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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.
| 4701. |
The energy in the reactor of a nuclear power station is produced by the process of : |
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Answer» NUCLEAR diffusion |
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| 4702. |
What will be the speed of light in water if it is given that the refractive index of water is 4/3 and the speed of light in air is3 xx 10^(8) m/s? |
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Answer» Solution :`._2n_(1) = v_(1)/u_(2) therefore v_(1) = v_(1)/(._(2)n_(1))` ` v_(2) = ( 3XX 10^(8) m//s)/(4//3) = ( 9 xx 10^(8)` m/s The speed of light in WATER = `2.25 xx 10^(8)`m/s . |
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| 4703. |
(i) List any two criteria for selecting a good fuel. (ii) Explain how does burning of fossil fuels cause air and soil pollution. |
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Answer» Solution :(i) Criteria for selecting a good fuel : (a) Would do a LARGE AMOUNT of work per unit volume or MASS. (b) be easily accessible. (c) be easy to store and transport. (ii) BURNING of fuels releases gases like `CO_(2), SO_(2), NO_(2),`. These causes air pollution. With rain, these pollutants fall as acid rain and cause SOIL pollution. |
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| 4704. |
What are centripital force |
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Answer» Solution : Centripetal force: The force that acts on any object moving along as circle, DIRECTED TOWARDS the CENTRE of the circle is called centripetal force. |
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| 4705. |
A 400 W refrigerator operates for 16 h per day. Calculate the cost to operate it for 30 days at ₹3.40 per kWh. |
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Answer» Solution :Energy consumed `=("WATT"XX"hours"xx"No. of days")/(100)` `= (400xx16xx30)/(100) = 192 kWh` (UNIT) COST of energy consumed = RATE `xx` kWh |
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| 4707. |
…… scattering takes place when the diameter of the scatterer is similar to or larger than the wavelenght of the incident light. |
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Answer» Rayleigh |
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| 4708. |
Describe in brief the functions of the following parts in the human male reproductivesystem : (i) Testes(ii) Seminal vesicle(iii) Vas deferens (iv) urethra |
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Answer» Solution :(i) Male gametes (sperms) and male HORMONE testosterone are PRODUCED by testis. (ii) Seminal vesicles produce seminal plasma which in the form of fluid make the TRANSPORT of sperm smooth. (iii) The sperms formed are delivered through the the vas deferens which unites with a tube coming from the the urinary BLADDER. (iv) Urethra carries SEMEN and urine out of the body. |
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| 4709. |
State if an alpha particle [alpha particles are positively charged] experiences any force in a magnetic field if [i] it isplacedin the field and is at rest. [ii] it moves in the magnetic field parallelto field lines. [iii] it moves in the magnetic field perpendicular to field lines . Justify your answer in each case. |
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Answer» Solution :F = QVB sin `theta` i] When the alpha particle is at rest. its VELOCITY v = 0 and hence, MAGNETIC force f = 0. ii] When the alpha particle moves parallel to the magneticfield, `theta = 0^(@)` and hence sin `theta` = F = 0 . iii] When the alphaparticle moves perpendicular to the magnetic field, `theta = 90^(@)` . Then, sin `theta = L`and F = qv B, i.e., a maximum . Magnetic field exerts a force on the alpha particle perpendicular to both the magnetic field and its direction of motion . This force providesthe centripetal force to make theparticle move in a plane PERPENDICULARTO the magnetic field . |
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| 4710. |
Three resistors of 1Omega, 2 Omega and 4Omega are connected in parallel in a circuit. If a 1Omega resistor draws a current of 1A, find the current through the other two resistors. |
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Answer» Solution :`R_(1)=1OMEGA,R_(2)=2Omega,R_(3)=4Omega`, Current `I_(1)=1A` The potential DIFFERENCE across the `1Omega` RESISTOR `=I_(1)R_(1)=1xx1=1V` since, the RESISTORS are connected in parallel in the circuit, the same potential difference will exist across the other resistors also. So, the current in the `2Omega` resistor, `(V)/(R_(2))=(1)/(2)=0.5A` Similarly, the current in the `4Omega` resistor `(V)/(R_(3))=1/4=0.25A` |
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| 4711. |
Why did the clear sky appear blue? |
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Answer» Solution :The molecules of air and other fine PARTICLES in the atmosphere have size SMALLER than the wavelength of the VISIBLE light. These are more effective in scattering light of shorter wavelength at the blue end than the light of LONGER wavelength at the red end. Thus, the blue colour is due to the scattering of sunlight through fine particles in air. |
