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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.
| 4201. |
(i)A manis standing between two vertical wall 680 m apart. He claps his hands and hears two distinct echoes after 0.9 secondsand 1.1 seconds respectively .What is the speed of sound in the air ? (ii) An electric heater of resistance 5Omega is connected to an electric source .If a current of 6 A flows through the heater then find the amount of heat produced in 5 minutes. |
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Answer» Solution :`Velocity =("Distance travelled by sound")/("Time taken")` `v=(2d)/(t)` `d_1=(vt_1)/(2)& d_2=(vt_2)/(2)` `d_2=(v)/(2)(t_1+t_2)` `v=(2d)/((t_1+t_2))` `=(2xx680)/((0.9+1.1))` (ii) GIVEN resistance R=5 `Omega`,current I=6A Time t=5 minutes =`5xx60s` =300s AMOUNT of HEAT produced, H=`I^(2)Rt` `H=6^(2)xx5xx300`. Hence H=5400J |
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| 4202. |
Name the part of the eye (i) that controls the amount of light entering into the eye. (ii) that had real, inverted image of the object formed on it. |
| Answer» SOLUTION :(i) PUPIL, (II) RETINA. | |
| 4203. |
Translocation |
| Answer» Solution :The process of movement of the RIBOSOME from one end of m-RNA to other end by the distance of one TRIPLET CODON is called translocation. | |
| 4204. |
(a) Write the name and symbol of group 17 element belonging to second period. (b) Write electronic configuration of K(19) . To which group of periodic table does it belongs ? (c) What are substitution reactions ? Give one example (d) What happens when acetic acid reacts with sodium bicarbonate ? Give the chemical reaction involved. (e) Why does carbon from covalent bonds ? |
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Answer» SOLUTION :(a) F (b) K(19) =2,8,8,1`rArr 1^(st)` group (C) `CH_(4)+Cl_(2) overset("Sunlight")to CH_(3)CL +HCl` (d) CH_(3)COOH +NaHCO_(3) to CH_(3)COONa+H_(2)O +CO_(2)` (e) Carbon contains four ELECTRONS in its outermost shell |
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| 4205. |
State true or false and give reasons for your ansRelative humidity has no unit. |
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| 4206. |
20 cm high object is placed at a distance of 25 cm from a converging lens of focal length of 10 cm . Determine the position , size and type of the image . |
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Answer» Solution :Date: Converging lens, F= 10 , u =-25 cm `h_1 =5 cm`v=? `h_2 = ? ` (i) `1/f = 1/v-1/u :. 1/ v= 1/f + 1/u` `:. 1/v = 1/(10 cm) + 1/(-25 cm ) = 1/(10 cm )-1/(25 cm ) ` `= (5-2)/( 50 cm ) =3/(50 cm ) ` `:.` Image DISTANCE ,` v = 50 / 3 cm ` ` div 16.67 cm div 16.7 cm `This gives the position of the image. (ii) ` h_2 /h_1 = v/ u:. h_2 = v/u h_1 ` ` THEREFORE h_2 =((50/3) cm )/(-25 CM ) xx 20 cm =- ( 50 xx 20)/(25 xx 3) cm` `=- 40/3 cm div - 13.333 cm ` ` div - 13.3 ` cm The height of the image =- 13.3 cm ( inverted image ) ` ` therefore ` minus sign . (III)The image is real , invreted and smaller than the OBJECT . |
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| 4207. |
Which of the following bulbs has more resistance? (a) A 220V, 100W bulb (b) a 220 V, 60 W bulb. |
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Answer» SOLUTION :60 W bulb Here, `R PROP 1/P` ( `:.` as both the bulbs have the same VOLTAGE rating.) |
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| 4208. |
Complete and balance the following chemical equations :(i) Al_2O_3 + Hclrarr(ii) K_2O+H_2Orarr (iii) Fe+H_2Orarr(b) An element 'X' displaces iron from the aqueous solution of iron sulphate. List v observations if the element 'X' is treated with the aqueous solutions of copper sulphate, zinc sulphate and silver nitrate. Based on the observations arrange X, Zn, Cu and Ag in increasing order of their reactivities. |
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Answer» Solution : (i) `Al_2O_3 + 6HCl rarr 2AlCl_3 + 3H_2O` (ii) `K_2O +H_2O rarr 2KOH` (iii) `2Fe+3H_2O rarr Fe_2O_3 + 3H_2` (b) As the element displaces iron from the solution of iron SULPHATE, X is higher than Fe in the reactivity SERIES. (i) When X is treated with aqueous solution of copper sulphate copper is displaced from the solution and blue colour of `CuSO_4` will disappear `X + CuSO_4 rarrXSO_4 + underset("Brown")(Cu) uarr` (ii) When X is treated with aqueous solution of zinc sulphate then Zn will be displaced if X LIES higher than Zn in the activity series (K, Na, Ca, Mg, Al). If X is Zn, then nothing will happen. (iii) If X is treated with aqueous solution of silver nitrate, then silver will be displaced and `X(NO_3)_2` will be formed. `X + 2AgNO_3 rarr X(NO_3)_2 + underset("Silvery")(2Ag) uarr` The metals can be arranged in increasing order of reactivity as under : `Ag lt Cu lt Zn LE X` |
