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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.
| 8851. |
If the absolute refractive index of glass is 1.5 and thatof water is (4)/(3), find the refractive index of water with respect to glass. |
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| 8852. |
{:(1.,"Infrasonic",-,(a),"Compressions"),(2.,"Echo",-,(b),22kHz),(3.,"Ultrasonic",-,(c),10Hz),(4.,"High pressure region",-,(d),"Ultrasonography"):} |
| Answer» Solution :1. (c) 10HZ 2. (d) ULTRASONOGRAPHY 3.(B) 22kHZ 4. (a) Compressions | |
| 8853. |
Define refractive index of a medium. |
| Answer» Solution :REFRACTIVE index of a medium `n = ("Speed of LIGHT in VACUUM (C)")/("Speed of light in GIVEN medium (v)")` | |
| 8854. |
The image distance from the eye lens in the normal eye when we increase the distance of an object from the eye |
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Answer» increases. |
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| 8855. |
Which of the following are the primary colours. |
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Answer» RED BLUE, YELLOW |
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| 8856. |
There resistors of 3 Omega each are connected to a battery of 3 V as shown. Calculate the current drawn from the battery. |
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Answer» SOLUTION :`R_(4)=R_(1)+R_(2)=3 Omega+3 Omega=6 Omega` `(1)/(R_(5))=(1)/(R_(4))+(1)/(R_(3))=(1)/(6) +(1)/(3)=(1+2)/(6)=(3)/(6) =(1)/(2) Omega` `R_(5) = 2Omega` CURRENT `I = (V)/(R_(5))=(3 V)/(2 Omega)= 1.5` Amp |
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| 8857. |
It is necessary to connect an earth wire to electric appliances having metallic covers. Why? How will you identify earth wire in household circuit ? |
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Answer» Solution :The earth wire is connected to a metallic plate deep inside the earth. In this way, the metallic BODY of APPLIANCE is connected to the earth, which PROVIDES a low resistance conducting path for electric current. HENCE, any lea.lcage of current to the metallic body of appliance keeps the potential to that of earth. The user might not get a severe electric SHOCK on touching such an appliance. Earth wire has green insulation, so it can be indentified. |
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| 8858. |
What is meant by satellite launch vehicles? Explain a satellite launch vehicle developed by ISRO with the help of aschematic diagram. |
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Answer» SOLUTION :(i) The vehicles with the help of which the satellites are placed in their specific ORBITS are called satellite launch vehicles. (ii) Polar satellite launch vehicle (PSLV) designed byISRO is shown in a figure below . This PSLV is a four stage satellite launch vehicle. Each of these stages is detached from the vehicle after reaching specific height . There is a place at the top of the fourth stage , to keep the polar satllite to be launched .  (iii) Amongst four stages , first stage along with six rocket booster engines provides the initial thrust to the launcher. This stage contains solid FUEL . (IV) The second and foruth stage works on the solid fuel . (v) Second and third stages increase the velocity of the PSLV and help it attain the desirable height .The fourth i.e. , the last stage sets the satellite into its desired orbit. |
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| 8859. |
Power plant based on naturalgas |
| Answer» SOLUTION :In a power plant based on natural gas, there are three MAIN sections of the plant. There is combustion chamber with compressor in which the steam under pressure is introduced. The natural gas BURNS in the presence of air in this combustion chamber. This results in a PRODUCTION of a gas which is at very high temperature and pressure. This generated gas from the chamber runs the turbine drived the GENERATOR. The generator produces electrical energy. | |
| 8861. |
(a) Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms ? Explain.(b) Draw a diagram of human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it. |
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Answer» Solution :(a) The rate of breathing is SLOWER in terrestrial ORGANISMS as compared to aquatic organisms. This is due to the FACT that in water, the AMOUNT of O2 is less as compared to air while in aquatic animals the rate of breathing is faster. (b)  .