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| 4712. |
If a forceis acting on a moving body perpendicularto the direction of motino , then what will be its effect on the speed ofthebody ? |
| Answer» Solution :There is no change in speed. E.g. Forces ACTING on a BODY in CIRCULAR MOTION . | |
| 4713. |
In a series electric circuit ……is constant throughout the electric circuit. |
| Answer» SOLUTION :ELECTRIC CURRENT | |
| 4714. |
State and apply right-hand thumb rule to mark the direction of the field lines. |
| Answer» SOLUTION :SEE SHORT Answer QUESTION Number 2(b). | |
| 4715. |
A force of 15 N is required to pull up a body of mass 2 kg through a distance 5 m along an inclined plane making an angle of 30^(@) with horizontal as shown in fig calculate : (i)the work done by the force in pulling the body. (ii)The force due to gravity on the body, (iii)the work done against by the force due to gravity Take :g=9.8 m s^(-2). (iv)Account for the difference in answers of part (i) and part (iii). |
Answer» Solution : (i)Work done by the FORCE in pulling the body up W=Force x displacement in the direction of force =15 N `xx`5 m=75 J (ii)Force DUE to gravity on the body `F=mg=2xx9.8=19-6N` (iii)Work done against the force due to gravity W.=Force due to gravity `xx` vertical height moved `therefore BC=AB sin 30^(@)` Hence W.=mg `xx` AB sin `30(@)` `=19.6xx5xx(1)/(2) (because sin 30^(@)(1)/(2))` (iv)We note that W `gt` W. .The difference in work W and W. is 75 J-49 J =26 J.ACtually 26 J is the work done against the force of friction between the body and the inclined plane . |
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| 4716. |
Fatty acids and their functions. |
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Answer» Solution :(1) The fatty acids are COMPONENTS of the lipids. When lipids are digested, it forms fatty acids and alcohol (glycerol). (2) There are certain chemical bonds between fatty acids and alcohol. (3) Fatty acids are very essential for health. (4) After digestion, fatty acids are absorbed into the blood and transported to the cells. (5) DIFFERENT types of cells produce their own SUBSTANCES from these fatty acids. e.g. (a) Plasma membrane is produced from phospholipids. (b) Hormones like testosterone, progesterone, estrogen, aldosterone are produced from fatty acids. (c ) The axonal coverings around the neurons are ALSO made from fatty acids. |
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| 4717. |
During winter season, a white trail at the back of a flying plane is observed in a clear sky. Explain. |
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Answer» Solution :1.During winter SEASON, as the plane flies, the vapour released by the aeroplane's engine CONDENSES and fonns clouds. 2. If the surrounding air is having more relative HUMIDITY, it takes a long time for the white TRAIL formed by condensation of the vapour to disappear. 3. HENCE, a white trail at the back of a flying plane is observed in a clear sky. |
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| 4718. |
A real image, (2)/(3) rd of the size of an object, is formed by a convex lens when the object is at a distance of 12 cm from it. Find the focal length of the lens. |
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Answer» SOLUTION :Here distance of the object from the lens u = - 12 cm and magnification of real image `m = - (2)/(3)` As per relation `m = (v)/(u)`, we have v = mu = `(-(2)/(3)) xx (-12) = + 8` cm So as per lens formula `(1)/(v) - (1)/(u) = (1)/(f)`, we have `(1)/(f) = (1)/((+8)) - (1)/((-12)) = (1)/((8)) + (1)/((12)) = (5)/(24) RARR f = + (24)/(5) = + 4.8` cm |
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| 4719. |
Due to recall the sudden closing of any cartoon serial of foreign origin being telecast on television? |
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Answer» Solution :The cartoon serial, Shinchan'was banned in 2008 by the 'information and broadcastingministry , on the grounds of undersirability of its content The MINISTRY belevied that parents were worried about the show the cartoon SERIES SHOWED a naughty five-year-old BOY making the life of his parents miserable.The series was having a negative impact on kids .AS many parents requwsted the GOVERMENT, the serial was banned. |
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| 4720. |
By increasing the number of turns in the coil, the strength of the magnetic field |
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Answer» DECREASES |
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| 4721. |
Draw neat diagrams to show changes in images formed by a concave mirror, as an object is brought closer to it from infinity to just near its pole. Write the nature and size of the image in each case. |
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Answer» SOLUTION :Depending on the position of the object, six DIFFERENT types of images are formed by a CONCAVE mirror. Ray DIAGRAMS for these images have been drawn in Figure. The nature position and relative size of different images are as given in Point Number 13 under the heading "Chapter At A Glance". 
