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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Science knowledge and support exam preparation. Choose a topic below to get started.
| 4851. |
A car changes its velocity from 30 ms-1 due east to 25ms-1 due south. Calculate the change in its (a) speed,(b) velocityAns. (a) 5 ms-1, (b) 39 ms-1 |
| Answer» <p>The speed would decrease by 5 ms-1. (Speed does not depend on direction).Velocity change must include direction as well:change in velocity = 25 along south - 30 along east.Its magnitude is square root of ( 25 squared + 30 squared) = 39.05 ms-1</p> | |
| 4852. |
(c)Anunknownindicatorturnsgreen in sodium hydroxide solution. Name the indicator-PoeAlso tell what colour does it show in an acidic solution. |
| Answer» <p>China rose is a light pink coloured solution which is extracted from the red flowers of China rose plant with water. Acid turns China rose indicator to magenta and bases turns it to green colour.</p> <p>Example</p> | |
| 4853. |
3. Find the value of :{2018 - 3)} + 5(12-7)INET & HA(b) 25(c) 30(d) 55(a) 5 |
| Answer» <p>{2(18-3)}+5(12-7){2(15)} + 5(5)30 + 25 55</p> | |
| 4854. |
8.Q is 8.A coil of inductance 8.4 mH and resistance 6connected to a 12 V battery. The current in the coil is1.0 A at approximately the time-(1) 500 s (2) 20 s (3) 35 ms (4)1 ms |
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| 4855. |
ower of a heart which pumps 5x 10 cc of blood perminute at a pressure of 120 mm of mercury is:(g -10m s^-2 and density of Hg 13.6x 10 ^3 kg/m^3)(a) 1.36 W(c) 0.136 W(b) 13.6 W(d) 136 W |
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| 4856. |
A body weighs W gf in air and W, gf whencompletely immersed in water then R.D of thebody is:It1s64.1) w - W2)4)3) |
| Answer» <p>Solution:- Relative density = weight in air/weight loss in water</p><p>Relative density = W/(W - W1)option (2) is correct.</p> | |
| 4857. |
4. What happens when atoms combine to form a compound? Explain with an example.s. Write the differences between monoatomic ions and polyatomic ions with the help of example6. Describe the periodic table. |
| Answer» <p>4. When elements react, their atoms join with other atoms to form compounds. Chemical bonds form, which involves atoms transferring or sharing electrons.</p> <p>5. A monatomic ion consists of a single atom that is ionized. For example Na+, Cl-, Fe+3, O-2. A polyatomic ion consists of several atoms bonded to each other, but acting as if it were one ion. ClO3-, NH3+, SO4-2, CO3-2.</p> <p>6. The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends. The modern periodic table consists of 7 horizontal periods and 16 vertical groups ( 18 vertical columns ) . The elements of the modern periodic table are classified into 4 blocks.</p> | |
| 4858. |
Two blocks A and B of mass 10 kg and 40 kg are connected by an ideal string as shown in the figue lleNeglect the masses of the pulleys and effect of friction. (9 10 m/s)on arjoglltFoea |
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| 4859. |
derive an expression for equivalent resistance when number of resistance are connected in series |
| Answer» <p>thanks</p> | |
| 4860. |
How does water form inside the coconut ? What is the colour of the mirror ? |
| Answer» <p>1) Thewaterthatisfound inside the coconut isbasically the endosperm. In a youngcoconutthe endospermisin liquidformwith various nuclei. The liquid contains nutrients. As the coconutgrows, the no of cells grow and they get deposited on the periphery forming the soft, tender white part which we consume.</p> <p>2) As a perfect mirror reflects back all the colours comprisingwhite light, it's also white. That said, real mirrors aren't perfect, and their surface atoms give any reflection a very slightgreen tinge, as the atoms in the glass reflect back green lightmore strongly than any other colour.</p> <p>Thank you so much.</p> | |
| 4861. |
Which of these will make a solution?(a) water +chalk powder(c) water + salt(b) water + oil(d) water + sand |
| Answer» <p>a) no, as chalk in water is a suspensionb) No , as oil not dissolve in waterc) yes, salt dissolve in waterd) No, as sand not dissolve in water</p> | |
| 4862. |
State the sign of the charge acquired by an object when it is charged, bypositively charged rod, through (a) conduction (b) induction.for your statement..Give the reason |
| Answer» <p>a) When charged by conduction, the extra positive charges flow through the object until they reach an equilibrium. Thus it becomes positively charged. </p><p>b) When charged by induction, the negative ions get attracted towards the positively charged body and flow towards one side of the body. The object as a whole remains neutral but the side towards the positively charged object gets negatively charged. </p><p>Please hit the like button if this helped you</p> | |
