67486 + Interview Questions in Secondary School in Physics

1.	In what condition if terminal potential difference is equal to emf of cell
Answer» Explanation: emf is the max . potential difference between two electrodesoof the cel when terminal is open WHEREAS terminal potential is the potential difference between two ELECTRODES of CELL when it is closed.V=E-Ir, where I is internal RESISTANCE of cell.✌

1.

In what condition if terminal potential difference is equal to emf of cell

Answer»

Explanation:

emf is the max . potential difference between two electrodesoof the cel when terminal is open WHEREAS terminal potential is the potential difference between two ELECTRODES of CELL when it is closed.V=E-Ir, where I is internal RESISTANCE of cell.✌

Discussion

2.	Consider the acceleration velocity and displacement of a tennis ball
Answer» ANSWER: EXPLANATION: CONSIDER the acceleration velocity and displacement of a TENNIS BALL displacement and velocity

2.

Consider the acceleration velocity and displacement of a tennis ball

Answer»

ANSWER:

EXPLANATION:

CONSIDER the acceleration velocity and displacement of a TENNIS BALL displacement and velocity

Discussion

3.	Difference between internal and external combustion engine'
Answer» Answer: internal COMMUNICATION refers to the communication which takes place among the participants With in the BUSINESS ORGANIZATION on the contrary external communication is a communication that occurs between the organization and other INDIVIDUALS, groups or organizations

3.

Difference between internal and external combustion engine'

Answer»

Answer:

internal COMMUNICATION refers to the communication which takes place among the participants With in the BUSINESS ORGANIZATION on the contrary external communication is a communication that occurs between the organization and other INDIVIDUALS, groups or organizations

Discussion

4.	Difference between fluorescent light and sodium vapour lamp
Answer» Answer: The light in SODIUM vapour LAMP is from an atomic emission process WHEREAS in mercury vapour lamp it is, FINALLY, from fluorescence emission. The mechanism of light emission in a sodium vapour lamp is simple and straight-forward. Explanation: make me as brainaliest answer

4.

Difference between fluorescent light and sodium vapour lamp

Answer»

Answer:

The light in SODIUM vapour LAMP is from an atomic emission process WHEREAS in mercury vapour lamp it is, FINALLY, from fluorescence emission. The mechanism of light emission in a sodium vapour lamp is simple and straight-forward.

Explanation:

make me as brainaliest answer

Discussion

5.	Difference between electrostatic and electromagnetic field
Answer» Answer: A ELECTROSTATIC field is a electric field produced by static electric charges. The charges are static in the sense of CHARGE amount (it is constant in time) and their positions in SPACE (charges are not MOVING relatively to each other). An electromagnetic field is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and DESCRIBES the electromagnetic interaction.

5.

Difference between electrostatic and electromagnetic field

Answer»

Answer:

A ELECTROSTATIC field is a electric field produced by static electric charges. The charges are static in the sense of CHARGE amount (it is constant in time) and their positions in SPACE (charges are not MOVING relatively to each other).

An electromagnetic field is a physical field produced by electrically charged objects. It affects the behavior of charged objects in the vicinity of the field. The electromagnetic field extends indefinitely throughout space and DESCRIBES the electromagnetic interaction.

Discussion

6.	Difference between earth's north and magnetic pole
Answer» Explanation: EARTH's north means the direction shown by the ROTATION of Earth in the axis. But magnetic north means the direction shown by the magnet.

6.

Difference between earth's north and magnetic pole

Answer»

Explanation:

EARTH's north means the direction shown by the ROTATION of Earth in the axis.

But magnetic north means the direction shown by the magnet.

Discussion

7.	3 resistance of 2ohm,3ohm,6ohm are connected in series and in parallel.Calculate the ratio of the effective resistance of series and parallel combination of resistance
Answer» EXPLANATION: series=11 parallel=1

7.

3 resistance of 2ohm,3ohm,6ohm are connected in series and in parallel.Calculate the ratio of the effective resistance of series and parallel combination of resistance

Answer»

EXPLANATION:

series=11

parallel=1

Discussion

8.	Converse of Pythagoras theorem?? I want its proof and its statement?
Answer» $\huge\underline\mathscr{Statement}$ In a triangle, if the square of ONE side is equal to the sum of square of other TWO sides then prove that the triangle is RIGHT angled triangle. ________________________ $\huge\underline\mathscr{Solution}$ Given : AC² = AB² + BC² To prove : ABC is a right angled triangle. Construction : Draw a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR. Proof : In triangle PQR, Angle Q = 90° ( by construction ) Also, PR² = PQ² + QR² ( By using Pythagoras theorem )...(1) But, AC² = AB² + BC² ( Given ) Also, AB = PQ and BC = QR ( by construction ) Therefore, AC² = PQ²+ QR²....(2) From eq (1) and (2), PR² = AC² So, PR = AC Now, In ∆ABC and ∆PQR, AB = PQ ( By construction ) BC = QR ( By construction ) AC = PR ( Proved above ) Hence, ∆ABC is CONGRUENT to ∆PQR by SSS criteria. Therefore, Angle B = Angle Q ( By CPCT ) But, Angle Q = 90° ( By construction ) Therefore, Angle B = 90° Thus, ABC is a right angled triangle with Angle B = 90° ____________________ Hence proved!

8.

Converse of Pythagoras theorem?? I want its proof and its statement?

Answer»

$\huge\underline\mathscr{Statement}$

In a triangle, if the square of ONE side is equal to the sum of square of other TWO sides then prove that the triangle is RIGHT angled triangle.

