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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.
| 1451. |
What are the advantages of solar energy? Also mention its limitations. Explain with examples. |
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Answer» Solution :I. Advantages : (1) While generating the power through solar radiations, no fuel is burnt. (2) Solar ENERGY generation thus does not create any type of pollution. The technology can be completely utilized in regions with abundant sunlight. (3) Solar energy is eco-friendly, green energy. II Limitations : (1) Sunlight is available only during day time. Thus solar cells can generate power only during day. (2) In rainy season and in cloudy CONDITIONS, solar power generation suffers. (3) The power present in the solar cells is DC while most of the domestic equipments work on AC. |
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| 1452. |
Notochord. |
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Answer» Solution :(1) Notochord is an important feature of Chordates. (2) Notochord is supporting rod LIKE structure. (3) This structure is present on the dorsal side of the animals. (4) It keeps the nervous tissue separated from the rest of the tissues. (5) In Hemichordates, the notochord is present in the tail region of the free swimming larvae. (6) In Urochordates, the notochord is present in the tail region of the free swimming larvae. (7) In Cephalochordates, the notochord lies throughout the length of the BODY. (8) In VERTEBRATES, notochord is replaced by the VERTEBRAL column. |
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| 1453. |
A body cannot have a |
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Answer» ZERO speed and non-zero ACCELERATION |
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| 1454. |
A person suffering from myopia (near-sightedness) was advised to wear corrective lens of power - 2.5 D. A spherical lens of same focal length was taken in the laboratory. At what distance should a student place an object from this lens so that it forms an image at a distance of 10 cm from the lens ? |
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Answer» Solution :Power of lens P = - 2.5 `therefore`Focal length of lens f = `(1)/(p)=(1)/(2.5)= - 0.40 m = - 40 cm` Let the object be PLACED at a distance u in FRONT of the given lens so that its image is formed at a distance v = 10 cm from the lens. Since the lens is a diverging (concave) lens, as per signconvention, u, v as well as f have -ve sign. HENCE, as per lens formula `(1)/(v)-(1)/(u)=(1)/(f )` we have `RARR u=-40/3 cm =-13.3 cm ` So object should be placed at a distance of 13.3 cm from the lens. |
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| 1455. |
Regelation : |
| Answer» SOLUTION :The phenomenon in which the ice CONVERTS to liquid DUE to APPLIED PRESSURE and then re-converts to ice once the pressure is removed is called regelation. | |
| 1456. |
Resurgence, Preparedness, Response, Restoration |
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Answer» Solution :Preparedness It is a phase of disaster MANAGEMENT which takes place before a disaster, whereas the REST are PHASES that take place after a disaster has OCCURRED. |
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| 1457. |
Define resistance. Give its SI unit? |
| Answer» SOLUTION :RESISTANCE of a conductor is the measure of opposition offered by it for the FLOW of electric charge through it. SI UNIT of resistance is .ohm. (`Omega)` | |
| 1458. |
Explain details on heppenings about blue whale game. |
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Answer» Solution :1. The blue whale GAME reportedly consists of a series of takes assigned to players by administators over a 50-day period, with the final challenge REQUIRED the player to commit suicide. 2. Throughout 2017, media in In reported several cases of sucide, self-harm and attempted suicide alleged to be a result of the Blue whale game. The3 supreme COURT asked the Indian Central Government to ban TH game. Indian government directed internet majors GOOGLE, Facebook, WhatsApp, Instagram, Micosoft and Yahoo to erase the game's link. |
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| 1459. |
Hermaphrodite |
| Answer» SOLUTION :The CONDITION in which male and female reproductive organs are PRESENT in one and the same BODY. | |
| 1460. |
Briefly describe an experimental arrangement for observing scattering of light in colloidal solution. |
Answer» Solution :To observe scattering of light we set up an experimental arrangemernt shown here. S is a source of white light situated at the principal FOCUS of a convex lens L so that after refraction through `L_(1)` the light beam becomes a parallel beam of light. This light beam passes through a transparent glass tank 7 containing clear water. Emergent beam of light passes through a CIRCULAR hole Cmade in a cardboard sheet. A convex lens `L_(2)` forms a sharp image of the circular hole on a screen MN.  Now dissolve about 200g of sodium thiosulphate (COMMONLY known as hypo) in about 2 litre of clean water taken in the tank T. Add 1 -2 mL of concentrated sulphuric acid to the water. We observe fine microscopic sulphur particles precipitating in about 2-3 minutes. As the colloidal sulphur particles begin to form, we observe the blue light from the THREE sides of the glass tank. It is due to scattering of blue light of short wavelengths by colloidal sulphur particles. Consequently, the TRANSMITTED light through the tank, which is finally focussed on screen MN, at first appears of orange-red colour and then of bright crimson red colour. |
