67486 + Interview Questions in Secondary School in Physics

1.	Who is the father of nuclear pbysics?
Answer» Explanation: Ernest RUTHERFORD The RIGHT Honourable The Lord Rutherford of NELSON OM PRS HonFRSE Born 30 August 1871 Brightwater, COLONY of New Zealand Died 19 October 1937 (aged 66) Cambridge, England Citizenship British subject Nationality New Zealande

1.

Who is the father of nuclear pbysics?

Answer»

Explanation:

Ernest RUTHERFORD

The RIGHT Honourable The Lord Rutherford of NELSON OM PRS HonFRSE

Born 30 August 1871 Brightwater, COLONY of New Zealand

Died 19 October 1937 (aged 66) Cambridge, England

Citizenship British subject

Nationality New Zealande

Discussion

2.	A student walking in school corridor with school bag on shoulders state whether work is not or not
Answer» ANSWER: No work is said to be done Explanation: Because the STUDENT is only WALKING in the corridor is not reached the PLACE

2.

A student walking in school corridor with school bag on shoulders state whether work is not or not

Answer»

ANSWER:

No work is said to be done

Explanation:

Because the STUDENT is only WALKING in the corridor is not reached the PLACE

Discussion

3.	Define cumulative frequency
Answer» Answer: Cumulative frequency is USED to determine the NUMBER of observations that lie above (or below) a particular value in a DATA set. ... The cumulative frequency is CALCULATED by adding each frequency from a frequency distribution table to the sum of its predecessors

3.

Define cumulative frequency

Answer»

Answer:

Cumulative frequency is USED to determine the NUMBER of observations that lie above (or below) a particular value in a DATA set. ... The cumulative frequency is CALCULATED by adding each frequency from a frequency distribution table to the sum of its predecessors

Discussion

4.	a charge 120 micro coulomb is subdivided into two parts so that when kept at certain distance the force between them may be maximum. how should we divide it.
Answer» ANSWER: HSBS dbdbd djdb dbdbdbdbd d bebebe R RB

4.

a charge 120 micro coulomb is subdivided into two parts so that when kept at certain distance the force between them may be maximum. how should we divide it.

Answer»

ANSWER:

HSBS dbdbd djdb dbdbdbdbd d bebebe R RB

Discussion

5.	A parallel beam of light falls on a converging lens. Which diagram shows what happens to the beam of light?
Answer» Explanation: the rays all CONVERGE at FOCUS , i.e, at 20cm from lens (10CM from screen) now the length of side be s RATIO of sides =ratio of distance of focus from lens to the distance of focus from screen s 1 = 10 20 s=0.5cm, and the image is inverted, hence option D is correct

5.

A parallel beam of light falls on a converging lens. Which diagram shows what happens to the beam of light?

Answer»

Explanation:

the rays all CONVERGE at FOCUS , i.e, at 20cm from lens (10CM from screen)

now the length of side be s

RATIO of sides =ratio of distance of focus from lens to the distance of focus

from screen

s

1

=

10

20

s=0.5cm, and the image is inverted, hence option D is correct

Discussion

6.	The pH of an aqueous solution decrease from 3to2 what will happen to the nature of the solution ?
Answer» ANSWER: more acidic. Explanation: The SOLUTION will BECOME more acidic. mark as BRAINLIEST

6.

The pH of an aqueous solution decrease from 3to2 what will happen to the nature of the solution ?

Answer»

ANSWER:

more acidic.

Explanation:

The SOLUTION will BECOME more acidic.

mark as BRAINLIEST

Discussion

7.	A lift moves (i) and (ii) down with an acceleration of 2m/s^2. In each case, calculate the reaction of the floor on a mab of mass 50 kg standing in lift?
Answer» ANSWER: N−mg=ma N−(50×9.8)=(50×0.49) N=514.5 NEWTON.

7.

A lift moves (i) and (ii) down with an acceleration of 2m/s^2. In each case, calculate the reaction of the floor on a mab of mass 50 kg standing in lift?

Answer»

ANSWER:

N−mg=ma

N−(50×9.8)=(50×0.49)

N=514.5 NEWTON.

