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7701.

The Sun's angular diameteris measured to be 1920. The distance D ofthe Sun from the Earth is 1.496 x 10^11 m.What is the diameter of the Sun ?

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7702.

A wheel having a diameter of 3 m starts from restand accelerates uniformly to an angular velocityof 210 r.p.m. in 5 seconds. Angular accelerationof the wheel isradrad(A) 1.4T 2(B) 3.3mradrad(D) 1 . I π(C) 2.2Ts2.

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4.4 rad/s is the answer. The option is missing!

Instead of 1.4 rad/s, it is 4.4 rad/s

7703.

A particle, moving along a circular path hasequal magnitudes of linear and angularacceleration. The diameter of the path is (inmetre):(A) 1(C) 2Q.15(B) π(D) 2πQuestions

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7704.

a flywheel of mass 500 kg and 1m diameter make 500 Revolutions per minute . assuming the mass to be concentrated along the rim. calculate angular velocity , moment of inertia , energy of the flywheel

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7705.

low moths of certain families are able to escapecapture from a bat.[CBSE-2014

Answer»

The moths are very sensitive to hear the high frequency squeaks of bats, thus they fly away from that place and escape from the bats.

7706.

Which vitamin is to be given to the patient suffering from mouth cracks atcorners?

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Riboflavin, or vitamin B-2 is to be given to the patient suffering from mouth cracks at corners.

7707.

!the following velocity-time graph of a body.ctdistance and displacement travelled by the bod5 second in meters will be-4030-20-1003075 11545, 75(8) 105, 75(D) 95, 55)

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Displacement = area under the curve = 1/2*(20*2) + (20*2) + (1*20) + 1/2*(20*1) - 1/2*(30*1)= 20 + 40 + 20 +10 - 15= 90-15= 75

and distance = 90+15 = 105

option B

7708.

31.A body is projected upwards with a velocity u. Itpasses through a certain point above the groundaftert, second. The time after which the body passesthrough the same point during the return journey is(2) 2G)(3) 31(4) 3t

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7709.

011. When a white light passes through a prism. some colours get refracted more than the othersExplain whyOR

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These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange,yellow,green,blueand violet. The separation of visible light into its different colors is known as dispersion.

7710.

What will be the angle of incidence when a rayof light passes through the centre of curvatureof a concave mirror?

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A ray oflight passing through the centre of curvatureof a concave mirror retraces its path (gets reflectedalongthe same path), because as the ray oflight passes through centre of curvatureof a concave mirror it strikes the mirroralongthe normal i.e. it incidences on to the mirror at 90 degree.

7711.

b) Refractive index of diamond with respect to glass is 1.6. What is the critical angle whenlight passes from diamond to glass?

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7712.

Show that the vector $ \mathrm{A}=\hat{\mathbf{i}}-\hat{\mathbf{j}}+2 \hat{\mathbf{k}} $ is parallel toa vector $ \mathbf{B}=3 \hat{\mathbf{i}}-3 \hat{\mathbf{j}}+6 \hat{\mathbf{k}} $

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B= 3(î-ĵ+2k̂)= 3A

B can be expressed in form λA where λ=3, which means vector B is parallel to vector A.

7713.

L. (a) A student is unable to see clearly the words written on the black boardplaced at a distance of approximately 3 m from him. Name the defectof vision the boy is suffering from. State the possible causes of thisdefect and explain the method of correcting it.

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THE PERSON IS SUFFERING FROM MYOPIA.CAUSES: 1. EXCESSIVE CURVATURE OF EYE LENS.2. ELONGATION OF EYE BALL.THIS DEFECT CAN BE CORRECTED BY USING A CONCAVE LENS OF APPROPRIATE POWER ...

bhai bhut bhut thanks give ans again plzz i uplodded question

7714.

2. Two moles of an ideal gas are undergone a cyclic process 1-2-3-1. If net heat exchange in the process is300 J, the work gone by the gas in the process 2-3-isoner600 K-23300 KF커 .(a) -500J(b) -5000J(c) -3000(d) of these.

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-500 this is right answer

7715.

(55) What is the periodic trend in thevariation of valency while going from left toright within a period? Explain your answer withreference to the period 2 and period 3.Ans

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While moving left to right across a period, the number of valence electrons of elements increases and varies between 1 to 8.

Valency first increases and then decreases.

Valency increases from 1 to 4 and then decreases.

7716.

1.21.2TUWYVUNIf a particle is moving from rest and then cover12m in 8th second, then what will be theacceleration of that particle?

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7717.

1. State clearly the effect of force

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Aforceacting on an object causes the object to change its shape or size, to start moving, to stop moving, to accelerate or decelerate. ... If the resultantforceacting on the object isn't zero then: the object will either accelerate or decelerate

7718.

