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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.
| 6552. |
Voluntary and involuntary actions. |
Answer» SOLUTION :
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| 6553. |
a) Explain why, a stick half immersed in water appears to be bent at the surface. Draw a labelled diagram to illustrate your answer. b) A coin in a glass tumbler appears to rise as the glass tumbler is slowly filled with water. Name the phenomenon reponsible for this effect. |
| Answer» Solution :B) Refraction of LIGHT (as it comes out from WATER into AIR). | |
| 6554. |
m-RNA : Transcription :: t-RNA : ……. |
| Answer» SOLUTION :TRANSLATION | |
| 6555. |
Name two safety measures commonly used in electric circuits and appliances. |
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Answer» Solution :i] Electricfuse : When connected in series, it protectsthe CIRCUIT from overloading and shortcircuiting. II] EARTHING : Proper earthing ensures thatleakage CURRENTIS transferredto the ground and PREVENTS the possibility of people getting an electric shock. |
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| 6556. |
Complete the following sentence: (a) Mechanical advantage=_____xxvelocity ratio (b) In class II lever, effort arm is ____than the load arm. (c) A pair of scissors is a ____multiplier. |
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Answer» (b) longer (C) SPEED |
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| 6557. |
What is meant by potential difference between two points ? |
| Answer» Solution :Potential difference between two POINTS in an ELECTRIC field is the amount of work done to move a unit CHARGE from ONE point to other. | |
| 6558. |
Based on initial and final energy of the light beam , classify the scattering. |
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Answer» Solution :Based on INITIAL and final ENERGY of the LIGHT beam , scattering can be classified as, (i) Elastic scattering (ii) Inelastic scattering |
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| 6559. |
Which colour of light has a higher critical angle? Red light or Green light. |
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| 6560. |
It takes time for pieces of Shahabad tile to disappear in HCI, but its powder disappears rapidly. |
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Answer» Solution :(1) The rate of a reaction depends upon the SIZE of the PARTICLES of the reactants taking part in the reaction. The smaller the size of the reactants particles, the more is their total surface AREA and the faster is the rate of reaction. (2) In the reaction of DIL. HCl with pieces of Shahabad tile, `CO_(2)` effervescence is formed and the tile disappears slowly. On the other hand, `CO_(2)` effervescence forms at faster rate with Shahabad tile powder and it disappears rapidly. |
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| 6561. |
(a) What is the frequency of violet colourof wavelength 4000 A^@ ? (b) What is the What is the frequency of red colour of wavelength 8000 A^@ ? |
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Answer» SOLUTION :(a) `V = ( c)/(lamda) = (3 xx 10^8)/(4000 xx 10^-10) = 7.5 xx 10^14 HZ` (B) `v = ( c)/(lamda) = (3 xx 10^8)/(8000 xx 10^-10) = 3.75 xx 10^14 Hz`. |
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| 6562. |
Which has more resistance: a] A long piece of nichrome wire or a short one? b] A thick piece of nichrome wire or a thin piece? |
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Answer» Solution :a] A LONG PIECE of nichrome WIRE. b] A THIN piece of nichrome wire. |
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| 6563. |
Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} Out of water and kerosene, which is optically denser and why ? |
| Answer» Solution :Kerosene is OPTICALLY denser as COMPARED to water because its REFRACTIVE index is more than that of water. | |
| 6564. |
Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} Name the medium in which light travels with a smallest speed. |
| Answer» SOLUTION :LIGHT travels with a smallest speed in diamond because REFRACTIVE index of diamond is MAXIMUM. | |
| 6565. |
Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} If speed of light in free space is 3 xx 10^(8) ms^(-1), then in a rock salt crystal light travels with a speed : |
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Answer» `1.95 xx 10^(8) MS^(-1)` |
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| 6566. |
Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} Relative refractive index of Ruby with respect to alcohol is |
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Answer» 1.71 |
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| 6567. |
Different ways to obtain thermal energy : |
