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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.
| 8251. |
R_(1),R_(2)andR_(3) resistors are connected in parallel in a circuit with a battery voltmeters and ammeters. Draw the circuit for the given situation. |
Answer» SOLUTION :
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| 8252. |
Deduce the expression for the equivalent resistance of there resistor connected in series. |
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Answer» Solution :SERIES connection : In series connection of resistors there is only one path for the flow of current in the circuit. Hence, the current in the circuit is EQUAL to I. According to Ohm's law, `thereforeV_(1)=IR:V_(2)=IR_(2)andV_(3)=IR_(3).` `rArr` Let R be the EQUIVALENT resistance of the combination of resistors in series. `" Also "V=IR_(eq)` `V=V_(1)+V_(2)+V_(3)` `IR_(eq)=IR_(1)+IR_(2)+IR_(3)` `rArrcancel(I)R_(eq)=cancel(I)(R_(1)+R_(2)+R_(3))` `rArrR_(eq)=R_(1)+R_(2)+R_(3)` `therefore` The sum of INDIVIDUAL resistance is equal to their equivalent resistance when the resistors are connected in series. 
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| 8254. |
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset ? |
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Answer» Dispersion of light |
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| 8255. |
Children get addicted to dealdy substance like tobacco, cigarette, gutkha, etc. |
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Answer» SOLUTION :i. Adolescents prefer the company of frients. iii. Due to this, they follow the good or bad habits of their friends instead of FOLLOWING advice of parents and TECHERS. iii. Sometimes, this pree-group pressure makes children try tobacco, cigaratte, gutkha, alcohokic drinks, drugs etc. at very young age. iv. Children may also pickup these habits while imitating their elders or think of them as being symbol of HIGH standard living. Thus, children get addicted to dealdy substances like tobacco, cigarette, gutkha, etc. |
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| 8257. |
Figure below shows a light ray of green colour incident on the prisms A,B and C. in each case, draw the path of the ray of light as it enters and emergest out of the prism. Mark the angle wherever necessary. |
Answer» SOLUTION :The COMPLETED DIAGRAMS are GIVEN in FIGURE. 
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| 8258. |
An energy efficient device for producing light is : |
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Answer» DLF |
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| 8259. |
Two ores X and Y were taken. On heating these ores it was observed that ore X gives CO_(2)gas, and |
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Answer» Solution :Ore X gives the metal by CALCINATION `ZnCO_(3) OVERSET("Heat") rarrZnO + CO_(2)` |
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| 8260. |
The raddishbrowncolourobtainedon theiron nailplacedin coppersulphatesolutionis of________. |
| Answer» ANSWER :C | |
| 8261. |
A student adds a few drops of the universal indicator to a solution o dilute hydrochloric acid in the way shown here. What will be the colour change he observe ? |
Answer» Solution :He will observe that the colour of the solution changes from COLOURLESS to red. This is because dilute HYDROCHLORIC acid is a STRONG acid having a PH value `1`. 
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| 8262. |
Draw ray diagrams showing the image formation by a convex mirror when an object is placed(a) at infinity(b) at finite distance from the mirror |
Answer» SOLUTION :
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| 8263. |
What are the effects of television and video games on children ? |
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Answer» Solution :The effect of television and VIDEO games on children are as follows : i. Children MAY imitate the characters in cartoon films which they have watched. ii. They may also develop a negative tendency by playing games like virtual war and car RACES which include deliberately brough about virtual accidents. iii. Also continous playing of these games on call phones and computers consumes a log of time, affects concentration on some essential subjects and may also prove FATAL in certain cases. iv. It may also lead ot various PHYSICAL problems like tiredness, headache, forgetfulness, etc. |
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| 8264. |
When water boils and is converted into steam,then "…......................". |
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Answer» heat is TAKEN in and temperature REMAINS CONSTANT |
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| 8265. |
State the conclusion based on the observations in (i), (zz) and (in). |
| Answer» Solution :Whenever magnetic FIELD in and around a COIL of insulated WIRE CHANGES, a current is INDUCED in it. | |
| 8266. |
