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12651.

When a gas expands through ∆V at constant pressure P. What is the work done?

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Work done dW = P.dV

12652.

The velocity of a particle is \mathbf{v}=6 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-2 \hat{\mathbf{k}}. Thecomponent of the velocity parallel to vector\mathbf{a}=\mathbf{i}+\hat{\mathbf{j}}+\hat{\mathbf{k}} in vector form is\begin{array}{ll}{\text { (a) } 6 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}+2 \hat{\mathbf{k}}} & {\text { (b) } 2 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}+2 \hat{\mathbf{k}}} \\ {(c) \hat{\mathbf{i}}+\hat{\mathbf{j}}+\hat{\mathbf{k}}} & {\text { (d) } 6 \hat{\mathbf{i}}+2 \hat{\mathbf{j}}-2 \hat{\mathbf{k}}}\end{array}

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12653.

A force of 5 kg wt. acts on a body for 10 seconds. If the velocity varies at 5 m/s due to force, themass of the body is -

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We know thatChange in velocity = accelerationand F= Magiven

12654.

mgFind reading of spring balanceNote: Spring balance reads thrust of body which is read in kg-wt.1kg5kgsics

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The reaction in the spring balance will be the sum of the tension in the string having 1kg (t1) amd 5kg (t2) each.

now for tension. 10-t1 = -1a.....(1)and , 50-t2 = 5a.....(2)

and also a = (50-10)/6 = 40/6 =(20/3)m/s² putting a in 1 and 2t1 = 10+20/3 = 50/3N and t2 = 50-100/3 = 50/3 N

so, the spring shows t1+t2 = 2*(50/3) = 100/3 N.

12655.

16., A monoatomic gas at a pressure P, having a volume 20V expands isothermally to a volume 2V and thenadiabatically to a volume 16V. the final pressure ofthe gas is: (take y 5/3)[AIPMT-2014]

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12656.

2. Write the atomicity of the following molecules;il) ccl) H2SOAlam tho liing component common to both the complex p

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1)Atomicityis defined as the number of atoms in a molecule. Hence theatomicityof H2S will be 3 as it contains two hydrogen and one atom of Sulphur. Similarly theatomicity of H2SO4is seven as it has 2 hydrogen, one Sulphur and 4 atoms of oxygen.2) Similarly atomicity of ccl4 is 5

12657.

(4) ab22 gm: of CO2 at 27° C is mixed with 16 gm. of O,at 37C. The temperature of the mixture is:-(1)31.16°C(3) 37°C42.(2) 27° C(4)30° C

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No of moles of CO2= mass/molar mass = 22/44= 0.5 mole

No of moles of O2= 16/32 = 0.5 mole

Since both have same no. of moles, the resulting temperature will be the average of both their temperatures.

...The temperature of the mixture is = (27+37)/2 =32oC

12658.

tensions in the string when passing through two positions atA particle is moving in a vertical circle. Theangles 30° and 60° from downward vertical are T, and(A) T1 = T2(D) Tension in the string always remains the sameT 2 respectively. Then[Orissa JEE 2002](B) T2 > T(C) T> T2

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12659.

19. Divide 150 into three parts such that the second number is five-sixtühs the first and the thinumber is four-fifths the second.

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12660.

If a body looses half of its velocity on penetrating3 cm in a wooden block, then how much will itpenetrate more before coming to rest?10.[JEE mains 2002](1) 1 cm(3) 3 cm(2) 2 cm(4) 4 cm

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option 1

12661.

. if a body loses half of its velocity on penetrating 3 cm in a wooden block, then how much will t penetratemore before coming to rest?(1) 1 cm(2) 2 cm(3) 3 cm(4) 4 cm

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With penetrating 3 cm block,

v^2/4 = v^2 – 2a*3

3v^2/4 = 6a

v^2 = 8a.........(1)

Now,

0^2 = v^2 – 2ax.......(2)

put (1) in (2)

x = 1 cm

net distance would be => 1 + 3 =4cm

12662.

A body weighs 72 N on surface of the earth. When itis taken to a height of h 2R, where R is radius ofearth, it would weigh(1) 36 N(3) 9 N1.(2) 18 N(4) 8 N

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value of g at h = 2R = g'= g*h²/(h+R)²= g*4R²/(9R²) = 4g/9

so, weight would be 72/g*4g/9 = 36N

12663.