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Answer» Solution :(i) In THERMAL power plants COAL is burned to obtain the thermal ENERGY . (ii) In power plants based on nuclear energy fission of nuclei of atoms LIKE uranium or plutonium is used to generated the thermal energy . (III) In solar thermal power plants the thermal energy is obtained from the solar thermal power plants the thermal energy is obtained from the solar radiations. |
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| 6568. |
Show, with the help of a diagram, the nature of field lines of magnetic field around a current carrying straight conductor. |
Answer» SOLUTION :
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| 6569. |
The root mean square speed of the molecules of a gas is |
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Answer» INDEPENDENT of its PRESSURE but directly proportional to its Kelvin temperature |
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| 6570. |
Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. Why is life thereatened on the earth due to global warming? |
| Answer» SOLUTION :Global warming is CAUSING CLIMATE change, which brings about frequent natural disatere, food and WATER insecurity and THEREFORE life is threatende. Many species are already extinct. | |
| 6571. |
Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. What is the chain of impacts caused due to global warming? |
| Answer» Solution :Global WARMING causes rise in temperature which RESULTS in melting of GLACIERS, sea level rise and COASTAL submergence. | |
| 6572. |
Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. What can we do to reverse effects of climate change? |
| Answer» SOLUTION :We have to control the emissions of green HOUSE GASES, plant more trees follow sustaninable LIVING PRACTICES. | |
| 6573. |
Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. Which are main green house gases? |
| Answer» SOLUTION :Carbon dioxide, METHANE, nitrous oxide and ozone are MAIN GREEN house gases. | |
| 6574. |
Our atmosphere is getting hotter, more turbulent, and more unpredictable because of the ''boiling and churning'' effect caused by the heat-trapping greenhouse gases within the upper layers of atmosphere. With increase of carbon, methane, or other greenhouse gas levels in the atmosphere, our local weather and global climate is further agitated, heated, and ''boiled''. The green house gases such as water vapour, carbon dioxide methane, nitrous oxied, and ozone are causing great impact on life on earth. Due to global warming, the glaciers are melting, causing sea level rise, coastal submergence and frequent natureal disasters. We have to rethink while taking the development projects and help to protect the existing life forms on the earth before its too late because climate change can exetrminate us. Why is there increased global warming? |
| Answer» Solution :Because the GREEN house GASES are emitted in more proportion, there is global warming due to TRAPPING of SOLAR HEAT. | |
| 6575. |
Bandharas and Tals are age old water harvesting concepts/structures found in |
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Answer» Bihar |
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| 6576. |
A battery of 9V is connected in series with resistors of 0.2Omega,3Omega,0.4Omega and 12Omega respectively. How much current would flow through the 12Omega resistors ? |
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Answer» Solution :`R= 0.2+0.3 +0.4 +0.5 +12 = 13.4 Omega` `I =(V)/(R) = (9)/(13.4) =0.67 A ` SINCE, all resistors are in SERIES hence the current in 12` Omega` RESISTOR will also be 0.67 A. |
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| 6577. |
What are the applications of convace lens? |
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Answer» Solution :(i) CONCAVE LENSES are used as eye lens of Galilean TELESCOPE (II) They are used in wide angle spy hole in doors. (III) They are are used to correct the defect of vision called myopia |
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| 6578. |
Say True or False.g is called universal constant. |
| Answer» SOLUTION :False. G is called acceleration DUE to GRAITY. | |
| 6579. |
In the simple electric motor of figure given below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil. Is the current flowing clockwise or anticlockwise around the coil when viewed from above ? |
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| 6580. |
What is dispersion of light ? |
| Answer» Solution :SPLITTING of light into its component colours on PASSING through a dispersive mediumeg. a prism. | |
| 6581. |
(a) Draw magnetic field lines around a current-carrying straight conductor. (b) A compass needle is placed near a current-carrying straight conductor. State your observation for the following cases and give reasons for the same in each case :(i) Magnitude of electric current is increased. (ii) The compass needle is displaced away from the conductor. |
