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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.
| 4451. |
d Distinguish between natural acids and mineral acids. Give few examples of each.een natural acids and mineral acids. Cive few examples of each. |
| Answer» <p>The main difference between mineral acid and organic acid is that mineral acids are inorganic compounds composed of different chemical element combinations whereas organic acids are organic compounds essentially composed of carbon and hydrogen atoms. ... There are two main types of acids as strong acids and weak acids</p> <p>oganic acids are those which contain carbon along with other functional groups. Like, CH3COOH or acetic acid or Ethanoic acid, is an organic acid as it contains carbon. Organic acid may contain other functional groups along with carboxylic group.</p><p>Now mineral acids do not contains carbon. Or we can say that mineral acids are inorganic acid. Some examples are hydrochloric acid (HCl), Nitric acid(HNO3), Sulfuric acid(H2SO4) etc.</p> <p>Please write in points</p> <p>Write in 4 points</p> | |
| 4452. |
22. Which of the following gases is not present 2in coal gas?(A) Hydrogen(B) NitrogenC) Methane(D) Carbon monoxide |
| Answer» <p>Coal gas contains Hydrogen,carbon monoxide and methane in major quantities.</p><p>Nitrogen is also present in minor quantities.</p><p>But according to the question.Best answer is Option B - nitrogen.</p> | |
| 4453. |
I Collect information about the spacemissions undertaken by SunitaWilliams. |
| Answer» <p>prepare a chart giving detailed information of carbon compound in everyday use display it in the class and discuss</p> <p>prepare a chart giving detailed information of carbon compound in everyday use display it in the class and discuss</p> <p>sunita WIlliams stayed in the space for 36 days.</p> | |
| 4454. |
An aqueous solution contains an unknownconcentration of Ba2+. When 50 mL of a1 M solution of Na,SQ4 is added, BaSOjust begins to precipitate. The final volumeis 500 mL. The solubility product of BaSO4is 1x 10-10. What is the originalconcentration of Ba2+?(1) 5x10-9 M(2) 2x10-9 M(3 1.1x 10-9 M |
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| 4455. |
How is anodizing of aluminium carried out? |
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| 4456. |
wo blocks of 7 kg and 5 kg are connectedeavy rope of mass 4 kg. An upward force of 2applied as shown in the diagram. The tent the top of heavy rope at point P is:g = 10 m/s2)200N7kgboooooo4kg5kg) 2.27 N(2) 112.5 N (3) 87.5 N(4) 3 |
| Answer» <p>Given,</p><p>Mass of top block (m1) = 5 kg</p><p>Mass of lower block (m2) = 7 kg</p><p>Mass of rope (mw) = 4 kg</p><p>The total mass of the system (m) = 5+ 4+ 7</p><p> 16 kg</p><p>Force = 200 N</p><p>total downward force = mg</p><p> = 16 × 10</p><p> = 160 N</p><p>thus, the correct option is B</p><p>the accereleration of the system,</p><p>According to the equation</p><p>F=ma</p><p>=> F - mg = ma (g= 10 m/s^2</p><p>=> 200 - 16 × 10 = 16 a</p><p>=> 200 - 160 = 16 a</p><p>=> 40/16 = a</p><p>=> 2.5 = a</p><p>∴ acceleration of the system = 2.5 m/s^2The tension at the top of the heavy rope is of mass</p><p>mass = 5+ 4 = 9 kg</p><p>a = 2.5 m/s^2</p><p>T= ma + mg</p><p> =m (a+ g)</p><p> = 9 × 12.5</p><p> = 112.5 N</p><p>Tension at the midpoint of the rope,</p><p>m = 4 kg</p><p>T = m(a +g)</p><p> = 4 × 12.5</p><p> = 50 N</p><p>Tension at the lower endpoint of the rope</p><p> m = 7kg</p><p>T = m (a+g)</p><p> = 7 × 12.5</p><p> = 87.5 N</p> <p>87.5 N is the right answer</p> <p>87.5 N is the right answer </p> | |
| 4457. |
ockea Satelite in its orbit. Nane the tuaoe acig on the ockt inmnaciadldocket immeter lcavaunchi |
| Answer» <p>There aretwo forces actingon arocketatthemoment of lift-off:Thrust pushesthe rocketupwards by pushing gases downwards intheopposite direction. Weight isthe forcedue to gravity pullingthe rocketdownwards towardsthe centre oftheEarth.</p> | |
| 4458. |
According to figure the reading of the spring baiance will be(all contacts are smooth) [ g 10 m/s*]2m/s(A) 6 kg f(B) 5 kg f(C) 60 N(D) 60 kg f10kg5kg30 Fxea |
| Answer» <p>in vertical direction , gravitational force + pseudo force will be there , => Fv = mg +ma = 10*(10+2) = 120N </p><p>now force along the inclined surface = Fvsin∅ = 120/2 = 60N , = reading in spring </p><p>so , reading in the spring = 6kgf </p><p>option A</p> <p>option C is also ans...</p> <p>option C is also ans...</p> | |
| 4459. |
What are the different states inwhich water is found during thewater cycle? |
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| 4460. |
