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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.
| 8301. |
Explain the importance of fossils. |
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Answer» Solution :(i) Parasitic adaptation of Leech: (a) BLOOD is sucked by pharynx (b) The salivary glands produce HIRUDIN which does not ALLOW the blood to coagulate. (c) Anterior and posterior ends of the body are provided with suckers by which the animal attaches itself to the body of the host. (ii) Importance of Fossils: (a) Fossils are useful in classification of plants. (b) Fossils throw light on phylogeny and EVOLUTION of plants (c) Fossil plants give a historical approach to plant kingdom (d) Fossil plants can be used in the field of descriptive and comparative anatomy |
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| 8302. |
How does the potential difference divide itself in a series combination of resistors? |
| Answer» Solution : In a series combination of resistors, the potential difference across any of the resistors is DIRECTLY PROPORTIONAL to its RESISTANCE. | |
| 8303. |
When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of a : |
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Answer» COMBINATION REACTION. |
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| 8304. |
What are the advantages and disadvantages of using a solar cooker ? Are there places where solar cookers have limited utility ? |
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Answer» Solution :Advantages of using solar cooker : 1. It does not produce any pollution. 2. Its WORKING cost is virtually zero. 3. it saves fuel. 4. Since the food is cooked at comparatively low temperature, hence nutrients of food are not destroyed during cooking. 5. More than one item can be cooked at the same time. 6.In India we have ample sun shine. Limitations : 1. Solar energy is not available in sufficient AMOUNT all the times. It cannot be used at night time and on cloudy days. 2. Direction of solar cooker has to be changed time and again. 3. it cannot be used for frying purpose. 4. It cannot COOK chapatis. Solar cookers cannot be used at PLACES where there is not sufficient amount of sun shine. It cannot be used in INNER rooms on ground floor. |
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| 8305. |
Which of the following statements is correct? |
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Answer» A PERSON with MYOPIA can see distant objects CLEARLY |
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| 8306. |
Give an example when work done by the force ofgravity acting on a body is zero even though the body gets displaced from its initial position. |
| Answer» Solution : A coolie while MOVING on a horizontal ground with a LOAD does no WORK against the force of GRAVITY. | |
| 8307. |
What is meant by electric circuit ? Why does electric current start flowing in a circuit the moment circuit is complete ? When do we say that the potential difference across a conductorin a circuit is 1 volt ? Calculate the potential difference between the two terminals of a battery if 12 joules of work is donein transferring 2 coulombs of charge. |
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Answer» Solution :`*` A CONTINUOUS conducting path CONSISTING of wire and other resistances (like electric bulb, etc.) and a switch, between the two terminals of a cell or a battery along which an electric current flows is called an electric circuit. `*` It is the potential difference between the ends of the wirewhich makes the electric CHARGES (or current) to flow in the wire. The potential difference between two points is said to be 1 volt if 1 joule of work is done in moving 1 COULOMB of electric charge from one point to another. Thus, 1 volt `=(1 "joule")/(1 "coulomb") "" or ""` 1 volt `=(1J)/(1C)` or 1 J/C `* V=?""W=12 J ""Q=2C` Now, `V=(W)/(Q)=(12J)/(2C)=6` volts |
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| 8308. |
The coolant used in fast breeder reactor is __________. |
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Answer» LOW enriched uranium |
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| 8309. |
We do not have any tradition that curses the diseases with the help of natural resources. |
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Answer» |
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| 8310. |
An object of height 4.0 cm is placed at a distance of 30 cm from the optical centre 'O' of a convexlens offocal length 20 cm. Draw a ray diagramto find theposition and size of the image formed.Mark opticalcentre 'O' and principal focus 'F' on the diagram. Also find the approximate ratio of size of the image to the sizeof the object. |
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Answer» Solution :Given : `h_(1) =+44, u = - 30 cm, f = +20 cm` When theobject is placed between F and 2F, a real, INVERTED and magnifiedimage is formed.  Using lens formula , `1/f = 1/v - 1/u rArr 1/20= 1/v - 1/(-30)` `1/v = 1/20 - 1/30 = (3-2)/(60) = 1/60` `v = +60 cm` Now, `(h_(2))/(h_(1)) = v/u = 60/(-30) = - 2 rArr (h_(2))/(h_(1))= 2/1` or `h_(2) : h_(1) = 2 : 1` `:.` Ratio of size of IMAGE to sizeof object is `2:1` |