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| 4722. |
Explain solar cell panel. |
| Answer» Solution :A solar cell is device which CONVERTS solar energy directly into electricity. A group of solar cells is called a solar cell panel. It consists of a large number of solar cells joined togetherin definite pattern. It provided a LOT of electric energy required by artificial satellites, water pumps , street lighting ETC. For joining the various solar cells in a solar panel, silver WIRES are used because silver metal is the best conductor of electricity having a very low resistance and which also increases efficiency. | |
| 4723. |
Whatare the twomostcommonlyused domestic circuits ? |
| Answer» SOLUTION :(1) 5 A for low power ratingappliances and (2) 15Afor highpowerratingappliances . | |
| 4724. |
Describe the working of an AC generator with the help of a labelled circuit diagram. Whatchanges must be made in the arrangementto convert it intoa DC generator ? |
| Answer» SOLUTION :To convert an AC generatorinto DCgenerator, a SPLIT RING commutatorshould be used in the placeof slip rings. This helpsisproducing UNIDIRECTIONAL , i.e., direct current. | |
| 4725. |
Considering the first correlation, complete the second. INSAT: Wather satellete :IRS ……. |
| Answer» SOLUTION :INSAT: WEATHER SATELLITE : IRS :Earth observation satellite. | |
| 4727. |
At what temperature the value of celcius and fahrenheit scale concid. |
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Answer» Solution :Let `T_(C)=T_(F)=X` `(T_(C)=0)/(100)=(T_(F)-32)/(180)` `(x)/(100)=(x-32)/(180)` `100x-3200=180 x` `-80x=3200` `x=(-3200)/(80)` `=-x-40^(@)` |
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| 4728. |
In 2008, ISRO successfully launched it and placed it into anorbit around the moon. |
| Answer» SOLUTION :CHANDRAYAAN -1 | |
| 4729. |
Elements having atomic number greater than 83 can undergo nuclear fusion. : True or False |
| Answer» Solution :CORRECT Statement: ELEMENTS having atomic number greater than 83 can UNDERGO nuclear fusion. | |
| 4730. |
What are the advantage of ac over dc. |
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Answer» Solution :Advantages 1. It is cheaper to generate ac. 2. The ac generators are more efficient. 3. The loss of ENERGY during ac transmission is negligible. 4. The ac can be easily CONVERTED into DC. 5. The value of ac can be easily CHANGED. |
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| 4731. |
List out the materials required for the Oersted experiment of electromagnetism. Write the procedure of its experiment. What do you understand by this experiment? |
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Answer» SOLUTION :List of material required for Oersted experiment: A thermocole sheet, two small sticks , insulated copper wires, 9V battery, switch, magnetic compass. Procedure : 1) Take a thermocole sheet and fix two THIN WOODEN sticks of height 1 cm which have small slit at the top of their ends. 2) Arrange a copper wire . So that it passes through these slits and make a CIRCUT. 3) The circuit consists a 9 V battery ,key and copper wires connected in series. 4) Now keep a magnetic compass below the wire. 5) Now switch on the circuit and observe the compass NEEDLE. Change the directions of current and observe the compass needle . Observations: 1) WHen current is passed through circuit, we observed deflection of compass needle in one direction. 2) When the direction of current is changed, the compass needle deflects in another direction. From the above experiment I understood that a current carrying conductor possesses magnetic field around it. |
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| 4732. |
Which of the statement given below correctly describes the magnetic field near a long, straight current carrying conductor ? |
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Answer» The magnetic LINES of force are in a plane, perpendicular to the CONDUCTOR in the form of straight lines. |
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| 4733. |
A man can jump 1.5m on the Earth. Calculate the approximate height he might be able to jump on a planet whose density is one-quarter that of the Earth and whose radius is one-third that of the Earth. |
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Answer» Solution :`G=(4)/(3)PI GRp` `g'= (4)/(3)pi GRp'` The gain in P.E. at the highest point will be same in both CASES. Hence `mg'h'= mgh` `g' =(mgh)/(mg)= (mxx(4)/(3)pi RGPH)/(m(4)/(3)piRGp')` `=(Rph)/(R'p')=(3R'xx4p'xx1.5)/(R'xxp')` `=18m`. |
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| 4734. |
A metallic conductor is suspended perpendicular to the magnetic field of a horse shoe magnet. The conductor gets displaced towards left when a current is passed through it. What will happen to the displacement of the conductor if the: (i) current through it is increased ? (ii) horse-shoe magnet is replaced by another stronger horse-shoe magnet? (iii) direction of current through it is reversed? |
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Answer» Solution :(i) On increasing the current flowing through METALLIC CONDUCTOR, the force experienced by it is proportionately increased because `Fprop l`. (ii) On using a stronger horse-shoe magnet the magnetic force increases because `F prop B` . (iii) On reversing the direction of current the direction of force is reversed and conductor is DISPLACED towards right instead of LEFT direction. |
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| 4736. |
Calculate the kinetic energy of a body of mass 2 kg moving with speed of 10 m s^(-1) |
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Answer» SOLUTION :GIVEN:m=2 KG ,v=10 m `s^(-1)` KINETIC energy =`(1)/(2)mv^(2)=(1)/(2)xx2xx(10)^(2)` |
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| 4737. |
Define geothermal energy |
| Answer» Solution :The heat energy obtained from hot MOLTEN ROCKS inside the earth.s CRUST is called GEOTHERMAL energy | |
| 4738. |
Dcotor has prescribed a lens having power+ 1.5D. What will be the focal length of the lens? What is the type of the lens and what must be the defect of vision? |
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Answer» Solution :Given: Power = + 1.5 D To find: Focal length Type of lens DEFECT of the eye Solution : Power = `(1)/(f("in Meter"))` + 1.5 `= 1/f ` f` = 1/1.5` `f = 1/1.5 XX 100 cm` therefore f = + 66.67 cm` `therefore f = + 0.67 m ` Type of lens = Convex lens Defect in eye = hypermetropia or FARSIGHTEDNESS. |
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| 4740. |
Explain giving reasons the bending of the shoot tip of a plant towards light source soming from one side of the plant. |
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Answer» Solution :(i) When a PLANT gets light from ONE side. (ii) The shoot tip has a GROWTH hormone called auxin. (iii) It diffuses to side other than the one receiving light. (IV)It brings about growth on the other side, which is dark. (v) Since this side grows more than the side, which has received light, the stem appears to bend towards light. 
