67486 + Interview Questions in Secondary School in Physics

1.	mercury is poured into a U-Tube in which the cross sectional area of the left hand limb is three times smaller than the right one the level of the mercury in the narrow limb is distance l = 30 cm from the upper end of the tube how much will the mercury level rise in the right limb if the left one is filled to the top with water
Answer» Angle of contact between mercury and soda lime glass, θ = 140° Radius of the narrow tube, r = 1 mm = 1 × 10–3 m Surface tension of mercury at the given temperature, s = 0.465 N m–1 Density of mercury, ρ =13.6 × 103 kg/m3 DIP in the HEIGHT of mercury = H Acceleration DUE to gravity, G = 9.8 m/s2 Surface tension is related with the angle of contact and the dip in the height as: s = hρgr / 2 Cosθ ∴ h = 2s Cosθ / ρgr = 2 × 0.465 × Cos1400 / (1 × 10-3 × 13.6 × 103 × 9.8) = -0.00534 m = -5.34 m Here, the negative sign shows the decreasing level of mercury. Hence, the mercury level dips by 5.34 mm.

Discussion

2.	Main disadvantages of nuclear power generator
Answer» They are non renewable energy resources if there is an ACCIDENT lots of RADIO ACTIVE material gets released into the environment nuclear WASTE remains radio active and is hazardous to HEALTH for thousands of years hope it helps mark as brainliest ................................................................................

Discussion

3.	Number of ergs contained in one Joule
Answer» 1 JOULE =10^7 ERGS....

Discussion

4.	A car of mass 1000kg first travels forward at 25m/s^2 and then backwards at 15m/s^2. what is the change in the k.E of the car?
Answer» M=1000kg V1=25m/s V2=15m/s Change in K.E= M(V2²-V1²) =1000(225-625) =1000(-400) = - 400000joule

Discussion

5.	What is the formula for electricity?
Answer» CURRENT (Q) or ELECTRICITY is RATE of FLOW of charge. I=q/t q-charge t-time

Discussion

6.	Velocity of light is minimum in - diamond,water,air ,glass
Answer» HEY FRND..... your ANSWER is GLASS HOPE THIS HELP YOU ☺☺❤❤❤

Discussion

7.	State the change noticed when blue litmus and red litmus are introduced in the sodium chloride solution
Answer» GOOD QUESTIONS but I am THINKING

Discussion

8.	How can we change work done into kinetic energy or potential energy?
Answer» It is The work done by the net FORCE that is equal to the change in KINETIC Energy. Work done on an object NEED not increase theKinetic Energy. A lifting force for example can increase gravitationalpotential energy or the work doneby a stretching force can increase elastic POTENTIAL energy. PLEASE PLEASE PLEASE MARK ME BRAINILIST

Discussion

9.	The law of constant proportions was given by which scientist
Answer» The LAW of CONSTANT PROPORTIONS was GIVEN by JOSEPH proust

Discussion

10.	Why clouds appear white ?
Answer» $\infty \: hey \: \: mate \: \: \infty$ •GOOD EVENING..., *Here is your answer..,,,, •Q. Why are clouds white? •Ans. When clouds are white (and MANY are not), “it’s because light from the sun is white, a combination of all the colors of the rainbow,” said Michael Kaufman, professor of physics and astronomy at San Jose State University in California. As light moves through the clouds, it is dispersed by WATER droplets. These are comparable to or bigger than the wavelengths of light, Dr. Kaufman said, and there are lot of droplets in the average cloud. •The result is that all the wavelengths are scattered more or less uniformly; to our eyes, no color predominates... •“LOOKING at a cloud from any other ANGLE, you see a mixture of all the scattered colors, so it looks white,” This effect is called Mie scattering, he added, “and is what you get when the WAVELENGTH of light and the particles it hits are comparable in size. It also works when particles are bigger than wavelengths of light.”.... •HOPES IT WILL HELP YOU MY DEAR MATE. $mark \: as \: the \: brainliest$ •Thanks for an Unique question.. •BY ISHITA.., ♡♥♡♥♡♥♡♥♡♥♡♥♡♥♡♥♡♥♡♥♡♥♡

Discussion

11.	If the mass of a body is double then by what percent its Kinetic energy will increased or decreased
Answer» Your answer is : Let initial kinetic ENERGY is 1/2 mv^2 when mass BECOME DOUBLE then kinetic energy is 1/2×2mv^2 = mv^2 % CHANGE in kinetic energy is mv^2/1/2mv^2 × 100 = 2×100 = 200% change in kinetic energy is 200%

Discussion

12.	The unit of plank's constant is - Nm,eV,J/sec ,JS
Answer» HI , the UNIT of Plank's constant is JULE / sec . HOPE it help you !! THANKS !!

