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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.
| 6201. |
If we weigh a piece of iron and a piece of wood of same size, iron will weigh more. The reson is |
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Answer» denity of iron is LESS than the density of WOOD |
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| 6202. |
(1) State thefactors on whichthe magnitudeof themagnetic field (produced) due to a currentthrough a strainght conductordepend . (2) Draw the pattern of magnetic fieldlines dueto a currentthrough a straightconductor . |
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Answer» Solution :(1) Factors on whichthe MAGNTIDUE of magneticfield produced by acurrent- CARRYING straight conductordepends on : (i) magntidueof currentpassingthrough theconductor . (ii) DISTANCEOF themagneticcompass FROMTHE STRAIGHTCONDUCTOR . (2) 
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| 6203. |
A compound 'X' of sodium is used as an antacid and it decomposes on strong heating.(i) Name the compound 'X' and give its chemical formula.(ii) Write a balanced chemical equation to represent the decomposition of 'X'.(iii) Given one use of compound 'X' besides an antacid. |
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Answer» Solution :(i) The compound X is SODIUM HYDROGENCARBONATE also called as baking soda. (ii) `2NaHCO_(3)OVERSET("Heat")rarr Na_(2)CO_(3)+CO_(2)+H_(2)O` (III) It is used in FIRE extinguishers and for baking. |
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| 6204. |
Kalaivani was watching at a metal pipe, one end of which is connected to a tank at the top of her building and the other end to the tap, which is near the ground level. She was admiring how the water flows from top to the bottom through the pipe. She went and asked her mother, who was an engineer. (i) Also Kalaivani asked her mother that can she able to compare this with any other scientific concepts ? (ii) How would her mother have compared the resistance in a water pipe as well as ina conductor. (iii) Give the expression for resistors connected in series and parallel. |
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Answer» Solution :(i) `*` Kalaivini's MOTHER took a small PVC pipe which has water in it and held ina horizontal position. Water came out drop by drop. `*` When she raised one of the ends of the pipe , the water through the other end came out with the greater speed. `*` She said initially when I holding the pipe in a horizontal position, pressure at the both the ends are same. So water did not come out. `*` The difference in pressure (Pressure difference) between the two ends is zero,But when I raised one of the ends, the top end has high pressure, and the bottom end has low pressure. `*` Due to this pressure difference, water came out with a faster rate. So compare a conductor or a wire to this PVC pipe. `*` The wire is connected to a battery, whose one end has higher potential and the other end has lower potential. Due to this difference in pontential , electrons from negative TERMINAL (lower potential end)flow towards the positive terminal (higher potential end). `*` Here electron flow is COMPARED with the water flow and the electric potential is compared with the pressure. Kalaivini felt very happy, after hearing her mother's genius explanation. (ii) `*` If the water pipe is smooth inside, then there is no change in the speed of flow of water. i.e., zero resistance. `*` But when the pipe has some blocks inside at different points, the water changes its speed of flow at different points, likewise , whenever electrons flow inside the conductor , they may collide with each other, due to which their speed will be resisted (blocked) , which forms as electrical resistance. `*` Her explanation MADE Kalaivini satisfied. (iii)When two resistors of resistance , `R_(1) & R_(2)` are connected in series to a battery source. `R_(s)= R_(1) +R_(2)` When `R_(1)&R_(2)` are connected in parallel, `(1)/(R_(p)) = (1)/(R_(1)) +(1)/(R_(2)) implies (1)/(R_(p)) = (R_(2)+R_(1))/(R_(1)R_(2))` `R_(P) = (R_(1)R_(2))/(R_(1)+R_(2))` |
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| 6205. |
In the above question, the velocity |
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Answer» increases between POINTS O and A |
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| 6206. |
Name the scientist who discovered the magnetic effect of current. |
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Answer» |
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| 6207. |
Explain the principle and working of a biogas plant. |