Answer» Solution :(a) See  (B) (i) On increasing the ELECTRIC current strength of MAGNETIC field increases and hence DEFLECTION of compass needle increases. (ii) If the compass needle is displaced away from the current-carrying conductor, the magnitude of deflection decreases on account of DECREASE in strength of magnetic field. |
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| 6582. |
Electrical energy generation and environment. |
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Answer» Solution :Electrical energy generation and its effects on the environment depend on the process that is used to produce the electrical energy . a. ELECTRICITY generation using fossil fuels : BURNING of fossil fuels like coal natural gas lead to emission of harmful gases like CARBON monoxide, nitrogen dioxide causing air pollution. Gases such as carbon dioxide , nitrogen dioxide produced during the burning of fossil fuels lead to environmental hazards such as global warming and acid rain. Soot particles generated DUE to incomplete PROBLEMS like asthma. Thus, electricity generation using fossil fuels is not environmental friendly. b. Electricity generation using nuclearfules : Improper nuclear-waste storage and disposal result in environmental contamination. Accidental leakage of nuclear radiation can lead to lethal disaster. Thus , electricity genration using nuclear fuel is not environmental friendly. c.Electricity generation using green energy sources : Electricity generation using sources like water reservoir, wind sunlight , bio-fuel etc. that are perptual does not cause any pollution. Thus electricity generaion using these green energy sources is environmental friendly. ii. Considering the merits and demerits of all the above processes the world is now heading towards environmental friendly energy i,e green energy. |
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| 6583. |
Light rays when travellingfrom Benzeneto Air bends …………………. . |
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Answer» Solution :LIGHT rays when travelling OBLIQUELY from Benzene to Air, bend `ul("away from the normal")`. Generally, when light rays travel obliquely from DENSER MEDIUM to RARER medium, it bends away from the normal as the velocity increase after entering air. Benzene is a denser medium, while air is the rarer medium. Velocity of light in benzene is less than that in air. |
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| 6584. |
A body weight 250N on the surface. Assuming the earth to be a sphere of uniform mass density, how much would it weight half way down to the centre of earth |
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Answer» 240 N |
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| 6585. |
Heat produced in any resistor is directly proportional to the resistance of the ____________. |
| Answer» SOLUTION :RESISTOR | |
| 6586. |
How many electrons pass through a lamp in one minute, if the current is 300 mA ? |
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Answer» SOLUTION :`I=300mA=300xx10^(-3)A` `t="1 minute"=60s` `E=1.6xx10^(-19)C` `I=(q)/(t)=("ne")/(t)` `N=(It)/(e)=(300xx10^(-3)xx60)/(1.6xx10^(-19))=1.125xx10^(20)` |
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| 6587. |
An electrical iron uses a power of 1100 W when set to higher temperature. If set to lower temperature, it uses 330 W power. Find out the electric current and the respective resistances for the two settings.The iron is connected to a potential difference of 220 V. |
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Answer» Power used at HIGHER temperature `(P_(1))=1100W,` Power used at LOWER temperature `(P_(1))=1100W,` Power used at lower temperature `(P_(2))=330W`. `"To find:i.Electric current "(I_(1))" at higher temperature."` `"iiElectric current "(I_(2))" at lower temperature"` `"iii.Resistance "(R_(1))" at higher temperature"` `"iv.Resistance "(R_(2))" at lower temperature"` `"Formulae:i.P = VI.ii.V = 1 R"` CALCULATION : For higher temperature, From formula (i), `I_(1)=(P_(1))/(V)=(1100)/(220)=5A` From formula (ii), `R_(1)=(V)/(I_(1))=(220)/(5)=44Omega` For lower temperature, From formula (i), `I_(2)=(P_(2))/(V)=(330)/(220)=(3)/(2)=1.5A` From formula (ii), `R_(2)=(V)/(I_(2))=(220)/(1.5)=(220)/((3//2))` `=(220xx2)/(3)=(440)/(3)=146.67Omega` |
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| 6588. |
Indicate the graph showing the variation of specific heat of water with temperature . What does it signify? |
Answer» Solution :The variation of specific heat of water with the temperature is as shown in the graph . From the graph , we find that at`T=15^(@)C` , specific heat of water, `S=1 " calg"^(-1).^(@)C^(-1)` At `T=0^(@)C,S=1 .008"Calg"^(-1).^(@)C^(-1) " the hight est and at " T = 30 ^(@)C,s = 0.9976 "Calg"^(-1).^(@)C^(-1),` of water increases slightly with rise in temperature . At`T=100^(@)C` , specific heat of water is`1.0057"cal"g^(-1).^(@)C^(-1)`. It signifies that the specific heat of water DECREASES with increase in temperature from`0^(@) " to "30^(@)C` and increases from`30^(@)-100^(@)C`. |