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| 8862. |
If a body is realeased from the top of a tower, the graph between distance (x)and time (t) is correctly shown by |
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`xpropt^(2)` It is of the FORM `ypropx^(2)`, which is the EQUATION of a parabola, as shown in (a). |
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| 8863. |
A uniform metre rule is pivoted as its mid point. A weight of 50gf is suspended at one end of it. Where should a weight of 100gf be suspended to keep the rule horizontal? |
| Answer» SOLUTION :At DISTANCE 25 CM from the other END. | |
| 8865. |
While seeing the nearby object the focal length of the lens increases. |
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| 8866. |
Explain centripetal force with example. |
| Answer» Solution :The MOON revolves around the earth due to the gravitational force EXERTED on it by the earth. This force is DIRECTED TOWARDS the centre of the earth and is THUS a centripetal force. | |
| 8867. |
The image of an object formed by a mirror is real, inverted and its of magnification -1. If the image is at a distance of 40 cm from the mirror, where is the object placed ? Where would the image be if the object is moved 20 cm towards the mirror? State reason and also draw ray diagram for the new position of the object to justify your answer. |
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Answer» Solution :MAGNIFICATION, m = -1, Image is real and inverted: Image distance = -40 cm `""....[because "image is real"]` `(-v)/(u) = m""rArr""(-(-40))/(u) = -1""rArr""u = (-(-40))/(-1)` `rArru = -40cm""therefore"""Object is placed at 40 cm in front of the mirror"`. When object distance is equal to the image distance and image is real, then the object is placed at C. If the object is MOVED 20cm towards themirror, then its newposition would be at the focus of the mirror. ltbr? According to the mirror formula, `(1)/(f)=(1)/(v)+(1)/(u)""rArr""(1)/(f)=(1)/(-40)+(1)/(-40)""rArr""(1)/(f)=(-1)/(40)-(1)/(40)` `rArr (1)/(f)=(-2)/(40)=(-1)/(20)""rArr""f = -20 cm` Second CASE : `f = -20 cm""u = -20 cm` `(1)/(v)+(1)/(u)=(1)/(f)""rArr""(1)/(v)+(1)/(-20)=(1)/(-20)` `rArr (1)/(v)-(1)/(20)=(-1)/(20)""rArr""(1)/(v)=(-1)/(20)+(1)/(20)` `rArr (1)/(v) = 0 rArr v = (1)/(0) prop""therefore` Thus, image will be formed at infinity. 
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| 8868. |
(i) 4-5 needle is palced 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror. (ii) What kind of the mirror is used in a solar furnace? Give reason for using this mirror. (iii) One half of a convex lens is covered with a black paper. Will this lens produce a complete image ofthe object? Justify your answer. |
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Answer» Solution :(i) `u=-12cm` `f=+15cm` Using mirror FORMULA `1/f=1/u+1/vimplies1/v=1/f-1/u` `implies1/v=1/15-1/(-12)` `impliesv=60/9=6.7cm` Magnification `m=(-v)/u=(h_(2))/(h_(1))` `=(-6.7)/(-12)=0.558` `m=(h_(2))/(h_(1))` `h_(2)=h_(1)xxm` `h_(2)=0.558xx4.5` `h_(2)=2.5cm` As the needle is moved farther from the mirror, image moves to the focus and size of image goes on decreasing. (ii) CONCAVE mirrors are used in solar furnaces as they CONCENTRATE solar energy in the focal plane and help in attaining high temperatures. (III) When one half of a convex lens is covered with a black paper, the lens will produce a complete image of the OBJECT but the intensity of the image is reduced because rays from the top portion of the lens only are refracted and forms the image. |
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| 8869. |
Draw a simple sketch of human eye and label any five important constituents of the eye. |
Answer» SOLUTION :We have LABELLED six CONSTITUENTS of human EYE.  .
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| 8870. |
In a solenoid, the current through each circular loop flows in the same direction. What is its effect ? |
| Answer» Solution :Since the MAGNETIC field of all CIRCULAR LOOPS is in the same DIRECTION, it adds UPTO produce a very strong magnetic field. | |
| 8871. |
What are the contributing factors for Obesity ? |
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Answer» SOLUTION :(a) The contributing factors for OBESITY. (i) Genetic factors (ii) physical INACTIVITY (iii) Eating habits (Over eating) (IV) endocrine factors (b) Genetic engineering is the manipulation and transfer of genes from one organisms to another organisms to create a new DNA is called as recombinantDNA (DNA). The Genetic engineering is ALSO called as recombinant DNA technology. |
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| 8872. |
The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should be the position of the object ? |
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Answer» between the FOCUS and CENTRE of curvature |
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| 8873. |
Is the position of a star as seen by us its true position ? Justify your answer. |
| Answer» Solution :No. As the light from a STAR passes through the earth.s atmosphere, it undergoes multiple refractions due to changes in REFRACTIVE index in different regions of the atmosphere. Thus atmosphere refraction tends to bend starlight towards the normal and hence, the star appears slightly higher than its ACTUAL position as SHOWN. | |
| 8874. |
Find out from Table 1.3, the medium having highest optical density. Also, find the medium with lowest optical density. |
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Answer» Solution :The MEDIUM with HIGHEST optical density is diamond, and its refractive INDEX is maximum `(= 2.42)`. Also, the medium with lowest optical density is air, and its refractive index is minimum `(= 1.0003)`. |
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| 8875. |
One eV (electron volt) of nuclear energy is equivalent to : |
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Answer» `1.6 xx 10^(-14) J` |
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| 8876. |
"The size of the atom (molecule) are caused the colour of the substance ". How do you prove it ? |
