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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.
| 3201. |
Where should an object be placed in front of a convex lens to get a real image of the size of the object ? |
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Answer» At the principal focus of the LENS |
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| 3202. |
How make light years are there in one metre? |
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Answer» Solution :`1Iy=9.46xx10^(15)m` `1m=(1)/(9.46xx10^(15))=1.057xx10^(-16)Iy` |
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| 3203. |
How do you find experimentally the refractive index of material of a prism ? |
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Answer» Solution :Aim: To find the refractive index of a prism. Material required : Prism, piece of white chart of size `20xx20` cm, pencil, pins, scale and protector. Procedure : 1) Take a prism and place it on the white chart in such a way that the triangular base of the prism is on thechart. 2) Draw a line around the prism base using pencil. Remove the prism and name the VERTICES of the triangle as formed as P, Q and R. 3) Measure the angle between PQ and PR. This is the angle of the prism (A). 4) Mark M on the side of `DeltaPQR` and also draw a perpendicular to PQ at M. 5) Draw a line with `30^(@)` to the normal at M. This line denotes the incident ray. Note the value in the table.   6) Place the prism in its position (`DELTA`) again. 7) Now fix two pins vertically on the line at the points A and B. 8) Look for the angles of pins through the prism from the other side (PR) and fix another two pins at points C and D in such a way that all the four pins appear to lie along the same straight line. 9) Now remove the prism and take out pins. 10) Draw a line joining C and D and extend it to meet PR at N. This is the emerging ray. 11) Draw a normal to PR at N . 12) The angle between the normal at N and emergent ray is the angle of emergence . Measure this angle and note its value in the above table. 13) Now join the points M and N by a straight line. The line passing through A,B,M,N,C and D represents the path of light when it suffers refraction through the prism. 14) Extend both incident and emergent rays till they meet at point 'O'. 15) Measure `angleMON`. This is the angle of deviation, denoted by 'd'. Note this value in the table. 16) Repeat the process for different angles of incidence and measure corresponding angles of deviations. 17) Take angle of incidence along X-axis and the angle of deviation along y-axis . Draw a graph. 18) We obtaina curve. 19) Draw a tangent line to the curve, parallel to X-axis , at the lowest point of the graph. The point where this line cuts Y-axis GIVES the angle of minimum deviation (D). (20) The refractive index of prism n= `(sin((A+D)/(2)))/(sin((A)/(2)))` (21)Using this formula , we can measure the refractive index of the material of the prism. 
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| 3204. |
Why are thermal power plants set up near coal and oil fields? |
| Answer» SOLUTION :It MINIMIZES the cost of transportation and therefore it reduces the cost of PRODUCTION also. Transporting electricity over WIRES is lot cheaper than transporting raw materials. | |
| 3205. |
Complete the Chart : Now-a-days , we are observing the environmental degradation everywhere. Complete the flow chart given besides with the help of environment |
Answer» SOLUTION :
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| 3206. |
How do you measure the angle of vision ? |
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Answer» Solution :1) Collect a few wooden sticks orPVC pipes and make pieces of 20 cm, 30 cm ,40 cm,50cm form them . 2) Place a retort STAND on a table and stand near the table such your head is beside the vertical stand. 3) Adjust the clamp on the horizontal rod and fix it at a distance of 25 cm from your eyes. 4) Ask one of your friends to fix a wooden stick of 30 cm height to the clamp in a verticalposition as shown in the figure. 5) Now keeping your vision parallel to horizontal rod of the stand, ty to see the top and bottom stick kept in vertical position. 6) If you are not able to see both ends of the stick at this distance (25 cm) adjust the vertical stick on the horizontal rod till you are able to see both ends of the stick at this position with the help of the clamp. 7) Without changing th position of the clamp on the horizontal rod, replace this stick of 30 cm length with other sticks of various lengths one by one and try to see the top and bottom of the stick simultaneously without any change in the position of EYE either upward ,downwards or side ways. 8) From the given figure, you notice that you will be able to see only the part (EF) of the object A' and B'because the rays coming from E and F enter your eye. 9) These rays FORMS angle at the eye. If this angle is below `60^(@)` . we can see the whole object.If this angle is above `60^(@)`, then we can see only the part of the object. 10) The maximum angle, at which we are able to see the whole object is called angle of vision. 
