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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.
| 8551. |
Define electric wrrent. Name the particln that constitute electric current flowing through the metallic wires. |
| Answer» SOLUTION :The flow of electric CHARGES across a cross-section of a conductor in unit TIME constitutes an electric CURRENT. Electrons. | |
| 8552. |
Specific heat of an object : c :: Latent heat of a substance : ______ |
| Answer» Solution :Specific heat of an object is DENOTED by c. SIMILARLY, LATENT heat of a substance is denoted by L. | |
| 8553. |
Draw the symbols of the following. Battery |
Answer» SOLUTION :
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| 8554. |
Active transport involves |
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Answer» movement of MOLECULES from LOWER to higher concentration |
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| 8555. |
The phenomenon of light responsible for the working of the human eye is |
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Answer» Reflection |
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| 8556. |
A coil of insulated copper wireis connected to a galvanometer. Whathappensif a bar magnet is [i] pushed intothe coil [ii] withdrawnfrominside the coil [iii] held stationary inside the coil ? |
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Answer» SOLUTION :i] if a bar MAGNET is pushed into the coil of insulated copper wire, galvanometershows a deflection as CURRENTIS INDUCED in the coil. ii] Whenthe bar magnetis withdrawn form the coil, currentis induced and hence, the galvanometeragain shows a deflection but in the opposite direction. iii] Whenthe bar magnet is heldstationaryinside the coil, the galvanometerdoes not showany deflection as there is no induced current. |
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| 8558. |
Assertion: Two resistors connected in series, the total resistance is greater than the highest of the individual resistance. Reason: In series connection current in each resistor is same. |
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Answer» if both the assertion and the reason are TRUEAND the reason is the correct explanation of the assertion. |
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| 8559. |
Explain generation of electricity in a thermal power plant. |
| Answer» Solution :Large AMOUNT of fossil fuels are burnt everyday in power stations to heat up water to produce STEAM which further runs the turbine to generate ELECTRICITY. Many thermal PLANTS are set up near coal or oil fields. In these plants fuel is burnt to produce heat energy which is CONVERTED into electrical energy. | |
| 8560. |
If a car at rest accelerates uniformly to a speed of 144km/h 20 s, it covers a distance of |
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Answer» 400M |
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| 8561. |
State theuniversal law of gravitation and derive its mathematical expression . |
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Answer» Solution :This law states that EVERY other particle of matter in this universe attracts every other particle with a force. This force is directly proportional to the product of their masses and inversely proportional to the square of the distance between the centres of there masses. The direction of the force acts along the line joining the masses. Derivation: Let m, and m, be the masses of two bodies A and B PLACED at r metre apart in space. ForceF `propM_(1)xx m_(2) F prop (1)/(r^(2)` On combining the above two expressions `F prop(m_(1)xxM_(2))/(r^(s)),F=(Gm_(1)xxm_(2))/(r^(2))` Where G is the universal gravitational constant. Its value is SI unit is `6.674 xx 10^(-11) Nm^(2)kg^(-2)` |
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| 8563. |
Define critical mass. |
| Answer» Solution :The minimum mass of fissle material necessary to SUSTAIN chain REACTION is called ..critical mass (m)... It dependson the NATURE density and the size of FISSILE material. | |
| 8564. |
Ideal gas equation for n mole of gas |
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Answer» PT = nRV |
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| 8565. |
Draw the diagram of an electric circuit in which the resistors R_(1), R_(2) and R_(3) are connected in parallel aincluding an ammeter and a voltmeter and mark the direction of the current. |
Answer» SOLUTION :
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| 8566. |