Discussion

8.	On which temperature the degree fahrenheit and degree celsius both are equal
Answer» Answer: Celsius and Fahrenheit are TWO temperature SCALES. The Fahrenheit and Celsius scales have one point at which they intersect. They are EQUAL at -40 °C and -40 °F.

8.

On which temperature the degree fahrenheit and degree celsius both are equal

Answer»

Answer:

Celsius and Fahrenheit are TWO temperature SCALES. The Fahrenheit and Celsius scales have one point at which they intersect. They are EQUAL at -40 °C and -40 °F.

Discussion

9.	17.) A ball is kicked with a speed of 20 m s-1 at an angle of 45° with the horizontal.(a) Find the time taken by the ball to strikethe ground,(b) Calculate the maximum height reachedby the ball, and(c) How far away from the kick point doesthe ball hit the ground?Ano ml
Answer» Answer: the best for you to protect me from the best for you and I am not sure if you have any questions paper send me the best the best the best way for the effective implementation and support to protect against computer viruses EMAIL programs may prevent sending or receiving CERTAIN TYPES of file attachments is intended only for the effective implementation and maintenance of the effective implementation in the FOLLOWING sentence of 10 Standard if you have received this email programs of study is right answer any situation and the effective is the big picture is right the best for the following questions in the above the following link for the best of the bestest is right is right the best in each in is right

9.

17.) A ball is kicked with a speed of 20 m s-1 at an angle of 45° with the horizontal.(a) Find the time taken by the ball to strikethe ground,(b) Calculate the maximum height reachedby the ball, and(c) How far away from the kick point doesthe ball hit the ground?Ano ml

Answer»

Answer:

the best for you to protect me from the best for you and I am not sure if you have any questions paper send me the best the best the best way for the effective implementation and support to protect against computer viruses EMAIL programs may prevent sending or receiving CERTAIN TYPES of file attachments is intended only for the effective implementation and maintenance of the effective implementation in the FOLLOWING sentence of 10 Standard if you have received this email programs of study is right answer any situation and the effective is the big picture is right the best for the following questions in the above the following link for the best of the bestest is right is right the best in each in is right

Discussion

10.	What's the difference between micro and macro
Answer» $\huge\mathbb\purple{A}\mathbb\blue{N}\mathbb\red{S}\mathbb\green{W}\mathbb\pink{E}\mathbb\purple{R}\blue{:-}$ Microeconomics STUDIES individuals and business decisions, while macroeconomics analyzes the decisions made by COUNTRIES and governments. Microeconomics focuses on supply and DEMAND, and other forces that DETERMINE price levels, making it a bottom-up APPROACH.

10.

What's the difference between micro and macro

Answer»

$\huge\mathbb\purple{A}\mathbb\blue{N}\mathbb\red{S}\mathbb\green{W}\mathbb\pink{E}\mathbb\purple{R}\blue{:-}$

Microeconomics STUDIES individuals and business decisions, while macroeconomics analyzes the decisions made by COUNTRIES and governments. Microeconomics focuses on supply and DEMAND, and other forces that DETERMINE price levels, making it a bottom-up APPROACH.

Discussion

11.	From a rifle of mass 4 kg , a bullet of mass 50 g is fired with an initial velocity of 35 MpSCALCULATE THE INITIAL RECOIL VELOCITY OF THE RIFLE
Answer» EXPLANATION: I HOPE it will be HELP FULL for you

11.

From a rifle of mass 4 kg , a bullet of mass 50 g is fired with an initial velocity of 35 MpSCALCULATE THE INITIAL RECOIL VELOCITY OF THE RIFLE

Answer»

EXPLANATION:

I HOPE it will be HELP FULL for you

Discussion

12.	Diffrent between apprent and real expansion
Answer» Answer: APPARENT Expansion MEANS the THERMAL expansion of a liquid as measured in a graduated container WITHOUT allowance for the expansion of the container. The real expansion of the liquid = Apparent expansion of the liquid + VOLUME expansion of the container.

12.

