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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.
| 6401. |
What are the environmental consequences of using fossil fuels? Suggest the steps to minimze the pollution caused by various energy sources, including non-conventional sources of energy. |
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Answer» Solution :(i) The buning of fossil fuels produces greenhouse effect of gases through carbon dioxide and results in global WARMING. (ii) The burning of fossil fuels also releases oxides of nitrogen and sulphur which are acidic oxides. These lead to formation of acid rain which affects our water and SOIL resources. Pollution caused by combustion of coal, petroleum conventional SOURCES). and biomass non-conventional sources can be reduced by increasing the efficiency of the combustion process and using various techniques to reduce the ESCAPE of HARMFUL gases and ashes into the surroundings. The effect of greenhouse gases released by burning of fossil fuels and biaogas can be minimized by planting more trees. Pollution due to nuclear waste can be minimized by property disposing nuclear wastes. |
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| 6402. |
Is the position of image same as the position of object when object and image sizes are equal in a mirror? |
| Answer» Solution :YES,OBJECT and IMAGE positions are the same (i.e. at the CENTRE of curvature). | |
| 6403. |
.......... is the longest period in the periodic table. |
| Answer» Solution :Sixth period | |
| 6404. |
Which sources produce alternating current? |
| Answer» Solution :Alternating CURRENT is produced by A.C. generators. There are hydro-generator and thermal generators. HYDROGENERATORS convert P.E. of water to ELECTRICITY whereas thermal generators convert HEAT energy of STEAM to electric energy. | |
| 6405. |
If the solar constant is 1.4 kW//m^(2), then the solar energy received by 1 m^(2) area in one hour is : |
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Answer» 5040 J |
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| 6407. |
Weighlessness in a satellite is because of |
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Answer» inertia |
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| 6408. |
Plotting a graph for momentum on the X-axis and time on Y-axis. Slope of momentum-time graph gives …………………………………... |
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Answer» impulsive FORCE |
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| 6409. |
Microbial enzymes : |
| Answer» SOLUTION :(1) Microbial ENZYMES carry out specific processes even at low temperature, PH and pressure. (2) Unnecessary BYPRODUCTS are not farmed which reduce expenses on purification. (3) They save ENERGY. ( 4) They reduce the necessity of erosion-free instruments. | |
| 6410. |
Acid rain is caused by the oxides of |
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Answer» CARBON |
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| 6412. |
(i) A beam of white light splits when it passes through a prism. Name this phenomenon and give its reason. (ii) List the colours into which it splits in the decreasing order of their bending on emergence from prism. |
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Answer» Solution :(i) Dispersion of white light consists of seven COLOURS of different wavelengths. These components of light travel with different SPEEDS in glass and GET refracted by different angles, DUE to this splitting of white light takes place. (ii) Violet, Indigo, Blue, Green, Yellow, ORANGE, Red. |
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| 6413. |
The radius of curvature of a concave mirror is 50 cm. Where should an object be placed from the mirror so as to form its image at ifinity? Justify your answer. |
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Answer» SOLUTION :Here R=50 cm `f=R/2=50/2=25cm` The object held at FOCUS, that is 25 cm from the mirror, will have its IMAGE at INFINITY. |
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| 6414. |
Out of C_(2)H_(6) and C_(2) H_(4). Identify the saturated compound. Give reason in support of your answer |
| Answer» SOLUTION :`C_(2)H_(6)` is SATURATED compound as it shows only the substitution reaction. | |
| 6415. |
Calculate the number of electrons constituting one coulomb of charge? |
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Answer» SOLUTION :We know that the value of charge on an electron `e=1.6 TIMES 10^-19 C` `therefore` NUMBER of electrons CONSTITUTING 1C of charge `n=Q/e=(1C)/(1.6 times 10^-19 C)=6.25 times 10^18` |
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| 6416. |
Which of the process described below are irrevesible? |
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Answer» The increase in temperature of an iron rod by hammering it |
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| 6417. |
