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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.
| 6001. |
Which of the following can be used to express energy ?The symbols used have their usual meanings for the units of physical quantities. (i) Wh (ii) VC (iii) AV s ^(2) (iv) A ^(2) Omega s |
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Answer» (i) and (III) |
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| 6002. |
How will you explain the following statements with the help of the anamolous behaviour of water ? (1) In regions with cold climate,the aquatic plants and animals can survive even when the atomospheric temperature goes below 0^(@)C. (2) In cold regions in winter the pipe for water supplybreak and even rocks crack. |
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| 6003. |
Calculatethe numberof watermoleculespresentin onedropof waterwhichweights 0.18 g. |
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Answer» Solution :The Molecular Mass of water `H_(2)O` is 18. 18 g of water molecule = 1 mole 0.18 g of water = `(1)/(18)xx0.18=0.01` mole. One mole of water CONTAINS `6.023xx10^(23)` (water MOLECULES) `therefore 0.01` mole of water contains `(6.023)/(1)xx10^(23)xx0.01=6.023xx10^(21)` molecules. |
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| 6004. |
Mention any three differences between an electric motor and an electric generator. |
| Answer» SOLUTION :`{:("SI. No . ","Electric motor" ,"Generator"),(1.,"Converts electrical energy into mechanical energy.","Converts mechanical energy into electrical energy."),(2.,"Based on magnetic effect of electric current." ,"Based on electromagnetic INDUCTION"),(3.,"Current is passed through a coil PLACED in a magnetic field by an external source of electrical energy. THUS , coil starts rotating." ,"A coil is rotated in a magnetic field by an external arrangement . Due to this, an electric current is induced in the coil."):}` | |
| 6005. |
The element with atomic number 84 and mass number 218 change to other element with atomic number 84 and mass number 214. The number of alpha and beta particles emitted are respectively. |
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Answer» SOLUTION :`""_(84)X^(218) OVERSET( alpha "decay") to ""_(82)Y^(214)+ x""_(2)He^(4)` `""_(82)Y^(214) overset(2beta) to ""_(84)Y^(214)+y""_(2)e^(0)` Number of alpha decay, X = 1 Number of beta decay, y = 2 |
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| 6006. |
Name the properties of light that causes the following phenomena. |
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Answer» ADVANCED sunrise and delayed sunset b). Spectrum - Dispersion of light C). Mirage - Refraction of light d). Shadow - Reflection of light |
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| 6007. |
Vaibhav had gone to his uncle's home in a foreign country where the domestic electric supply is D.C. (Direct Current). An electrician was working in his uncle's kitchen who was trying to find out the location of electric wiring in a particular wall for further electrical work. Failing to do so, the electrician recommended the breaking of substantial portion of the kitchen wall. Vaibhav told his uncle that he could locate the position of current-carrying wires in the kitchen wall without breaking the kitchen wall. In order to do this, Vaibhav purchased a small device from the market and moved it slowly over the whole kitchen wall. After about ten minutes, Vaibhav could locate the position of all the current-carrying wires in this kitchen wall. His uncle was happy that now only a small portion of the kitchen wall will have to be dismantled. (a) What was the small device purchased by Vaibhav ? (b) What was noticed by Vaibhav when this device was moved slowly over the current-carrying wires embedded in the wall ? (c) What name was given to the effect which helped Vaibhav to locate the concealed current-carrying wires in the wall ? Name the scientist who discovered the above effect. (e) What values are shown by Vaibhav in this episode ? |
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Answer» SOLUTION :(a) Vaibhav purchaseda plotting compass. (b) When Vaibhav moved the plotting compass over the WALL slowly, the compass needle was deflected from its usual north-south position whenever compass came over the current-carrying wires. (c) Magnetic effect of electric current. (d) Oersted. (e) The values shown by Vaibhav are (i) Knowledge of scientific facts (that even a concealed current-carrying wire in a wall can CREATE magnetic field around it and deflect compass needle), and (ii) APPLICATION of knowledge in everyday situations. |
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| 6008. |
When electrons are added to an uncharged body, then the body |
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Answer» gets negatively CHARGED |
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| 6009. |
Discuss. 'Jivo Jivasya Jivanam' |
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Answer» Solution :i. 'Jivo Jivasya Jivanam' MEANS one living being is food for another. ii. Considering an ecosystem, the primary consumers feed on the producers and the secondary consumers feed on the primary consumers and soonand so forth. iii. If a SINGLE component of this food chain is disturbed the entire food chain is affected. Therefore, it can be SAID that one living being is food for another i.e., 'Jivo Jivasya Jivanam'. |
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| 6010. |
Fallopian tubes/ ducts : |
| Answer» SOLUTION :Transporting the released oocyte after OVULATION to the UTERUS. Providing space for fertilization of. oocyte by sperm. Conception is possible only when sperm and oocyte MEET in the fallopian tube. | |