Diffrent between apprent and real expansion

Answer»

Answer:

APPARENT Expansion MEANS the THERMAL expansion of a liquid as measured in a graduated container WITHOUT allowance for the expansion of the container. The real expansion of the liquid = Apparent expansion of the liquid + VOLUME expansion of the container.

Discussion

13.	What are adventages Of Using CNG as fuels
Answer» ANSWER: CHEAPER than OIL, GOOD for ENVIRONMENT,

13.

What are adventages Of Using CNG as fuels

Answer»

ANSWER:

CHEAPER than OIL,

GOOD for ENVIRONMENT,

Discussion

14.	What is the impact on system when we add heat on it?
Answer» Answer: $\huge\mathfrak\pink{Answer:-}$ Adding heat to a system increases the system's total energy. This gives more KINETIC energy to distribute among the PARTICLES in the system, increasing the SIZE of the system's phase SPACE and hence its entropy. Explanation: *Mark* it as *the* *brainliest*!!

14.

What is the impact on system when we add heat on it?

Answer»

Answer:

$\huge\mathfrak\pink{Answer:-}$

Adding heat to a system increases the system's total energy. This gives more KINETIC energy to distribute among the PARTICLES in the system, increasing the SIZE of the system's phase SPACE and hence its entropy.

Explanation:

Mark it as the brainliest!!

Discussion

15.	What is the impact on system when we add heat on it? -------[for 3 marks]
Answer» Adding heat to a SYSTEM increases the system's total energy. This GIVES more KINETIC energy to distribute AMONG the PARTICLES in the system, increasing the size of the system's phase space and hence its entropy.

15.

What is the impact on system when we add heat on it? -------[for 3 marks]

Answer»

Adding heat to a SYSTEM increases the system's total energy. This GIVES more KINETIC energy to distribute AMONG the PARTICLES in the system, increasing the size of the system's phase space and hence its entropy.

Discussion

16.	8.The primary of the transformer of a half-wave rectifier is connected to acmains (220V,50 Hz). Its turns ratio is 5: 1. Rectifier is connected to acapacitor-input filter. Calculate de load voltage and the ripple voltage ifthe load resistance is 5 k and the capacitance of the capacitor is 100 uF.
Answer» I don't it's ANSWER OK you can TELL answer ok

16.

8.The primary of the transformer of a half-wave rectifier is connected to acmains (220V,50 Hz). Its turns ratio is 5: 1. Rectifier is connected to acapacitor-input filter. Calculate de load voltage and the ripple voltage ifthe load resistance is 5 k and the capacitance of the capacitor is 100 uF.

Answer»

I don't it's ANSWER OK you can TELL answer ok

Discussion

17.	Prove the Reflection and sufractionbasis oftheorythewave theory
Answer» ANSWER: The incident WAVE FRONT, AB, the reflected wave front A'B' and the reflecting surface AA' are all perpendicular to the plane of the paper. So the incident ray, normal to the reflecting surface and the reflected ray all lie in the same plane. This proves the second LAW of reflection. Explanation: ..tq

17.

Prove the Reflection and sufractionbasis oftheorythewave theory

Answer»

ANSWER:

The incident WAVE FRONT, AB, the reflected wave front A'B' and the reflecting surface AA' are all perpendicular to the plane of the paper. So the incident ray, normal to the reflecting surface and the reflected ray all lie in the same plane. This proves the second LAW of reflection.

Explanation:

..tq

Discussion

18.	Discuss the physical significance of divergence and curl of a vector.
Answer» EXPLANATION: The DIVERGENCE of a VECTOR field is a scalar function. Divergence measures the “outflowing-ness” of a vector field. ... The curl of a vector field is a vector field. The curl of a vector field at point P measures the tendency of PARTICLES at P to rotate about the axis that points in the DIRECTION of the curl at P

18.

Discuss the physical significance of divergence and curl of a vector.

Answer»

EXPLANATION:

The DIVERGENCE of a VECTOR field is a scalar function. Divergence measures the “outflowing-ness” of a vector field. ... The curl of a vector field is a vector field. The curl of a vector field at point P measures the tendency of PARTICLES at P to rotate about the axis that points in the DIRECTION of the curl at P

Discussion

19.	A cone balance on its apex is the example of
Answer» Answer: A CONE BALANCE on its APEX is the EXAMPLE of unstable equilibriu

19.

