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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.
| 6201. |
Problem 2.07. A steel wire has a length of 12 m andof 0-6kg. What should be the tension in the wire, so thpeed of a transverse wave travelling on the wire is equ2 m s-1 ? |
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| 6202. |
Relation between wave speed frequency wavelength |
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Answer» Wave Speed=WavelengthxFrequency |
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| 6203. |
The speed of a wave in a medium is 960 m/s. If 3600 waves are passing through a point in1.in 1 minute, then calculate the wavelength.nediumSpeed of the wave, U 960 m/s |
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Answer» Frequency = 3600/(60second)60hzvelocity of wave= 960m/sWavelength = v/f960/6016mwavelength will be of 16 meter |
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| 6204. |
A bullet shot with a velocity of 16m/s penetrates a treetrunk and come to rest in 0.4m. In what time does itcomes to rest? |
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Answer» Initial velocity= u= 16 m/sdistance covered = S= 0.4 mFinal velocity=v= 0 m/s the equation of motion;v²=u²+2aS 0=16²+2 x a x 0.4 a=-16²/0.8 a=-320 m/s As it carries a negative sign it represent retardation. Time taken during the retardation is given by the equation;v=u+at0= 16-320 x t t=16/320 t=1/20 t=0.05 s |
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| 6205. |
The power of a motor pump is 2Kw. How much water per minute can be pump raise to a height of 20mtrs. |
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Answer» Given, power of pump = 2kW =2000W Time (t)= 60sec Height (h) = 20m g = 10m/s2 As you know, power =work done per unit time. Work done = mgh = m ×10×20 =200m Therefore, 2000W = 200m/60s Therefore, m = 600kg So, the pump can raise 600kg of water in one minute. |
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| 6206. |
In power of a motor pump is 2kw How much water per minute can the pump raise to hight of 20 mtrs ( given = 10m/S2 |
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| 6207. |
power of a motor pump is 2Kw.How much water per minute can the pump raise to aheight of Z0 mtrs. (given g 10 m/s) |
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| 6208. |
Draw symbol and truth table of NOT gate. |
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| 6209. |
Using truth table, show that AB=A+ B. |
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| 6210. |
The power of a motor pump is 2Kw.How much water per minute can the pump raise to a height of 20 mtrs. (given g 10 m/s2) |
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Answer» Given, power of pump = 2kW =2000WTime (t)= 60secHeight (h) = 20mg = 10m/s2As you know, power =work done per unit time.Work done = mgh = m ×10×20 =200mTherefore, 2000W = 200m/60sm = (2000×60)/200Therefore, m = 600 kgSo, the pump can raise 600 kg of water in one minute. |
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| 6211. |
write the truth table of or gate and also draw it's logic symbol? |
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Answer» Like if you find it useful |
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| 6212. |
A wire loop is rotated in a magnetic field. Thefrequency of change ofdirection of the inducede.m.f. is(a) twice per revolution(b) four times per revolution(c) six times per revolution(d) once per revolution |
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Answer» so, in 1 rotation.. it will change twice. option A. |
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| 6213. |
(A) NAND gate(B) NOR gate(C) XOR gate(D) XNOR gate |
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| 6214. |
uI Suund depends.A bat can hear sound at frequencies up to 120KHz. Determine thesound in air at this frequency.(Take speed of sound in air as 344m/s.)wavelength of |
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Answer» Frequency =120 KHz =120000 HzFrequency= Speed of light /WavelengthSo, wavelength=Speed of light/ frequency=344/120000 = 0.00287 m. |
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| 6215. |
b] A bat can hear sound at frequencies up to 120KHz. Determine the wavelength ofsound in air at this frequency.(Take speed of sound in air as 344m/s.) |
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Answer» Wavelength = speed/frequency= 344/(120000)= 0.002866667 m Please hit the like button if this helped you |
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| 6216. |
A bat can hear sound at frequencies up to 120KHz. Determine the wavelength ofsound in air at this frequency.(Take speed of sound in air as 344m/s.)[b] |
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| 6217. |
Distinguish between distance and displace ment. |
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Answer» Distancetravelled is a scalar quantity whiledisplacementis a vector quantity. ... But if the body changes its direction while moving, then thedisplacementis smaller than thedistancetravelled |
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| 6218. |
Q.5The unit of radius of gyration is |
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Answer» The unit of radius of gyration is length. (mm,cm,inches,feet,etc.) |
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| 6219. |
19. A heat engine with a thermal efficiency of 40%, rejects 1000 kJ/kg of heat. How muchheat does it receive.[Ans.: 1666.67 kJ/kg] |
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| 6220. |
escape velocity of a body from thesurface of laith 11.2 kms. If satellietWhere to otbid close to the surfaceWhat would be it's creatical velocitur |
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| 6221. |
