InterviewSolution
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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.
| 7501. |
In partial reflection for a particular value of I, the value of r become equal to ……….. |
| Answer» SOLUTION :`90^(@)` | |
| 7502. |
The reactionof ironnailwithcoppersulphatesolutionis ________ reaction . |
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Answer» COMBINATION |
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| 7503. |
In optical fibre, which of the following principles is used? |
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Answer» SCATTERING |
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| 7504. |
List any four changes you would like to incorporate in your lifestyle in a move towards a sustainable use of available resources in our country . |
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Answer» Solution :(i)Save electricity by switching off unnecessary lights and fans. (II)Reuse of used envelopes , plastic bottles. (iii)Opt for CARPOOL. (IV)CYCLING to school. |
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| 7505. |
Show how you would connect three resistors, each of resistance 6Omega so that combination has a resistance of (i) 9Omega (ii) 4Omega |
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Answer» Solution :i] For getting a resistance of `9Omega`, the two resistors should be connected in parallel and ONE in series with them. The equivalent resistance of the two resistors in parallel, `R_(p)` is GIVEN by `1/R_(p)=1/6+1/6=2/6toR_(p)=3Omega` Now, the equivalent resistance of `R_(P)and6Omega` in series is given by DIAGRAM. `R=R_(p)+6=3+6=9Omega`.  ii] To GET a resistance of `4Omega`, two resistors should be connected in series and one in parallel to them. The equivalent resistance of the two resistors in series is given by `R_(p)=6Omega+6Omega=12Omega` Now, the equivalent resistance of `R_(p)and6Omega` in parallel is given by diagram. `1/R=1/R_(p)+1/6=2/6+1/6=(1+2)/12=3/12=1/4` `R=4Omega` 
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| 7506. |
A small bulb is placed at the principal focus of a convex lens. When the bulb is switched on, the lens will produce. |
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Answer» a CONVERGENT beam of light |
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| 7507. |
Mention any three differences between convex mirror and concave mirror. |
| Answer» Solution :`{:("Convex mirror","CONCAVE mirror"),("Its reflecting surface is away from the CENTER of curvature.","It reflecting surface is TOWARDS the center of curvature."),("Center of curvature lies behind the mirror.","Center of curvature lies in front of the mirror."),("It is a diverging mirror - diverges the incident light rays.","It is a converging mirror - CONVERGES te incident light rays."),("Forms virtual images.","Forms real as well as virtual images."),("Used as rear view mirrors in automobiles, security mirrors in shops and homes, etc.","Used as reflectors in projectors, searchlights, headlights of vehicles, dentist mirrors, MAKE up mirrors, solar furnaces, etc."):}` | |
| 7508. |
Oersted : electromagnetism :: ____________ : law of electromagnetic induction and laws of electrolysis. |
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Answer» Solution :MICHAEL Faraday Oersted played an important ROLE in understanding electromagnetism WHEREAS Michael. Faraday discovered the law of electromagnetic induction and laws of ELECTROLYSIS. |
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| 7509. |
(i) What is mean by reflection of sound? |
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Answer» SOLUTION :When sound waves travel in a given medium and strike the surface of another medium, it can be bounced back into the FIRST medium is called as reflection (ii) Explain the REFRACTION at the boundary of a rarer and denser medium? (a) Reflection in rarer medium • Consider a wave travelling in a solid medium striking on the interface between the solid and the air. • The compression exerts a force F on the surface of the rarer medium. • As a rarer medium has smaller resistance for any deformation, the surface of separation is pushed backwards. . As the particle of the rarer medium are free to move, a rarefaction is produced at the interface. THUS, a compression is reflected as a rarefaction and the RARE faction travels from right to left. (b) Reflection in denser medium: Incident Wave • A longitudinal wave travels in a medium in the · form of compressions and rarefactions. • Suppose a compression travelling in air from left to right reaches a rigid wall. • In turn, the wall exerts an equal and opposite reaction R--Fon the air molecules. This results in a compression near the rigid wall. • Thus, a compression travelling towards the rigid wall is reflected back as a compression. That is the direction of compression is reversed. 