Discussion

13.	Plzzzzzzzzzzzz........answer..... . By which process the tremendous electric charges in the atmosphere which produce sheet lightning in the clouds are produced?
Answer» The process of electric DISCHARGE between CLOUDS and the EARTH or between DIFFERENT clouds .

Discussion

14.	calculate the work done by a passenger standing on a platform holding his suitcase of weight 10 kg weight
Answer» SINCE w = [email protected] where f = FORCE applied in the direction of displacement s = displacement @= angle between applied force and displacement f = 10 and S = 0 since WORK DONE is [email protected] 10×0 = 1

Discussion

15.	Write the factors on which the pressure exerted by a liquid at a point inside the liquid depends?
Answer» HOPE it HELPS U.........

Discussion

16.	Which of the following is fundamental quantity - velocity, thermodynamic temperature ,surface tension , viscosity.
Answer» THERMODYNAMIC TEMPERATURE is the EXAMPLE of FUNDAMENTAL

Discussion

17.	if a spring is compressed with energy 25Jule with what velocity an object of mass 2kg start moving which is kept on it
Answer» Your ANSWER is :- SEE the ATTACHMENT

Discussion

18.	Meaning of quantum physics
Answer» The WORD quantum REFERS to discreteness, i.e., the existence of individual "lumps" as opposed to a CONTINUUM.

Discussion

19.	In which year did the law of constant proportion was proposed?
Answer» It was GIVEN by PROUST in 1779

Discussion

20.	How does AC motor work?
Answer» In an AC motor, there's a ring of electromagnets ARRANGED around the outside (making up the stator), which are designed to produce a rotating magnetic field. Unlike in a DC motor, where you SEND power to the inner rotor, in an AC motor you send power to the outer COILS that MAKE up the stator. ❤✌❤HOPE☺ THIS☺ HELPS ❤✌❤

Discussion

21.	Three resistors are connected in parallel , which resistor will be maximum power dissipation
Answer» Don't KNOW the ANSWER BEHIND it

Discussion

22.	The force required to row a boat at constant velocity is proportional
Answer» Answer: answer COMES to be 96h.p Explanation: P.S~ I don't KNOW the method but I only know is the answer....... thank-you..........MARK it as brainlest answer asap!!!!!!

22.

The force required to row a boat at constant velocity is proportional

Answer»

Answer:

answer COMES to be 96h.p

Explanation:

P.S~ I don't KNOW the method but I only know is the answer....... thank-you..........MARK it as brainlest answer asap!!!!!!

Discussion

23.	how much work is done by a force of 10 Newton is moving a body through a distance of 2 minutes Own Direction
Answer» Work..20 PLZ mark me as a BRAIN LIST

Discussion

24.	Light is an -mechanical wave , elastic wave , electromagnetic wave,matter wave
Answer» FASTER than light SPEEDS produce Cerenkov radiation. ... They provide evidence electrons MOVE through a medium which transports light. As the electron (or a charged/magneticentity) accelerates, light waves FORM in front of it, becoming BROADER as the speed increases.

Discussion

25.	What kind of lens are used in hyper metropia
Answer» ❤️❤️❤️HEY MATE ❤️❤️❤️ ⬇️⬇️⬇️⬇️ANSWER ⬇️⬇️⬇️⬇️ ⭐⭐⭐CONVEX LENS⭐⭐⭐ ✨WHY CONVEX LENS? ✨ IT'S BECAUSE HYPERMETROPIA DEFECTED PERSON USUALLY THE IMAGE FORMS BEFORE THE RETINA. THE CONVEX LENS AS IT IS A CONVERGING LENS CONVERGES AND FOR S THE IMAGE IN THE RETINA. ______________⚡I HOPE IT HELPS YOU ⚡______________

