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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.
| 8151. |
Meditation helpsstudents to improve concentration in their studies. |
| Answer» SOLUTION :MEDITATION | |
| 8152. |
Which of the following units is different from others ? |
| Answer» Solution :MeV, KWh and mJ are all units of ENERGY but W is the unit of POWER. | |
| 8153. |
In the circuit diagram given below, three resistors R_(1),R_(2) and R_(3) of 5Omega,10Omega and 20Omega respectively are cooncted as shown. (A) Current through each resistor (B) Total current in the circuit (c )Total resistance in the circuit |
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Answer» Solution :SINCE the resistors are connected in parallel, the potential difference ACROSS each resistor is same (i.e. V=10V) Therefore, the current through `R_(1)` is `I_(1)=(V)/(R_(1))=(10)/(5)=2A` Current through `R_(2)=I_(2)=(V)/(R_(2))=(10)/(10)=1A` Current through `R_(3)=I_(3)=(V)/(R)(10)/(20)=0.5A` (B) Total current in the circuit, `I=I_(1)+I_(2)+I_(3)` `=2+1+0.5=3.5A` (C) Total resistance in the circuit `(1)/(R_(p))=(1)/(R_(1))+(1)/(R_(2))+(1)/(R_(3))` `=(1)/(5)+(1)/(10)+(1)/(20)` `=(4+2+1)/(20)` `(1)/(R_(p))=(7)/(20)` Hence, `R_(p)=(20)/(7)=2.857Omega` |
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| 8154. |
On entering in a medium from air, the speed of light becomes half of its value in air. Find the refractive index of that medium with respect to air. |
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Answer» SOLUTION :Here speed of ligh in medium `upsilon = (1)/(2)XX` speed of light in air `=(C )/(2)` `therefore` REFRACTIVE index of medium w.r.t. air, `n=(c )/(upsilon)=(c )/((c//2))=2` |
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| 8155. |
Which colourshowsmaximumdeviationwhenlightis dispersedthrough parism ? |
| Answer» Answer :A | |
| 8156. |
Explain giving example where active involvement of local people lead to efficient management of forest. |
| Answer» Solution :In WestBengal , the Sal FORESTS had been very badly DEGRADED , Aforest officer involved villagers in protection of Sal forest and gave them EMPLOYMENT in silviculture and harvesting operations. Villagers were allowed to collect firewood and fodder on a nominal PAYMENT . Within a period of 10 years the previously worthless forests became valuable. | |
| 8157. |
Which of the following is nota form of ocean energy |
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Answer» GEOTHERMAL ENERGY |
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| 8158. |
The upward pressure acting on a body immersed in water is known as …………….. |
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Answer» tension |
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| 8159. |
Name the type of current: (i) Used in household supply (ii) Given by a cell. |
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Answer» SOLUTION :(i) ALTERNATING CURRENT (II) DIRECT current. |
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| 8160. |
State the transformation of energy taking place in a solar cell panel. |
| Answer» SOLUTION :`"SOLAR ENERGY" RARR" ELECTRICAL energy"` | |
| 8161. |
Does a stationary charge has magnetic field around it ? |
| Answer» SOLUTION :No. There is no magnetic FIELD around a stationary CHARGED PARTICLE. | |
| 8162. |
Which different aspects of disaster management would you check for your school? Why? |
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Answer» Solution :The various aspects of disaster MANAGEMENT whilch I would check for my school are as follows: i. Emergency exist for easy evacuation during DISASTERS like fire accident etc. ii. Presence of functional fire EXTINGUISHER at appropriate places and training everyone about the usage of fire extinguishres so that number fo casualities can be reducedduring fire accident. iii. Provision of FIRST aid training to teachers and other staff of the school as WELL as students so sthat everyone is well prepared to face the disaster. iv. Conduction of mock drills for various disasters so that everyone is aware of the steps to be taken for disaster redressal. |
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| 8163. |
Match the following. {:("1. Kinetics",-,"(a) Causes the motion"),("2. Kinematics",-,"(b) Inequilibrium"),("3. Balanced force",-,"(c ) Motion of bodies without cause"),("4. Unbalanced force",-,"(d) Motion of bodies with cause"):} |
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Answer» SOLUTION :1. (d) MOTION of bodies with cause 2. (c ) Motion of bodies WITHOUT cause 3. (b) Inequilibrium 4. (a) Causes the motion |
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| 8165. |
Which problems does the common man face due to incidences of cybercrime? |
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Answer» Solution :The number oif Aadhar card,PAN card, credit or debit card are obtained by the cheaters. This is cybercrime.The PIN number can be missued and the money can be withdrew from the bank accounts. The looters withdrew cash from our accounts in this way. (2) People can be cheated during ONLINE shopping. (3) Fake account on Facebook is opened and false information is displayed on it. Through such accounts the girls are emotionally and financially exploited (4) Electronic media are misued for sending derogatory and vulgar messages. obscene pictures and PROVOCATIVE statement. (5) Through the internet hackers an send virus to crash someone's computers or even mobile phones.In all such different ways, common people can be VICTIMIZED by cybercrime . |
