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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.
| 151. |
The C.G.S unit of couple is _______ |
| Answer» SOLUTION :dynecm | |
| 152. |
What is wet land ? |
| Answer» Solution :LOW LYING areas covered with shallow waters are CALLED wetland. | |
| 153. |
State the laws of refraction of light. Explain the term 'Absolute refractive index of a medium' and write an expression to relate it with the speed of light in vacuum. |
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Answer» Solution :Law 1 : The incident ray, the refracted ray and the normal at the POINT of incidence, at the interface of the two transparent media, all lie in the same plane. Law 2 : The ratio of SINE of angle of incidence (sin i) to the sine of angle of refraction (sin r) is a constant, for the light of a given colour and for the given pair of media. This true for angle `0 lt i lt 90^(@)`. `(sin i)/(sin r)=` constant `= MU` This constant value `mu` is called the REFRACTIVE index of the medium. Let a ray of light travel from air to a material medium. Let Speed of light in air = c Speed of light in medium = v Refractive index of medium with respect to air `= mu =("speed of light in air")/("speed of light in medium")=(c )/(v)` This is called the Absolute refractive index of medium. |
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| 154. |
Refractive index of glass with respect to water is (9)/(8). The refractive index of water with resptect to glass is _______________. |
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| 155. |
Name the two basic events in evolution. |
| Answer» Solution :NATURAL selection and Variationsare the two BASIC EVENTS in EVOLUTION. | |
| 156. |
What is the function of receptors in our body? think of situations where receptors do not work properly what problems are likely to arise ? |
| Answer» Solution :Receptors are SPECIALISED called tissues, organ game and nerve ENDING which are able to pick up specific stimuli e.g GUSTATORY receptors help in detecting taste and OLFACTORY receptors help in sensing smell receptors provide sensory input about external and internal ENVIRONMENT. Without them an animal will not be able to observe handle and taste food. it will not beaware of an approaching enemy. The animal may not be able to correct its positions and will fall down repeatedly. Therefore animal will not be able to perform the normal activities connected with the defective receptors. | |
| 157. |
We can develop new plants from the leaves of Bryophyllum. Comment |
| Answer» Solution :The leaf notches of BRYOPHYLLUM have ADVENTITIOUS buds which GROW into a COMPLETE new plant when it falls on soil. | |
| 158. |
StateNewton's laws of motion . |
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Answer» Solution :3 Physical law describesthe RELATIONSHIP between a body and the forces . (i) Newton's First law : Every body continuesto be in itsstate of restor the stateof uniform MOTION along a straight line unless it is acted upon by some EXTERNAL force. (II) Newton's second lawofmotion : The force actingona body is directly proportionalto the rate of changeof LINEARMOMENTUM of the body and the changein momentum takes place in the direction of force . This law helps us to measurethe amount of force. So it is calledas "law of force " . (iii) Newton's third law of motion : For every action there is an equal and opposite reaction . They always act on two differentbodies . |
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| 159. |
How can three resistor of resistances 2 Omega, 3 Omegaand 6 Omegabe connected to give a total resistance of 4 Omega |
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Answer» Solution : In order to obtain a total resistance of `4 Omega` from three resistors of `2 Omega, 3Omega and 6 Omega… to` First connect the two resistors of `3Omega and 6 Omega` in PARALLEL to get a total resistance of `2Omega`. This is because in parallel combination, `1/R_p = 1/R_1 + 1/R_2` `R_p=(R_1 R_2)/(R_1 +R_2)` `= (3 xx 6)/(3 + 6)` `=2 Omega`  Now, above parallel combination of `3Omega and 6 Omega` resistors is connected in series with the resmaining `2 Omega`resistor to get total resistance of `4 Omega`. This is because in series combination. `R_s =R_p +R_3` `=2 + 2` `= 4Omega` HENCE, the ARRANGEMENT of three resistors `2Omega, 3Omega and 6 Omega` which gives total resistance `4 Omega` can be represented as FOLLOWS : 
