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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.
| 3301. |
Give scientific classification of shark upto class. |
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Answer» Solution :Kingdom : Animalia PHYLUM : Chordata Subphylum : Vertebrata Class : Pisces SUBCLASS : Elasmobranchi (Cartilaginous ) EXAMPLE : Scientific NAME : Scoliodon sorrakowah . Common name : Shark |
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| 3302. |
What is the effect theresistance in the circuit at the time of short - circuit ? |
| Answer» Solution :At the timeof short -CIRCUIT , the resistancein thecircuit becomesvery SMALL (nearly ZERO). | |
| 3303. |
Explain in detail radioactive pollution. |
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Answer» Solution :i.Radioactive pollution is the presence of radioactive substances in the environment. ii. The CAUSES of radioactive pollution are natural and artificial . iii. Natural radiations include UV and IR, whereas X-rays and radiations from atomic energy plants are types of artificial radiations. iv. The CHERNOBYL,Windscale and Three miles ISLANDS incidents, are the major incidents of radioactive pollution of the world. v. Radioactive pollution may result in cancerous ulceration due to exposure to high radiations of X-rays , destruction of tissures of the body , changes in genetic constitution , adverse effects on vision,etc. |
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| 3304. |
__________ is the phenomenon due to which light gets deflected and diffused all over as a result of its interplay with tiny matter particles. |
| Answer» SOLUTION :SCATTERING of LIGHT | |
| 3305. |
Explain the term functional group with an example. |
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Answer» Solution :The compound acquirespecific chemical properties due to these heteroatoms or the groups of atoms that contain hetero atoms, irrrespective of the LENGTH and NATURE of the carbon chain in that compound. Therefore these hetero atoms or the groups of atoms containing hetero atomsa are called functional groups. All organic compounds are derivatives of HYDROCARBONS. The derivatives are formed by replacing one or more H-atom/atoms ofhydrocarbon by some other hetero atom or groups of atoms containing hetero atoms. After replacement, a new compound is formed which has propertiesdifferent from the parent hydrocarbon. Examples : For methane, if one hydrogen atom is replaced by an -OH group, then a compound is methylalcohol `(CH_(3)OH)`. The -OH group isknown as the alcoholic functional group. Functional group is organic compound : 1. Alcohol : ` -OH` (hydroxy group) 2. Aldehyde : `-overset(H)overset("|")C=O` 3. Ketones : `-overset(O)overset("||")C-` 4. Carboxylic ACID :`-COOH` |
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| 3306. |
If two ml of dil. Acetic acid is added to a test tube containingpowdered sodium bicarbonate, What will you observe ? |
| Answer» SOLUTION :We will OBSERVE THATA gas is evolved with effervescence.This gas on PASSING through the lime water will turn it milky. So the evolved gas is `CO_(2)` gas. | |
| 3307. |
Draw a ray diagram to show refraction through a rectangular glass slab. How is the emergent ray related to incident ray ? What is its lateral displacement ? |
Answer» Solution :A ray diagram showing refraction through a RECTANGULAR glass slab has been shown in adjoining figure.  The emergent ray GH is exactly parallel to the incident ray EFNM. It MEANS that `angle r_(2) = angle i_(1)`. HOWEVER, the emergent ray is laterally (side ways) DISPLACED as compared to the original path of LIGHT ray. In ray diagram, the lateral displacement is GN. Its value increases on increasing the width of glass slab. |
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| 3308. |
A convex lens and a concave lens of unknown powers are given to you. The lens of higher power is |
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Answer» always convex |
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| 3309. |
If the earth is one half its present distance from the sun. How many days will be presents one year on the surface of earth will change? |
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Answer» Solution :`T_(1)= 365` days , `r_1=r, T_(2)= ?, r_2= r"/"2` `(T_(2)^(2))/(T_(1)^(2))=(r_(2)^(3))/(r_(1)^(3))` or `T_(2)=T_(1)*[(R_2)/(r_1)]^(3/2)` `=365[(r"/"2)/(r )]^(3/2)= 129` days. Therefore decrease in number of days in one YEAR will be `=365-129= 236` days. |
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| 3310. |
Reorganize the following food chain. Describe the ecosystem to which it belongs. Grasshopper rarrSnake rarrPaddy field rarr Eagle rarr Frog |
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Answer» Solution :The given food chain can be reorganized in the following MANNER `:` Paddy Field `rarr ` Grasshopper `rarr `Frog `rarr ` Snake `rarr `Eagle i. The given food chain belongs to cropland ecosystem. ii. This ecosystem is man-engineeredand artifically maintained by man by adding energy and planned manipulation. iii. MANMADE `//` artificial ecosystem is LESS complex as comparedto natural ecosystem. iv. This ecosystem relies on human efforts for its sustenance. Without human intervention and supervision,such man-made ecosystem will disintegrate. v. In the given ecosystem, paddy crops in the field are primary producers that obtain energy fromthe SUN. This energy is transferred to the primary consumers ( grasshoppers ) . Secondary consumers ( frogs ) feed on grasshoppers , which in turn PASS on the energy to tertiary consumers ( snakes ). The apex consumers are eagles. |
