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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.
| 9201. |
According to Boyles's law , the shape of the graph between pressure and reciprocal of volume is ____________. |
| Answer» SOLUTION :STRAIGHT LINE | |
| 9202. |
A student arranged an electric circuit as shown alongside : He would observe : |
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Answer» no READING in EITHER the AMMETER or the VOLTMETER |
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| 9203. |
What are the physical effects of various addictions on human ? |
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Answer» Solution :i. A person may get addicted to various harmful substances like alcohol, TOBACCO, cigaratte, gutkha, drugs, etc. II. Excessive consumption of liquor leads to decrease in efficiency of nervous system (especially brain) and liver a ND reduces the lifespan of the person. In adolescents, it affects brain development and reduces ability of memorization and learning. iii. TEMPORARILY intoxicating drugs of plant orgin as well as some chemicals can permanently damage the human nervous system, muscle system, HEART, etc. iv. The use of tobacco and lead to cancer of mouth and lungs. |
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| 9204. |
(a) Write Einstein's mass-energy equation. Give the meaning of each symbol which occurs in it.(b) If 25 atomic mass units (u) of a radioactive material are destroyed in a nuclear reaction, how much energy is released in MeV ? |
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| 9205. |
How does a solenoidbehave likea magnet ? Can you determinethe north and south poles of a current - carrying solenoidwith the help of abar magneti ? Explain. |
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Answer» Solution :(1) A current- carryingsolenoid behaves like a barmagnet and the polaritiesof itsends dependupon the directionof the currentthrough it . (2) Yes,we can usea bar magnet to determine the north and south polesof a current- carryingsolenoid . (3) In orderto determine the magnetic POLES of a current - carryingsolenoidplace it in a brass HOOK and suspend it with a long thread so that it can moves freely ina horizontal plane. Bringthe north pole of a bar magnet NEAR one of its ends . If that ENDOF the solenoidmoves towards the bar magnet , thenitmust be its south poleandthe other END itsnorth pole . Onthe contrary,if that end of thesolenoidmoves away from the magnet ,then itmust beits north poleand the otherend its south pole . |
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| 9206. |
Saving energy is the need of the hour. Do you agree? If yes, why? If not, why? |
| Answer» Solution :(1) In modern civilization, continuous energy supply in neededfor thetechnology and development. (2) The energy has become a basic need for man. Energy generation, NEEDS various fuels. The coal and fossil fuels are limited. (3) Due to over-exploitation, thesereserves are GETTING fast depleted. (4) Use of fossil fuels is also resulting in POLLUTION and climate change. (5) Nuclear energy can be very hazardous. (6) Lot of research is being done in thefield of green energy, but the tremendous human population always is in need of moreenergy. Therefore, each and every person should save the energy, as SAVING energy is the need of the hour. | |
| 9207. |
Name some devices in whichelectricmotors are used . |
| Answer» SOLUTION :Electricmotors are usedin electricfans refrigerators , mixersandgrinders, washingmachines , WATER -pumps , COOLERS ,etc. | |
| 9208. |
In July 1969, ... .... ...... became the first human to step on the moon. |
| Answer» SOLUTION :NEIL ARMSTRONG | |
| 9209. |
What is the function of irlis and the muscles connectedto the human eye? |
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Answer» Solution :1. If the light falling on the eye is too bright, the muscles of iris contracts and therefore, the pupil contracts. 2. If the light falling on the eye is dim, the muscles of iris releases and therefore, the pupile widens. 3.Thus, iris controls the size of the pupil and thereby regulates the amount of light ENTERING the eye. 4.Ciliary muscles surround the lens. These muscles hold the lens in place and they also PLAY an important ROLE in vision. |
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| 9210. |
Listdifference betweenatomandmolecules . |
Answer» SOLUTION :
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| 9211. |
Who was the first person to travel into the space? |
Answer» Solution :The FIRST person to GO into the space in a spacecraft was YURI Gagarin of the then USSR. 
