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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.
| 4301. |
400 g of steam at temperature 100^@C condenses completely to form water at temperature 100^@ C giving off heat of 216 kcal. Find out latent heat of vaporisation of water |
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Answer» heat released (Q) =216 kcal = 216000 cla To find:LATENT heat of varporisation of water (L) Formula Q=mL Calculation: Heat given off duringHeat absorbed during condensation = vaporistation From of formula `L=Q/m = (21600)/(400)= 540` cal/g |
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| 4302. |
Colour of light which deviates maximum through prism is : |
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Answer» RED |
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| 4303. |
Distinguish between alternating current and direct currnet.Explain why alternating current is preferred over direct current for transmission over long distances. |
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Answer» SOLUTION :Alternating Current : If the current changes direction after EQUAL intervals of time, it is called alternating current. The positive and negativepolarities of AC are not fixed. DIRECT Current : Ifthe current always flows in the same direction, it is called direct current. It can be obtained from a cell or a battery. The positive and negative polarities of DC are fixed for long distance transmission. AC is preferred as it causes MINIMUM loss of energy during transmission. |
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| 4304. |
A short-sighted person has a near point of 15 cm and a far point of 40 cm. (a) Can he see clearly an object at a distance of : (i) 5 cm ? "" (ii) 25 cm ? ""(iii) 50 cm ? (b) To see clearly an object at infinity, what kind of spectacle lenses does he need ? |
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| 4305. |
What is cornea ? |
| Answer» Solution :Cornea is a THIN MEMBRANE forming the outer bulged portion of the human eye through which LIGHT ENTERS the eye. | |
| 4306. |
Suggestapproaches towards the conservation of forests. |
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Answer» Solution :The following measures are suggested for the CONSERVATION of forests , (i) Pantation of indigenous or exotic species to develop forests in all the available land., (ii)INDISCRIMINATE felling of trees for the purpose of timber mustbe reduced (III)The forest reserves must be protected from fuelstarved villagers , fodder - starved cattles and commercial exploitation. (IV)Participation of local people and villagers must be taken in conservation of forestsand they should be given proper EMPLOYMENT. |
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| 4307. |
…………..is the hardest substance and has the highest melting and boiling points. |
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Answer» IODINE |
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| 4308. |
The distance of distinct vision for normal human eye is ……….. . |
| Answer» Answer :25 cm | |
| 4309. |
To protect the hourse hold electrical appliances from overloading due to excess current. . . . . . . . . . |
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Answer» FUSE wire |
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| 4310. |
What is Impulsive force ? |
| Answer» SOLUTION :Large force ACTING for very SHORT INTERVAL of time iscalled as" Impulsiveforce " . | |
| 4311. |
Two discs of moments of inertia I_(1) and I_(2) about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed omega_(1) and omega_(2) are brought into contact face to face with their axes of rotation coincident . What is the angular speed of the two-disc system ? |
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Answer» Solution :(i) LET w be the angular speed of the two-disc system. Then by conservation of angular momentum. `(I_(1) + I_(2))omega = I_(1)omega_(1) + I_(2)omega_(2)` Or `omega =(I_(1)omega_(1) + I_(2)omega_(2))/(I_(1) + I_(2))` (II) INITIAL K.E. of the two discs. `K_(1) = 1/2 I_(1)omega_(1)^(2) + 1/2 I_(1)omega_(2)^(2)` Final K.E. of the two disc system. `K_(2) = 1/2(I_(1) + I_(2)) omega^(2)` `=1/2(I_(1) + I_(2))((I_(1)omega_(1) + I_(2)omega_(2))/(I_(1) + I_(2)))^(2)` Loss in K.E. `= K_(1)-K_(2) =1/2(I_(1)omega_(1)^(2) + I_(2)omega_(2)^(2)) -1/(2(I_(1) + I_(2)) (I_(1)omega_(1)^(2) + I_(2))(omega_(1) - omega_(2))^(2)` = a positive quantity `[therefore omega_(1) ne omega_(2)]` Hence there is a loss of rotational K.E. which appears as heat. When the two discs are brought together, work is DONE against friction between the two discs. |
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| 4312. |
Name an efficient fuel obtained from cowdung and other animal and plant wastes. Also mention its main constituent. |
| Answer» SOLUTION :BIOGAS, METHANE. | |
| 4313. |
When a 12 V battery is connected across an unknown resistor there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor. |
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Answer» SOLUTION :V=12 V I=2.5 mA = `2.5xx10^(-3)` A R = ? `R= (V)/(I) = (12)/(2.5xx10^(-3))` =` 4800 Omega` |
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| 4314. |
In the above experiment, the wire moves through the ice slab. However, the ice slab does not break. Why? |
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Answer» Solution :In the above experiment, it is observed that the wire gradually PENETRATES into the ice slab. After some time, the wire comes out of the lower surface of the ice slab. HOWEVER, the ice slab does not break. REASON : The MELTING point of ice becomes lower than `0^@C` due to pressure. This means that at `0^@C`, the ice gets converted into water. As soon as the pressure is removed, the melting point is restored to `0^@C` and water gets c·onverted into ice again. Hence, even though the thread cuts the ice surface and penetrates, immediately the ice is FORMED when the pressure is removed. Hence, the ice does not break. 