| 4863. |
the monkey moving with respett o rucC-6. A boy of mass 60 kg is standing over a platform of mass 40 kg placed over a smooth horizontal surfaceHe throws a stone of mass 1 kg with velocity v = 10 m/s at an angle of 45° with respect to the groundFind the displacement of the platform (with boy) on the horizontal surface when the stone lands on theground. (g 10 m/s2) |
| Answer» <p>total mass of body and plateform = 100kg</p><p>conservation of momentum in horizontal direction 100V + 1*10cos45 =0</p><p> V=-1/10√2 m/sec</p><p>negative sign indicates in the reverse direction.</p><p>time of filght = 2*10 sin 45 /10</p><p> = √2</p><p>so in this time plateform will move = V*t</p><p> =1/10√2 *√2</p><p> = .1 m answer</p> | |
| 4864. |
1)Algae3) Viruscs) Bacteria4) Viroids2. The vitamin whose content increasfollowing the conversion of milk into cuby lactic acid bacteria is1)Vitamin C2) Vitamin D4) Vitamin E.3) Vitamin B123. The puffed-up appearance of dough is |
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| 4865. |
ng force of 50 N is applied to a body of mass 2U Kg movingoting on a hody of mass 3.0 kg changes its speed from 2.0 m s5.5A constant retardiinitially with a speed of 15 m st.How long does the body take to stop ? |
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| 4866. |
The rate of mass of the gas emitted from rear of a rocket isinitially 0.1 kg/sec. If the speed of the gas relative to therocket is 50 m/sec and mass of the rocket is 2 kg, then theacceleration of the rocket in m/sec2 is(a) 5 (b) 52 (c) 2.539.(d) 25 |
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| 4867. |
a) During heavy exercise, we get cramps in the legs due to theaccumulation of) carbon dioxide (ii) lactic acidlii) alcohol(iv) water |
| Answer» <p>option 2 lactic acid is the correct answer. </p> | |
| 4868. |
2.At0°Cand760minHgpressureagasoccupiesavolume of 100 cm The Kelvin temperature (absolutetemperature) of the gas increased by one-fifth while thepressure is increased one and a half times. Calculate thefinal volume ofthe gas. (Ans: 80 с.с.) (ICSE 95) |
| Answer» <p>Given</p><p>T1 = 0°C=273k.</p><p> T2=1/5*(273)+273=327.6k</p><p>P1= 760mm.</p><p> P2=760+1/2*(760)=1140mm</p><p>V1= 100cc. V2=?</p><p>using ideal gas eqn.</p><p>P1*V1/T1=P2*V2/T2</p><p>760*100/273=1140*VE/327.6</p><p>On solving V2 will be equal to 80cc</p><p>= 80 cc</p><p>Like my answer if you find it useful!</p> | |
| 4869. |
Explain how the city water works makes river water safe for drinking. |
| Answer» <p>City water works cleans river water by three processes:</p><p>1)Sedimentation: Wastes are separated from water. </p><p>2)Filtration: The wastes, which weren't separated, are separated.</p><p>3)Chlorination : Chlorine is added to water.</p> | |
| 4870. |
A solution of these6 02 103) 48 1 x 102 |
| Answer» <p>Post a clear image !</p> | |
| 4871. |
what will happen if all the decomposers Were suddenly removed from earth |
| Answer» <p>If all the decomposers are removed from ecosystem; 1.Complex organic matter will not be broken and would never be returned to their original pools like soil ,air and water. 2. Nutrient cycles will be disturbed and would soon be exhausted and evolution of life would come to an end.</p> <p>If all the decomposersareremovedfrom ecosystem; 1.Complex organic matterwillnot be broken andwouldnever be returnedtotheir original pools like soil ,air and water. 2. Nutrient cycleswillbe disturbed andwouldsoon be exhausted and evolution of lifewouldcometoan end</p> | |
| 4872. |
10. What do you mean by over loading? Is your home is safe from short circuit.r loading? Is your home is safe from short circuit. How will you justifyyour home is safe from short circuit. |
| Answer» <p>If more electrical appliances of high power rating like electric iron box, electric cooker, electric heater, air conditioner etc., are switched on at the same time, they draw an extremely large current from the circuit is calledoverloading.</p> | |
| 4873. |
2. A vertical metal cylinder of radius 2 cm and length 2 mis fixed at the lower end and a load of 100 kg is put onit. Find (a) the stress (b) the strain and (c) thecompression of the cylinder. Young modulus of the metal- 2 x 10" N m287T 2 |
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| 4874. |
16. Calculate the force of gravitation between the earth and theSun, given that the mass of the earth = 6 x 1024 kg and of theSun = 2 × 1030 kg. The average distance between the two is1.5 x 1011 m. |
| Answer» <p>Thank you so much </p> | |
| 4875. |
15.Illustrate the law of conservaenergy changes which occur when we draw a pendulumbob to one side and allow it to oscillate. Why does the bobeventually come to rest? What happens to its energyeventually? Is it a violation of the law of conservation ofenergy?tion of energy by discussing the |