Discussion

26.	The velocity of light in a medium is 1.5×10^8 m/s critical angle of tha medium is - 30°,45°,60°,90°
Answer» HEY MATE! CRITICAL ANGLE IS 90

Discussion

27.	how much work is done by a force of 10 Newton is in moving a body through distance of 2 minutes own Direction
Answer» Given: Force: 10N and Distance: 2m. To find: The work done. Answer: Work is said to be done when a force PRODUCES a motion in the body. By applying the force, the body must be DISPLACED through a certain AMOUNT of distance. Work = ForceDistance Work = 102 Work done = 20 Joules Hope it helps :)

27.

how much work is done by a force of 10 Newton is in moving a body through distance of 2 minutes own Direction

Answer»

Given: Force: 10N and Distance: 2m.

To find: The work done.

Answer:

Work is said to be done when a force PRODUCES a motion in the body. By applying the force, the body must be DISPLACED through a certain AMOUNT of distance.

Work = Force*Distance

Work = 10*2

Work done = 20 Joules

Hope it helps :)

Discussion

28.	How 20% is equal to 1.2?
Answer» HEYA here is your ANSWER... 20% ×...... = 1.2 20/100 ×...... = 12/10 ...... = 12/10 × 100/20 ....... = 6 Hope it helps u THANKS ✅

Discussion

29.	Plzzzzzzzzzzzzz..............answer..............By which process does a charged object attracts an uncharged object by producing opposite charges in the nearer end of the uncharged object?
Answer» Ⓗⓔⓨ ⓕⓡⓘⓔⓝⓓ ⊙ FRICTION $hope \: it \: helps$

Discussion

30.	Calculate theforce which is applied to an area of 2.5 cm^2 to produce a pressure of 20 pascal
Answer» AREA 2.5cm SQ. = 2.5 x10^-4 m P=F/A F=PxA =20x2.5x10^-4 =5x10^-3 N

Discussion

31.	Calculate the work done by a passenger standing on a platform holding a suitcase of weight 10 kgwt
Answer» Here the passenger is standing on a platform so it's DISPLACEMENT will be zero SINCE we KNOW that , work done=FORCE X displacement = force x 0 =0 hence the work done is zero. hope it is the required answer...

Discussion

32.	What is biot sawart law explain briefly
Answer» The Biot-Savart Law is an equation that describes the magnetic FIELD created by a current-carrying wire, and allows you to CALCULATE its strength at VARIOUS points. ... And we also replacethe electric field E with a magnetic field ELEMENT dB because a moving charge produces a magnetic field, not an electric field.

Discussion

33.	The engine of a train has to apply a force of 5000n to overcome friction to run at a uniform rate of 90 km/h .What is the power developed by the engine
Answer» GIVEN that Force F = 5000 N velocity v = 90km/h = 25 m/s Power is given by P = F. v = 5000 N × 25 m/s = 125000 W = 125 KW

Discussion

34.	he'll friends quick answer. 1}. Explain the variation of thermo e m f . with temperature ??
Answer» SEX of. PLANTS are DIRECTLY or INDIRECTLY

Discussion

35.	Sun appear elliptical just before sunset beacause of - reflection, refraction, scattering, diffraction
Answer» BECAUSE OF REFRACTION......

Discussion

36.	A hunter has a machine gun that can fire 50g bullets with a velocity of 900m/s. A 40Kg tiger springs at him with a velocity of 10m/s how many bullets must the hunter fire into the tiger in order to stop him in his track
Answer» F=n/t×mv here n is no.of bullets so we getF= n/t×0.05×900so F =45n/t it is equal to mv/t because F=ma and u=0 so we GET n/t×45=40×10/t so we get approx as 9 bullets but we get in points because some bullets are FIRED but doesn't hit the TARGET

Discussion

37.	which of the following case is work done positive negative or zero a.work done by a Porter has given lifting it from the platform on to his head b.work done by the force of gravity on a suitcase at the suitcase falls down from the porters head c. work done by a person on a book held in his hand while walking with uniform speed on a horizontal Road in briefly
Answer» A is negative the porter is lifted upward the workdone by the gravity is negative b. POSITIVE a=+g when the porter FALL towrd the earth the workdone by the gravity is positive c. is zero a=0 when the person is holding the porter thwn no or zero WORK done by porter work done