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Answer» Solution :The waste of living organisms like cow dung, various plant materials like the residue after harvesting of crops, VEGETABLE waste and sewage etc. form biomass. During the decay of biomass, in the absence of oxygen, BIOGAS is produced in the biogas plant. A SLURRY of cow dung and water is made in the mixing tank from where it is fed into the digester. In the digester tank, ANAEROBIC micro-organisms decompose complex molecules of cow dung slurry and produce biogas. |
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| 6208. |
Which are the light-sensitive cells present in the retina of the human eye ? |
| Answer» SOLUTION :RODS and CONES. | |
| 6209. |
Gravity meter is used to measure |
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Answer» weight of BODY |
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| 6210. |
The colour of a star is an indication of its |
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Answer» size |
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| 6211. |
A divergent lens has a focal length of 20 cm. At what distance should an object of height 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away from the lens. Find the size of the image also. Draw a ray diagram to show the formation of image in above situation. |
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Answer» Solution :Here focal length of given divergent (concave) LENS f = - 20 CM, height of the object h = + 4 cm and distance of image from the lens V = 10 cm. As the image formed by a concave lens is always virtual and ERECT, hence as per sign convention v = - 10 cm. As per lens formula `(1)/(v) - (1)/(u) = (1)/(f)`, we have `(1)/(u) = (1)/(v) - (1)/(f)` `therefore""(1)/(u) = (1)/((-10)) - (1)/((-20)) = - (1)/(10) + (1)/(20) = - (1)/(20)` `rArr` u = - 20 cm Thus, the object is placed at a distance 20 cm from the lens. Moreover `m = (h.)/(h) = (v)/(u)` `therefore` Size of image `h. = (v)/(u) xx h = ((-10))/((-20)) xx (+4) = + 2` cm A ray diagram to show the formation of image is given here in figure. 
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| 6212. |
Inertia of the body depends on |
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Answer» WEIGHT of the object |
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| 6213. |
What happens if fallopian tube is blocked? |
| Answer» Solution :If fallopian TUBE is blocked the EGG will not be able to reach the uterus in such CASE fetilization will not take PLACE. | |
| 6214. |
Two circular coils P and Q are kept close to each other, of which coil P carries a current. What will you observe in the galvanometer connected across the coil Q. (a) if current in the coil P is changed ? (b) if both the coils are moved in the same direction with the same speed ? Give reason to justify your answer in each case. |
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Answer» Solution :(a) If current in the coil P is increased, we get MOMENTARY deflection in galvanometer connected ACROSS the coil Q in one direction. However, if current in the coil P is DECREASED, the deflection in galvanometer is in opposite direction. Due to change of current in coil P, the magnetic filed of coil Q also changes and so as induced current is set up in coil Q and the galvanometer shows a deflection. (b) If both the coils P and are MOVED in the same direction with the same speed, the magnetic field of both the coils remain unchanged. Hence no induced current is set up in coil and there is no deflection in the galvanometer. |
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| 6215. |
Answer question numbers 4(a) to 4(d) on the basis of your understanding of the following paragraph and the related studied concepts.Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth's crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator. In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi, Godavari and Mahanadi. Most power stations in India produce Alternating Current (A.C.). Name two countries, other than India, where power plants based on geothermal energy are operational. |
| Answer» Solution :NEW ZEALAND and UNITED STATES of America. | |
| 6216. |
Answer question numbers 4(a) to 4(d) on the basis of your understanding of the following paragraph and the related studied concepts.Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth's crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator. In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi, Godavari and Mahanadi. Most power stations in India produce Alternating Current (A.C.).State an important advantage of using A.C. over D.C. |
| Answer» Solution :A.C. can be TRANSMITTED over long long distances WITHOUT much LOSS during transit. | |
| 6217. |