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| 4209. |
Why are the control rods made of cadmium? |
| Answer» SOLUTION :CADMIUM has HIGH cross-section for the ABSORPTION of NEUTRONS, | |
| 4210. |
Golden rice is |
| Answer» Solution :Biotechnologically developed VARIETY of rice in which gene SYNTHESIZING the vitamin A (Beta carotene) has been INCORPORATED and which contains 23 times more amount of beta varotene than that of the normal variety is called GOLDEN rice. It was developed in 2005. | |
| 4211. |
Calculate the amount of heat generated while transferring 90000 coulombs of charge between the two terminals of a battery of 40V in one hour. Also determine the power expended in the process. |
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Answer» Solution :Here charge transferred Q=90000C, potential DIFFERENCE between the terminals of battery V=40V and time t=1 h =3600s. `THEREFORE` CURRENT `I=Q/t=90000/3600=2A` , `therefore ` Amount of heat generated `H=Vlt=40 TIMES 25 times 3600=3600000J=3.6 times 10^6 J` and POWER expended `P=H/t=VI=40 times 25=1000W` |
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| 4212. |
Name the substances used to make a conducting wire, resistive wire and resistor. |
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Answer» Solution :A conducting wire is made from metals like copper or ALUMINIUM A RESISTIVE wire is made from alloys like Nichrome. Carbon resistors are made from the proper mixture of graphite and RESIN (POLYMER) e.g., sealing-wax, cotton, etc. |
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| 4213. |
Find out the more about the activities of international organizations that work for disaster management. i. United nations Disaster Relief Orgaization. ii. United Nations Centre for Human Settlements iii. Asian Disaster Reduction Centre iv. Asian Disaster Preparedness Centre v. World Health Organization vi. United Nations Educational, Scientific and Cultural organization. |
Answer» SOLUTION : 
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| 4214. |
What will happen when the leaf of a sensitive plant is touched ? |
| Answer» Solution :Its leaves would GET folded DUE to their MASTIC MOVEMENT. | |
| 4215. |
Three students (A), (B) and (C) connect their two given resistors R_(1) and R_(2) in the manners shown below : They connect the terminals marked X and Y above to the terminals marked X and Y in the circuit given below: The record the Ammeter readings (I) for different positions of the rheostat and the corresponding Voltmeter readings (V). The average value of the ratio V/I in their observations would be minimum for : |
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Answer» STUDENTS (A) and (B) only |
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| 4216. |
Mention any two limitations of using fossil fuels. |
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Answer» Solution :(i) Fossil FUELS will RUN out or will not be REPLENISHED. (II) They are non-renewable sources of ENERGY. |
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| 4217. |
What will you do if you are spending more time in internet /mobile games, phone, etc. ? Why ? |
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Answer» Solution :If I start spencing more TIME on incternet/mobile GAMES, phone, etc. I would follow the below given steps: i. Designating activities during which the usage of iinternet or mobile phones should be strictly avoided. For example during metals, while studying, etc. ii. Talking to family members or friends when I feel lonely instead of using internet or mobile phones. This will redue the habit of using mobile phones during idle time. iii. Develop hobbies like rading books, writing diary, COLLECTING various meterials, drawing, SINGING, listening to MUSIC, etc. For reasons why we should avoid spending more time internet /mobile games phone etc.: |
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| 4218. |
Girls are not facing the problem of stress due to gender inequality. |
| Answer» SOLUTION :False-Mosly girls are FACING gender inequality which is INCREASING their STRESS LEVEL. | |