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| 4315. |
Mie scattering is responsible for the …………. Apperance of the clouds. |
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Answer» red |
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| 4316. |
Define inertia. Give its classification. |
| Answer» Solution :The inherent PROPERTY of a body to resist any CHANGE in its state of rest or the state of UNIFORM motion, unless it is influenced upon by an external unbalanced force, is known as .inertia. | |
| 4317. |
A food chain in a polluted aquatic ecosystem is given. Observe it and answer the following question. Fresh water rarr Algae rarr Fishes rarr Birds. (i) Which organis ms are disturbed more due to biomagnitication ? Why ? (ii) This ecosystem will be destroyed gra dually due to biomagnification. Why? |
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Answer» SOLUTION :Birds are disturbed more duc to biomagnification. As the birds occupy the TOP most level in the given food chain, the MAXIMUM concentration of harmful chemicals causing biomagnification get accumlated in their body. Biomagnification is the process of accumulation of nondegradable chemicals in the various trophic LEVELS of food chains. As the chemicals are non-degradable or cannot be washed. they cannot be removed from the organisms of the food chain. This leads to gradual destruction of the ECOSYSTEM. |
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| 4318. |
On a rainy day skidding takes place along a curved path. Why ? |
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| 4319. |
What amy be the relationship between lake and birds on tree ? |
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Answer» Solution :a. The lake and birds on TREE are related to aquatic ecosystem. b. Apart from the terrestrial ecosystem , birds also form a PART of aquatic ecosystm, e.g., PONDS, lakes, etc. This can be explained by the following food chain `:` PHYTOPLANKTONS `rarr `Zooplanktons `rarr `Fishes `rarr `Birds. c. Phytoplanktons growing in pond are food for zooplanktons. These zooplanktons are then eaten by fishes . Birds feed on these fishes. d. According to this food chain , birds are also a part of lake ecosystem. |
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| 4320. |
When is the magnification produced by a lens (1) positive (2) negative ? |
| Answer» SOLUTION :The magnification PRODUCED by a LENS is (i) positive when the image is virtual (as it erect) (II) negative when the image is real (as it is INVERTED). | |
| 4321. |
Do you see the advertisements about increasing awareness on avoiding the discrimination between girls and boys or sister and brother in same family on choice for fresh/left-over food, learning medium ? |
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Answer» Solution :i. Yes There are various advertisements displayed to promote gender EQUALITY. They focus not only on avoiding discrimination between boys and GIRLS in house, but also emphasize on given due RECOGNITION to girls and encourage them to excel in all the fields. ii. Such KIND of awareness has changed the earlier scenario of boys getting preference in many houses. |
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| 4322. |
List down the factors on which the lateral displacement of a light ray which emerges out from a rectangular glass slab depends. |
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Answer» Solution :(i) Thickness of the GLASS slab. (The thicker the glass slab, GREATER is the LATERAL DISPLACEMENT). (II) Angle of incidence (The greater the angle of incidence, greater is the lateral displacement). |
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| 4323. |
Name the type of current given by a cell. |
| Answer» SOLUTION :The TYPE of CURRENT given by a cell is DIRECT. | |
| 4324. |
Whathappens to themagneticfieldlines due to a current - carryingconductor when the currentis reversed ? |
| Answer» SOLUTION :The DIRECTIONOF magnetic fieldlines also GETS reversed. | |
| 4325. |
Explain how Avogadro hypothesis is used to derive the value of atomicity. |