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Answer» Solution :1) Take a solution of sodium-thio-sulphate(hypo) and SULPHURIC acid in a glass beaker. 2) Place the beaker in an open place where abundant sunlight is available. 3) Watch the formation of grains of SULPHUR and observe changes in the beaker. 4)Sulphur precipitates as the reaction is in progress. 5) At the begining, the grains of sulphurare smaller in size and appear blue in colour. Asthe reaction progresses, the size of grains increases and slowly their colour becomes white. 6) At the beginning, the size of grains is small and almost comparable to the wavelength of blue light. HENCE they appear blue. 7) As the size of grains increases their size becomes comparable to the wavelengths of other COLOURS and thesegrains act as scattering CENTRES for other colours. 8) The combination of all these colours appears as white. |
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| 8877. |
On what principle is an a.c. generator based ? |
| Answer» SOLUTION :It is based UPON Fleming.s right HAND RULE. | |
| 8878. |
Solar photovoltaic cells convert solar energy directly into ________ energy. |
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Answer» NUCLEAR |
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| 8879. |
Draw molecular structures of the following : (a) Hexanal (b) Bromopentane (c) Propanone |
Answer» SOLUTION :Molecualr STRUCTURES : 
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| 8880. |
(a) List in tabular form two differences between an acid and a base based on their chemical properties. (b) What do you understand by neutralization reaction ? Give two examples to illustrate your answer with equations. |
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Answer» Two examples : `HCL + NAOH toNaCl + H_(2)O` `H_(2) SO_(4) + Mg(OH)_(2) to MgSO_(4) + 2H_(2)O` |
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| 8881. |
The resistace of a resistor is reduced to half of its initial value, In doing so, other parameters of the circuit remains unchanged. The heating effects in the resistors will become |
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Answer» TWO times `H.=(V^2t)/R.=(V^2t)/((R//2))=(2V^2t)/R=2H` |
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| 8882. |
Animals belonging to phylum Annelida perform locomotion with the help of tube-feet. |
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| 8883. |
District control unit is established immediately either after the impact of disaster or getting intimation about it. |
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| 8884. |
A student determines the focal length of a device X, by focusing the image of a far off object on the screen positioned as shown in the figure alongside. The device X is a : |
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Answer» CONVEX lens |
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| 8885. |
How are fats digested in our bodies? Where does this process take place ?n Explain. |
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Answer» Solution :Digestion of fats takes place in the small intestine the fats are digested by the digestive enzymes. The fats arc PRESENT in the from. of large globle in the small intestine. Bile juice sccreted by the liver is produced in the intestine along. pulureatic juice. The bile salts present in the bile juice emulsify the large globles of fats. So by cmulsification large globles breakdown into fine globules to provide large SURFACE arca to act upon by the enzymes: Enzyme present in the pancratic juice cause breakdown of emusified fats. Glands present in the WALL of small intestine SECRETES intestinal juice which contains lipase enzyme that CONVERTS fats into faty acids and glyccrol. |
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| 8886. |
The unit of 'g' isms^(-2) . It can be expressedas ________. |
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Answer» `cm s^(-1)` |
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| 8887. |
Judge the equivalent resistance when the following are connected in parallel: 1 Omega,10^3 Omega and 10^6 Omega |
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Answer» Solution :(a) Less than 1`Omega` (but approximately `1 Omega`) (b) less than `1 Omega` (but approximately `1 Omega`) Explanation: When RESISTORS are connected in parallel. the EQUIVALENT resistance is less than the least resistance (here in both the cases it is 1 `Omega`) connected in the COMBINATION. Here, `R_1 = 1Omega, R_2 = 10^3 Omega and R_3 =10^6 Omega` The equivalent resistance `R_p`of the parallel combination is given by, `1/R_p = 1/R_1 + 1/R_2 +1/R_3` `= 1/1 + 1/1000 + 1/1000000` `= (1000000 +1000 +1)/(1000000)` `= 1001001/(1000000)` `:. R_p =1000000/1001001 Omega` `~~ 1Omega` |
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| 8888. |
Assertion: An enormous amount of energy is released which is called stellar energy Reason : Fusion reaction that takes place in the cores of the Sun and other stars. |
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Answer» If both the assertion and the REASON are true and the reason is the correct explanation of the assertion. |
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| 8889. |
The pseudomonas bacteria are useful for cleaning the hydrocarbon and oil pollutants from soil and water. |
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| 8890. |
A bird builing nest ona tree feeds uponthe fishes in nearby pond. Whether this bird is part of both i.e., tree as well as pond ecosystem ? |
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Answer» Solution :i.Yes, the bird becomes the PART of both TREE and pond ecosystem. ii. Birds peched on trees feed UPON the fishes in the nearbypond and are thus a part of the pond ecosystem. iii. This bird builds its nest on a tree and hence is also a part of the tree ( terrestial) ecosystem. iv. The role of bird in pond ecosystem can be explained by the following food CHAIN `:` Pond ecosystem `:` `underset("(Producer)")("Algae")rarrunderset("(Primary consumer)")("SMALL fishes")rarrunderset("(Secondary consumer)")("Big fishes")rarr underset("(Tertiary consumer)")("Bird")` |
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| 8891. |
What is lateral inversion? Give an illustration. |
Answer» Solution :The light TRAVELLING from the LEFT side of an OBJECT is reflected straight back and appears to cmne from the RIGHT side of the image. In other words you see a ..mirror image. or lateral INVERSION of the original object. 