34.10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given sotake 20 mL of the same solution of NaOH, the amount of HCI solution (the same solutionto neutralise it will be(a) 4 mL(b) 8 mL(c) 12 mL(d) 16 ml

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12664.

A 10 g sample of KCIO, gave on completedecomposition , 2.24 L of oxygen at STP. What isthe percentage purity of the sample of potassiumchlorate?3'

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2KClO3 ---> 2KCl + 3O2Therefore, 2 mol of KClO3 gives 3 mol of O2122.5 g of KClO3 gives 22.4X 3 L of O210 g of KClO3 = 0.081 mol (approx.)2.24 L of O2 = 0.1 molif 3 mol of O2 is obtained from 2 mol of KClO30.1 mol of O2 is obtained from 2/3 X 0.1 = 0.06 mol of KClO3Therefore, amount of pure potassium chlorate in sample = 0.06 mol% age purity = 0.06 / 0.081 X 100 = 74.07%

12665.

\sqrt [ 3 ] { 6 } \times \sqrt [ 3 ] { 6 } \times \sqrt [ 3 ] { 6 } =

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as cube root of 6 is multiplied three times so we get 6 as answer

12666.

A.ะก.gr ZTKala-azar is caused by which micro-organismA. Plasmodium2B. leishmaniaC. AmoebaD. of these

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Leishmania

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12667.

17. What is oxidation ?I8. Mammals and birds have four chambered heart. Why ?16x2=32IV Answer the following quesitons:19. 2A of electric current is passed through bulb for 5 minutes calculate the amount of electric chargesflowing through the bulb.ir oridised during aerobic respiration.

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We have given :

I (current)= 2 A,

T(time)=5min = 5*60 sec=300sec,

We have to calculate q (electric charge)

We have formula :

Current = flow of charge / unit time

I = q / t

q = I * t

q = 2 A * 300 sec

q = 600 A / sec

Or

q = 600 coloumb.

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12668.

A block of wood floats in water with 4/5 th of its volumesubmerged, but it just floats in another liquid d. Thethe dense city of the liquid is (in kg/m3)(1) 750(3) 1000(2) 800(4) 1250

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12669.

A capillary tube of radius r is immersed in a liquidand mass of liquid, which rises up in it is M. If theradius of tube is doubled, then the mass of liquidwhich will rise in capillary tube will be(1) 2 M(3) MI2(2) M(4) MI4

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12670.

(7) A steel wire having cross sectional area 1mm2 isstretched by 10 N. Find the lateral strainproduced in the wire(Given : Ysaeel-2 x 10" N/m, σ-0.291)

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12671.

7. Two persons pull a rope towards themselves.person exerts a force of 100 N on the rope. FindYoung modulus of the material of the rope if it extin length by 1 cm. Originał length of the rope 2mthe area of cross section = 2 cm

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12672.

2. A vertical metal cylinder of radius 2 em 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 m

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12673.

30. । लट्ट को घुमाना किसका एक उदाहरण है ?(A) केन्द्राभिमुख बल (Centripetal Force)(B) अपकेंद्री बल (Centrifugal Force)(C) गुरुत्वाकर्षण बल (Gravitational Force)(D) घर्षण बल (Frictional Force)

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A) Centripetal force

this answer is centripetal force

centripetal force righ ans

ans is centripetal force

a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.

centripetal force is the answer .

12674.

' an and Rahul were riding in a motorcar that wasmoving wihit the windshield and got stuck on the winand Kiran started pondering over the situathat the insect suffered a greater change icompared to the change in momentunmthe change in the velocity of the insect was much more thancity on an expressway when an insectdscreen. Akhtartion. Kiran suggestedof the motorcar (becauset of the motorcar). Akhtar said that since the motorcar wasmoving with a larger velocity, it exerted a larger forinsect. And as a result the insect died. Rahul while putting anentirely new explanation said that both the motorcar and theinsect experienced the same force and a change in theirComment on these suggestions.

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12675.