________________________

$\huge\underline\mathscr{Solution}$

Given : AC² = AB² + BC²

To prove : ABC is a right angled triangle.

Construction : Draw a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR.

Proof : In triangle PQR,

Angle Q = 90° ( by construction )

Also,

PR² = PQ² + QR² ( By using Pythagoras theorem )...(1)

But,

AC² = AB² + BC² ( Given )

Also, AB = PQ and BC = QR ( by construction )

Therefore,

AC² = PQ²+ QR²....(2)

From eq (1) and (2),

PR² = AC²

So, PR = AC

Now,

In ∆ABC and ∆PQR,

AB = PQ ( By construction )

BC = QR ( By construction )

AC = PR ( Proved above )

Hence,

∆ABC is CONGRUENT to ∆PQR by SSS criteria.

Therefore, Angle B = Angle Q ( By CPCT )

But,

Angle Q = 90° ( By construction )

Therefore,

Angle B = 90°

Thus, ABC is a right angled triangle with Angle B = 90°

____________________

Hence proved!

Discussion

9.	Proof of converse of Pythagoras theorem with state ment!.......❤️
Answer» $\huge\underline\mathscr{Statement}$ In a triangle, if the SQUARE of one side is equal to the sum of square of other two sides then PROVE that the triangle is right angled triangle. ________________________ $\huge\underline\mathscr{Solution}$ Given : AC² = AB² + BC² To prove : ABC is a right angled triangle. Construction : Draw a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR. Proof : In triangle PQR, Angle Q = 90° ( by construction ) Also, PR² = PQ² + QR² ( By using Pythagoras theorem )...(1) But, AC² = AB² + BC² ( Given ) Also, AB = PQ and BC = QR ( by construction ) Therefore, AC² = PQ²+ QR²....(2) From eq (1) and (2), PR² = AC² So, PR = AC Now, In ∆ABC and ∆PQR, AB = PQ ( By construction ) BC = QR ( By construction ) AC = PR ( Proved above ) Hence, ∆ABC is congruent to ∆PQR by SSS criteria. Therefore, Angle B = Angle Q ( By CPCT ) But, Angle Q = 90° ( By construction ) Therefore, Angle B = 90° Thus, ABC is a right angled triangle with Angle B = 90° ____________________ Hence proved!

9.

Proof of converse of Pythagoras theorem with state ment!.......❤️

Answer»

$\huge\underline\mathscr{Statement}$

In a triangle, if the SQUARE of one side is equal to the sum of square of other two sides then PROVE that the triangle is right angled triangle.

________________________

$\huge\underline\mathscr{Solution}$

Given : AC² = AB² + BC²

To prove : ABC is a right angled triangle.

Construction : Draw a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR.

Proof : In triangle PQR,

Angle Q = 90° ( by construction )

Also,

PR² = PQ² + QR² ( By using Pythagoras theorem )...(1)

But,

AC² = AB² + BC² ( Given )

Also, AB = PQ and BC = QR ( by construction )

Therefore,

AC² = PQ²+ QR²....(2)

From eq (1) and (2),

PR² = AC²

So, PR = AC

Now,

In ∆ABC and ∆PQR,

AB = PQ ( By construction )

BC = QR ( By construction )

AC = PR ( Proved above )

Hence,

∆ABC is congruent to ∆PQR by SSS criteria.

Therefore, Angle B = Angle Q ( By CPCT )

But,

Angle Q = 90° ( By construction )

Therefore,

Angle B = 90°

Thus, ABC is a right angled triangle with Angle B = 90°

____________________

Hence proved!

Discussion

10.	Both the potantiometer and the voltmeter are used to measure the voltage. Two devices of this type are needed for the same work.
Answer» ANSWER: your question isn't clear. but let see. Explanation: potentiometeR is more reliable than voltmeter because it draws even more less voltage from circuit. it is connected in parallel to circuit. both devices r used to measure voltage. "plz mark answer as brainliest ".

10.

Both the potantiometer and the voltmeter are used to measure the voltage. Two devices of this type are needed for the same work.

Answer»

ANSWER:

your question isn't clear. but let see.

Explanation:

potentiometeR is more reliable than voltmeter because it draws even more less voltage from circuit.

it is connected in parallel to circuit.

both devices r used to measure voltage.

"plz mark answer as brainliest ".

Discussion

11.	Explain independent behaviour of waves
Answer» lndependent behaviour of Waves:-) A wave preserve its individuality while travelling through space.So *when a* *Number of waves TRAVEL through a region at same TIME, each wave travels INDEPENDENTLY of the others* i.e., as if all other waves were absent. That is why, with so many different musical instrument playing simultaneously in a full orchestra , we can STILL identify the NOTE produced by an individual instrument. An important consequence of the independent behaviour of the Waves is the *principle of superposition of waves.*

11.

Explain independent behaviour of waves

Answer»

lndependent behaviour of Waves:-)

A wave

preserve its individuality while travelling through space.So when a Number of waves TRAVEL through a region at same TIME, each wave travels INDEPENDENTLY of the others i.e., as if all other waves were absent. That is why, with so many different musical instrument playing simultaneously in a full orchestra , we can STILL identify the NOTE produced by an individual instrument. An important consequence of the independent behaviour of the Waves is the principle of superposition of waves.

Discussion

12.	In order to increase the kinetic energy of ejected photoelectrons there should be an increase in
Answer» ANSWER: ACCELERATION. HOPE I HELPED you, MATE.

