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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.
| 6151. |
Name the three types of wires used in domestic circuitsand mention the colour of theirinsulation. |
| Answer» Solution :LIVE wire- RED insulation, NEUTRAL wire - Black insulation and Earth wire - GREEN insulation. | |
| 6152. |
Diseases endangering social health. |
| Answer» SOLUTION :AIDS, T.B., llepresy and MENTAL DISORDER. | |
| 6153. |
A student performed the experiment of glass slab and with different angles of incidence measured the angles of refraction and emergence in each case. He then recorded his observations as given in the table. The correct observation is : |
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Answer» A |
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| 6154. |
When an object undergoes acceleration |
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Answer» its speed ALWAYS increases |
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| 6155. |
On the basis of the structure of disaster management authority, form the same for yourschool. |
Answer» SOLUTION :
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| 6156. |
State the physical properties of ethyl alcohol ethanol. |
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Answer» SOLUTION :(1) Ethanol is a coloures liquid and it is soluble in WATER in all proporations and has pleasant odour. (2) The boiling point of ethanon is `78^(@)C` and the freezing point is `-114^(@)C.` (3) It is combustible and burns with a blue FLAME. (4) An AQUEOUS solution of ethanol is netrual to litmus paper. |
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| 6157. |
What should be the angle of incidence for a ray of light which suffers minimum deviation of 36^(@) through an equilateral prism ? |
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| 6158. |
The observations made by Swarali value doing the experiment are given below. Based on these write answers to the questions : Swarali found that the light ray travelling from the denser medium to a rarer mediumgoes away from the normal. If the mangle of incidence(i) is raised by Swarali, the angle of refraction ( r ) went on increasing,. However, after certiain value of the angle of incidence, the light ray is seen to return backinto the denser medium. (i) What is the specific value of /_ i called ? (ii) What is the process of reflection of incident ray into a denser medium called ? (iii) Draw the diagrams of three observations made by Swarali. |
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Answer» Solution :(i) CRITICAL angle. (ii) TOTAL internal reflection 
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| 6159. |
A body released at the distance r(r gt R) from the centre of the earth. What is the velocity of the body when it strikes the surface of the earth? |
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Answer» Solution :TOTAL Energy of the body `=KE+PE=0+[-(GMM)/(r^2)]= -(mgR^2)/(r )` Let v be velocity acquired by body on reaching the surface of earth. Total Energy on the surface `=(1)/(2)MV^(2)+[-(mgR^2)/(R )]= (1)/(2)mv^(2)-mgR` According to law of conservatives of energy `(1)/(2)mv^(2)-mgR= (mgR^2)/(r )` `v^(2)= 2gR - (2gR^2)/(r )= 2gR^2[(1)/(R )-(1)/(r )]` `implies v= Rsqrt(2G((1)/(R )-(1)/(r )))`. |
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| 6161. |
How does a battery work ? Explain. |
Answer» Solution :1. A battery consists of two metal plates (electrodes) and a chemical (electronlyte).  2. This electrolyte consists positive and negative ions which move in oppsite DIRECTIONS. 3. This electrolyte exerts a force called chemical force `(F_(c))` to make the ions move in a specified direction. 4. Positive ions move towards one plate and accumulate on that. As result this plate become positively charged (Anode). 5. Negative ions move to another plate and accumulate on that. As a result of this the plate becomes negatively charged (Cathode). 6. This accumulation continues till both plates are suffciently charged. 7. But the ions expertence another force called ELECTRIC force `(F_(e))`, when suffcient number of charges accumulated on the plates. 8. The direction of `F_(e)` is opposite to `F_(c)` and magnitude depends on the amount of charge accumulated on the plates. 9. The accumulation of charges on plates is continuous till `F_(e)` becomes equal to `F_(e)` Now there will not be any motion due to balance of `F_(e)andF_(c).`  10. The NEW battery that we buy from the shop is under the influence of balanced forces. This isthe reason for the constant P.D. between the terminal of a battery. 11. When a conducting WIRE is connected to the terminals of the battery. a P.D. is created between the ends of the conductor which sets up an electric field throughout the conductor. 12. The large number of electrons in the conductor, near the positive terminal of the battery are attracted by it and start to move towards positive terminal. As a results, the amount of positive charge on this plate decrease. So `F_(e)` becomes weaker than `F_(c)andF_(c)` pulls negative ions from anode towards cathode. 13. The negative terminal pushes one electron into the conductor because of stronger repulsion between negative terminal and negative ion. 14. Hence, the total number of electrons in the conductor remains constant during the current flow. The above said process continuous till `F_(e)=F_(c)` |
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| 6162. |
Four point masses each of the value m, are placed at the corner of a square ABCD of side l. The moment of inertia of this system about an axis passing through A parallel to B D is |
