67486 + Interview Questions in Secondary School in Physics

1.	Give scientific reason the clock gets potential energy when its spring is wound
Answer» Answer: When the SPRING of the clock is wound the work done on the spring by winding it gets stored in it as a POTENTIAL ENERGY (PE). This Potential Energy can be utilised by the clock mechanism to operate. If the spring constant is k then by winding it for length X, the potential energy stored in the spring will be $\frac{1}{2}kx^2$ HOPE this answer is helpful.

1.

Give scientific reason the clock gets potential energy when its spring is wound

Answer»

Answer:

When the SPRING of the clock is wound the work done on the spring by winding it gets stored in it as a POTENTIAL ENERGY (PE). This Potential Energy can be utilised by the clock mechanism to operate.

If the spring constant is k then by winding it for length X, the potential energy stored in the spring will be $\frac{1}{2}kx^2$

HOPE this answer is helpful.

Discussion

2.	Bacterial cell may be molatile and non molatile explain
Answer» Answer: Motile and non-motile bacteria can be differentiated along the stab lines. Motile bacteria will grow out from the stab line while non-motile bacteria are present only along the stab line. Non-motile bacteria are those bacterial species that lack the ability and structures that would allow them to propel themselves, under their own power, through their environment. When non-motile bacteria are cultured in a stab tube, they only grow along the stab line. If the bacteria are mobile, the line will APPEAR diffuse and extend into the medium.[1] The cell structures that provide the ability for locomotion are the cilia and flagella. Coliform and Streptococci are examples of non-motile bacteria as are Klebsiella pneumoniae, and Yersinia pestis. Motility is one characteristic used in the identification of bacteria and evidence of possessing structures: peritrichous flagella, polar flagella and/or a combination of both.[2][3] Though the lack of motility might be regarded a disadvantage, some non-motile bacteria POSSESS structures that allow their attachment to eukaryotic cells, like GI mucousal cells.[4] Vancomycin resistant Enterococcus spp. are non-motile while vancomycin susceptible Enterococcus spp. Some genera have been divided based upon the presence or absence of motility. Motility is determined by using a motility medium. The ingredients include motility test medium, nutrient broth powder, NaCl and distilled water. An inoculating needle (not a loop) is used to insert the bacterial sample. The needle is inserted through the medium for a length of one inch. The media tube incubated at 38 °C (100 °F). Bacteria that are motile grow away from the stab, and toward the sides and downward toward the bottom of the tube. Growth should be observed in 24 to 48 HOURS. With some species, the bacterium is inconsistent related to its motility.[5] while Motility is the ability of an organism to move independently, using metabolic energy.[3][4] This is in contrast to mobility, which describes the ability of an object to be MOVED. Motility is genetically determined,[5] but may be affected by environmental factors. For instance, muscles give animals motility but the consumption of hydrogen cyanide (the environmental factor in this case) would adversely affect muscle physiology, causing them to stiffen, leading to RIGOR mortis.[6][7][8] In addition to animal locomotion, most animals are motile (some move by passive locomotion). The term applies to bacteria and other microorganisms, and to some multicellular organisms, as well as to some mechanisms of fluid flow in multicellular organs and tissue. Motile marine animals are commonly called free-swimming,[9][10][11] and motile non-parasitic organisms are called free-living.[citation needed] Motility also refers to an organism's ability to move food through its digestive tract. There are two types of intestinal motility – peristalsis and segmentation.[12] This motility is brought about by the contraction of smooth muscles in the gastrointestinal tract which mix the luminal contents with various secretions (segmentation) and move contents through the digestive tract from the mouth to the anus (peristalsis).[13]

2.

Bacterial cell may be molatile and non molatile explain

Answer»

Answer:

Motile and non-motile bacteria can be differentiated along the stab lines. Motile bacteria will grow out from the stab line while non-motile bacteria are present only along the stab line.