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| 1461. |
The resistance of a ralstor Is kept constant and the potential difference across its two ends is decreased to half of its former value. State the change that will occur in the current through it. |
| Answer» SOLUTION : CURRENT will be HALF of its FORMER VALUE. | |
| 1462. |
Can you produce sound without vibration in the body? |
| Answer» Solution :We cannot produce SOUND WITHOUT VIBRATION in the BODY. | |
| 1463. |
Find the effective resistance between the points A and B in the network shown In the figure. |
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Answer» Solution :Resistance `R_(1) = 2Omega, R_(2) = 6 OMEGA` and `R_(3) = 3 Omega` `= R_(2) ` and `R_(3)` are in PARALLEL combination `(1)/(R_(4))=(1)/(R_(2))+(1)/(R_(3))=(1)/(6) +(1)/(3)` `= (1+2)/(6) = (3)/(6)=(1)/(2) Omega` `R_(4) = 2 Omega` Resistance `R_(1)` and `R_(4)` are in series combination `R_(EQ)= R_(1) + R_(4)` = 2+2= `4OMEGA` |
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| 1464. |
Where are sacred groves frond in Maharashtra ?Make a list and visit with you teachers. |
| Answer» Solution :Sacred GROVES in Maharashtra are located in districts like Ahmednagar, BHANDARA,CHANDRAPUR, Jalgaon, Sangli, Satara,Sindhudurg, THANE, Yavatmal. | |
| 1465. |
A train passes over a 400m long bridge. If the speed of the traIN IS 30M/S and the train takes 20 s to cross the brigde , then the length of the train is |
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Answer» 400 m `:. (400+l)/(30)`=20 or l = `20xx30-400` =200M |
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| 1466. |
One word is incorrect in the statement . Change it to make the statement correct : Coelenterate animals have special type of collar cells . |
| Answer» SOLUTION :Coelenterate ANIMALS have SPECIAL type of cnidoblasts or Porifera animals havespecial TYPES of collar cells . | |
| 1467. |
State Kirchhoff's Loop law. |
| Answer» SOLUTION :The algebraic SUM of the increase and decrease in potential difference across VARIOUS components of the circuit in a CLOSED circuit loop must be zero. | |
| 1468. |
What is a wind energy farm ? |
| Answer» SOLUTION :A NUMBER of WINDMILLS erected over a LARGE AREA. | |
| 1469. |
What is aqueous solution: |
| Answer» Solution :The solution in which water ACT as a solvent is CALLED aqueous solution. In GENERAL, ionic compounds are soluble in water and form aqueous solutions more readily than covalent compounds. E.g. COMMON SALT in water. | |
| 1470. |
A solutionis a______ mixture. |
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Answer» HOMOGENEOUS |
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| 1471. |
Find the direction of magnetic field due to a current carrying circular coil held : (i) Vertically in North-South plane and an observer looking it from east sees the current to flow in anti clockwise direction. (ii) Vertically in East-West plane and an observer looking it from south sees the current to flow in anti clockwise direction. (iii) Horizontally and an observer looking at it from below sees current to flow in clockwise direction. |
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Answer» Solution : (i) TOWARDS SOUTH in upward DIRECTION. (II) Towards west in upward direction. (iii) Towards upward direction. |
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| 1472. |
Radiations from cell phones : Headache : : ……. : Hindrance to the brain development. |
| Answer» SOLUTION :ALCOHOLISM | |
| 1473. |
You must have come across the three R's to save the environment : Reduce, Recycle and Reuse. Explain Reuse in detail. |
| Answer» Solution :REUSE, This is the better than RECYCLING because recycling requires time, labour energy , and money. In the .reuse. strategy. We use THINGS more than once. For example we have envelops and carrybags which can be used again and again. Envelops can be REUSED by reversing them. The plastic bottles and CONTAINERS in which we buy various food items can be reused for stroring things in the kitchen. | |
| 1474. |
From a uniform disc of radius R, a circular discof radius R//2 is cut out. The centre of the hole is R/2 from the center of disc. Locate the centre of gravity of the resultant flat body. |
| Answer» Solution :COM of RESULTING PORTION LIES at `R//6` from the centre of the original disc in a direction opposite to the centre of the CUT out portion. | |
| 1475. |
Circuit Breaker Device which can be used in place of fuse in domestic electric wiring is called : |
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Answer» CBD |
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| 1476. |
You are given a concave mirror, plane mirror anda convex mirror. How can you distinguish between them by just looking your face in them. State the common nature of the image that you see in all of them. |
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Answer» SOLUTION :(i) Image is of same size in PLANE mirror. (ii) Image is enlarged in CONCAVE mirror. (iii) Image is diminished in CONVEX mirror. (iv) Image in all the three is VIRTUAL. |
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| 1477. |
The SI unit for the resultant velocity is |
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Answer» m/s |
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| 1478. |
Which of the following shows velocity (v) - time (t) graph for falling apple? |
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Answer»
During the free fall, a= +G It implies thatconstant VELOCITY INCREASES with time at a constant rate. So, (d) is the CORRECT graph. |