what would be its mays10. A boy jumps a distance of 2m on the surface of the earth What distansurface of the moon where g is 1/6th of the value on the surface of the earth?will he jump on the |
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| 6222. |
A rocket is fired upward from the earth's surfacesuch that it creates an acceleration of 19.6 m/sec?lf after 5 sec its engine is switched off, themaximum height of the rocket from earth's surfacewould be ? (g = 9.8 m/s?) |
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| 6223. |
22. In the arrangement as shown, tension T2 is(g = 10 m/s2)60°T.30%T.210 kg |
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Answer» Given :m=10kgg=10m/s2 When a body of mass m is suspended by two strings making an angleα and β with horizontal then:T1=mgcosβ/sin(α+β)T2=mgcosα/sin(α+β) β=30α=60T2=10x10xcos(60)/sin(60+30)=100x(1/2) / 1=50N∴Tension T2=50N no it's wrong t2 is 50 newton he is right no ans is 100 N can u plz tell the direction of tensions |
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| 6224. |
A stone is released from an aeroplane which isrising with upward acceleration 5 m/s2. Hereg = 10 m/s2. Two seconds after the release,separation between stone and aeroplane will be |
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| 6225. |
Detween lass Ul ail U5. What is pressure? Write its formula. |
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Answer» ◆pressure is a term used for something on which force is exerted per unit area.◆Numerically pressure is defined as :f/awhere f is force and a is area .◆it's SI unit is Pascal or pa |
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| 6226. |
Ul Blurns the paper0 If a spherical mirror breaks, what type ofmirrors are the individual pieces? |
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Answer» If spherical mirror break we get concave and convex mirrors.and the individual pieces are of same typebecause there is no change in nature of reflecting surface |
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| 6227. |
The equation of motion of a projectile is y 12 x- 3/4 . Given that g 10 s2 what is the rangsthe projectile? (the origin is the point of projection, x-axis is horizontal and y-axis is vertical(A) 36m(R) 30 6 m |
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Answer» y=12x-3/4x^2 The simplest way to calculate the range is to put y=0 in the equation of parabolic trajectory. This gives- 12x-3/4x^2=0. Therefore, x(12–3/4x^2)=0. Then, x=0 gives x coordinate of the point of projection and 12=3/4x or x=16 m gives the range of the projectile. We can find range by noting that at x=R/2, dy/dx=0. dy/dx=12–3/2x=0 for x=R/2. Thus, 12–(3/2)R/2=0. Therefore, R=16m. |
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| 6228. |
LEVEL- VIMOTION ALONG HORIZONTALAXISSINGLE QUESTION TYPEThe decelaration experienced by a movinmotor boat, after its engine is cut-off is givby av=-kv,where k is constant.If v, is themagnitude of the velocity at cut-off, tmagnitude of the velocity at a time t afterthe cut-off ishev C) Voe |
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| 6229. |
A device X' is connectedofto an ac source V - Vg sin cot. The variationin one cycle is shown in the following graphac source02π(a) Identify the device 'X.Which of the curves A, B and C represent the voltage, current andthe power consumed in the circuit ? Justify your answer.(b)How does its impedance vary with frequency of the ac source ?Show graphically.(c)(d) Obtainan expression for the current in the circuit and its phaserelation with ac voltage. |
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Answer» The device X is a capacitorCurve A: Power consumed in the circuitCurve B: VoltageCurve C: Current (because current leads the voltage in capacitive circuit |
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| 6230. |
W.E-8. A particle of mass m is at rest at the origint time t-0. It is subjected to a forceF(o-Fer in the X-direction. Its speed V(b)is depicted by which of the following curves.(AIEEE-2012)Fombmb1)2)mb3)4) |
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| 6231. |
1.22 An electron gun with its collector at a potential of 100 V fires outelectrons in a spherical bulb containing hydrogen gas at lowpressure (-102 mm of Hg). A magnetic field of 2.83 x 104 T curvesthe path of the electrons in a circular orbit of radius 12.0 cm. (Thepath can be viewed because the gas ions in the path focus the beamby attracting electrons, and emitting light by electron capture; thismethod is known as the fine beam tube' method.) Determinee/m from the data |
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| 6232. |
What is the work done by a man in carrying a suitcase weighing30 kg over his head, when he travels a distance of 10 m in(ù vertical and (i) horizontal directions? |
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Answer» i) W.D = FScos∅ = mg*h*cos(0) = 30*10*10 = 3000J ii) W.D = FScos∅ = mg*h*cos(90) = 0 |
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| 6233. |
A point particle of mass m, moves alongthe uniformly rough track PQR as shownin the figure. The coefficient of friction,between the particle and the rough trackequals Îź. The particle is released, from rest,from the point P and it comes to rest at apoint R. The energies, lost by the ball, overthe parts, PQ and QR, of the track, areequal to each other, and no energy is lostwhen particle changes direction from PQto QR. |
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| 6234. |
A point moves along a circle with velocityv = at where a 0.5 m/sec2. Then the totalacceleration of the point at the moment whenit covered (1/10) th of the circle afterbeginning of motion -(A) 0.5 m/sec2 (B) 0.6 m/sec2(C) 0.7 m/sec2 (D) 0.8 m/sec2 |
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Answer» option 2 is correct .0.6 meters per second option 2 is correct answer... option (b) is the right 0.6 meters per second |
