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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.
| 901. |
Explain Mie Scattering. |
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Answer» SOLUTION :Mie scattering (i) Mie scattering takes place when the diameter of the scatterer is similar to or larger than the wavelength of the incident light It is also an elastic scattering. (ii) The AMOUNT of scattering is INDEPENDENT of WAVE length. Mie scattering is caused by pollen , dust , smoke , water droplets, and other particles in the lower PORTION of the atmosphere. (iv) Mie scattering is resposible for the white appearance of the clouds. When white light falls on the water drop , all the colours are equally scattered which together form the white light. |
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| 902. |
The fuel used in kamini reactor is |
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Answer» KALPAKKAM |
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| 903. |
How will you distinguish between a hard boiled egg and a raw egg by spinning it on a table top ? |
| Answer» Solution :For same extenal TORQUE, angular ACCELERATION of RAW eggs WILLE be smal than that of Hard BOILED egg. | |
| 904. |
Depending upon information given onpage 111, explain the various effects of thedisaster of railway accident. |
Answer» Solution :The effects of disastrous railway ACCIDENT : The effect will be ctependent upon tlw NATURE, of tlw accident that has occmTed. Whetherm it is a collapse of BRIDGE or due to DERAILMENT of the train, or due to collision of two moving trains, whether it is due to failure in signalling system, due to land slide or due to obstacle in the tunnel, that has to be understood. The impact of such railway accident will be dependent on the WAY that accident has occurred. Based on this impact the effects will take place. 
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| 906. |
An object is placed at a distance 20 cm from a convex lens of focal length 10 cm . Find the image distance and nature of the image . |
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Answer» Solution :u=- 20 cm f=10 cm `(1)/(f)=(1)/(V)-(1)/(u)` `(1)/(v)=(1)/(f)+(1)/(u)` `(1)/(v)=(1)/(10)+(1)/((-20))` `(1)/(v)=(1)/(10)-(1)/(20)` `v=(1)/(20)rArrv=20cm` Nature of the image REAL ENLARGED andinverted image. 
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| 907. |
When is the force experienced by a current-carrying conductor placedin a magnetic field largest? |
| Answer» Solution :THEFORCE experienced by a current-carrying conductor PLACED in a magnetic field is largest when the DIRECTION of current is at right angles to the direction of the magnetic field. | |
| 908. |
Differentiate between Somatic cell gene therapy and Germline gene therapy. |
Answer» SOLUTION :
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| 909. |
Amount of energy required to change liquid to gas and vice versa without any change in temperature is termed as .......... .. |
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Answer» LATENT HEAT of fusion |
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| 910. |
Device used to transform the voltage and currend levels of the generated power |
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Answer» |
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| 911. |
A person is unable to read a book pro-perly. From which defect is he suffering ? How to correctthis defect ? |
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Answer» Solution :The person is suffering from HYPERMETROPIA or long-sightedness. A long-sighted personcan see distant objects clearly, but cannot see DISTINCTLY objects lying closer than a certain distance. THUS, he cannot see clearly an object lying at 25 cm which is the least distance of distinct vision for a normal EYE. His far point is farther from the eye than 25 cm, say at 75 cm or so. Causes of the Defect. This defect is due to either : (i)the size of the eye ball becoming too short. (ii)the lens becoming too him , so that its focal length becomes abnormally large . Normal eye is able to focus on retina the rays emerging our from N. However, the defective eye is not able to focus the rays from near point of normal eye. It can focus the rays from near point of defective eye. From we conclude that more inclined rays are not focussed on reetina. Correction of this Defect.Such a defect is corrected by placing a CONVEX or converging lens of suitable focal length before the eye so that the rays diverging from N appear to come after refraction, from the near point . 