Answer question numbers 4(a) to 4(d) on the basis of your understanding of the following paragraph and the related studied concepts.Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth's crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator. In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi, Godavari and Mahanadi. Most power stations in India produce Alternating Current (A.C.).Name the phenomenon that explains the working of an electric generator. |
| Answer» SOLUTION :ELECTROMAGNETIC INDUCTION. | |
| 6218. |
Answer question numbers 4(a) to 4(d) on the basis of your understanding of the following paragraph and the related studied concepts.Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth's crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator. In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi, Godavari and Mahanadi. Most power stations in India produce Alternating Current (A.C.).What are geothermal energy hot-spots ? |
| Answer» Solution :Hot-spots CONSIST of MOLTEN ROCKS trapped in certain regions of earth.s CRUST. | |
| 6219. |
What is the far point and naar pointof human eye with normal vision ? |
| Answer» Solution :THEABILITY of the eye lens to adjust its focal length is CALLED accommodation . The minimum DISTANCE upto which a normal eye cansee clearly is called. near point. For normal eye. near point is about 25 cm. The MAXIMUM distance upto which the eye can see clearly is called FAR point . The distance between near point and far point is also called accommodation. | |
| 6220. |
The rotating or turning effect of a force about a fixed point or fixed axis is called …………………. |
| Answer» SOLUTION :torque | |
| 6221. |
Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise . Apply the right-hand rule to find out the direction of the magnetic fieldinside and outside the loop. |
Answer» Solution :Let the LOOP by place on the table with current flowing in the clockwise direction as shown in the figure . By applying the right-hand thumb RULE to the LEFT side [and right side] of the loop, we find that magnetic field lines inside the loop are going out of the table, while OUTSIDE the loop they are COMING into the table, Thus, the magnetic field is directed outwards inside the loop and inwards outsidethe loop .
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| 6222. |
Stars twinkle due to |
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Answer» Solution :(i) Stars are self luminous and can be seen at night in the absence of sunlight. (ii) They APPEAR to be point sources as they are at a very LARGE distance from us. (iii) The apparent position of the star keeps changing a bit because of the motion of ATMOSPHERIC air and changing air density and temperature. (iv) Becauseof this, refractive index of air keeps changing continuously. (v) So the position and BRIGHTNESS of the stars keeps changing and so the stars appear to be twinkling. |
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| 6223. |
Explain how does burning of fossil fuels causes air and soil pollution |
| Answer» SOLUTION :BURNING of fuels releases gases LIKE `CO_(2) , SO_(2), NO_(2)`. These cause air pollution. Ith rain, these pollutants FALL as acid rain and cause soil pollution. | |
| 6224. |
How fast should a man weighing 600 N run so that his kinetic energy is 750 J ?( g=10 m s^(-2)) |
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Answer» Solution :Given :W=600 N ,g =10 m `s^(-2)`, KINETIC energy =750 J,v=? Since W=MG `therefore600=mxx10` or m =60 mg Kinetic energy =`(1)/(2)mv^(2)` `750=(1)/(2)xx60xxv^(2)` `therefore v^(2)=(2xx750)/(60)XXV^(2)` `therefore v^(2)=(2xx750)/(60)=25` or `v=sqrt(25)=5ms^(-1)` |
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| 6225. |
Observe the diagram given and answer the question asked. c. Name the type of lens used to correct this defect. |
| Answer» SOLUTION :CONCAVE LENS is USED to correct this defect. | |
| 6226. |
Which of the following sources of energy cannot be used as a source of energy on a cloudy day ? |
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Answer» GEOTHERMAL ENERGY |
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| 6227. |
What is Lateral shift? Explain with a diagram |
Answer» Solution :When a RAY of light travels through a glass slab from air, it bends towards the normal and when it . comes out of the other SIDE of the glass slab, it bends away from the nonnal. It is found that the incident ray and the emergent ray are not along the satne straight -line, but the emergent ray SEEMS to be displaced with respect to the incident ray. This SHIFT in the emergent ray with respect to the incident ray is called lateral shift or lateral displacement. The incident and the emergent rays, however, remain parallel. The diagrain is as shown: 
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| 6228. |
__________ is used to fix the magnitude of current through a circuit. |
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Answer» |