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| 3311. |
What is the flux through a cube of side 'a' if a point charge of q is at one of its corner : |
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Answer» `(2q)/(in_(0))` |
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| 3312. |
Ralml wants to build up his body very quickly without following right exercise regime and balanced diet. Instead he started eating readymade food supplements. Answer the following questions based on the situation mentioned above. (i) In your opinion did Rahul take the right step? (ii) What are the harmful effects of taking artificial health supplement without consulting a physician. (iii) What values are being ignored by Rahul? |
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Answer» Solution :(i) No, the step TAKEN by Rahul was not right. (II) It can LEAD to addiction and can AFFECT the HEALTH adversely. (iii) Concern for health, prudency. |
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| 3313. |
If you keep lee at 0^(C) C and water at 0^(@)C in either of your hands, in which hand you will feel more chillness? Why? |
| Answer» SOLUTION :The hand having ice at `0^(@)C` will feel more chillness than of `0^(@)C` water. Reason: The 0°C ice takes more heat from hand equal to ml, to CONVERT 0°C lee water, `0^(@)C` as COMPARED to `0^(@)C` water of same mass. Hence m & L are the mass and latent heat of fusion of water repectively | |
| 3314. |
Assertion : The refractive index of the medium is different for different coloured lights.Reason : The refractive index of a midium is dependent on the wavelength of the light. |
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Answer» If both assertion and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. |
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| 3315. |
Explainthe functionfo thefollowingparts of an electric motor : (i) Armatur . (ii) Brushes . (iii) Split ring . |
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Answer» Solution :Function of variousparts of an electricmotoris as GIVEN below : (i) Armatur coil CARRIES current . As a result two longarmsof armature coil experience equal FORCE in MUTUALLY oppositedirectionand undertheirinfuencethe coil beginsto rotate . (ii) Brushes drawcurrentfrom split ringsand SUPPLY it to coil. (iii) Split ringsdraw currentfrom the battery . However , split rings changetheir contacts withbrushes afterevery half rotation. As a result current supplied to thearmature coil throught brushes changes its direction afterever half rotation. |
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| 3316. |
Is water conservation necessary? Given reasons. |
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Answer» Solution :Conservation of water is necessary due to following reasons (i) Uneven DISTRIBUTION Some parts of our country have high resources of water WHEREAS other parts suffer from chronic water shortage. (ii) Wide seasonal as well as yearly FLUCTUATION in rainfalls. (III) Water in rivers and ponds is polluted by dumping of untreated sewage and industrial wastes into it. (iv) The changing life style of people, especially in urban areas, is consuming more water. |
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| 3318. |
The far point of a myopie person is 150cm in front of the eye, calculate the focal length and the power of lens to enable see distant object clearly, |
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Answer» Solution :Far POINT `(v)=150cm` USING lens FORMULA,`(1)/(F)=(1)/(v)-(1)/(mu)` `(1)/(f)=(1)/(f)-((-1)/(150))-((-1)/(oo))` `therefore" " f=-150 , "POWER" = (100)/(150)=(-2)/(3)=-0.66 D` |
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| 3319. |
Whenferrous crystalsareheated, theresiduein thetesttubeis ______ |
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Answer» redcoloured |
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| 3320. |
What is the use of SteeringWheel ? |
| Answer» SOLUTION :A smallsteeringwhell HELPS to manoeuore careasily by transferringa TORQUE to the wheels with less EFFORT. | |
| 3321. |
The values of mA and mu A are |
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Answer» `10^-6 A and 10^-9 A` RESPECTIVELY |
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| 3322. |
What is the nature of image formed on the retina of the eye? |
| Answer» SOLUTION :REAL and INVERTED IMAGE | |
| 3323. |
Name the scientist who discovered the relationship between electric current and magnetic field. |
| Answer» SOLUTION :Danish PHYSICIST, H.C. Oersted ESTABLISHED the relation between ELECTRICITY and magnetism. | |
| 3325. |
A student wants of project the image of a candle flame on the walls of the school laboratory by using a mirror. (i) Which type of mirror should he use and why? (ii) At what distance, in terms of focal lengthf of the mirror, should he place the candle flame to get the magnified image on the wall? (iii) Draw a ray diagram to show the formation of the image in this case. (iv) Canhe use this mirror to project a diminished image of the candle flame on the same wall? State how if your answer is yes why not if your answer is no. |
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Answer» Solution :(i) He should use a concave mirror as it forms REAL images. (ii) He shouldplace the candle FLAME between the focus and centre of curvature of the mirror to get the magnified image on the wall. (iii) The RAY diagram for the formation of the image ISSHOWN below.  (iv) Yes, he can get a diminished image of the candle flame when the object is locasted at bayonets. |