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| 7510. |
List the three kinds of blood vessels of human cirululatory system and write their functions. |
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Answer» SOLUTION :i) Arteries. They carry blood away from the heart to various organs of the body. ii) Veins : They collect the blood from different organ and bring it BACK to the heart. iii) CAPILLARIES : Exchanges of material between the blood and surrounding CELLS takes place across the THIN walls of capillaries. |
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| 7511. |
How are the wastes produced in nuclear power plant different from those produced in a thermal power plant ? What happens to the waste of a nuclear power plant? |
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Answer» Solution :The waste obtained from nuclear power plants is highly radioactive in nature which EMITS harmful radiations, Where as waste produced in a THERMAL power PLANT is non- radioactive. Management of nuclear waste is given as follows: • Some products of nuclear waste are buried in sealed steel lead containers for a long term storage, buried under the ground or DUMPED in vocated COAL mines. • Other waste products transfer into less harmful products transform into less harmful products or to production with a shorter half life. |
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| 7512. |
Two lamps one rated 100W at 220V, and the other 60W at 220V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220V? |
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Answer» Solution :CURRENT drawn by 1ST lamp rated 100W at 220V `I_1=P_1/V=100/220=5/11A` and current drawn by 2nd lamp rated 60W at 220V `I_2=P_2/V=60/220=3/11A` In PARALLEL arrangement the total current `I=I_1+I_2=5/11+3/11+8/11A=0.73A` 
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| 7513. |
How can you decide the focal length of the lens to be used to correct myopia ? |
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Answer» Solution :Let the OBJECT DISTANCE (u) is infinity and image distance (v) is equal to distance of far point `u = -oo,v` = distance of far point = -D Let 'F' be the focal length of bi-concave LENS. Using lens formula ,` 1/f =1/v -1/u implies1/f =1/(-D) impliesf=-D` Here 'f' is negative for a concave lens. |
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| 7514. |
Person suffering from cataract has |
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Answer» elongated eyeball. |
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| 7516. |
When an object is placed infront ofa sphedcal mirror at a distance 30 cm, the magnification is -1. What kind of mirror is this? |
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Answer» |
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| 7517. |
Choose the odd one out : Change in value 'g' at surface, change in value of g at height, change in value of g at depth, change in value of g on thickness. |
| Answer» SOLUTION :Change in VALUE of g on THICKNESS. Others are related FACTORS to the value of g. | |
| 7518. |
If you could any source of energy for heating your food, which one would you use and why ? |
| Answer» Solution :We would use a MICROWAVE oven for HEATING the FOOD it HEATS uniformly and CLEARLY without any loss in its nutritional value . | |
| 7519. |
How is plaster of paris prepared? What reaction takes place when it sets to a hard mass. b) Explain the general properties of bases |
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Answer» SOLUTION :Plaster of paris is prepared by heating gypsum to a temperature of `100 ^(@) C`. The following reaction takes place: `CaSO_(4). 2H_(2)O to CaSO_(4). (1)/(2) H_(2)+ 1(1)/(2)H_(2)` On mixing with water it retracts to a hard mass to form gypsum again i.e., the reverse reaction takes place. b) * Bases possess a bitter taste * Bases are slippery to touch. *Bases turn red LITMUS blue Bases turn phenolpthalein solution pink *Strong base like caustic SODA (NaoH) caustic potash (KOH) are corrosive in nature and PRODUCE burning sensation on the skin *Solution of bases in water conduct electricity *Bases react with acid, neutralise them. *Producing salt and water. |
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| 7520. |
OVARY |
| Answer» SOLUTION :PRODUCTION of OOCYTES and FEMALE hormones-estrogen and PROGESTERONE. | |
| 7522. |
Why are geostationary satellites not useful for studies of polar region? |
| Answer» SOLUTION :The geostationary satellites orbit above the equator. These are, therefore, not USEFUL in the STUDY of polar regions. | |
| 7523. |
The medium having same chemical properties in all directions is called |
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Answer» ISOTROPIC MEDIUM |
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| 7524. |
Define kW h. |
| Answer» Solution :A KILOWATT hour (k WH) is the energy consumed when 1kW (1000 W) POWER is used for 1 hour. | |
| 7525. |
400 J of heat is produced in 4 s in a 4.0ohm resistor. Find the potential difference across the resistor. |
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Answer» SOLUTION :Here, H = 400 J `:. (V^2t)/R = 400` `:. V^2 = 400 XX R/t = 400 xx 4/4= 400` `:. V = 20 "volts"` |
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| 7526. |
What is a solenoid ? Draw magnetic field lines due to a current-carrying solenoid. Write three important features of the magnetic field obtained. |
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Answer» Solution :A solenoid is a COIL of large number of circular turns of wire wrapped in the shape of a cylinder. On passing electric current, a magnetic field is developed. Magnetic field lines are drawn below. The field is along the AXIS of solenoid such that one END of solenoid behaves as north POLE and the other south pole. Thus, field of a solenoid is similar to that of a bar magnet Important features of magnetic field due to a currentcarrying solenoid are: (i) Mgneticfield linesinsidethe solenoid are nearly straightand parallel to its axis. It shows thatmagnetic fieldinsidea solenoidis uniform. (ii) Magnetic field of solenoid isidentical to thatdue to a barmagnet with one endof solenoidbehavingas a north pole and otherend as south pole . (iii) A current- carryingsolenoidexhibitsthedirectiveandattractiveproperties of a bar magnet. 
