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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.
| 2301. |
Define the term dispersion of white light, State the colour which bends (i) The least and. (ii) The more while passing through a glass prism |
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Answer» Solution :The spilitting up of WHITE light into its components COLOURS is CALLED dispersion. The COLOUR which bends (i)The LEAST is red, and (ii) The most is violet, while passingthrough a glass prism |
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| 2302. |
The biggest source of energy of Earth's surface is |
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Answer» Biomass |
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| 2303. |
A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore proper vision ? |
| Answer» SOLUTION :A person suffering from MYOPIA should use a concave lens of SUITABLE FOCAL LENGTH. | |
| 2304. |
Disadvantages of hydroelectric power plant: |
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Answer» Solution :Disadvantages of hyroelectric power PLANT : (i) Village towns forests may submerge due to B back-water causedby storage of water in DAMS. This leads to forced MIGRATION of the living population in that area. (ii) The obstruction of the flow of river water may have adverse effect on the living WORLD in the river. |
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| 2305. |
Assertion (A) : Distance of real image formed by a mirror is taken to be negative but for a lens we take it with positive sign. Reason (R) : A mirror forms real image of an object in front of it but real image formed by a lens lies on other side of lens. |
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Answer» Both (A) and (R) are true and (R) is correct explanation of the assertion. |
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| 2306. |
A water pond appears to be 2*7m dep. If the refractive index of water is 4//3, find the actual depth of the pond. |
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| 2307. |
In thenucleusof ""_(20)Ca ^(40), thereare ______. |
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Answer» 20 PROTONS and 40 NEUTRONS |
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| 2308. |
Explain with a diagram : Kepler's three laws. Hence show that gravitational force, F prop (1)/(r^(2)) (in the usual notation). |
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Answer» Solution :Kepler's FIRST law : The orbit of a planet is an ellipse with the Sun at one of the foci.  Figure 1.5 shows the elliptical orbit of a planet revolving around the Sun (S). Kepler's second law : The line joining the planet and the Sun sweeps equal areas in equal intervals of time. `A rarr B, C rarr D and E rarr F` are the displacements of the planet in equal intrvals of time. The STRAIGHT lines AS, CS and ES sweep equal areas in equal areas in equal intervals of time. Area ASB = area CDS = area ESF. Kepler's third law : The square of hte period of revolution of a planet around the Sun is directly proportional to the cube of the mean distance of the planet from the Sun. Thun, if r is the average distance of the planet from the Sun and T is its period of revoltuion, then, `T^(2) prop r^(3),"i.e., "(T^(2))/(r^(3))="constant = K"` For simplicity we shell assume the orbit to be a circle. In Fig. 1.6, S denotes the position to the Sun, P denotes the position the position of a planet at a given instant and r denotes the radius of the orbit (`-=` the distance of the planet from the Sun). Here the speed of the planet is uniform. It is  `v=("circumference of the circle")/("period of revoltuion of the planet")` `=(2pir)/(T).` If m is the mass of the planet, the centripetal force exerted on the planet by the Sun (`-=` gravitational force), `F=(mv^(2))/(r)` `therefore F=(m(2pir//T)^(2))/(r)=(4pi^(2)mr^(3))/(T^(2)r)=(4pi^(2)mr)/(T^(2))` ACCORDING to Kepler's third law, `T^(2)=Kr^(3)` `therefore F=(4pi^(2)mr)/(Kr^(3))=(4pi^(2)m)/(K)((1)/(r^(2)))` Thus, `F prop (1)/(r^(2))` as `(4pi^(2)m)/(K)` is constant in a particular CASE. |
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| 2309. |
In a single fixed pulley, if the effort moves by a distance x downwards, by what height is the load raised upwards ? |
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| 2310. |
(i) What is Hydrated salt? (ii) How is ethanoic acid prepared from ethanol? Give the chemical equation? |
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Answer» Solution :(i) `*` When ionic substances are DISSOLVED in water to make their saturated aqueous solution, their ions attract water molecules and attached chemically in certain RATIO. This process is called hydration. `*` The number of water molecules found in the crystalline substance is called water of CRYSTALLIZATION. `*` Such salts are called hydrated salts. `*` Eg. Blue VITRIOL `-CuSO_(4).5H_(2)O` (ii) Ethanoic acid is prepared by the oxidation of ethanol in the presence of ALKALINE potassium permanganate or acidifiedpotassium dichromate. `""underset("Ethanol")(CH_(3)CH_(2)OH)underset(2[O])overset(KMnO_(4)|OH^(-))(rarr)underset(("Ethanoic acid"))(CH_(3)COOH+H_(2)O)` |
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| 2311. |
In a house 5 lamps of 60w used in 3 hours and 6 lamps of 40 w are used in 5 hours daily. Which is the device used to measure the used electric current? |
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| 2312. |
Draw neat and labelled diagrams. Schematic for thermal power plant |
Answer» SOLUTION :
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| 2313. |
Give three examples of hobbies to reduce stress. |