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| 8892. |
Inan electricmotor , whichof the followingremainsfixed and whichrotateswith the coil ? (i) Commutator(ii) Brush. |
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Answer» Solution :(i) COMMUTATOR ROTATES with the coil . (II) BRUSH reaminsfixed. |
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| 8893. |
An object kept 60 cm from a lens gives a virtual image 20 cm in front of the lens. What is the focal length of the lens? Is it a converging lens or diverging lens? |
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Answer» Solution :GIVEN: Object distance (U) = 60 cm Image distance (v) = 20 cm (virtual image) To find: Focal length Type of lens Solution :`1/v - 1/u = 1/F ` `1/-20 - 1/-60 = 1/f ` `1/20 + 1/60 = 1/f ` `(-3 + 1)/(60) = 1/f` `(-2)/60 = 1/f` `-1/30 = 1/f ` f = -30 `therefore` Focal length = 30 cm Type of lens = DIVERGING - CONCAVE lens |
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| 8894. |
State the clock rule to determine the polarity of any face of a circular current-carrying loop |
Answer» Solution :If an observer looking atthe face of a circular loop FINDS the current to be FLOWING in the anticlockwise DIRECTION, the face of the coil behaves likethe NORTH pole. If the current is flowingin the CLOCKWISE direction, the face of the coil behaves like the southpole.
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| 8895. |
Bioremediation is |
| Answer» Solution :The PROCESS of using EITHER NATURALLY occurring or intentionally introduced MICRO organisms to consume and break down environmental pollutants, for cleaning a polluted site. | |
| 8896. |
Which radioactive material is present in the ore of pitchblende? |
| Answer» SOLUTION :URANIUM is the radioactive material is present in the ORE of PITCHBLENDE. | |
| 8897. |
Give any twouses of an electromagnet. |
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Answer» Solution :(1) In electricbells . (2) For separatingmagneticsubstance suchas iron and othersubstancehavingmagneticproperty froma METALLIC SCRAP. (3) Inhospitals , DOCTORS use it toremovepraticleof ironor STEEL from a pattent.s eye. |
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| 8898. |
(i) Draw a schematic diagram of a circuit consisting of a battery of five 2V cells, a5 Omega resistor, a10 Omega resistor and a 15 Omega resistor and a plug key all connected in series. (ii) Calculate the electric current passing through the above circuit when the key is closed. (iii) Potential difference across 15 Omega resistor. |
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Answer» Solution :(i) The SCHEMATIC diagram is GIVEN in Fig.12.34. (ii) Here total voltage `V= 5 times 2=10V` and total resistance `R=R_1+R_2+R_3` `=5+10+15=30 Omega` `THEREFORE` Current PASSING through the circuit when the key is closed. `I=V/R=(10V)/(30 Omega)=1/3 A=0.33A` (iii) Potential difference across resistor `R_3` of `15 Omega` `V_3=IR_3=1/3 times 15=5V` 
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| 8899. |
The number of alpha" and "beta-prticles emitted in the nuclear rection ""_(90)Th^(228) to ""_(83)Bi^(212). |
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Answer» SOLUTION : `""_(90)th^(228) overset(4 alpha)to ""_(82)Xi^(212)+ x XX He^(4)` `""_(82)X^(212) overset(beta) to ""_(83)Bi^(212) + y""_(-1)e^(0)` Number of decay, x = 4 Number of B decay, y = 1 |
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| 8900. |
What type of changes occurs in a home having chronically il old person ? How will you help to maintain good atmosphere ? |
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Answer» SOLUTION :(i) The quality of life of family member as well as of chronically ill old person can be hugly REDUCED in terms of physical, phychological and social PROBLEMS. (ii) Family members experence emotiona such as worry, frestration and stress. (iii) The work life of family members is affected. (iv) The family has to bear twith the behavioral disturbhances in the patient. (v) There is fanancial pressure on the family due to medical expenses. (vi) Meeting socialk workers, rehabilitaion therapists, and physicians regularly can help the family members totake care fo the ill old person. (vii) TAKING care, talking with the old person counselling the family members will bnot only ease his/her suffering but also help in MEIN taining good atmosphere at home. |
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