InterviewSolution
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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.
| 9001. |
How is nuclear energy generated during nuclear fusion ? |
| Answer» SOLUTION :During FUSION , two NUCLEI of light element COMBINE to FORM a heavy nucleus with the release of tremendous amount of energy . There is some loss of mass during fusion process which is transformed into tremendous amount of energy. | |
| 9002. |
In Raman Scattering , the scattered light contains the lines having frequency less than incident is Antistokes. |
| Answer» Solution :CORRECT statement- In Raman scattering the SCATTERED LIGHT contains the lines having frequency LESS than incident is STOKES. | |
| 9003. |
The resistance of a wire of length 10 cm is 2 ohm, then its conductance is. . . . . . . . . . |
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Answer» 0.5 OHM |
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| 9004. |
Assertion: Cannot see the distant object clearly.Reason: The far point of an eye suffering j, from myopia is less than infinity. |
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Answer» both correct |
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| 9005. |
What is the difference between space and sky? |
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Answer» Solution :1.Sky is the region in which sunlight is scattered in the earth's atmospheremaking it visible from the surface of the planet, while space is EVERYTHING beyond that. 2. During day light, the sky appears to be BLUE while space is always dark. 3. Sky has atmosphere while space does not have atmosphere. |
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| 9006. |
On adding zinc granules to freshly prepared ferrous sulphate solution, what is it observed? |
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Answer» SOLUTION : It is OBSERVED that the solution TURNS from green to colourless and a black coating is formed. This is because zinc being more REACTIVE than iron displaced it from `FeSO_(4)` and forms colourless solution of `ZnSO_(4)` along with a black coating of FE. `FeSO_(4)+Zntounderset(("Colourless"))+underset(("Black"))(Fe)` 
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| 9007. |
Magnetic field decreases we go away from a magnet. |
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Answer» |
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| 9008. |
A person is advised to wear spectacles with convex lenses. State the defect of vision he is suffering from. |
| Answer» SOLUTION :The PERSON is SUFFERING from HYPERMETROPIA. | |
| 9009. |
Concave lens is used as 'Magnifying lens'. |
| Answer» SOLUTION :CORRECT STATEMENT - Convex lens is USED as magnifying lens. | |
| 9010. |
You are given a concave mirror of focal length 20 cm and a candle. Where will you hold the candle to form a virtual, erect and magnified image of the candle flame ? Draw the necessary ray diagram. |
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Answer» Solution :Here, `f= - 20 CM`. To form a virtual, ERECT and magnified image of candle flame, the flame is to be held at a distance less than `20 cm` from the concave mirror, in front of the mirror. In the ray diagram , A'B' is virtual, erect and magnified image of object AB held in front of the concave mirror at a distance less than `PF=20cm`. 
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| 9011. |
You are given a plane mirror, a concave mirror and a convex mirror. How do you distinguish each of them ? |
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Answer» Solution :The nature of image FORMED when we look into a (a) Plane mirror - SIZE of the image of our FACE same. (b)CONCAVE mirror - When the face is held a little away from the mirror, the image is inverted. When held very close to the face, the image appears erect. (c ) CONVEX mirror - the image appears erect but diminished in size for any position of the face. |
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| 9012. |
In the experiment "To study fission in Amoeba and budding in yeast". Mention the difference between the two reproduction methods based on parental identity only. |
| Answer» Solution :In BINARY FISSION the parental identity is lost. In BUDDING method the parentalidentity is not lost as its CELLS continue to LIVE. | |
| 9013. |
Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropia eye is 1m. What is the power of the lens required to correctt this defect ? Assume that the near point of the normal eye is 25 cm. |
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Answer» <P> Solution : The object placed at 25 CM from the CORRECTING lens must produce a virtual IMAGE at. 1m or 100 cm. Object distance = u = - 25 cm, image distance = v = -100 cm. By lens formula, `(1)/(f) = (1)/(v) - (1)/(u) = (1)/(-100) -(1)/(-25) = -(1)/(100) + (1)/(25) = +(3)/(100)` or `f = +(100)/(3) cm = +(1)/(3)m` POWER, `P = (1)/(f) = +(3)/(1) = +3D`. |
