InterviewSolution
Saved Bookmarks
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.
| 9151. |
Focal length of a convex lens is 25 cm. Its power is |
|
Answer» `+4` D `THEREFORE` POWER of convex lens `P = (1)/(f) = (1)/((+0.25 m)) = +4 D` |
|
| 9152. |
In case of a projectile motion, what is the angle between the velocity and acceleration at the highest point? |
| Answer» SOLUTION :`90^(@)` | |
| 9153. |
Discuss the main feature of a domestic wiring systemwith the helpof a schematic diagram of one of the common domestic circuits . |
Answer» Solution : (1)In our homes , we receive SUPPLYOF electricpowerthrough a MAIN SUPPLY (also called mains), eithersupported through overhead electricpoles or byunderground cables . (2) This supply is through the live/ positivewire (red insulation cover ) , neutral / negative wire(black insulation cover) and theearth wire (green insulatio cover). (3) The potential difference betweenthe livewireand neutral wire is 220 V andthe frequency of AC is 50Hz. (4) At the meter -board in the house , thesethree wires pass into an electricitymeter through a main fuse . (5) Through themainswitch theyare connected to thelinewires in the house . (6) These wires supply electricity to separatecircuits within the house . (7) OFTEN, two separatecircuits are used ,one of currentrating 15A forapplicances with higherpoweratings suchas geysers, air coolers , etc and the other of currentrating 5A for bulbs , fans ,radio etc. (8) Theearth wireis usually connected to a metal plate deep in the earth near the houseas local earthing . (9) Inside the house ,in eachseparate circuit,differentappliances are connected across the liveand neutral wire. Eachappliancehas a separate.ON./.OFF. switch to complete the circuit or to discontinue te currentin thecircuit . (10) In orderthat , each appliancehas equal potential difference, all appliances are connected in parallel across the supply. [Note: See Chapter 12 for advantages of a parallel connection]. |
|
| 9154. |
Specific Heat Capacity : |
| Answer» Solution :The amount of heat energy REQUIRED to raise the temperature , of a UNIT MASS of an object by `1^@C` is called the specific heat of that object. | |
| 9155. |
How does an astronaut floatin a spaceshuttle ? |
| Answer» Solution :An ASTRONAUT float in a space shuttle because both are in the state of weightlessness, bom EXPERIENCING equal ACCELERATION towards EARTH as free fall bodies. Astronauts are not floating but falling freely. | |
| 9156. |
A light ray passes from water to (i) air, and (ii) glass. In each case, state how does the speed of light change. |
|
Answer» (II) The speed of light DECREASES. |
|
| 9157. |
The calorific value of hydrogen is 1,50,000 Kj//Kg and that of LPG is 55,000 KJ//Kg. What is the unit of calorific values? |
|
Answer» |
|
| 9158. |
Find the relative density different fruits and vegetables and make a list. |
|
Answer» Solution :1. FOLLOW the procedure in Q.No (1) of A.S - (3). 2. Use different fruits and VEGETABLE in the place of wooden BLOCK. 3. Write the observed VALUES in the follwing table. 
|
|
| 9159. |
The age of the Earth can be determined using __________. |
| Answer» SOLUTION :RADIO CARBON DATING | |
| 9160. |
Excess of ATP molecules obtained from proteins are not stored in the body. |
|
Answer» |
|
| 9161. |
Solar array inverter transformer absorber. |
|
Answer» Solar array INVERTER and TRANSFORMER are PARTS of solar photovoltaic station while absorber is PART of solar thermal power station. |
|
| 9162. |
What is the power of a plane mirror? |
| Answer» Solution :It is ZERO (0) SINCE the FOCAL length is at INFINITY | |
| 9163. |
Electric power is the product of . . . . . . . . .and . . . . . . . . . . |
|
Answer» |
|
| 9164. |
Refrigerator is to maintain eatables kept inside at 9^@C . If room temperature is 36^@Ccalculate the coefficient of performance. |
|
Answer» SOLUTION :Here `T_1 = 273 + 36 = 309 K` , `T_2 = 273 + 9 = 2832 K` .COEFFICIENT of PERFORMANCE. `beta=T_2/(T_1T_2)=282/(309-282)=282/27=10.4` |
|
| 9165. |
A cloth strip dipped in onion juice is used for testing a liquid 'X'.The liquid 'X' changes its odour. Which type of an indicator is onion juice ?The liquid 'X' turns blue litmus red. List the observations the liquid 'X' will show on reacting with the following : (a) zinc granules (b) solid sodium carbonate write the chemical equation for the reaction involved. |
|
Answer» Solution :• Onion juice CONTAINS only factory INDICATOR it changes it odour when an ACID or alkali is added to it. • As the liquid X turns blue litmus red it is an acid. (a) `Zn + 2HCl rarr ZnCl_(2) + H_(2) uarr` Hydrogen gas is evolved in this reaction. (B) `Na_(2)CO_(3) + 2HCl rarr 2NaCl + CO_(2) + H_(2)O` An effervescence takes place and `CO_(2)` gas is evolved which turns lime water milky. |
|
| 9166. |
The far point of a myopic person is 80cm in front of the eye. what is the nature and power of the lens required to correct the problem? |
|
Answer» Solution :The person is suffering fi·orn an eye defect called myopia.In this defect, the image is formed in front of the retina. Hence, a concave lens is used to correct this defect of vision. Image distance , v=80cm, Focal length = F According to thelens formula `(1)/(v)-(1)/(U)=(1)/(f)` `-(1)/(80)-(1)/(OO)=(1)/(f)` `(1)/(f)=-(1)/(80)` F=80cm=0.8m We KNOW Power `p=(1)/(f("inmeters"))` ` p=(1)/(-0.8)=1.25D` A concave lens of power 1.25D is required by the person to CORECT his defect |