Give the examples of each. Disease endagering the social health. |
| Answer» SOLUTION :AIDS, T.B., CANCER, ETC. | |
| 8567. |
On what basis and how are the orbits of artificial stellites classified? Low earth orbits: |
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Answer» Solution :Depending on the height of the satellite 's orbit above the earth's surface , the satellite orbits are classified as below : (a) If the height of the satellite orbit above the earth'ssurface is between 180 km and 200 km , the orbits are called low earth orbits. (b) They complete one REVOLUTION in around 90 minutes. (c) The satellites used for scientific experiments and atmosheric studies revolve in low earth orbist. International Space Station and HUBBLE telescope also revolve in low earth orbits. |
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| 8568. |
Two resistors with resistance of 10 Omega and 15 Omega are connected to a battery of 12V so as to obtain and measure (i) minimum electric current, (ii) maximum electric current . (a) State the mode of connecting the resistors in each case with the help of a circuit diagram. (b) Calculate the strength of total electric current in the circuit in each case. |
Answer» SOLUTION :(a) To obtain MAXIMUM electric current the resistors should be connected in series as shown in diagram (a) TO obtain maximum electric current the resistors should be connected in parallel as shown in diagram (B)  (b) In series ARRANGEMENT `R_s=R_1+R_2=10+15=25 Omega` `therefore` CIrcuit current `I_(MIN)=V/R_s=12/25=0.48 A` In parallel arrangement `1/R_p=1/R_1+1/R_2=1/10+1/15=(3+2)/30=5/30=1/6 implies R_p=6 Omega` `therefore` Circuit current `I_(max)=V/R_p=(12 V)/(6 Omega)=2A` |
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| 8569. |
The reciprocal of electrical resistivity is called ……………….. . |
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| 8570. |
Derive an expression for the excess pressure inside a liquid drop. |
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| 8571. |
State and derive the perfect or ideal gas equation. |
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Answer» Solution :(i) When the pressure of gas is kept constant, the volume of gas is directly proportional to the temperature of the gas. (i.e.,) `V prop T` `V/T` = constant . (ii) The ideal gas equation is an equation , which relates all the PROPERTIES of an ideal gas. An ideal gas obeys Boyle.s LAW, Charles. law and Avagadro.s law, PV = constant `""....(1)` According to Charles.s law, `V/T` = constant `""(2)` According to Avagadro.s law, `V/n= "constant"....(3)` After combining EQUATIONS (1),(2) and (3) `(PV)/(nT) = "constant"...(4)` The above RELATION is called combined law of gases. If you consider a gas, which contains `mu` moles of the gas , the number of atoms contained will be equal to `mu` times the Avagandro.s number , `N_A` (i.e,) `n = muN_A` using equation (5) equation (4) can be written as `PV//muN_AT` = constant The value relation is called combined law of gases. If you consider a gas, which is called as Boltzmann constant `(1.38xx10^(-23)"J K "^(-1)).` Hence , we have the following equation, `PV//muN_A T =k_B` `PV=muN_Ak_BT` Here `muN_Ak_B=R`. which is termed as universal gas constant whose value is `8.31 " Jmol"^(-1)K^(-1)` `PV = RT` Ideal gas equation is also called as equation of sate because it gives the relation between the state variables and it is used to describe the state of any gas. |
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| 8572. |
What kind of energy conversion sustain the water cyclein nature ? |
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Answer» Solution :Water cycle and conversation of energies : 1) The sun heats water in oceans and seas. Then water evaporates as water vapour inot the air. Here potential energy converts into kinetic energy. 2) Rising air currents take the vapour up into the atmosphere. There cooler temperature cause it to condense into clouds. Here kinetic energy converts into potential energy. 3) Air currents move water vapour around the globe, cloud particles collide, GROW and fall out as rain. Here potential energy converts into kinetic energy. 4) Run off and ground water are stored as FRESH water in lakes. Some precipitation FALLS as snow or HAIL. Here kinetic energy converts into potential energy. |
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| 8573. |
State two reasons each of conserving a) forest and b) Wildlife |