A Carnot engine, having an efficiency of eta=1//10 as heat engine, is used as a refrigerator. If the work done on the system is 10J, the amount of energy absorbed from the reservoir at lower temperature is |
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Answer» 99 J `beta=(1-eta)/eta=(1-1//10)/(1//10)=9` As ` beta = theta_2 / W " or " theta_2 = 90J` |
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| 8267. |
The heating effect of current is used in devices like. . . . . . . . .and . . . . . . . . . . |
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| 8268. |
Combustion of fuel : boiler : : steam converted back to water : __________. |
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Answer» COMBUSTION of fuels takes place in the boiler while STEAM is converted back to WATER in the condenser. |
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| 8269. |
The moon is 4xx10^(8)m from the earth. A radar signal transmitted from the earth will reach the moon in about |
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Answer» 5.2 s |
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| 8270. |
From a certain apparatus, the diffusion rate of hydrogen has an average value of 28.7 cm^(3)s^(-1). The diffusion of another gas under the same conditions is measured to have an average rate of 7.2 cm^(3)s^(-1). Identify the gas. [Hint: Use Graham's law of diffusion : R_(1)//R_(2) = (M_(2)//M_(1))^(1//2), where R_(1), R_(2) are diffusion rates of gases 1 and 2, and M_(1) and M_(2) their respective molecular masses. The law is a simple consequence of kinetic theory.] |
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Answer» Solution :Accoriding to Graham.s law of diffusion, `(r_1)/(r_2) sqrt((M_2)/(M_1))` Where, `r_(1)` = diffusion rate of HYDROGEN `= 28.7 cm^(3)s^(-1)` `r_(2)` = diffusion rate of unknown GAS `=7.2 cm^(3) s^(-1)` `M_(1)` = molecular mass of hydrogen = 2U `M_(2) = ?` `:. (28.7)/(7.2) = sqrt((M_2)/(2)) or M_(2) = ((28.7)/(7.2))^(2) xx 2` `= 31.78 ~~ 32`. |
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| 8271. |
.......is the substance whose physical property is utilised for measuring temperature. |
| Answer» SOLUTION :. THERMOMETRIC SUBSTANCE | |
| 8272. |
The focal length of a convex lens is 20 cm. What is its power? |
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Answer» To find: Power of the lens (P) Formula: `P=(1)/(f(m))` Calculation: From formula, `P=(1)/(0.2)` `=5D` |
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| 8273. |
PSLV , GSLV , INSAT , TV |
| Answer» SOLUTION :TV. As OTHERS are ARTIFICIAL SATELLITE. | |
| 8274. |
How can you relate the formation of water droplets on the outer surface of a bottle taken out of refrigerator with formation of dew. |
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Answer» SOLUTION :(i) When the bottle is TAKEN out of the refrigerator, the air around the bottle cools. (ii) As the air cools, due to decrease in temperature it becomes saturated with water vapour. (iii) As a result, the excess water vapour gets CONVERTED into tiny DROPLETS on the outer surface of the bottle called dew. (iv) This is SIMILAR to the dew we see in the early mornings on leaves of plants and window glass of vehicle. |
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| 8275. |
How does overload and short circuit occur in an electric circuit? Explain. What is the function of fuse during this situation? (ii) Mention two properties of magnetic field lines. |
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Answer» Solution :Overloading can oceur when the live wire and the neutral wire come into direct contact. This occurs when the insulation ot wires is damaged or there is a fauli in the applianee. u such a situation, the current in the cireuit abruptly increases. The heating that takes place in thc luse melts it to BREAK the electrie circuit and prevents the electric appliances trom possible damage. (ii) No two ficld lines are FOUND to cross each otiher. he density of the magnetic FIELD lines are more in their polcs. The nagnetic ficld lines emerge from NORTH pole and merge at south pole. nside the nagnet, the direction of field lines is from its south pole to its north pole. Thus ihe magnetie ficld lines are closed CURVES. |
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| 8276. |
Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more. Reason : Objective lens of large objective lens is more. Reason : Objective lens of large diameter collects more light. |
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Answer» Both assertion and REASON are TRUE and reason is CORRECT explanation of assertion. |
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| 8277. |
What is the audible range of frequency? |
| Answer» SOLUTION :AUDIBLE waves - These are sound waves with a FREQUENCY RANGING between 20 Hz and 20,000 Hz | |
| 8278. |
How are the plants classified ? |