| 4219. |
There is no change in the colour of red litmus and blue lit mus paper when introduced into an aqucous solution of sodium chloride. A fter passing direct current through the same solution, red litmus ehanges to blue colour. Which product is responsible for this change? Mention any two uses of this produet. |
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Answer» SOLUTION :`Sodium hydroxide // NaOli.` (i) Degreasing netals (ii) soaps and detergents (III) Paper NMAKING (IV) ARTIFICIAL fibres. |
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| 4220. |
It is absolutely necessary to control the fisson reaction in nuclear power plants. |
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Answer» Solution :i. Large amount of energy is generated in a matter of second in a fission reaction . If the fission reaction is not controlled it can prove fatal. II. UNCONTROLLED fission reaction may lead to the emission of harmful radiations. iii. It can also lead to the MELTDOWN of the nuclear power plant. Thus, it is absolutely necessary to CONTROL the fission reaction in nuclear power PLANTS. |
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| 4221. |
Potential energy |
| Answer» Solution :A BODY can have ENERGY because of its shape or POSITION or CONFIGURATION. This is known as potential energy. | |
| 4222. |
What type of field is around stationary charge ? |
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| 4223. |
What is meant by heating ? |
| Answer» Solution :The PROCESS in which heat energy flows from an BODY at higher temperature to another OBJECT at lower temperature is KNOWN as "HEATING". | |
| 4224. |
A beaker containing water is balanced on the pan of a common balance. A solid of specific gravity 1 and mass 5 g is tied to the arm of the balance and immersed in water contained in the beaker. The scale pan with the beaker |
| Answer» Solution :remains unchanged | |
| 4225. |
Statethe conclusion that can be draw from the observation thata current- carryingwire deflects a magneticneedleplaced near it . |
| Answer» SOLUTION :A MAGNETICFIELDIS produced around a current- CARRYING CONDUCTOR . | |
| 4226. |
What furnishes the centripetal acceleration for theearth to go round the sun ? |
| Answer» SOLUTION :GRAVITATION FORCE of SUN. | |
| 4227. |
(a) Nameany three functional groups present in carbon compounds and write their formulae. (b) Draw the structures of the following compounds indicating the functional group present in each , propanal, propanone, propanoic acid, propanol |
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Answer» Solution :(a) . ALCOHOLIC group `RARR` -OH , Aldehyde `rArr` -CHO, KETONE `rArr` gtC=O (b) Propanol : `H-overset(H)overset(|)underset(H)underset(|)(C)-overset(H)overset(|)underset(H)underset(|)(C)-CHO"PROPANONE" H_(3)C-underset(O)underset(||)(C)-CH_(3)` Propanoic ACID `CH_(3)-CH_(2)-COOH "Propanol" CH_(3)-CH_(2)-CH_(2)OH` |
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| 4228. |
Write the disadvantage of telescope. |
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Answer» Solution :Advantages (i) Elaborate view of the Galaxies , Planetsstars and other heavenly bodies is possible (ii) Camera can be attached for taking photograph for the celextial objects. (iii) Telescope can be viewed even with the LOW intensity of light Disadvantages (i) Frequent maintenances needed. It is not EASILY portable ONE. |
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| 4229. |
Electrical resistivity for a given material is. . .. . . . . . . . |
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Answer» zero |
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| 4230. |
State wheteher the followingstatementsare trueof false. |
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Answer» An electric MOTOR converts mechanical energy into electricenergy. |
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| 4231. |
EDUSAT satellite inthe INSATand GSAT series is used specially in the field of education. |
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| 4232. |
List any two advantages of using wind energy. |
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Answer» SOLUTION :(i) ENVIRONMENT friendly. (ii) Efficient source of renewable ENERGY. (iii) No recurring expenditure. |
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| 4233. |
Define the term power of accomadation in eye. |
| Answer» SOLUTION :The ability of the eye lens to adjust its FOCAL LENGTH is called accomodation of the eye. | |