Non-motile bacteria are those bacterial species that lack the ability and structures that would allow them to propel themselves, under their own power, through their environment. When non-motile bacteria are cultured in a stab tube, they only grow along the stab line. If the bacteria are mobile, the line will APPEAR diffuse and extend into the medium.[1] The cell structures that provide the ability for locomotion are the cilia and flagella. Coliform and Streptococci are examples of non-motile bacteria as are Klebsiella pneumoniae, and Yersinia pestis. Motility is one characteristic used in the identification of bacteria and evidence of possessing structures: peritrichous flagella, polar flagella and/or a combination of both.[2][3]

Though the lack of motility might be regarded a disadvantage, some non-motile bacteria POSSESS structures that allow their attachment to eukaryotic cells, like GI mucousal cells.[4]

Vancomycin resistant Enterococcus spp. are non-motile while vancomycin susceptible Enterococcus spp. Some genera have been divided based upon the presence or absence of motility. Motility is determined by using a motility medium. The ingredients include motility test medium, nutrient broth powder, NaCl and distilled water. An inoculating needle (not a loop) is used to insert the bacterial sample. The needle is inserted through the medium for a length of one inch. The media tube incubated at 38 °C (100 °F). Bacteria that are motile grow away from the stab, and toward the sides and downward toward the bottom of the tube. Growth should be observed in 24 to 48 HOURS. With some species, the bacterium is inconsistent related to its motility.[5]

while

Motility is the ability of an organism to move independently, using metabolic energy.[3][4] This is in contrast to mobility, which describes the ability of an object to be MOVED. Motility is genetically determined,[5] but may be affected by environmental factors. For instance, muscles give animals motility but the consumption of hydrogen cyanide (the environmental factor in this case) would adversely affect muscle physiology, causing them to stiffen, leading to RIGOR mortis.[6][7][8] In addition to animal locomotion, most animals are motile (some move by passive locomotion). The term applies to bacteria and other microorganisms, and to some multicellular organisms, as well as to some mechanisms of fluid flow in multicellular organs and tissue. Motile marine animals are commonly called free-swimming,[9][10][11] and motile non-parasitic organisms are called free-living.[citation needed]

Motility also refers to an organism's ability to move food through its digestive tract. There are two types of intestinal motility – peristalsis and segmentation.[12] This motility is brought about by the contraction of smooth muscles in the gastrointestinal tract which mix the luminal contents with various secretions (segmentation) and move contents through the digestive tract from the mouth to the anus (peristalsis).[13]

Discussion

3.	What are the magnetic field line? How is the direction of magnetic field at point in a magnetic field determineed using field line ?
Answer» Explanation: The magnetic field can be defined as: “A REGION around/surrounded by a moving electric charge or a magnetic material within which the force of magnetism acts.” How does Magnetic Field occur? If you are wondering how Magnetic fields occur. Well, it occurs whenever a charge is in motion. That being SAID if you apply more charge in the motion the strength of a magnetic field usually increases. Besides, Magnetism and magnetic fields are part of the electromagnetic force which is indeed ONE of the FOUR PRIME forces of nature.

3.

What are the magnetic field line? How is the direction of magnetic field at point in a magnetic field determineed using field line ?

Answer»

Explanation:

The magnetic field can be defined as:

“A REGION around/surrounded by a moving electric charge or a magnetic material within which the force of magnetism acts.”

How does Magnetic Field occur?

If you are wondering how Magnetic fields occur. Well, it occurs whenever a charge is in motion. That being SAID if you apply more charge in the motion the strength of a magnetic field usually increases. Besides, Magnetism and magnetic fields are part of the electromagnetic force which is indeed ONE of the FOUR PRIME forces of nature.

Discussion

4.	Which ionic compound are conductor of electricity ?
Answer» Answer: Explanation:Ionic compounds in SOLID state are non-CONDUCTORS of electricity.Ionic compounds in MOLTEN aq. solution state are GOOD conductors of electricity as electrostatic force almost disappears hence free ions are formed.