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| 4876. |
Energy changes always occurs during a physical change |
| Answer» <p>When a substance changes from one state, or phase, of matter to another we say that it has undergone a change of state, or we say that it has undergone a change of phase. For example, ice melts and becomes water; water evaporates and becomes water vapor. These changes of phase always occur with a change of heat.Hence energy changes always occur during a physical change </p> | |
| 4877. |
Formation of manure from leaves is a physical change |
| Answer» <p>FalseFormation of manure is a chemical change</p> | |
| 4878. |
ss the effects of deforestation on the following(a) Wild animalsb) Environment(c) Villages (Rural areas)(d) Cities (Urban areas)(e) Earth(f) The next generation |
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| 4879. |
दिन :गृहकार्य विवरण What is Periodic motion ? GiveI an example |
| Answer» <p>Periodic motion is a type of motion that repeats itself. For example, motion of earth around the sun is periodic because earth completes a full revolution in one year and continues to revolve.</p> <p>periodic motion is a type of motion that repeats itself.eg motion of earth</p> <p>Periodic motion is themotion that isrepeated in equal intervals of time.The two instances of periodic motionthat is effective in measuring time are:example -1) Rotation of the earth around its axis ( 24 hours)2) Revolution of the earth around the sun ( 365 1/4 days)</p> | |
| 4880. |
stinguish between the following1. Distinguish(a) Physical change and chemical change(b) Periodic change and non-periodicchange(c) Natural change and man-made change |
| Answer» <p>Physical changerefers to achangein which the molecules are rearranged but their internal composition remains same.Chemical Changeis a process in which the substance transforms into a new substance, havingdifferent chemicalcomposition.</p> <p>Physical change refer to a change in which the molecules are arranged but their internal conceptions remain same chemical changes the process in which substance transform into new substance having different chemical composition.</p><p>hope this will help you like my answer and MARK IT AS BEST ANSWER.</p> <p>Achemical changeresults from achemical reaction, while aphysical changeis when matterchangesforms but notchemicalidentity. Examples ofchemical changesare burning, cooking, rusting, and rotting. Examples ofphysical changesare boiling, melting, freezing, and shredding.</p> <p>Achemical changeresults from achemical reaction, while aphysical changeis when matterchangesforms but notchemicalidentity. Examples ofchemical changesare burning, cooking, rusting, and rotting. Examples ofphysical changesare boiling, melting, freezing, and shredding.</p> <p>physical changes are the changes..in which can be reversed and no new substance is formed...whereas the chemical changes are the changes in which a new substance is formed and that can't be reversed..</p> <p>the. change in which no new substance is formed is called physical change.the change in which a new substance is formed is called chemical change. </p> <p>physical change is a change in which the molecules of a substance remains same . Chemical change is a change in which substance Change into new substance</p> | |
| 4881. |
The objective and eyepiece of an astronomicaltelescope are 60 cm apart. If the magnifying powerof telescope is 19, find the focal lengths of both the5)) |
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| 4882. |
state ange oi visibleandelect vomagrewave which aivevisihle effect |
| Answer» <p>Thevisible spectrumis the portion of theelectromagnetic spectrumthat isvisibleto thehuman eye.Electromagnetic radiationin this range ofwavelengthsis calledvisible lightor simplylight. A typicalhuman eyewill respond to wavelengths from about 390 to 700nanometers.In terms of frequency, this corresponds to a band in the vicinity of 430–770THz</p> | |
| 4883. |
A father is 30 years older than his son. In 12 years, the man will be three times as old s his son. Findpresent ages. |
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| 4884. |
A field is in the form of a rhombus. The diagonals of the field are 70 m and 80 m.Find the cost of levelling it at the rate of 23 per sq. m. |
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| 4885. |
A wooden cube floats inside water with a200 gm mass placed on it. When the mass isRemoved, the cube floats with its top surface 2 omthe water level. What is the side of the cube ?2) 8 cm |
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| 4886. |