I. Area of cross section3. LengthThe number of electrons strinking the screen of CRT is 7.5 x 10"s in IOs. Calculatethe electric current2. Material and temperature4. All1.60μΑ2. 120μΑ3, 180LA4, 200pAumbe ofelectrons nassing per sec

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Current ischarge/time

Charge =7.5*10^15*e

Therefore current =1.6*10^-19*7.5*10^15/10

7719.

25. Consider the situation shown in figure (5-E9). All thesurfaces are frictionless and the string and the pulleyare light. Find the magnitude of the acceleration of thetwo blocks.1.0 kg1.0 kg3 m4 m5 mFigure 5-E9

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It is clear that the triangle is a right angled triangle and the vertex angle at pulley is 90°. See the diagram below. Let angle ACB = θ . The component of weight mg along the 3 m side =mg.cosθ = 4mg/5. The component of weight mg along the 4 m side =mg.sinθ = 3mg/5.Let tension in the string be T and the acceleration of the blocks along planes be a. Consider the forces and acceleration along the plane on left side block, 4mg/5 - T = ma, →T=4mg/5-ma ........... (A) Consider the forces and acceleration along the plane on right side block, T-3mg/5 =ma, 4mg/5-ma-3mg/5=ma, {Putting the value of T from (A)} → 2ma = mg/5 → a=g/10. So the acceleration of the blocks is g/10.Read more on Sarthaks.com - https://www.sarthaks.com/42665/consider-the-situation-shown-in-figure-5-e9-all-the-surfaces-are-frictionless

7720.

31. Consider the situation shown in figure (5-E14). Both thepulleys and the string are light and all the surfaces arefrictionless. (a) Find the acceleration of the mass M.(b) Find the tension in the string. (c) Calculate the forceexerted by the clamp on the pulley A in the figure.2 MFigure 5-E14

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7721.

.Calculatetheacceleration inapplying a force VIN.

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Force=mass*accelerationacceleration=1/50*10^-3=10^3/50=20m/s^2

7722.

Calculate acceleration.through 370. Find its angle of emergence.

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7723.

1. An electric current of 20 A passes through a wire ofresistance 25 Ω. How much heat will be developed in1 minute?g hattery

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7724.

2.An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a waterfilter of resistance 500 Ω are connected in parallel to a 220 V source.What is the resistance of an electric iron connected to the same sourcethat takes as much current as all three appliances, and what is thecurrent through it?

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Thank you

7725.

An electric lamp of 100 L1.江master of resistance, 50 il·ann i, at c .er of resistance 500 Ω are connected in parallel to a 220 V sourcehat is the resistance of an elecic troo comected to the same soue, and what s theltthar takes as much current as all three appiantescurrent through i

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7726.

2Alte electric lamp of 100 Ω, a toaster of resistance 50 Ω,and a waterer of resistance 500 Ω are connected in parallel to a 220 V sourceha as the resistanee of an electric tron connected to the same sourcekes as much current as all three appliances, and what is thecurrent through it?

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7727.

14, A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω.Howmtcurrent would flow through the 12 Ω resistor ?

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7728.

A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ωand 1252, respectively. Hov much current would flow through the 12Ω, 0.4 Ω , 0.5 Ωresistor?

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7729.

Find PB, given that PA15, PC 20, PD 7, and ABCD is a square.8

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7730.

37. One horse power is equal to

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It was originally defined as 550 foot-pounds per second (ft-lb/s). Apowerlevel of1 hpis approximatelyequivalentto 746 watt s (W) or 0.746 kilowatt s (kW). To convert fromhorsepowerto watts, multiply by 746.

1Horse Power = 746 WATT

Value of 1HP=746 Watt

The electrical equivalent of one horsepower is 746 watts in the International System of Units (SI), and the heat equivalent is 2,545 BTU (British Thermal Units) per hour. Another unit of power is the metric horsepower, which equals 4,500 kilogram-metres per minute (32,549 foot-pounds per minute), or 0.9863 horsepower.

1HP is equal to 746 Watt

1hp is equal to 746 watt

7731.

5. How many watts equal one horse power ?

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7732.

lo,oneofthesatellites of Jupiter, has an orbital period of 1.769 days and teradiisof the orbit is 4.22 x 10 m. Show that the mass of Jupiter in about one thousandththat of the sun.

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7733.

9. The electric field component in Fig. are Ex-ax 12 EEz-0 in which α-800 NC m2.me.Consider the cube shown in Fig. Calculate (a) The flux pe through the cube and (b) Chargewithin the cube. Assume that a俨0.1 m.

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7734.

The distance of planet Venus from the sun is0.73 AU. Find the orbital period ofVenus?(ans: 226days)

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7735.