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| 9212. |
State the relationship between 1 volt and 1 joule. |
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Answer» SOLUTION :I volt can be defined as 1 JOULE PER Coulomb i.e. `V=W/Q` Electric Potential of a charge is the amount of work involved to move a unit of positive electric charge from an infinite position to a position against the intensity of the electric field of charge. Electric Potential is calculated in Volts, Charge in Coulomb and work in Joule. |
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| 9214. |
Match the following : {:("(1) Conidia ","(i) Yeast"),("(2) Budding ","(ii) Bacteria "),("(3) Gamma cups","(iii) Aspergillus"),("(4) Binary fission","(iv) Marchantia"):} |
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| 9215. |
a) Oil and fat containing food items are flushed with nitrogen. Why? b) Write the balanced chemcial equations for the following reactions. i) Calcium hydroxide + Carbondioxide to Calcium carbonate + water ii) zinc + Silver nitrate to Zic nitrate + silver iii) Aluminium + copper chloride to Aluminium chloride + Copper |
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Answer» Solution :To prevent the oxidation of oil and fat present in food ITEMS. nitrogen gas is flushed in food packets products formed due to oxidation of oil and fat have unpleasant SMELL and taste due to rancidity. Flushing food items containing .fat and oil with nitrogen prevents rancidity. B) i) `Ca(OH)_(2(aq))+ CO_(2(g)) to CaCO_(3(s)) + H_2 O_((L))` ii) `Zn_((s)) - 2AgNO_3 to Zn(NO_3)_(2(aq)) + 2Ag_((s))` iii) `2Al_((s)) + 2CuCl_(2(aq)) to 2AlCl_(3(aq)) + 3Cu` |
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| 9216. |
A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Object may be placed at a distance of |
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Answer» 10 cm from the mirror |
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| 9217. |
How does a metal react with a nonmetal ? |
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Answer» Solution :By oxidation of a metal, cations are formed, on the other handby REDUCTION of a nonmetal, anions are formed. The ionic compound is formed due to the metal losing electronswhile the nonmetal acceptsthe electrons . The ionic compound of SODIUM chloride is formed as sodium loses one electron while chlorine ACCEPTS one electron . `Na to Na^(+) + e^(-)` ` CI+ e^(-) to CI^(-)` `overline (Na+Ci to NACI)` Sodium chloride Similarly Mg and K form ioniccompounds `MgCI_(2) adn KCI` |
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| 9219. |
In a human eye, name the following parts. (i) A thin membrane which allows light to enter into the eyes. (ii) The muscles which help in changing the focal length of the eye lens. |
| Answer» SOLUTION :(i) Cornes (II) CILIARY MUSCLES. | |
| 9221. |
It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm. (i) What should be the range of the distance of an object palced in front of the mirror? (ii) will the image be smaller or larger than the object. Draw ray diagram to show the formation of image in this case. (iii) Where will the image of this object be , if it is placed 24 cm in front of the mirror? Draw ray diagram for this situation also to justify your answer. Show the position of pole, principle focus and the centre of curvature in the above ray diagrams. |
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Answer» Solution :(i) RANGE of distance -between 0 CM -< 12 cm M (ii) LARGER than the OBJECT 
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| 9222. |
a) Why are we not able to see the things clearly when we come out of a dark room? b) Why does the sun appear reddish early in the morning. |
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Answer» Solution :a) When we are in dark, pupil size is bigger, as we come out of dark room, its size needs to become smaller. For that time INTERVAL person is unable to see. B) During sunrise, the light rays COMING from the sun have to travel a greater distance in the earth.s atmosphere before reaching our eyes. In this JOURNEY, the shorter wave length of lights are scattered out and only longer wavelength are able to reach our eyes. Since BLUE colour had a shorter wavelength and red colour has longer wave length, the red colour is able to reach our eyes after the atmospheric scattering of light. Therefore the sun appear reddish early in the morning. |
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| 9223. |
Changes in genes of the cells are brought about in non-genetic technique. |
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| 9224. |
Using a ray diagram, explain the position, relative size and nature of image of an object placed between the F_(1)and2F_(1) of a convex lens. |
Answer» SOLUTION :
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| 9225. |
List two main causes of a person developing near-sightedness. Show with the help of a ray diagram how this defect can be corrected. |
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Answer» Solution :Student is having myopia which is CAUSED by (i) excessive curvature of the eye lens or (i) elongation of EYEBALL resulting in focusing of image in front of retina. Thus, the distant IMAGES are blurry but the nearby images are CLEAR. myopia can be corrected by using a CONCAVE lens of suitable power which diverges the light rays and makes the image formed on the retina as shown. 
