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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Proof of Kepler\'s first law |
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| 2. |
Capillary rise method practical |
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| 3. |
Why toothpaste comes out suddenly when pressed it ? |
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Answer» inner pressure decrease due to which velocity of toothpaste increases (Bernoulli theorem\'s) Force applied on toopaste tube create pressure on it |
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| 4. |
After the death of any living being .. where did his/her energy goes |
| Answer» His energy absorbed by insects | |
| 5. |
Why does the moon does not have an atmosphere |
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Answer» The escape speed on moon(2.3km/sec.) is comparable to the rms speed of molecules,the fastest molecules will escape from upper region of atmosphere.So,moon doesn\'t have any atmosphere. Cause on moon the escape velocity of air is higher due to which no air can remain in it\'s atmosphere. |
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| 6. |
Amstomers |
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| 7. |
Derive the relation for work in isothermal process. |
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| 8. |
What is the relation between the slope of isothermal and adiabatic curve |
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| 9. |
Why is dangerous to stand on the edge of the platform line when the trip is passing by |
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| 10. |
Real life example of elasticity |
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Answer» eraser rubber band |
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| 11. |
Given : P =3i-4j .Which of the following is perpendicular to P. |
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| 12. |
Define centripetal acceleration and derive expression |
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| 13. |
The r |
| Answer» In the term of Physics R is the radius and in the term of computerr is a free programming language and software environment | |
| 14. |
Difference between stationary wave and progessive wave |
| Answer» A wave that travels from one point of the medium to another is called a progressive wave. A progressive wave may be transverse or longitudinal. A stationary wave is formed when two identical waves travelling on the opposite directions along a straight line interfere. The superposition of two waves will give rise to a stationary wave. Formation of stationary wave is possible only in bounded medium. | |
| 15. |
What is efflux |
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Answer» That is water floeing from orifence(hole) Well ..its the FLOWING OUT of substances |
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| 16. |
Rain is falling |
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Answer» R u on brainly Let it fall ? |
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| 17. |
Laws of floatation |
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Answer» It tells us that body will float in liquid if weight of liquid displaced by bodyimmeresed part is equal to weight of body Laws of floatation tells about archemesis principal If any object immersed partly or completely in fluid then fluid exerts an upthrust which is called buoyant force ,this whole phenomenon is know as buoyancy. Law of floatation states that for a floating object the weight of object equal to the weight of liquid displaced by the object |
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| 18. |
How will you distinguish between a hard boiled egg and a raw egg by spinning each on table top? |
| Answer» To distinguish between a hard boiled egg and a raw egg we spin each on a table top. The egg which spins at a slower rate shall be raw. This is because in a raw egg liquid matter inside tries to get away from its axis of rotation. Therefore its moment of inertia increases. As t = I α = constant therefore α decreases i.e. raw egg will spin with smaller angular acceleration. The reverse is true for a hard boiled egg which will rotate more or less like a rigid body. | |
| 19. |
Explane viscosity |
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Answer» The property of a fluid due to which relative motion between it\'s layer is opposed id called viscosity It is the property of the liquid by virtue of which an internal frictional force. Comes in to play when the fluid in motion in form of layer having relative motion off the diff. Layer It is called fluid friction or viscus drag of fluid.. |
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| 20. |
Bending of road |
| Answer» Arslaanji I think it is banking of road if it is the question : the answer is:the ends of curved roads are raised because the raider while travelling on curved road feels to lean inward to avoid that feeling banking of road is done | |
| 21. |
What is the effect of pressure on Melting point |
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Answer» it depends on nature of substance ..the m.p. of those substances which expand on melting (eg. paraffin wax ,water) increase with inc. in pressure and m.p. of those substance which contract on melting (eg. iron ) decrease with inc. in pressure M.p dec Melting point decrease on increase in pressure |
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| 22. |
What is Hydrostatic paradox |
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Answer» It is dependent of the height Pressure is same at the same levels irrespective of shape of the vessel |
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| 23. |
What relationship between temperature and average kinetic energy of gas |