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| 7527. |
Why do elements form chemical bonds ? |
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Answer» Solution :1) Elements are unstable if they CONTAIN less than EIGHT electrons in their valency SHELL. 2) Hence, theyform chemical bond with other elements to get octet in their valency shell. |
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| 7528. |
Meena draws magnetic field lines of field close to the axis of a current-carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging. How will you explain her observation? |
| Answer» SOLUTION :STRENGTH of the magnetic field falls as DISTANCE increases. This is indicated by the DECREASE in degree of closeness of the LINES of field. | |
| 7529. |
You may have noticed that side rear view mirrors on vehicles say ''Objects seen in the mirror are closer than they appear''. Why is this message etched on the side mirror ? |
| Answer» Solution :Side - view mirrors are convex mirrors. Convex mirrors form diminished, ERECT images. GENERALLY objects which are very far away appears small to us. But in a convex mirror, the field of view is more and image of the objects APPEAR small. A person DRIVING shouldn.t misjudge the distance of the vehicles BEHIND. | |
| 7530. |
The linear magnification produced by a spherical mirror is +3. Analyse this vale and state the (i) type of mirror and (ii) Position of the object with respect to the pole of the mirror. Draw ray diagram to show the formation of image in this case. |
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Answer» SOLUTION :(i) Concave MIRROR (II) Between the pole and FOCUS 
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| 7531. |
Disaster Management Authority. |
| Answer» Solution :Disaster Management Authority is the body that works at the level of government from national level to VILLAGE level. This WORK is BASICALLY about management of any disaster and tackling the problems of the affected people. At National level there is National Disaster Management Authority for which the Prime Mini.ster is the chairman. For every state there is State Disaster Management Authority, where the CHIEF minister of every state is the chairman, Under the state level, there are district level units where district collector is resposible for disaster management and implementation of rehabilitation schemes. Below district level authoritythere are Taluka and then Village Disaster Management Committees. The Tahsildar is the chairman for Taluka level while the Sarpanch of the village is resonsible for management of disasters at village level. Collector of each district helps in planning, coordinating and controlling the implementation of rehabilitation programme and also gives essential instructions and reviews the entire system. | |
| 7532. |
At what temperature does all molecular motion cease? |
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Answer» SOLUTION : If MOLECULAR motion CEASES then ke become zero and absolute scale of TEMPERATURE is directly proportional to KE `:. T prop KE` `mu KE=0 "" T=0K` So at 0 KELVIN temperature motion of all molecules ceases. |
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| 7533. |
Project: Make a Power point presentation about the construction and use of binoculars. |
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Answer» Solution :Binoculars are actually two telescopes connected side-by-side used to view from both the eyes. Depending on the optical devices used, binoculars are of different types: Galilean binoculars, Prism binoculars, Keplerian binoculars etc. Construction: Basic parts of binoculars are optical devices, central focusing arrangement, hinge and axle system for adjustment of distance from the eyes. The optical devices used in the above mentioned binoculars are: i. Galilean binoculars: These consist of a convex objective lens and a concave eyepiece. ii. Prism binoculars: These consist of two right ANGLED prisms and work on the principle of total internal reflection. iii. Keplerian binoculars: These consist of convex lenses for both objective and eyepiece. USES: Binoculars are used to view DISTANT objects CLEARER and closer. Hence, few of their uses are: i. In military operations to keep watch on the enemy. ii. In sports to enjoy the play even from the far away distance. iii. At tourists SPOTS to observe the distant views of the valley. iv. For bird watching. |
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| 7534. |
Heat brings ............ change. |
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Answer» physical |
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| 7535. |
Cockroach , Butterfly , Spider , Honey bee |
| Answer» Solution :Spider . (Spider is EIGHT - legged ARACHNID , REMAINING are INSECTS .) | |
| 7536. |
In man, there are _________ of cranial nerves. |
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Answer» 31 |
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| 7537. |
A gas storage tank has a small leak. The pressure in the tank drop more quickly if the gas is hydrogen than if it is oxygen. Why ? |
| Answer» Solution :RATE of diffusion of a gas is inversely proportional to the square ROOT of the DENSITY. So HYDROGEN leaked out more rapidly. | |
| 7538. |
Facilities like roads and water supply are restored in ............. phase. |
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Answer» |
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| 7539. |
A student while studying the force experienced by a current carrying conductor in a magnetic field records the following observations: (i) The force experienced by theconductor increases as the current is increased. (ii) The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observationsis correct and why? |
| Answer» Solution :OBSERVATION (i) is correct as the force EXPERIENCED by the current CARRYING conductor is directlyproportional to magnitude of the current PASSING through the conductor. | |
| 7540. |
Out of 60W and 40W lamps, which one has a higher electrical resistance when in use? |
| Answer» SOLUTION :40W lamp has a higher ELECTRICAL resistance because `R=V^2/P` | |
| 7541. |