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| 8311. |
a) Explain the formation of Na_2Oby the transfer of electrons. b) Name the constituent metals of bronze. |
Answer» Solution :a) SODIUM has one electron in the outermost shell while oxygen has six. To complete its octet. Oxygen NEEDS two more ELECTRONS. But to complete the octet, sodium loses one electron. In order to equalise the number of electrons lost and gained, two atoms of sodium combine with one atom of oxygen. The FORMATION of `Na_2O`is shown below  b) BRONZE is made up of copper and tin. |
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| 8312. |
A piece of wire resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’ then the ratio R/R' is |
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Answer» I/25 Equivalent resistance is given by `1/(R.)=5/R+5/R+5/R+5/R+5/R=25/R` `R/(R.)=25`. Therefore, the right option is d. 25. |
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| 8313. |
Which part of the human eye helps in the perception of colours? |
| Answer» Solution :The retina of the human EYE has a LARGE number of cones shaped and ROD shaped cells. The rods respond to the intensity of light and the cones to the COLOURS. These help us to PERCEIVE colours. | |
| 8314. |
A cook uses a fire tongs of length 28 cm to lift a piece of burning coal of mass 250 g. if he applies effort at a distance of 7 cm from the fulcrum, find the effort. Take g=10ms^(-2). |
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Answer» Solution :The fire tongs is a lever of class III which has fulcrum and LOAD at the ends, with effort in between. Given : Load L=250 GF=`0*25kgf=0*25xx10N=2*5N`, laod arm =28cm, effort arm=7cm By the principle of moments. load`xx`load arm=effort`xx`effort arm `therefore`effort=load`xx("load arm")/("effort arm")=2*5xx(28)/(7)=10N`. |
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| 8315. |
A force of 98 N is just required to move a mass of 45 kg on a rough horizontal surface. Find the coefficient of friction and angle of friction ? |
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Answer» Solution :F=98N, `R=45 XX 9.8 =441N` `mu^(2)=(F')/(R)=0.22` ANGLE of friction `theta=tan^(-1) mu=tan^(-1)0.22=12^(@)24'` |
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| 8316. |
Social health involves your ability to form satisfying interpersonal relationships with others. It also relates to your ability to adapt comfortably to different social situations and act apperopriately in a variety of settings. Spouses, co-workers and acquaintances can all have healthy relationships with one another. Each of these relationships should include strong communication skills, empathy for others and a sense of accountability. In contrast, traits like being withdrawn, vindictive of selfish can have a negative impact on your social health. Overall, stress can be one of the most significant threats to healthy relationship. Stress should be managed thruough proven techniques such as regular physical activity, deep breathing and positive self-talk. What are the stress management techniques? |
| Answer» Solution :REGULAR physical activity, deep BREATHING and positive SELF- talk can be the simple strees management technique. | |
| 8317. |
Social health involves your ability to form satisfying interpersonal relationships with others. It also relates to your ability to adapt comfortably to different social situations and act apperopriately in a variety of settings. Spouses, co-workers and acquaintances can all have healthy relationships with one another. Each of these relationships should include strong communication skills, empathy for others and a sense of accountability. In contrast, traits like being withdrawn, vindictive of selfish can have a negative impact on your social health. Overall, stress can be one of the most significant threats to healthy relationship. Stress should be managed thruough proven techniques such as regular physical activity, deep breathing and positive self-talk. Which traits have negative impacts on social health? |
| Answer» SOLUTION :Being withdrawn, vindictive or SELFISH and stressed out personality has negative IMPACTS on the SOCIAL health. | |
| 8318. |
Which are the types of pollution ? |
| Answer» SOLUTION :The types of pollution are AIR pollution, water pollution,SOIL or land pollution, NOISE pollution, THERMAL pollution, light pollution and radioactive pollution. | |
| 8319. |
A shining metal 'M', on burning gives a dazzling white flame and changes to a white powder 'N'. Does 'M' undergo oxidation or reduction in this reaction ? Justify. |
| Answer» Solution :M undergoes oxidation in the REACTION BECAUSES it gains OXYGEN. | |
| 8320. |