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Answer» Solution : ( i)The Avogadro.s law STATES that "equal VOLUMES of all gases under similar conditions of temperature and pressure contain equal number of molecules". (ii) Let US consider the reaction between hydrogen and chlorine to form hydrogen chloride gas. `H_(2(g))+Cl_(2(g))+2HCI_((g))` `1 volume + 1 volume to 2 volumes` (III) "According to Avogadro.s law, I volume of any gas is occupied by number of molecules. " "n" molecules + "n" molecules`to`"2n" molecules If "n"= 1, then 1 MOLECULE + I molecule `to`2 molecules. `1//2 "molecule" +1//2 "moleculeto molecule"` (iv) I molecule of hydrogen chloride gas is made up`1//2` of molecule of hydrogen and`1//2` molecule of chlorine. (v) molecule of hydrogen contains alumn.So, 1 molecule of hydrogen contains 2 atoms. So, hydrogen atomicity is 2. Similarly chlorine atomicity is also 2. So, `H_(2)` and `Cl_(2)` are diatomic molecules. |
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| 4326. |
What measures would you take to conserve electricity in your house ? |
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Answer» SOLUTION :(a)PUT off the fans and lights when they are not required . (b)Maximum USE of solar radiation. (c ) Use of solar water HEATING system during winters. (d)Use of fluorescent TUBES or CFL. |
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| 4327. |
How can we offer first aid to victims of any disaster? |
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Answer» Solution :Other than arranging for quick medical assistance, following are the list of first aids to be provided to victims of disasters: a. Airway: If the victim has difficulty in breathing, the head should be held in a backward sloping position or the chin should be RAISED so that the respiratory passage remains open. b. BReathig: If breathing has stopped, the victim should be given artifical ventilation by mouth to mouth resuscitation. c. Circulation: If the victim is unconscious, then after givein mouth the mouth resusciatation twice, the heart should be PRESSED down hard by pressing the chest wiht both the palms and repeating the same for several times. This should be performed only by a trained person. d. Bleeding: If the victim is bleeding through the wound, then the wound should be COVERED with an antiseptic pad and pressure by thumb or palm should be applied on it. Fracture: If any bone is fractured, it is essential that the fractured part be immobilized. It can be done with the help of any available wooden rods or batons or rulers. f. Burns: If the victims has burn injuries, it is beneficial to hold the injured part under clean and cold flowing water for at LEAST 10 minutes. |
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| 4328. |
Give two examples of each (i) Natural macromolecules, (ii) Manmade macromolecules. |
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Answer» Solution :(i) NATURAL MACROMOLECULES : Polysaccharide, protein and nucleic acid. (II) MANMADE macromolecules : Elastomers, plastic, nylon. |
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| 4329. |
Define: The universal law of gravitation and derive mathematically. |
Answer» Solution :The universal law of grivatation: Everyy object in the universe attracts every other object with a force with is directly PROPORTIONAL to the product of their masses and inversely proportional to thesquare of the distance between their centres.  Let `m_(1)` and `m_(2)` be the masses of two objects, the distance between their centres be d. The gravitational attraction between the two wil be GIVEN by `F ALPHA(m_(1)m_(2))/(d^(2))` `:.F=(Gm_(1)m_(2))/(d^(2))` (G is constant) G is CALLED gravitational constantit is also known as universal constant of gravitation. |
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| 4330. |
Banks continuously spread the massage on mobile phones about not to disclose the Adhar card /PAN card/ credit card/ debit card number and other personal information if demanded by any person. Do not disclose your PIN to anyone while withdrawing cash from ATM machine or purchasing through card payment. Why such instructions are given ? |