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| 8166. |
Which are the types of consumers ? What are the criteria for their classification? |
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Answer» Solution :a. The DIFFERENCE TYPES of consumers are `:` 1. Primary consumers ( Herbivores ) 2. Secondary consumers ( Carnivores ) 3. Tertiary and `//` or apex consumers 4. OMNIVORES ( Mixed consumers ) b. The criteria for the classification of consumers are mode of nutrition, FOOD requirements, etc. |
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| 8167. |
If a person can't see the object that is placed at a distance less than 50 cm, then what type of defect he is suffering from? Also tell the nature of lens and calculate the power of the lens so that he can clearly see the object that is placed at 25 cm from the eye. |
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Answer» SOLUTION :Defect from which the PERSON suffering=Long sightedness Given VALUE of u=-25cm Value of v=-50cm Use the lens formula (1/v)+(1/u)=1/f Put the VALUES of u and v in the above given formula (1/-50)+(1/-25)=1/f f=50cm =5m Power of lens=2D To correct this defect, convex lens with power 2D is required to be used. |
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| 8168. |
proton-Proton chain reaction is an example of ________________. |
| Answer» Solution :Nuclear fusion | |
| 8169. |
Give Scientific reasons . Tungsten metal is used to make a solenoid type coil in an electric bulb. · |
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Answer» Solution :1.The filament in an electric bulb is made of Tungsten. 2. Out of all metals, tungsten has the highest melting point (`3422^@C`),lowest VAPOUR pressure and highest TENSILE strength which makes it ideal for use in a Light Bulb. 3. When electric current GOES through the tungsten filament, the filament GETS heated and emits light without melting it. Hence, it is used to make SOLENOID type coil in an electric bulb. |
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| 8170. |
A concave lens is used to correctthe defect of __________ |
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Answer» Solution :(i) In MYOPIA, the curvature of the cornea and eye lens increases. Due to this, converging power of lens remains large. (ii) ALSO the eyeball elongates so that the distance between the lens and retina increases. (iii) A concave lens of suitable focal length can create required divergence, hence, after convergence by eve lens sharp image of the distant OBJECT is FORMED on the retina and the defect is be CORRECTED |
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| 8171. |
Natural uranium consists of _______ % of U^(235) and ______ % of U^(238). |
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Answer» 99.72 % of U-238 |
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| 8172. |
Draw the V-I graph for ohmic and non-ohmic conductors. |
Answer» SOLUTION :GRAPHS for OHMIC and non-Ohmic CONDUCTORS: 
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| 8173. |
Name any two energy sources that you would consider to be renewable. Give reasons for your choice. |
| Answer» SOLUTION :HYDEL POWER, as water is replenished by water cycle. Wind power, as wind keeps blowing DUE to UNEVEN heating of earth by the sun. | |
| 8174. |
Have you seen a mirage which is an illusion of the appearance of water on a hot road or ion a desert ? |
| Answer» Solution :YES. I have seen mirage on hot ROAD during SUMMER days. | |
| 8175. |
The non-renewable energy source among the following is |
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Answer» COAL energy |
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| 8176. |
A copper sphere of 100 g mass is beated to raise its temperature to 100^@C g mass is heated to raise its temperature to 100^@C and is released in water of mass 195 g and teperature 20^@C in a copper calorimeter. If the mass of clorimeter is 50 g. what will be the maximum temperature of water? (Give : specific heat of copper = 0.1 cal // g^@C and specific heat of calrimeter =0.1 " cal / g "^@C |
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Answer» Solution :LET copper sphere, water and calorimeter attain final temperature `T^@C` We have,  Heat lost by copper sphere `Q=m_("sphere")xx C_("sphere")xx Delta T` `100 xx 0.1 xx (100-T)` Heat gained by water in calorimeter. `Q_1=m_("water")xxC_("water")xx Delta T` `=195 xx 1 xx (T-20)` Heat gained by calorimeter `Q_2=m_("calorimeter")xxC_("calorimeter")xx Delta T`. `= 50 xx 0.1xx (T -20)` According to princilple of heat exchange. `Q=Q_1+Q_2` `therefore10xx(100-T)=195 xx (T-20)+5 xx (T-20)` `therefore1000-10T=200(T-20)` `therefore 210 T= 5000` `therefore T =23.8^@C` |
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| 8178. |