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| 3326. |
Assertion: A neutron impinging on U^(235) , splits it to produce Barium and Krypton. Reason:U-235 is a fissile material. |
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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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| 3327. |
What is a rainbow? |
| Answer» SOLUTION :A natural spectrum formed in the sky after rain shower due to DISPERSION of light CAUSED by suspended water DROPLETS in atmosphere. | |
| 3328. |
Tow identical solid balls, one of ivory and the other of wetr-clay are dropped from the same height on to the floor. Which one will rise to a greater height after striking the floor and why? |
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Answer» Solution :We KNOW that ivory ball is more ELASTIC than WET-clay ball. Therefore, the ivory ball will tend to regain its original shape in a very SHORT time after the collision. Due to it, there will be large energy and momentum transfrer to the ivory ball in comparison to the wet- clay ball. As a result of it , the ivory ball will raise higher after the collision. |
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| 3329. |
In question 71 above, two persons meet each other from the first point at |
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Answer» 70m |
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| 3330. |
What is the difference between the wires used in the element of an electric heater and in a fuse ? |
| Answer» Solution :The melting point of the wire used in a HEATER ELEMENT is HIGH while a FUSE wire has alow melting point. | |
| 3331. |
500 litre of water is raised from the floor of a house at height 4 m to its third floor a height 12 m.State whether the potential energy of water will decrease or increase. Find the decrease/increase in potential energy of water.Take ,g=10 Ng^(-1) ,density of water =1kg "litre"^(-1) |
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Answer» Solution :GIVEN ,MASS of WATER m=volume `xx` density =500 LITRE `xx` 1 kg `litre^(-1)` =500 kg `h_(1)=4m,h_(2)`=12m,g=10 N `kg^(-1)` Since height of water above the ground increase `(h_(2) GT h_(1))` , so the potential energy of water increases. Increases in potential energy =mg `(h_(2)-h_(1))` |
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| 3332. |
State the necessary conditions to operate an ocean thermal energy conversion plant. |
| Answer» SOLUTION :The difference in TEMPERATURE of WATER at the surface of ocean and at DEEPER levels (at depth upto 2 KM) should be `20^(@)C` or more. | |
| 3333. |
What precautions can be taken for preventing heart disease? |
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Answer» Solution :Prevention for preventing heart disease 1. Reduction in the intake of calories . Low SATURATED fat , CHOLESTEROL rich food, low carbohyddrates and common salt. 2 . Increase in the intake of fibre DIET, fruitsand vegetable , protein, minerals and vitamins. 3. Regular exerise, walking and yoga are essential for body weight mainateance. 4. Avoid alcohold consumption , Psyhchotrophic drugs and smoking . (II) Protina, shakt and Rathana are lysine rich MAIZE hybrids, which are developed in India. |
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| 3334. |
In a tungsten electric-bulb, a coil ofwire, rather than a straight wire, is used. |
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Answer» Solution :A coil of wire has MUCH greater surfacearea than a STRAIGHT wire if enclosed in the samebulb. This results in more emission of LIGHT. Hence, in a tungsten electric-bulb, a coil ofwire, RATHER than a straight wire, is USED. |
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| 3335. |
The equation of state for real gas is given by ((p + (a)/(V^(2))(V - b) = RT. The dimension of the constant a is ………………. . |
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Answer» `[ M L^(5) T^(–2)]` |
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| 3336. |
What is biomass ? Name the reaction that takes place in a biogas plant. Write the main constituents of biogas. List two reasons for considering biogas an ideal fuel for domestic use. |
| Answer» SOLUTION :Anaerobic DECOMPOSITION reaction takes place, main constituent of BIOGAS is `CH_(4)` (methane) , biogas is a clean fuel and has HIGH calorific value. | |
| 3337. |
Three resistors of values 2Omega,4Omegaand6Omega are connected in series. Find the equivalent resistance of combination. |
| Answer» Solution :`12Omega(becauseR_(1)+R_(2)+R_(3)=R_(EQ))` | |
| 3338. |
The essential difference between AC generator and a DC generator is that |
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Answer» AC generator has an ELECTROMAGNET while a DC generator has permanent magnet |
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| 3339. |
Power of a lens is numerically defined as the reciprocal of its ___________ . |
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Answer» WAVELENGTH |
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| 3340. |
Blade, Dettol, Torch, Explosives |
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Answer» SOLUTION :Explosives Blade, dettol and TORCH are necessary materials which are found in a first aid box, WHEREAS explosives are not kept in it. |
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| 3341. |
State any four objectives of disaster management. |