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| 24. |
All the derivation of 11std |
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| 25. |
is it possible to open a pen cap with one finger ?why? |
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Answer» S it is possible because torque is a work going on when we open a cap the two fingers produce enough friction to open a cap Yes, it is possible |
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| 26. |
Condition for eqilibrium of liquid drop placed on solid surface |
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| 27. |
Explain wave length,wave number and frequency of waves |
| Answer» Wavelength -the distance between any two crest or trough is known as wavelength . Wave number-no. Of wave in one centimetreFrequency-it is the no. Of waves passing through one point in one second | |
| 28. |
Equipartition of energy |
| Answer» Distribution of energy in same amount | |
| 29. |
Proof of rocket propulsion |
| Answer» When a rocket\'s fuel is ignited then the rocket exerts large amount of gas with high pressure,the gas exerted was in downward direction so for every action there is an opposite and equal reaction the gas with high pressure pushes the rocket In opposite direction of which the gas is exerted so the rocket moves upward | |
| 30. |
Why pushing an object is easier than pulling it?? |
| Answer» While we pushing friction oppses opposite force due to which is harder to push then pull | |
| 31. |
Explain bernoullis principle |
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Answer» Acc. to bernoulli principle the sum of pressure kinetic energy & potential energy per unit volume remains constant. according to burnolii velocity and pressure are inversely proportional to each other and product of these to are constant increase in speed of fluid occurs simultaneously with the decrease of pressure This is bornoullis principle Explain : In fluid dynamics , if there is increase in speed of a fluid under our consideration then the pressure decreases |
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| 32. |
if pressure is made16 times, what will be the effect on velocity of sound |
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Answer» Though change of pressure does not effect velocity of Sound but if change of pressure effect density of medium through which sound propagates then velocity of sound would be affected I think pressure doesn\'t matters here if it matters then the effect will be small amounr |
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| 33. |
Bernoulli\'s principle |
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Answer» Along the stream line of an ideal fluid ,the sum of the potential energy , kinetic energy and pressure energy per unit mass remains constant Exam point |
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| 34. |
Why calorimeter is used |
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Answer» Sry it is calorimetry It is used in determining the heat from chemical reactions and physical change this process is called calorimetru |
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| 35. |
Curve for stress and strain |
| Answer» It should be done by urself or u search in web.. | |
| 36. |
A man is travelling at 10.8 kmph in a topless car on a rainy day. He holds an umbrella at an angle of 37^(@) with the vertical so that he does not wet. If rain drops faals vertically downwards, what is the rain velocity ? |
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Answer» `1 MS^(-1)` |
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| 37. |
An ideal gas with the adiabatic exponent y goes through a direct (clockwise) cycle, consisting of adiabatic, isobaric and isochoric lines. Find the efficiency of the cycle if in the adiabatic process the volume of the ideal gas increases n fold. |
| Answer» SOLUTION :`1-( GAMMA(n-1))/(n^gamma -1)` | |
| 38. |
A metal block of base area 0.2m^(2) is connected to a 0.02 kg mass via a string that passes over an ideal pulley as shown in figure.A liquid film of thickness 0.6 mm is placed between the block moves to the right with a constant speed of 0.17 m/s The coefficient of viscosity of liquidis ....... |
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Answer» `3.45xx10^(3)PA*s` `thereforeeta=(FDeltax)/(ADeltaV)` `=(mgDeltax)/(ADeltaV)` `=(0.2xx9.8xx6xx10^(-4))/(0.2xx0.17)` `thetaeta=34.58xx10^(-4)` `thereforeeta=3.45xx10^(-3)Pa*s` |
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| 39. |
A U -shaped wire is dipped in a soap solution, and removed . The thin soap film formed between the wire and the light slider supports a weight of 1.5xx10^(-2)N (which includes the small weight of the slider ).The length of the slider is 30 cm . What is thesurface tension of the film ? |
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Answer» SOLUTION :Here , W=F 2Sl =W `S=(W)/(2l)` `=(1.5xx10^(-2))/(2xx0.3)` `=2.5xx10^(-2)NM^(-1)` |
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| 40. |
Match Column-I of physical quantity with its correct unit in Column-II and mark the correct option from the codes given below. {:( "Column-I","Column-II"),(" A)Specific heat","P )" JK^(-1)),(" B) Latent heat","Q) " jkg^(-1)),(" C) Molar specific heat","R) " Jmol^(-1)K^(-1)),(" D) Thermal Capacity","S) " Jkg^(-1)):} |
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| 41. |
A uniform elastic plank moves overa smooth horizontal plane due to constantforce F_(0)distributeduniformly over the end face. The surfacearea of the end faceis equalto A and Young.s modulusof the material is Y. Find the compressive strain of the plank in the direction of acting force. |