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| 160. |
How can three resistor of resistances 2 Omega, 3 Omegaand 6 Omegabe connected to give a total resistance of 1 Omega ? |
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Answer» Solution : In order to OBTAIN a total resistance of `1Omega` from three resistor of `2Omega, 3 Omega and 6 Omega`, all the three resistors should be comnected inparallel.This is because in a parallel COMBINATION, `1/R_p = 1/R_1 +1/R_2 + 1/R_3` `=1/2 + 1/3 +1/6` `= (3 + 2 +1)/6` `= 6/6` `=1` `:. R_p =1 Omega` Hence, the ARRANGEMENT of three resistors `2Omega, 3Omega and 4 Omega` which gives total resistance `1 Omega` can be represented as follows : 
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| 162. |
Describe the role prostate gland, seminal vesicle and testes in the human male reproductive system. |
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Answer» Solution :Role of Prostate gland and Seminal vesicle : (a) Their secretions PROVIDE fluid medium for easy movent of SPERM. (b)This medium ALSO provides right environment so that sperms do not die. (c ) It provides them with nutrition. Role of Testes : (a) Testes produce male gametes, which participate in sexual REPRODUCTION. (b) They also produce testosterone which is the male hormone, responsible for development of secondary sexual characters in males like MUSCULATURE, hoarseness of voice, body and facial hair etc. |
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| 163. |
Two charges are placed at certain distance apart. A metallic sheet is placed between them. What will happen to the force between the charges? |
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Answer» Increases |
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| 164. |
What is atmospheric refraction ? Use this phenomenon to explain the following natural events: (a) Twinkling of stars, (b) Advanced sunrise and delayed sunset. Draw diagrams to illustrate your answer. |
| Answer» SOLUTION :For atmospheric refraction, see SHORT Answer Question NUMBER 16. (a) See NCERT TEXTBOOK Exercise Question Number 10. (b)See Short Answer Question Number 17. | |
| 165. |
Signal from a remote control to the device operated by it travels with the speed of |
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Answer» light |
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| 166. |
Write the physiological effects of gibberellins. |
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Answer» Solution :(i) Physiological effects of gibberellins (1) Gibberellins promote the production of male flowers in monoecious plants (Cucurbits). (2) Gibberellins break dormancy of potato tubers. (3) Gibberellins are efficient in inducing the formation of seedless fruit (Parthenocarpic fruits). (4) Gibberellins STIMULATE extraordinary elongation of internode Eg. Corn and pea. (ii) An enzyme, Hyaluronidase present in the acrosome help the sperm to enter the OVUM during fertilization. (III) Deforestation is the destruction of large area of forests. It gives rise to ecological problems like floods, drought, soil erosion, loss of wild life, extinction of SPECIES, imbalance of biogeochemical cycles, alteration of climatic conditions and deserification. Therefore it is a threat to the economy quality of life and future of the environment. |
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| 167. |
List two causes of Hypermetropia.(b) Draw ray diagrams showing (i) a hypermetropic eye and (ii) its correction using suitable optical device. |
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Answer» Solution :(i) FOCAL length of eye lens is too large, and (ii) Eye ball is contracted. (b) (i) A hypermetropic eye is shown here. For an object SITUATED at least distance of distinct vision, image is formed behind the retina. (ii) CORRECTION of hypermetropia using a suitable convex lens is shown here. 