| 4234. |
Find the molecular mass of NaOH. |
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Answer» SOLUTION :Atomic MASS of 1 (NA) `= 1xx23=23` Atomic mass of 1 (O) `= 1xx16=16` Atomic mass of 1 (H) `=1xx1=1` |
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| 4235. |
Asseration : There is no effecta on other end when one end of the rod is only heated. Reason: Heat always flows from a region o lower temperature to higher temperature of the rod. |
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Answer» Both the ASSERTION and the REASON are TRUE and the reason is the correct explanation of the assertion |
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| 4237. |
An inclined plane makes an angle of 30^(@) with horiontal. A solid sphere rollinng down this inclined plane has a linear acceleration of |
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Answer» `(5g)/14` |
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| 4238. |
The greatest height to which a man can throw astone is h. The greatest distance upto which hecan throw the same stone is _____. |
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Answer» Solution :Maximum height ,`H=(u^(2) sin^(2)theta)/(2g)` `rArr H_("MAX")=(u^(2))/(2g)=h(a t theta=90^(@))` Max. Range `R_("max")=(u^(2))/(g)=2H`. |
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| 4239. |
Describe an activity to know the direction of magnetic field produced by a current-carrying straight conductor. Also show that direction of magnetic field is reversed on reversing the direction of current. |
Answer» Solution :To know the direction of magnetic field due to flow of current in a straight conductor let us prepare a series circuit consisting of a long straight copper wire PQ, a plug key and a battery [FIG. 13.17]. Place the straight wire over a compass needle such that the wire parallel to the direction of compass needle.  Apply plug in the key so that current BEGINS to flow, the compass needle deflects due to magnetic field produced due to flow of current in straight conductor. If current in wire flows from north to SOUTH (as shown in Fig. (a)], the north pole of the compass needle is seen MOVING towards the east. It shows that a magnetic field is produced by a current-carrying straight conductor. Now reverse the connections of battery so that current flows in the copper wire from south to north We find that north pole of compass is now deflected towards west [Fig. (b)]. This shows that on reversing direction of current, the direction of magnetic field is ALSO reversed. |
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| 4240. |
a) What happens if too much of acid is produced in the stomach? What is the remedy for this situation? b) What is water of crystallization? How is plaster of . The fixed numberparis prepared? Write any two uses of plaster ofparis . |
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Answer» Solution :(a) If too much of acid is produced in the stomach it causes hyperacidity (IRRITATION and pain). To get rid of this pain we have to use bases called antacids. It neutralises excess of acid and GIVES relief from pain caused by hyperacidity. (b) the fixed number of water molecules present in ONE FORMULA unit of a crystaline salt is called water of crystallisation. Plaster of paris is prepared by heating gypsum to a temperature of `100^@C.` The following reaction takes place : ` CaSO_4 . 2H_2O overset(100^@C)(to) CaSO_4 . 1/2 H_2O+ 1/2H_2O ` i) it is USED to prepare chalks . ii) It is used to make casts and moulds. |
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| 4241. |
Find the final temperature of a cooper rod. Whose area of cross section changes from 10 m^(2) to 11m^(2) due to heating. The copper rod is initially kept at 90K. (Coefficient of superficial expansion is 0.0021/K) |
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Answer» SOLUTION :Given: Area of copper rod `A_(0)=A_(1)=10 m^(2)` Changes of area CROSS section `DeltaA=A_(2)-A_(1)` `=11-10=1 m^(2)` nitial temperature `t_(1)=90 K` `Delta T=t_(2)-t_(1)` `DeltaT=t_(2)=90` Coefficient of superficial EXPANSION `alpha_(A)=0.0021//K` Then `t_(2)=?` `alpha_(A)=(DeltaA)/(A_(0)Deltat)` `0.0021=(1)/(10xx(t_(2)-90)) rArr t_(2)=90=(1)/(0.0021xx10)` `t_(2)-90=(1)/(0.021)` `t_(2)=(1)/(0.021)+90` `t_(2)=137.6 K` |
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| 4242. |
In the figure given, the position-time graph of a particle of mass 0.1 kg is shown the impulse at t = 2s is |
