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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.
| 7001. |
Name any two materials that are used making solar cells. |
| Answer» SOLUTION :(i) SILICON , and (II) GALLIUM or SELENIUM. | |
| 7002. |
"During the course of evolution organs or features may be adapted for new functions". Explain this fact by choosing an appropriate example. |
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Answer» Solution :The branch of biology DEALING with house such a wide variety of organisms COME to exit is turmed evolution where various evidences which support evolution are : (i) homologous organs (ii) Fossils (iii)Comparative embryology. The GIVEN statement and can be explain by studying homologous organs. (i) Homologous structures in vertebrates are wings in birds and forelimbs of lizard. (ii) They are also named as they have same structural design but different functions. (iii) Such structures give us idea about common ancestry. Ours TEETH an elephant.s tusks are homologous organs as both have same basic structure but different functions we use ask for chewing while elephant.s USERS to hold things. |
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| 7003. |
A bulb is marked 60 W and 120 V. What do the values indicate ? |
| Answer» Solution :A bulb is marked 60 W and 120V. This means that if this bulb is CONNECTED to120V source, It will ABLE to convert 60J of electrical ENERGY into heat or LIGHT in one second. | |
| 7004. |
Is it necessary that a mass should be present at the centre of mass of any system ? |
| Answer» SOLUTION : No. It is not NECESSARY to PRESENT somemass at centre of MASS of the system. Ex: At the centre of ring (or) bangle, thereis no mass present at centre of mass. | |
| 7005. |
Two bulbs have ratings 100 W, 220 V and 60 W, 220 V. Which one has the greater resistance ? |
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Answer» Solution :Resistance of FIRST BULB `R_(1)=(V^(2))/(P)=(22cancel(theta)xx22cancel(theta))/(cancel(100))=484Omega.` Resistance of second bulb `R_(2)=(V^(2))/(P)=(220xx22cancel(theta))/(6cancel(theta))=(4840)/(6)=806.6Omega.` `THEREFORE` The bulb rated 60 W,220V has the greater resistance. |
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| 7006. |
Give any two uses of radio isotopes in the field of agriculture ? |
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Answer» Solution :(i) The radio isotope of phosphorous (P-32) helps to increase the productivity of crops. (ii) The radiations from the radio ISOTOPES can be used to kill the INSECTS and PARASITES and prevent the wastage of agricultural PRODUCTS. |
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| 7007. |
State at least three points of differencebetween the followingterms/ quantities : Electric motor and Electric genertor . |
Answer» SOLUTION :
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| 7008. |
A student wants to project the image of a candle flame on the walls of school laboratory by using a lens: (i) Which type of lens should he use and why? (ii) At what distance in terms of focal length F of the lens should he place the candle flame so as to get (i) a magnified, and (ii) a diminished image respectively on the wall? (iii) Draw ray diagram to show the formation of the image in each case. |
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Answer» Solution :(i) He should use a convex lens as it forms REAL image. (ii) He should place the candle flame between F and 2F (the focus and centre of curvature of the lens) to GET the magnified image on the wall while the diminished image is obtained when the object is LOCATED at a distance greater than 2F. (iii) The RAY diagram for the formation of the magnified image is shown below: 
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| 7009. |
Differentiate the eye defects: Myopia and Hypermetropia. |
Answer» SOLUTION :
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| 7010. |
Name two electrical appliances of dally use in which electric motor is used. Name and state the principle on which an electric motor works. |
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Answer» Solution : Electrical APPLIANCE - fan, washing machine, mixer. Fleming.s Left Hand Rule - lt STATES that "STRETCH the forefinger, the central finger and the thumb of your left hand mutually perpendicular to each other. If the forefinger shows the DIRECTION of the magnetic field and the central finger that of the current then the thumb will point towards the direction of MOTION of the conductor. |
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| 7011. |
The near point of a person has shifted from 25 cm to 75 cm. Name the optical defect his eye is suffering from. Draw the course of rays for the normal eye and defective eye. |
| Answer» SOLUTION :When the near POINT SHIFTS AWAY from the eye, the person is suffering from HYPERMETROPIA or long-sightedness. | |
| 7012. |
A species can be possibly wiped out if there is a decrease in the diversity within the species that reproduce secually. |
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| 7013. |
Keeping the resistance constant, the potential difference applied across the ends of a component is halved. How does the current change? |
| Answer» SOLUTION :The CURRENT BECOMES HALF the INITIAL current. | |
| 7014. |
What is meant by power of a lens? What does its sign (+ve or -ve) indicate? State its S.I. unit. How is this unit related to focal lengths of a lens? |