12.

In order to increase the kinetic energy of ejected photoelectrons there should be an increase in

Answer»

ANSWER:

ACCELERATION. HOPE I HELPED you, MATE.

Discussion

13.	In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is
Answer» Answer: In one hour, a BOAT goes 11km along the stream and 5 km against it. Find the speed of the boat in still water. 6; 7; 8; 9 ... it by 1/2(a+b) => 1/2(11+5) = 1/2(16) = 8 km/hr.

13.

In one hour, a boat goes 11 km along the stream and 5 km against the stream. The speed of the boat in still water (in km/hr) is

Answer»

Answer:

In one hour, a BOAT goes 11km along the stream and 5 km against it. Find the speed of the boat in still water. 6; 7; 8; 9 ... it by 1/2(a+b) => 1/2(11+5) = 1/2(16) = 8 km/hr.

Discussion

14.	Cfls reduce wastage and can be fixed in the ordinary bulb holders. What is a cfl?
Answer» Answer: A compact fluorescent LAMP (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to REPLACE an incandescent light bulb; some types fit into light fixtures designed for incandescent BULBS.

14.

Cfls reduce wastage and can be fixed in the ordinary bulb holders. What is a cfl?

Answer»

Answer:

A compact fluorescent LAMP (CFL), also called compact fluorescent light, energy-saving light, and compact fluorescent tube, is a fluorescent lamp designed to REPLACE an incandescent light bulb; some types fit into light fixtures designed for incandescent BULBS.

Discussion

15.	Calculate the heat emitted by a bulb of hundred watt in 1 minute
Answer» Answer 1 MIN = 60 sec Now POWER = 100 watt So HEAT / energy emitted = power ×time= 60×100=6000joule

15.

Calculate the heat emitted by a bulb of hundred watt in 1 minute

Answer»

Answer 1 MIN = 60 sec

Now POWER = 100 watt

So HEAT / energy emitted = power ×time= 60×100=6000joule

Discussion

16.	Difference between alpha beta and gamma metaloxide nanoparticles
Answer» ANSWER: I don't KNOW this answer...........

16.

Difference between alpha beta and gamma metaloxide nanoparticles

Answer»

ANSWER:

I don't KNOW this answer...........

Discussion

17.	Difference between amplitude spectrum and magnitude spectrum
Answer» Answer: Any signal whose amplitude is a function of time has a corresponding frequency spectrum. When the signals are viewed in the form of a frequency spectrum, certain ASPECTS of the signals or the underlying processes PRODUCING them are revealed. In some cases the frequency spectrum may include a distinct peak corresponding to a sine wave component. And additionally there may be peaks corresponding to harmonics of a fundamental peak, indicating a periodic signal which is not simply sinusoidal. The power spectral density (PSD) of the signal describes the power PRESENT in the signal as a function of frequency, per unit frequency. SOMETIMES one encounters an amplitude spectral density (ASD), which is the square root of the PSD. This is useful when the shape of the spectrum is rather constant, since variations in the ASD will then be proportional to variations in the signal's amplitude itself. But it is mathematically preferred to use the PSD, since only in that case is the area under the curve meaningful in terms of actual power over all frequency or over a SPECIFIED bandwidth. In short, when we use the word spectrumor frequency spectrum, we are referring to the magnitude squared of its Fourier transform, which is a bit different from the PSD (See the third paragraph of this section). You may also refer to this question for more clarification of the terms.

17.

Difference between amplitude spectrum and magnitude spectrum

Answer»

Answer:

Any signal whose amplitude is a function of time has a corresponding frequency spectrum. When the signals are viewed in the form of a frequency spectrum, certain ASPECTS of the signals or the underlying processes PRODUCING them are revealed. In some cases the frequency spectrum may include a distinct peak corresponding to a sine wave component. And additionally there may be peaks corresponding to harmonics of a fundamental peak, indicating a periodic signal which is not simply sinusoidal.

The power spectral density (PSD) of the signal describes the power PRESENT in the signal as a function of frequency, per unit frequency. SOMETIMES one encounters an amplitude spectral density (ASD), which is the square root of the PSD. This is useful when the shape of the spectrum is rather constant, since variations in the ASD will then be proportional to variations in the signal's amplitude itself. But it is mathematically preferred to use the PSD, since only in that case is the area under the curve meaningful in terms of actual power over all frequency or over a SPECIFIED bandwidth.

In short, when we use the word spectrumor frequency spectrum, we are referring to the magnitude squared of its Fourier transform, which is a bit different from the PSD (See the third paragraph of this section). You may also refer to this question for more clarification of the terms.

Discussion

18.	Difference between acrtive energy and apparent energy
Answer» ANSWER: The active POWER is the PRODUCT of thevoltage, current and the cosine of THEANGLE between them. Whereas, the reactive power is the product of voltage and current and the sine of theangle between them. The active poweris the real power, and it is measured in watts. While the reactive power is measured in VAR.

18.

Difference between acrtive energy and apparent energy

Answer»

ANSWER:

The active POWER is the PRODUCT of thevoltage, current and the cosine of THEANGLE between them. Whereas, the reactive power is the product of voltage and current and the sine of theangle between them. The active poweris the real power, and it is measured in watts. While the reactive power is measured in VAR.