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Answer» Solution :i. Information such as Aadhar card, PAN card, credit card, debit aced number, etc. contain details about bank accounts, transactions as well as other personal details. ii. If these details are shared with any fraudulent person, he may misuse it, leading to great loss to the owner of that information. iii. Also, if the ATM is desclosed to a third person, it can be used to withdraw mony from the bank account without the knowledge of the owner of the accout and thismaylead to FINANCIAL loss. iv. Due to the above importance of this personal information, SEVERAL people posing as bank employees try to GET access to this information. In ORDER to avoid occurrence of such frauds, banks and other financial organisations continously spread the massage to avoid sharing of Aadhar card /PAN card /credit card/ debit card number as well at ATM pin with any person. |
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| 4331. |
Two convex lenses of focal lengths 25 cm and 15 cm are placed in contact with each other. Find the focal length of combination. |
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Answer» To FIND: Focal length of COMBINATION (f) Formula: `(1)/(f)=(1)/(f_(1))+(1)/(f_(2))` Calculation: From formula, `(1)/(f)=(1)/(25)+(1)/(15)=(3)/(75)+(5)/(75)=(8)/(75)` `therefore""f=(75)/(8)=9.375 cm` |
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| 4332. |
Transfer of heat energy from low temperature to high temperature body is called __________. |
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Answer» convection |
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| 4333. |
Identify my class/phylum and give one example of it : (a) I have mammary glands and exoskeleton in the form of hair . |
| Answer» Solution :Class : MAMMALIA, EXAMPLE : CAT , DOG , MAN . | |
| 4334. |
On what factors does radius of gyration of body depend ? |
| Answer» SOLUTION :MASS DISTRIBUTION | |
| 4335. |
Choose the correct relation between u, v and r for a spherical mirror: |
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Answer» `R=(2uv)/(u+v)` |
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| 4336. |
Disinterest towards surroundings, headache, tinnitus, increase in concentretion. |
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Answer» Solution :Increase in concentration All other are ill effects of EXCESSIVE use of MODERN TECHNOLOGY, with increase in concentration is not an outcome of this behavior. RATHER, excessive use of modern technology LEADS to decrease in concentration. |
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| 4337. |
"the prejudice against the traditional use of forest areas have no basis".explain. |
| Answer» Solution :the great HIMALAYAN national park contains alpine meadows within its reserved areas.these meadows were grazed by SHEEP in summer . But after the formation of national park , this practice was stopped. Due to this , the grass first GROWS very TALL and then falls over preventing FRESH growth from below. | |
| 4338. |
The radioactive displacement law is framed by .................... |
| Answer» SOLUTION :SODDY and FAJAN | |
| 4339. |
Observe the diagram given and aswer the question asked. d. What changes in 'C' takes place while viewing object of various distances? |
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Answer» Solution :1. The capacity of human eye toview objects placed at various distances clearly is called power of accommodation. 2. The size of the lens CHANGES and the focal LENGTH of lens is changed so that the IMAGE of objects placed at various distance falls on retina. 3. While viewing objects placed close to the eye, the focal length of the lens is decreased. This is achieved by making the lens more round. Ciliary muscles aprt from holding the lens also perform this function . 4. While viewing objects placed far away form eye, the lens is flattened so that its focal length increases. Ciliary muscles take care of this function. 