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Answer» SOLUTION :(i) ABILITY of lens to converge or diverge the light RAYS. (ii) +ve sign `to` converging lens/convex lens -ve sign `to` diverging lens/ concave lens. (III) S.I. unit - dioptre 1 dioptre = 1/focal length (m) |
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| 7015. |
If a person has five resistors each of value (1)/(5) Omega, then the maximum resistence he can obtain by connecting them is |
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Answer» `1 OMEGA` |
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| 7016. |
Draw magnetic fieldlines arounda bar magnet . |
Answer» SOLUTION :
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| 7017. |
Give scientific reasons: a. Simle microscope is used for watch repairs. |
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Answer» Solution :1.Simple microscope is a single biconvex lens. 2. When the object is placed within its FOCAL length, it forms, virtual and enlarged image in front of the lens. 3. A simple microscope can magnify the object about 20 times. Therefore, the WATCHMAKER can WORK on the MINUTE PARTS of the watch easily. |
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| 7018. |
Magnification power of microscope has _______ to ________ times more magnification power than simple microscope. |
| Answer» SOLUTION :FOCAL LENGTH | |
| 7019. |
An eletricoven of 2kW power rating is operatedin a domesticelectriccircuit (220 V) thathas a currentratingof 5A. Whatresultdo you expect ? Explain. |
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Answer» Solution :Thecurrentdraw by this electricoven. `I = (P)/(V)` ` = (2000W)/(220V)` Sincethe current rating of thecircuitis 5A, thefuse usedin this circuit is onlyof 5A capacity . Hence ,when the ovenis switch ON,the fusewire (rated 5A) will getheatedtoo much, meltand break the circuit . THISWILL savethe electricoven from gettingdamged . [ Iffuseof CURRRENT ratingmore than 9.09 Ais used in the circuit or if no fusehas beenput in the circuit , there may BEA FIRE ]. |
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| 7020. |
In a single movable pulley, if the effort moves by a distance x upwards, by what height is the load raised ? |
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| 7021. |
According to Joule.s law, heat energy produced in a resistor is directly proportional to the square of ………………. . |
| Answer» SOLUTION :the ELECTRIC CURRENT FLOWING through the RESISTOR | |
| 7022. |
Collect more information about the work of voluntary and international environment organizations. |
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Answer» Solution :Voluntary Organization-Bombay Natural HISTORY Society ( BNHS),Mumbai has been promoting the cause of conservation of nature from PAST 133 years. International Environment Organization -Internation UNION for Conservation of Nature ( IUCN) , Gland VD, Switzerland,is working in the field of nature conservation and sustainable use of natural resources. |
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| 7023. |
The completeeventsof cardiaccycle lastfor0.8sec .What isthe timingfor eachevent ? |
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Answer» SOLUTION :The events during a SINGLE cardiac CYCLE INVOLVES (a) Atrial Systole - Contraction of auricles- (0.1 sec) (b) Ventricular Systole - Contraction of ventricles - (0.3 sec) (c) Ventricular diastole - RELAXATION of Ventricles - (0.4 sec) |
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| 7024. |
Most insensitive part of the eye is called : |
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Answer» BLIND spot |
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| 7025. |
According to lens formual we have (1)/(v) + (1)/(u) = (1)/(f), where u = distance of the object from the lens, v = distance of the image from the lens and f = focal length of given lens. |
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| 7027. |
When a moist slice of bread was kept in a cold and dark place for a couple of days, some organisms grew on it to form a fluffy cottony mass which later turned black. On seeing through a magnifying glass some thread like projections and thin filaments having bulb like structures at the tip were observed. (a) Write the common name of the organism observed. name the mode of reproduction that made the organism grow and spreads over the bread. (b) Draw the diagram of the organism observed and label its parts. (c) Name and write anout the structure ofthe cells that arte responsible for its reproduction. |
| Answer» Solution :(a) BREAD mould `to ` spore FORMATION, (C) 'Spores' | |
| 7028. |
With a neat labelled diagram, explain the terms total internal reflection and critical angle. |
Answer» Solution :Passage of light from water ( DENSER medium ) to air ( rarer medium ) .  The ray of light incident at the BOUNDARY separating the two media bends away from the normal on refraction. Here, the angle of refraction `r, ` is greater than the angle of incidence i. Now `._(a)n_(w ) = ( sin i)/(sin r )LT 1 `. Here,` ._(a)n_(w )` is the refractive INDEX of air with respectto water. As `._(a) n_(w)` is constant, r increases as i increases. For `r= 90^(@)`, the ray travels along the boundary. If i is increased further, as r cannot be greater than `90^(@)`, light does not enter air. There is no refraction of light and all the light enters water on reflection. This is called total internal reflection. For `r = 90^(@) , ._(a) n_(w) = ( sin i )?( sin 90^(@))= sin i `. This angle i is called the critical angle. |