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| 3207. |
The work of 146 kJ is performed in order to compress one kilo mole of a gas adiabatically and in this process the temperature of the gas increases by 7^@C. The gas is (R=8.3ml^-1Jmol^-1K^-1) |
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Answer» Triatomic `T_2 – T_1 = 7^@C, R = 8.31 "mole"^(-1) K^(-1)` `= 8.3 xx 10^(3) "J KILOMOLE"^(-1) (K^-1)` As `w= (R(T_2 - T_1))/(1-gamma)` `-146.xx10^(3) = (8.3xx10^3xx7)/(1-gamma)` `gamma-1=(8.3xx10^3xx7)/(146xx10^3)=0.40` `gamma=1.40` The gas must be diatomic. |
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| 3208. |
Explain the working of the eye. |
Answer» Solution : (i) The transparent LAYER cornea bends the light rays through pupil located at the centre part of the Iris. (II) The adjusted light passes through the eye lens. Eye lens is convex in nature. So, the light rays from the objects are converged and a real and inverted image is formed on retina. (III) Then, retina passes the received real and inverted image to the brain through optical nerves. Finally, the brain SENSE it as ERECT image. |
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| 3210. |
(i) List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function. (ii) Write the function of retina in human eye. (iii) Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death? |
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Answer» Solution :(i) The pupil is the perforation in the iris. It is the pupil (or aperture of the eye) through which light enters our eyes. The RELAXATION and CONTRACTION of the muscular fibres of the iris regulate the opening and CLOSING of the pupil. Hence, it is the pupil that controls the amount of light entering our eyes. (ii) The retina is the "film" of the eye like the film of a camera. The retina is the light-sensing part of the eye. It converts the incident light into electrical signals and sends them to the brain. (iii) Eyes of a dead person can be donated to a person having corneal blindness. It will help him/her to see the world. We can also REGISTER ourselves to donate our eyes. The organisations that put up eye donation camps preserve our eyes after our DEATH and donate them to the needy. |
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| 3211. |
Who discovered natural radioactivity ? |
| Answer» SOLUTION :HENRI Becquerel was discovered natural radioactivity. | |
| 3212. |
i. Will the velocity of a stone thrown vertically upwards remian constant or will it change with time? How will it change? ii. Why doesn't the stone move up all the time? Why does it fall down after reaching a certain height? iii. What does its maximum height depend on? |
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Answer» Solution :i. The velocity of the stone thrown vertically UPWARD will not remain constant. It will decrease with time tillit becomes zero. II. When the stone is thrown vertically upwards, the gravitational force tries to pull it down and reduces its velocity. due to this constant downward pull, the velocity becomes zero after a while. The pull continues to be EXERTED and teh ston starts MOVING vertically downward towards the centre of the eath under the infuence. iii. Tee maximum height hte stone can achieve DEPENDS on the initial velocity with which the stone is thrown vertically upwards. |
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| 3213. |
Mention some uses of electromagnets . |
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Answer» Solution :Electromagnets are used in : i] INDUSTRIES to lift heavy magnetic OBJECTS and to SEPARATE magnetic materials from wastes ii] Transformers which work on the principle of electromagneticinduction iii] Electric bells, relays, electric SWITCHES, tape RECORDERS, etc. |
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| 3214. |
Power of lens is -0.5 D, then the focal length is………………… |
| Answer» Answer :C | |
| 3215. |
What is a solenoid ? |
| Answer» Solution :A coil of many circular turns of INSULATED copper wire WRAPPED CLOSELY in the SHAPE of a cylinder is called solenoid. | |
| 3216. |
In our house hold electric circuit all appliances are connected in series. |
| Answer» SOLUTION :False- In household ELECTRIC CIRCUIT all the appliances are connected in PARALLEL only. | |
| 3217. |
A student traces the path of a ray of light through a triangular glass prism for different values of angles of incidence. On analysing the ray diagrams, which one of the conclusions is he likely to draw ? |
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Answer» The emergent ray is parallel to the INCIDENT ray. |
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| 3218. |
Why do we have to bring a small object near the eyes in order to see it clearly ? |
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Answer» Solution :a. The APPARENT size of an object depends on the ANGLE subtended by the object with the eye. b. The object appears larger if it subtends GREATER angle with the eye. HENCE, to see a small object clearly, we have to bring it closer to the eyes so that it subtends a greater angle with the eyes. |
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| 3219. |
How to liquor produced ? |
