are produced.This results in less energy supply to the body. Therefore, oxygen is necessary for complete oxidation of glucose. | |
| 352. |
What is the difference between focal length of convex and concave length? |
| Answer» Solution :Focal LENGTH of convex lens is POSITIVE while that of CONCAVE lens is NEGATIVE. | |
| 353. |
(i)Calculate the number of moles in 12.046xx10^23 atom of copper. |
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Answer» Solution :`12.046xx10^23` atoms of copper `6.023xx10^23` atoms of copper =1 mole `therefore 12.046xx10^23` atoms of copper =`(1xx12.046xx10^23)/(6.023xx10^23)`=2 moles of copper (ii) No. of moles=`"Mass"/"MOLAR mass"` Mass=No. of moles X molar mass Molar mass of `H_2O` = (2 x 1) +16 =18 Mass =2 x 18 =36 g (iii) Formula of magnesium sulphide =MgS Ratio of mass Mg and S =3:4 NUMBER of atoms in 3g of Mg = `N_A/24 xx3 =N_A/8` Number of atoms in 4g of S =`N_A/32xx4 =N_A/8` `therefore` Ratio of the number of Mg and S =`N_A/8:N_A/8` =1:1 |
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| 354. |
1 kWh = ......... J |
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Answer» `3.6 XX 10^6` `=3.6 xx 10^6 J` |
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| 356. |
Name the component of white light that deviates (I) the least and (Ii) the most while passing through a glass prism. |
| Answer» SOLUTION :(i) RED LIGHT (II) VIOLET light | |
| 359. |
Pharyngeal ganglion in leech is a part of |
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Answer» EXCRETORY SYSTEM |
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| 360. |
What kind of magnetic field is produced by a current carrying solenoid? |
| Answer» Solution :The MAGNETIC FIELD produced by a current-carrying solenoid is SIMILAR to the magnetic field produced by a BAR MAGNET. | |
| 361. |
Complete the following sentence: The conversion of part of energy into an undesirable form is called …….. |
| Answer» SOLUTION :DEGRADATION of ENERGY | |
| 362. |
What provides nutrition to human sperms ? State the genetic constitution of a sperm. |
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Answer» Solution :Nutrition to the SPERM is provided by the SECRETION of SEMINAL vesicle, bulbourethral gland and prostate gland. Genetic constitution of a sperm : 22 autosomes + X CHROMOSOME or 22 autosomes + Y chromosome |
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| 363. |
Heat |
| Answer» Solution :HEAT is the transfer of kinetic energy from ONE MEDIUM or an object to another, or from an energy SOURCE to a medium or an object. | |
| 364. |
If the area ESF is equal to are ASB, what will you infer about EF ? |
| Answer» Solution :ACCORDING to kepler's SECOND LAW, if area of ESF=area of ASB, then AB and EF are distances covered by planet in the same time . | |
| 365. |
17. A child can read his book easily but is unable to read the matter written on the black board. Name the defect of the eye from which he is suffering? |
| Answer» Solution :The child is suffering from the DEFECT of VISION CALLED MYOPIA. | |
| 366. |
Bilateral symmetry |
| Answer» Solution :If any ANIMAL BODY is divided into TWO EQUAL halves only through one imaginary axis, then such symmetry is called BILATERAL symmetry. | |
| 367. |
Efficiency of carnot engine working between ice point and steam point is |
| Answer» SOLUTION :`eta=1-T_2//T_1 =1 -273//273 = 26.8%` | |
| 368. |
In a dam,water falls at a rate of 1000 kg s^(-1) from a height of 100 m . (b)Assuming that 60% of the energy of the falling water is converted to electrical energy,Calculate the power generated (Take g=9.8 m s^(-2)) |
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Answer» Solution :Given :in ONE second 1000 kg of WATER falls. i.e., m=1000 kg ,t=1s, g=9.8 `MS^(-2)`,h=100 m . (a)Initial potential energy of water =MGH =`(0.6xx1000xx9.8xx100)/(1)J s^(-1)` `5.88xx10^(5)W` |
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| 369. |
Define Hooke's law of elasticity, proportionality, permanent set and breaking stress. |