If the image formed by a spherical mirror for all positions of the object placed in froof it is always erect and diminished, what type of mirror is it ? Draw a labelledrdiagram to support your answer. |
| Answer» <p>thnk you so much</p> | |
| 4461. |
dimensions.16. Let I = current through a conductor, R = its resistanceand V = potential difference across its ends. Accordingto Ohm's law, product of two of these quantities equalsthe third. Obtain Ohm's law from dimensional analysis.Dimensional formulae for R and V are ML'I T andML,T-3「1 respectively. |
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| 4462. |
\frac { 20 \times 1 \cdot 03 } { V \times 10 } \times 31 \cdot 61 |
| Answer» <p>2*1.03*31.61</p><p>= 2.06*31*61</p><p>= 65.1166</p> | |
| 4463. |
B)Definei) Antibioticsi) Metamorphosisiii) Mycelium) Mineralizationv) Entomology.isthe bro |
| Answer» <p>antibiotics: the drugs are produced by micro organism which inhibit the growth kill of micro organism are called antibiotics ex: penicillin</p> | |
| 4464. |
How does the process of fertilisation take place in flowe |
| Answer» <p>what is zygote</p> | |
| 4465. |
Newton's law of gravitation states that the magnitude of force between two particles of mass m1 and m2 separated by a distance r is given byF=G \frac{m_{1} m_{2}}{r^{2}} |
| Answer» <p>Newton's law of universal gravitation states that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.</p> <p>Thanks 😊</p> | |
| 4466. |
A-6. The centre of mass of a system of particles is at the origin. From this we conclude that(A) The number of particles on positive x-axis is equal to the number of particles on negative x-axis(B) The total mass of the particles on positive x-axis is same as the total mass on negative x-axis(C) The number of particles on X-axis may be equal to the number of particles on Y-axis.(D) f there is a particle on the positve Xaxis, there must be at least one particle on the negative X-axis |
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| 4467. |
ensity and frequengThe whole coastline of India is vulnerable to cyclones both in terms of intthe cyclones:(a) particularly the east coast(c) Both the east and the west coastof(b) particularly the west coast(d) the south coast |
| Answer» <p>Cyclones are usually formed in the seas or oceans..... since the coastal areas are close to the sea, it is more vulnerable to cyclones....... The Eastern coast of India is more vulnerable to cyclones.....</p> | |
| 4468. |
what is acid rain |
| Answer» <p>Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals and infrastructure.</p> <p>it is a form of precipitation. it is very harmful to animals and plants. the main cause is the industrial burning coal or any other fossil fules</p> <p>Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals and infrastructure.</p> <p>rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids.Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions. It can have harmful effects on plants, aquatic animals and infrastructure.</p> <p>rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids</p> <p>rainfall made so acidic by atmospheric pollution that it causes environmental harm, chiefly to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulphur and nitrogen oxides which combine with atmospheric water to form acids.</p> | |
| 4469. |
histing of fibres makes fibre(b) Soft(d) Longer & strongerStrong and sofe |
| Answer» <p>strong and soft </p> | |
| 4470. |
Acid rain caused due to the large number of oil refineries and industries around this areareacts with the marble of this monument, making it dull and pale.2.Acid rain seeps through the fissures in the rock, severely damaging and rapidly eroding manyof these impressive sculptures and paintings.This huge monument has been exposed to acid rain caused by industrialisation and heavyvehicle emissions. As a result, its marble panels have chemically transformed into softgypsum.4.Acid rain has led to the loss of silicate mineral in the marble columns of this memorial. Due tothis, the marble has become weak.Industrial expansion has led to acid rain that has begun to erase almost 25% of rock area withthe most sensitive areas of artwork.KnowThe biggest contributor toacid rain is the burning of fossilfuels by coal-burning powerplants, factories and automobiles |
| Answer» <p>1 . Taj Mahal ( India)</p> <p>2. Longman Grottoes ( China)3. Acropolis of Athens ( Greece)4 . Jefferson Memorial ( USA )5. Dampier Rock Art Complex ( Australia)</p> | |
| 4471. |
2. In Activity 13.7, how do we think the displacement of rod AB will beaffected if (i) current in rod AB is increased; (ii) a stronger horse-shoemagnet is used; and (iii) length of the rod AB is increased? |