| Answer» Solution :LIQUOR is PRODUCED from alcohol obtainded through FERMENTATION of different substances. | |
| 3220. |
If vecA=3hati+4hatj and vecB=7hati+24hatj, find a vector having the same magnitude as vecB and parallel and same direction as vecA. |
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Answer» Solution :`|vecA|=sqrt(3^(2)+4^(2))=5` also `|vecB|=sqrt(7^(2)+24^(2))=25` desired VECTOR `=|vecB| hatA=25xx(3hati+4hatj)/(5)` `=5(3hati+4hatj)=15hatj+20hatj`. |
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| 3221. |
How many calories of heat will be absorbed when 2kg of ice at 0^(@)C melts ? ( Specific latent heat of fusion of ice = 80 cal //g) |
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| 3222. |
Briefly explain the observed blue colour of clear sky. What would have happen if there is no atmosphere on the earth? |
| Answer» Solution :The air molecules and other fine particles present in EARTH.s atmosphere have size EVEN smaller than the wavelength of visible light. As a result, these are more effective in scattering light of shorter WAVELENGTHS at the blue end of spectrum. Amount of scattering of red light is comparatively very small. So when sunlight passes through atmosphere of earth, blue light is scattered much more and SPREADS in all directions. As a result, the sky appears as blue to us. If there had no atmosphere on the earth then there would have been no scattering of sunlight and the sky would have LOOKED dark. | |
| 3223. |
Construction of a compound microscope: (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object0 and the eyepiece (the lens directed towards the eye) . Both the lenses are small in size , but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length . The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand . The principal axes of the objective lens and the eyepiece are along the same line.The distance between the object and the objective lens can be changed with a screw. use : This microscope is used to observe blood cells, microorganism , etc. State which distance is adjusted to observe the object with a compound microscope. |
| Answer» SOLUTION :To observe the object with a compound microscope, the DISTANCE between the object and objective LENS is adjusted. | |
| 3224. |
Construction of a compound microscope: (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object0 and the eyepiece (the lens directed towards the eye) . Both the lenses are small in size , but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length . The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand . The principal axes of the objective lens and the eyepiece are along the same line.The distance between the object and the objective lens can be changed with a screw. use : This microscope is used to observe blood cells, microorganism , etc. State the nature of the final image in a Compound microscope relative to the object. |
| Answer» Solution :In a compound microscope, the FINAL image is highly enlarged, INVERTED and virtual RELATIVE to the OBJECT. | |
| 3225. |
Construction of a compound microscope: (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object0 and the eyepiece (the lens directed towards the eye) . Both the lenses are small in size , but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length . The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand . The principal axes of the objective lens and the eyepiece are along the same line.The distance between the object and the objective lens can be changed with a screw.use : This microscope is used to observe blood cells, microorganism , etc. State the use of a compound microscope |
| Answer» Solution :A COMPOUND MICROSCOPE is used to OBSERVE bloodcells, MICROORGANISMS, ETC. | |
| 3226. |
Define least count with one example. |
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Answer» SOLUTION :The smallest value that can be measured by the measuring INSTRUMENT is called its least COUNT. For example : if an instrument has 10 DIVISIONS starting from zero UPTO to mark 1 then least count =`(1)/(10)= 0.1` |
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| 3227. |
Construction of a compound microscope: (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object0 and the eyepiece (the lens directed towards the eye) . Both the lenses are small in size , but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length . The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand . The principal axes of the objective lens and the eyepiece are along the same line.The distance between the object and the objective lens can be changed with a screw. use : This microscope is used to observe blood cells, microorganism , etc. In a compound microscope, which lens has greater focal length? |
| Answer» SOLUTION :In a COMPOUNDMICROSCOPE,the EYEPIECE hasgreater FOCAL LENGTH. | |
| 3228. |