| 6011. |
An electric heater is used on 220 V supply and takes a current of 5A. What is ita power ? Calculate the per hour cost of using the beater if 1 unit costs Rs 6.0. |
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Answer» Solution :POWER =VI `=220 xx5=1100 ` Watt `=1.1 kW` COST PER hour = `1.1xx6` `= ₹ 6.6 ` |
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| 6012. |
If the height of falling water is increased, more electrical power can be generated in a hydroelectric power plant. Why? |
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Answer» <P> SOLUTION :More water molecules dissociate into lons.( B) Temperature of water increases (c] LARGER amount of POTENTIAL energy [P = mgh] is converted into kinetic energy. (d) The electricity content of water increases with height. |
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| 6013. |
What will you do if, the child of your neighbour is addicted to tobacco chewing ? Why ? |
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Answer» Solution :If I find that the child of my neighbour is addicted to tobacco chewing. i. I will MAKE him aware bout the health problems associated with chewing tobacco like MOUTH cance, tooth decay, gum DISEASES, etc. This will help him to make decision about quitting tobacco. ii. I will advise him to reduce the use of tobacco everyday till he FINALLY wuits it completely. iii. I will also make him talk to his family or friends regarding the issue, so as to help him get RID of the habit. |
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| 6014. |
First aid:__________________::Clearing debris: Transitional phase |
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Answer» SOLUTION :PHASE of emergency CLEARING of DEBRIS is a part of transitional phase after a DISASTER, whereas first aid is a part of phase of emergency. |
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| 6015. |
Suggest a suitable physical situation for the following graph. |
| Answer» SOLUTION :A ball THROWN up with some initial velocity rebounding from the FLOOR with reduced speed after each HIT. | |
| 6016. |
Arrange the following fuels in the order of decreasing calorific values (keeping the fuel with highest calorific value first) :Biogas, Kerosene, Wood, Petrol, Hydrogen gas, Methane |
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| 6017. |
State the energy transformation taking place at hydropower plants. List two advantages of setting up hydropower plants. |
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Answer» Solution :Mechanical/potential energy Electrical energy ADVANTAGES : (i) It does not cause pollution. (II) Uses RENEWABLE source of energy. (III) Continuous SUPPLY of water for irrigation. |
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| 6018. |
Describe the rocket propultion. |
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Answer» Solution :(i) Propulsion of rockets is baed on the law of conservation of linear momentum as well as Newton.s III law of motion. (ii) Rockets are filled with a fuel (either liquid or solid) in the propellant tank. When the rocket is fired, this fuel is burn and a HOT gas is ejected withahigh speed from the nozzle of the rocket, producing a huge momentum. (iii) To balance this momentum, an EQUAL and opposite reaction force is PRODUCED in the combustion chamber, which makes the rocket project forward. (iv) While in motion, the MASS of the rocket gradually decreases, until the fuel is completely burnt out. (v) At one stage, it reaches a VELOCITY, which is sufficient to just escape from the gravitational pull of the earth. this velocity is called escape velocity. |
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| 6019. |
Concave lens is used in magnifying glasses. |
| Answer» Solution :A magnifying glass is a CONVEX Jens which produces a magnified image of an object. For a magnified image to be OBSERVED the distance between the object and the lens has to be shorter than the focal LENGTH OFTHE Jens: The image fo"rmed is upright, magnified and VIRTUAL. Hence a convex lens is used in manufacturing magnifying glasses. | |
| 6020. |
Weight and Mass |
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Answer» Solution :Mass(m): i. Mass is the amount of matter present in the object. ii. Mass does not CHANGE with PLACE. III. SI unit is kg. CGS unit is gram (g). (iv) Mass is a scalar quantity. Weight (W): (i). Weight is the FORCE with which the Earth attracts the object. (ii) Weight (W)`=mg` As g CHANGES W also changes. (iii) SI unit is newton. CGS unit is dyne. (iv) Weight is a vector quantity. |
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| 6022. |
Bread : Baker's yeast : : Soya sauce : ….. |
| Answer» SOLUTION :ASPERGILLUS ORYZAE | |
| 6023. |
The importance of disaster management has become the foremost requirement of almost all the nations. |
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Answer» Solution :i. Although production of certain harmful CHEMICALS has been banned in developed nations, they are still being PRODUCED indeveloping and poor countries. This can lead to disasters. ii. Increase in atomic energy plants in many countries poses a threat to life, in case of radiation leakage due to CARELESSNESS. iii. Example: In an atomic energy plant at Chernobyl , Russia, meant for electricity generation, radiation leakage occurred after a blast. The after -effects of this disaster were long term and catastrophic. iv. Human activities cause DRASTIC changes in the atmosphere leading to various natural disasters like droght, flood etc. Hence importance of disaster management has become the foremost REQUIREMENT of almost all the nations. |
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| 6024. |