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Answer» Solution :a) forest : • It help in retaining the sub- soil water • It checks flood B) Wildlife • To MAINTAIN ECOLOGICAL equilibrium • To protect the nature |
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| 8574. |
Define biomass. Give three examples. |
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Answer» Solution :The dead PARTS of PLANTS, trees, and waste MATERIALS of animalsare called BIOMASS. e.g. wood, ANIMAL dung, agricultural waste. |
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| 8575. |
Kreb's cycle takes place in |
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Answer» Chloroplast |
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| 8576. |
A pencil when dipped in water in a glass tumbler appears to be bent at the interface of air and water. Will the pencil appear to be bent to the same extent, if instead of water we use liquids like, kerosene or turpentine. Support your answer with reason. |
| Answer» Solution :No. Refraction is ASSOCIATED with the bending of a light ray when it moves from ONE transparent medium to another. Since the velocity of the light ray depends on the medium through which it travels, refraction can also be associated with the speed of light in a GIVEN PAIR of MEDIA. This value is different for different pair of media. | |
| 8577. |
What is lake tapping ? Why it takes place ? |
| Answer» Solution :A lake TAP involves excavating a tunnel at the bottem of the lake. Dynamites areplanted therein and blasted carefully. The water flows with greater force through the tunnel after such blasting is DONE. This increased flow of water is then driven to the hydroelectric power generation plant for increased electricity production. This technique is done to establish waterways for hydropower, for making drinking water available, for irrigation water purposes and also for the landing of oil and gas POPES from OFFSHORE fields. | |
| 8578. |
Which of these helps in reducing stress ? |
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Answer» Laughing |
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| 8579. |
Which of the following helps us in stress management |
| Answer» ANSWER :A | |
| 8580. |
The eye defect's presbyopia' can be corrected by |
| Answer» Answer :D | |
| 8581. |
Differentiate convex lens and concave lens. |
Answer» Solution :(i)  (ii) When a BEAM of while light or composite light is refracted through any transparent MEDIA such as glass or WATER. It is split into component colours. This PHENOMENON is called as .dispersion of light.. |
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| 8583. |
Firewood is a conventional fuel. Ling any four reasons for replacing it with alternate sources of energy. |
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Answer» Solution :(i) Wood has calorific value as COMPARED to other SOURCES of fuel. (II) It causes air POLLUTION on burning. (iii) Cutting down of trees causes depletion of forest leading to imbalance in nature. (iv) Only 8-10% energy of burning firewood utilised and the remaining is wasted. |
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| 8584. |
Draw the magnetic field lines (including field directions) of the magnetic field due to a circular coil of current. Name any two factors on which the magnitude of the magnetic field due to this coil depends. |
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Answer» Solution :MAGNETIC field lines have been drawn in Fig. 13.4. The magnetic field depends on (i) amount of current FLOWING, (ii) radius of COIL, and (iii) number of TURNS in the given circular coil. |
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| 8585. |
(a) What is an electromagnet ? List any two uses.(b) Draw a labelled diagram to show how an electromagnet is made.(c) State the purpose of soft iron core used in making an electromagnet.(d) List two ways of increasing the strength of an electromagnet if the material of the electromagnet is fixed. |
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Answer» Solution :(a) An electromagnet is a solenoid COIL with a soft iron CORE. On passing current through solenoid it behaves as a magnet and on stopping current flow the MAGNETISM is lost. Electromagnets are used in electric door bell, transformer, electric cranes etc. (b) A labelled diagram showing how an electromagnetic is made is DRAWN here :  (c) The purpose of soft iron core used in making an electromagnet is to increase the strength of magnetic field. (d) Strength of an electromagnet can be INCREASED (i) by winding greater number of turns in solenoid coil and (ii) by increasing the current I flowing through the solenoid coil. |