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| 9226. |
(a) State Joule's law of heating. (b) an alloy of nickel and chromium is used as the heating element. Why ? (c ) How does a fuse wire protect electrical appliances ? |
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Answer» Solution :(a)The heat produced in the resistor is `H=W=VQ` We know that the relation between the charge and CURRENT is `Q=I` t. Using this, we get `H="V I t` From Ohm.s Law, `"V = I R"`. Hence, we have `H=I^(2)"R t"` This is known as Joule.s law of heating. Joule.s law of heating states that heat produced in any resistor is : `*` Directly proportionam to the square of the current passing through the resistor `H=VIt` `*` Directly proportional to the resistance of the resistor. `V=IR` `*` Directly proportional to time for which the current is passing thriugh the resistor. `H=I^(2)Rt` (b) An alloy of nickel and chromium is used as the heating element. Because: (i) It has high RESISTIVITY (ii)It has a high melting point (iii) it is not easily oxidized. (c ) (i) The fuse WIRE is connected in series, in an electric circuit. (ii) When a large current passes through the circuit, the fuse wire melts due to Joule.s heating effect and hence the circuit gets disconnected. Therefore, the circuit and the electric appliances are saved from any damage. (iv) The fuse wire is made up of a material whose melting point is relatively LOW. |
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| 9227. |
(i) Define focal length of a spherical lens. (ii) A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical centre of the lens be placed so that its image is formed 15 cm away from the lens? Find the size of the image also. (iii) Draw a ray diagram to show the formation of image in the above situation. |
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Answer» Solution :(i) Focal length of a spherical lens: DISTANCE between optical CENTRE of focus of the lens. (ii) f=-30 , u= ? ,`h_(1)=5cm, h_(2)=?,v=-15cm` `1/f=1/v-1/u` `implies1/u=1/v-1/f` `impliesu=(VF)/(f-v)=((-15cm)xx(-30cm))/(-30cm-(-15cm))` `=-30cm` `m=v/u=(h_(2))/(h_(1))` `impliesh_(2)=v/uxxh_(1)` `=(-15cm)/(-30cm)xx5cm=2.5cm` 
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| 9228. |
It is possible to produce energy from mW to MW using solar photovoltaic cells. |
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Answer» Solution :i. Solar photovoltaic cells which have energy producing capacity of mW , are connected in required series andparallel combinations to form a solar panel. II. Many soar panel are connected in series to forma solar string and many solar string are connected in parall to form a solar array which has energy producing capacity of MW. iii. Thus with the required series and parallel combination of solar photovoltaic cells to form solar panel solar STRINGS and solar arrays it is possible to PRODUCE energy from mW to MW capacity. |
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| 9229. |
In domestic electric circuit, with which wire do we connect a fuse ? |
| Answer» SOLUTION :LIVE WIRE. | |
| 9230. |
Define wave velocity. |
| Answer» Solution :The velocity with which the WAVE TRAVELS through the MEDIUM is CALLED wave velocity. | |
| 9231. |
What are ores? |
| Answer» SOLUTION :The mineral FORM which a metal can be readily and ECONOMICALLY extracted on a LARGE scale is said to be an ore. (eg.) BAUXITE `Al_(2)O_(3)2H_(2)O` is the ore of Aluminium. | |
| 9232. |
The total number of atoms per mole of the substance is __________. |
| Answer» SOLUTION :Avogardo's NUMBER' | |
| 9233. |
Forces with resultant force ______ are calledunbalanced forces . |
| Answer» SOLUTION :not EQUAL to ZERO | |
| 9234. |
Assertion : Resultant force is equal to the vector sum of all the forces. Reason : A system cannot be brought to equilibrium by applying another force. |
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| 9235. |
You would have seen at the roofs of the minister's house, hospital, hotels etc., solar panel for electricity and solar heater for hot water are placed. Now a days most of the people are preferring these methods. (i) What kind of source of energy is used here ? (ii) How it will affect our environment |
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Answer» Solution :(i) Renewable SOURCE of energy. (ii) Saving of ELECTRICAL energy, money. Non-polluting. |