4.

Which ionic compound are conductor of electricity ?

Answer»

Answer:

Explanation:Ionic compounds in SOLID state are non-CONDUCTORS of electricity.Ionic compounds in MOLTEN aq. solution state are GOOD conductors of electricity as electrostatic force almost disappears hence free ions are formed.

Discussion

5.	Can we use car rear view mirror made of concave surface. Why or why not
Answer» Answer:REAR view mirrors have a convex surface Explanation:It diverges light providing a wider FIELD of view.

5.

Can we use car rear view mirror made of concave surface. Why or why not

Answer»

Answer:REAR view mirrors have a convex surface

Explanation:It diverges light providing a wider FIELD of view.

Discussion

6.	Heya dears ❤️ what is pollination and its two types??
Answer» Answer: Pollination is the act of transferring pollen grains from the MALE anther of a flower to the female stigma. The goal of every LIVING organism, including plants, is to CREATE offspring for the next GENERATION. One of the ways that plants can produce offspring is by MAKING seeds. There are two types of pollination, called self-pollination and cross-pollination. Self-pollination is the more basic type of pollination because it only involves one flower. This type of pollination occurs when pollen grains from the anther fall directly onto the stigma of the same flower. Explanation: I hope it helps you dear ❗ please mark as brainliest answer

6.

Heya dears ❤️ what is pollination and its two types??

Answer»

Answer:

Pollination is the act of transferring pollen grains from the MALE anther of a flower to the female stigma. The goal of every LIVING organism, including plants, is to CREATE offspring for the next GENERATION. One of the ways that plants can produce offspring is by MAKING seeds.

There are two types of pollination, called self-pollination and cross-pollination. Self-pollination is the more basic type of pollination because it only involves one flower. This type of pollination occurs when pollen grains from the anther fall directly onto the stigma of the same flower.

Explanation:

I hope it helps you dear ❗

please mark as brainliest answer

Discussion

7.	a particle is moving in a circle of radius R with constant speed.The time period of particle is T=1 second.In a time t=T/6,if the difference between average speed and magnitude of average velocity of particle is 2 m/sec,find the radius of circle
Answer» Answer: let the angular speed of the particle be 'W' 1 rev in ONE second = 2πrad/s angular speed v = WR = 2πR m/s t = T/6 = 1/6 average speed = TOTAL distance / time = angleR /(1/6) in T/6 angle swept is 2π/6 = π/3 (60°) Avg speed = (π/3)R/(1/6) = 2πR m/s(same as angular speed)* Avg velocity = displacement/ time in T/6 time the particle will make 60° at the centre of the circle. if you draw a triangle with initial, fianl POINTS and the centre you'll see the displacement is R. Avg velocity = R/(1/6) = 6R m/s Given, Avg speed - Avg velocity = 2m/s 2πR - 6R = 2 6.282R - 6R = 2 0.282R = 2 R = 2/0.282 = 7.1m

7.

a particle is moving in a circle of radius R with constant speed.The time period of particle is T=1 second.In a time t=T/6,if the difference between average speed and magnitude of average velocity of particle is 2 m/sec,find the radius of circle

Answer»

Answer:

let the angular speed of the particle be 'W'

1 rev in ONE second = 2πrad/s

angular speed v = WR = 2πR m/s

t = T/6 = 1/6

average speed = TOTAL distance / time = angle*R /(1/6)

in T/6 angle swept is 2π/6 = π/3 (60°)

Avg speed = (π/3)R/(1/6) = 2πR m/s(same as angular speed)

Avg velocity = displacement/ time

in T/6 time the particle will make 60° at the centre of the circle. if you draw a triangle with initial, fianl POINTS and the centre you'll see the displacement is R.