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| 912. |
For how long the effect after the occurrence of disaster? How? |
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Answer» Solution :a. The situations after a disaster MAY return back to normal within a short itme or the IMPACT may be long term and the after effects and SEVERITY increase with time. Both forest fire and drought can have long term after -effects. b. Forest fire causes air pollution and ALSO affects biodiversity. Therefore, it has long lasting effect on environment. c. Drought could be fatal if it lasts for a longer time. Duration of drought depends on the rainfall. Droughts can also result in various problems in crop production etc. that may have long term effects. Good MONSOON may help recover the drought situation. |
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| 913. |
Name the unit of electrical resistance and give its symbol. |
| Answer» SOLUTION :The ELECTRICAL RESISTANCE is GIVEN by the unit "ohm". Its SYMBOL is `Omega` | |
| 914. |
Assertion: Two bodies at different temperatures, if brought in contact both will be in mean temperature. Reason: The two bodies are made of different materials. |
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Answer» both the assertion and the REASON are trueand the reason is the correct explanation of the assertion. |
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| 915. |
The nature and size of an object placed focus F_(1) of a convex lens is : |
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Answer» VIRTUAL and erect, enlarged , IMAGE FORMED at `F_(2)` |
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| 916. |
What are the two technologies for harnessing solar energy ? |
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Answer» SOLAR PHOTOVOLTAICS and solar thermal |
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| 917. |
An electric iron of 1100 W is operated for 2 hours daily. What will be the electrical consumption expenses for that in the month of April ? (The electric company charges Rs. 5 per unit of energy.) |
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Answer» Time (t) = 2 hour To find:`""` Expense of using ELECTRIC iron in April month `"Formulae:i.Energy"="Power"xx"time"` `"II.Electrical consumption expenses "="Energy consumed "xx"charge per unit"` `"Calculation:From FORMULA (i),"` Energy consumed in one day `=1.1xx2=2.2kWh` `THEREFORE""` Energy consumed in the month of April (i.e. 30 days) will be, `"Energy "=2.2xx30=66kWh="66 unit..."(because "1 kWh = 1 unit")` From formula (ii), Electrical consumption expenses `=66xx5="Rs 330"` |
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| 918. |
Does a substance that heats up quickly have a high or a low specific heat capacity ? |
| Answer» Solution :A substance that HEATS up quickly has a low specific heat CAPACITY. HIGHER the specific heat capacity , lower is the increase in its temperature. | |
| 919. |
A freely suspended magnet always points along north-south direction. Why ? |
| Answer» Solution :This is because the earth BEHAVES as a GIANT magnet with its SOUTH pole lying near its geographical north pole and its north pole lying near its geographical south pole . | |
| 920. |
A ray of light when it falls normally on a surface |
| Answer» Solution :No bending of light RAY OCCURS. It MEANS light rays goes STRAIGHT from one medium to ANOTHER. | |
| 921. |
The values of current I flowing in a given resistor for the corresponding values or potential difference V across the resistor are given below Plot a graph between V and I and calculate the resistance of that resistor. |
Answer» SOLUTION :
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| 922. |
(a) An object is placed at a distance of 30 cm from a concave lens of focal length 15 cm. List four characteristics (nature, position, etc.) of the image formed by the lens. (b) You are provided with two convex lenses of focal length 15 cm and 25 cm respectively. Which of the two is of larger power ? Give reason for your answer. |
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Answer» SOLUTION :(a) The IMAGE of given object formed by the given concave lens is (i) VIRTUAL, (ii) erect, (iii) DIMINISHED in size, and (iv) is formed on same side of lens at a distance less than 15 cm from the lens. (b) Power of convex lens of focal length 15 cm is larger because its focal length is less and power of a lens is defined as reciprocal of its focal length (expressed in metre). |
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| 923. |
Draw ray diagrams showing the image fromation by a convex mirror when an object is placed. at infinity |
Answer» SOLUTION :
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| 924. |