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| 9014. |
Two identical resistors each of resistance 12 Omega are connected (i) in series (ii) in parallel, to a battery of 6 V. Calculate the ratio of power consumed in the combination of resistors in the two cases. |
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Answer» Solution :`R_(1)=R_(2)=12Omega` V=6V `R_(s) = R_(1)+R_(2)` `=(12+12)Omega= 24 Omega` `(1)/(R_(p))=(1)/(12)+(1)/(12)` or `"" (1)/(R_(p))=(2)/(12)` `:. R_(p)=6Omega` Power consumed by series combination `=P_(s)` `=(V^(2))/(R_(s))= (6xx6)/(24)` =1.5 W Power consumed by parallel combination ` =P_(p)=(V^(2))/(R_(p))=(6xx6)/(6)` = 6 W Ratio =` (P_(s))/(P_(p)) = (15)/(6) = (1)/(4) = 1:4` |
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| 9015. |
1.38xx10^(-23) JK^(-1): Boltzmann Constant :: ___________: universal gas constant |
| Answer» SOLUTION :`8.31 J MOL^(-1) K^(-1)` | |
| 9016. |
Do positive charges move in a conductor ? Can you give an an example of this ? |
| Answer» SOLUTION :In SOLID conductors, positive ions do not move. eg : Copper, but in liquid conductors positive ions can move. eg : `CuSO_(4)(sol)` | |
| 9017. |
Explain an activity to show that a current-carrying conductor experiences a force when placed in a magnetic field. |
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Answer» Solution :A CURRENT-carrying conductor experiences a magnetic force due to a magnetic FIELD. The force is maximum when the conductor is placed perpendicular to the direction of magnetic field. To demonstrate the force we perform the following experiment: Experiment: Take a small sized aluminium rod AB of length about 5 cm. Suspend the rod AB horizontally from a rigid stand using two connecting wires. Place a STRONG horse-shoe magnet NS in such a WAY that the rod AB LIES between the poles of the magnet. Let the north pole N of magnet lies below the rod and the south pole S lies above the rod as shown in Fig. 13.27. Thus, a magnetic field directed in vertically upward direction is present.  Completetheelectrical circuit ofaluminium rod AB byconnectingit in series witha battery , KeyK anda variableresistance . Put thein key Kso that an eletric currentbegins to flow through the aluminium rod from end B to end A . We observe thaton passingcurrentthe rod AB is displaced towards the left . It showns thatthe aluminium rodis experiencinga mechanical force due towhich it is beingdeflected . Directionofdeflectionis given byFleming.s left handrule . Effect of change in directionof current: Reverse the connections of batteryso that on applyingplugin Key K , currentflows , in thealuminium rod from A to B. We now find the rod AB isdeflectedtoward the right. Thu s, by reversingthe direction of current , direction of force is also reversed . It is accordancewith Fleming.s left- handrule . Effect of changein direction of magneticfield : Now reverse the direction of magnetic fieldtoverticallydownward direction. For thispurposesuspend, the horse - shoe magnet in such a way that N-poleof magnet lies abovethealuminium rod AB and S-poleof magnet lies belowthe rod . It nowcurrentinaluminium rod is flowingfromA to B , thenthe rodis flowing fromA to B , thenthe rodis deflected towards let . It showthat directionof deflection(or thedirectionof force) is reversed on reversingthedirectionof magneticfield . |
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| 9018. |
Explain centripetal force with suitable example. |
Answer» Solution :The force on an object revolving in a circular path towards the centre is called CENTRIPETAL force. e.g. A STONE tide to the string MOVES in a circular path and its velocity is TANGENTIAL. |
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| 9019. |
…………..is used to findthe directionof a currentinduced in a circuit . |
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Answer» Fleming.sleft - handrule |
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| 9020. |
Explain the process of energy generation in the sun and name the scientist who was the first to propose it. |
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Answer» Solution :Thermonuclear reactions are said to power the sun. t is believed that deuterium ATOMS [heavier isotope of hydrogen] are FUSED together under conditionsof the order of millions of Kelvin DEGREES and Pascals to release an extremely HIGH amount of energy. It was Hans BETHE who had first given the reaction lin the sun. `""_(1)^(2)H + ""_(1)^(2) H rarr ""_(2)^(3) "He" + ""_(0)^(1) n + ` Energy |
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| 9021. |
Give scientific reasons: c. We can not clearly see an object kept at a distance less then 25 cm from the eye. (OR) If we bring an object closer than 25 cm from the eye, why can we not see it clearly even though it subtends a bigger anble at the eye ? |