CAFor Class 6 to 83.Why is there a difficulty in breathing at high altitudes? |
| Answer» <p>When webreathein airatsea level,theatmospheric pressureofabout 14.7 pounds per square inch (1.04 kg. per cm.2) causes oxygen to easily pass through selectively permeable lung membranes intotheblood.At high altitudes,thelower air pressure makesitmoredifficultfor oxygen to enter our vascular systems.</p> | |
| 4887. |
If the position vector changes from (1,2,3) m to (54.2) m then displacement vector is4i +2j-kB) i-5j+4kc) i+j+4kD) i-j+k |
| Answer» <p>Displacement vector= (5-1)I+(4-2)j+(2-3)k4i+2j-kplease like the solution 👍 ✔️</p><p>and please check previous Answer as well</p> | |
| 4888. |
(b) A lemon kept in water in a glass tumbler appears to be bigger than its actual size, when vfrom its sices. Explain why it so appears? |
| Answer» <p>A lemon kept in a glass tumbler containing water would appear larger in size due to refraction of light. As light travels from air (rarer) to water (denser) medium, it bend towards the normal.</p> | |
| 4889. |
a natural phenomenon based on dispersion of light. |
| Answer» <p>The phenomenon of splitting white light into seven colours when it passes through a glass prism is called dispression of white light .example : Formation of rainbow</p> <p>shortcut</p> | |
| 4890. |
A tank with length 10 m, breadth 8 m and depth 6m is filled with water to the top. If g = 10 m s-2 anddensity of water is 1000 kg m, then the thrust on the bottom is (neglect atmospheric pressure)(A) 6 x 1000 x 10 x 80 N(C) 3 x 1000x 10x 6O NA-2(B) 3 x 1000 x 10 x 48 N(D)3 x 1000 x 10 x 80 N |
| Answer» <p>Thrust = p*A = 1/2*(density×g×volume) => T = 1/2*1000×10×(10×8×6) = 1/2×6×1000×10×80N</p><p>option D</p> | |
| 4891. |
Questions-1) Write the difference between.GymnospermsAngiosperms2 |
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| 4892. |
. How do gymnosperms andangiosperms differ from eachother? |
| Answer» <p>Ans :- Angiospermsvs.Gymnosperms. Angiosperms, also calledflowering plants, have seeds thatareenclosed within an ovary (usually a fruit), whilegymnosperms have no flowers or fruits, and have unenclosed or “naked” seeds on the surface of scales or leaves.Gymnosperm seedsareoften configured as cones.</p> <p>thanks</p> | |
| 4893. |
t. Who first used the term "Gymnosperms'? |
| Answer» <p>Gaston first used the term gymnosperms</p> | |
| 4894. |
An ore of iron isa) haematite (b) bauxite |
| Answer» <p>a) is correct</p><p>The iron minerals that are at present used as ores are hematite, magnetite, limonite, and siderite; also, occasionally ankerite, goethite, and turgite. Hematite is the most important iron ore.</p> | |
| 4895. |
state anae of visible band of elect so mawve which qive visible cffect |
| Answer» <p>Thevisible spectrumis the portion of theelectromagnetic spectrumthat isvisibleto thehuman eye.Electromagnetic radiationin this range ofwavelengthsis calledvisible lightor simplylight. A typicalhuman eyewill respond to wavelengths from about 390 to 700nanometers.In terms of frequency, this corresponds to a band in the vicinity of 430–770THz.</p> | |
| 4896. |
An electric heater which is connected to a 220 V supply line has two resistance coils A and B of 24 Ωresistance each. These coils can be used separately (one at a time), in series or in parallel. Calculate thecurrent drawn when(a) only one coil A is used.(b) coils A and B are used in series.(c) coils A and B are used in parallel |
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| 4897. |
7 boys in a cricket team scoredmore than 20 runs while the 4 otherboys scored less than 20 runs. Inthe opposite team, 5 boys scoredexactly 30 runs and the 6 otherboys scored less than 30 runs. Howmany boys were there in eachcricket team? |
| Answer» <p>There were 11 boys in each team</p> | |
| 4898. |
A dog of mass 25 kg running after a cCalculate the ratio of the velocities of the two.32.at of mass 4 kg possesses the same kinetic energy as that of the cat.ho ttork done hy thenumn. |
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| 4899. |
ED EXAMPLES15. Two particles of mass 100 g and 300 g have, at a given time,positions 21+51 + 13h and-6a + 44-2écm respectively andvelocities 10+ -3 and T-9 + 6k em s-1 respectively.Deduce the instantaneous position of the centre of mass |
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| 4900. |
Differentiate between Flat File database and Relational database. |
| Answer» <p>Flat File&Relational Database. Aflat file databasestores data in a single table structure. Arelational databaseuses multiple table structures, cross-referencing records between tables. Tables in both organize records in rows, with each column containing a single piece of data in the record</p> | |