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| 7029. |
a] What is the function of fuse in an electric circuit? b] What would be the rating of the fuse for an electric kettle which is operated at 220V and consumes 500W power? c] How is the SI unit of electric energy related to its commerical unit? |
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Answer» Solution :a] The function of fuse in an electric circuit The fuse in a circuit prevents over heating of the WIRES and appliances DUE to excess transfer of electric current and melts when more current passes through it. It is connected in series in domestic circuits. b] Given, Power: 500 watt Voltage = 220 Volts `I=P/V=500/220=2.27A` Rating of fuse wire will be 2.5 or 3A c] Commercial UNIT of Energy: The SI unit joule is too small to express very large quantities of energy. Hence we use a bigger unit called KILOWATT hour [kWh] to express energy. I kWh is the amount of energy consumed by an electrical gadget in ONE hour at the rate of 1000 J/s or IkW. |
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| 7030. |
Explain in detail on happenings about blue whale game. |
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Answer» Solution :Online Blue Whale or Blue Whale Challenge is an internet game which originated in Russia.This is very DANGEROUS game. It reportedly consists of fa series of tasks assigned to players by administratros over 50-days period In these 'tasks' there are challenges like watching horror movie alone inflict wounds on the body leaving the house and going anywhere,etc .After performing 50 tasks like these,the final challenges requires the player to ommit SUICIDE .many adolescents have LOST their lives due to Blue Whale game in India too, five children have commited suicide due to Blue Whale challenge This game was invested in 2013 by philipp Budeikin a 21-year-old former psyhology student.He is now arrested in 2016 and is in Russian prison.This game is banned in India The children who spent solitary life the children whose parents are not around and those who are in deep srees usually fall into the traps like Blue Whale Game One must always remember,If you are in strees talk to your elders,parents or teachers. The problems can be solved by logical and rational thinking.Our life is precious,it should not be wasted |
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| 7031. |
What is hypermetropia or far-sightedness ? Name the type of lens used to correct it. |
| Answer» Solution :Hypermetropia or far-sightedness is a DEFECT of the eye in which nearby OBJECTS appear BLURRY but distant objects are clear. It can be corrected using a CONVEX lens of suitable FOCAL length. | |
| 7032. |
List 'the factors on which the magnetic field produced by a current carrying straight conductor depends. State the rule which gives the direction of its magnetic field. Draw the pattern of magnetic field lines due to a straight current carrying field lines due to a stright current carrying conductor. |
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Answer» Solution :FACTORS on which the m.agnetic FIELD produced by a current canying CONDUCTOR depends are : (i) current passing through the conductor. (ii) distance of the magnetic compass from the conductor. Right Hand THUMB Rule gives the direction of magnetic field. 
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| 7033. |
Name three animals, which can hear ultrasonic vibrations. |
| Answer» Solution :Mosquitos, BATS and DOGS are the THREE ANIMALS that can HEAR ultrasonic vibrations. | |
| 7034. |
list any one point of difference between A.C. and D.C. |
| Answer» SOLUTION :DIRECT current always flows in one direction and ALTERNATING current REVERSES its direction periodically. | |
| 7035. |
____ are thelargestof theleuocytes . |
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Answer» Monocytes |
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| 7036. |
What are disadvantages of fossil fuels ? |
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Answer» Solution :THOUGH fossil fuel is very largely being used as a source of energy, there are number of DISADVANTAGE of USING them. 1. There are only limited reserves of fossls fuel. These fuels were formed over millions of year. If we continue to use them at PRESENT rate, we should soon run out of energy. 2. Fossil fuel is non-renewable source of energy. 3. Fossil fuels CAUSE air pollution. 4. Oxides of carbon, nitrogen and sulphur released on burning of fossil fuel are acidic oxides. These lead to acid rain affecting our water and soil resources. 5. Carbon dioxide produced by burning of fossil fuel causes greenhouse effect. |
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| 7037. |
Explain details on happenings about blue whale game. |
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Answer» Solution :a. The online blue whale game is a suicide game which PROGRESSIVELY engages a peron in various challenges finally leading to death. b. The game includes a series of 50 challenges with the last one prompting the person to END his/her life. Ity also prevents players to withdraw from the game by finding the behavioural weal points of the player. c. Children have become addicted to internet and social media and thus have become disconnected from parents, relatives and FRIENDS. This leads them to develop interest in the virtual world and fall PREY to such fatal GAMES. |