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| 4472. |
ow can exposure to ultraviolet rays be harmful? |
| Answer» <p>UV rays can also damage the eyes as more than 99% of UV radiation is absorbed by the front of the eyes. Corneal damage, cataracts, and macular degeneration are all possible chronic effects from UV exposure and can ultimately lead to blindness. Melanoma, a type of skin cancer, can also develop within the eye.</p> <p>but for answer thank you</p> | |
| 4473. |
cm acias and bases.e products formed in a neutralisation reactiont Explain neutralisationreaction with the help of an activity. |
| Answer» <p>A neutralization reaction is a a chemical reaction, in which an acid and a base interact with each other. The result of this reaction is the formation of a salt and water.</p> <p>Answer in detail please</p> <p> Eg: If sulphuric acid is reacted with calcium hydroxide, the products are water and the ionic salt calcium sulphate. </p> | |
| 4474. |
What harmful products are formed by the burning of fuels? |
| Answer» <p>The important harmful effects produced by the burning of fuels are: 1)The burning of fuels like wood,coal and petroleum products releases unburnt carbon particles in the air:These fine carbon particles are dangerous pollutants which can cause respiratory diseases.</p> <p>thanks</p> | |
| 4475. |
Complete the following reactions:(i) CH3-CH2 + PC15-→онCH3(ii)CH3-C--X+NaOH→CH3 |
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| 4476. |
3. Match the terms given under Column A withthose given under Column B :Column A(a)Sleeping sickness(b) MercuryColumn B(i) Non-renewableresource(ii) Human factorengineering(iii) Light waves(iv) Protozoa(v) Elusive planet(c) Soil(d) Ergonomics(e) Fibre optics |
| Answer» <p>sleeping sikness _ protozoa</p> <p>mercury _ light waves</p> <p>(a)-4 (b)-5 (c)-1 (d)-3 (e)-2</p> <p> This is the answera-4 b-5 c-1 d-3 e-2.</p> | |
| 4477. |
. Equal weights of two gases of molecular weight 4 and 40 are mixed. The pressure of the mixture is 1.1atm. The partial pressure of the light gas in this mixture is(1) 0.55 atm(2) 0.11 atm(3) 1 atm(4) 0.11 atm |
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| 4478. |
Define Trisngle law |
| Answer» <p>Triangle lawof vector addition states that when two vectors are represented by two sides of atrianglein magnitude and direction taken in same order then third side of thattrianglerepresents in magnitude and direction the resultant of the vectors.</p> | |
| 4479. |
denslya density2 A plas yinder of length 12 x 104 m and area of cTOss-section 5 x 104 m2 has a2500 km It is immersed in a liquid of density 1500 kgm, such that g of its length is abonliquid. Find the apparent weight of glass cylinder in newtons.2. A glass cy[g10 N/kg] [0.9375 |
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| 4480. |
Define angular dispacement, angular velocityand angular acceleration. |
| Answer» <p>Angular displacement of a body is the angle in radians through which a point revolves around a centre or line has been rotated in a specified sense about a specified axis.</p><p>Angular velocity, also called rotational velocity, is a quantitative expression of the amount of rotation that a spinning object undergoes per unit time. It is a vector quantity, consisting of an angular speed component and either of two defined directions or senses.</p><p>Angular acceleration is the rate of change of angular velocity. In three dimensions, it is a pseudovector. In SI units, it is measured in radians per second squared, and is usually denoted by the Greek letter alpha.</p> | |
| 4481. |
Two blocks of equal mass m are tied to each otherthrough a light string. One of the blocks is pulled alongthe line joining them with a constant force F. Find thetension in the string joining the blocks. |
| Answer» <p>Thanks </p> | |
| 4482. |
Money can be sent anywhere through electonicmeans |
| Answer» <p>it means that now these days we have many apps in our mobile phones to send money to other people by their mobile numbers. The most popular apps are - 1: Paypal2: Google pay3: Cash app4: Zelleand last but not the least5: Venmo</p> | |
| 4483. |
what is solstice |
| Answer» <p>noun</p><p>noun:solstice; plural noun:solstices</p><p>either of the two times in the year, thesummer solsticeand thewinter solstice, when the sun reaches its highest or lowest point in the sky at noon, marked by the longest and shortest days.</p><p>Origin</p><p></p> <p>Asolsticeis an event occurring when the Sun appears to reach its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Twosolsticesoccur annually, around June 21 and December 21. The seasons of the year are determined by reference to both thesolsticesand the equinoxes.</p> | |