|
| 9167. |
How the excessive use of social media and technology is proving harmful? |
| Answer» Solution :Excessive use of social media and modern TECHNOLOGY is DISTURBING the social health.It is also affecting physical and mental health.Increase in cybercrime take place.People waste their TIME by watching useless and obscene material. VIOLENCE develops by watching few weird cartoon serials . Dependency on machine rises and persons lose self-reliance. | |
| 9168. |
What do you mean by green energy?Give examples. |
|
Answer» Solution : (1) Green energy means eco-friendly form of energy which does not CAUSE environmental problems and are non-exhaustible, perpetual and sustainable. (2) These sources of energy do not produce toxic gases or other pollutants, therefore they are SAFE. (3) EXAMPLE of green energy : (i) Hydroelectric energy (ii) Wind energy (III) Solar energy (iv) Energy obtained biofuels. |
|
| 9169. |
Increasing crops : Radio phosphorous Effective functioning of heart : _________________ |
| Answer» SOLUTION :RADIO SODIUM (`NA^(24)`) | |
| 9170. |
Briefly explain an activity to plot the magnetic field lines around a bar magnet. Sketch the field pattern for the same specifying field directions. A region A has magnetic field lines relatively closer than another region B. Which region has stronger magnetic field. Give reason to support your answer. |
|
Answer» Solution :1. Take a drawing sheet and fix it on a smooth table with adhesive tape. 2. Place a bar magnet in the middle of the drawing sheet and DRAW its boundary with a sharp pencil. 3. Place a magnetic compass NEAR one end of the magnet (N-pole) and mark the positions of the two ends (N and S-poles) of the compass NEEDLE using a sharp pencil. 4. Shift the compass from this position and place it in such a way that S-pole of its needle is on the point you marked in previous step for N-pole. 5. Again mark the position of the other end (N-pole) of the compass needle.  6. Repeat the steps 4 and 5, till you reach the other end (S-pole) of the bar magnet. 7. Join all the points with a sharp pencil to get a smooth curve. 8. Put the compass at some other points near the N-pole of the magnet and draw another amgnetic field lines. Similarly, draw many field lines on both the sides of the bar magnet as shown in figure. 9. Observe the pattern of the magnetic field lines. Result: Magneticfield lines can be drawn around a bar magnet using a magnetic compass. The field lines do not cross each other. Region A has stronger magnetic field. This is due to the strength of the field is PROPORTIONAL to the relative closeness of field lines. |
|
| 9171. |
Explain the following sentences: Energy obtained from fossil fuels is not green energy. |
| Answer» Solution :(1) Fossil fuels like petrol, diesel or natural gas are polluting fuels. When they are burnt, they emit toxic gases and soot particles. Thus, fossil fuels cause AIR pollution. (2) Incomplete combustion of fuels forms carbon monoxide, that affects our health. BURNING of fossil fuels cause increased levels of carbon dioxide, carbon monoxide and nitrogen dioxide. (3) The increased carbon dioxide emission results in GLOBAL warming. (4) Nitrogen oxide results later in acid-rain. Soot particles generated through burning of fuels cause respiratory problems like asthma. (5) Moreover, the fossil fuels are non-renewable and exhaustible fuels. They have to be explored from the DEEPER layers of the earth causing lots of environmental problems. (6) Green energy is sustainable, renewable and abundant. It never CREATES any environmental problems and is non-polluting. Thus, energy obtained from fossil fuels is not at all a green energy. | |
| 9172. |
On a see saw, two chlidren of masses of 30kg and 50kg are sitting on one side of at distances 2m and 2.5m respectively from its middle. Where should a man of mass 74 kg sit to balance it? |
|
Answer» Solution :Let two children be sitting on the LEFT ARM. They will produce anticlockwise moment due to their weights about the middle point of SEE saw. total anticlockwise moment `=30Kgf TIMES 2m+ 50Kgf times 2.5m` `=60Kgf times m+125 kgf times m=185 kgf times m` To balance, it the man should sit on the right arm so as to produce a clockwise moment about the middle point. Let his distance from the middle be x m. THen Clockwise moment =`74 kgf times xm=74x kgf times m` By the principle of m= moments, in equilibrium Anticlockwise moment= Clockwise moment `185=74x` or `x= 185/74 m=2.5 m` (on the other SIDE) |
|
| 9173. |
The minimum speed of wind necessary for the satisfactory working of a wind generator to produce electricity is about : |
| Answer» Answer :A | |
| 9174. |
Name the colours of spectrum which respectively have (a) maximum wavelength (b) minimum wavelength. |
| Answer» SOLUTION : (a) RED COLOUR. (II) VIOLET colour. | |
| 9175. |
What is solenoid ? Draw the field lines of the magnetic field produced on passing current through and around a current carrying solenoid. |
|
Answer» SOLUTION :DEFINITION : A coil of many circular turns of insulated copper wire wrapped CLOSELY in the SHAPE of a cylinder is called solenoid. Magnetic field lines through and around a CURRENT carrying solenoid. 