1.The distance of the venus from the sun is 0.72 AU. Find the orbital period of Venus.

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0.61 years is equal to around 222.65 days

7736.

2. If a charge -150 nC is given to a concentric spherical 10shell and a charge +50 nC is placed at its centre then thecharge on inner and outer surface of the shell is

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As you might know a neutral conductor contains equal number of positive and negative charges.

When a charge say “+q” is placed inside a conductor it attracts the oppositely charged particles in the conductor and hence charge equal in magnitude but opposite in sign is induced on the conductor in this case “-q”

But as the conductor is electrically neutral at the start, it will remain electrically neutral as there is no flow of charges.

Therefore to balance the “-q” charge induced on the inner surface a charge of same magnitude and opposite sign is induced on the outer surface of the condutor.

So the total charge on the conductor remains same as before i.e zero.

7737.

Which of the following is a Reflector of light-a. Moonb. Sunc.Starsd. of these

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🌒 moon is the correct answer of the given question

moon is the reflector of light

Star is the reflection of light

Moon has its own source of light

MOON is correct answer of this question.

7738.

Why is lightning dangerous?

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One reason lightning is so dangerous is that it's hard to know just when and where it is likely to strike—or how it will behave when it does. ... Lightning can actually strike outside the storm that produced it. Although most lightning will strike within 10 miles of its parent thunderstorm, it can strike much farther away.

7739.

What does (qi+q2)0 signify?

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please post full question

7740.

4.A body of mass 3 kg is under a constant force which causesa displacement s in metres in it, given by the relations = 51', where t is in seconds. Work done by the force in2 seconds is(a)(b) TJ10

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8/3j because it is so easy step of formulas

7741.

MUULUU ULICILLIUMIN6.m/s2At the end of a race, a runner decelerates from a velocity of 9 m/s at a rate of 2(a)zas-V-02How far does he travel in the next 5 s?What is his final velocity?How much time will it take to finally stop?(c)2x

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Initial velocity, u = 9m/sAcceleration, a = -2m/s^2

(a)time, t = 5 secs = ut + (1/2)at^2s = 45 + (1/2)(-2)25s = 45 - 25s = 20 m

(b)final velocity, v = u + atv = 9 + (-2)5v = 9 - 10 = -1 m/s

(c)to stop, v = 00 = u + at0 = 9 + (-2)t2t = 9t = 4.5 sec

Hope it helps.Mark as best if I am correct.

7742.

The forces Ā = (1 + i + k) B = (22 - 1 + 36 )and c acting on a body keep it in equilibrium. Then Čis(a) – 31+46) (6) 31 +48(0) 21 -36) (d) – 21-34).

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7743.

aomsT Bomb B dropped ow an enganeTh an Aeroplan flying hairanlahT velocity 6 bokmu v & at al heightTat the time I dropping the TombThas the aeroplan should be from theD o nat. So that the bomb! may directed1) Vool,larges) 500/3 m 3) 17 m 47 490m

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1) 400/3mis a correct answer

7744.

Four particles enter a region of uniform magneticfield. Their trajectories are shown in figure. Whatare the signs of the charge of all four particles?

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for a positive charge... using right hand thumb rule the

IN THE FIGURE

if the magnetic field is downward (×) , and velocity is from left to right.. , then the magnetic force will be such that the particle will move in anticlockwise...( force will be upward)...

here for A.. it is following clockwise path.. to charge will be -ve..

same goes for B too.. it is also -ve

for C it is following anticlockwise path.. so, +ve charge..

and D is going undeflected.. so , D is neutral..

7745.

av Toks into a plane mirror which is 5.5 m away from him. He see the image ofa chart which faces the mirror and is 0.5 m behind him. How far away from him does the image ofchart appear to be ?(1) 0.5 m(2) 5.5 m(3) 11.5 m

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5.5m

7746.

if current following is 10 amphere and voltage 9.8 find the current when voltage is 150 volte

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Current flowing=10 AmpVoltage=9.8 VResistance=10/9.8=1.02 ohm

When voltage is 150 V, current flowing=V/R=150/1.02=147 Amperes

7747.

What change should be made in an a.c. generator so that it may become a d.c. generator?

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7748.

Construction of an A.C. Generator

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7749.

. A secondary cell after long use has an emf of 1.9 V and a large internal resistance of 380 2. Whmaximum current can be drawn from the cell? Could the cell drive the starting motor of a car ?

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7750.

A transformer having effiency of 90% is working on 100v and 200kw power if the current in the secondary coil is 5 amphere calculate (1) the current in the primary (2) voltage a cross the secondary coil.

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Hence 1)current in primary is 20A2)voltage is 360V