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Answer» `3 ml^(2)` `I_(BD) = m(AO)^(2) + m(CO)^(2) = ml^(2)` 
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| 6163. |
What is biomass? Give the composition of a biogas plant. |
| Answer» Solution :Biomass: ANIMAL and plant wastes are CALLED biomass. Blogas is a mixture of methane, hydrogen, CARBON dioxide, and hydrogen sulphide. Methane is the major constituent (75%). | |
| 6164. |
Mass number of a radioactive element is 232 and its atomic number is 90. When this element undergoes certain nuclear reactions, it transforms into an isotopeof lead with a mass number 208 and an atomic number 82. Determine the number of alpha and beta dacay that can occur. |
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Answer» Solution :`""_(90)X^(232) OVERSET(4beta)to ""_(94)Y^(232)+ 4""_(4)E^(0)(4beta "decay")` From the result of `beta` decay, `""_(94)X^(232) overset(6 alpha)to ""_(82)Y^(208)+ 6""_(2)He^(4)(6 alpha "decay")` The number of `alpha` decay = 6 The number of `beta` decay = 4 |
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| 6165. |
When a fuse is rated 8 A, it means |
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Answer» it will not work if current is less than 8 A |
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| 6166. |
If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth's surface would |
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Answer» Solution :`g=(Gm)/(R^2)` if R decreases by 1% it BECOMES `(99)/(100)R` `g'= (GM)/((99R)^2)=1.02(Gm)/(R^2)= (1+0.02)(Gm)/(R^2)` g' increases by `0.02 (Gm)/(R^2)`, therefore increases by 2%. |
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| 6167. |
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. (a)Taking g=10 ms^(-2) ,Calculate : (i)the potential energy possessed by the ball when it is initially at rest. (ii)the kinetic energy of the ball just before it his the ground? (b)What happens to the mechanical energy after the ball his the ground and comes to rest ? |
| Answer» Solution :(a)(i)100 J (II)100 J (b)MECHANICAL ENRGY converts into HEAT and sound enrgy. | |
| 6168. |
While experimentally verifying ohm's law a student observed that pointer of the voltmeter coincide with 15th division when the voltmeter has a least count of 0.05 V. Find the observed reading of voltmeter. |
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Answer» SOLUTION :READING of VOLTMETER = `15xx0.05` = `0.75` VOLT |
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| 6169. |
Briefly explain an activity to plot the magnetic field lines around a straight current carrying conductor. Sketch the field pattern for the same, specifying current and field directions. What happens to the field, (a) if the strength of the current is decreased? (b) if the direction of the current is reversed? |
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Answer» Solution :The pattern of magnetic field lines around a straight conductor carrying current can be described by the following activity. (i) Insert vertically a long straight wire carrying an ELECTRIC current so that it passes through the centre of a horizontal piece of plastic board as shown in figure.  (ii) Take CARE that the plastic board is fixed and does not move up and down. Now, sprinkle some iron filings onto the plastic board to show the shape of the field. (iii) You will notice that the iron filings get arranged round the wires in the shape of circles. This is due to the REASON that the magnetic field lines around the current carrying straight conductor are circular. The iron filings align along these field lines. (iv) On reversing the DIRECTION of flow of current, we observe that the iron filings arrange themselves in circles around the wire showing that the magnetic field lines are still circular in nature. The direction of the magnetic field can be obtained by using a compass. If the current direction is reversed, the direction of the magnetic field is also reversed. (a) When current through the wire is decreased, field also gets reduced. (B) When the current is reversed, field also gets reversed in direction. |
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| 6170. |
A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles are 10 cm long. What effort is needed to cut the sheet ? |
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| 6171. |
Four students A, B, C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below : The correct value for focal length will be obtained by the student : |
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Answer» A |
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| 6172. |
What change would you expect in the characteristic of a musical sound when we increase its frequency one instance and amplitude in another instance? |
| Answer» Solution :When frequency is INCREASED, the pitch of sound increases. When AMPLITUDE is increased, its LOUDNESS increases. | |
| 6173. |
Assertion: ""_2X^(A) undergoes 2 alpha-decay and the daughter product is ""_(z-4)Y^(A-8) Reason: Inalpha-decay the mass number decreases by 4 and atomic number decreases by 2. |
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Answer» If both the ASSERTION and the reason are true and the reason is the CORRECT EXPLANATION of the assertion. |
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| 6174. |
Probosics : Hemichordata : : Suctorial mouth : : ……………. |
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| 6175. |
How is ideal personality cultivated |