|
|
| 9176. |
Mountain roads rarely go straight up the slope, but wind up gradually. Why? |
| Answer» SOLUTION :If ROADS go stratigh up then angle of slope `theta` would be large so FRICTIONAL force `f=mu mg cos theta` would be less and the vechicles MAY slip. Also greater power would be REQUIRED. | |
| 9177. |
Name a machine which is used to : (a) multiply force, (ii) multiply speed, and (c) change the direction of force applied. |
|
Answer» (C) SINGLE fixed pulley. |
|
| 9178. |
Which of the following terms does not represent electrical power in a circuit? |
|
Answer» `I^(2)R` |
|
| 9179. |
The image formed by simple microscope is always ………….and ………….with respect object. |
|
Answer» |
|
| 9180. |
Satellite take approximately 24 hrs. whose earth orbit is .... ....... . |
|
Answer» HIGH EARTH ORBIT |
|
| 9181. |
If Four resistors each of 1 Omega are connected in parallel the effective resistances will be |
|
Answer» `0.5 OMEGA` |
|
| 9182. |
Explain why the maximum height of a mountain on earth is approximateluy 10km ? |
|
Answer» Solution :A MOUNTAIN base is not under uniform com- pression and this provides some shearing stress to the provides some shearing stress to the rocks under which they can flow. The stress due to all the material on the top should be less than the critical shearing stress at which the rocks flow. At the bottom of a mountain of height .h., the force per unit area due to the WEIGHT of the mountain is h`rho`g where `rho` is the density of the material of the mountain and gis the acceleration due to gravity. The material at the bottom experiences this force in the vertical direction and the sides of the moun- tain are free. There is a shear component, approximately h`rho`g it self. Now the elastic LIMIT for a typical rock is `3xx10^(7)Nm^(2)` Equating this to `hrhog" with "rho=3xx10^(3)kgm^(-3)` gives `h=(30xx10^(-7))/(3xx10^(3)xx10)=10km` HENCE, the maximum height of a moun- tain on earth is approximately 10 KM. |
|
| 9183. |
In question 62, the correct variation between sqrt(E) and (1)/(sqrt(p)) is shown by |
|
Answer»
or `"" SQRT(E) prop ` p or `"" sqrt(E) prop (1)/((1)/(p)) ` It is of the FORM `y prop (1)/(x)`, Which is the equation of a rectangular HYPERBOLA, as shown in (a). |
|
| 9184. |
Staement -1 : We do not see twinkling of planets. Statement 2 : Planets are much close to us as compared to stars. Give reason to Statement 1 with the help of Statement 2. |
|
Answer» Solution :1. Plants are much closer to us as compared to stars. They , therefore, do not appera as POINT sources but APPEAR as a collection of point sources. 2. Because of changes in atmospheric REFRACTIVE index the position as well as the brightness of INDIVIDUAL point source changes but the average position and total aberage brightness remains unchanged hence planets do not TWINKLE. |
|
| 9185. |
An ideal gas undergoes cyclic process ACBC as shown is given PV diagram The amount of work done by the gas is |
|
Answer» `6Po Vo` `=AB xxBC` `=(2VO)Po = 2 PoVo` As the TRACE is anticlockwise, the work is done on the gas. Work done by the gas = –2PoVo |
|
| 9186. |
The maximum vertical distance through which a full dressed astronaut can jump on the earth is 0.5m. Estimate the maximum vertical distance through which he can jump on the motion, which has a mean density 2/3 rd that of the earth and radius one-quarter that of the earth. |
|
Answer» 1.5 m |
|
| 9187. |
How is an ammeter connected in a circuit to measure the current flowing through it ? |
| Answer» SOLUTION :In SERIES. | |
| 9188. |
AC Generator: Alternating current: : DC Generator: ..................... |
| Answer» SOLUTION :DIRECT CURRENT. | |
| 9189. |
A body of mass 50 kg has a volume 0.049m^(3). The buoyant force on it as |
| Answer» Answer :D | |
| 9190. |
Which problems does the common nam face due to incidence of cyber crime ? |
|