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Answer» Solution :Hooke.s Law : If states that within elastic limit, stress is proportional to strain. `"i.e., stress"prop"strain"rArr("stress")/("strain")="constant(E)."` This constant is called elastic constant `(E).`  Proportionality limit : When load is incresed the elongation of the wire will also increases. The maximum load upto which the elongation is directly proportional to the load iscalled PROPOR- tionality limit `(A).` The graph DRAWN between load and EXTENSION. It is straight line .OA.. Permanent set : If the load on the wire is increased be- yond elastic limit, the elongation is not pro- portional to load. On removal of the load the wire cannot regain its original LENGTH. The length of the wire increases permanently. In figure permanent set is given byOP. This is called permanent set. Breaking stress : If the load is incresed beyond yield poin the elongation is very rapid, even for small changes in load and wire becomes THINNER and breaks. This is shown as E. The breaking force per unit area is called breaking stress. |
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| 370. |
Time dependence of a physical quantity P is given by P =P_0 exp(-alpha t^2), where alpha is a constant and t is time. The constant alpha is |
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Answer» dimensionless |
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| 371. |
Ina glassfilledwithwatera coinplacedat thebottom , ifviewedin askewanglethe coinis found __________. |
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Answer» At thebottom |
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| 372. |
Name the device which converts mechanical energy into electrical energy. |
| Answer» SOLUTION :ELECTRIC GENERATOR. | |
| 373. |
A block of mass 0.50 kg is moving with a speed of 2.00 m/son a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is |
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Answer» 0.16 ENERGY LOSS `=1/2=0.5xx2^(2)-1/2xx1.5xx(2/3)^(2)=0.67J` |
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| 374. |
The magnetic effect of electric current was discovered by |
| Answer» Solution :MAGNETIC effect of electric current was discovered by `UL("HANS Christian OERSTED")` . | |
| 375. |
You must have read the news about many deaths due to poisonous liquor,Why does it happen? |
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Answer» Solution :If alcohol is manufactured in a WRONG way by using any substrates.it forms the poisonous chemicals. Such chemicals can be lethal too. Any kind of alcohol is BASICALLY produced by the fermentation of the substrate.If the method adapted for making alcohol is wrong ,then it can also MAKE lethal solution that causes death after consuming the alcohol Alcohol consumption can cause long term effects too.the entire family of the alcoholic is devastated.Due to alcohol entire NERVOUS system, and especially brain,liver and kidneys are harmed permanently,Health is AFFECTED for ever . ` In thegrowing are if alcohol is consumed,the brain development does not take place in a proper way .All the feculties such as learning memory, thinking and reasoning are reduced because of alcohol.Along with disturbed physical health,mental and social health is also affected due to alcoholism |
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| 376. |
What does the slope of a speed-time graph indicate ? |
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Answer» Speed |
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| 377. |
What is the range of wavelengths of the visible light? |
| Answer» SOLUTION :Wavelength of visible light `=4XX10^(-7)m` to `8XX10^(-7)m` | |
| 378. |
What is the relation between anlage of incidence and angle of reflection? |
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Answer» |
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| 379. |
When planet Jupiter is at a distance of 824.7 million km from earth, its angular diameter is measured to be 35.72'' of arc. Calculate the diameter of Jupiter. |
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Answer» SOLUTION :`θ = 35.72′′` `1''=4.85xx10^(-6)` RADIAN implies `35.72''=35.72xx4.85xx10^(-6)` RAD. `d=DQ=824.7xx35.72xx4.85xx10^(-6)` `=1.4287xx10^(5)km` |
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| 380. |
(i) A ray of light falls normally on a face of a glass slab. What are the values of angle of incidence and angle of refraction of this ray? (ii) Light enters from air to a medium X. Its speed in medium X becomes 1.5xx10^(8)m//s. Speed of light in air is 3xx10^(8) m/s . Find the refractive index of medium X. |
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Answer» SOLUTION :(i) `/_i=0^(@)` and `/_r=0^(@)` (II) `n_(x)=C/(v_(x))=(3xx10^(8))/(1.5xx10^(8))=2` |
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| 381. |
Meditation is an effective way to manage stress. How ? |