Two conducting wires of the same material and of equal. lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be - |
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Answer» `1:2` |
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| 6025. |
Name any two elements that are used in fabricating solar cells. |
| Answer» SOLUTION :Silicon/Gallium/Silver. | |
| 6026. |
What shall be the direction of the incident ray which after reflection from a spherical mirror retraces its path ? |
| Answer» Solution :In this case INCIDENT ray is directed TOWARDS the centre of CURVATURE. | |
| 6027. |
Define the term induced electric current. |
| Answer» Solution :CURRENT DEVELOPED in a coil, when magnetic field AROUND it CHANGES , is called INDUCED current. | |
| 6028. |
A stone tied to a string is whirled in a circle. As it is revolving, the rope suddenly breaks. Then |
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Answer» the stone flies off tangentially |
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| 6029. |
(i)Classify the types of force based on their application . (ii)Which instrument is used to measure the electric current? How should it be connected in a circuit? |
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Answer» Solution :Based on the direction in which the forces act, they can be classified into TWO types as: (i)Like parallel forces and (ii)Unlike parallel forces Like parallel forces: Two or more forces of equal or unequal magnitude acting along the same direction, parallel forces to each other are called like parallel forces. Unlike parallel forces :If two or more equal forces of unequal forces act along opposite directions parallel to each other, then they are called unlike parallel forces. (a) AMMETER is used to measure the CURRENT. (b) An Ammeter is connected in series with the circuit. (c) The Ammeter is a low impedance device connecting it in parallel with the circuit would cause a short circuit, DAMAGING the Ammeter or the circuit . |
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| 6030. |
The miracle rice which saved millions of lives and celebrated its 50th birthday is |
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Answer» IR8 |
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| 6031. |
The far point of a myopia eye is 60 cm. Find the focal length of the lens used to correct it. |
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Answer» Solution :Given, far POINT = v = -60 cm = -0.6 cm, Object distance `= u = -oo`. USING lens formula , `(1)/(v)-(1)/(u) = (1)/(f) = (1)/((-0.6)) = (1)/(f)` So, FOCAL LENGTH = f = -0.6 m = -60 cm. |
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| 6032. |
State one difference between Kilowatt and Kilowatt hour. Express 1 kWh in joules. |
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Answer» SOLUTION :KILOWATT (kW) : large unit of ELECTRIC powerKilowatt hour (kWh) : commercial unit of electric energy. 1 kWh -`3.6xx10^(6)` JOULES |
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| 6033. |
Common forms of ocean energy are |
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Answer» WASE energy |
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| 6034. |
Complete the Chart : Different problems occur with disasters. In the concept map different effects are mentioned . Read it and fill in the blank places. |
Answer» SOLUTION :
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| 6035. |
Writenotes on variousfactorsaffectingsolubility. |
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Answer» SOLUTION :(i) factors affecting solubility: There are three main factors which govem the solubility of solute they are: (i) Nature of the solute and solvent (ii) Temperature (iii) pressure (i)Nature of the solute and solvent: the nature of the solute and solvent plays an important role in solubility. Although WATER dissolves an enormous variety of substances, both ionic and covalent, it does not dissolve everything . The phrase that scientists often use when predicting solubility is " like dissolves like". This expression means that DISSOLVING occurs when similarities exist between the solvent and the solute. For example : Common salt is a POLAR compound and dissolves readily in polar sovent like water. Non-polar compounds are soluble in non-polar solvents. For example, Fat dissolved in ether. But non-polar compounds, do not dissolve in polar solvents, polar compounds do not dissolve in non-polar solvents. (ii) Effect of Temperature Solubility of Solids in Liquid : Generally, solubility of a solid solute in a liquid solvent increases with increase in temperature. For example, a greater amount of sugar will dissolve in warm water than in cold water. In endothermic process, solubility increases with increase in temperature. In exothermic process, solubility decrease with increase in temperature. Solubility of Gases in liquid : Solubility of gases in liquid decrease with increase in temperature. Generally, water contains dissolved oxygen. When water is boiled , the solubility of oxygen in water decreases , so oxygen escapes in the form of bubbles. Aquatic animals live more in cold regions becuase, more amount of dissolved oxygen is present in the water of cold regions. This shows that hte solubility of oxygen in water is more at low temperatures. (iii) Effect of Pressure : Effect of pressure is observed only in the case of solubility of a gas in a liquid. When the pressure is increased, the solubility of a gas in liquid increases. The common EXAMPLES for solubility of gases in liquids are carbonated beverages, i.e.,soft drinks, households cleanears containing aqueous solution of ammonia, formalinaqueous solution of formaldehyde etc. 