Construction of a compound microscope: (1) A compound microscope consists of a metal tube fitted with two convex lenses at the two ends. These lenses are called the objective lens (the lens directed towards the object0 and the eyepiece (the lens directed towards the eye) . Both the lenses are small in size , but the cross section of the objective lens is less than that of the eyepiece. The objective lens has a short focal length . The focal length of the eyepiece is more than that of the objective lens. (2) The metal tube is mounted on a stand . The principal axes of the objective lens and the eyepiece are along the same line.The distance between the object and the objective lens can be changed with a screw. use : This microscope is used to observe blood cells, microorganism , etc. Where do you place the object to be observed With a compound microscope? |
| Answer» Solution :In ACOMPOUND MICROSCOPE, the object to beobservedis PLACED in front of the OBJECTIVE lens, slightly beyond the focus of the objective lens. | |
| 3229. |
When an object is kept within the focus of a concave mirror, an enlarged image is formed behind the mirror. This image is : |
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Answer» REAL. |
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| 3230. |
Define: Fast speed reaction . |
| Answer» Solution :The REACTION which is COMPLETED in short time i.e. occurs rapidly is CALLED FAST SPEED reaction. | |
| 3231. |
Which of the following is used to produce products useful to humans by biotechnology techniques? |
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Answer» enzyme from ORGANISM |
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| 3234. |
Which one of the following statements is not true about nuclear energy generation in a nuclear reactor ? |
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Answer» Energy is obtained by a process called NUCLEAR fission |
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| 3235. |
There lenses having power 2, 2.5 and 1.7 D are kept touching in a row. What is the total power of the lens combination? |
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Answer» SOLUTION :D = `D_(1) + D_(2) + D_(3)` D = 2 + 2.5 + 1.7 = 6.2 D |
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| 3236. |
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of eletric charge that flowsthrough the circuit. |
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Answer» Solution :We are GIVEN, I = 0.5 A, t = 10 min = 600 s. Now, `I =Q/t` `:. Q = "It"` `= 0.5 A xx 600s` =300C |
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| 3237. |
Children are facing problem of loneliness and menta stress dur to nuclear family and parents staying outdoors for job. |
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| 3238. |
What is a solar cell ? Why and how is a solar cell application and panel prepared ? List two limitations of these panels. |
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Answer» Solution :Solar cell is a device that converts solar energy into electricity. Since the OUTPUT of a single solar cell is QUITE small, a large number of solar cells are combined using silver for the interconnection. This arrangement of solar cell is called solar panel that can deliver enough electricity for practical use. USES : (i) Artificial satellites. (II) Traffic lights, calculators (iii) Radio and wireless TRANSMISSION (iv) At TV relay station. Limitations: (i) Highly expensive (ii) Fabrication is a complex process (iii) Low efficiency. |
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| 3239. |
Explain the parallel connection of series resistors. |
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Answer» Solution :(i) Let `R_(1)` and `R_(2)` be connected in PARALLEL to to give an effective resistance of RP1. (ii) If you consider a connection of a set of series resistors connected in a parallel circuit, we get a parallel - series circuit. (iii) Let `R_(1)` and `R_(2)` be connected in series to give an effective resistance of `R_(S1)`. (iv) Silimarly, let `R_(3)` and `R_(4)` be connected in series to give an effective resistance of `R_(S2)`. (v) Then, both of these serial segments are connected in parallel.  Using equation `R_(S)=R_(1)+R_(2)+R_(3)` we get `R_(S)=R_(1)+R_(2)+R_(3)` `R_(S1)=R_(1)+R_(2)`, `R_(S2)=R_(3)+R_(4)` Finally, using equation, `(1)/(R_(p))=(1)/(R_(1))+(1)/(R_(2))+(1)/(R_(3))` the net effectiveresistance is GIVEN by `(1)/(R_("total"))=(1)/(R_(S1))+(1)/(R_(S2))` |
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| 3240. |
Can you boil water in a paper cup? Explain. |
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Answer» Solution :Yes we can BOIL water in paper cup due to FOLLOWING reason. (i) Most type of paper burns at about `230^(@)C` (ii) Water can pass at bottom through PORES of paper (iii) Hot water rises up due to hot conventional current and replaces the COLD water. (iv) Water boils at `100^(@)C` Heat of burns warm the water which rises up in cup, by replacing cold water so heat does not heat up the paper. So water boils in cup of paper. |
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| 3241. |
(a) In human male as well as female reproductive systems there is an organ which apart from producing germ-cells, also plays the role of an endocrine gland. Name the organ for each of the reproductive systems. Draw a diagram of female reproductive system and label on it-cervix and vagina. (b) Name the site of fertilization and also the place where fertilized egg gets implanted in female reproductive system. (c) State the advantage of development of embryo in mother's womb. |