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| 168. |
List two forms of energy in which solar energy manifests itself in oceans. |
| Answer» SOLUTION :TIDAL ENERGY and Sea-wave energy. | |
| 169. |
Two electric irons working on 230 V AC. The resistance passed by one is 800W and by the second is 1200W. If so Which electric iron posses more intensity of current? |
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| 170. |
Two electric irons working on 230 V AC. The resistance passed by one is 800W and by the second is 1200W. If so Which one posses more power consumption? |
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| 171. |
There is increasing competition to upload the videos of road accidents instead of helping the victims.what is the mentality of such people? |
| Answer» Solution :Many a times there are ACCIDENTS on the road.It may cost the life too.But due to lack of humanity in the minds of people, theyfeel talking picture more important than rushing to rescue the victim,Probably the proper values are not instilled inn the young minds of CHILDREN this can results in such callous attitudes, The virtual wars and virtual accidents in the computer or mobile games occupy the minds ot such an extant, that the people forget about present situations.They are also not aware that the victim needs support and IMMEDIATE medical help in order to save his/her life. SINCE there are more'like'for such pictures in the social media,people keep on shooting the videos or clicking the pictures.Also now days, the cell phones with cameras are very common and almost everyday has it. Thus there is a competition to shoot such pervese pictures. | |
| 172. |
Beta rays travels with the speed of light. |
| Answer» SOLUTION :GAMMA rays TRAVELS with the SPEED of light. | |
| 173. |
The sky appears to be silvery white when viewed from a space craft situated at a height of 1000 km above the earth. |
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| 174. |
In Q 63 above , if the elevator moves upward with a constant acceleration , the apparent weight of the person is |
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Answer» less than his true weight This weight acts on the weighing machine which offers a reaction R, given by the reading of the weighing machine. (i)When the elevator is at rest or moving with uniform velocity , UPWARDS or DOWNWARDS , apparent weight R = mg , which is the actual weight . (ii)When the elevator is accelerating downwards with acceleration a , we have mg - R =ma or R= m(g-a) In this case , apparent weight becomes less. (iii) When the elevator is accelerating upwards with acceleration a , we have R- mg=ma or R=m(g+a) In this case , apparent weight becomes more . (iv)If a=g,R=m(g-g)=0 So , the apparent weight of a person in an elevator falling down freely with an acceleration (=g) is zero . |
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| 175. |
What are synthetic auxins? Give examples. |
| Answer» Solution :Artificially SYNTHESIZED AUXINS, that have the properties LIKE auxins are called as synthetic auxins. Eg. 2,4-D (2,4-Dichlorophenoxy ACETIC acid) | |
| 176. |
The moment of a force of 5N about a point P is 2 Nm. Calculate the distance of point of application of the force from the point P. |
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Answer» Solution :GIVEN MOMENT of force =2 NM, F=5n If the distance of the point of application of from the point P is r metre, then Moment of force = force `times` distance or `2=5 times r` `therefore r=2/5 =0.4m` |
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| 177. |
When was India's first critical nuclear reaction carried out? |
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Answer» DECEMBER, 1941 |
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| 178. |
In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.(i) Name the phenomenon.(ii) State the colours seen at X and Y.(iii) Why do different colours of white light bend at different angles through a prism ? |
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Answer» Solution :(i) It is dispersion of light. (ii) X - Violet COLOUR, Y - Red colour (iii) As light of DIFFERENT COLOURS travels with different speed inside the prism, hence different colours BEND at different angles. |
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| 179. |
Which part of the eye generates electric signals ? |
| Answer» Solution :LIGHT -SENSITIVE cells-rods and CONES- PRESENT in the retina. | |
| 180. |
What are saturated and unsaturated hydrocarbon? Write the structure of the simplest hydrocarbon ? |
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Answer» SOLUTION :The HYDROCARBON in which valency of carbon is saturated hydrocarbon. The valencies of all the atoms are satisifed by double or TRIPLE bonds between them are called UNSATURATED hydrocarbon. The simplest hydrocarbon is methane. `H-underset(H)underset(|)overset(H)overset(|)C- H` |
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| 181. |
A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 12 cm. Which of the following object distance should be chosen for this purpose? |
| Answer» ANSWER :A | |
| 182. |
Fluorine is the most reactive among the halogens. |
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Answer» SOLUTION :(1) FLUORINE has the electronic configuration (2, 7). (2) It requires only one electron to COMPLETE the octet. (3) The atomic SIZE of flourine is the smallest among the halogens. Hence, the nuclear attraction on the outermost electrons is maximum. Hence, fluorine is the most reactive among the halogens. |
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| 183. |
A wire of resistance R is cut into five equal parts. These parts are then connected in panllel If the equivalent resistance of this combination is R'. Calculate the ratio R/R'. Draw a clrcuit diagram to show two resoton R_(1) and R_(2) connected In parallel along with a battery, by, ammeter and voltmeter. |