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| 6036. |
A block and tackle system has velocity ratio 3. draw a labelled diagram of the system indicating the points of application and the direction of load L and effort E. A man can exert a pull of 200 kgf. (a) What is the maximum load he can raise with this pulley system if its efficiency is 60% ? (b) if the effort end moves a distance 60 cm, what distance does the load move ? |
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| 6037. |
Name a instrument /device used to measure electric current in a circuit? |
| Answer» SOLUTION :An AMMETER | |
| 6038. |
If the refractive index of glass with respect to air is3/2, what is the refractive index of air with respect to glass? |
| Answer» Answer :B::C | |
| 6040. |
State theprinciple of moments . |
| Answer» Solution :When a NUMBER of like or unlike parallel forces act on a rigid body and the body is in equilibrium , then the algebraic SUM of the MOMENTS in the clockwise direction is EQUAL to the algebraic sum of the moments in the anti - clockwise direction. | |
| 6041. |
A fuse wire is a/an……. . |
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Answer» conductorhavinglow MELTING POINT |
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| 6042. |
.................... is the longest cell in the body. |
| Answer» Solution :Neuron | |
| 6043. |
An electric heater of resistance 8 Omega draws 15A from the service mains for 2hours. Calculate the rate at which heat is developed in the heater? |
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Answer» SOLUTION :Here RESISTANCE of electric HEATER `R=8 Omega`, and current DRAWN by heater `I=15A` `therefore` Rate at which heat is developed in the heater =`I^2R=(15)^2 times 8=1800 W` |
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| 6044. |
A person sitting in a train moving with a constant velocity along a straight line throws a ball vertically upwards, then the ball will |
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Answer» full onwards the TRAIN |
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| 6045. |
(a) Makea diagramto show howhypermetropiais corrected(b)The near pointof ahypermetropic eyeis 1 m. Whatis thepowerof thelensrequiredto correctthisdefect? Assumethatthenear pointof the normaleyeis 25 cm . |
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Answer» Solution :(a)SEE figure13(C) on page 276of THISBOOK . (b)see sampleproblemonpage277of thisbook . |
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| 6046. |
During a gamma-decay , the atomic number and mass number of the radioactive nucleus will ___________. |
| Answer» SOLUTION :REMAIN the same | |
| 6047. |
State the rule to determine the direction of a :[i] Magnetic field produced around a stralghtconductorcarrying current . [ii] Force experiencedby a current-carrying straight conductorplaced in a magneticfield perpendicularto it, and [iii] Current induced in a coil due to its rotation in a magnetic field. |
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Answer» SOLUTION :i] Right-hand THUMB RULE. II] Fleming.s left-hand rule. iii] Fleming.s right-hand rule. |
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| 6048. |
A student sitting on the last bench can read the letters written on the blackboard but is not able to read the latters written in his text book.Which of the following statements is correct? |
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Answer» The near point of his eyes has receded away |
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| 6049. |
Instrument through which the water in cooling tower is circulated in the thermal power plant |
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| 6050. |
Dietary fibre-found mainly in fruits, vegetables, whole grains and legumes- is probably best known for its ability to prevent or relieve constipation. But foods containing fibre can provide other health benefits as well, such as helping to maintain a healthy weight and lowering your risk of diabetes, heart disease and some types of cancer. Dietary fibre, also known as roughage or bulk, includes the parts of plant foods your body can't digest or absorb. Unlike other food components, such as fats, proteins or carbohydrates- which your body breaks down and absorbs- fibre isn't digested by your body. Instread, it passes relatively intact through your stomach, small intestine and colon and out of your body. Which food items provide rich fibre content? |
| Answer» Solution :FRUITS, VEGETABLES, whole grains and LEGUMES give RICH AMOUNT of dietary fibre. | |