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| 6229. |
What are ionic compounds? Mention any two properties of ionic compounds. |
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Answer» Solution :The compounds which have BONDS FORMED by loss and gain of electrons are called ionic compounds or electrovalent compounds. Two PROPERTIES of Ionic compounds i) Ionic compounds are hard and brittle. II) Tonic compounds have high melting and boiling POINTS. |
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| 6230. |
Steam engine cannot be started instantaneously because, |
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Answer» the efficiency of the engine is low |
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| 6231. |
A compass needleis placed near a current - carryingstraight wire . Stateyourobservation when the currentin the wire is increased . Givereason . |
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Answer» SOLUTION :Thedeflectionof the COMPASS needleincreases . REASON : Magneticfieldstrenghtproduced NEAR a CURRENT - carryingstraightwireis directlyproportional to the current . |
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| 6232. |
(a) Why are solar heating devices painted black ? (b) Name two such devices and state two limitations of these. |
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Answer» SOLUTION :(a) Black bodies are good absorbers of heat, so temperature rises quickly. (b) TWO devices-Solar COOKER, Solar water heater. Two limitations : (i) Cannot be used at night. (ii) HEATING PROCESS is very slow. |
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| 6233. |
What is mirage? With a neat labelled diagram , explain the conditions underwhich it is seen. |
Answer» Solution :Due to the changes in refraction of light, the light RAYS coming from a distant object appear to be coming from the image of the object inside the ground. This is called a mirage. When the earth's surfaceis heated by the sun, the temperature of air increases. This produces a layer of hot air of lower density ( mass per unit VOLUME) and lower refractive index at the surface. Hot air works as an optically rarer medium relative to cool air. Whenthe temperature changes rapidly in the vertical direction , as refraction of light takesplace, the angle of refraction changes CONTINUOUSLY. The rays of light from the top of an object such as a car or tree cross the rays from the bottom of the object on their way to the observer's eye. Hence, an inverted image is formed below the object's true position and downward towards the surface in the direction of air at higher temperature.In this case, some rays of light bend back up into the denser air above. Mirage produces an IMPRESSION of water near the hot ground. |
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| 6234. |
A thermodynamic system is taken from an original state to an intermediate state by the linear process shown in Fig.Its volume is then reduced to the original value from E to F by an isobaric process. Calculate the total work done by the gas from D to E to F. |
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Answer» SOLUTION :TOTAL WORK done by the gas from D to E to F. `W=W_(DE)+W_(EF)` = Area of trapezium DEGHD – Area of rectangle EFHG = Area of triangle DEF `=1/2DE xx FE` `=1/2(600-300) Nm^(-2) xx(5.0-2.0)m^3` = 450 J. |
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| 6235. |
Deduce the equation of a force usingNewton's second law of motion . |
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Answer» Solution :"The force acting on a body is directly proportional to the rate of CHANGE of linear momentum of the body and the change in momentum takes place in the direction of the force". Let, m. be the mass of a moving body, moving along a straight line with an initial SPEED .. After a time interval of the velocity of the body changes to .y. due to the impact of an unbalanced EXTERNAL force F. Initial momentum of the body `P_(i) = m u` Final momentum of the body `P_(f) =m u` Change in momentum `Deltap-P_(f) -P_(i)` `=mv-m u` By Newton.s second law of motion, Force`prop` Forate of change of momentum F`prop` change in momentum/time `F prop(“mv-mu”)/(t)` `F=(km(v-u))/(t)` Here, k is the proportionality constant. k-1 in all systems of units. Hence, ` F= (m(v-u))/(t)` Since, acceleration change in velocity/time, a =(v - u)/t. Hence, we have `F=mxxa` Force - mass`xx` acceleration (i) No external force is required to maintain the motion of a body moving with uniform velocity. (ii) When the net force acting on a body is not equal to zero, then definitely the velocity of the body will change. (iii) Thus, change in momentum takes place in the direction of the force. The change may take place either in MAGNITUDE or in direction or in both. |