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| 6235. |
Two grinding wheels of the same specificationsbehave differently when they are of different diametersbecause: |
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Answer» Because of the different diameter the rotation is being affected and torque weight ratio may also be the factor |
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| 6236. |
A particle is moving eastwards with a speed of6 m/s. After 6 s, the particle is found to be movingwith same speed in a direction 60° north of east.The magnitude of average acceleration in this intervalof time is6 m/s60°sastaaa6 m/s |
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| 6237. |
A particle is moving eastwards with a speed of6 m/s. After 6 s, the particle is found to be movingwith same speed in a direction 60 north of east,The magnitude of average acceleration in this intervalof time is |
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| 6238. |
(on)A tain of length 60 m ia moving with a consCaleulate the time Jaken by the train to Gross annd a bridge of length 300 m.constant speed 20 mniselectric pole |
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Answer» time = distance/speed = 300-60/20 = 240/20 = 12 sec |
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| 6239. |
0.A particle ia moving east-wards with a velocity of 4 m/s. In 5 seconds the velocity changes to 3 m/snorthwards. Find the average acceleration in this time interval ? |
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Answer» Vi=4i Vf=3j Avg acceleration =|(Vf -Vi)|/5 =|3j-4i)|/5=-1/5 m/s2 |
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| 6240. |
3. A particle has initial velocity (21 +3) and acceleration (0.3+ 0zj). The magnitude of velocity after 10 secorwill be:(1) 5 units(2) 9 units(3) 9 /2 units(4) 5 /2 units4.A particle is moving such that its position coordinate (x, y) are (2m, 3m) at time t-0 (6m, 7m) at tt 2 s and (13m , 14 m) at time t 5 sAverage velocity vector (%) from t-0 to t(1) 1(13i+14j)is7(2) i j)3(3) 2+j)5 |
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| 6241. |
If the image formed by a lens for all positions of an object placed in frontof it is always erect and diminished, what is the nature of this lens?Draw a ray diagram to justify your answer. If the numerical value of thepower of this lens is 10 D, what is its focal length in the Cartesiansystem? |
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Answer» Power of a lens is given by the relation... P = 1/f(in meter) P=10D F=1/p =1/10 =0.1m Or. -10cm,(as lens in concave lens. ) Hope it helps you |
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| 6242. |
a man travelled 2/5 by bus,one third by train,one fourth bycar and remaining 3km on foot.what is the length of his totaljourney |
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| 6243. |
3. State and explain the Cartesian sign for spherical lens. |
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| 6244. |
AC THEORY INTRODUCTION |
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Answer» AC Theory. In electronics, ac sources are widely used. A dc (direct current) source, current flows only in one direction, but an ac (alternating current) source both voltage and current continually change direction. The rate of change is called the angular velocity, symbol ω and is measured in radians. |
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| 6245. |
Thread measurement with inserts fitted in the anvil and spindle of screw tread micrare selected on the basis of one the following elements of a thread being measureda) Major diameterb) Minor diameterc) Effective diameterd) Pitch |
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Answer» An external thread is determined by the outside diameter, pitches and thread angles. A slide gauge measures the outside diameter, and a screw pitch gauge measures the pitch and controls the thread angle. Measuring the internal thread is difficult as a slide gauge also measures the inside diameter, however, the thread angle cannot be determined. Likewise, the screw pitch gauge cannot accurately determine the pitch. Measuring threads can be difficult, especially the internal thread. Often, tools are used such as the thread plug gauge for the internal measuring and a thread ring gauge or a thread pitch gauge for the external thread measuring. a, d are the answers |
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| 6246. |
derive an expression for torque in cartesian co-ordinate system |
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| 6247. |
5. A cylinder of diameter 1.0 cm at 30°C is to be slidinto a hole in a steel plate. The hole has a diameterof 0.99970 cm at 30°C. To what temperature mustthe plate be heated ? For steel, α 1.1x 10-5°C-1Ans, 5730 |
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Answer» ΔL=Lo(steel plate)α(steel plate)(Tf-To) 1.0cm-0.99970 cm = (0.99970 cm)(1.1x10^5)(Tf-30) Tf=57.28°C |
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| 6248. |
16. A hole is drilled in a copper sheet. The diameter of the hole 2is 4.24 cm at 27.0°C. What is the change in the diameterof the hole when the sheet is heated to 227°C? Coefficientof linear expansion of copper-1.70 x 10-5 K-1(a) 14.4 crm(c) 0.144 cm(b) 0.0144 cm(d) 1.44 cm |
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| 6249. |
xy+yz + zx =-16Example If a+b+ c-9 and ab + be + ca 36, then find the value of a+b+2Solution: On using identity |
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| 6250. |
C A cell of emf 'E' and internal resistance 't' is connected across a variabie load [2]resistor R. It is found that when R #: 4Ω, the current is 1 A and when R isincreased to 9 Ω, the current reduces to 0.5 A. Find the values of the emf E andinternal resistance r |
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