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Answer» 0.2 KG m/s =m(v-u) =0.1 (0-2) `=-0.2"kg m/s"` |
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| 4243. |
What is water harivesting ? How can this technique help in the conservation of water ? |
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Answer» SOLUTION :Water harvesting is a TECHNIQUE of capturingrain water when it falls and taking measures to keep the water clean. This water is stored underground that remains unpolluted , it RECHARGES wells and provides moisture for vegetation over a WIDE area. |
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| 4244. |
(i) Write two properties of gold which make it the most suitable metal for ornaments. (ii) Name two metals which are the best conductors of heat. (iii) Name two metals which melt when you keep them on your palm. |
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Answer» Solution :(i) Gold is malleable and ductile. (ii) COPPER and SILVER. (iii) GALLIUM and CAESIUM. |
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| 4245. |
Mr. Sharma was suffering from various types of diseases presently. He went for thorough health check-ups and was diagnosed to be HIV+ve. Soon this news spread in his neighbourhood and on account of this, he faced social isolation. Answer the following questions based on the information given above. (i) Do you think people's indifference towards HIV+ve people is justifiable? What kind of approach should we have toward the persons suffering from AIDS? (ii) How can one protect oneself from this disease? (iii) What values are not promoted by Mr. Sharma's neighbours? |
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Answer» Solution :(i) ABSOLUTELY not. We should exhibit humane approach/behaviour and should not TREAT them as isolated. (ii) One should be aware about the mode of transmission of disease, danger of sharing needles, transfusion of contaminated BLOOD, ETC. (iii) Sympathy for FELLOW human being, care, humane nature. |
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| 4246. |
If the volume of a block of metal changes by 12% when it is heated by 30^(@)C.What is the coefficient of linear expansion, |
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Answer» SOLUTION :% change in VOLUME `=(DELTAV)/(V)=12%=(12)/(100)` `DeltaT=30^(@)` `alpha_(v)=(DeltaV)/(V DeltaA)=(12)/(100xx30)=(4)/(100xx10)=4xx10^(-5)""^(@)C` `alpha_(V)=4xx10^(-5)""^(@)C` AS we know that `alpha=(alpha_(v))/(3) or alpha =(4xx10^(-5))/(3)` `alpha=1.33xx10^(-5)` per `""^(@)C` `:. beta=2 alpha` `:. beta=2xx1.33x10^(-5)=2.66xx10^(-5)` per `""^(@)C` |
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| 4247. |
A vessel is filled with a gas at a pressure of 76 cm of mercury at a certain temperature. The mass of the gas is increased by 50% by introducing more gas in the vessel at the same temperature. Find the resultant pressure of the gas. |
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Answer» SOLUTION :According to kinetic theory of gases, `PV=(1)/(3)mv_(rms)^(2)` At constant temperature, `v_(rms)^(2)` is constant. As `v`is ALSO constant, so `P PROP m`. When the mass of the gas increase by `50%` pressurealso increases by `50%`, `:.` Final pressure `=76+(50)/(100)xx76=114cm` of `Hg`. |
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| 4248. |
An observer moves towards a stationary plane mirror at a speed of 4 ms^(-1) . With what speed will his image move towards him? |
| Answer» Answer :C | |
| 4249. |
On what basis and how are the orbits of artificial stellites classified? Medium earth orbits: |
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Answer» Solution : Depending on the HEIGHT of the SATELLITE 's orbit above the earth's surface , the satellite orbits are classified as below : (a) If the height of the satellite orbit above the earth's surface is between 200 km and 35780 km , the orbits are called medium earth orbits . (B) In these orbits, the satellites complete one revolution in 2 to 24hours . (c) The geostationary satellites cannot be used in the STUDY of polar regions . For this purpose , elliptical medium earth orbits are also called as polar orbits. |
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| 4250. |
Sound can travel through solids, gases, liquids and even vacuum. |
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Answer» |
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