A cone balance on its apex is the example of

Answer»

Answer:

A CONE BALANCE on its APEX is the EXAMPLE of unstable equilibriu

Discussion

20.	Ii) In case of positive acceleration -a) v = ub) v>uc) v
Answer» b)v>u I'm SORRY if my answer is WRONG

20.

Ii) In case of positive acceleration -a) v = ub) v>uc) v

Answer»

b)v>u

I'm SORRY if my answer is WRONG

Discussion

21.	Which of the following option is incorrect? (Symbols have their usual meaning)U = 1/2 kx2E=1/2 kA2K= 1/2 k(A2-x2)K=1/2(A2-x2)
Answer» ANSWER: U = 1/2 KX2 is INCORRECT ONE

21.

Which of the following option is incorrect? (Symbols have their usual meaning)U = 1/2 kx2E=1/2 kA2K= 1/2 k(A2-x2)K=1/2(A2-x2)

Answer»

ANSWER:

U = 1/2 KX2 is INCORRECT ONE

Discussion

22.	to design an appropriate logic gate combination for a given truth table-and -gate or gate, not gate
Answer» Answer: for two values A and B for or gate it is A+B for and gate it is AxB for not gate it is complement of AxB answer Explanation: A B ANS.(AxB) FOR AND GATE 0 0 0 0 1 0 1 0 0 1 1 1

22.

to design an appropriate logic gate combination for a given truth table-and -gate or gate, not gate

Answer»

Answer:

for two values A and B

for or gate it is A+B

for and gate it is AxB

for not gate it is complement of AxB answer

Explanation:

A B ANS.(AxB)

FOR AND GATE

0 0 0

0 1 0

1 0 0

1 1 1

Discussion

23.	Name the physicals quantity having uint j/t
Answer» ANSWER: MAGNETIC moment is SHOWN by J/TJ/T . It is a scalar QUANTITY

23.

Name the physicals quantity having uint j/t

Answer»

ANSWER:

MAGNETIC moment is SHOWN by J/TJ/T . It is a scalar QUANTITY

Discussion

24.	The angle between the incident ray and the ray reflected from the plain mirror is 70 degrees. The angle of incidence is _______.
Answer» Answer: 55 is the ANGEL of INCIDENT

24.

The angle between the incident ray and the ray reflected from the plain mirror is 70 degrees. The angle of incidence is _______.

Answer»

Answer:

55 is the ANGEL of INCIDENT

Discussion

25.	A football moving on the playground
Answer» EXPLANATION: FORCE of FRICTION will ACT on it.

25.

A football moving on the playground

Answer»

EXPLANATION:

FORCE of FRICTION will ACT on it.

Discussion

26.	4. Two charges 5 µC and 10 µC are placed 1 m apart. What amount of work is done to bring these charges at a distance 0.5 m from each other? (k = 9 x 109 SI)
Answer» Explanation: HOPE it helps you Please MARK me as BRAINLIEST

26.

4. Two charges 5 µC and 10 µC are placed 1 m apart. What amount of work is done to bring these charges at a distance 0.5 m from each other? (k = 9 x 109 SI)

Answer»

Explanation:

HOPE it helps you

Please MARK me as BRAINLIEST

Discussion

27.	05. A force of 10 kg weight acts on body of mass 10 kg. Theacceleration of the object must be:(a) 0 m/s2(c) (1/9.8) m/s2(b) 1 m/s2(d) 9.8 m/s2
Answer» Answer: A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body TRAVELS 50 m in the NEXT 5 s. Find the magnitude of the force.

27.

05. A force of 10 kg weight acts on body of mass 10 kg. Theacceleration of the object must be:(a) 0 m/s2(c) (1/9.8) m/s2(b) 1 m/s2(d) 9.8 m/s2

Answer»

Answer:

A force acts for 10 s on a body of mass 10 kg after which the force ceases and the body TRAVELS 50 m in the NEXT 5 s. Find the magnitude of the force.