| 4484. |
5. Give the relation connecting particle nature and wave nature of electron. |
| Answer» <p>1</p> <p>2</p> <p>3</p> <p>4</p> | |
| 4485. |
The bleaching properties of H,O, are due to) Reducing roperties(2) Oxidising nature(3) Unstablility nature(4) Acidic nature |
| Answer» <p>Bleaching action of hydrogen peroxide:It acts as bleaching agent due to the release of nascent oxygen.H2O2→H2O + OThus, the bleaching action of hydrogen peroxide is permanent and it is due tooxidation. It oxidises the colouring matter to a colourless product.Colouring matter + O→Colourlessmatter.</p> <p>what is nacent oxygen??</p> | |
| 4486. |
What are the common products of organic farming in Sikkim? |
| Answer» <p>Important Organic Cash Crops of Sikkim. Important organically grown cash crops of the state are oranges, large cardomom,ginger,turmeric, cherry paper, baby corn, buck heat, pulses etc. All these organic crops have a high demand in domestic and international markets</p> | |
| 4487. |
33. A lift is moving up with an acceleration equal toatdue to gravity. The apparent weight of a 60 kg man stin lift is |
| Answer» <p>See , when the lift is accelerating upwards ,</p><p>Suppose uniform upward acceleration of the man in lift = a</p><p>hence , net upward force on the man , F = ma & the reation offered be R</p><p>Itss clear That ,R-mg = F</p><p>hence , R = m(g+a) , this is the expression for apparent weight , now on putting the given values</p><p>R = 60* ( g + g/5 ) = 60 * 12 = 720Kg wt</p> <p>but it's ans is 72 kgwt</p> | |
| 4488. |
In two vessels A and B, the milk and water are in the ratio of 3:4 and 2:3respectively. The ratio in which these are mixed to obtain new mixture which contains milkand water in the ratio 20:29 is |
| Answer» <p>milk in A=4/7 water in A=3/7 let x quantity of mixture from A be added to Cmilk in B=2/5 water in B=3/5 let y quantity of mixture from B be added to Chence,milk added from a + milk from b= 4x/7+2y/5water added from a + water from b= 3x/7+3y/5these two shud be equal as ratio in c is same for milk nd watertherefore,(4x/7+2y/5)/(3x/7+3y/5)=1on solving,x/7=y/5or x:y=7:5</p> | |
| 4489. |
6. If the unit of length and force be each increasedfour times, show that the unit of energy in increased bysixteen times |
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| 4490. |
Classify the objects or materials given below as opaque, transparenttranslucent and luminous or non-luminousor2.Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, asheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of rediron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon pa |
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| 4491. |
12) Atomic number of oxygen is 8 find out its valency and valence electrons. |
| Answer» <p>valency is 2 and Valene shell electron is 6</p> <p>configuration of oxygen is 2,2,4hence 4 Valence electrons and valency is 2</p> | |
| 4492. |
A stone weighs 25 N in air and 12 N whenimmersed in water. The magnitude of buoyant forceacting on the stone in water is |
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| 4493. |
Rearrange the boxes given below to make a sentence that helpsopaque objects.1.ow Ss M |
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| 4494. |
Classily the objects or materials given below as opaque, transparenanslucent and luminous or non-luminous:rwater, a piece of rock, a sheet of aluminium, a mirror, a wooden boet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon |
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| 4495. |
Fill in the blanks.1) A proton has_charge.2)Q.8.13is the atomic number of calcium.3) Total number of periods and groups in the modern periodic table areQ.9.Answer the following questions.1) What are valence electrons? How many valence electrons are there in nitroge2) Write the electronic configuration of Aluminium and Sodium. |
| Answer» <p>1.valence electrons are the electrons present in outermost shell of an atom to form a chemical bond. nitrogen has 5 valence electrons. </p> <p>8. 1) A proton has a positive charge. 2) 20 is the atomic number of Calcium. 3) The number of periods is 7 and no of groups is 18 in the modern periodic table.9. 1) Valence electrons are the number of electrons in the outermost shell of an atom. Nitrogen has 5 electrons in its outermost shell. 2) Aluminium(13) electron configuration: 2 8 3 Sodium(11) electron configuration: 2 8 1</p> | |