Social health involves your ability to form satisfying interpersonal relationships with others. It also relates to your ability to adapt comfortably to different social situations and act apperopriately in a variety of settings. Spouses, co-workers and acquaintances can all have healthy relationships with one another. Each of these relationships should include strong communication skills, empathy for others and a sense of accountability. In contrast, traits like being withdrawn, vindictive of selfish can have a negative impact on your social health. Overall, stress can be one of the most significant threats to healthy relationship. Stress should be managed thruough proven techniques such as regular physical activity, deep breathing and positive self-talk. Which equlities are needed for having good social contacts? |
| Answer» Solution :STRONG communication SKILLS, EMPATHY for other and SENSE of accountability are the eqaulities needed for having good social CONTACTS. | |
| 8321. |
Social health involves your ability to form satisfying interpersonal relationships with others. It also relates to your ability to adapt comfortably to different social situations and act apperopriately in a variety of settings. Spouses, co-workers and acquaintances can all have healthy relationships with one another. Each of these relationships should include strong communication skills, empathy for others and a sense of accountability. In contrast, traits like being withdrawn, vindictive of selfish can have a negative impact on your social health. Overall, stress can be one of the most significant threats to healthy relationship. Stress should be managed thruough proven techniques such as regular physical activity, deep breathing and positive self-talk. How can you be socially healthy? |
| Answer» Solution :If ONE has ability to form satisfying INTERPERSONAL relationships with others, he or she can be socially HEALTHY. In all social situations and settings there should be APPROPRIATE behaviour. | |
| 8323. |
Mention any four differences between a glass slab and a glass prism. |
Answer» SOLUTION :
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| 8324. |
What is refractive index ? |
| Answer» SOLUTION :The ratio of speed of LIGHT is vacuum to the speed of light in a medium is DEFINED as refractive INDEX `.mu.` of that medium. | |
| 8325. |
Explain the function of the following parts fo human eye and brain. (a) Caronea (b) Iris ( c) Pupil (d) Lens ( e) Reatina and optic nerves (f) Brain |
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Answer» Solution :(a) The light enters the eye through cornea. maximum refrection of light rays entering the eye takes place at the outer surface of cornea. (b)Iris controls the size of the pupil and also regualtes the amount of light entering the eye. ( C) The pupil controls the amount of light entering the eye. If the light falling on the eye is too bright, pupil contracts, while if the light is dim, it widens. (d) The crystalline lens provides fine adjustment of focal LENGTH to get real and inverted IMAGE on the retina. (e) The light. sensitive cells on the retina get activated UPON illumination and generate electric signals. These signals are passed by OPTIC nerves to the brain. (f) The brain interprets the electric signals from the retina and also processes the information in such a way theat we perceive the objects as they are. |
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| 8326. |
What is the minimum distance between an object an its real image in case of a concave mirror? |
| Answer» SOLUTION :ZERO(0) when the OBJECT is at C. | |
| 8327. |
What is meant by specific heat capacity? How will you prove experimentally that different substances have different specific heat capacities? |
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Answer» Solution :The amount of HEAT energy required to raise the temperature of a unit mass of an object by `1^@C` is called the specific heat of that object. Experiment : To study the property of specific heat capacity. Materials : A tray with thick layer of wax, solid spheres of iron, LEAD and COPPER of equal mass, burner or spirit lamp, large beaker. Procedure : (1) Three spheres of iron, copper and lead of equal mass is taken and is put in boiling water in the beaker for SOMETIMES. (2) These three spheres are then taken out of the boiling water at `100^@C` and they are immediately put on a thick slab of wax. (3) Note, the depth that each of the sphere goes into the wax. Observation : (1) It can be observed that the iron sphere goes deepest into the wax. (2) Lead sphere goes the least and copper sphere goes to intermediate depth. Conclusion : (1) The iron sphere reaches the maximum depth in wax as it gives more heat to wax and it melts more. This is because iron absorbs more heat as compared to copper and lead at `100^@C`. (2) The lead sphere reaches the minimum depth in wax as it gives less heat to wax and it melts less. This is because lead absorbs less heat as compared to iron and copper at `100^@C`. (3) The above experiment therefore proves that lead, copper and iron absorb and emitdifferent amount of heat energy. Hence, different substances have different specific heat capacities. 
