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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.
| 8201. |
What is the difference of colours of the sun observed during sunrise/sunset and noon? Give explanation of each? |
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Answer» Solution :(i) Scattering of light: PHENOMENON of spreading of light (diffused reflection) by minute particles in a MEDIUM. (ii) The sky appears blue because the blue colour of sunlight SCATTERS much more strongly than the red colour by particles in atmosphere/ air due to its shorter wavelength. (iii) At sun-rise and sun-set most of the blue light and shorter wavelengths are scattered away by the particles in the atmosphere as the light from the sun near the horizon passes through thick layers of air and larger distance. The light that reaches US is of LONGER wavelength (red colour) giving a reddish appearance. |
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| 8202. |
Nowadays school going children suffer from mental stress. |
| Answer» Solution :(1) These DAYS children stay in nuclear families without grandparents. (2)MOTHER of the house is also away for long period of time. This makes the children alone in the house. (3) At school and during studies, there is fierce competition andinsecurity . (4) The modern technology like internet or mobile phones are luring the children away from their regular exercises or outdoor games. (5) Thewrongking of peerpressure introduces addictive substances at the young age. (6) These FACTS creats emotional burden on the young MINDS and thus they suffer from mental stress. | |
| 8203. |
How has traditional use of wind and water energy been modifled for our convenience? |
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Answer» Solution :Traditionaly, waterfalls were used as a source of POTENTIAL energy which was converted into electricity with the help of turbines. Since waterfalls are few in number, water dams have been constructed in large numbers. Nowadays, hydrodams are used to HARNESS the potental energy of stored water. In water dams, water falls from a height on the turbine, which produces electricity . Earlier, the windmills were used to harness wind energy to do mechanical WORK such as lifting and drawing water from a well. Today, windmills generate electricity. In windmills, the kinetic energy of wind is harnesed and converted into electricity. The rotatory MOTION of the blades turns the turbine of an electric GENERATOR to generate electricity |
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| 8204. |
Whatwould be its weight on the moon in Q 57 ? |
| Answer» Answer :A | |
| 8205. |
If the resultant force acting on a body is zero , then the body will be in ___________. |
| Answer» SOLUTION :EQUILIBRIUM | |
| 8206. |
In a circuit if resistors of 5 Omega and 10 Omega are connected in series, compare the current passing through the two resistors. |
| Answer» Solution :In SERIES arrangement of RESISTANCES, same current FLOWS through all the resistors. | |
| 8207. |
Thereis noatmosphereon moon , Therefore |
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Answer» No soundcan beheard |
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| 8208. |
A container has equal number of molecules of hydrogen and carbon dioxide. If a fine hole is made in the container, then which of the two gases shall leak out rapidly ? |
| Answer» Solution :grahm's law of diffusionrate of leakage is INVERSELY proportional to square root of density of gas.density of HYDROGEN is SMALLER than density of carbon dioxide.so, hydrogen leak more rapidly than OXYGEN. | |
| 8209. |
A pulley system with a velocity ratio of 4 is used to lift a load of 150 kgf through a vertical height of 20 m. the effort required is 50 kgf in downward direction. Calculate: (a) the distance moved by the effort. (b) the work done by the effort. (c) the mechanical advantage. (d) the efficiency of the pulley system, and (e) the total number of pulleys and the number of pulleys in each block. (g=10N" "kg^(-1)). |
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Answer» Solution :GIVEN: `V.R.=4,L=150kgf,d_(L)=20m`. `E=50kgf=50xx10N=500N,d_(E)=?` (a) V.R.=`("distance MOVED by effort "d_(E))/("distance moved by load "d_(L)) or 4=(d_(E))/(20)` `therefore` Distance moved by the effort `d_(E)=20xx4=80m` (b) Work done by the effort=effort `EXX`distance `d_(E)` `=500Nxx80m` `=40000J`. (c) Mechanical ADVANTAGE`=(L)/(E)=(150)/(50)=3` (d) Efficiency=`(M.A.)/(V.R.)xx100%=(3)/(4)xx100%=75%` (e) The TOTAL number of pulleys=4 The number of pulleys in each block=2 |
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| 8210. |
Which one of the following substances is not used for making solar cells |
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Answer» silicon |
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| 8211. |
Conversion of metals into compounds : Thiobacilli : : Conversion of uranium salts : ….. |
| Answer» SOLUTION :Geobacter | |
| 8212. |
Name the major constituents of biogas and their approxinate percentage content in it. |
| Answer» SOLUTION :METHANE: 45% to 65% CARBON dioxide : 30% to 40%. | |
| 8213. |
At what height from the surface of earth will the value of g be reduced by 36% from the value on the surface? Take radius of earth R = 6400 km. |
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Answer» SOLUTION :`G'= 64% " of "g= (64)/(100)g` `g' = g(R^2)/((R+h)^2)= (64)/(100)g` `(R )/(R+h)= (8)/(10)` `h=(R )/(4)=1600 KM`. |