Om, Rohit and Kishore always remain in a hurry. One day, during lunch hour Om and Rohit started gulping food quickly. Kishore told them to eat slowly. But they didn't listen to him and went out to play. Om suddenly developed stomach ache while playing. Answer the following questions based on the situation mentioned above. (i) What according to you might have gone wrong with him? (ii) What advice would you give to him? (iii) What values are promoted by Kishore? |
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Answer» Solution :(i) Om DEVELOPED stomach ache as he had not chewed his food properly. Chewing food properly HELPS in proper breakdown of food and mixing it with saliva. Large food pieces if ENTER the stomach MIGHT cause damage. (II) Chew your food properly for healthy digestion. (iii) Caring, health conscious and aware. |
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| 6418. |
What is meant by power of a lens? Define its S.I.unit. You have two lenes A and B of focal lengths + 10 cm and - 10 respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnigied image of an object placed 8 cm from the lens? Draw a ray diagram tojustify your answer. |
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Answer» Solution :POWER of a LENS and its S.I. unit . The power of a lens is a measure of the degree of CON- reciprocal of its focal length rays FALLING on it. The power of a lens is defined as the reciprocal of its focal length in metres. Power of a Lens = `(1)/(" Focal length (in m)")` Lens A: `F_(A) = + 10 cm = (+10)/(100) = 0.1m, P_(P) = (1)/(F_(A)) = (1)/(+0.1) = + 10 D` The power of a convex lens is positive therefore, lens A is a conbex lens. Lens B: `F_(B) = -10 cm = (-10)/(100) = - 0.1m,P_(B) = (1)/(F_(A)) = (1)/(-0.1) =- 10 D` The power of a concave lens is negative therefore, lens . What an object is placed at 8 cm (i.e., between the optical centre and principal foucs) only convex lens will form the virtual and magnified image. Therefore, lensA will form a virtual and magnified image of the object placed 8 cm from it. When the object is placed wetween the optical centre and the focus: (i.e., between O and F') the image formed is behined the object (on the same side), virtual, ERECT and magnified. 
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| 6419. |
The SI unit of electric charge is the ……………… . |
| Answer» Solution :coulomb | |
| 6420. |
A, B and C are three forces each of magnitude 4N acting in the plane of paper as shown in fig.1.26 Point O lies in the same plane. (i) Which force has the least moment about O? Give reason. (ii) Which force has the greatest moment about O? Give reason. (iii) Name the forces producing (a) clockwise , (b) anticlockwise moments. (iv) What is the resultant torque about the point O? |
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Answer» SOLUTION :(i) C, because force C is NEAREST to O (ii) A, because force A is farthest from O (iii) (a) A and B (b) C (IV) 4.4 N m (CLOCKWISE) |
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| 6421. |
What does the divergence of magnetic field lines near the ends of a current-carrying straight solenoid indicate? |
| Answer» SOLUTION :The divergence, that is, the falling degree of closeness of magnetic field lines indicates the fall in strength of magnetic field NEAR and beyond the ENDS of the SOLENOID. | |
| 6422. |
(a) Write the function of each of the following parts of human eye : Cornea, iris, crystalline lens, ciliary muscles. (b) Millions of people of the developing countries of world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate in this mission how would you contribute in this noble cause? (i) State the objective of organising such campaigns. (ii) List two arguments which you would give to motivate the people to donate their eyes after death. |
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Answer» Solution :(a) (i) Cornea - Refracts the rays of LIGHT falling on the eye. (ii) Iris - Controls the size of the pupil. (III) CRYSTALLINE lens - Focuses the image of the object on the retina. (iv) Ciliary muscles - Holds the eye lens and adjusts its focal length. (b) (i) Objectives - To make people AWARE and realize their duties towards society. (ii) (a) One person can give sight to two people. (b) Our eyes can live EVEN after our death. |
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| 6423. |
The resistance of a wire of length 10 m is 2 ohm. If the area of cross section of the wire is 2xx10^(-7)m^(2), determine its (i) resistivity (ii) conductance and (iii) conductivity |
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Answer» Solution :Given : LENGTH, `L=10`m, Resistance, `R=2` ohm and Area, `A=2xx10^(-7)m^(2)` Resistivity `rho=(RA)/(L)=(2xx2xx10^(-7))/(10)` `=4xx10^(-8)OMEGAM` Conductance, `G=(1)/(R )=(1)/(2)=0.5` mho Conductivity, `SIGMA=(1)/(rho)=(1)/(4xx10^(-8))` `=0.25xx10^(-8)"mho m"^(-1)` |
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| 6424. |
When a body is taken poles to equator on the earth, its weight |
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Answer» increases |
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| 6425. |