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| 8328. |
Match the Column {:("(1) Least deviation","(a) Violet"),("(2) Maximum deviation","(b) Cone shaped cells"),("(3) Tyndall effect","(c) Red"),("(4) Colour blindness","(d) Colloidal solution"):} |
| Answer» SOLUTION :1. (c) 2. (a) 3. (d) 4. (B) | |
| 8329. |
In a nuclear reactor, liquid sodium metal is used as |
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Answer» FUEL |
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| 8330. |
The speed of light in water and glass is 2.2xx10^(8) m/s and 2xx10^(8) m/s respectively. What is the refractive index of : (a) water w.r.t. glass (b) glass w.r.t water. |
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Answer» Solution :Given : `v_(w)=2xx10^(8)` m/s (water) `v_(G)=2xx10^(8)` m/s (GLASS) To find : (i) `""_(g)n_(w)=?` (II) `""_(w)n_(g)` Formula : (i) `""_(g)n_(w)=v_(g)/v_(w)` (ii)`""_(w)n_(g)=v_(w)/v_(g)` Solution (i) `""_(g)N=v_(g)/v_(w)=(2xx10^(8))/(2.2xx10^(8))`=0.909 (ii) `""_(w)n_(g)=v_(w)/v_(g)=(2.2xx10^(8))/(2xx10^(8))`=1.1 (i) Refractive index of water w.r.t. glass `""_(g)n_(w)`=0.909 (ii)Refractive index of glassw.r.t. glass `""_(w)n_(g)`=1.1 |
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| 8331. |
The resistance of a resistor is reduced to half of its initial value. In doing so, if other parameters of the circuit remain unchaned, the heating effects in the resistor will become |
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Answer» two times |
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| 8332. |
Kelvin scale has zero reading at temperature.... |
| Answer» Solution :`-273^(@)C` | |
| 8333. |
Derive an expression for the time -period of the horizontal oscillation of a massless loaded spring. |
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| 8334. |
What is a homologous series ? Explain with an example.(b) Define the following terms giving one example of each.(i) Esterification (ii) Addition reaction |
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Answer» Solution :A series of compounds in which the same functional group substitutes for hydrogen in a carbon chain is called HOMOLOGOUS series. Two successive members of a homologous series differ by - `CH_2` group. For example, `CH_3OH` and `CH_3CH_2OH.` (b) (i) Esterification Conversion of a carboxylic compound to an ester by the TREATMENT with an alcohol is called esterification. For example, `underset("Ethanoic acid")(CH_3COOH) + underset("ETHANOL")(CH_3CH_2OH)overset(Acid) rarr CH_3 -overset(O)overset(||)(C)- underset("Ester")(CH_2) - CH_3 + H_2O` (ii) Addition reaction Unsaturated hydrocarbons ADD hydrogen in the presence of a catalyst such as palladium or nickel to give a saturated hydrocarbons. This reaction is called addition Example :  Similarly, halogens and hydrogen halides can also be ADDED. |
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| 8335. |
Which fuels are obtained from biomass? |
| Answer» Solution :From biomass, the biogas and biodiesel are MAINLY obtained.The biogas is obtained from dung of CATTLE. The fermentation of cattle dung gives rise to methane. From methane, METHANOL is obtained. Ethanol is obtained from molasses of sugarcane. Some crops also give ethanol. In some countries, special crops are cultivated for the biodiesel. | |
| 8336. |
Light Reflection and Refraction . An object is placed at a distance of 0.25 min front of a plane mirror. The distance between the object and image will be |
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| 8337. |
Which acts as a link between the nervous system and endocrine system? |
| Answer» Solution :Hypothalamus, acts as a link between nervous SYSTEM and endocrine system. It lies at the base of the THALAMUS. It controls involuntary functions like hunger, THIRST, sleep, sweating, sexual desire, anger, fear, water balance, blood pressure etc. It acts as a thermoregulatory (TEMPERATURE control) center of the body. It controls the SECRETION of hormones from anterior Pituitary gland. | |
| 8338. |
Show with the aid of a ray diagram, how a right angled isosceles prism can be used to invert the rays. (a) How sould the rays fall on the prism ? (b) Which phenomenon is responsible for this action of prism? (c) What is the nature of the image in relation to the object ? |
Answer» SOLUTION :The use of a right-angled isosceles PRISM to invert the rays is shown in figure.  (a) The light rays MUST FALL normally on the hypotenuse of the prism. (b) It is based on the phenomenon of total internal reflection. (c) In figure, for the inverted object PQ, the image P.Q. is UPRIGHT. |
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| 8339. |
Calculate the force acting on a body which changes the momentum of the body at the rate of 1"kg-m/s"^2. |
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| 8340. |
For what materials Ohm's law is not applicable ? |
| Answer» SOLUTION :GASEOUS CONDUCTORS and SEMICONDUCTORS. | |
| 8341. |
Givean example each gas in liquid |