Avg velocity = R/(1/6) = 6R m/s

Given,

Avg speed - Avg velocity = 2m/s

2πR - 6R = 2

6.282R - 6R = 2

0.282R = 2

R = 2/0.282 = 7.1m

Discussion

8.	Why does the sound from a glass kept before water tank become shriller?
Answer» ANSWER: The sound GRADUALLY gets QUITTER and dies out as the amplitude of the vibrations diminishes due to energy being carried away by the sound waves. ... If you can match the pitch of your voice to the RESONANT FREQUENCY of the glass the vibrating air will start the glass vibrating too.

8.

Why does the sound from a glass kept before water tank become shriller?

Answer»

ANSWER:

The sound GRADUALLY gets QUITTER and dies out as the amplitude of the vibrations diminishes due to energy being carried away by the sound waves. ... If you can match the pitch of your voice to the RESONANT FREQUENCY of the glass the vibrating air will start the glass vibrating too.

Discussion

9.	Hello! What is pollination? Plz define its types also
Answer» $\huge\underline\mathfrak\pink{<klux>POLLINATION</klux>}$ → The transfer of POLLEN grains from the anther to the stigma is CALLED pollination. It is of two types : SELF pollination : The transfer POEM grains from the anther of flower to the stigma of same flower or of another flower born on same plant is called self pollination. Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination. __________________________!! ❤️"

9.

Hello! What is pollination? Plz define its types also

Answer»

$\huge\underline\mathfrak\pink{<klux>POLLINATION</klux>}$

→ The transfer of POLLEN grains from the anther to the stigma is CALLED pollination.

It is of two types :

SELF pollination : The transfer POEM grains from the anther of flower to the stigma of same flower or of another flower born on same plant is called self pollination.

Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination.

__________________________!! ❤️"

Discussion

10.	if the resistance of a wire is R and it is stretched to tripal its length then find the new resistance of the wire
Answer» ANSWER: GJB bhai mere PASS it on my GVS

10.

if the resistance of a wire is R and it is stretched to tripal its length then find the new resistance of the wire

Answer»

ANSWER:

GJB bhai mere PASS it on my GVS

Discussion

11.	Water is generally uses to put out fire.explain why?
Answer» Answer: "When you PUT water on a fire it does two THINGS. It displaces the free oxygen molecules (which have two atoms of oxygen) so that it is not available to PARTICIPATE in the burning process AND it turns to steam, carrying heat away from the fire, cooling it to the POINT where it can no LONGER burn." mark as brainliest

11.

Water is generally uses to put out fire.explain why?

Answer»

Answer:

"When you PUT water on a fire it does two THINGS. It displaces the free oxygen molecules (which have two atoms of oxygen) so that it is not available to PARTICIPATE in the burning process AND it turns to steam, carrying heat away from the fire, cooling it to the POINT where it can no LONGER burn."

mark as brainliest

Discussion

12.	Relative density units
Answer» ANSWER: RELATIVE DENSITY has no UNITS ......MATE

12.

Relative density units

Answer»

ANSWER:

RELATIVE DENSITY has no UNITS ......MATE

Discussion

13.	33 What results from the destruction of cilia in the trachea due to smoking?A Cilia cannot filter bacteria.B Cilia cannot trap dust.C Mucus cannot be manufactured.D Mucus cannot be carried towards the throat.
Answer» Answer: D) Mucus cannot be carried TOWARDS the throat Explanation: TRAPPING dust and microorganisms LIKE bacteria is the function of nasal HAIRS and mucus. Mucus is manufactured glandular epithelium in the respiratory tract (goblet CELLS). The function of cilia is to transport mucus out of the respiratory tract.

13.

33 What results from the destruction of cilia in the trachea due to smoking?A Cilia cannot filter bacteria.B Cilia cannot trap dust.C Mucus cannot be manufactured.D Mucus cannot be carried towards the throat.

Answer»

Answer:

D) Mucus cannot be carried TOWARDS the throat

Explanation:

TRAPPING dust and microorganisms LIKE bacteria is the function of nasal HAIRS and mucus.