Discussion

19.	Converse of Pythagoras theorem?? Proof?? Statement???
Answer» $\huge\underline\mathscr{Statement}$ In a triangle, if the square of one side is equal to the sum of square of other two sides then prove that the triangle is right angled triangle. ________________________ $\huge\underline\mathscr{Solution}$ Given : AC² = AB² + BC² To prove : ABC is a right angled triangle. CONSTRUCTION : DRAW a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR. Proof : In triangle PQR, Angle Q = 90° ( by construction ) Also, PR² = PQ² + QR² ( By using Pythagoras theorem )...(1) But, AC² = AB² + BC² ( Given ) Also, AB = PQ and BC = QR ( by construction ) Therefore, AC² = PQ²+ QR²....(2) From eq (1) and (2), PR² = AC² So, PR = AC Now, In ∆ABC and ∆PQR, AB = PQ ( By construction ) BC = QR ( By construction ) AC = PR ( Proved above ) Hence, ∆ABC is congruent to ∆PQR by SSS criteria. Therefore, Angle B = Angle Q ( By CPCT ) But, Angle Q = 90° ( By construction ) Therefore, Angle B = 90° Thus, ABC is a right angled triangle with Angle B = 90° ____________________ Hence proved!

19.

Converse of Pythagoras theorem?? Proof?? Statement???

Answer»

$\huge\underline\mathscr{Statement}$

In a triangle, if the square of one side is equal to the sum of square of other two sides then prove that the triangle is right angled triangle.

________________________

$\huge\underline\mathscr{Solution}$

Given : AC² = AB² + BC²

To prove : ABC is a right angled triangle.

CONSTRUCTION : DRAW a right angled triangle PQR such that, angle Q = 90°, AB = PQ, BC = QR.

Proof : In triangle PQR,

Angle Q = 90° ( by construction )

Also,

PR² = PQ² + QR² ( By using Pythagoras theorem )...(1)

But,

AC² = AB² + BC² ( Given )

Also, AB = PQ and BC = QR ( by construction )

Therefore,

AC² = PQ²+ QR²....(2)

From eq (1) and (2),

PR² = AC²

So, PR = AC

Now,

In ∆ABC and ∆PQR,

AB = PQ ( By construction )

BC = QR ( By construction )

AC = PR ( Proved above )

Hence,

∆ABC is congruent to ∆PQR by SSS criteria.

Therefore, Angle B = Angle Q ( By CPCT )

But,

Angle Q = 90° ( By construction )

Therefore,

Angle B = 90°

Thus, ABC is a right angled triangle with Angle B = 90°

____________________

Hence proved!

Discussion

20.	A ship submerges more as it sails from sea water to river water. Explain.
Answer» A ship submerges more as it sails from seawater to river WATER because of the upthrust. Explanation: The DENSITY of seawater is more than that of the river water. This is because of the dissolved SALT which is present in seawater. Since the upthrust on the upward force which the water or the liquid exerts on the ship is dependent on the density of the water hence in case of seawater it is more. In case of river water the density is LESSER and as a result of this the upthrust is also less. hence the ship submerges more as it sails from seawater to river water due to INCREASE in the upthrust in seawater. To know more about upthrust, Define buoyancy explain the law of floatation based on it - Brainly.in brainly.in/question/8972371

20.

A ship submerges more as it sails from sea water to river water. Explain.

Answer»

A ship submerges more as it sails from seawater to river WATER because of the upthrust.

Explanation:

The DENSITY of seawater is more than that of the river water. This is because of the dissolved SALT which is present in seawater.

Since the upthrust on the upward force which the water or the liquid exerts on the ship is dependent on the density of the water hence in case of seawater it is more.

In case of river water the density is LESSER and as a result of this the upthrust is also less. hence the ship submerges more as it sails from seawater to river water due to INCREASE in the upthrust in seawater.

To know more about upthrust,

Define buoyancy explain the law of floatation based on it - Brainly.in

brainly.in/question/8972371

Discussion

21.	the resistance of a wire of length 60cm and of uniform area of cross section 0.001 CM square is found to be 0.75 ohm calculate the specific resistance of the wire
Answer» ANSWER: ajsnjejnensnswkehrndnxjengahdhehudwjsjddndisnskdjksjeix

21.

the resistance of a wire of length 60cm and of uniform area of cross section 0.001 CM square is found to be 0.75 ohm calculate the specific resistance of the wire

Answer»

ANSWER:

ajsnjejnensnswkehrndnxjengahdhehudwjsjddndisnskdjksjeix

Discussion

22.	a gun mounted on the top of a moving truck is aimed in the backward direction at angle of 30° to the vertical .if the muzzle velocity of the gun is 4m/s,speed of the truck to send the bullet vertically up is?
Answer» ANSWER: EXPLANATION:HOPE this HELPS you!

22.

a gun mounted on the top of a moving truck is aimed in the backward direction at angle of 30° to the vertical .if the muzzle velocity of the gun is 4m/s,speed of the truck to send the bullet vertically up is?

Answer»

ANSWER:

EXPLANATION:HOPE this HELPS you!

Discussion

23.	In caseof a stretched rubber band the work done by it in returning to its original shape
Answer» Answer: Rubber bands are not much like springs. If you hold one touching your lips (for heat sensitivity) you will NOTICE it warms when stretched and cools when RELEASED quite dramatically. If you measure the WORK in a rapid stretch and release you GET a DIFFERENT result than from

23.