| Answer» Solution :The PLANTS are classified according to the following basis : (1) Presence or absence of the organs . (2) Presence or absence of separate conducting tissues for the conduction of food and water . (3) Presence or absence of seeds in plants . (4) Whether seeds are enclosed in fruits or not. (5) NUMBER of COTYLEDONS in seeds : ONE or two . | |
| 8279. |
What are cartesian sign conventions used in spherical mirror ? What is the mirror formula ? |
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Answer» Solution :The modern cartesian SIGN conventions are : (i) All the rays are drawn from left to right. (ii) All distances are measured from the pole of the spherical mirror. (iii) The distances measured in the direction of the incident light are taken as POSITIVE and those measured in a direction opposite to the direction of incident light are taken as negative. (iv) The heights measured upwards and perpendicular to the principal axis of the mirror are taken as positive and vice versa. Since the object is ALWAYS placed on the left of the mirror, U is always negative. If u is the distance of object and v the distance of image from pole of the mirror, then `1/f=1/v-1/u` `2/R=1/v+1/u` or `1/f=1/v+1/u` |
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| 8280. |
A black surface absorbs more heat radiations as compared to a white surface under identical conditions. List two solar devices which make use of this property in their design. |
| Answer» SOLUTION :SOLAR COOKER, solar PANEL. | |
| 8281. |
In the female reproductive system of human beings, state the functions of(i) ovary (ii) oviduct(b) Mention the changes which the uterus undergoes, when(i) it has to receive a zygote. (ii) no fertilisation takes place.(c) State the function of placenta. |
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Answer» Solution : (i) Ovary – Involved in production of ova and female sex hormone estrogen. (ii) Oviduct – Receives ovum after ovulation and is the site of FERTILISATION. (b) (i) One egg is released each MONTH by one of the ovary, which travels from FALLOPIAN tube into the uterus. Each month, the uterus prepares itself for receiving and implanting zygote. It increases blood supply and thickens the wall. (ii) If fertilisation FAILS to take place the thick and spongy lining of uterus which is formed to receive the fertilised ovum breaks and comes out through the vagina as blood and mucous. This cycle takes place every month and is known as menstrual cycle. (c) Functions : (i) Itprovides large surface area for glucose and O2 to pass from mother.s blood to the embryo. (ii) It also removes EMBRYONAL metabolic wastes. |
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| 8282. |
What is the red coloured wiecomingfrom the electric main board called ? |
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Answer» Theearthing wire |
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| 8283. |
Focal length, radius of curvature, image distance, size of image. |
| Answer» SOLUTION :Size of image All the other DISTANCES are measured from OPTICAL cntre along the principal AXIS while size of image is measured perpendicular to the axis. | |
| 8284. |
(i) Make a ray diagram to show how the eye defect- myopia is corrected by using a suitable lens. (ii) State two reasons due to which this eye defect may be caused. (iii) A person with myopic eye cannot see objects beyond a distance of 1.5 m. What is the power of the lens required to correct the problem? |
Answer» Solution :(i) (ii) (a) Elongation of the eye BALL (b) Decrease in focal length of eye LENS. (iii) `u=oo, V=-1.5m` `P=(1)/(F)=(1)/(u)-(1)/(v)` `=(1)/(-1.5)=-0.66 D` |
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| 8285. |
Define electric current? |
| Answer» SOLUTION :Time rate of flow of CHARGE through any CROSS section of a conductor is called ELECTRIC current. | |
| 8286. |
Open circulatory system : Arthropods :: Thin cuticle and parapodia : …… |
| Answer» SOLUTION :ANNELIDA | |
| 8287. |
Complete the following conceptual picture : |
Answer» SOLUTION :
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| 8288. |
Electric generators work on the principle of ............ |
| Answer» SOLUTION :ELECTROMAGNETIC INDUCTION | |
| 8290. |
Silver is a better conductor of electricity than copper. Whey do we use copper wire for conduction of electricity ? |
| Answer» Solution :The resistivity of silver is `1.59xx10^(-8)Omegam" and that of COPPER is "1.68xx10^(-8)Omegam.` The resistivity of silver is LESS than copper. Hence, the conductivity of silver is more than copper. If we use silver for CONDUCTION of electricity it will be better, but silver is a costly metal than copper. Hence copper is widely USED for conduction. | |
| 8291. |
What is the functionofiris ? |
| Answer» Solution :It is RESPONSIBLE for colour of EYE and ACTS as a SHUTTER of cemera to CONTROLTHE amount of light entering the eye. | |
| 8292. |
(a) What is fertilzation ? (b) Distinguish between internal and external fertilization. (c) What is the site of fertilization in human beings ? |