What type of lens is used for correcting hypernetropia? |
| Answer» SOLUTION :CONVERGING or CONVEX LENS | |
| 8179. |
Which types of telescopes are orbiting around the Earth? Why is it necessary to put them in space? |
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Answer» Solution :1.Optical X-ray and radio telescopes are orbiting around the earth. 2. These telescopes help us to study the space and the sources of VARIOUS raditions from space. 3. Earth based telescopes present some PROBLEMS in making GOOD quality observations due to various DISTURBANCES with atmosphere. 4. These problems do not exist in the space and the image obtained by space telescopes would be bright and very clear and will remain at one place. 5. Therefore, it is necessary to put them in space. |
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| 8180. |
When an iron rod is dipped into a solution of copper sulphate, copper is displaced. Why is it so ? |
| Answer» SOLUTION :When an iron ROD is dipped into a solution of COPPER sulphate, copper is DISPLACED because iron is more reactive than copper. So, it displaces copper and forms iron sulphate. | |
| 8181. |
(i) What is meant by 'least distance of distinct vision'? (ii) How does iris controls the size of the pupil in bright light and dim light? |
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Answer» Solution :(i) The MINIMUM distance at which objects can be SEEN most distinctly without strain is called the least distance of distinct VISION. (ii) In BRIGHT light, the iris contracts the pupil to allow less light to enter the eye. In dim light, the iris expands the pupil to allow more light to enter the eye. |
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| 8182. |
It is important to make check dams across the flooded gullies because they (i) hold water for irrigation (ii) hold water and prevent soil erosion (iii) recharge ground water (iv) hold water permanently |
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Answer» (i) and (iv) |
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| 8183. |
How can we get the required amount of energy by connecting solar panels? |
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Answer» Solution :(1) The photovoltaic solar CELLS can be connected in a series or in parallel to make a solar panel. (2) When solar cells are connected in a series, the potential DIFFERENCE of individual cells are added in the combination, HOWEVER the currents from individual cells are not added. (3) When solar cells are connected in parallel, the currents of the individual cells are added in the combination, but the potential differences from individual cells are not added. ( 4) Through such connections the required potential difference and current can be obtained. (5) Many such solar panels are connected in series and in parallel to generate required current and potential difference. (6) When many solar panels connected in series they form a solar string. Many solar strings connected in parallel make a solar array. In such manner we can get the required amount of ENERGY by connecting solar panels. |
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| 8184. |
What are the factors that affect the speed of sound in gases? |
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Answer» Solution :Effect of density: The velocity of sound in a gas is inversely proportional to the square root of the density of the gas. HENCE, the velocity DECREASES as the density of the gas increases. `v prop sqrt(1/d)` Effect of temperature: (i)The velocity of sound in a gas is directly proportional to the square root of its temperature. (ii)The velocity of sound in a gas increases with the increase in temperature `v prop sqrtT`Velocity at temperature Tis given by the following equation : `v_T=(v_0+0.61 T)ms^(-1)` Here , `v_0` is the velocity of sound in the gas at `0^@C`. For air `v_0= 331ms^(-1)`. Hence, the velocity of sound CHANGES by 0.61 `ms^(-1)` when the temperature changes by one degree CELSIUS. Effect of relative humidity: When humidity increases the speed of sound increase That is why we can hear sound from long DISTANCE clearly during rainy seasons |
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| 8185. |
a) Explain the terms : i) Speciation ii) Natural selection b) List four factors which could lead to speciation. |
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Answer» Solution :a) i) Speciation : Speciation is the evolution of reproduction isolation among once interbreeding population i.e, the development of one or more SPECIES from an EXISTING species. ii) Natural selection : Natural relationship in the process, according to Darwin, which bring about the evolution of new species of animals and parents. b) Four factors which can LEAD to speciation are : Genetic drift : Over generation, genetic drift MAY accumulate which lead to speciation. Natural selection : Natural selection which may give rise to speciation. Severe DNA change A variation may occur which does not ALLOW sexual act between two groups. |
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| 8186. |
One kcal heat : |
| Answer» Solution :The amount of HEAT necessary to raise the temperature of 1 kg of water by `1^@C` from `14.5^@C` to `15 .5^@C` is CALLED on kcal heat | |