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| 1479. |
You are spending more time in internet / mobile games, phone, etc. |
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Answer» Solution :(i) Various physincal problems like tiredness, headache, insomnia, FORGETFULNESS tinnitius, joint pains and probles in vision may arise due to radiations of cfell phone. (II) These radiations penetrete the bones of children more effectively than bones of adults. (iii) Hence, I will make a conscious attempt to not spend more time in INTERNET / MOBILE phones, games etc. I will cultricvate some good hobby or games etc. I will cultivate some good hobby or play SPORTS and concentrate on my studies. (iv) I will even meditate to get rid of internet addiction. |
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| 1480. |
Define potential difference between two points in a conductor. |
| Answer» Solution :Potential differene between two points A and B, in an electric field, is DEFINED as the amount of work DONE in ORDER to move unit POSITIVE charge from point B to point A. | |
| 1481. |
It is absolutely necessary to control the fission reaction in nuclear power plants. |
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Answer» Solution :(i)NUCLEAR power plants work on the PRINCIPLE of controlled chain reaction. (ii) When slow moving neutrons strike the uranium nucleus, it splits into Barium and Krypton with release of three neutrons and tremendous AMOUNT of energy (200 MeV). (iii) Three neutrons strike on three more uranium nucleus and fission continues creating tremendous energy which is harmful. (iv) Reaction is controlled by USING neutron absorbent material like boron steel and cadmium rods which absorb EXCESS neutrons and heat generated can be used for welfare of mankind. (v) Hence, it is absolutely necessary to control the fission reaction in nuclear power plants. |
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| 1482. |
Energy can be produced when two lighter nuclei combine to form a heavier nucleus is called as__________. |
| Answer» SOLUTION :NUCLEAR FUSION | |
| 1483. |
The work done by (or on ) a gas per mole per kelvin is called |
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Answer» UNIVERSAL GAS constant |
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| 1484. |
Which coloured insulation cover is used forearthing wire ? |
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Answer» Red |
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| 1485. |
State the structure of iris and its function in human eye. |
| Answer» Solution :Just behind the cornea is a dark COLOURED MUSCULAR diaphragm which has a small circular opening in the middle. Iris is MADE of MUSCLES. They control the size of opening of pupil. | |
| 1486. |
If the angle of incidence and angle of emergence of a light ray falling on a glass slab are I and e respectively, prove that,i=e. |
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Answer» Solution :As shown in the figure a ray of light AN is incident on glass and gets REFRACTED. 1. The FIRST refraction OCCURS when light ray enters the glass from air at N on the side PQ. The second refractionoccurs when light enters air through glass at point M on the side SR. The emergent ray is MD. For the first refraction usingSnell's LAW `n_(1) "sin" i=n_(2)` sin r ....(i) 2. Where `n_(1)` is the refractive index of first medium (air) and `n_(2)` is the refractive index of second medium (glass) 3. For the second refraction using Snell's Law `n_(2) "sin" i_(1)=n_(2)` sin e ... (ii) But `i_(1)=r` 4. `n_(2) "sin" r=n_(1)` sin e `""`... (iii) From (i) and (iii) `n_(1) "sin" i=n_(1)` sin e , sin i=sin e Comparing both sides i=e 
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| 1487. |
If the number of molecule in a container is doubled. What will be the effect on the rms speed of the molecules? |
| Answer» SOLUTION :No EFFECT | |
| 1488. |
How did the 'Chipko Andolan' ultimately benefit the local population? Give any two benefits. |
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Answer» Solution :BENEFITS of Chipko Andolan. 1. Forests are essential for the protection of ENVIRONMENT. 2. The leaders of Chipko Andolan believed in five F.s - FOOD, Fodder, Fuel, FERTILIZERS and Fibres provided by the forests. |
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| 1489. |
Try this. Make a list of students in your class using spectacles. Record the power of their lenses. Find out and note which type of defect of vision they suffer from. Which defect is most common among the students? |
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Answer» Solution :`{:("Name of the STUDENT","Power of spectacles " , "Defect"),(,,):}` The power of the lenses should be noted down ALONG with its sign. This sign (positive or negative) of the power HELPS in determining the type of defect of vision the student is suffering from. If the power of the lens is negative, the lens used is CONCAVE i.e., the student is suffering from nearsightedness. If the power of the lens is positive the lens used is convex i.e., the student is suffering from farsightedness. The most common defect among the students ts nearsightedness or myopia. |
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| 1490. |
A glass slab is placed over a piece of paper on which VIBGYOR is printed with each letter into its corresponding colour. (i) Will the image of all the letters be in the same place? (ii) The letter of which colour will appear to be raised (a) maximum, and (b) minimum ? Explain your answer. |