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| 7038. |
Why are the Arabari forests of Bengal known to be a good example of conserved forest? |
| Answer» Solution :The Arabari forest of Bengal were badly degraded. Then in 1972, the west Bengal Forest Department planned to revive the degraded forest by involving the local people. The villagers of the surrounding area were involved in the protection of 1272 HECTARES of this forest. With the active participation of local people LIVING around the forest, the degraded sal forest of Arabari became THICK and green within ten years. In return, the villagers were given EMPLOYMENT in both silviculture and HARVESTING operations of the forest and allowed to collect firewood and fodder from the forest area on a nominal payment. Thus, the Arabari forest provides a good example of conserved forest. | |
| 7039. |
Hydrogen has been used as a rocket fuel. Would you consider it a cleaner fuel than CNG? Why or why not? |
| Answer» SOLUTION :Hydrogen gas is CLEANER than CNG. CNG contains hydrocarbons. So, it has CARBON contents. Carbon is a form of pollutant present in CNG. On the other hand, hydrogen is WASTE free. The burning of hydrogen does not produce any waste. Hence, hydrogen Is cleaner than CNG. | |
| 7040. |
The radius of curvature of a sperical mirror is 20 cm. What is its focal length ? |
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Answer» Solution :Given that radius of curvature of the mirror R = 20 cm `therefore` Focal length `F = (R)/(2) = ("20 cm")/(2) = 10` cm |
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| 7041. |
Rohit wants to have an erect image of an object, using a converging mirro of focal length 40 cm. (i) Specify the range of distance where the object canbe placed in front of mirror. Give reason for your answer. (ii) Will the imagebe bigger or smaller than the object? (iii) Draw a ray diagram to show the image formation in this case. |
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Answer» Solution :(i) Object should be PLACED at <40 cm (less than 40 cm) in FRONT of the mirror, i.e. between FOCUS and pole, as concave mirror forms a virtual, erect and magnified image when object is placed between focus and pole. (II) Image will be bigger than the object. 
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| 7042. |
Use the data in table 12.2 to answer the following a] Which among iron and mercury is better conductor? b] Which material is the best conductor? |
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Answer» Solution :a] IRON is better conductor than mercury because the resistivity of iron is LESS than the resistivity of mercury. b] Silver having least resistivity is the BEST conductor. |
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| 7043. |
The force of attraction between molecules of water is called…………………. |
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Answer» cohesion |
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| 7044. |
The height of the real image in a convex lens is taken to be positive. |
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Answer» Solution :False. The height of REAL image in a CONVEX lens is TAKEN to be NEGATIVE. |
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| 7045. |
Voltmeter, Ammeter, Galvanometer, Thermometer |
| Answer» Solution :THERMOMETER. It is used to measure temperature, whereas others are all used to measure electrical PARAMETERS LIKE CURRENT, POTENTIAL and resistance | |
| 7046. |
What is a source of energy ? What are the two main categories of the sources of energy ? |
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Answer» Solution :A GOOD source of energy is one : (i) which would give a LARGE AMOUNT of energy per unit mass (or per unit volume) (ii) Which is cheap and easily available (iii) which is easy to store and transport (iv) Which is safe to HANDLE and use, and (v) which does not cause environmental pollution. |
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| 7047. |
The eye defect 'presbyopia ' can be corrected by |
| Answer» Answer :D | |
| 7048. |
Which of the following gases is the main constituent of natural gas. |
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Answer» METHANE |
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| 7049. |
A copper wire has diameter 0.5mm and resistivity of 1.6xx10^(-8)Omegam. what will be the length of this wire to make its resistance 10Omega? How much does the resistance change if the diameter is doubled ? |
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Answer» SOLUTION :`d=0.5mm=0.5xx10^(-3)m,P=1.6xx10^(-8)Omegam` `R=10Omega,l=?` `R=rhol/Atol=(RA)/rho` Therefore `l=(10xx22xx0.5xx0.5xx10^(-6))/(7xx4xx1.6xx10^(-8))=122.65m` If the diameter is doubled, then RESISTANCE BECOMES one FOURTH. |
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| 7050. |
Why do you think there should be equitable distribution of resources? What force would be working aganist an equitable distribution of our resources? |
| Answer» Solution :Natural resources of the EARTH MUST be distributed among the PEOPLE uniformly so that each and every one GETS his share of the resource. Human greed, corruption, and the lobby of the rich and powerful are the force working against an equitable distribution of resources. | |