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| 8214. |
How is environment balance maintained ? |
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Answer» Solution :Environment balance is maintained in the following ways `:` i. Continuous OPERATION of environment cycles like water CYCLE,carbon cycle and gaseous cycles like nitrogen cycle, oxygencycle, etc. ii. EXISTENCE of food chain SYSTEM in VARIOUS ecosystem like terrestrial ecosystem ,aquatic ecosystem, etc. |
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| 8215. |
In order to get a current of 0.5A in a circuit by connecting a bulb of resistance 20Omega with 12V battery, what should be the resistance to be connected in series? What will be the voltage drop across the bulb? |
| Answer» Solution :`R = 4 Omega, V =10 V` | |
| 8216. |
What will be the refractive index of a transparent medium if the speed of light in the transparent medium is found to be 2.4 xx 10^(8) m//s ? |
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Answer» Solution :DATA `: C = 3 XX 10^(8) m//s, v = 2.4 xx 10^(8) m//s , N = ?` `n = ( c )/( v ) = ( 3 xx 10^(8) m//s )/( 2.4 xx 10^(8) m//s )` `=(3)/( 2.4) = ( 30)/( 24) = ( 5)/( 4)= 1.25` The absoluterefractive index of the medium `= 1.25 ` |
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| 8217. |
On an average a human heartis found to beat 75 times in a minute. Calculate its beat frequency and period. |
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Answer» |
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| 8218. |
Assertion (A): Copper and aluminium are two metal which are most commonly used for current electricity. Reason (R ): Conductors are those substances in which electric charge can flow freely. |
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Answer» Both (A) and (R ) are TRUE and (R ) is correct explanation of the ASSERTION |
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| 8219. |
Give a formula to find refractive index of a glass slab in terms of angle of incidence and angle of refraction. |
| Answer» Solution :REFRACTIVE index `n = (SIN i)/(sin R)`, where i = angle of incidence in air and r = angle of refraction in GLASS SLAB. | |
| 8220. |
is it possible to enjoy a rainbow at fountain in any season. |
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Answer» Solution :(i)The phenomenon of rainbow ISA combined effect of dispersion, internal reflectionand refraction. (ii) The rainbow appears in the sky after a rainfall. (iii) The water droplets of a fountain also ACT as small prisms as the rain drops. (iv) When the LIGHT rays enter these droplets, it first gets DISPERSED, then internally reflected and then refracted while COMING out of the droplets. All these three processes together produce the rainbow. |
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| 8222. |
(i) A diverging lens of focal length 15 cm, forms an image at distance of 10 cm from the lens. How far is the object placed from the lens ? (ii) Under what condition a diverging lens when placed in a medium behaves as a converging lens |
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Answer» Solution :(i) f = -15 CM,v = -10 cm,u = ? `1/u = 1/v - 1/f = - 1/10- (1)/(-15) = (-1)/(30) "" therefore u = -30 cm` (ii) Condition: when refracive INDEX of medium GT refractive index of MATERIAL of lens. |
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| 8223. |
State any three advantages of using charcoal over wood? |
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Answer» Solution :(i) It produces LARGE AMOUNT of HEAT energy. (II) It is SMOKELESS and pollution free. (iii) It is easy to store and transport. |
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| 8224. |
Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen ? (ii) why is the light of a single colour used ? |
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Answer» SOLUTION :(i) The glass piece is not seen when the refractive INDEX of liquid becomes equal to the refractive index of glass. (ii) Light of a single colour is used because the refractive index of a medium (glass or liquid) is DIFFERENT for the light of different COLOURS. |
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| 8225. |
Reflection of sound waves obey the |
| Answer» SOLUTION :LAWS of REFLECTION | |
| 8226. |
Give Scientific reasons . In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc, an alloy such as Nichrome is used, not pure metals. |
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Answer» Solution :1.Electric equipments producing HEAT MAKE use of heating EFFECT of electric current. 2. Electrical conductors having HIGHER RESISTIVITY are used here. 3. Nichrome is an alloy and therefore it has a higher resistivity than pure metals. 4. Hence, nichrome is used to get higher amount of heat. |
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| 8227. |
What is the change in image observed as the object is moved from infinity towards the concave lens? |
| Answer» Solution :The size of the IMAGE INCREASES slightly , through it remains diminished in comparison to the size of THEOBJECT. | |
| 8228. |
A glass prism produces a spectrum when white light passes through it but a glass slab does not do so. Explain. |
| Answer» SOLUTION :In a glass slab, both the refracting faces are parallel. DISPERSION produced by one face is CANCELLED by the other face and hence no SPECTRUM is produced. In prism, the two refracting faces are not parallel to each other and hence, dispersion produced at the two faces gets added up producing a spectrum. | |