In caseof a stretched rubber band the work done by it in returning to its original shape

Answer»

Answer:

Rubber bands are not much like springs. If you hold one touching your lips (for heat sensitivity) you will NOTICE it warms when stretched and cools when RELEASED quite dramatically. If you measure the WORK in a rapid stretch and release you GET a DIFFERENT result than from

Discussion

24.	A car moves with velocity 10 m/s towards east in 5s,its velocity changes to 10m/s towards north. Then the change in velocity of car is
Answer» Answer: The change in velocity of the car is 10√2 m/s Explanation: According to the problem the velocity of the car while moving TOWARDS East is 10 m/s. The velocity of the car while moving towards North is 10 m/s The change in direction TOOK place after 5 sec Therefore the change is velocity is: √(INITIAL velocity)^2 + (final velocity)^2 = √(10)^2 + (10)^2 = 10√2 m/s Hence the answer is 10√2 m/s

24.

A car moves with velocity 10 m/s towards east in 5s,its velocity changes to 10m/s towards north. Then the change in velocity of car is

Answer»

Answer:

The change in velocity of the car is 10√2 m/s

Explanation:

According to the problem the velocity of the car while moving TOWARDS East is 10 m/s.

The velocity of the car while moving towards North is 10 m/s

The change in direction TOOK place after 5 sec

Therefore the change is velocity is: √(INITIAL velocity)^2 + (final velocity)^2

= √(10)^2 + (10)^2

= 10√2 m/s

Hence the answer is 10√2 m/s

Discussion

25.	How would you write 2 molecules of oxygen and 5 molecules of Nitrogen
Answer» Answer: 2O_2 5N_2 Explanation: _ MEANS SUBSCRIPT

25.

How would you write 2 molecules of oxygen and 5 molecules of Nitrogen

Answer»

Answer:

2O_2

5N_2

Explanation:

_ MEANS SUBSCRIPT

Discussion

26.	TygA point which has velocities represented by 7, 8and 13 is at rest. Find the angle between thedirection of two smaller velocities.
Answer» ANSWER: TYG not UNDERSTANDING....

26.

TygA point which has velocities represented by 7, 8and 13 is at rest. Find the angle between thedirection of two smaller velocities.

Answer»

ANSWER:

TYG not UNDERSTANDING....

Discussion

27.	If there is change in the velocity of the object then the state of object with respect to motion is
Answer» ACCELERATION my FRIEND

Discussion

28.	Base area and volume of a solid cylinder area 13.85 cm^2 and 69.3 cm^3 respectively.Find its height
Answer» Answer: EXPLANATION: volume =1584 height =14 v=πr^h =22/7R14=1584 22/7r=1584/14 R=1584/147/22 r=1584/44 =792/22 =396/11 =36 radius 36 TSA =2πr(r+h) =222/736(36+14) =44/73650 =44/7180 =6.28*180 =113.04 cm

28.

Base area and volume of a solid cylinder area 13.85 cm^2 and 69.3 cm^3 respectively.Find its height

Answer»

Answer:

EXPLANATION:

volume =1584

height =14

v=πr^h

=22/7*R*14=1584

22/7r=1584/14

R=1584/14*7/22

r=1584/44

=792/22

=396/11

=36

radius 36

TSA =2πr(r+h)

=2*22/7*36(36+14)

=44/7*36*50

=44/7*180

=6.28*180

=113.04 cm

Discussion

29.	If the velocityof a body changes it must have some acceleration
Answer» yes it will have MOTION which depends how MUCH velocity is CHANGING in a second

Discussion

30.	A water jet whose cross sectional area is a strikes a wall making an angle theta with the normal and rebounds elastically. The velocity of water of density d is v. What is the force exerted on wall
Answer» answer : 2dav²cosθ explanation : given, area of cross sectional of water jet = a density of water = d velocity of water = V mass of water, m = density of water × VOLUME of water = d × (x × a) = dax [ here x is length of water FLOWING through the water jet ] a/c to question, A water jet whose cross sectional area is a strike a wall MAKING an angle θ with normal and rebounds elastically as shown in FIGURE. so, change in momentum, ∆P = mvcosθ- (-mvcosθ) = 2mvcosθ putting, m = dax so, ∆P = 2daxvcosθ force exerted on wall = change in momentum/time = 2daxvcosθ/t = 2davcosθ (x/t) = 2davcosθ (v) = 2dav²cosθ

30.

A water jet whose cross sectional area is a strikes a wall making an angle theta with the normal and rebounds elastically. The velocity of water of density d is v. What is the force exerted on wall

Answer»

answer : 2dav²cosθ

explanation : given, area of cross sectional of water jet = a

density of water = d

velocity of water = V

mass of water, m = density of water × VOLUME of water

= d × (x × a) = dax [ here x is length of water FLOWING through the water jet ]

a/c to question,

A water jet whose cross sectional area is a strike a wall MAKING an angle θ with normal and rebounds elastically as shown in FIGURE.

so, change in momentum, ∆P = mvcosθ- (-mvcosθ)

= 2mvcosθ

putting, m = dax

so, ∆P = 2daxvcosθ

force exerted on wall = change in momentum/time

= 2daxvcosθ/t

= 2davcosθ (x/t)

= 2davcosθ (v)

= 2dav²cosθ

Discussion

31.	2 sources of electrostatic charges
Answer» ANSWER: MAKE ME BRAINLIST PLEASE.....

31.

2 sources of electrostatic charges

Answer»

ANSWER:

MAKE ME BRAINLIST PLEASE.....

Discussion

32.	A wire of length 1.5m and uniform cross section 6×10^-7m^2 has a resistance of 5ohms what is the resistivity of the material of the wire
Answer» EXPLANATION: sebdjdidkr neskjsskd

32.