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| 9236. |
State the SI unit of electric current and define it. |
| Answer» Solution :An ampere (A) which is DEFINED as the rate of flow of 1 COULOMB of CHARGE per second. | |
| 9237. |
The refractive index of a medium is dependent on the __________ . |
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Answer» WAVELENGTH |
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| 9238. |
Say True or False. The force towards the centre of the circular orbit is called centripetal force. |
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| 9239. |
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes.Compare: (i)the work done by them.and (ii)the power developed by them . |
| Answer» SOLUTION :(i) 4:3 ,(II)1:1 | |
| 9240. |
Find the focal length of a convex mirror of radius of curvature 1 m. |
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Answer» 1.5m |
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| 9241. |
Golgi complex plays a major role in |
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Answer» Fossilization |
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| 9242. |
whatiselectromagneticinduction? |
| Answer» Solution :Electromagentic inductions is the phenomenom DUE to whichan EMF is INDUCED between theends of a COIL whenevermagnetic fieldin and aroundit is CHANGED . | |
| 9243. |
Namethe partof the humanfemalereproductivesystemwherethe followingoccurs . Fertilization |
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Answer» Solution :(a) Fertilization - AMPULLA of the fallopian tube. (B) IMPLANTATION - takes place in the uterus. |
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| 9244. |
Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope. (a) Which adjustment screw (coarse/fine) were you asked to move to focus the slides? (b) Draw three diagrams in correct sequence showing budding in yeast. |
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Answer» SOLUTION : (a) The fine adjustment screw. (b) Yeast is a unicellular organism. Budding USUALLY occurs when food is available in plenty. In budding, once or more outgrowths APPEAR on one side, which enlarges in size. The nucleus divides mitotically, one daughter nucleus passes into the BUD and the other remains in the parent cell. The bud either separates off from the parent cell or new bud appears before its separation from the parent cell resulting in the formation of branched or unbranched chain of buds. 
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| 9245. |
The average energy released in each fusion reaction is about _______________J. |
| Answer» SOLUTION :`3.84 XX 10^(-12)` | |
| 9246. |
Mention any one reason due to which most of the thermal power plants are set up near coal or oil fields. |
| Answer» Solution :Because fuel is USED to produced HEAT ENERGY by BURNING. | |
| 9247. |
In an electric circuit state the relationship between the direction of conventional current in the direction of flow of electrons. |
| Answer» Solution :The DIRECTION of conventional current is OPPOSITE to the direction of FLOW of electrons | |
| 9248. |
A copper sphere of 200 g mass is heated to raise its temperature to 160^(@)C and is released in water of mass I 00 g and temperature 10^(@)C in a copper calorimeter. If the mass of calorimeter is 50 g, what will be the maximum temperature of water? (Given: specific heat of copper = 0.1 " cal/g """^(@)C) |
| Answer» SOLUTION :` 34^(@)C` | |
| 9249. |
""_88Ra^(226) experiences three alpha-decay . Find the number of neutrons in the daughter element. |
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Answer» Solution :`""_(88)Ra^(226)` consider as a parent element that is `""_(88)X^(226)` and their daughter clement is `""_(Z)Y^(A)` ACCORDING to a decay process, `""_(88)X^(226) overset(3 ALPHA "decay") ""_(82)Y^(214)+ 3alpha "decay"` During the 3a decay, the atomic NUMBER decreases by 6 and mass number decreases by 12. So the number of neutrons in the daughter element N=A-Z N = 214 -88 = 126 Number of neutrons in the daughter element N = 126 |
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| 9250. |
When do you say that two or more resistors are connected in parallel? |
| Answer» SOLUTION :Two ormore resistors are SAID to be connected in parallel, if the same potential difference EXIST ACROSS them. | |