| Answer» Solution :Ideal personality can be cultivated by deliberate inculcation of characters LIKE time management,planning ofour own DUTIES and by having DECISION POWER to be socially STRONG. | |
| 6176. |
In Vander Wall's equation (P +(a)/(V^2))(V - b) = RT What are the dimensions of a and b ? Here, P is pressure, V is volume, T is temperature and R is gas constant. |
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Answer» <P> Solution :SINCE dimensionally similar quantities can only be added`THEREFORE [P]=[(a)/(V^(2))]implies[a]=[PV^(2)]=[M^(1)L^(5)T^(-2)]` `[b]=[V]=[L^(3)]` |
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| 6177. |
State various paractical applications of heating effect of electric current in everyday life. |
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Answer» Solution :The heating effect of current is used in ( 1 )the working of ELECTRICAL heating devices such as an ELECTRIC (laundry) iron, electric toaster,electric oven, electric KETTLE and heater, etc. ( 2 )an electric bulb (called incandascent lamp) for producing light by heating its filament. ( 3 )an electric FUSE for protecting HOUSEHOLD Wiring and electrical appliances. |
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| 6178. |
Explain the meaning of following symbols A and B |
Answer» SOLUTION :
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| 6179. |
(a) How can we trace evolutionary realtionsbips ? (b) Define variation in relation to a species. Why is variation beneficial to the species. |
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Answer» Solution :(a) Evolutionary relationships can be traced by STUDYING fossils, by studying homologous and analogous organs, by comparing the EMBRYO or of different animals and by comparing the DNA.s ot dilterent SPECIES. (b) Variation are difterences that occur between the ORGANISMS of same species in spite of the same basic features. Variation in species promotes survival of an organisin m the changing ENVIRONMENT by increasing the adaptability. |
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| 6180. |
Observe the diagram given and answer the question asked. e. The spectacle required for correcting this defect have negative or positive power? |
| Answer» Solution :As CONVEX LENS is used to CORRECT this DEFECT, the power of the spectacle will be positive. | |
| 6181. |
Explain some harmful effects of agricultural practices on the environment. |
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Answer» Solution :(i)Excessive useof fertilisers changes the chemistry of soil and kills useful microbes. (ii)Excessive use of non - BIODEGRADABLE chemical pesticides leadsto biological magnification. (iii)Extensive cropping causes loss of soil fertility. (iv)Damage to natural ECOSYSTEM or habitat. (V)Excessive use of GROUND WATER for argriculture lowers the water table. |
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| 6182. |
Explain each aspect of the disaster management of earthquake. |
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Answer» Solution :The various aspects of disaster MANAGEMENT cycle in reference to an earthquake are as follows: i. Preparation: This aspect deals with a plan to minimize the destruction caused by earthquake. It includes studying earthquake prone REGIONS and ensuring that these regions are well equipped to face the disaster. Also it is ensured that the construction of buildings and other structures are such that they cause least harm to people in case of an earthquake. ii. Redemption:This aspect deals with plant to save maximum lives and minimize the damage to society and country as a whose when the earthquake strikes. iii. Preparedness/ Alertness: The earthquake prone regions are alerted and kept ready such that response is obtained from general publec and administration. iv. Impact of disaster: When the disaster actually strikes, the intensity of various aspects of disaster as well as the disaster management plan ins reviewed. It includes assessment of intensity of the earthquake. V. Response: This factor follows immediately after the disaster strikes and involves quick response to tackle te sitation created by the disastr. Response teams and local authorities try to save maximum lives and provide assistance to VICTIMS of the earthquake. vi. Resurgence: This aspect ensures that national progress is not affected due to the occurence ofdisasters like earthquake. vii. Restoration: This steop involves restoring life and bringing normalcy to the villages and CITIES affected by earthquake. This is important for progress of nation. |
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| 6183. |
What is escape velocity? Explain. (a) What is escape velocity? (b) Derviation of escape velocity. |
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Answer» SOLUTION :The velocity that is needed to go outside the Earth's gravitational force is the escape velocity. To achieve this, the initial velocity of the moving object must be greater than the escape veloc1ty of the earth. (b) Escape velocity on a PLANET can be obtained using following formula: `v_"ESC"=sqrt((2GM)/R)` `V_"esc"=sqrt((2xx6.67xx10^(-11)xx6xx10^24)/(6.4xx10^6))` `=11.18 xx 10^3` m/s = 11.18 km/s Thus, if a spacecraft is to escape the earthgravitational forec travelto the outer space, it must have minimum velocity of 11 .2 km/s |
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| 6184. |
(i) Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory.(ii) Test the gas evolved first with dry and then with wet litmus paper. In which of the two cases, does the litmus paper show change in colour ?(iii) State the reason of exhibiting acidic character by dry HCl gas//HCl solution. |