Answer» Solution :Following aproblems are faced by common MAN due to incidence of cyber crime : (i) Consumers are deceived by showing superior items on websites but actually selling items of either inferor quelity of imparired ones. (ii) Bank transactions are done using PINwithout the knowledge of consumers causing financial loss. (ii) Confieential information about governmentknowledge of consumers causing financial loss. (iii) Confidential information about government institutes andcompanies is bbtained form teh internet with the help of computer programs of OTR ideas andmisused. This is called as hacking of infromation. (iv) Crimesd like openinig a fake ACCOUNT of Fecebook and displaying false information and there by teadsing the girls or exploiting them financially. (v) Elsetronic medial is also misused by sending derogatory messages, spreading vulgar pictures an dinflammatory statements. (vi) Out personal information adn phone number are SPREAD through email, facebook and whatsapp and reaches unwanted personans. This leads to MALPRACTICES like incoming of unnecessary massages. Some of such messages either impair or suct down mobiles and ocmputers. |
|
| 9191. |
Mendeleev's periodic table and Modern periodic table . |
Answer» SOLUTION :
|
|
| 9192. |
It is not necessary to control the fission reaction in nuclear power plants. True/False |
| Answer» Solution :(1) NUCLEAR fissionreaction is a type of chainreaction. Innuclear power plants these reactionsare closelycontrolled. (2)If these reactions are notmanaged properly,there can be more production of neutrons in anuncontrolled way. (3) Each neutron further causes fission of 3 URANIUM (u-235) atoms. (4) Such and more energy UNCONTROLLED reactions can CAUSE hazardous accidents, hence it isabsolutelynecessary to control the fission REACTION in nuclear power plants. | |
| 9193. |
Apart from launching a satellite around the earth, India has been able to launch a satellite around…? |
|
Answer» |
|
| 9195. |
Arrange the following in the chronological order of discovery Nuclear reactor, radioacitivity, artificial radioactivity, discovery of radium. |
| Answer» SOLUTION :Radioactivity (1866), discovery of radium (1898) Artificial radioactivity (1934), NUCLEAR reactor (1942). | |
| 9196. |
Stars as well as planets appear twinkling on a clear night. |
|
Answer» |
|
| 9197. |
For the determining focal length of a concave mirror, a teacher asks her students to identify concave mirror from a few mirrors lying on the table. The reason given by A, B, and D for picking up the right mirror is as follows: A: the mirror is depressed at the center and self image formed is enlarged and erect. B: the mirror is raised at the center and self image formed is smaller and erect. C: the mirror is plane all over and self image is of same size. D: the mirror is depressed at the center and self image formed is enlarged and inverted. Which reason is correct? Justify your answer. |
| Answer» Solution :The REASON given by A is correct. A spherical mirror, WHOSE REFLECTING surface is curved inwards is called a CONCAVE mirror. When the face is PLACED close to concave mirror (so that the face is within the focus) the concave mirror produces enlarged and erect image. | |
| 9198. |
If the stages of human evolution is written in the descending order accoeding to their cranial capacity, then the correct order obtained is |
|
Answer» HOMO HABILIS, Homo ERECTUS, Homo SAPIENS, AUSTRALOPITHECUS |
|
| 9199. |
Name the mode of reproduction of the following organisms and state the important feature of each mode : (i) Planaria (ii) Hydra (iii) Rhizopus |
|
Answer» Solution :(i) Planaria : Regeneration - Involves cell division and cell differentiation. (ii) Hydra : BUDDING - A small outgrowth is produced on parent body which later SEPARATES and becomes independent. (iii) Rhizopus : Spore formation - Special SACS are FORMED where spores are formed which have thick walls |
|
| 9200. |
A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is : (a) Pushed into the coil. (b) Withdrawn from the coil. (c) heldstationary near the coil. Draw diagram to represent each situation and explain the deflection in the galvanometer. |
|
Answer» SOLUTION :(a) Pointer of GALVANOMETER is deflected to the right side. (b) Pointer of galvanometer is deflected to the LEFT side (C) No deflection of the pointer of galvanometer SHOWING current is not induced in this case. |
|