Discussion

38.	State two observation that tells us light travels always In straight light
Answer» 1. FORMATION of shadow 2. PINHOLE CAMERA

Discussion

39.	What do you mean by voltage source and current source inverter?
Answer» A VOLTAGE source INVERTER(VSI) is FED by a stiff DC voltage, whereas acurrent source inverter is fed by a stiffcurrent source. A voltage source canbe converted to a current source by connecting a series inductance and then varying the voltage to obtain the DESIRED current

Discussion

40.	What do you mean by buoyancy hence define buoyant force?
Answer» HEY MATE here is ur answer BUOYANCY - the tendency of a liquid to exert an upward force on the object IMMERSED in it is called buoyancy buoyancy force - it is an upward force which act on an object when it is immersed in liquid it is called upthrust hope it helps U

Discussion

41.	The centripetal force required to revolve electron around nucleus is given by
Answer» ELECTRIC is the RIGHT answer hope it HELPS you

Discussion

42.	A force of 10N acts on a body of 2kg for 3s.Find its kinetic energy acquired by the body in 3s.
Answer» K.E=P^2/2m =(F×t)^2/2m =(10×3)^2/2×2 =(30)^2/4 =900/4 =225

42.

A force of 10N acts on a body of 2kg for 3s.Find its kinetic energy acquired by the body in 3s.

Answer»

K.E=P^2/2m

=(F×t)^2/2m

=(10×3)^2/2×2

=(30)^2/4

=900/4

=225

Discussion

43.	A convex mirror has radius of curvature 3 metre if the object is located 5m from the mirror find the position nature and size of the imageplz its urgent
Answer» ANS) Radius r = -3m therefore focal length = -3/2m = 1.5 m object DISTANCE U = 5M image distance V =? we know, $\frac{1}{v} + \frac{1}{u} = \frac{1}{f} \\ \frac{1}{v} + \frac{1}{ - 5} = \frac{1}{1.5} \\ \frac{1}{v} = \frac{1}{ - 1.5} - \frac{1}{ - 5} \\ \frac{1}{v} = - 59 - (1.5) \div 7.5 \\ \frac{1}{v} = \frac{ - 6.5}{7.5} \\ v = \frac{7.5}{ - 6.5} \\ v = - 1.15 \\$

Discussion

44.	Large no.of herbivores can be seen in this ecosystema) forest. b) desert. c) mangroove. d) grassland.
Answer» D ONE is your ANSWER

Discussion

45.	Hiii EVERY ONE ❤️ CAN U ANSWER?? HOW CAN THE SUN LIVE SO MANY YEARS AND YEARS...
Answer» » HI DEAR !! » SUN is a natural thing that has been created by god. As it is natural we can't expect that how years the sun is going to live. How many billions ago the sun born and until now it doesn't exist . So, we can conclude that until and UNLESS the god will stay with US that many years & Billions sun is going to live. ★ HOPE IT HELPS !! ★

Discussion

46.	What is meaning of in phase and out of phase in simple harmonic motion?
Answer» Phase is the POSITION of a point in time (an instant) on a WAVEFORM cycle. ... In sinusoidal FUNCTIONS or in waves, "phase" has two different, but closely related, meanings. One is the initial ANGLE of a sinusoidal function at its origin and is sometimes called phase OFFSET or phase difference.

Discussion

47.	What is magnetic susceptibility how is measured for goys method?
Answer» Holmarc's MAGNETIC SUSCEPTIBILITY - Gouy's Method Apparatus (Model No: HO-ED-EM-08) is designed for the determination of magnetic susceptibility of solid samples. ... The magnetic FIELD is measured using a DIGITAL Gauss meter. The sample weight measurements are taken with the help of a Gouy balance.

Discussion

48.	The steam of a hydrometer is made narrow because it
Answer» The STEAM of a hydrometer is made narrow because:- A hydrometer usually consists of a SEALED HOLLOW glass tube with a wider bottom PORTION for buoyancy, a ballast such as lead or mercury for stability,and a narrow stem with graduationsfor measuring. ... The point at which the surface of the liquid touches the stem of the hydrometer correlates to RELATIVE density. I HOPE IT WILL BE HELPFUL FOR YOU.