A wire of length 1.5m and uniform cross section 6×10^-7m^2 has a resistance of 5ohms what is the resistivity of the material of the wire

Answer»

EXPLANATION:

sebdjdidkr neskjsskd

Discussion

33.	A train 100m long takes 5 seconds to paass a standing man.Find the time take by train in crossng a platform of 360 mts
Answer» Answer: 23 seconds Explanation: Distance COVERED by train to pass the man = Length of train = 100 m Speed = Distance / TIME = 100 m / 5 s = 20 m/s Length of train = 100 m Length of platform = 360 m Distance covered by train to COMPLETELY cross the platform = 100 m + 360 m = 460 m Time = Distance / Speed = 460 m / (20 m/s) = 23 s

33.

A train 100m long takes 5 seconds to paass a standing man.Find the time take by train in crossng a platform of 360 mts

Answer»

Answer:

23 seconds

Explanation:

Distance COVERED by train to pass the man = Length of train = 100 m

Speed = Distance / TIME

= 100 m / 5 s

= 20 m/s

Length of train = 100 m

Length of platform = 360 m

Distance covered by train to COMPLETELY cross the platform = 100 m + 360 m = 460 m

Time = Distance / Speed

= 460 m / (20 m/s)

= 23 s

Discussion

34.	Define the term electric energy write an expression for it
Answer» *ELECTRIC*.. ENERGY..* Electrical energy is energy DERIVED from ELECTRIC POTENTIAL energy or kinetic energy. When used loosely, electrical energy refers to energy that has been CONVERTED from electric potential energy. This energy is supplied by the combination of electric current and electric potential that is DELIVERED by an electrical circuit (e.g., provided by an electric power utility). At the point that this electric potential energy has been converted to another type of energy, it ceases to be electric potential energy. Thus, all electrical energy is potential energy before it is delivered to the end-use. Once converted from potential energy, electrical energy can always be called another type of energy (heat, light, motion, etc... *EXPRESSION*..OF..THE .. ELECTRIC.. ENERGY..".. The formula that links energy and power is: Energy = Power x Time. ... Note: if an appliance has a rating of one watt it means it converts one joule of electrical energy to some other form every second. Because the joule is such a small unit, quantities of energy are often given in kilojoules. I.e, thousands of joules...*""###.. . ... hope..it..might..help..you..

34.

Define the term electric energy write an expression for it

Answer»

ELECTRIC.. ENERGY..*

Electrical energy is energy DERIVED from ELECTRIC POTENTIAL energy or kinetic energy. When used loosely, electrical energy refers to energy that has been CONVERTED from electric potential energy. This energy is supplied by the combination of electric current and electric potential that is DELIVERED by an electrical circuit (e.g., provided by an electric power utility). At the point that this electric potential energy has been converted to another type of energy, it ceases to be electric potential energy. Thus, all electrical energy is potential energy before it is delivered to the end-use. Once converted from potential energy, electrical energy can always be called another type of energy (heat, light, motion, etc...

EXPRESSION..OF..THE .. ELECTRIC.. ENERGY.."..

The formula that links energy and power is: Energy = Power x Time. ... Note: if an appliance has a rating of one watt it means it converts one joule of electrical energy to some other form every second. Because the joule is such a small unit, quantities of energy are often given in kilojoules. I.e, thousands of joules...*""###..

.

...

hope..it..might..help..you..

Discussion

35.	Define the terms osmosis and osmotic pressure of a solution
Answer» Osmosis is defined as the net flow or movement of SOLVENT MOLECULES through a semipermeable MEMBRANE through which solute molecules cannot pass. ... The height difference between the two sides can be be converted into pressure to find the OSMOTIC pressure exerted on the solution by the PURE solvent.

Discussion

36.	Define the term 'dielectric strength'. What does this term signify?
Answer» *Dielectric strength*.. ##..In physics, the term dielectric strength has the following meanings: ⁕Of an insulating MATERIAL, the maximum electric field strength that it can withstand intrinsically without breaking down, i.e., without experiencing failure of its insulating properties. ⁕For a given configuration of dielectric material and electrodes, the minimum electric field that produces breakdown. ⁕the maximum electric stress the dielectric material can withstand without breakdown. The theoretical dielectric strength of a material is an INTRINSIC property of the bulk material and is DEPENDENT on the configuration of the material or the electrodes with which the field is applied. At breakdown, the electric field FREES bound electrons. If the applied electric field is sufficiently high, free electrons from background radiation may become accelerated to velocities that can liberate additional electrons during collisions with neutral atoms or molecules in a process called AVALANCHE breakdown. Breakdown occurs quite abruptly, resulting in the formation of an electrically conductive path and a disruptive discharge through the material. For solid materials, a breakdown event severely degrades, or even destroys, its insulating capability...

36.

Define the term 'dielectric strength'. What does this term signify?

Answer»

Dielectric strength..

##..In physics, the term dielectric strength has the following meanings: ⁕Of an insulating MATERIAL, the maximum electric field strength that it can withstand intrinsically without breaking down, i.e., without experiencing failure of its insulating properties. ⁕For a given configuration of dielectric material and electrodes, the minimum electric field that produces breakdown. ⁕the maximum electric stress the dielectric material can withstand without breakdown. The theoretical dielectric strength of a material is an INTRINSIC property of the bulk material and is DEPENDENT on the configuration of the material or the electrodes with which the field is applied. At breakdown, the electric field FREES bound electrons. If the applied electric field is sufficiently high, free electrons from background radiation may become accelerated to velocities that can liberate additional electrons during collisions with neutral atoms or molecules in a process called AVALANCHE breakdown. Breakdown occurs quite abruptly, resulting in the formation of an electrically conductive path and a disruptive discharge through the material. For solid materials, a breakdown event severely degrades, or even destroys, its insulating capability...