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Answer» Solution :(a) Union of male GAMETE with FEMALE gamete. (b) Internal : FERTILIZATION TAKES place inside the female body. External : Fertilization takes place inside the female body (c) Fallopian tube |
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| 8293. |
Fused quartz : 1.46 : : Turpentine oil |
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| 8294. |
A point charge +q is placed at a distance d from an isolated conducting placen. The field at a point P on the other side of the place is: |
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Answer» directed PERPENDICULAR to the plane and away from the plane. |
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| 8295. |
The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air form nostrials to the lungsin human beings. or Mention three characterisitc features of hormonal secretions in human beings. |
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Answer» Solution :The animals which live in water ( aquatic animals) use the oxygen dissolved in water to carry out respiration . Since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore, the rate of breathing in aquatic animals is much faster than in terrestrial animals. A faster rate of breathing PROVIDES more oxygen to aquatic animals. Pathway of air in human beings `:` Nostrials `rarr`PHARYNX` rarr`Larynx ` rarr`Trachea ` rarr ` Lungs or (i) A group of endocrine glands which produces various hormones is called an endocrine system. The endocrine system is also called hormonal system. (II) The endocrine systemalso helps in coordinating the activities of our BODY . The endocrine system in our body consists of a number of glands ( or tissues ) which make, store, and release chemicals called hormones. (III) The working of endocrine glands is controlled by our nervous system. The hormones produced by endocrine glands act as messengers between the nervous system and the organs of our body. |
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| 8296. |
Which plant hormone promotes cell divisions ? |
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Answer» AUXIN |
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| 8297. |
a) Explain any two practical applications of heating effect of electric current. b) An electric bulb is connected to a 220V generator. If the current drawn by the bulb is 0.5A, then calculate the power of the bulb. |
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Answer» SOLUTION :(a)The HEATING effect of electric current is used in the following applications. Electric bulb : In an electric bulb, the FILAMENT of bulb gives light because of heating effect of electricity. The filament of bulb is generally made of TUNGSTEN metal, having melting POINT equal to `3380^@C.` Electric iron : The element of electric iron is made of alloys having high melting point. Electric heater and geyser work on the same mechanism. Given V = 220 , I = 0.5 A, P = ? P = VI ` = 220 V xx 0.50A ` = 110 J/S = 110 W |
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| 8298. |
What is meant by electric current ? Name and define its SI unit. In a conductor electrons are flowing from B to A. What is the direction of conventional current? Give justification for your answer. A steady current of 1 ampere flows through a conductor. Calculate the number of electrons that flow through any section of the conductor in 1 second. (Charge on electron =1.6 times 10^-19 coulomb) |
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Answer» Solution :Electric current is defined as the rate of flow of electric charge through a cross section of a CONDUCTOR. IF Q charge PASSES through a section of a conductor in TIME t, then current `I=Q/t` Si unit of electric current is an ampere (A). Current is said to be one ampere, if rate of flow of charge through a cross section of conductor be 1 coulomb per second. Direction of conventional current is taken as the direction of flow of positive charge or opposite to the direction of flow B to A Then the direction of conventional current will be form A to B. Here current I=1A time t=1s and charge on electron `e=1.6 times 10^-19C`. Let n electrons flow through a section of conductor so that charge passing through the section is Q =ne. `therefore I=Q/t=(n e)/t implies n= (I t)/e=(1 times 1)/(1.6 times 10^-19)=6.25 times 10^18` |
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| 8299. |
In the process of fission Uranium- 236 converts into atoms of Barium and Krypton releasing two neutrons and 200 me V energy. |
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| 8300. |
Why do you think there should be equitable distribution of resources ? What forces wouldbeworking against an equitable distribution of our resources ? |
| Answer» Solution :The management should ensure equitable DISTRIBUTION of resources , so that both rich and poor are BENEFITTED . Powerful and rich people take ADVANTAGE to their influence and get more benefit as COMPARED to poor people . The money and powerare important factors which WORK against the distributions of our resources . | |