Explain in detail the various important factors to be considered with respect to the scope of disaster. |
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Answer» Solution :the nature and scope of disaster includes the following phases: i. Pre disaster phase: In this phase, the areas which are prone to disaster are recognised and kept ready for evacuation in case of emergency. ii. Warning phase: If there are any signals or hints of an upcomig disaster, appropriate warnings are issued by the authrities to the general public. iii. Emergency phase: a. This phase deals wiht the actual strike of disaster, wherein rescue operations begin immediately and attempt is made to save MAXIMUM number of lives. b. Actions LIKE search and rescue operations, first aid, medical assistance, restoring communication services, removing the people from affected area are important aspects of this phase. iv. REHABILITATION phase: a. This phase begins after the subsidence of the disaster and includes actions like clearing of debris, restoring water supply, repairing roads, etc. b. It involves bringingnormalcy in the lives of people and soothing their mental stress at the earliest. c. Various institutes offer monetary and other type of HELP, including permanent means of earning livelihood to the victims and their family members. v. Recovery phase: a. After rehabilitation, the affected people try to recover from the loss and get back to their dialy life. b. Although this phase does not actually include reconstruction of amenities, it brigns a positive outlook in people. vi. Reconstruction phase: This phase is a continuation of the earlier two phases aned deals with reconstructionof BUILDINGS, restoration of facilities like roads and water supply and also restarting farming practices. This phase generally takes a long time. |
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| 7542. |
Name the two kinds of natural exhaustible resources ? |
| Answer» SOLUTION :RENEWABLE and non-renewable. | |
| 7543. |
Complete the ray diagrams by drawing the incident ray or the reflected ray for the following figures. |
Answer» SOLUTION :
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| 7544. |
(a) What do you mean by refractive index of one transparent medium with respect to another ? How is it related to absolute refractive indices of two media ? (b) Can absolute refractive index of a medium be less than one ? Given reason. |
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Answer» Solution :(a) When a light RAY is refracted from medium number 1 into medium number 2, the relative refractive index of MEIDUM 2 w.r.t. medium `1(n_(21))` is given by : `n_(21) = ("Speed of light in medium 1" (v_(1)))/("Speed of light in medium 2"(v_(2)))` It is found that `n_(21) = (v_(1))/(v_(2)) = (n_(2) "(absolute refractive index of medium 2)")/(n_(1) "(absolute refractive index of medium 1)")` (B) No, absolute refractive index of a medium cannot have a value less than one. It is because speed of light in any given medium cannot be greater than the speed of light in vaccum. |
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| 7546. |
Which factors affect the social health? |
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Answer» Solution :(1) In order to maintain the social health of any community there should be good amenities for the people. E.g. food, water, SHELTER, clothing, medicines and medical help, equal opportunities for education, cleanliness of the surroundings, transport facilities etc. should be properly provided. (2) The social and political conditions of the surrounding should be such that there should not be any connections with world of criminals. The presence of such criminal ties can affect the social health to a GREAT extent. (3) The gardens, playgrounds, the empty plots for outdoor games, sports clubs etc are important criteria for overall development of the society. This results into PERSONALITY development and make people happy and strong. (4) Addictions, criminal tendencies, pervert behaviour and PERVERSE THINKING affects other people in the society and this reflects negatively on the social health. (5) Having large number of friends and relatives, proper use of time when alone and when along the peer group, trust in others, respect and acceptance for others build stronger social health. |
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| 7547. |
The focal length of the concave mirror in the experimental set up, shown alongside, equals : |
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Answer» 10.3 cm |
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| 7548. |
State Faraday's law of induction. |
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Answer» SOLUTION :(i) Faraday's law of induction: Whenever the number of magnetic lines of force passing through a COIL changes, current is induced in the coil. (ii.) The current produced in the coil is CALLED the induced current. (iii.)When a rectangular conductor loop is brought NEAR a solenoid coil and if a current is switched on or off in the solenoid coil, current is induced in the loop. (iv.) Also, when the current in the solenoid coil is increased or DECREASED, current is induced in the loop. |
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| 7549. |
Distribute the 24 hours of your daily routine as per various duties you have obserbved. Make two catogories as time spent on your health and time spent on other responsibilities and compare both the categories. |
Answer» Solution :The DISTRIBUTION of 24 HOURS of the day routine should be as follows :  From the given time table we can conclude that we must SPEND EQUAL time for our health as wll as for other things. The time we spend for our health is as follows: Thus, we can SAY that out of 24 hours we spend 14 hours 15 minutes for our health. |
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| 7550. |
Temperature is the average ................ of the molecules of a substance |
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Answer» difference in K.E and P.E `:.`Temperature is equal to the AVERAGE KE of molecules. `:. KE= T.E-P.E` |
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