Discussion

37.	The average displacement over a period of shm is _ .
Answer» ANSWER: displacement normally refers to a change in position when an object moves from POINT A to point B, but often in SHM (I assume this stands for simple harmonic MOTION), displacement can also mean displacement from equilibrium position which is simply the position or distance an object is from its equilibrium position ...May 6, 2017

37.

The average displacement over a period of shm is _ .

Answer»

ANSWER:

displacement normally refers to a change in position when an object moves from POINT A to point B, but often in SHM (I assume this stands for simple harmonic MOTION), displacement can also mean displacement from equilibrium position which is simply the position or distance an object is from its equilibrium position ...May 6, 2017

Discussion

38.	3. The radiation emitted by a star A is 10000 times that of thesun. If the surface temperatures of the sun and star A are6000 K and 2000 K respectively, the ratio of the radii ofthe star A and the sun is:(a) 300: 1(b) 600:1(c) 900:1(d) 1200:1
Answer» the ANSWER of this QUESTION is 4

Discussion

39.	A pushing force of 50 N acts on a block at angle of 30 with horizontal.The respective horizontal and vertical components of force will be
Answer» ANSWER: a pushing force of 50 N acts Explanation: the ANGLE of horizontal

39.

A pushing force of 50 N acts on a block at angle of 30 with horizontal.The respective horizontal and vertical components of force will be

Answer»

ANSWER:

a pushing force of 50 N acts

Explanation:

the ANGLE of horizontal

Discussion

40.	a) An object weighs 0.027 kg in air. Its material has a density of 2.7 x 103 kg/m3. What would be the apparent weight of the object if it were immersed in a liquid of 900 kg/m3?
Answer» Answer: For AIR at 20°C = 293 K and 7000 PA, the DENSITY is ρ = p/RT = (7000)/[(287)(293)] = 0.0832 kg/m3. From Table A-2, its viscosity is ... IMAGES

40.

a) An object weighs 0.027 kg in air. Its material has a density of 2.7 x 103 kg/m3. What would be the apparent weight of the object if it were immersed in a liquid of 900 kg/m3?

Answer»

Answer:

For AIR at 20°C = 293 K and 7000 PA, the DENSITY is ρ = p/RT = (7000)/[(287)(293)] = 0.0832 kg/m3. From Table A-2, its viscosity is ...

IMAGES

Discussion

41.	A thief drives at the speed of x km/hr. The policemen started chasing him after 4 hours and catches him in 4 hours. Find the speed of the thief if the speed of the policemen is 40 km/hr?
Answer» ANSWER: then travels the next 160 km at the speed of 80 km/hr. What is the AVERAGE speed for the first 320 km. 10). A thief running at speed of 8 km/hour is chased by a POLICEMAN at a speed of 10 km/hour.

41.

A thief drives at the speed of x km/hr. The policemen started chasing him after 4 hours and catches him in 4 hours. Find the speed of the thief if the speed of the policemen is 40 km/hr?

Answer»

ANSWER:

then travels the next 160 km at the speed of 80 km/hr. What is the AVERAGE speed for the first 320 km. 10). A thief running at speed of 8 km/hour is chased by a POLICEMAN at a speed of 10 km/hour.

Discussion

42.	A stone is projected vertically upwards. When it reaches half the maximum height, its velocity is 20 m/s. What is the maximum height attained by the stone? (g 10 m/s (1) 20 m (2) 25 m (3) 30 m (4) 40
Answer» Given Velocity of STONE at $\dfrac{s}{2}$ is 20 m/s To find The maximum height attained by the stone (s). Solution v = Final velocity u = Initial velocity s = Displacement Kinematic equations of MOTION have been used here For half the maximum height we have v = 20 m/s $s=\dfrac{s}{2}$ $v^2-u^2=2as\\\Rightarrow 20^2-u^2=2\times-10\times\dfrac{s}{2}\\\Rightarrow u^2=400+10s$ For maximum height v = 0 s = s $v^2-u^2=2as\\\Rightarrow 0^2-(400+10s)=2\times -9.81\times s\\\Rightarrow -400-10s=2\times -10\times s\\\Rightarrow -400=2\times -10\times s+10s\\\Rightarrow s=\dfrac{-400}{2\times -10+10}\\\Rightarrow s=<klux>40</klux>\ \text{m}$ Maximum height reached by the stone is (4) 40 m.

42.

A stone is projected vertically upwards. When it reaches half the maximum height, its velocity is 20 m/s. What is the maximum height attained by the stone? (g 10 m/s (1) 20 m (2) 25 m (3) 30 m (4) 40

Answer»

Given

Velocity of STONE at $\dfrac{s}{2}$ is 20 m/s

To find

The maximum height attained by the stone (s).