| 8229. |
Theory of natural selection : Charles Robert Darwin :: Theory of inheritance of acquired characters : ….. |
| Answer» SOLUTION :JEAN BAPTISTE LAMARCK | |
| 8230. |
Dimensional formula for universal gas constant R is given by |
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Answer» `[ML^(2)T^(-2)K^(-2)]` |
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| 8231. |
Power of a convex lens A of focal length 20 cm is more than that of a lens B of focal length 10 cm. |
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Answer» |
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| 8232. |
How is tidal energy harnessed for producing electricity ? |
| Answer» SOLUTION :TIDAL energy is HARNESSED by CONSTRUCTING a dam across a narrow opening to the sea. A turbine fixed at the opening of the dam converts tidal energy into ELECTRICITY. | |
| 8233. |
SI unit of resistance is |
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Answer» mho |
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| 8234. |
Explain the meaning of the term electromagnetic induction. On what factors do theinduced currentproduced in a circuit depend ? Name and state the rule used to find the directionof induced current . State one practical application of thisphenomenon in everyday life. |
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Answer» Solution :i] Electromagnetic induction produces an induced emf and HENCE an induced CURRENT in a closed circuit by changingthe magnetic field. ii] The VALUE of current induced in a circuitdepends on the rate of change of magnetic field andstrength of the magnetic field. iii] Fleming.sright HAND rule is used to find the direction on induced current. This rule states thatif thethumb, fore finger and middle finger of the right hand are stretched to be perpendicularto each otheras shown in the figure, and if the thumb represents thedirection of the motion of conductor, fore-finger representsdirection of the magnetic field, then the middle finger represents the direction of the induced current. iv] Electric GENERATOR is one practical application of electromagnetic induction. |
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| 8235. |
It takes thousands of years for a wooden basket to disappear. True/ False |
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Answer» |
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| 8236. |
In the HCI molecule, the separation between the nuclei of the two atoms is about 1.27Å (1Å = 10^(-10)m). Find the approximate location of the c.m of the molecule, given that a chlorine atom is about 35.5 times as massive as a hydrogen atom and nearly all the mass of an atom is concentrated in its nucleus ? |
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Answer» SOLUTION :As shown in Fig, suppoise the H nucleus is LOCATED at the origin. Then `x_(1) =0, x_(2) = 1.27 Å, m_(1) =1, m_(2) = 35.5` The position of the CM of HCL molecule is `x= (m_(1)x_(1) + m_(2)x_(2))/(m_(1) + m_(2))` `=(1 xx 0 + 35.5 xx 1.27)/(1 + 35.5) = 1.239Å` Thus the CM ofHCl is located on the line joining H and Cl nuclei at a distance of `1.235 Å` from the H nucleus. 
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| 8237. |
What are the steps will you adopt for better waste management ? |
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Answer» REDUCE the AMOUNT of WASTE formed |
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| 8238. |
Answer questio numbers (a)-(d) on the basis of your understanding of the following paragraph and the related studied concepts: We know that current flowing through a conductor depends upon its resistance and potential difference acrossits ends. The resistance of the conductor depends of (i) its length (ii) its area of cross section and (iii)on the nature of its material. PRecise measurements show that resistance of a uniform metallic conductor is directly proportional to its length (l) and inversely proportional to the area of cross section (A). thus, we can write R=(rho l)/A where p is a constant whose value depends on the material of the conductor. WHo studied the relation between current flowing through a conductor and potential difference across its ends? (b)State the relationship between current, resistance and potential difference in a mathematical form. (c) Name the constant p whose value depends on the material of the conductor and give its SI unit. (d) How does value of p governs your choice of material to be used as live wire for electrical fittings in your house? Name two suitable materials. |
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Answer» Solution :Georg Simon ohm (b) Current (I) =`(Potential difference (V))/(Resistance of conductor (R ))` ( c) The constant p is called the electrical resistivity of the material of given conductor. Its SI Unit is `Omega-m` (ohm-metre). (d) We would prefer to use a material for use as the live WIRE whose resistivity p is as small as POSSIBLE. Two such materials are copper and ALUMINIUM. |
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| 8239. |
The radius of curvature of a spherical mirror is 26cm what is its focal length |
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Answer» SOLUTION :RADIUS of curvature, R`=2XX` Focal length=26cm f=R/2=26/2=13cm |
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| 8240. |