7. Akhtar. Kiran and Rahul were riding in a motorcar that wasmoving with a high velocity on an expressway when an insecthit the windshield and got stuck on the windscreen. Akhtarand Kiran started pondering over the situation. Kiran suggestedthat the insect suffered a greater change in momentum ascompared to the change in momentum of the motorcar (becausethe change in the velocity of the insect was much more thanthat of the motorcar). Akhtar said that since the motorcar wasmoving with a larger velocity, it exerted a larger force on theinsect. And as a result the insect died. Rahul while putting anentirely new explanation said that both the motorcar and theinsect experienced the same force and a change in theirmomentum. Comment on these suggestions.

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12676.

Which of the following forces is not fundamental force in nature(2) Electromagnetic force(4) Tension.(1) Gravitational forceStrong nucler force

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4) tension

Reason

Other are fundamental force including weak Nuclear force.

force is an push or pull of any object

12677.

what is young modulus

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Young's modulus or Young modulus is a mechanical property that measures the stiffness of a solid material. It defines the relationship between stress and strain in a material in the linear elasticity regime of a uniaxial deformation. Young's modulus is named after the 19th-century British scientist Thomas Young.HIT THE LIKE BUTTON

12678.

whatho plein

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Proteinis an important component of every cell in the body. Hair and nails are mostly made ofprotein. Your body usesproteinto build and repair tissues. You also useproteinto make enzymes, hormones, and other body chemicals.Proteinis an important building block of bones, muscles, cartilage, skin, and blood.

benefits of protein on body?

Hair and nails are mostly made of protein. Your body uses protein to build and repair tissues. You also use protein to make enzymes,hormones, and other body chemicals. Protein is an important building block ofbones,muscles, cartilage,skin, and blood.

disadvantages of protein?

The Risks of High-Protein, Low-Carb Diets

High cholesterol.Someproteinsources -- like fatty cuts of meat, whole dairy products, and other high-fat foods -- can raise cholesterol, increasing your chance of heart disease. ...

Kidney problems. ...

Osteoporosis and kidney stones.

what are the sources of protein?

Some sources of dietary protein include:

leanmeat,poultryandfish.

eggs.

dairy productslikemilk, yoghurt andcheese.

seedsandnuts.

beansand legumes (such aslentilsand chickpeas)

soyproducts liketofu.

12679.

significantfang figures.Theinnumber of16228 109 110

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2 is the correct answer

1.22 * 10^4 contains 3 significant figures

12680.

The mass of a ball is four times the mass of another ball. when these balls are separated by a distance of 10 cm the gravitational force between them is 6.67 x 10^-7 N. Then the mass of each ball in kg is -1) 0.5,2 2) 50,50 3) 2,5 4) 5,20

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12681.

1. What is the significant number of 520.12

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Non-zero digits are always significant.

Any zeros between two significant digits are significant.

significant figure-5

Thanks bro

12682.

how many significant figure present in 2.300 kg?

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It has four significant figures.

but in the case of:the mass of a box measured by bro surveillance is 2. 300 kg. two gold pieces of masses 20.15 gram and 20.17 are added to box then the added in the mass of piece to correct significant figures?

12683.

Elastic wave in solid can be-i longitudinal onlyii transverse onlyiii longitudinal and transverse both

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Only longitudinal, or compression,waves, in which the particles of the medium vibrate in the direction ofwavepropagation, can propagate in liquids and gases, which areelasticwith respect to volume but not with respect to shape.

12684.

can there be potential diffrence b/w 2 neighbouring1 conductors carrying equal tube charges

Answer»

Yes there can beas potential diffrence can be thereas its mentioned that both have positive chargebut magnitude can be differentthanks

12685.

e What are the factors responsible forpollution of the river?

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It increases in day by day. The main causes ofriver pollutionare: Industrial waste: Industries produces large amount of waste which contains toxic chemicals andpollutantssuch as lead, mercury, sulfur etc.

12686.

Cou ge 15 cu. A.UUA convex mirror has a focal length of 20 cm. Find the position of the object for which theimage will be half the size of the object.(Ans. u = -20 cm

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the position of the object for which the image will be half the size of the object is -20 cm

12687.

] 0 Hal) ale o1 \# &ltu& 0L L,Ay 10.0) 54, ८00 ९ o oo € Ha P!{ हि‘Vfi;fl 00

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We know that Resistance = Voltage/currenttotal resistance= 20+10= 30 ohmvoltage = 5vcurrent= 5/30= 1/6 AMPERE

12688.