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Answer» Solution :The forceat any SECTIONIS due to inertiabehind the section . The stress therefore INCREASES from zero to MAXIMUM at the endwhere force is APPLIED. Consider a small ELEMENT of lengthdx at a distance x from the free end.  The force `F_(x)=ma` `=((M)/(L)x)xx (F_(0))/(M)=(F_(0)x)/(L)` Elongation of the element`dl=(F_(x) (dx))/(AY) =(((F_(0)x))/(L)dx)/(AY)` Total dlongation `Deltal=int_(0)^(L) (F_(0))/(ALY)x dx=(F_(0))/(2ALY)L^(2)(or) Delta l=(F_(0)L)/(2AY)` |
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| 42. |
An air column in a glass tube , is open at one end and closed at the other by a movable piston . The air in the tube is warmed above room temperature , and a 384 Hz tuning fork is held at the open end. Resonance is heard when the piston is 22.8 cm from the open end and again when it is 68.3 cm from the open end . (a) What speed of sodium is impliedby these data ? (b) How far from the open end will the piston be when the next resonance is heard ? |
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Answer» SOLUTION :The resonance is heard as amplification , when all the air in the tube vibrates in a standing - wave pattern along with the TUNING fork . The air vibration has a node at the piston and an antinide at the top end . For an air column closed at one end , resonances will occur when the length of the column is equal to `lambda//4 , 3 lambda//4 , 5 lambda//4` and so on . Thus , the CHANGE in the length of the pipe from one resonance to the nextis `d _(NN) = lambda//2`. In this case, `lambda//2 = ( 0.683 - 0.228 )m = 0.455 m` and ` lambda = 0.910 m` a. ` v = f lambda = ( 384 Hz) ( 0.910 m) = 349 m//s` `b. L = 0.683 m + 0.455 m = 1.14 m` 
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| 43. |
A monkey of mass m moves up on a massless string so as to just lift a block of mass M. After some time the monkey stops moving w.r.t the string. Find the magnitude of the change in the monkey's acceleration. |
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Answer» Solution :When the MONKEY moves up with ACCELERATION .a. to lift the BLOCK `m(g+a)=Mg` `a=((M-m)g)/(m)` when monkey stops `a^(1)=((M-m)g)/(M+m)THEREFORE Delta a = a-a^(1)=(Mg(M-m))/(m(M+m))` 
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| 44. |
Two identical springs of spring constant k are attached to a block of mass m and to fixed supports as shown in figure. When the mass is displaced from equilibrium position by a distance x towards right, find the restoring force. |
Answer» Solution :According to below figure block is DISPLACED to right SIDE at distance x.  The right spring gets compressed by x DEVELOPING a restoring force KX TOWARDS left on the block. The left spring is stretched by an amount x developing a restoring force kx left on the block F.B.D. for this is as below.  Hence, total restoring force towards left on the block, `F= kx +kx` `therefore F= 2kx`. |
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| 45. |
What is Physics ? |
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Answer» SOLUTION :PHYSCIAL is a BRANCH of science which DEALS with the study of nature and natural phenomena. |
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| 46. |
As accurate centigrade thermometer and a Fahrenheit thermometer register 60^@ and 141^@respectively when placed in the same constant temperature enclosure.What is the error in the Fahrenheit thermometer ? |
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| 47. |
The length of a brass rod at 20^@Cis observed to be 0.8 m when measured by an iron scale, correct at 0^@C . What will be the correct length of the rod at0^@C ?Take, alpha_("iron") = 1.2 xx 10^(-5) ""^@C^(-1) alpha_("brass") = 1.9 xx 10^(-5) ""^@C^(-1) |
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Answer» Solution : LENGTH of brass rod at `20^@C, l_1 = 0.8 m = 80 cm` Length of brass rod at `0^@C, l_2 = ? ` It is GIVEN that the iron scale is CORRECT at `0^@C` . So at` 0^@C` ,each DIVISION is of 1 cm. At `20^@C` , each cm division is of `(1 + 1.2 xx 10^(-5) xx 20)` = 1.00024 cm True length of iron scale at `20^@C = 100 xx 1.00024 cm = 100.024 cm` True length of brass rod at `20^@C = 80 xx 1.00024 cm` ` = 80.0192 cm` So , `l_2 (1 + 19 xx 10^(-5) xx 20) = 80.0192 cm` ` rArr l_2(1+0.00038) = 80.0192 cm` ` rArr 1.00038 l_2 = 80.0192 ` ` rArr l_2 = (80.0192)/(1.00038) =79.98 cm` |
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| 48. |
A position of 1MeV collides with an electron of 1MeV and gets annihilated and the reaction produces two gamma-ray photons. If the effective mass of each photons is 0.0016amu, then the energy of each gamma-ray photon is about- |
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Answer» 1.5 MeV |
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| 49. |
A piece of wood of mass m is floating erect in a liquid whose density is rho . If it is slightly pressed down and released,then executes simple harmonic motion. Show that its time period of oscillation is T=2pisqrt((m)/(Arhog)) |
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Answer» Solution :SPRING factor of liquid (K) = `Arhog` INERTIA factor of PIECE of wood = m m Time period T = `2pi SQRT(("Intetia factor")/("spring factor"))` T = `2pi sqrt((m)/(Arhog))` |
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| 50. |
A capillary tube is fitted horizontally near the bottom to the wall of a vessel. Find the ratio of the rate of flow of water to that of a liquid, if the experiment is repeated by filling the vessel upto the same level first with water and then the liquid .(For water (eta) = 0.001 P and for liquid eta= 0.002 Pas, density of liquid is =0.8xx10^3 kg//m^3) |
| Answer» Solution :RATE of flow `V prop (rho)/(eta) THEREFORE (V_1)/(V_2) = ((rho_1)/(rho_2)) ((eta_2)/(eta_1))= ((1000)/(800)) ((0.002)/(0.001)) = 2.5` | |