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Answer» Solution :Some of the ways to reduce stress are as follows: i. Maintaining good COMMUNICATION and expressing our feelings to friends, peers, cousins, techers and parents or noting them down in a diary. ii. Utilizing the free hours in fostering hobbies like matrial collection,photography, reading, cooking, suclputing, drawing, making RANGOLI, dancing, singing, listening to music, etc. iii. Diverting energy and mind towards positive thinking, so as to neutralize the negative thoughts. Regular exercising, getting a massage, practicing yoga and meditation. iv. Laughing LOUDLY so as to relive stress. v. Playing sports and outdoor games so as to involve physical exercise, inculcate discipline, increase interaction with others, drive AWAY loneliness, etc. VI. Inculacting traits like time management, planning of our own duties and taking own decisions. vii. If any of the above methods fail to reduce stress and leads to more serious problems like depression and frustration, then medical help, counselling and /or psychotherapy should be taken. |
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| 2314. |
Mock drill is useful. |
| Answer» Solution :(1) Mock drill is the practice to check whether there is preparedness for dealing with the disaster if suddenly it attacks. (2) For this purpose, virtual or apparent situations that simulate THEDISASTER are created. The reaction TIME for anytype of disaster is checked by suchactivity. (3) In the presence of TRAINED PERSONNEL, the EXECUTION of the rescue plans areobserved. (4) People also understand their responsibilities at the time of actual disaster. The experts also check execution ofplan designed for disaster redressal. (5) By such mock drills, the efficacy of the system can be understood. (6) In future, when actual calamity strikes, there is already preparation for disaster redressal. Therefore, mock drill is useful. | |
| 2315. |
Which uses more energy, a 250 W TV set in 1 hr or a 1200W toaster in 10 minutes ? |
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Answer» Solution :For TV set `E= Pxxt=0.25xx1=0.25` kwh For toaster `E= 1.2 xx(1)/(6) = 0.2 ` kwh :.` TV set CONSUMES more ENERGY than a toaster. |
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| 2316. |
(a) What is atmospheric refraction ? What causes atmospheric refraction ? (b) Why do stars twinkle on a clear night ? (c) Explain why, the planets do not twinkle at night. |
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| 2317. |
What do you understand by nonorenewable resources ? |
| Answer» SOLUTION :Non-renewable resources. The non-renewable NATURAL resources are in the FORM of fossil fuel and metallic minerals. They are PRESENT in the earth.s crust in an uneven distribution throughout the wprid. Some COUNTRIES have rich resources while other countries are short of such resources The reasonof uneven distribution is not known. | |
| 2318. |
Based on the given diagram answer the questions given below : Name the hormone secreted by testis and mention its role. |
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Answer» Solution :HORMONE Testosterone :Function : (i) Responsible for FORMATION of MALE gametes. (II) Responsible for development of secondary SEXUAL characters in males. |
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| 2319. |
(a) Define absolute refractive index of a medium. (b) Light enters from air into water which has a refractive index of 1.33 (or (4)/(3)). Calculate the speed of light in water. The speed of light in air is 3.0 xx 10^(8) m//s. |
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Answer» SOLUTION :(a) N/A (b) It is given that speed of light in air `c = 3.0 xx 10^(8) m//s` and refractive INDEX of water `n_(W) = 1.33` `therefore` Speed of light in water `v_(w) = (c)/(n_(w)) = (3.0 xx 10^(8))/(1.33) = 2.25 xx 10^(8) m//s` |
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| 2320. |
Name the body part with which the term myopia and hypermetropia are connected. |
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| 2321. |
Explain in brief the sensitive issues of general public about disaster. |
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Answer» Solution :The phase of emergency, TRANSITIONAL phase and reconstruction phase are the three phases of disaster that are IMPORTANT for common citizens. (1) Phase of emergency: If timely and rapid action is taken during this phase, maximum lives can be saved. Search and rescue operations, medical help, first ai.d, restoring communication services, REMOVING the people from. affected area are done during this phase. The gravity of disaster can be estimated during this phase. (2) Transitional Phase: The disaster subsides and then the work of transitional phase starts. The main concern is rehabilitation work for the affected and displaced people. This work includes clearing of debris, resto~ing water supply, repairing roads, etc. to bring normalcy in public life. Help from different voluntary and Government institute is taken to offer the monetary provision and essential commodities to affected victims. Permanent means of LIVELIHOOD is given to the people to reduce their mental and emotional stress. The victims are truly rehabilitated. (3) Reconstruction Phase : Reconstruction phase is a highly complicated phase which actually overlaps with transition stage. Help is offered to people to reconstruct their buildings. Other facilities like roads and water supply are restored. Farming practices are restarted. It is a very gradual phase that makes the victims to completely rehabilitate. |
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| 2322. |
Which of the following instruments does not have plus (+) or minus (-) sign marked on it while representing in a circuit diagram ? |
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Answer» Rheostat |
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| 2323. |
When an electric charge is moving in free space |
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Answer» only MAGNETIC FIELD is produced |
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| 2324. |