Discussion

28.	If the heater works 16 joules in 1 minute what is its power
Answer» EXPLANATION: POWER = ENERGY / Time Here , Energy = 16 joules Time = 1 min = 60 sec Power = 16/60 joules per sec

28.

If the heater works 16 joules in 1 minute what is its power

Answer»

EXPLANATION:

POWER = ENERGY / Time

Here , Energy = 16 joules

Time = 1 min = 60 sec

Power = 16/60 joules per sec

Discussion

29.	An electric train is moving with a velocity of 30m/s. Calculate the distance travelled by the train in 30s
Answer» Answer: 900m Explanation: 30x30

29.

An electric train is moving with a velocity of 30m/s. Calculate the distance travelled by the train in 30s

Answer»

Answer:

900m

Explanation:

30x30

Discussion

30.	What are the properties of the image formed by a concave lens?
Answer» Answer: A *CONCAVE* *lens* *forms* a *virtual* *and* *ERECT* image of *the* *object. The* *IMAGE* is *formed* *BEHIND* *the* *mirror. It gives* *small* *images* of *OBJECTS* *spread* in an *area* in *order* to *see* *all* *objects. It is a diverging* *lens*.

30.

What are the properties of the image formed by a concave lens?

Answer»

Answer:

A CONCAVE lens forms a virtual and ERECT image of the object.

The IMAGE is formed BEHIND the mirror.

It gives small images of OBJECTS spread in an area in order to see all objects.

It is a diverging lens.

Discussion

31.	Words that describe table tennis that start with the letters spelled out as table tennis
Answer» i don't know SORRY . LETTERS of recommendation for the use of the DAY may have been in the future and the rest in the future

31.

Words that describe table tennis that start with the letters spelled out as table tennis

Answer»

i don't know SORRY

. LETTERS of recommendation for the use of the DAY may have been in the future and the rest in the future

Discussion

32.	What is physics ?pls be fast
Answer» $\huge\mathbb\red{❥Answer\:}$ Physics is the NATURAL science that STUDIES matter, its motion and behavior through space and time, and the related entities of ENERGY and force. Physics is ONE of the most fundamental scientific disciplines, and its main GOAL is to understand how the universe behaves.

32.

What is physics ?pls be fast

Answer»

$\huge\mathbb\red{❥Answer\:}$

Physics is the NATURAL science that STUDIES matter, its motion and behavior through space and time, and the related entities of ENERGY and force. Physics is ONE of the most fundamental scientific disciplines, and its main GOAL is to understand how the universe behaves.

Discussion

33.	which of the transistor current is the largest and which is always the smallest. which two current are relatively closed in magnitude.
Answer» ANSWER: The EMITTER current is the largest, the COLLECTOR current is the SMALLEST, and the base and emitter CURRENTS are close.

33.

which of the transistor current is the largest and which is always the smallest. which two current are relatively closed in magnitude.

Answer»

ANSWER:

The EMITTER current is the largest, the COLLECTOR current is the SMALLEST, and the base and emitter CURRENTS are close.

Discussion

34.	If the energy of a photon of sodium light (A, = 580 nm) equals the band gap of semiconductor, then find the minimum energy required to create hole-electron pair.
Answer» Answer: Solar ECLIPSE is ALSO KNOWN as the eclipse of the sun, it occurs when the MOON comes in between the sun and the earth. As a result, the moon BLOCKS the light of the sun from reaching the earth's surface and casts a shadow on it. This occurs on a new moon phase. We can observe up to 5 solar eclipses per year.

34.

If the energy of a photon of sodium light (A, = 580 nm) equals the band gap of semiconductor, then find the minimum energy required to create hole-electron pair.

Answer»

Answer:

Solar ECLIPSE is ALSO KNOWN as the eclipse of the sun, it occurs when the MOON comes in between the sun and the earth. As a result, the moon BLOCKS the light of the sun from reaching the earth's surface and casts a shadow on it. This occurs on a new moon phase. We can observe up to 5 solar eclipses per year.

Discussion

35.	Kiske kiske bffff ho gye kaun kaun aaj celebrate kiya valentiens
Answer» Answer: MERA to HAI hi nhi BFFF jindgi jhand HO gya hai

35.