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Answer» Solution :RESISTANCE of each PART = R/5 When connected in parallel : `(1)/(R) = (5)/(R)+(5)/(R) +(5)/(R)+(5)/(R) +(5)/(R) = (25)/(R)` `:. (R)/(R) = 25 ` 
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| 184. |
Saturated hydrocarbons and Unsaturated hydrocarbons . |
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| 185. |
An object is in unifrommotion along a straight line . What will be position-time graph for themotion of the object if (a)x_(0_=+ve, v=+ ve (b) x_(0) =+ ve, v =- ve (c ) x_(0) =- ve, v= + ve and (d) both x_(0) and v are negative ? The lettersx_(0) and v position of theobject at time t=0 and v represent posituion of the object at time t=0 and uniform velocity of theobject respectively. |
Answer» SOLUTION :
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| 186. |
Derive an expression for the work done in an isothermal process. |
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| 187. |
On which form of energy a glider depends upon for flying ? |
| Answer» SOLUTION :KINETIC ENERGY, WIND energy. | |
| 188. |
Direction of conventional current is from :___________ |
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Answer» Negative terminal to POSITIVE terminal |
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| 189. |
Assertion: In a simple battery circuit the point of highest potential is positive terminal of the battery. Reason: The current flows towars the point of the highest potential. |
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Answer» If both the ASSERTION and REASON are TRUE and the reason is the correct explanation of the assertion. |
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| 190. |
Draw the vertical section of the human eye and label the following parts: (a) Lens (b) Fovea |
Answer» SOLUTION :
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| 192. |
An element belongs to 3^(rd) period and group 17 of the modern periodic table, find out: (a) The number of valence electrons and valency (b) Lewis structure of its compound with hydrogen (c) Electronic configuration of this element |
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Answer» Solution :(a) No. of valence electrons - SEVEN (7), Valency - 1 (b) Formula with HYDROGEN - HCl  (C) 2, 8, 7 |
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| 193. |
Which precautions will you take during spraying ofpesticides? |
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Answer» Solution :(1) PESTICIDES are toxic chemicals. By using them indiscriminately, they CONTAMINATE the water, soil and also crops. (2) The D.D.T., CHLOROPYRIPHOS and malathion are very dangerous. They spread through the food chain causing biomagnification. (3) Therefore, we shall not use such insecticides and pesticides. We shall use organic pesiticides. (4) At the TIME of spraying, nose, eyes and skin will be covered and protected. (5) Care will be taken not to allow children or domestic animals to come in contact with a pesticide. (6) Excessive use will not be done. |
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| 194. |
How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery? |
Answer» SOLUTION :The experimental set up COMPRISES three RESISTORS `R_(1),R_(2),andR_(3)` of three different values such as `1Omega,2Omegaand3Omega` which are CONNECTED in series. Connected them with a battery of 6 V, an ammeter and plug key, as shown in figure.  The key K is closed, and the ammeter reading is recorded. Now, the position of ammeter is changes to anywhere in between the resistors and the ammeter reading is recorded each time. It.s observed that there was identical reading each time, which shows that some current flows through every part of the circuit containing three resistances in series connected to a battery. |
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| 195. |
How are cancave and convex mirrors constructed ? |
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Answer» Solution :a. Concave mirror is fonned when a hollow glass sphere is CUT into parts and the OUTER SURFACE of the cut part is painted causing the inner surface to work as the REFLECTING surface. B. Convex mirror is fonned when a hollow glass sphere is cut into parts and the inner surface of the cut part is painted causing the outer surface to work as the reflecting surface. |
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| 196. |
Explain the use of concave lenses in the following: Microscopes |
| Answer» SOLUTION :( e) Camera, telescope and MICROSCOPE - These instruments mainly use convex lenses. To get GOOD quality image a concave LENS is used in front of the eyepiece or INSIDE it. | |
| 197. |
A monochromatic ray of light passes from air to glass. The wavelength of light in air is lamda, the speed of light in air is c and in glass is V. if the refractive index of glass is 1*5, write down (a) the relationship between c and V, (b) the wavelength of light in glass. |
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| 198. |
Draw schematic of power plant based on natural gas and answer the following questions : i. At which place natural gas power plant is situated in Maharashtra ? ii. How is pollution reduced in natural gas based power plant ? iii. Give two examples of eco-friendly electricity process. |
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Answer» Solution :i. Natural gas power plant is situated in Anjavel in Maharashtra. II. As natural gas does not contain SULPHUR BURNINGOF natural gas results in LESS POLLUTION. iii. Electricitygeneration from wind and sunlight are two examples of eco-friendly electricity process. |
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| 199. |
As the height of the object from the surface of the Earth increases, value of g becomes_________. |
| Answer» Solution :less | |
| 200. |
What part of our body vibrates when we speak? |
| Answer» SOLUTION :When we speak, VOCAL cord VIBRATES in our BODY. | |