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| 4340. |
Give an example for conditioned reflexes. |
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Answer» SOLUTION :(a) Playing harmonium by STRIKING a particular key, on seeing a MUSIC note is an example of conditioned reflexes which REQUIRED conscious training effort. (b) 12 pairs of cranial NERVES and 31 pairs of spinal nerves are present in man. |
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| 4341. |
Find the power of a convex lens of focal length 2 m. |
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Answer» Solution :GIVEN : Focal length (F) = 2 m To find : POWER of convex lnes (P) Formula : P = `1/f` Solution : `therefore P = 1/f = 1/2 = 0.5` `therefore P = 0.50` The power of the convex lens is 0.5 D. |
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| 4342. |
In which of the following the image of an object placed at infinity will be highly diminished and point sized ? |
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Answer» Concave mirror only |
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| 4343. |
Explain addiction seen ion children giving examples. What are its causes and effects ? |
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Answer» Solution :1. Chidren in their early age ytry up on tobacco, cigarette, gutkha, ALCOHOLIC drinks, drugs, etc. Some are indulged in theft and CYBER CRIME also. 2. Peer-group influence is stronger in case of adolescents. They always prefer the company of friends and follow their good or bad habits. 3. Children are addicated to dealdly substances due to peer-group pressure, as a symbol of high standard of living or as an imitation of elders. 4. Intoxiating durgs of plant origin and some chemicals may permanentaly damage the HUMAN nervous system, muscle system, heart etc. 5. Consumption of tobacco in any from can cause cancer of mouth and lungs. 6. Theft, crime violence, etc. make children criminals and SOCIALLY and mentally ill. |
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| 4344. |
When does an electricshort circuitoccur ? |
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Answer» Solution :An electricshort circuittakes place when the livewire and neutral wireof the electricsupply linetouch EACHOTHER directly or INDIRECTLY via a conductingwire . Thisoccurs when the PLASTIC INSULATION ofthe wiregets torn or there is afaultin the ELECTRICALAPPLIANCE . |
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| 4345. |
Draw the course of rays through a glass prism ABC. |
Answer» Solution :The COURSE of ray through a GLASS PRISM `ABC` is shown in (FIG. 2.30).  .
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| 4346. |
Which of the following is used in solar cooker to harvest the solar energy |
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Answer» SOLAR panels |
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| 4347. |
Which problem does the common man face due to incidence of cyber crime ? |
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Answer» Solution :Some of the problems faced by the common man due to the incidence of cyber crime are as follows : i. Sale of inferior quality or impaired items than those shown on online spopping websites deceive the customers. ii. Onlone bank TRANSACTIONS are done by using the PIN without the knowledge of the costomers, which results in financial loss to the customers. iii. Hacking of confidential information of government, insitutes and companies through internet, puts the data of general public at risk. iv. Fake accounts on SOCIAL media sites like Facebook leads to tesing or financial EXPLOITATION of people. v. Piracy of photos, videos, music, softwere, literature, etc. causes hug financial losses to the legal owner of these things. VI. Circulation of degrogatory massages, vulgar pictures and inflammatory statements on electronic media lead to tensions in the society. vii. Personal information and phone numbers get shared with others through social media sites like email, Facebook and WhatsApp. This may lead to incoming of unwanted meassages whihc can imparir or shutdown the MOBILES and computers. |
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| 4348. |
What is the SI unit of refractive index ? |
| Answer» SOLUTION :REFRACTIVE INDEX is a UNITLESS QUANTITIY | |
| 4349. |
A positivelycharges particle (alpha particle) projected towards west is deflected towards north by a magneticfield . The directionof magneticfield is …… |
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Answer» towards south The deflection of alphaparticleis towards north . This showsthatthe magneticforceacts on it towards the north (direction). Hence , here (a) direction of current I istowards west and (b) direction of force F istowards north .  letus nowhold the first (force) finger ,middle fingerand THUMB ofyour LEFT hand at right angles to oneanother . Adjust the left hand in sucha way that your middlefingerpoint towards the west( in the directionof the current ) andthe thumb pointstowards the north ( in the directionof the force). Inthis case , your first(force) fingerpoints UPWARDS (shown by the symbol ). Sincethe directionof the forefinger gives the direction of themagneticfield ,the magneticfield WOULD be in the upward direction .[see figure 13.23(a) or 13.23 (b)]. |
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| 4350. |
Figure shows a block and tackle system of pulleys used to lift a load. (a) How many strands of tackle are supporting the load ? (b) Draw arrows to represent tension T in each strand. (c) What is the mechanical advantage of the system? (d) When load is pulled up by a distance 1 m, how far does the effort end move ? (e) How much effort is needed to lift a load of 100 N? |
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