InterviewSolution
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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.
| 1601. |
Draw a schematic diagram showing electromagnetic induction by using two coils and explain the observations. |
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Answer» Solution :Taketwo different coils (say P and Q) of insualted copperwirehavinglarges numberof turns. Insert the two coilsover a NON - conducing cylindrical thick paper roll. Connect a batteryand a plug key K in series of COIL - 1(P) . Withcoil- 2 (Q) ALSO givena momentary deflection and then thepointer QUICKLY returnsto its mean position. Now remove the plug from key K. The galvanometer in coil-2(Q)again gives a momentary deflection but in the reverse direction. Moreover, we observe that as soon as current in coil-1 (P) becomes EITHER steady or zero, there is no deflection in galvanometer. From the above experiment, we conclude that an induced current is produced in coil 2 (Q) on account of electromagnetic induction whenever current in coil-1 (P) is changing. 
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| 1602. |
A student stes up an electric circuit shown here for finding the equivalent resistance of two resistors in series : In this circuit, the : |
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Answer» RESISTORS have been CONNECTED correctly but the VOLTMETER has been WRONGLY connected |
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| 1603. |
(i) Why do parallel rays of different colours deviate differently while passing through a glass prism? (ii) Name any two phenomenon associated with the formation of a rainbow. |
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Answer» Solution :(i) Parallel rays of different COLOURS DEVIATE differently while passing through a glass PRISM because ANGLE of refraction of different colours are different hence there is difference in refractive index. (ii) (a) TOTAL Internal reflection, (b) Refraction. |
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| 1604. |
Describe a simple experiment to demonstrate variation of resistance on (i) length (ii) Cross section area and (iii) material of the conductor. What are the conclusions drawn? |
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Answer» Solution :To demonstrate dependence of resistance on length, cross section area and material of the conductor we complete an electric circuit as shown in fig 12.25. (i) EFFECTIVE of length: Take the resistance wire number 1 of length l and connect, it in the circuit. Put plug in key K and note ammeter reading `I_1`. Now instead of wire number 1, connect wire number 2 of double length but of same material and same thickness. As before note ammeter reading `I_2`. Experimentally it is observed `I_2=I_1/2` It shows that resistance of 2nd wire is double of 1st wire. Thus, we conclude that `R_2/R_1=l_2/l_1=(2l)/l=2 or R prop 1` (ii) Effect of cross section area: Replace the wire by resistance wire number 3 of length l but the thickness more than wire number 1. Put plug in key and note ammeter reading `l_3`. It is more than `I_1`. It means for a thicker wire (i.e., a wire of greater cross sectional area) the resistance is less. EXACT calculations SHOW that resistance is inversely proportional to cross section area of the conductor. Thus, `R prop 1/A` (iii) Effect of material: Now,take a wire number 4 of some other material but of length l and same thickness as wire number 1. Connect the wire in the circuit and again note ammeter reading `I_4`. We find that `I_4` is different from `I_1`. It shows that resistance depends on material of the conductor. 
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| 1605. |
An object 5 cm in length is held 25 cm away from a converging lens of focal length 10 cm. Draw the ray diagram and find the position, size and nature of the image formed. |
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Answer» Solution :`h_(1)=5cm` `u--25CM` `f=10cm` `V=?` `h_(2)implies?`  `1/f=1/v-1/u` `1/v=1/f+1/u` `=1/10+1/(-25)` `v=250/15` `v=50/3` `v=16.67cm` `(h_(2))/(h_(1))=v/u` `h_(2)=v/uxxh_(1)` Or `(h_(1))/6=16.7/(-2.5)` `h_(2)=3.34cm`  Image is REAL and inverted. |
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| 1606. |
Does an induced emf develop in a conductor when moved in a direction parallel to the magnetic field ? |
| Answer» SOLUTION :No, because the magnetic FIELD lines linked with the conductordo not CHANGE when it moves PARALLEL to the magnetic field. | |
| 1607. |
When will be the forceexerted by the floor of an elevator on the foot of a personstandingthere is more than the weightof the person ? |
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Answer» SOLUTION :If the elevatoris (i) GOING up and SLOWING down and (II) going up and SPEEDING up. |
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| 1608. |
Explain how concave lenses are used in the following devices. Torch |
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Answer» Solution :Torch: Light produced by a small bulb inside the torch is SPREAD to large AREA using a CONCAVE LENS. |
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| 1609. |