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| 6589. |
What are impulsive forces? Give examples. |
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| 6591. |
Why are hormones called chemical messenger? |
| Answer» Solution :The endocrine system ACTS through chemical MESSENGERS known as HORMONES produced by the endocrine glands. Various physiological processes such as digestion, METABOLISM, GROWTH, development and reproduction are controlled by hormones. | |
| 6592. |
Derive an expression for electric energy consumed in a device in terms of V, l and t, where V is the potential difference applied to it, l is the current drawn by it and tis the time for which the current flows? |
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Answer» Solution :We know that work done = W = QV `:. P = (W)/(t) ` Now `P = (QV)/(t)` V=IR `:. P =(Q)/(t) IR =I^(2) R` ENERGY `=P xxt` `= I^(2) R xxt` `=(V)/(R^(2)) RT` `=(V^(2))/(R) t ` Energy `=(V^(2))/(R) t` Where V = voltage R = resistance , t = time . |
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| 6593. |
Two magnetic field lines never intersect each other. Why? |
| Answer» Solution : Intersection of MAGNETIC field lines at a point means that the COMPASS needle WOULD point towards TWO directions at that point, which is not POSSIBLE. | |
| 6594. |
Why are decomposition reaction called the opposite of combination reactions ? Write equations for these reactions. |
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Answer» Solution :In decompositon reaction, a SINGLE COMPOUND splits to give rise to two or more simple substance. In combination reaction, two or more simpler substance combine together to FORMA single compound. Hence they are opposite to each other . Example of decomposition reactions : `underset("Copper carbonate")(CuCO_(3(s))) overset("HEAT")to underset("Copper oxide")(CuO_((s))) + underset("Carbondioxide")(CO_(2(g)))` Example of combination reaction. `underset("Magnesium")(2Mg_((s))) + underset("Oxygen")(O_(2(g))) overset("heat")to underset("Magnesium oxide")(2MgO_((s)))` |
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| 6595. |
Enlist and discuss Some symbols are givenbelow. Find the meaning of those symbols in relation to environment conservation. Make a list of other such symbols. |
Answer» SOLUTION :
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| 6596. |
The stars twinkle but the planets do not twinkle at the night because : |
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Answer» the STARS are SMALL but the planets are LARGE |
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| 6597. |
Consider a circular loop of wire lying in the plane of the table, Let the current pass through the loop clock-wise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop. |
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Answer» Solution :Inside the loop = Pierce inside the table Outside the loop = APPEAR to emerge out from the table. For downward dierction of current FLOWING in the circlar loop, the DIRECTION of magnetic field from the table loop. Similary, for upwards direction of current flowing in the circular loop. the direction of magenetic field lines will be as if they are emerging from the table outside the loop and merging in the table inside the loop, as shown in the GIVEN FIGURE. 
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| 6598. |
Obtain an expression for the heat produced in a conductor when a voltage V is applied across it. Heating effect of electric current is desirable as well as undesirable. Explain this statement. |
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Answer» Solution :Refer chapter for derivation. Heating effect of ELECTRIC current is used in many applications such as electric bulb, electric FUSE, coils of HEATERS and boilers, etc. Hence, it is desirable. However, it undesirable in many cases because: a] When electric current is passed through any DEVICE,, a part of it is used to heat the device. This leads to unnecessary loss of energy b] In many devices overheating CAUSES improper functioning and may sometimes damage the device. |
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| 6599. |
Which product of the nuclear fission of uranium-235 is utilised to cause further fission of its nuclei ? |
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| 6600. |
What is the dew point temperature ? |
| Answer» Solution :When UNSATURATED is (of specific VOLUME ) at a CERTAIN temperature is taken and its temperature is DECREASED, a temperature is reached at which the air becomes SATURATED with vapour. This temperature is called the dew point temperature | |