| 4496. |
28. What is evaporation? In what way is it different from filing? Give any two differences? |
| Answer» <p>Evaporation is a process where liquid turn into vapor. Example is “water evaporated from the soil”</p><p>Boiling means rapid vaporization of any liquid. It happens when a liquid is heated to its boiling point. The boiling occurs in three different stages such as nucleate boiling, transition boiling and film boiling.There are no stages for evaporation.</p> <p>There arenostages forevaporation.Boilingoccurs whenthetemperature oftheliquid is greater thanthe boilingpoint ofthesubstance.Evaporationcan occur atanytemperature. ...Evaporationoccurs at room temperature and therefore, occurs at a slower rate when compared toboiling</p> | |
| 4497. |
Which of the following is/are not always necessary to observe a shadow?(a) Sun(b) Screen(c) Source of light(d) Opaque object |
| Answer» <p>a) sun is the correct option </p> | |
| 4498. |
B. Write T for True or F for False.I. The system that controls the other systems is called the respiratorysystem |
| Answer» <p>falseit is the nervous system that controls other systems too</p> | |
| 4499. |
0.02+ 0.00+0.01+0.01004-0.04THEORYWhat is the need for measurement of a physicquantity?What is meant by unit of a physical quantity?State different types of systems of units.What is S.I. system of units? Explain its nond |
| Answer» <p>1. There is aneed for measurementinphysical quantity. Without it , how can you define things. Bymeasuringaphysical quantitywe define the properties of a material which thephysical quantityis associated with. For example, distance, speed, mass, pressure, force, momentum, energy.</p> <p>(i) They aredefinedas theunitsof fundamentalquantities. They are independent of each other and are expressed by writing the letter of the fundamentalquantityin parentheses, e.g., Fundamentalunitsof mass, length and time are [M], [L], [T] respectively</p> <p>The current international standard metric system is the International System of Units (Système internationald'unitésor SI) </p><p>It is an mks system based on the metre, kilogram and second as well as thekelvin, ampere, candela, and mole. The SI includes two classes of units which are defined and agreed internationally.</p> | |
| 4500. |
Describe respiratory Systemsofdifferentanimals |
| Answer» <p>Direct Diffusion</p><p>For small multicellular organisms, diffusion across the outer membrane is sufficient to meet their oxygen needs. Gas exchange by direct diffusion across surface membranes is efficient for organisms less than 1 mm in diameter. In simple organisms, such as cnidarians and flatworms, every cell in the body is close to the external environment. Their cells are kept moist and gases diffuse quickly via direct diffusion. Skin and Gills</p><p>Earthworms and amphibians use their skin (integument) as a respiratory organ. A dense network of capillaries lies just below the skin and facilitates gas exchange between the external environment and the circulatory system. The respiratory surface must be kept moist in order for the gases to dissolve and diffuse across cell membranes.</p><p>Tracheal System</p><p>Insect respiration is independent of its circulatory system; therefore, the blood does not play a direct role in oxygen transport. Insects have a highly specialized type of respiratory system called the tracheal system, which consists of a network of small tubes that carries oxygen to the entire body. The tracheal system is the most direct and efficient respiratory system in active animals. The tubes in the tracheal system are made of a polymeric material called chitin.</p><p>Mammalian Systems</p><p>In mammals, pulmonary ventilation occurs via inhalation (breathing). During inhalation, air enters the body through thenasal cavitylocated just inside the nose (Figure 1). As air passes through the nasal cavity, the air is warmed to body temperature and humidified. The respiratory tract is coated with mucus to seal the tissues from direct contact with air. Mucus is high in water. As air crosses these surfaces of the mucous membranes, it picks up water. These processes help equilibrate the air to the body conditions, reducing any damage that cold, dry air can cause. Particulate matter that is floating in the air is removed in the nasal passages via mucus and cilia. The processes of warming, humidifying, and removing particles are important protective mechanisms that prevent damage to the trachea and lungs. Thus, inhalation serves several purposes in addition to bringing oxygen into the respiratory system.</p> | |