Complete the analogy :Force:Vector::Weight:_____________ |
| Answer» Solution :Vector-Weight is also a FORCE and its DIRECTION is TOWARDS the CENTRE of the earth. Weight `=mxxg` | |
| 2325. |
Light travels with a velocity 1.5xx10^(8) m/sin a medium. On entering secon medium its velocity becomes 0.75xx10^(8) m/s. What is the refractive index of the second medium with respect to the first medium ? |
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Answer» SOLUTION :Given : `v_(1) =1.5xx10^(8)` m/s `v_(2)=0.75xx10^(8)` m/s To find : `""_(2)n_(1)` Solution : `""_(2)n_(1)=(1.5xx10^(8))/(0.75xx10^(8))=2` The refractive index of the second MEDIUM with respect to thefirst medium is 2 |
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| 2326. |
Complete the table with reference to given disasters: |
Answer» SOLUTION :MOTER accident, LANDSLIDING FOREST FIRE.  
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| 2327. |
While performing the experiment on the determination of focal length of a convex lens, four students obtained the image of the same distant tree on the screen : Which diagram shows the formation of image correctly ? |
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| 2328. |
Assertion : Moderator is used to slow down the high energy neutrons to provide slow neutrons. Reason :Cadmium rods are used as control rods |
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Answer» If both the ASSERTION and the REASON are true and the reason is the correct explanation of the assertion. |
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| 2329. |
State any two used of an AC generator. |
| Answer» Solution :An ALTERNATING current is USED in an electric HEATER and a refrigerator . | |
| 2330. |
Explain ocean-thermal energy and how can it be harnessed. Mention any two limitations in obtaining the energy from the oceans ? |
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Answer» Solution :The difference in temperature between warm surface water heated by the SUN and colder water found at ocean depth is a source of energy called Ocean thermal energy. The difference in temperature is exploited in OTE CONVERSION plants. The warm surface water is used to BOIL a VOLATILE liquid like ammonia. The vapours are used to run the turbine of a generator. Limitations : (i) Efficient commercial exploitation is DIFFICULT. (ii) Expensive set up. |
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| 2331. |
Various essential elements like N, P, K bocome available to the crops due to earthworms and fungi. |
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| 2332. |
Draw field lines around a current ,carrying loop. What happens to the magnetic field lines due to a cunent carrying straight conductor when the current is revened ? State the rule which gives relation between magnetic field lines and direction ofcunenl |
| Answer» SOLUTION : Direction of magnetic field LINES will change the direction when current is reversed. Direction of magnetic field can be easily found by APPLYING the .Right HAND Thumb Rule.. ACCORDING lo this rule, hold the current carrying conductor in your right hand such that thumb is stretched along the direction of current. Then fingers will wrap around the wire in the direction of magnetic field.4 | |
| 2333. |
The reactor in which no moderator used is |
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Answer» FAST BREEDER REACTOR |
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| 2334. |
Sartaj, a Class-X student, is a resident of Srinagar. He sees tourists roaming around throughout the year. He likes to see new people in his native place but one thing disturl1s him. They throw plastic covers, bottles and other litter here and there. He picks up the waste and throws it in the dustbins whenever he can. On the basis of the above information answer the following questions. (i) As a responsible citizen of the country what two precautions you would take while visiting tourist place. (ii) What values are promoted by Sartaj? |
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Answer» Solution :(i) (a) While visiting to TOURIST places we should not throw GARBAGE and waste materials. (b) We should not try to TEMPER with the natural beauty of that PLACE. (ii) Environmental protection, cleanliness. |
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| 2335. |
How does the refractive index of a medium depend on the wavelength of light used ? |
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| 2336. |
A uniform wire of resistance 50Omega is cut into five equal parts. These parts are now connected in parallel in parallel. Then equivalent resistance of the combinationis |
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Answer» `2OMEGA` |
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| 2338. |
calculate the number of moles present in 9 g of ethane. |
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Answer» Solution :In leech, LOCOMOTION takes place by: (a) Looping or CRAWLING movement: This type of movement is brought about hy the contraction and relaxation of muscles. The two suckers serve for ATTACHMENT during movement on a SUBSTRATUM. (b) SWIMMING movement: Leeches swim very actively and perform undulating movements in water. |
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| 2339. |
………. is used to diagnose anaemia and also to provide treatment for the same |
| Answer» SOLUTION :RADIO - IRON `(FE^(59))` | |
| 2340. |
From incident white light how will you obtain whit emergent light by making use of two prisms ? |
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Answer» Solution :1. We can RECOMBINE the components of white light dispersed by one prism by placing a second IDENTICAL prism PARALLELTO the first prism in an upside down position. 2. When the colours of the spectrum from the first prism fall on the SECON prism,theyrecombine to produce white light. 