| 8187. |
Explain what is the difference between a direct current and an alternating current. Write one important advantage of using alternating current. |
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Answer» Solution :The current whose DIRECTION gets reversed after every half cycle is called an ALTERNATING current or AC. There is no change in the direction of DC. The most important ADVANTAGE of using AC over DC is that in the AC mode electric power can be TRANSMITTED over long distances with less LOSS of power. |
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| 8188. |
What is the force on a current-carrying wire that is parallel to a magnetic field ? Give reason for your answer. |
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Answer» |
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| 8189. |
A visually challenged student, has to perform a lab test to detect the presence of acid in a given solution. The acid-base indicator preferred by him will be : |
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Answer» BLUE litmus. |
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| 8190. |
(a) Draw a diagram to show the refraction of light through a glass prism. On this diagram, mark (i) incident ray (ii) emergent ray, and (iii) angle of deviation. (b) What is a rainbow ? What are the two conditions necessary for the formation of a rainbow in the sky ? (c) What acts as tiny prisms in the formation of a rainbow ? (d) Name the process which is involved in the formation of a rainbow. (e) What are the seven colours seen in a rainbow ? |
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| 8191. |
At the time of short circuit, the current in the circuit |
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Answer» REDUCES substantially. |
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| 8192. |
Complete the chart per the objective of the first aid: |
Answer» SOLUTION :
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| 8193. |
A person may suffer from both myopia and hypermetropia defects. (a) What is this condition called ? (b) When does it happen ? (c) Name the type of lens often required by the person suffering from this defect draw labelled diagram of such lenses. |
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Answer» Solution :(a) This condition is CALLED .presbyopia.. (B) It arises due to the gradual weakening of the CILIARY muscles and diminishing flexibility of the eye lens on account of age. (c) The person concerned requires bifocal lenses, concave (diverging) lens for correction of MYOPIA and CONVEX (converging) lens for correction of hypermetropia. Labelled diagrams of such lenses are given below : 
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| 8194. |
What are coral reefs ? |
| Answer» Solution :CORAL REEFS are colonies of SPECIFIC COELENTERATES or Cnidarians. | |
| 8195. |
IF a person have five resistors each of value 1/5 Omega then the maximum resistance he can obtained by connecting them is |
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Answer» `1 OMEGA` `R_(equival ent)=5R=5 times 1/5=1 Omega` |
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| 8196. |
An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image. |
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Answer» SOLUTION :u=-20cm, f=15cm `1/f=1/u+1/v` `1/v=1/15-1/(-20)` `1/v=1/15+1/20=7/60` `v=8.57` CM Nature of the IMAGE : Virtual. |
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| 8197. |
Green revolution refers to |
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Answer» Solution :(1) In agriculture, different METHODS used to harvest maximum yield from minimum land, these methods are collectively called green revolution. (2) Dr. M.S. Swaminathan is called father of Green Revolution in India while Dr. Norman Borlaug has done the similar EFFORTS in U.S. (3)Before Green Revolution in India, there was always the dearth of the food grains. The overflowing Indian population was BADLY affected due to poor quality and quantity of food. (4) But due to Green Revolution, in India attention was focused on the agriculatural research. (5) Improvised dwarf varieties of wheat and rice, proper use of fertilizers and pesticides and water management were the proper methods that increased production of food grains. (6) This created ABUNDANCE of the grains for Indian population. |
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| 8199. |
Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3^@C and B by 5^@C. Which object has more specific heat? And by what factor? |
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Answer» Heat absorbed by object `B(Q_B)= m_B c_B Delta T_B` Given `Q_A = Q_B " and "m_A=m_B =1 g.` Also, `DeltaT_A = 3^@C " and "Delta T_B= 5^QC` `therefore c_A Delta T_A = c_B Delta T_B` `therefore3c_A = 5c_B` ` thereforec_A = 5/3 c_B` |
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| 8200. |
A current of 1A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16s would be roughly? |
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Answer» `10^20` |
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