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Answer» Solution :1 For a normal human eye, the near point is at 25 cm. This is the distance at which an object is clearly VISIBLE with any stress on the eye. 3. When we bring the object closer than 25 cm, the eye lens cannot DECREASE its focal length BEYOND a certain limit. 4. THEREFORE, we cannot see the object clearly, even though it subtends a bigger angle at the eye. |
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| 9022. |
Which of the following coloured light has the least speed in glass prism ? |
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Answer» violet |
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| 9023. |
Mendel crossed a tall pea plant producing round seeds and a short pea plant producing wrinkled seeds. Write the plant type of F_(1) and F_(2) progenies he got and the conclusion he had drawn from such a cross |
| Answer» Solution :Law of independent Assortment and Dihybrid INHERITANCE`F_(1)` : All plants were TALL with round seeds. | |
| 9024. |
A solar water heater cannot be used to get hot water on |
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Answer» a sunny day |
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| 9025. |
At constant pressure, volume of given mass of gas is proportional to ... |
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Answer» temperature |
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| 9026. |
A ___________ bulb has no filament. |
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Answer» cadmium |
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| 9027. |
What are the concept prepared by the Galileo ? |
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Answer» SOLUTION :(i) The natural STATE of all earthly bodiesis eitherthe state of rest or the stateof uniform motion. (ii) An body in motion will continue to be in the samestate of motion as LONG as no external force is applied . (iii) When forceis appliedon bodies , they resistany changein their state . This property of bodies is called " inertia " . (iv) When dropped from a height in vaccum , bodiesof different SIZE ,shape and mass FALL at the samerate and reach the ground at the same time . |
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| 9028. |
Listtwo distinguishing features between overloading and short circuiting . |
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Answer» Solution :If the live and neutral wires come in CONTACT directly or INDIRECTLY due to defective or damaged wiring in an appliance, the resistance of he circuit becomesalmost zero and a HUGE current flows through the circuit. Thisis called shortcircuiting. It may damage the appliance and also cause heating oftheline wires, electric SPARK, fire, etc. Short circuiting can be prevented by using an electric fuse in a live wire. Overloading occurs when many appliances are switched on at the same time and theydraw a large current [exceeding 5 Afor lighting circuit and15 A for heating circuit] from the mains, or due to an accidental hike in the supply VOLTAGE. This causes overheating of the wires which may result in fire or damage theappliances. This can be avoided by using an electric fuse in live a wire. |
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| 9029. |
Weight of the body acquireddue togravity is _________. |
| Answer» SOLUTION :apparentweight | |
| 9030. |
When do you say that two or more resistors are connected in series ? |
| Answer» Solution :TWO or more RESISTORS are said to be CONNECTED in series if the same CURRENT flows through them. | |
| 9031. |
In case of a virtual and erect image, the magnification of a mirror is |
| Answer» Answer :A | |
| 9032. |
Which fuel is used in thermal power plant? What are the problems associated with this type of power generation? |
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Answer» Solution :Coal is used fuel in thermal power plant. Problems associated with thermal power generation : (i) Inthermal power plant coal is burned which causes air pollution. (II) Gases LIKE carbon dioxide , sulphur OXIDE and nitrogen oxide which are harmful to health are emitted during the burning of coal. (iii) Soot particles are also released ento the problems related to the respira tory system. (IV) Coal which is used as a fuel in thermal power plant is available in limited quantity and will GET ddepleted in the future. |
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| 9033. |
The bluish colour of water in deep sea is due to. |
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Answer» the presence of angae and other plants found in water |
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| 9034. |
The amount of heat required for the above operation is |
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Answer» 380 cal |
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| 9035. |
Put the beaker on a stand and heat the ice using a burner, as shown in the figure on page 62 of your textbook. |
Answer» SOLUTION : The GRAPH of TEMPERATURE versus time is SHOWN below. 