The apparent depth of an object plaecd in a denser medium and seen through a rarer medium is ………… . |
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Answer» greater than the real DEPTH |
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| 1610. |
What is natural resource ? |
| Answer» Solution :Any component of NATURAL environment that can be utilized by man for his welfare is CALLED natural RESOURCE. | |
| 1611. |
Refractive index of glass is (3)/(2) and the refractive index of water is (4)/(3). Then the refractive index of glass with respect to water is |
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Answer» `(3//2)/(4//3)` `=("Refractive index of glass")/("Refractive index of water") (n_(g))/(n_(w)) = (3//2)/(4//3) = (9)/(8)` |
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| 1612. |
Read the following extract and answer the questions that follow : A liberal view behind the concept of organ and body donations is that after death our body should be useful to other needful persons so that their miserable life would become comfortable. Awareness about these concepts is increasing in our country and people are voluntarily donating their bodies. Life of many people can be saved by organ and body donation. Blinds can regain their vision. Life on many people can be rendered comfortable by donation of organs like liver, kidneys, heart, heart valves, skin, etc. Similarly, body can be made available for research in medical studies. Many government and social organizations are working towards increasing the awareness about body donation. Name any four organs that can be denated. |
| Answer» SOLUTION :Liver, KIDNEYS, heart, EYES, skin, etc. can be DONATED. | |
| 1613. |
Observe the schematic of thermal power plant and the nuclear plant. Discuss what are the cimilarities and difference between the two? |
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Answer» Solution :Similarities between THERMAL power plant and nuclear power plant: (i) Both have a boiler for heating of water. (ii) Both consist of a TURBINE which is used to rotate the generator. (iii) Both consist of a generator which generates the electrical energy . (iv) Both have a COOLING tower where the steam is converted back to water (v) Both consist of a condenser and pump which help in circulating the water. |
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| 1614. |
Read the following extract and answer the questions that follow : A liberal view behind the concept of organ and body donations is that after death our body should be useful to other needful persons so that their miserable life would become comfortable. Awareness about these concepts is increasing in our country and people are voluntarily donating their bodies. Life of many people can be saved by organ and body donation. Blinds can regain their vision. Life on many people can be rendered comfortable by donation of organs like liver, kidneys, heart, heart valves, skin, etc. Similarly, body can be made available for research in medical studies. Many government and social organizations are working towards increasing the awareness about body donation. What is the liberal view behind the organ and body donation? |
| Answer» Solution :By body DONATION RESEARCH in medical studies is POSSIBLE. The needy persons can get vital organs which can SAVE their lives. | |
| 1615. |
Post-disaster management: |
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Answer» Solution :The management measures taken after the striking of a disaster is called post-disaster management. Following steps are taken during post-disaster management. (1) Helping the victims of disasters by GIVING allpossible help needed for their SURVIVAL. (2) Local people are trained to take part in thedisaster management so that affected people can besaved rapidly. (3) Establishing the help CENTRES that couldprovide all the necessary help. Such centres will be ,different in case of different disasters. (4) COLLECTION and categorization of the materialreceived from control centre for helping the victims.Distributing the same and reviewing the measurescontinuously. (5) Disaster rescue PROGRAMMES are mainlyfocused. |
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| 1616. |
Give the physical significance of moment of inertia. Explain the need of fly wheel in Engine |
| Answer» SOLUTION :It plays the same role in ROTATORY motion as the MASS does in TRANSLATORY motion. | |
| 1617. |
When two 2Omegaresistors are connected in parallel, the effective resistance is. . . . . . . . . . |
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Answer» `4 Omega` |
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| 1618. |
_____________aprons are used to protect us from gamma radiations |
| Answer» Answer :C | |
| 1619. |
The strength of a magnetic field inside a long current-carrying straight solenoid coil is |
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Answer» more at the ends than at the centre. |
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| 1620. |
Record the temperature using the thermometer after every minute. |
Answer» SOLUTION : The GRAPH of temperature VERSUS time is SHOWN below. 