Why is rainbow usually seen after heavy rainfall

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Rainbows are caused when rays of light from the sun hit water droplets which reflect some of the light back. The water droplets are usually rain drops, but could also be spray from a waterfall, a fountain, or even fog. To see a rainbow, you must have the sun shining behind you and the water droplets in front of you.

Sunlight is made up of a spectrum of different colours that look white when we see them all mixed together. These colours get reflected by slightly different angles inside the raindrop, so they get spread out. This is why we see the familiar colours of the rainbow.

12689.

11. Describe the formation of rainbow in the sky withthe help of a diagram.

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Arainbowis a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc.Rainbowscaused by sunlight always appear in the section of sky directly opposite the sun.

12690.

89.A diatomic molecule has(1) 1 degree of freedom(2) 3 degree of freedom(3) 5 degree of freedom(4) 6 degree of freedom

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there are 3 translational, 2 rotational, and 1 vibrational degree of freedom for a two-atomic molecule. totally 5 degreea of freedom

tan 60°-tan 30°/1+tan 60°×tan 30°

12691.

The exact reason why Shivaji Maharaj died

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Shivaji Maharaj died due to dysentery which is most often caused by shigella bacteria (shigellosis) or an amoeba. Dysentery is often spread through contaminated food or water.

thanks

12692.

reforms of Rajarshi shahu Maharaj in the state of kolhapur

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Chhatrapati Shahu occupied the throne of Kolhapur for 28 years, from 1894 to 1922, and during this period he initiated numerous social reforms in his empireShahu Maharaj is credited with doing much to further the lot of the lowercastesand indeed this assessment is warranted. He also ensured suitable employment for students thus educated, thereby creating one of the earliestAffirmative action(50% reservation to weaker sections) programs in history.

12693.

and Power GravitationMechaChoose the correct answer:Estimate the percentage error in measuring adistance of 10 cm with a metre scale of leastcount 0.1 cmo (-(2)0.5%(3) 1%(4) 0.2%

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thanks

12694.

Q: A galvanometer coil has a resistance of 15Ω and the metre shows ull scale deflection or a currentof 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

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12695.

Q: A galvanometer coil has a resistance of 1 5Ω and the metre shows full scale deflection for a currentf 4 má, Haw will you convert the metre into an ammeter of range 0 to 6 A?

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12696.

1. What do you understand by atmospheit pitu2. What will happen to the human body if the air pressure of an area suddenlydecreases ?

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Depends on the speed and final pressure. Below about 0.3 atmospheres the partial pressure of oxygen is insufficient to sustain life, and consciousness is gradually lost below 0.5 atm if you are not acclimatised. The time of useful consciousness is decreased by more rapid decompression.

12697.

Ametre stick is held vertically with one end on a rough horizontal floor. It is gently allowed to fall on thefloor. Assuming that the end at the floor does not slip, find the angular speed of the rod when it hits thefloor

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12698.

EXAMPLE 38, A metre scale AB is held vertically witk isone end A on the floor and is then allowed to fall. Find thespeed of the other end B tohen it strikes the floor, assumingthat the end on the floor does not slip.

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To find: speed of the other end BSolution:L = length of meterstick = 1 m

h = height of center of mass of meterstick = L/2 = 1/2 = 0.5 m

m = mass of meterstick

w = angular speed just before the stick hits the floor

I = moment of inertia of meterstick = mL²/3

Using conservation of energy

potential energy = rotational kinetic energy

mgh = (0.5) I w²

m g (L/2) = (0.5) ( mL²/3) (v/L)²

mgL = mv²/3

v = sqrt(3gL)

v = sqrt(3 x 9.8 x 1)

v = 5.42 m/s

Answer: Thus the speed of the other end B when striking the floor is : 5.42m/s

12699.

A magnetic needle is kept in a non-unimagnetic field. It experiences

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Magnetic needle is placed in non-uniform magnetic field. It experiences force and torque both are due to unequal forces acting on the poles.

12700.

Let the resistance of an electrical component remains constant whilethe potential difference across the two ends of the component decreasesto half of its former value. What change will occur in the current Ihroughit?

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