Draw ray diagrams showing the image fromation by a convex mirror when an object is placed. at infinity distance from the mirror |
Answer» SOLUTION :
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| 925. |
The object is placed beyond prinvipal focus of simple microscope. |
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| 926. |
What is meant by electric current ? Name and define S.I. unil In a conductor electrons are flowing from B to A. What is the direction of conventional current ? Give justification for your answer. A steady current of 1 Ampere flows through a conductor. Calculate the number of electrons that flow through any section of conductor In 1 second. (Charge on electron1.6 xx 10^(-19) C) |
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Answer» Solution :DEFINITION of ELECTRIC CURRENT : Refer Quick REVIEW S.I. Unit of Current-ampere Definition of t Ampere : Refer Quick Review Direction of Current from A to B Justification: Refer to Quick Review `I = (ne)/(t) implies n= (Ixxt)/(e)` `=(1Axx1s)/(1.6xx10^(-19)C)=6.25xx10^(18)` |
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| 927. |
The weight of an object is maximum at _______________ on the surface of the Earth. |
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| 928. |
GSLV |
| Answer» SOLUTION :GEOSYNCHRONOUS SATELLITE LAUNCH VEHICLE. | |
| 929. |
What are magnetic field lines? How is the direction of a magnetic field at point determined? Mention two important properties of the magnetic field lines. |
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Answer» Solution :The space surrounding a magnet in which MAGNETIC force is EXERTED is called a magnetic filed. Magnetic field lines are the lines that are drawn at every point indicating the direction in which a NORTH pole would move if placed at that point. Thcy are determined by placing an imaginary hypothetical north pole at that point and finding the direction in which it would move due to the magnetic filed at that point of a COMPASS needle gets deflected when placed ear a magnet due to the magnetic force exerted by the magnet on it. Some important properties of magnetic field lines are: The tangent drawn at any point on the field line INDICATES the dircction in which a north pole would move if placed at that point The relative strength of the ficld is proportional to the degree of closeness of Ihe lines. The mure elustered they are the stronger thc ficld in the region. The magnetic field lines never intersect This is bccause a pole can move only in zone direction and if the lincs interseet they wourld have to move in two direction aimultaneously which is npossible. |
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| 930. |
Let the period of revolution of a planet at a distance R from a star be T. Prove that if it was at a distance of 2R from the star, its period of revolution will be sqrt(8)T. |
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Answer» Solution :Given: DISTANCE from sun `=R` TIME to ROTATION `=T` New distance `=2R` To find: New time `T_(N)=?` FORMULA: `(T^(2))/(R^(3))=k` Solution: Case (i) `(T^(2))/(R^(3))=k`…..i Case (ii) `(T_(N)^(2))=k` or `(T_(N)^(2))/(8R^(3))=k`............ii From i and ii `(T_(N)^(2))=(T^(2))/(R^(3))` `T_(N)^(2)=8T^(2)` `T_(N)=sqrt(8T^(2))` `T_(N)=sqrt(8)T` |
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| 931. |
Describe how you will locate a current-carrying wire concealed in a wall. |
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| 932. |
A concave mirror is used to form an image of the sun on a white screen. If the lower half of the mirror is covered with a black paper, the effect on the image formed on the screen would be |
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Answer» to make the image LESS bright than before |
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| 933. |
The effertive resistance for the given circuit in AB. . . . . . . . . |
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Answer» `1OMEGA` |
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| 934. |
Anaircraft is flying at a height of 3400m above theground . If the angle subtended at a ground observation point by the air-craft positions 10 . 0 s apart is 30^(@), what is the speed of the aircraft ? |
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Answer» Solution :Infig, O is the observation point at the ground, A and B are the positions of aircraftfor which`angle(AOB) = 30^(@)` . Draw a PERPENDICULAR OC on AB. Here OC = 3400 m and `angle(AOC) = angle(COB) = 15^(@)`. Time taken by aircraft from A to B is 10 s . In`Delta AOC , AC = OC tan 15^(@) = 3400 xx 0 . 2679 = 910 . 86` m AB + AC + CB = AC + AC = 2 AC ` = 2 xx 910 . 86` m Speed of the aircraft, v `= ("distance " AB)/("time")` ` = (2 xx 910 . 86)/(10) = 182 . 17 ms^(-1) = 182 . 2 ms^(-1)` . 