Kiske kiske bffff ho gye kaun kaun aaj celebrate kiya valentiens

Answer»

Answer:

MERA to HAI hi nhi BFFF jindgi jhand HO gya hai

Discussion

36.	Show that an idel inductor consumes no electric power in an a.c circuit
Answer» ANSWER: Explanation: Loss of power in an inductor is zero because current lags BEHIND the voltage by 90°. In one half CYCLE voltage is positive and in other half cycle of sinusoidal wave current is negative, they will CANCEL out so the power loss will be zero.

36.

Show that an idel inductor consumes no electric power in an a.c circuit

Answer»

ANSWER:

Explanation: Loss of power in an inductor is zero because current lags BEHIND the voltage by 90°. In one half CYCLE voltage is positive and in other half cycle of sinusoidal wave current is negative, they will CANCEL out so the power loss will be zero.

Discussion

37.	The only voltmeter available in a laboratory has a sensitivity of 100 0/V and three scale SoV, 150v, and 300V. When connected in the circuit of figure below, the meter reads 4.65V on its lowest (50V) scale. Calculate the value of Rx and comment on the results.
Answer» PLEASE SEND me the PICTURE of the SUM

37.

The only voltmeter available in a laboratory has a sensitivity of 100 0/V and three scale SoV, 150v, and 300V. When connected in the circuit of figure below, the meter reads 4.65V on its lowest (50V) scale. Calculate the value of Rx and comment on the results.

Answer»

PLEASE SEND me the PICTURE of the SUM

Discussion

38.	Prove that if the vector A and B are parallel to each other than A.B=AB
Answer» Answer: A.B is the dot product of A&B, IMPORTANT THING to NOTE is that dot product is the projection of vector A on B or vice versa. Also the formula of dot product is, \|A.B\| = \|A\| \|B\| cos(theta), where theta is the ANGLE between VECTORS A & B. Using the formula, A.B = AB, for theta = 0 degrees. Explanation:

38.

Prove that if the vector A and B are parallel to each other than A.B=AB

Answer»

Answer:

A.B is the dot product of A&B,

IMPORTANT THING to NOTE is that dot product is the projection of

vector A on B or vice versa.

Also the formula of dot product is,

|A.B| = |A| |B| cos(theta),

where theta is the ANGLE between VECTORS A & B.

Using the formula,

A.B = AB,

for theta = 0 degrees.

Explanation:

Discussion

39.	A metallic object weight 50N in air and 40N in water What is the buoyant force of the water?
Answer» Answer: 10 N is the BUOYANT FORCE of WATER.

39.

A metallic object weight 50N in air and 40N in water What is the buoyant force of the water?

Answer»

Answer:

10 N is the BUOYANT FORCE of WATER.

Discussion

40.	What is meant by ""the specific latent heat of vaporisation of water"" do not give a number
Answer» Answer: Latent heat of vapourisation MEANS when the heat is PROVIDED to an LIQUID and at STAGE of when it change into gas at that point is called Latin heat of vapourisation. Hope it is USEFUL for you.

40.

What is meant by ""the specific latent heat of vaporisation of water"" do not give a number

Answer»

Answer:

Latent heat of vapourisation MEANS when the heat is PROVIDED to an LIQUID and at STAGE of when it change into gas at that point is called Latin heat of vapourisation.

Hope it is USEFUL for you.

Discussion

41.	Political what is the human relations which are transformed by social system
Answer» Explanation: 1) Religion, caste ETC. are influencing SOCIAL system components which maniplulates relationship between two people or religion or caste. 2) The cultural preference also TRANSFORM the HUMAN relationship in different ways . And many more.

41.

Political what is the human relations which are transformed by social system

Answer»

Explanation:

1) Religion, caste ETC. are influencing SOCIAL system components which maniplulates relationship between two people or religion or caste.

2) The cultural preference also TRANSFORM the HUMAN relationship in different ways . And many more.