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Answer» SOLUTION :State any four OBJECTIVES of disaster management. (1) To save human life from disasters. To help them for moving away from the place of disasters by rapid action. (2) To supply essential commodities to the AFFECTED people. This helps to reduce the gravity of disaster. People are given grains, water and clothes and other basic necessities under this objective. (3) To bring back the conditions of affected people to normalcy. (4) To rehabilitate the affected and displaced victims. (5) To think and execute the protective measures in order to DEVELOP capability to face the disasters in future. |
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| 3342. |
What happens when food materials containing fats and oils are left for a long time ? List two observable changes and suggest three ways by which this phenomenon can be prevented. |
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Answer» Solution :* FOOD becomes rancid due to oxidation of OILS and fats. * There is a changed in smell. * There is a change in taste. * Antioxidants are ADDED to the food. * Food should be kept in air-tight containers. * Flush the bags of CHIPS with nitrogens. |
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| 3343. |
In a conductor, the charges will flow from ______________ electric potential to __________ electric potential. |
| Answer» SOLUTION :HIGHER, LOWER | |
| 3344. |
Define angle of friction and angle of repose. Show that both are numerically equal. |
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Answer» |
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| 3345. |
What are semiconductors' Explain the principle of working of solar cells made of semiconductor. Why are solar panel cells used in artificial satellites? |
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Answer» Solution :SEMICONDUCTORS are metals which allow only a partlal current to pass through them in one direction only. The conductivity of a semiconductor INCREASES when light falls on them. lts conductivity also increases if certain impurities are added. Materials like sillicon, selenium, cadmium sulphide, or copper sulphide act as semiconductors. In a solar cell, the pieces [wafers ] of semiconducting materials contalning impurities are such that a potential difference develops berween two regions of a semiconductor when light falls on it. Thus, when solar radiations fall in a solar cell, it converts solar energy into electrical energy. A lead storage battery is connected in the circuit which gets charged and can be used as and when desired. The power generated by a single solar cell is very low. A single solar cell with an area of 4 cm by 2 cm has an output voltage of about 0.4- 0.5 volts at 60 milliamperes of current. So, a large number of solar cells are MOUNTED together to generated appreciable electrical power. The solar cells are arranged in series to form solar panels. Solar panel cells are mosty used in space satellites which remain in outer space for many years. The space satelite contalns solar panels which convert SUNLIGHT into electrical energy and thus electrical ener8 is used by satellite to do various functions. |
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| 3346. |
Red panda : Rare species : : Giant Squirrel : ……. |
| Answer» SOLUTION :INDETERMINATE SPECIES | |
| 3347. |
During sunrise and sunset sky appears red while during the day it appears blue. Explain these natural phenomenon. |
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Answer» Solution :This is because of scattering of light. Light from the sun near the horizon passes through larger distance in the earth.s ATMOSPHERE before reaching our EYES. So, most of the blue light and shorter wavelengths are scattered AWAY by the particles. Therefore, the light that reaches our eyes is of longer wavelengths. This gives rise to the REDDISH appearance. But during the DAY shorter wavelengths are scattered more by molecules of air and scattered blue light enters our eyes. |
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| 3349. |
The questions given below consist of an assertion and the reason. Use the following key to choose the apAssertion: Incident light is reflected in only one direction from a smooth surface.Reason: Since the angle of incidence and the angle of reflection are same, a beam of parallel rays of light falling on a smooth surface is reflected as a beam of parallel light rays in one direction only.propriate answer. |
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Answer» (a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (ii) The fusion involving two polar nucleus and a sperm nucleus, that occurs in double fertilization in a seed plant and results in the formation of endosperm , is called the TRIPLE fusion. (iii) Importance of forests. `**` Forest are the important component of our environment and are DOMINATED by microorganisms, flowering plants, shrubs, climbers and dense trees. `**` Forest provide a vast habitat for wild animals. `**` Forests help for the economic development of our country. `**` Forest are the source for a wide range of renewabel natural resource. `**` Forest provide wood, food , fodder, fibre and medicine. `**` They act as carbon sink, regulate climatic conditions, increase rainfall and reduce global warming. `**` Forests protect wild life and also acts as catchment for water conservation. `**` They prevent natural hazards like floods and landslides. `**` They play a vital role in maintaining the ecological balance. |
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| 3350. |
Internet my friend. Get more information from the following websites. www.physics.org www .britannica.com |
| Answer» SOLUTION :[STUDENTS are expected to visit the above mentioned WEBSITES and collect more INFORMATION about the LENSES.] | |