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| 9036. |
Two magnets are lying side by side as shown below. Draw magnetic field line between poles P andQ. |
Answer» SOLUTION :
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| 9037. |
Explain any three application of Torque. |
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Answer» Solution :APPLICATION of Torque : (i) Gears: A gear is a circular wheel with teeth around its rim. It helps to change the SPEED of rotation of a wheel by changing the torque and helps to transmit power. (ii) Seasaw : Most of you have played on the seasaw. Since there is a difference in the weight of the persons sitting on it, the heavier person lifts the lighter person. When the heavier person comes closer to the pivot point (fulcrum) the distance of the line of ACTION of the force decreases. It causes less AMOUNT of torque to act on it. This enables the lighter person to lift the heavier person. (iii) Steering Wheel : A small steering wheel enables you to manoeuore a car easily TRANSFERRING a torque to the wheels with less effort. |
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| 9038. |
Toproduce a displacement ________ is required . |
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Answer» Acceleration |
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| 9039. |
A resistance of 20 ohms has a current of 2 amperes flowing in it. What potential difference is there between its ends? |
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Answer» Solution :POTENTIAL difference is `IxxR` Given I = 2 AMPERES, R = 20 ohms THEREFORE, potential difference = `IxxR=2xx20=40` volts |
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| 9040. |
Figure below shows a wheel barrow of mass 15 kg carrying a load of 30 kgf with its centre of gravity at A. the points B and C are the centre of wheel and tip of the handle such that the horizontal distance AB=20 cm and AC=40 cm. Find: (a) the load arm, (b) the effort arm, (c) the mechanical advantage, and (d) the minimum effort required to keep the leg just off the ground. |
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Answer» (b) 60 cm, (C) 3 (d) 15 KGF. |
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| 9042. |
How will you prevent soil erosion? |
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Answer» Solution :Physiological effects of ethylene : (i) It promotes the ripening of fruits E.g. TOMATO, Apple, Mange , Banana etc. (ii) It breaks the dormancy of buds, seeds and storage organs. (ii) Autogamy or self POLLINATION is the transfer of pollen grains from the ANTHER to the stigma of same flower or another flower borne on the same PLANT. Eg. Hibiscus. (iii) (i) Retain vegetation cover, so that soil is not exposed. (ii) Cattle grazing should be controlled. (iii) Crop rotation and soil MANAGEMENT improve soil organic matter. (iv) Run off water should be stored in the catchment. (v) Reforestation, terracing and contour ploughing. (vi) Wind speed can be controlled by planting trees in the form of a shelter belt. |
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| 9043. |
Explain the differences : AC generator and DC generator |
Answer» SOLUTION :
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| 9044. |
Earthquakes, Volcanoes, Droughts, Deforestation |
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Answer» SOLUTION :Deforestation Deforestation is a MANMADE factor affecting ENVIRONMENT, whereas others are natural FACTORS affecting environment. |
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| 9045. |
Name the two major components present in the left-over slurry of a biogas plant. |
| Answer» SOLUTION :NITROGEN and PHOSPHORUS. | |
| 9046. |
An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. At what distance from the mirror should a screen be placed, so that a sharp focussed image can be obtained?Find the size and the nature of the image. |
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Answer» SOLUTION :`h_(1)=7CM` `u=-27cm` `f=-18cm` `v=?` `h_(2)=?` `1/f=1/v+1/u` `v=(uf)/(u-f)` `=486/(-9)` `v=-54cm` `(h_(2))/(h_(1))=-v/u` `h_(2)=(-v)/uxxh_(1)` `=((-54)/(-27))xx7` `h_(2)=-14cm` |
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| 9047. |
How does sound reach our ears from various sources? |
| Answer» SOLUTION :SOUND REACHES our ears in the form of transverse waves or vibrations from its SOURCE of production. | |
| 9048. |
What is meant by triplet codon? |
| Answer» Solution :The code for each amino ACIDS always CONSISTS of three nucleotides which is KNOWN as TRIPLET codon. | |
| 9049. |
State with reasons whether the following sentences are true or false. If a spacecraft has to be sent away from the influence of earth's gravitational field, itsvelocity must be less than the escape velocity. |
| Answer» Solution : FALSE - If the escape velocity is higher than SPACE CRAFT velocity , then the spacecraft will not go outside of EARTH. | |