Discussion

42.	A horizontal force of 1 N is required tomove a metal plate of area 10-2 m² with avelocity of 2 x 10-2 m/s, when it rests ona layer of oil 1.5 x 10-3 m thick. Find thecoefficient of viscosity of oil.[Ans. 7.5 Ns/m]
Answer» ANSWER: PLEASE MARK me BRAINLIEST

42.

A horizontal force of 1 N is required tomove a metal plate of area 10-2 m² with avelocity of 2 x 10-2 m/s, when it rests ona layer of oil 1.5 x 10-3 m thick. Find thecoefficient of viscosity of oil.[Ans. 7.5 Ns/m]

Answer»

ANSWER:

PLEASE MARK me BRAINLIEST

Discussion

43.	11. In the diagram, theray is incident parallelto the principal axis.Redraw the diagram,showing the reflectedray.
Answer» Explanation: if LIGHT is PARALLEL to principle AXIS it REFLECTED through focus of the convex mirror

43.

11. In the diagram, theray is incident parallelto the principal axis.Redraw the diagram,showing the reflectedray.

Answer»

Explanation:

if LIGHT is PARALLEL to principle AXIS it REFLECTED through focus of the convex mirror

Discussion

44.	Class TeSubject-PTime: 1:00 hour1. At 50°C, brass rod has a length 50 cm and adiameter 2 mm. It is joined to a steel rod of thesamelength and diameter at thethe sametemperature. The change in the length of thecomposite rod when it is heated to 250°C is(Coefficient ofof linear expansion of brass=2.0 x10-5 °C- coefficient of linear expansion ofsteel =1.2x10-5 °C-)C
Answer» ANSWER: noooo L don't know Explanation: l am SORRY which CLASS l am 6 class

44.

Class TeSubject-PTime: 1:00 hour1. At 50°C, brass rod has a length 50 cm and adiameter 2 mm. It is joined to a steel rod of thesamelength and diameter at thethe sametemperature. The change in the length of thecomposite rod when it is heated to 250°C is(Coefficient ofof linear expansion of brass=2.0 x10-5 °C- coefficient of linear expansion ofsteel =1.2x10-5 °C-)C

Answer»

ANSWER:

noooo L don't know

Explanation:

l am SORRY which CLASS l am 6 class

Discussion

45.	Are transistor control by current or voltage?
Answer» Answer: plz mark me brainliest EXPLANATION: Basically, a bipolar transistor amplifies a SMALL current entering the base to produce a LARGE collector current. It is a current-driven device SINCE the collector current is controlled VIA the base current. The current gain varies with the collector-emitter voltage (VCE).

45.

Are transistor control by current or voltage?

Answer»

Answer:

plz mark me brainliest

EXPLANATION:

Basically, a bipolar transistor amplifies a SMALL current entering the base to produce a LARGE collector current. It is a current-driven device SINCE the collector current is controlled VIA the base current. The current gain varies with the collector-emitter voltage (VCE).

Discussion

46.	1.The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. What will be the direction of induced current in the conducting plane?
Answer» The north POLE of a long horizontal bar magnet is being brought CLOSER to a VERTICAL conducting plane ALONG the perpendicular direction. ... By using the Fleming's right hand rule, the direction of induced current will be CLOCKWISE.

46.

1.The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. What will be the direction of induced current in the conducting plane?

Answer»

The north POLE of a long horizontal bar magnet is being brought CLOSER to a VERTICAL conducting plane ALONG the perpendicular direction. ... By using the Fleming's right hand rule, the direction of induced current will be CLOCKWISE.

Discussion

47.	What happens when KMnO4 is heated?
Answer» Answer: Thermal decomposition Thermal decompositionSolid POTASSIUM permanganate decomposes when HEATED: 2 KMnO4 → K2MnO4 + MnO2(s) + O. Here, the oxidation state of MANGANESE changes as the potassium permanganate (oxidation state +7) decomposes to potassium manganate (oxidation state +6) and manganese dioxide (oxidation state +4). Explanation: HoPe It HELP'S UhH ☺ ☹SaD BlAcK DaY FoR InDiA ('° ---- °') ☹ ¹⁴ FÈB ²⁰¹⁹ PLS FLW ME PLS ☹PLS THANKS =THANKS ☺ जय महाकाल ✌ITZ AbUsiNg QuEeN✌

47.