Solution

v = Final velocity

u = Initial velocity

s = Displacement

Kinematic equations of MOTION have been used here

For half the maximum height we have

v = 20 m/s

$s=\dfrac{s}{2}$

$v^2-u^2=2as\\\Rightarrow 20^2-u^2=2\times-10\times\dfrac{s}{2}\\\Rightarrow u^2=400+10s$

For maximum height

v = 0

s = s

$v^2-u^2=2as\\\Rightarrow 0^2-(400+10s)=2\times -9.81\times s\\\Rightarrow -400-10s=2\times -10\times s\\\Rightarrow -400=2\times -10\times s+10s\\\Rightarrow s=\dfrac{-400}{2\times -10+10}\\\Rightarrow s=<klux>40</klux>\ \text{m}$

Maximum height reached by the stone is (4) 40 m.

Discussion

43.	Telugu what is English meaning
Answer» EXPLANATION: In ENGLISH ALSO we CALL TELUGU as telugu itself .

43.

Telugu what is English meaning

Answer»

EXPLANATION:

In ENGLISH ALSO we CALL TELUGU as telugu itself .

Discussion

44.	A spring toy weighing 1 kg on a spring balance suddenly jumps upwards a boy standing near the toy noticesthat the scale of the balance reads 1.05 kg in this process the maximum acceration of the toy is
Answer» Answer: The maximum acceleration of the TOY is 0.5 m/s² Explanation: Mass of the toy m = 1 kg Mass recorded when the toy JUMPS upwards m' = 1.05 kg Similar to the MOTION inside the lifts, when the toy jumps upwards then if the acceleration of the toy is a then NET weight of the toy will be $W'=m(a+g)$ $W'=m(a+g)$ But $W'= m'g$ Therefore, $m(a+g)= m'g$ $\implies 1(a+10)= 1.05\times 10$ $\implies a+10= 10.5$ $\implies a= 10.5-10$ $\implies a= 0.5$ m/s² Thus, the maximum acceleration of the toy is 0.5 m/s² Hope this helps.

44.

A spring toy weighing 1 kg on a spring balance suddenly jumps upwards a boy standing near the toy noticesthat the scale of the balance reads 1.05 kg in this process the maximum acceration of the toy is

Answer»

Answer:

The maximum acceleration of the TOY is 0.5 m/s²

Explanation:

Mass of the toy m = 1 kg

Mass recorded when the toy JUMPS upwards m' = 1.05 kg

Similar to the MOTION inside the lifts, when the toy jumps upwards then if the acceleration of the toy is a then NET weight of the toy will be

$W'=m(a+g)$

But $W'= m'g$

Therefore, $m(a+g)= m'g$

$\implies 1(a+10)= 1.05\times 10$

$\implies a+10= 10.5$

$\implies a= 10.5-10$

$\implies a= 0.5$ m/s²

Thus, the maximum acceleration of the toy is 0.5 m/s²

Hope this helps.

Discussion

45.	A ship a is moving westwards with a speed of 10 km h–1 and a ship b 100 km south of a, is movingnorthwards with a speed of 10 km h–1. The time after which the distance betwee
Answer» EXPLANATION: DONE ANSWER is 5hours ans is 5H

45.

A ship a is moving westwards with a speed of 10 km h–1 and a ship b 100 km south of a, is movingnorthwards with a speed of 10 km h–1. The time after which the distance betwee

Answer»

EXPLANATION:

DONE ANSWER is 5hours

ans is 5H

Discussion

46.	2. Why do we observe winds blowing towardsthe equator?
Answer» ANSWER: Prevailing WINDS are winds thatblow from a SINGLE direction over a specific area of the Earth. Warmequatorial air rises higher into the atmosphere and migrates toward the poles. This is a low pressure SYSTEM at the same time cooler denser air MOVES over earth's surface toward the equator toreplace the heated air. i think it helpful for u

46.

2. Why do we observe winds blowing towardsthe equator?

Answer»

ANSWER:

Prevailing WINDS are winds thatblow from a SINGLE direction over a specific area of the Earth. Warmequatorial air rises higher into the atmosphere and migrates toward the poles. This is a low pressure SYSTEM at the same time cooler denser air MOVES over earth's surface toward the equator toreplace the heated air.

i think it helpful for u

Discussion

47.	State the unit of mass in CGS and Si system
Answer» Answer: in CGS MASS is gram in SI SYSTEM mass is kilogram (kg)

47.

State the unit of mass in CGS and Si system

Answer»

Answer:

in CGS MASS is gram

in SI SYSTEM mass is kilogram (kg)

Discussion

48.	which of the following will have higher pitch the cry of baby or the voice of a new normal human male? why
Answer» Answer: cry of a BABY has a HIGHER pitch than the voice of a new normal MALE HUMAN being

48.

which of the following will have higher pitch the cry of baby or the voice of a new normal human male? why

Answer»

Answer:

cry of a BABY has a HIGHER pitch than the voice of a new normal MALE HUMAN being

Discussion

49.	An atom absorbs 2e V energy and is excitedto next energy state. The wavelength of lightabsorbed will be1) 2000 A.3) 8000 A2) 4000 A.4) 6206 A
Answer» ANSWER: 2 OPTION is CORRECT answer

49.

An atom absorbs 2e V energy and is excitedto next energy state. The wavelength of lightabsorbed will be1) 2000 A.3) 8000 A2) 4000 A.4) 6206 A

Answer»

ANSWER:

2 OPTION is CORRECT answer

Discussion

50.	This question is related to physics.The ten birds was sit to electric wire the ten birds was didn't died why or current flow in wire
Answer» ANSWER: can you SPELL it CORRECTLY BRO

50.

This question is related to physics.The ten birds was sit to electric wire the ten birds was didn't died why or current flow in wire

Answer»

ANSWER:

can you SPELL it CORRECTLY BRO

Discussion

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