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Answer» Solution :1. Mediation helps to improve the ability of concentration. 2. It imoparts positivity in our temperment. 3. Meditation thus helps to REDUCE stress improves concentration in their STUDIES. 4. It helps to fight with addictions. 5. It encourages a health LIFE STYLE and increases our srlf-awareness. 6. Therefore, mediation is an effective way to MANAGE stress. |
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| 382. |
A student sets up the apparatus for the experiment to show that CO_(2)is released duringrespiration After 2 hours what would he observe? |
| Answer» Solution :He WOULD observe the rise in water level in the BEAKER. This is because vacuum is created DUE to absorption of `CO_(2)` by KOH which RAISES the water level. | |
| 383. |
Name two energy sources that you would consider to be renewable. Give reason for your choices. |
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Answer» Solution :Two renewable energy sources are: (a) Sun: The energy DERIVED from the sun is called SOLAR energy Solar energ is produced by the FUSION of hydrogen into helium, fusion of helium into other heavy elements, and so on. A large amount of hydrogen and helium is present in the sun. So, solar energ can replenish on its own. The sun has 5 billion years more to burn. Hence, solar energy is a renewable energy source. (b) Wind: Wind energy is derived from air blowing with high speed. Wind energy is harnessed by windmills to generate ELECTRICITY. Air blows because of UNEVEN heating of the earth. Since the heatingof the earth shall continue for ever, wind energy shall also be available for ever. |
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| 384. |
Draw ray diagrams showing the image formation by a concave mirror when an object is placed.(a) between pole and focus of the mirror(b) between focus and centre of curvature of the mirror(c ) at centre of curvature of the mirror(d) a little beyond centre of curvature of the mirror(e ) at infinity |
Answer» SOLUTION :  
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| 385. |
The image of an object formed by a mirror is real, inverted and is of magnification - 1. If the image is at the distance of 30 cm from the mirror.(i) Where is the object placed ?(ii) Find the position of the image object is now moved 20 cm towards the mirror.(iii) What is the nature of the image obtained ? Justify your answer with the help of ray diagram. |
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Answer» Solution :IMAGE of an object FORMED by a mirror is real, inverted indicates that the mirror is a CONCAVE mirror and that the image is formed on the same side as the object. (i) `m=-1 , v=-30 cm` `m =-(v)/(U)` `-l=-((-30)/(u)), u=-30` cm is the object distance (ii) Find focal length of the concave mirror using data from 1. `(1)/(v)=(1)/(u)=(1)/(f)` `(1)/((-30))+(1)/((-30))=(1)/(f), f=-15 cm` `u=-10 cm , f=-15 cm, v = ?` `(1)/(v)+(1)/(u)=(1)/(f)` `(1)/(v)+(1)/((-10))=(1)/((-15)), v = +30 cm` The + sign indicates that the image is formed behind the concave mirror (iii) `m=-(v)/(u)` `m=-((30)/(-10)), m = 3` The image is erect, virtual and enlarged 
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| 386. |
In the standard equation S_(nth)=u+(a)/(2)(2n-1) what dimensions do you view for S_(nth) |
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Answer» `[M° L^(1) T°]` |
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| 387. |
With a neat labelled diagram, explain twinkling of a star. Also explain why a planet does not twinkle. |
| Answer» Solution :Since planets are quite near the EARTH in comparison with the stars, they DONOT act as pointsources but behavelike extended SOURCES. Planets may be considered as collection of a large number of point sized sourcesof light. The total NET deviation in amount of light entering our eyes from different pointsources is zero. Therefore there is no net twinkling of planets. | |
| 388. |
Determine the equivalent resistance between point A and B in the following circuit: |
| Answer» SOLUTION :`2 OMEGA` | |
| 389. |
What is the condition for Rayleigh scattering ? |
| Answer» SOLUTION :Size of SCATTERER MUST be much smaller thanwavelength of INCIDENT light. | |
| 390. |
Name any two devices, which are working on the heating effect of the electric current . |
| Answer» Solution :The heating EFFECT of electric CURRENT is USED in MANY APPLIANCES as electric iron and electric toaster. | |