Answer» Solution :(i) LABELLED diagram for the preparation of HCl gas in the laboratory. (ii) There is no effect on dry litmus paper but wet litmus paper turns red. (III) HCl gas dissolves in water to GIVE `H_3O^(+)` or `H^(+)`. `HCl+H_2OrarrH_3O^(+)+Cl^(-)` Thus, HCl exhibits acidic CHARACTER because of `H_3O^(+)`. |
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| 6186. |
A man uses a crowbar of length 1.5m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of 1 m from his hand. (a) draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their direction. (b) state the kind of lever. (c) Calculate : (i) load arm, (ii) effort arm, (iii) mechanical advantage, and (iv) the effort needed. |
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Answer» (III) 2 (iv) 37.5 kgf. |
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| 6187. |
Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance? |
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Answer» <P> Solution :Given : POWER (P) = 100 W, Current (I)= 3 ATo find : Resistance (R ) FORMULA : `P=VI=(IR)I=I^2 R` Solution : `P=I^2R` `R=P/I^2=100/3^2=100/9` `=11.11 OMEGA` Value of resistance is 11.11 `Omega`. |
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| 6188. |
While performingthe experiment to detemine the focal length of a convex lens by using the sun as the distant object, a student could not find a screen with stand. In the absence of a good screen, which of the following method is the most appropriate and safe to be used by the student ? |
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Answer» He should focus the image of the SUN on his hand |
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| 6189. |
Make a list of voluntary oganizations working for environment conservation and protection. |
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Answer» Solution :i. Bombay Natural History Society , MUMBAI. ii. C.P.R. Environmental Education Centre, Chennai. iii. Gandhi PEACE Foundation ENVIRONMENT CELL, DELHI. iv. Chipko Information Education, Ahmedabad. vi. Kerala State Council for Science, Technology and Environment. vii. Bhartiya Agro Industrial Foundation, Pune. viii. Vikram A Sarabhai Community Science Centre, Ahmedabad. |
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| 6190. |
Draw magnetic field lines around a bar magnet. |
Answer» SOLUTION :
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| 6191. |
A positive charge released from rest |
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Answer» MOVES towards the REGIONS of LOWER POTENTIAL |
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| 6192. |
How can the speed of rotation of the armature coil of an electric motor be increased ? |
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Answer» SOLUTION :The speed of ROTATION of the armaturecoil can be increased by INCREASING : i] the strength of the magnetic FIELD ii] the NUMBER of turns in the coil iii] the current in the coil |
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| 6193. |
The image of object is formed on cornea in human eyes. |
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Answer» SOLUTION :False. Image of OBJECT is formed on retina in HUMAN eyes. |
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| 6194. |
Statement 1 : water is considered as best liquid for quenching thirst. Statement 2 : Water has the highest specific heat capacity of 1 "cal/g"^@ C. Explain Statement 1 with the help of Statement 2 |
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Answer» Solution :1.Water has the highest SPECIFIC heat capacity, hence it can absorb large amount of heat energy, without rising in temperature sufficiently. 2. THIRST is the NATURAL signal of our BODY which occurs when more amount of heat energy is produced than required. 3. Since, water can absorb large amount of heat energy, it is considered as the best LIQUID for quenching thirst. |
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| 6195. |
A man in a lift feels an apparent weight 'W' when the lift is moving up with a uniform dur to gravity . If the same man was in the same lift now moving down with a uniform acceleration that is 1/2 of the accel- eration due to gravity , then what is his apparent weight ? |
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Answer» SOLUTION :Case (i) : When lift is moving upwards : Apparent WEIGHT of the man = W Acceleration , a = `g//3` Apparent weight of the man when the lift is moving upwards is, `W=m(a+g)=m((g)/(3)+g)` `= (4)/(3)mg=(4)/(3)N"" [becauseN=mg` `rArrN=(3)/(4)W` Case (ii) : When lift is moving downwards : Let W ' be the apparent weight of the man Acceleration , a = g / 2 Apparent weight of the man when the lift is moving downwards is , `W'=m(g-a)=m(g-g//2)` `=(1)/(2)mg=(N)/(2) [becauseN = mg] ` `=(1)/(2)((3)/(4)W)=(3)/(8)W` |
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| 6196. |
The sky appears dark to passengers flying at a very high altitude. Why? |
| Answer» SOLUTION :DUE to lack of atmosphere, scattering is not PROMINENT. | |
| 6197. |
Which of the following could not be a unit of acceleration ? |
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Answer» `km//s^(2)` |
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| 6199. |
The incident ray , the refracted ray of light and the normal to the refracting surface all lie in the different plane . |
| Answer» Solution :Correct Statement : The incident RAY ,the refracted ray of LIGHT and the normal to the refracting curface all LIE in the same PLANE. | |