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| 8586. |
Name the type of lens used to obtain (i) an erect, enlarged and virtual image of an object, (ii) an erect, diminished and virtual image of an object. |
| Answer» SOLUTION :(i) A CONVEX LENS, (II) A CONCAVE lens. | |
| 8587. |
Myopia : Image in friont of retina : : Hypermetropia : ……………. . |
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| 8588. |
What is sound? Is it a force or energy? |
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Answer» Solution :(i) Sound is a VIBRATION that typically propagates as an audible wave of pressure, through a TRANSMISSION medium such as a GAS, liquid or SOLID. (ii) Sound is not a FORCE, it is an energy. |
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| 8589. |
Mention the role of iris in the human eye. |
| Answer» Solution :IRI controls the size of the pupil and hence REGULATES the AMOUNT of light ENTERING the eye. | |
| 8590. |
Two identical resistors each of resistance 10 ohm are connected in(i) series, (ii) parallel to a battery of 6V. Calculate the ratio of power consumed by the combination of resistor in the two cases. |
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Answer» Solution :`R_(1) = R_(2)=10 Omega` (i) When connected in series `R_(s)=R_(1)+R_(2)= 20 Omega` (ii) When connected in PARALLEL `R_(p)= (R_(1)R_(2))/(R_(1)+R_(2))= (10xx10)/(10+10)=5 Omega` `P_(p)= (V^(2))/(R_(p))=(6xx6)/(5) = 7.2 ` W `(P_(s))/(P_(p))= (1.8W)/(7.2W)=(1)/(4)= 1:4` |
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| 8591. |
Draw symbol of : (i) Rheostat, (ii) Volbneter, (iii) Electric bulb |
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Answer» Solution :(i) RHEOSTAT (ii) VOLTMETER (iii) ELECTRIC bulb 
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| 8592. |
The work done by a fielder when he takes a catch in a cricket match is negative. Explain |
| Answer» SOLUTION :The FIELDER APPLIES force opposite to the direction of DISPLACEMENT of the ball. | |
| 8593. |
The dimensions of intensity of wave are |
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Answer» `[ L° M T^(–3)]` `=[(McancelL^(2)T^(-2))/(cancelL^(2)T)]=[MT^(-3)]=[ML^(@)T^(-3)]` |
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| 8594. |
(a) (i) Calculate the number of molecules in 10 mole of H_(2).(11) Calculate the number of moles in 1 kg of CaCO_(3)(iii) Calculate the volume of 14 g of N_(2) gas. |
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Answer» Solution :(i) n - 10 mole, `N_(A)=6.023xx10^(23)` NUMBER of MOLECULES =`10xx6.023xx10^(23)` W = 1 kg = 1000 g M = 100 g `mol^(-1)`In-? `n=(W)/(M)=(1000)/(100)=10mol` (iii)28 g (1 mole) of `N_(2)` gas OCCUPIES 22.4 litres 14 g of `N_(2)` gas occupies `(22.4)/(28)xx14=(22.4)/(2)` =11.2 litres |
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| 8595. |
Assertion : Weight is a vector quantity. Reason : Direction of weight is always towards the centre of the earth. |
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| 8596. |
Heartis mmade up of____ muscle . |
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Answer» cardiac |
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| 8598. |
How could the sign convention be take ? |
| Answer» SOLUTION :The potential difference across the resistor is taken as NEGATIVE when MOVE along the direction of electric CURRENT through the resistor, and it is taken as positiive when we move against the direction of electric current through the resistor. | |
| 8599. |
Use your brain power : Animals like whale , walrus live in water (ocean). Are they included in Pisces or Mammalia ? |
| Answer» SOLUTION :Whale and walrus are aquatic and marine MAMMALS. They do not belong to class Pisces . They do not have gills to BREATHE in dissolved OXYGEN in water . Neither they have scales on the body not can they lay eggs. Whales and walrus have mammary glands like all other mammals . They give birth to live young ONE. They breathe only with the help of lungs by putting their nostrills out of the water at surface. Hence they are included in Mammalia. | |
| 8600. |
A body is moving along a circular path.How much work is done by the centripetal force? |
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