| 391. |
Complete the following flow chart based on ecosystem and its components. |
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Answer» Solution :(i) AQUATIC (II) ABIOTIC (iii) Soil, WATER, Air (iv) Plants and Animals (v) All the interacting organisms in an AREA together with the non-living constituents of the environment form an ecosystem. |
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| 392. |
Explain the function of an earth wire. Why is it necessary to earth metallic appliances ? |
| Answer» Solution :EARTH wire is used as a safety measure especially for those appliances that have a metallic body, for EXAMPLE - electric press, TOASTER etc. The metallic body is connected to the earth wire, which provides a low RESISTANCE conducting path for the current. Thus it ensures that any leakage of current to the metallic body of the appliances keeps its potential to that of the earth and the user may not get a severe shock. | |
| 393. |
Make a list of International Environment Organizations. |
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Answer» Solution :i. International Union for Conservation of Nature ( IUCN), GLAND VD, Switzerland. ii. Intergovernment Panel on Climate Change (IPCC), Geneva. iii. UNITED Nations Environment Program, ( UNEP) NAIROBI, Kenya. iv. Wold WILDLIFE FUND (WWF ) , Switzerland. v. Birdlife International, Cambridge. vi. Green Climate Fund ( GCF), Songdo, S.Korea. |
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| 394. |
State the merits and demerits of a series cnmbination of resistors. |
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Answer» Solution :Merits: ( 1 ) The total resistance in the circuit can be increased by connecting the resistors in series. This decreases the current in the circuit. Thus, to control the current in the circuit, the series combination of resistors is USEFUL. ( 2 ) The fuse is CONNECTED in series with AC mains as well as in an electrical appliance and in the domestic electric connection. Therefore, whenever a short circuit occurs in any electrical appliance, the fuse wire melts and stops the electric current. As a RESULT, damage to the electrical appliances can be prevented. Demerits: ( 1 ) If the electrical applinaces are connected in series, the applied voltage is divided across every appliance, e.g., if three IDENTICAL bulbs operating on 240V are connected in series with supply voltage of 240V, each bulb gets 80V. Each bulb at 80V cannot give light efficiently as compared to its voltage capacity. In short, they will give dim light. ( 2 ) In a series combination, if a fault occurs in one appliance or the circuit breaks, then the current does not flow in the circuit and hence all other appliances stop working, e.g., if one of the three bulbs gets fused, other two bulbs do not light up. |
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| 395. |
The theory of natural selection which mentions 'Survival of Fittest' is given by Lamarck. |
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Answer» |
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| 396. |
Distinguish between the physical properties of metals and nonmetals with respect to the point : Conduction of heat and electricity |
| Answer» Solution :CONDUCTION of heat and ELECTRICITY : Metals are good conductors of heat and electricity. NONMETALS are bed conductors of heat and electricidty. Exception : Graphite is a good CONDUCTOR of electricity. | |
| 397. |
Fill in the blanks: (i) The degenerated and non-functional organs found in an organism are called______. (ii) The theory of natural selection for evolution was proposed by ____. |
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Answer» Charles Darwin |
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| 399. |
A spherical lens is used to obtain an image on a screen. The size of the image is four times and size of the object . What is the type of lens and at what distance is the screen placed from the lens ? |
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Answer» Solution :Data : `M=-4`, TYPE of lens ?V=? As the iamge FORMED by the lens is obtained on a screen , it is a real image. The lens is , therefore, a convex lens. `M=-4 v/utherefore u=-v/4` `1/f =1/v- 1/u=1/v-(1)/((-v//4))=1/v+(4)/(v)=(5)/(v)` `therefore v=5f` The DISTANCE of the screen from the lens =5f. |
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| 400. |
Thermometer is used to measure .... |
| Answer» SOLUTION :TEMPREATURE | |