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| 6236. |
The current carriers can have |
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Answer» POSITIVE CHARGE only |
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| 6237. |
What is a lens? State any two application of lenses. |
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Answer» SOLUTION :1.A lens is a transparent MEDIUM bound by two surfaces. 2. LENSES are used in SPECTACLES and telescope. |
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| 6238. |
The magenetic field inside a long straight solenoid carrying current. |
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Answer» Is ZERO |
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| 6239. |
A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 12 cm. The distance of the object from the lens is 18 cm. Find the nature, position and size of the image. |
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Answer» SOLUTION :As per question f = + 12 cm, u = - 18 cm and h = + 10 cm As per lens formula `(1)/(v) - (1)/(u) = (1)/(f)`, we have `(1)/(v) = (1)/(u) + (1)/(f) = (1)/((-18)) + (1)/((+12)) = (1)/(36) rArr v = + 36` cm The image is formed on opposite side of lens at a distance of 36 cm from it. The image is a real and inverted image. MOREOVER, magnification `m = (h.)/(h) = (v)/(u)` `rArr` Size of image `h. = (v)/(u) xx h = ((+36))/((-18)) xx (+10) = - 20` cm So, the size of image is 20 cm tall and is formed below the principal axis. |
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| 6240. |
The three metals in the third period of the modern periodic table. |
| Answer» Solution :(i) Sodium(II) MAGNESIUM(III) Aluminium | |
| 6241. |
Draw the ray diagram in each of the following cases to show the position and nature of the image formed when the object is placed : (a) at the centre of curvature of a concave mirror. (b) between the pole P and focus F of a concave mirror. (c) between the pole P and infinity of a convex mirror. (d) at 2F of a convex lens. (e) at infinity in front of concave lens. |
Answer» SOLUTION :
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| 6242. |
A shining metal 'M', on burning gives a dazzling white flame and changes to a white powder 'N'. Identify 'M' and 'N'. |
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Answer» Solution :M = MAGNESIUM, MG N = Magnesium oxide, MgO |
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| 6243. |
Meena who is studying in Class-X gets tired very soon and her skin colour is turning pale, her haemoglobin content in the blood is also low. She is really confused about this situation. She goes to the doctor and he gives her a diet plan along with some medicines. Answer the following questions based on the above information: (i) Which disease is she suffering from? (ii) What kind of diet should she take to overcome this problem? (iii) What values were neglected by Meena that resulted in the present condition? |
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Answer» Solution :(i) MEENA is suffering from ANAEMIA. (ii) She should take fruits and vegetables (spinach) which is rich in IRON. Iron is an essential component of haemoglobin and is required for its proper FUNCTIONING. (iii) Respect for health, taking CARE of diet. |
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| 6244. |
When an object is placed infront of a spherical mirror at a distance 30 cm, the magnification is -1. If the object is placed at 10 cm. What changes occur-to the properties of the image? |
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| 6246. |
Activity: Take a small slab of ice, a think wire and two identical weights. |
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Answer» Solution : Observation: The wire GRADUALLY penetrates the ICE SLAB and COMES out of lower surface of the slab after some time without BREAKING the slab. |
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| 6247. |
How many major thermal power stations are operative in Maharashtra? |
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Answer» 10 |
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| 6248. |
If a trolley starts from rest with an accerelaton of 2m/s^(2), the velocity of the body after 4 s would be |
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Answer» 2m/s |
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| 6249. |
The fuel which is not obtained from biomass is : |
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Answer» FIREWOOD |
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| 6250. |
Out of kilowatt hour and electron volt, which is bigger unit of energy and by what factor? |
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Answer» SOLUTION :KWH is a BIGGER UNIT of ENERGY. |
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