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Answer» Solution :(i) No. the image of all the letters will not be in the same place. (II) (a) The LETTER of violet COLOUR (i.e., V) appears to be RAISED maximum. (b) The letter of red colour (i.e., R) appears to be raised minimum Reason: Apparent depth=`("real depth")/("refractive index")` and refractive index of glass is most for violet light while least for red light, therefore the apparent depth is least for the violet letter and most for the red letter. |
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| 1491. |
How are we able to see nearby and also the distant objects clearly? |
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Answer» Solution :Power of accommodation of human eye : The ability of eye lens to adjust its FOCAL length to form the sharp image of the OBJECT at varying distance on the retina is called its power of accommodation. The curvature of eye lens can be changed (i.e. change in its focal length) to some extent by the ciliary muscles. When we are looking at the nearby objects, the ciliary muscles contract, it INCREASES the thickness of eye lens. The eye lens then becomes thicker. As a result, the focal length of eye lens decreases in such a way that the clear sharp image of nearby object is formed on the retina. Thus, the object is seen clearly to us. When we are looking at the distant objects, these muscles are in RELAXED position, the eye lens becomes thinner, focal length of the lens increases. THEREFORE, the parallel rays coming from the distant object are focussed on the retina and object is seen clearly to us. Thus, the accommodation power of an eye helps a person to see nearby as well as distant objects clearly. |
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| 1492. |
A student want to project the image of a candle flame on the walls of school laboratory by using a lens : (a) Which type of lens should he use and why ? (b) At what distance in terms of focal length 'f' of the lens should he place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall ? Draw ray diagram to show the formation of the image in each case. |
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Answer» Solution :(a) The STUDENT should use a convex lens because only a convex lens can FORM a real image of the candle flame which can be obtained on the wall of school LABORATORY. (B) (i) The candle should be placed at a distance d, where `f lt d lt 2f`, to obtain a magnified image on the wall. Ray diagram is shown in FIGURE. (ii) The candle should be at a distance `d gt 2f` to obtain a diminished image of the candle on the wall. |
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| 1493. |
Convex mirrors are used as rear view mirrors |
| Answer» Solution :Convex mirrors are used as REAR VIEW mirrors because the IMAGE is smaller, more image can fit ONTO the mirror, it provides for a larger field of view than a plane mirror. They are used whenever a mirror with a large field of view is needed. | |
| 1494. |
Excessive consumption of alcohol leads to ............. |
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Answer» Loss of memory |
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| 1495. |
Define power of a lens. Give its S.I unit? |
| Answer» Solution :Power ofa lens is the ability of a ions to converge ·or diverge an INCIDENT ray of light. It is DEFINED as the reciprocal of its FOCAL length d = [1/f (m)] DIOPTRE Its SI unit is Dioptre. | |
| 1496. |
The wave-like character was experimentally proved for light by |
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Answer» Newton |
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| 1497. |
What are the limitations of the energy that can be obtained from the oceans? |
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Answer» Solution :The forms of ENERGY OBTAINED from the ocean are tidal energy wave energy, and ocean thermal energy. There are several limitations to harness these energies. (i) dal energy depends on the relative positioning of the earth, moon, and the sun. (ii) High dams are REQUIRED to be built to convert tidal energy into electricity. (III) Very strong WAVES are required to obtain electricity from wave energy. (iv) To harness ocean thermal energy effliciently, the difference in the temperature of surface water [hot) and the water at depth [cold] must be `20^(@)` C or more. |
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| 1498. |
Two bodiesof different masses are allowed to fall freely from the same height , then both the bodiesreach the Earth together . |
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Answer» |
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| 1499. |
Ships are made based on the principle of……………… |
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Answer» pressure |
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| 1500. |
Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. If a current carrying coil has n turns, why is the field produced at any point n times the field produced by a single turn ? |
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Answer» Solution :A CIRCULAR LOOP formed by bending a straight conductormay be imagined as many small pieces of straight wires. Eachof thesepieces produces a magnetic field in theform of concentric circles of increasing radius centred aroundthe WIRE. At the CENTRE of thecircular loop, the arcs of these bigcircles would appearas straight LINES. The right-hand thumb rule shows that every section of the wire contributesto themagnetic fieldlines in the same direction withinthe loop. 
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