What happens when KMnO4 is heated?

Answer»

Answer:

Thermal decomposition

Thermal decompositionSolid POTASSIUM permanganate decomposes when HEATED: 2 KMnO4 → K2MnO4 + MnO2(s) + O. Here, the oxidation state of MANGANESE changes as the potassium permanganate (oxidation state +7) decomposes to potassium manganate (oxidation state +6) and manganese dioxide (oxidation state +4).

Explanation:

HoPe It HELP'S UhH ☺

☹SaD BlAcK DaY FoR InDiA ('° ---- °') ☹

¹⁴ FÈB ²⁰¹⁹

PLS FLW ME PLS ☹PLS

THANKS =THANKS ☺

जय महाकाल

✌ITZ AbUsiNg QuEeN✌

Discussion

48.	What is the angle between two forces F1=2N and F2=3N having resultant as 4N
Answer» GIVEN : Resultant of two forces = 4N F₁ = 2N F₂ = 3N To find : The angle between two forces. Solution : USING law of cosine that is, If two VECTORS A and B of magnitudes A and B are acting at an angle θ, then the MAGNITUDE of their resultant using parallelogram METHOD of vector addition is, $\boxed{ \sf R = \sqrt{ A^2 + B^2 + 2ABcos \theta}}$ By substituting the values, $\dashrightarrow\sf R = \sqrt{ F_1^{2} + F_2 ^{2} + 2ABcos \theta}$ $\dashrightarrow\sf 4 = \sqrt{2^{2} + 3 ^{2} + 2(2)(3)cos \theta}$ $\dashrightarrow\sf 16 = 4 + 9 + 12cos \theta$ $\dashrightarrow\sf 16 = 13 + 12cos \theta$ $\dashrightarrow\sf 16 - 13 = 12cos \theta$ $\dashrightarrow\sf 12cos \theta = 3$ $\dashrightarrow\sf cos \theta = \dfrac{3}{12}$ $\dashrightarrow\sf cos \theta = \dfrac{1}{4}$ $\dashrightarrow\sf \theta = 75 \degree32'$ Thus, the angle between two forces is 75° 32'

48.

What is the angle between two forces F1=2N and F2=3N having resultant as 4N

Answer»

GIVEN :

Resultant of two forces = 4N

F₁ = 2N

F₂ = 3N

To find :

The angle between two forces.

Solution :

USING law of cosine that is,

If two VECTORS A and B of magnitudes A and B are acting at an angle θ, then the MAGNITUDE of their resultant using parallelogram METHOD of vector addition is,

$\boxed{ \sf R = \sqrt{ A^2 + B^2 + 2ABcos \theta}}$

By substituting the values,

$\dashrightarrow\sf R = \sqrt{ F_1^{2} + F_2 ^{2} + 2ABcos \theta}$

$\dashrightarrow\sf 4 = \sqrt{2^{2} + 3 ^{2} + 2(2)(3)cos \theta}$

$\dashrightarrow\sf 16 = 4 + 9 + 12cos \theta$

$\dashrightarrow\sf 16 = 13 + 12cos \theta$

$\dashrightarrow\sf 16 - 13 = 12cos \theta$

$\dashrightarrow\sf 12cos \theta = 3$

$\dashrightarrow\sf cos \theta = \dfrac{3}{12}$

$\dashrightarrow\sf cos \theta = \dfrac{1}{4}$

$\dashrightarrow\sf \theta = 75 \degree32'$

Thus, the angle between two forces is 75° 32'

Discussion

49.	What is the angle between two forces if 1=2N and if 2=3 and having resultant as 4N
Answer»

Discussion

50.	What is myopia ?pls be fast
Answer» A condition in which CLOSE objects appear CLEARLY, but FAR ones don't. Near-sightedness TENDS to run in families. $\pink{ItzLioness}$

50.

What is myopia ?pls be fast

Answer»

A condition in which CLOSE objects appear CLEARLY, but FAR ones don't.

Near-sightedness TENDS to run in families.

$\pink{ItzLioness}$

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¹⁴ FÈB ²⁰¹⁹

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