A whistle giving out a sound of frequency 450Hz , approaches a stationary observer at a speed of 33ms_(1). The frequency heard by the observer is (speed of sound =330m s_(1)____. |
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Answer» `=((330)/(330-33))xx450=1.11xx450` n.=500Hz Data: `v=330ms^(-1)` `v_(s)=33ms^(-1)` n=450Hz n.=? |
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| 6426. |
Menstrual cycle. |
Answer» SOLUTION : 
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| 6427. |
The magnitude of the AC voltageused in India is…….and itsfrequency is……… |
| Answer» Solution :220 V, 50Hz | |
| 6428. |
What causes twinkling of stars ? |
| Answer» Solution :The refractive index of the earth.s atmospheres keeps varying in different regions. With increasing altitude, it goes on DECREASING due to decreasing DENSITY of AIR. Hence, the starlight entering the earth.s atmospere UNDERGOES continuous refraction is bent TOWARDS the normal before eaching our eyes. This causes changes in intensity of starlight entering our eyes. Thus, stars appear to be twinkling. | |
| 6429. |
An electron enters a magnetic field at right angles to it as shown in fig. The direction of the force acting on the electron will be : (a) To the right , (b) to the left , (c) out of the page, (d) into the page. |
| Answer» Solution :When a force conductor carrying current is placed perpendicular to the DIRECTION of magnetic field, the magnetic field acting on it is given by Fleming.s LEFT hand rule. SINCE the directiorn of current is the same as that of the motion of a positive charge, the direction of force acting on it when movin8 perpendicular to the direction of magnetic field is the same as that acting on a current-carrying conductor placed perpendicular to the direction of magnetic field. Obviously, the force acting on an ELECTRON is opposite to that. THEREFORE in this case it is into the page. | |
| 6430. |
What is transcription? |
| Answer» Solution :The PROCESS of synthesis of mRNA as PER the nucleotide Present in DNA is called transcription. The nucleotide sequence . sequence on mRNA is COMPLIMENTARY to that of the single DNA strand used in synthesis. INSTEAD of THYMINE, mRNA possesses uracil. | |
| 6431. |
The living component of xylem tissue is |
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Answer» XYLEM vessel |
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| 6432. |
If you could use any sources of energy for heating your food, which one would you use and why? |
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Answer» SOLUTION :We WOULD use a microwave oven for heating the food as it heats the food unlformly and cleanly without loss in its utritional value. OR Natural GAS can be used for heating and cooking food because it is a clean ENERGY source. It does not produce a huge amount of smoke on burning. Although HIGHLY inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning. |
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| 6433. |
Fuse of 3A, 5A and 10A are available. Calculate and select the fuse for operating electric iron of 1 kW power at 220 V line. |
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Answer» Solution :Power rating of electric IRON =1 kW = 1000 W V= 220 V P = VI `I =(P)/(V)= (1000)/(220)` = 4.55 A Hence, a FUSE of rating 5 A can be USED because it can bear the CURRENT. |
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| 6434. |
On whatfactors do the magnetic field produced by a straight current-carrying conductor depend ? |
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Answer» Solution :i] Magnitudeof current passing through the CONDUCTOR: Themagnitude of the MAGNETIC field producedat a given point is directly proportional to the current passing through the conductor . B `prop` l ii] Distance from the WIRE : The magnitude of themagnetic field produced by a given current in the wire is inversely proportional to the distance from the wire B `prop` l/r |
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| 6435. |
Name the part of eye where the image is formed in a nornaml human eye. State how the image position changes in myopia and hypermetropia. |
| Answer» SOLUTION :In a normal human EYE, image is formed on the RETINA. In case of MYOPIA, image is formed in front of the retina and in hypermetropia, image is formed BEHIND the retina. | |
| 6436. |
Imagine that you are sitting in achamber with you back to one wall. An electron beam , movinghorizontlly from back wall towards the front wall , is deflected by a stong magnetic fieldtoyourright side. What is thedirectionof magneticfield ? |
Answer» Solution : For reference , see figure (a) and (b) . Thedirectionof the conventional CURRENTIS oppositeto thedirectionof motionofthe ELECTRON . ApplyingFleming.s LEFT - hand RULE , we find that when the MIDDLE fingerpoints in the direction of thecurrent and the thumb points in the direction of the force ,the forefinger points downward givingthe direction of themagneticfield . |
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| 6437. |
What is the far point and near point of the human eye with normal vision ? |