In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students measured the angles of incidence (i), angles of refraction (r) and angles of emergence (e) as shown in the diagrams : The correct measurement is given in the diagram : |
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Answer» A |
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| 8241. |
The eye of the nocturnal birds like owl are having a large cornea and a large pupil. How does it help them ? |
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Answer» Solution :(i) The large pupil open wider and allows the maximum AMOUNT of light to enter the EYE in the dark . (ii) Their lens is large and situated near the retina . This ALSO alloes a lot register on the retina . Retina contains 2 types of light sensing cells rods and cones. (iii) Cones are responsible for coloured vision and require bright , focused light. (iv) Rods are extremely sensitive to light and have a PHOTO sensitive pigment CALLED rhodopsin which plays vital role in night vision. |
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| 8242. |
Does myopia or hypermetropia imply necessarily that the eye has partially lost its ability of accomodation ? If not, what might cause these defects of vision ? |
| Answer» Solution :No, a person may have normal ABILITY of acommodation and yet he may be MYOPIA or hypermetropic. INFACT, myopia may arise when length of eye ball gets elongated and hypermetropia may arise when length of eye ball gets SHORTENED. | |
| 8243. |
Explain the processes of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equations. |
Answer» SOLUTION :AEROBIC RESPIRATION : 
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| 8244. |
The blue colour of sky is due to : |
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Answer» Reflection of LIGHT |
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| 8245. |
Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water? |
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Answer» Solution :DISTANCE between the two BOATS, d = 4.5 KM d=4500m Time, t=3 seconds Speed of sound in the water `=("Distance travelled by sound")/("Time taken")` `=(4500)/(3)` `v=1500ms^(-1)` |
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| 8246. |
(degenerated, red bone marrow, adipose connective tissue, blastocyst, umbilical cord, Differentiation in bones) …………………….of stem cells form can form various tissues in the body. Stem cells are present in the ……………………… by which the foetus is joined to the uterus of the mother. Stem cells are also present in the ....................... stage of embryonic development. Stem cells are present in ....................... and ..................... of adult human beings. It has become possible to produce different types of tissues and the ......................... part of any organ with the help of these stem cells. |
| Answer» SOLUTION :Differentiation of stem cells form can form various tissues in the body. Stem cells are present in the UMBILICAL cord by which the foetus is joined to the uterus of the mother. Stem cells are also present in the blastocyst stage of embryonic development. Stem cells are present in RED bone marrow and adipose connective tissue of adult HUMAN beings. It has become POSSIBLE to produce different types of tissues and the degenerated part of any organ with the help of these stem cells. | |
| 8247. |
Ship A is 10 km due westof ship b . Ship A is heading directly north at a speed of 30 km/h, while ship b is heading in a direction 60^(@)west of north at a speed of 20 km/h .(i)Determine the magnitude of the velocity of ship B relative to ship A .(ii)What will be their distance of closest approach ? |
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Answer» Solution :Velocity of A = 30 KMPH due North`:. V_(A) = 30 hat(j)` Velocity of b = 20 kmph `60^(@)`west of North `:. V_(B) = - 20 SIN 60^(@) + 20 cos 60^(@) = 10 sqrt(3) hat (i) + 10 hat(j)` Velocity of b w.r.t A`= V_(B) - V_(A)` `= - 10 sqrt(3)hat(i) + 10 hat (j) - 30 hat(j) = - 10 sqrt(3)hat (i) - 20 hat(j)` `V_(R) = | V_(B) - V_(A)| = sqrt(100 xx 3 + 400) = 10 sqrt(7)`kmph . Shortest distance : In`Delta LE `ANB shortest distance , AN = AB sin `theta` But distance, AB= 10 KM `:. AN = 10 xx (20)/(10sqrt(7)) = (20)/(sqrt(7)) = 7 . 56 km ` |
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| 8248. |
Consider the following four circuits P, Q, R and S which have been set up to find the resultant resistance of two resistors combined in parallel : The correct way of connecting the ammeter and voltmeter in the circuit is : |
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Answer» P |
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| 8249. |
Stars and sun are non-luminous objects. |
| Answer» SOLUTION :CORRECT STATEMENT- stars and sun are LUMINOUS object. | |
| 8250. |
Assertion (A) : Following are the structural isomers of butane :H-overset("H")overset("|")underset("H")underset("|")(C )-overset("H")overset("|")underset("H")underset("|")(C )-overset("H")overset("|")underset("H")underset("|")(C )-overset("H")overset("|")underset("H")underset("|")(C )-H "" H-overset("H")overset("|")underset("H")underset("|")(C )-overset("H")overset("|")underset(H-underset("H")underset("|")(C )-H)underset("|")(C )-overset("H")overset("|")underset("H")underset("|")(C )-HReason (R ) : Structural isomers have have the same molecular formula but they differ in their structures. |
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Answer» Both (A) and (R ) are TRUE and (R ) is CORRECT explanation of the assertion. |
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