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| 4741. |
The electronic configuration of element x is 2, 8, 8, 1 and the electronic configuration of element Y is 2, 8, 7. Them the type of bond formed between these two element is |
| Answer» Answer :D | |
| 4742. |
A student traces the path of a ray of light passing through a rectangular glass. Slab. For measuring the angle of incidence, he must position the protractor in the manner shown in figure : |
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Answer» A |
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| 4743. |
The focal length of a convex lens is 20 cm. If an object of height 2 cm is placed at 30 cm from the lens, find (i) the position and nature of the image(ii)the height of the image (iii) the magnification produced by the lens. |
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Answer» Solution :`1/f 1/v - 1/u` ` therefore1/u = 1/f + 1/u = 1/(20 cm) + 1/(- 30 cm) = 1/( 20 cm) - 1/ (30 cm)` ` = ( 3-2)/( 60 cm) = 1/( 60 cm)` v= 60 cm , v is positive. The image will be formed at 60 cm from the lens and on the other side of the lenswith RESPECT to the OBJECT. It is a real image. (ii) ` h_(2)/h_(1) = u/v` ` h_(2)/(2 cm) = (60 cm)/(-30 cm) = -2 ` `h_(20 = -2 XX 2 cm = - 4 cm` `h_(2) ` is negative. This shows that the image is inverted . The height of the image = - 4 cm (III) ` M = h_(2)/h_(1) = ( - 4 cm)/(2 cm) = -2 ` M is negative, indicating that teh image is inverted. The magnification produced by the lens = -2 |
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| 4744. |
What is afforestation? List the programmes carried out under this scheme . |
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Answer» Solution :Afforestation. Looking at the rapid destruction rate of forest, National agriculture commision started a scheme in 1976 called social forestry. Under this scheme such trees were to be planted which give the fuel wood to the local people, fodder for their animal, tools for agriculture, -some teak for MAKING houses and minor forest produce etc. Many afforestation programmes have been taken in hand by central and state governments. 1. Social Forestry Programme (1976). It requires raising trees for fuel wood, fodder, agricultural implements and fruits on public and COMMON lands for the benefit of rural community. The programme is aimed at REDUCING the demand on existing forests needed for soil and water conservation. 2. Agroforestry Programme . It is aimed at reviving the ancient practice of USING the same land for farming, forestry and animal husbandary. 3. Urban Forestry Programme. It is aimed at GROWING ornamental and fruit trees in urban areas along roads, in privats compounds and in common parks. |
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| 4745. |
N kg^(-1) is the unit of |
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Answer» RETARDATION |
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| 4746. |
Explain the role of roal contraceptive pills in preventing conception. |
| Answer» SOLUTION :Oral contraceptives are COMBINATION of FEMALE hormones. They increase the levels of PROGESTERONE. HENCE, they prevent ovulation. Because there is no ovulation hence no fertilisation and no pregnancy. | |
| 4747. |
_______ lenses are used as wide angle spy hole in doors. |
| Answer» Solution :Correct Statement : Diverging lenses or CONCAVE lenses are used in WIDE angle SPY hole in doors. | |
| 4748. |
State the rule whichgives the directionon indcued current . |
| Answer» Solution :Ruleis FLEMINGS .RIGHT - handrule . Forits statement, SEE Point Number16 under the HEADING" ChapterAt A GLANE . | |
| 4749. |
What is solar constant? |
| Answer» SOLUTION :The solar energy falling on the earth.s atmosphere exposed perpendiculary to the RAYS of the Sun at the average distance between the sun and earth is known as the solar constant. It is estimated to be. 1.4kw PER SQUARE METER | |
| 4750. |
The highest refractive index is of : |
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Answer» glass |
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