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Answer» SOLUTION :(i) Carbon-di-oxide dissolved in water (Soda water) (ii) SODIUM chloride dissolved in water. (iii) COPPER dissolved in GOLD (Alloy) (iv) Mixture of Helium - Oxygen gases |
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| 8342. |
Two identical 5 kg blocks are moving with same speed of 2ms^(-1) towards each other along a frictionless horizontal surface. The two blocks collide, stick together and come to rest. Consider the two blocks as a system. Calculate work done by (i) external forces and (i) Internal forces. |
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Answer» SOLUTION :Here no external forces are acting on the system so: `vecF_("EXT")=0impliesW_("ext")=0` ACCORDING to work energy theorem: Total W.D.= Change in K.E. or `W_("ext")+W_("int")=` FINAL K.E.-Initial K.E `0+W_("int")=0-(1/2"mu"^(2)+1/2"mu"^(2))` or `W_("int")=-"mu"^(2)=-20J` |
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| 8343. |
A car weighs 1800 kg. The distance between its front and back axles is 1·8 m. Its centre of gravity is 1·05 m behind the front axle. Determine the force exerted by the level ground on each front and back wheel |
Answer» Solution : For TRANSLATION equilibrium of CAR `N_(F) + N_(B) = W = 1800 XX 9.8 = 17640 N` For rotational equilibrium of car `1.05 N_(F) = 0.75 N_(B)` `1.05 N_(F) = 0.75 (17640 - N_(F))` `1.8 N_(F) = 1320` `N_(F) = 1320//1.8 = 7350 N` `N_(B) = 17640 - 7350 = 10290` N Force on each front wheel `=(7350)/2 = 3675` N Force on each back wheel `=(10290)/2 = 5145` N |
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| 8344. |
a] Derive an expression for the equivalent resistance of three resistors RI, R2 and R3 connected in a parallel. b] Fuse of 3 A, 5 A and 10 A are available, calculate and select the fuse for operating electric iron of I kW power at 220 V line. |
Answer» Solution : It is observed that the total current I, is equal to the sum of the separate currents through each branch of the combination. `I =I_(1)+I_(2)` Let `R_(p)` be the equivalent resistance of the PARALLEL combination of RESISTORS. By APPLYING Ohm.s LAW to the parallel combination of resistors, we have `I = V//R_(p)` On applying Ohm.s law to each resistor, we have `I_(1)= V//R_(1), I_(2)= V//R_(2)` From eqns., we have `V//R_(p) = V//R_(1)+V//R_(2)` or `1//R_(p)= 1//R_(1)+1//R_(2)` Thus, we may conclude that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the RECIPROCALS of the individual resistances. |
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| 8345. |
Complete the table. |
Answer» SOLUTION : (a) 2.5 (B)0.4 (c) `3x10^(8)` m/s (d) 3/4(E)3x`10^(8) m/s (f) 0.67 |
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| 8346. |
Whatwill happenI youcutplanariaintosmallfragments ? |
| Answer» Solution :If you cut PLANARIA into small fragments, each fragment will develop into NEW INDIVIDUAL by a specialised MASS of cell. It is called REGENERATION. | |
| 8347. |
What are magnetic field lines? How is the direction of a magnetic field at a point determined? Mention two important properties of magnetic field lines. |
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Answer» Solution :The magnetic field lines of FORCE are the lines drawn in a magnetic field along which a hypothetical north magnetic pole would move if it is free to do so. The direction of a magnetic field at a point is the direction of the resultant force acting on a hypothetical north pole placed at that point. The tangent at any point on the magnetic field line GIVES the direction of magnetic field at that point. The direction of the magnetic field at a point can be FOUND by placing a small magnetic COMPASS at that point. The north end of the needle indicates the direction of the field. Two important properties of the magnetic lines of force are: (i) The magnetic lines of force start from north pole and terminate at south pole. Inside the magnet they travel from south pole to north pole. Thus, they are closed curves. (ii) They do not INTERSECT each other because at the point of intersection there will be two directions of same magnetic field which is impossible. |
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| 8348. |
The distance between the lens and focus is called ____________. |
| Answer» Answer :D | |
| 8349. |
A coin is dropped in a lift . It takes time t_(1) second to reach the floor when lift is stationary . It takes t_(2)second when the lift is moving up with constant acceleration . Then , |
| Answer» Solution :`t_(1) gt t_(2)` | |
| 8350. |
Whenis the force experienced by a current - carryingconductorplaced in a magnetic field largest? |
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Answer» Solution :The force experinced by a CURRENT- carryingconductor placed in a magnetic field is thelargest , when the currentin the CONDUCTORIS perpendicular to the magneticfield . For REFERENCE see the following FIGURE : 
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