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Answer» Solution :(a) ORGAN in MALE REPRODUCTIVE system-Testis, Organ in female reproductive system-Ovary (B) Site of fertilization-Fallopiantube |
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| 3242. |
What is meant by dispersion of light? |
| Answer» Solution :The SPLITTING of LIGHT into its COMPONENT COLOURS is CALLED dispersion of light. | |
| 3243. |
What is the average velocity of the molecules of an ideal gas? |
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Answer» Solution :As the velocity COMPONENTS of MOLECULES of ideal gas all three axis time and time axis are EQUAL in MAGNITUDE so their vector sum will be zero. So every velocity of an ideal gas is zero. |
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| 3244. |
Collect infrrmation about the space missions undertaken by Sunita Williams. |
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Answer» Solution :Space missions undertaken by Sunita Williams : Sunita Williams was sent by NASA to International Space Station (ISS) on December 2006 for Expedition number 14 of Iss . In April 2007 , she was also a part of Expedition number 15. Some of the objectives of these expeditions were: (a) To continue assembling the ISS with the ASSEMBLY spacewalks. (b) Recofigure the cooling system (c) To remove and throw out the water covering improtant parts of the ISS. During these expeditions she performed four spacewalks in minutes outside the space station. In 2012 , she was launced to ISS for Expeditions 32 ,33 . She was the second woman to hold the post of commnader of ISS during expedition 33. One of the experiments performed during Expedition 33 was operating a robot based on THER earth from the space. She also become the TIME . Using different exercise devices om - board of the ISs , she completed the running , biking and swimming part of traithlon in 1 hours 48 minutes and 33 seconds. Sunita is now holding the seventh rank in the LIST of most experienced space - walkers. |
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| 3245. |
Which of the following statements iscorrect? (a) one volt is one joule per ampere. (b) one volt is one joule per coulomb. |
| Answer» SOLUTION :(B) one VOLT is one JOULE PER coulomb. | |
| 3246. |
Translation |
| Answer» SOLUTION :The PROCESS of bringing t-RNA POSSESSING anticodon that is COMPLEMENTARY to the codon on m-RNA for protein synthesis is called translation. | |
| 3247. |
What is alcoholism ? What are its effects? |
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Answer» Solution :Alcoholism is the ADDICTION to have alcohol in the form of different types of liquor.Liquor is produced from alcohol.Alcohol is turn otained by fermentation of different substances. (2 ) Consuming liquor become an addicition for a long-term.Due to alcohol,the efficiency of nervous system and ESPECIALLY the brain is affected (3) Other vital organs such as kidneys and LIVER are adversely affected (4) Lifespan of an alcoholic decreases due to constant DRINKING and malnourishment (5) Especially in adolescent age if alcohol is consumed the brain functioning does not take place properly.The mental ability of memorization and learning becomes slow.There is lack of concentration in studies. (6) The alcoholic person lacks the rational thinking and hence faces with social.mental and familial PROBLEMS along with physical illness |
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| 3248. |
What is meant by rarer and denser medium? |
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Answer» SOLUTION :Rarer medium The medium in which the velocity of sound increases COMPARED the velocity of sound increases compared to other medium is CALLED rarer medium. (WATER is rarer compared to air for sound). Denser medium. The medium in which the velocity of sound decreases compared to other medium is called denser medium. (Air is denser compared to water for sound). |
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| 3249. |
What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utlity? |
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Answer» Solution :ADVANTAGES: (i) SOLAR cooker uses SUN.s energy to heat and cook food. The sun is an inexhaustible and a clean renewable energy SOURCE. (ii) It does not produce smoke or other residues and so the environment does not get polluted. (iii) When food is cooked in a solar cooker, all the nutrients are retained as it cooks food at a very low temperature. Disadvantages : (i) lt does not work without suniight. Hence, on a cloudy day. it becomes useless. (ii) The places where the days are too short or places with cloud covers round the year have limited utility for a solar cooker. (iii) As the drection of the sun changes with respect to theearth, the direction of REFLECTION of the solar cooker has to be changed accordingly. |
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| 3250. |
An element 'X' with atomic number 11 forms a compound with element 'Y' with atomic number 8. The formula of the compound formed is |
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Answer» XY |
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