Discussion

49.	Answer it if you can
Answer» 1. net force on P is F- force by Q and R. ii. p APPLY F+force on P iii. q apply F+force on P+force on Q

Discussion

50.	Write down the si unit of electric flux
Answer» Hey.... Electrical FLUX has SI units of volt meters (V m), or, EQUIVALENTLY, newton meters squared per coulomb (N M2 C−1). THUS, the SI base units of ELECTRIC flux are kg·m3·s−3·A−1.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Main disadvantages of nuclear power generator

Number of ergs contained in one Joule

A car of mass 1000kg first travels forward at 25m/s^2 and then backwards at 15m/s^2. what is the change in the k.E of the car?

What is the formula for electricity?

Velocity of light is minimum in - diamond,water,air ,glass

State the change noticed when blue litmus and red litmus are introduced in the sodium chloride solution

How can we change work done into kinetic energy or potential energy?

The law of constant proportions was given by which scientist

Why clouds appear white ?

If the mass of a body is double then by what percent its Kinetic energy will increased or decreased

The unit of plank's constant is - Nm,eV,J/sec ,JS

Plzzzzzzzzzzzz........answer..... . By which process the tremendous electric charges in the atmosphere which produce sheet lightning in the clouds are produced?

calculate the work done by a passenger standing on a platform holding his suitcase of weight 10 kg weight

Write the factors on which the pressure exerted by a liquid at a point inside the liquid depends?

Which of the following is fundamental quantity - velocity, thermodynamic temperature ,surface tension , viscosity.

if a spring is compressed with energy 25Jule with what velocity an object of mass 2kg start moving which is kept on it

Meaning of quantum physics

In which year did the law of constant proportion was proposed?

How does AC motor work?

Three resistors are connected in parallel , which resistor will be maximum power dissipation

The force required to row a boat at constant velocity is proportional

how much work is done by a force of 10 Newton is moving a body through a distance of 2 minutes Own Direction

Light is an -mechanical wave , elastic wave , electromagnetic wave,matter wave

What kind of lens are used in hyper metropia

The velocity of light in a medium is 1.5×10^8 m/s critical angle of tha medium is - 30°,45°,60°,90°

how much work is done by a force of 10 Newton is in moving a body through distance of 2 minutes own Direction

How 20% is equal to 1.2?

Plzzzzzzzzzzzzz..............answer..............By which process does a charged object attracts an uncharged object by producing opposite charges in the nearer end of the uncharged object?

Calculate theforce which is applied to an area of 2.5 cm^2 to produce a pressure of 20 pascal

Calculate the work done by a passenger standing on a platform holding a suitcase of weight 10 kgwt

What is biot sawart law explain briefly

The engine of a train has to apply a force of 5000n to overcome friction to run at a uniform rate of 90 km/h .What is the power developed by the engine

he'll friends quick answer. 1}. Explain the variation of thermo e m f . with temperature ??

Sun appear elliptical just before sunset beacause of - reflection, refraction, scattering, diffraction

A hunter has a machine gun that can fire 50g bullets with a velocity of 900m/s. A 40Kg tiger springs at him with a velocity of 10m/s how many bullets must the hunter fire into the tiger in order to stop him in his track

State two observation that tells us light travels always In straight light

What do you mean by voltage source and current source inverter?

What do you mean by buoyancy hence define buoyant force?

The centripetal force required to revolve electron around nucleus is given by

A force of 10N acts on a body of 2kg for 3s.Find its kinetic energy acquired by the body in 3s.

A convex mirror has radius of curvature 3 metre if the object is located 5m from the mirror find the position nature and size of the imageplz its urgent

Large no.of herbivores can be seen in this ecosystema) forest. b) desert. c) mangroove. d) grassland.

Hiii EVERY ONE ❤️ CAN U ANSWER?? HOW CAN THE SUN LIVE SO MANY YEARS AND YEARS...

What is meaning of in phase and out of phase in simple harmonic motion?

What is magnetic susceptibility how is measured for goys method?

The steam of a hydrometer is made narrow because it

Answer it if you can

Write down the si unit of electric flux