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| 1621. |
Draw a labelled diagram of an electric circuit comprising a battery, electric bulb, ammeter and plug key (closed). Show the direction of the conventional current. |
Answer» SOLUTION :
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| 1622. |
The moment of inertia of two rotating bodies A and B are I_(A) and I_(B) (I_(A) gt I_(B)) and their angular momentum are equal. Which one has a greater kinetic energy? |
| Answer» SOLUTION :`K=L^(2)/(2I) rArr K_(B) GT K_(A)`. | |
| 1623. |
When oils and fats are allowed to stand for a long time , they becomes rancid. |
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Answer» |
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| 1624. |
The main cause for abundant coliform bacteria in the river Gange is |
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Answer» disposal of UNBURNT corpses into water |
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| 1625. |
Complete the following sentences: (a) The kinetic energy of a body is the energy by virtue of its.. . (b) The potential energy of a body is the energy by virtue of its ………. |
| Answer» SOLUTION : (a) MOTION (B) POSITION | |
| 1626. |
We wish to obtain an errect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror ? What is the nature of the image ? Is the image larger or smaller than the object ? Draw a ray diagram to show the image formation is this case. |
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Answer» SOLUTION :Given that the focal length of concave mirror is 15 cm. To form an ERECT image object MUST be placed in front of concave mirror between its pole P and PRINCIPAL FOCUS F. Hence, the object AB should be placed in front of given concave mirror at a distance less than 15 cm. The image formed A.B. is virtual and erect. The size of the image is larger than the object. The ray diagram is as given here. 
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| 1627. |
What is bauxite ? What are the main impurities found in this ore ? |
| Answer» Solution :BAUXITE ` (Al_(2)O_(3).H_(2)O)`is a hydrated aluminium OXIDE. It contains30% to 70% ` AI_(2)O_(3)` . The main impuritiespresent in it are iron oxide ` (Fe_(2)O_(3)) and "sand" (SiO_(2))` | |
| 1628. |
Assertion: A beaker is completely filled with water at 4^(@)C . It will overflow when heated or cooled. Reason: There is expansion of water below& above 4^(@)C. |
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Answer» both the assertion and the reason are trueand the reason is the correct explanation of the assertion. |
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| 1629. |
In a hexaploid wheat (2n=6x=42) the haploid (n) and the basic (x) number of chromosomes respectively are:- |
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Answer» `n=7andx=21` |
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| 1630. |
What is electrical resistivity of a material? What is its unit? Describe an experiment to study the factors on which the resistance of conducting wire depends. |
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Answer» Solution :The electrical resistivity of a material is defined as the resistance of a conductor made of that material of unit length and unit cross-sectional area. Its SI unit is Ohm metre `[Omegam]` `R=rhol/Atorho=(RA)/l` [where, `A=2m^(2)//l=1m]` Consider an electric CIRCUIT consisting of a cell, an ammeter, a nichrome wire of length L [marked I to 4] and a plug key as shown below  Plug the key and note the current in the ammeter. Replace the nichrome wire by another nichrome wire of same thickness but twice the length that is 2l at point 2. Again note the reading. Now, replace the wire by a thicker nichrome wire of same length [marked 3]. A thicker wire has a larger cross-sectional area. Again note down the current through the circuit. Replace nichrome wire with COPPER wire of same length and same area of cross-section at point 4, Note the value of current. Notice the difference in the current in all cases. When the length of the wire is doubled, then the ammeter reading decreases to half its previous value i.e., current through the wire is halved. SINCE, resistance of the wire R = V/I, then R is doubled which implies R (prop) L [Use proportional symbol]. When the nichrome wire is REPLACED by a thicker one of same material and length, the current in the wire increases which means that the resistance of the thicker wire [3] is less than that of the thinner wire [l]. This implies R proportional to 1/A where A is area of cross section of the wire. When the nichrome wire is replaced by a copper wire [4] of the same length and same cross-sectional area, then the current RECORDED by the ammeter is more. This means that the resistance of copper wire is less than that of the nichrome wire of the same dimensions i.e. the resistance of the wire depends on the nature of its material. |
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| 1631. |
Judge the equivalent resistance when the following are connected in parallel to" a."1Omegaand10^(6)Omega."b".1Omegaand10^(3)Omegaand10^(6)Omega. |
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Answer» Solution :(a) The equivalent resistance of `1OMEGA`and `10^(6) OMEGA`will be less than `1 Omega` because inparallel combination equivalent resistance is less than the LEAST. (B) Due to the same reason as above, equivalent resistance will be less than `1 Omega` . |
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| 1632. |
Heatingeffectof electriccurrentdoesnotobservedin ______ |