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| 935. |
Henry Becequerel discovered uranium. |
| Answer» SOLUTION :HENRI Becequerel DISCOVERED RADIOACTIVITY | |
| 937. |
Swarali has got the following observations while doing an experiment. Answer her questions with the help of observations. Swarali observed that the light bent away from the normal , while travelling from a denser medium to a rarer medium. When Swarali increased the values of the angle of incidence (i ), the values of the angle of refraction (r ) went on increasing. But at a certain angle of incidence, the light rays returned into the denser medium. So, Swarali has some question. Answer them. (a) Name this certain valueof i. What is the value of r at that time ? (b ) Name this process of returning of light in the denser medium. Explain the process. |
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Answer» SOLUTION :(a) Critical angle `r = 90^(@)` (B) Total internal reflection. As light GOES from a denser to rarermedium, if the value of the angle of incidence increases, then the value of the angle of refraction ALSO increases. But after a specific angle of incidence called the critical angle, the light gets reflected back into the denser medium. |
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| 938. |
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is (a) towards south(b) towards east (c ) downward(d) upward |
Answer» Solution : DIRECTION of current is also towards west and FORCE is towards north, then using Fleming.s LEFT hand rule, the direction of MAGNETIC field is UPWARDS. |
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| 939. |
List two sources of magnetic fields . |
| Answer» SOLUTION :Magnet , movingcharges in SPACE , ELECTRIC current through CONDUCTOR . | |
| 940. |
If the resistance in a circuit with constant voltage increases, the current will: |
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Answer» increase |
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| 941. |
………..helps the students to improve concentration in their studies. |
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| 942. |
In the experiment described on page 64 of your textbook, the wire moves through the ice slab. However, the ice slab does not break. Why? |
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Answer» Solution :i. a. When the wire with weights attached to its two ends is placed on the ice slab, its WEIGHT acts along very small area of CONTACT between the wire and ice. b. As a result, pressure gets applied on that PART of ice-slab. . C . This lowers the melting point of ice below `0^(@)C` and ice is CONVERTED into WATER. d. The wire cuts through water and shifts downward. e. As the wire displaces, pressure applied by wire on ice slab vanishes and its melting point restores to `0^(@)C` causing freezing of ice. f. In this manner, due to regelation wire moves through the ice slab completely without breaking it. |
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| 943. |
What change will you observe it you test soap with Litmus paper (red and blue) |
| Answer» Solution :SOAP is basic in NATURE and hence TURNS red LITMUS blue. | |
| 944. |
What is the Cartesian sign convention used for spherical mirrors? |
Answer» Solution :Accoriding to the Cartesian sign convention, the optical centre(O) is taken to be the origin. The principal axis is the X-axis of the frame of reference. The sign convention is as FOLLOWS.  1.The object is ALWAYS placed on the left of the lens. All DISTANCE parallel to the principal axis are measured from the optical centre(O). 2. The distance measured to the right of O are taken to be positive, while those measured to the left are taken to be negative. 3.Distances perpendicular to the principal axis and above it are taken to be positive. 4.Distances perpendicular to the principal axis and below it are taken to be neagative. 5.The focal LENGTH of a convex lens is positive while that of a concave lens is negatice. |
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| 945. |
A dynamo having split rings is its armature is inducing certain current in the internal circuit. The device that can be used to increase this current is: |
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Answer» RECTIFIER |
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| 946. |
Which of the following in not the source of green energy? |
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Answer» WIND |
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| 947. |
Draw a ray diagram of a simple microscope and its working principle |
Answer» Solution : Working principal : A simple microscope is used to obtain small MAGNIFICATIONS. It is usally used for study of microscopic algae, fungi and biological specimen. LIGHT from a light source (mirror) passes through a thin transparent OBJECT (Figure 4.2). A biconvex lens magnifies the size of the object to get an enlarged virtual image. The image is VIEWED from the other SIDE. |
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| 948. |
While going down the second group, the reactivity of the alkaline earth metals increases. |
| Answer» SOLUTION :The reaction of alkaline earth metal with water is `M+2H_(2)OrarrM(OH)+H_(2).` While going down the SECOND group as `Be rarrMgrarrCararrSr rarrBa,` the GRADATION in this chemical property of the alkaline earth metals is seen. While going down the second group the REACTIVITY of the alkaline earth metals goes on increasing thereby the ease with which this reaction takes place ALSO goes on increasing. Thus, Beryllium (Be) does not react with water. Mg (Magnesium) reacts with steam. Whereas calcium (Ca), strontium (Sr) and barium (Ba) reacts with water at room temperature with increasing rates. | |
| 949. |
When a ray of light travels fromglass slab to air and strikes normally the surface of separation ,then it "…..................". |
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Answer» BENDS TOWARDS the normal |
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| 950. |
Dimensional formula for curie is |
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Answer» `[M° L T^(–1)]` `=(DN)/(DT)=("Number")/("TIME")` `=[T^(-1)]or[M^(@)L^(@)T^(-1)]` |
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