| Answer» Solution :For a HUMAN eye with NORMAL VISION, FAR point is infinity and NEAR point is 25 cm. | |
| 6438. |
Four student A,B,C and D performed an experiment to detemine the focal length of a concave mirror by using a lighted candle kept at a considerable distance as the object. They represented the position of image by drawing the following diagrams : Which diagram describes the correct position of the image of the candle ? |
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Answer» A |
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| 6439. |
The construction of turbine is different for different types of power plants. |
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Answer» Solution :i. In a powerplant a turbine is used to rotate the generator which produces the energy . ii.To drive the turbine , we need an energy source. iii.The construction of the turbine in a power plant depends on the type of energy SOUCE which is being used to rotate the turbine. For example: STEAM turbin is used to rotate the turbine while wind turbine with LARGE fins is used in electricity generation using wind energy. HENCE depending on the energy source the construction of turbine is different for different TYPES of power plants. |
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| 6440. |
The type of lens present in the human eye is |
| Answer» Solution :Convex | |
| 6441. |
Explain induced potentialdifference(orelectromotiveforce) andinduced electriccurrent . On whatfactordoesinduced potential differnce (or electromotiveforce) depend ? |
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Answer» Solution :Becauseof the rate of changeof numberof magnetic fieldlines linkedwiththe loop duringthe relativemotionof a magnet and loop or dueto a changing currentin a nearbyconductoran ELECTRIC potenital differenceis induced in the coil . It is called induced POTENTIAL difference ( orelectromotiveforce). Due to this electric current . Theelectromotivefroceinduced in a loop is proportionalto therate of changeof numberof magneticfieldlines associated withthe loop and the number ofturns of a loop . Important NOTES: (1) Induced currentis (i) proportionlto induced electromotiveforce and (ii) inverselyproportional to teh resistancein the CIRCUIT . (2) If the circuit is open , there can beinducedelectromotive forcebut there is no current . |
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| 6443. |
A doctor has prescribed of corrective lens of power +1.5D. Find the focal length of the lens. Is the prescribed lens diverging or converging |
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Answer» SOLUTION :POWER of LENS, P=1/f P=1.5D f=1/1.5=1/15=0.66m A convex lens has a positive focal LENGTH. HENCE it is a convex lens or a converging lens. |
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| 6444. |
Some of the sources of direct current are dry cell battery, car battery, and dc generator. |
| Answer» SOLUTION :Some of the SOURCES that PRODUCE ALTERNATING current are bicycle dynamos, CAR alternators and power house generators. | |
| 6445. |
Five persons A, B, C, D and E have diabetes, leukemia, asthma, meningitis and hepatitis, respectively. (a) Which of these person can donate eyes ? (b) Which of these persons cannot donate eyes ? |
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Answer» |
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| 6446. |
Draw a simple circuit with an ammeter, a voltmeter, a resistors, a key and a battery. |
Answer» SOLUTION :
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| 6447. |
A person needs a lens of power 5.5 dioptre for correcting his distant vision. For correcting his near vision he needs a lens of power+ 1.5 dioptre. What is the focal length of the lens required for correcting (i) Distant vision and (ii) Near vision? |
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Answer» Solution :For distance vision =0.181m, for near vision=0.667m.The POWER P of a lens of FOCAL length F is given by the reaction `p=(1)/(F("inmeters"))` (i) Power of the lens used for correcting distant vision == -5 .50 Focal length of required lens`F= (1)//(p)` `F=(1)/(-5.5)=0.181m`The focal length of the lens for correcting distance vision is 0.181. (ii) Power of the lens used for correcting near vision =+ 1.5D Focus length of the required lens,`F=(1)//(P)` `F= (1)/(1.5)=+0.667m.` |
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| 6448. |
Aves and Mammalia |
Answer» SOLUTION :
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| 6449. |
The process of release of eggs from the ovary is called : |
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Answer» MENSTRUATION |
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| 6450. |
the angle between the vectors (hati+hatj) and (hatj+hatk) is |
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Answer» `30^(@)` `=((hati+hatj)*(hatj+hatk))/(SQRT(1+1)+sqrt(1+1))=(0+1+0)/(2)` `cos theta = (1)/(2) cos 60^(@)` `theta=60^(@)` |
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