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Answer» ELECTRIC oven |
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| 1633. |
Double fertilization in angiosperms. |
Answer» SOLUTION : 
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| 1634. |
The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem? |
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Answer» <P> SOLUTION :`f=-80cm``P=(1)/(f)` `=(1)/(-80)` `P=-1.25D` Nature of the lens is CONCAVE. |
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| 1635. |
When a light ray emerges out after refraction at a rectangular glass slab, it is parallel to the incident ray. Why ? |
| Answer» SOLUTION :The bending of light ray at the AIR - GLASS interface is equal to the bending of the light ray at the glass - air interface. The incident ray is thus PARALLEL to the emergent ray. | |
| 1636. |
Mechanical advantage (M.A.), load (L) and effort (E) are related as : |
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Answer» `M.A.=LxxE` |
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| 1637. |
The band of colours is termed as __________ . |
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Answer» MONOCHROMATIC source |
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| 1638. |
Smooth block is released at rest on a 45^@ incline and then slides a distance d. If the time taken of slide on rough incline is n times as large as that to slide than on a smooth incline. Show that coefficient of friction. mu=(1-1/n^(2)). |
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Answer» Solution :When there is no friction, the block slides down the inclined plane with acceleration. `a = g SIN theta` when there is friction, the downward acceleration of the block is `a'=g (sin theta-a cos theta)` As the block slides a DISTANCE d in each case so `d=1/2 at^(2)=1/2 a't^(2)` `a/(a')=(t'^(2))/t^(2)=((NT)^(2))/(t^(2))=n^(2)` `or (g sin theta)/(g(sin theta-mu cos theta))=n^(2)` Solving, we get `("USING "theta-45^(@))` `mu=1 -1/n^(2)` |
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| 1639. |
Efficiency of ………… and liver as well as lifespan of person decreases due to alcoholism. |
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Answer» |
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| 1640. |
A domesticcircuithas a line of 5A ratting. Howmany lamps of ratting 40w, 220 V can berun simultaneously on this line safely ? |
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Answer» Solution :The currentratingof one lamp . ` I = (P)/(V) = (40W)/(220 V) =(2)/(11) A` Thus, CURRENT of `(2)/(11)A` is requiredby one lamp to glow completely. Now , the currentrating (i.e., Maximum currentin the line )= 5A. `therefore`The numberof lamps that can be RUN simultaeouslyon thisline safely . ` = ("current rating of the line")/("current rating of one lamp")` `= (5A)/((2)/(11)A)` ` = (55)/(2)` ` = 27.5` `~~27` |
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| 1641. |
An air-tight cage with a parrot sitting in it is suspended from the spring balance. The parrot starts flying. The reading of the spring balance will |
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Answer» increase |
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| 1642. |
Activities under the jurisdiction of cybercrime laws. |
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Answer» Solution :To do BANK transaction by procuring PIN number of somebody (2) Misuse of WRITTEN material of someone or ILLEGAL sale of the same (3) Hacking the information of government INSTITUTES and companies |
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| 1643. |
Name two main abiotic factors, which affect the human environment. |
| Answer» SOLUTION :These FACTORS are TEMPERATURE and HUMIDITY . | |
| 1644. |
A current - carrying conductor is placed peprendicular to thedirection of a unifrom magneticfield . Theelectron and protonexperiene. |
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Answer» Maxwell's cork screw rule |
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| 1645. |
Make a schematic diagram of solar thermal electric energy generation : |
Answer» SOLUTION :
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| 1646. |
Coefficient of cubical expansion of liquid is independent of ___________. |
| Answer» SOLUTION :TEMPERATURE | |
| 1647. |
Complete the table. (Motor accident, landsliding, forest fire, theft, riot, war, epidemic, drought, locust attack, financial crisis,flood, famine) |
Answer» SOLUTION :  
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| 1648. |
How can you find relatve density of a liquid ? |
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Answer» Solution :Aim : To find the relative density of a LIQUID. MATERIALS required : Small bottle of 50 ml CAPACITY (the bottle should weigh not less than 10 gm), spring balance, any liquid (milk or oil or kerosene) about 50 ml. PROCEDURE : 1. Find thej weight of emty 50 ml bottle. 2. Fill the bottle with water and weigh it. 3. Find the weight of 50 ml water. 4. Remove water from the bottle and fill it with any liquid (say milk). 5. Weight the bottle with liquid. 6. Weight of 50 ml liquid = Weight of bottle with liquid-Weight of empty bottle 7. `"Relative density of liquid"=("Weight of the liquid")/("Weight of same volume of water")` 
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| 1650. |
When a 4 V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. The value of the resistance of the resistor is |
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Answer» `4 OMEGA` |
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