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| 2341. |
In alpha-decay atomic number of daughter nucleus is increased by one. |
| Answer» Solution :In beta-decay atomic number of DAUGHTER NUCLEUS is INCREASED by one. | |
| 2342. |
The resistivity of manganese wire of length 1 m is 1.84xx10^-6Omegam" at "20^(@)C. If the diameter of the wire is 3xx10^-4m, what will be the resistance of the wire at that temperature? |
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Answer» Solution :Given, Resistivity `rho=1.84xx10^(-6)Omegam` Length l = 1M, Diameter d = `3XX10^(-4)m` Area of cross section `A=(pid^(2))/4=22/7xx(3xx10^(-4)xx3xx10^(-4))/4=99/14xx10^(-8)m^(2)`. RESISTANCE `R=(rhoxxl)/A=(1.84xx1xx14xx10^(-6))/(99xx10^(-8))` = `(25.76xx10^(2))/99=26.02Omega` |
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| 2343. |
Air is not visible because it |
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Answer» is nearly a perfectly TRANSPARENT substance |
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| 2344. |
State newton's third law |
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Answer» Solution :(i) .For EVERY action, there is an equal and opposite reaction. They always ACT on two DIFFERENT BODIES.. (ii) Example : When you fire a bullet, the gun recoils backward and the bullet is moving FORWARD (Action) and the gun equalises this forward action by moving backward (Reaction). |
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| 2346. |
In a Carnot engine when T_(2) = 0^(@)C and T_(1) = 200^(@)C its efficiency is eta_(1) and when T_(1) = 0^(@)C and T_(2) = -200^(@)C. Its efficiency is eta_(2), then what is eta_(1)//eta_(2)? |
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Answer» `1.00` `eta_2 =1 - (-200+273)/(0+273) =200/273` HENCE `eta_2//eta_1 = 0.577` |
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| 2347. |
Resistor : fix the magnitude or current : ______________ : select the magnitude of current. |
| Answer» SOLUTION :RHEOSTAT | |
| 2348. |
A bulb is marked 220 V and 40 W. Calculate the current flowing through the bulb and its resistance. |
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Answer» <P> Solution :GIVEN : Voltage = V = 220 V, Power = P = 40 W.`P=VIrArrI=P/V=40/220=0.182A` RESISTANCE = `R=V/I=220/0.182=1210Omega` |
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| 2349. |
(i) Describe the various steps involved in the process of binary fission with the help of a diagram.(ii) Why do multicellular organisms use complex way of reproduction ? |
Answer» Solution :(i) (ii) Multicellular organisms are made of collection of CELLS, which have differentiated to FORM various tissues. Hence, there are different types of specialised cells. Rather than each different CELL undergoing cell division for reproduction, these organisms have special STRUCTURES / cells to UNDERGO or help in reproduction. This ensures continuity of species. |
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| 2350. |
An electric bulb is rated 220V and 100W. When it is operated on 110V, the power consumed will be: |
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Answer» 100W `THEREFORE` Resistance of bulb filament `R=V^2/P=(220 times 220)/100=484 Omega` When the bulb is operated at a voltage V.=110 V, the POWER consumed is `P=V^2/R=(110 times 110)/484=25W.]` |
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