Mucus is manufactured glandular epithelium in the respiratory tract (goblet CELLS).

The function of cilia is to transport mucus out of the respiratory tract.

Discussion

14.	A force of 10 newton accelerates on an obhect from 50 m/s to 25m/s in 20 seconds calculate the force
Answer» ANSWER: 4 Explanation: F =ma 10=m × -2.5 m=4 so that the answer is 4KG

14.

A force of 10 newton accelerates on an obhect from 50 m/s to 25m/s in 20 seconds calculate the force

Answer»

ANSWER:

4

Explanation:

F =ma

10=m × -2.5

m=4

so that the answer is 4KG

Discussion

15.	A device that provides a central connection point for cables is
Answer» ANSWER: pulley Explanation:

15.

A device that provides a central connection point for cables is

Answer»

ANSWER:

pulley

Explanation:

Discussion

16.	the displacement of a body is given by 4 S is equal to M + 2Nt^4 where m and n are constants. Find the velocity of the body at any instant.
Answer» Answer:2Nt³ Explanation:by DIFFERENTIATING the POSITION function with respect to TIME will give us VELOCITY function

16.

the displacement of a body is given by 4 S is equal to M + 2Nt^4 where m and n are constants. Find the velocity of the body at any instant.

Answer»

Answer:2Nt³

Explanation:by DIFFERENTIATING the POSITION function with respect to TIME will give us VELOCITY function

Discussion

17.	Why we use to prefer mercury in thermkmeter? Give five reasons
Answer» Answer: • It is a COLOURED liquid metal. • It has HIGH BOILING point. • It has high coefficient of expansion. • It is NON sticky. • It will not expand when it get solidifies and hence doesn't BREAK the glass.

17.

Why we use to prefer mercury in thermkmeter? Give five reasons

Answer»

Answer:

• It is a COLOURED liquid metal.

• It has HIGH BOILING point.

• It has high coefficient of expansion.

• It is NON sticky.

• It will not expand when it get solidifies and hence doesn't BREAK the glass.

Discussion

18.	As transparent mayerial does not reflect light then how we see them
Answer» Answer: first of all U CANT see transparent objects u see through them Explanation: everyday materials that we call transparent are not a 100% transparent.when u LOOK around the curves and edges you will notice some degree of reflection and that's what HELPS us to view the outline of the OBJECT and not the object itself

18.

As transparent mayerial does not reflect light then how we see them

Answer»

Answer:

first of all U CANT see transparent objects u see through them

Explanation:

everyday materials that we call transparent are not a 100% transparent.when u LOOK around the curves and edges you will notice some degree of reflection and that's what HELPS us to view the outline of the OBJECT and not the object itself

Discussion

19.	Aqueous solution in base is a good conductor of electricity
Answer» Explanation: I hope it's HELPFUL for you PLZ MARK as brainlist

19.

Aqueous solution in base is a good conductor of electricity

Answer»

Explanation:

I hope it's HELPFUL for you PLZ MARK as brainlist

Discussion

20.	A particle is projected with velocity 10m/s at an angle of 60 from ground
Answer» EXPLANATION: It is SAID to be at DISTANCE of 60®

20.

A particle is projected with velocity 10m/s at an angle of 60 from ground

Answer»

EXPLANATION:

It is SAID to be at DISTANCE of 60®

Discussion

21.	A particle is moving in a circle of radius r is equal to 3 metres with an angular speed to radian per second
Answer» EXPLANATION: hi good NIGHT out with a few MINUTES to any other way around the world

21.

A particle is moving in a circle of radius r is equal to 3 metres with an angular speed to radian per second

Answer»

EXPLANATION:

hi good NIGHT out with a few MINUTES to any other way around the world

Discussion

22.	Pollination and two types? Define.....
Answer» $\huge\underline\mathfrak\pink{Pollination}$ → The transfer of POLLEN grains from the anther to the STIGMA is CALLED pollination. It is of two types : Self pollination : The transfer poem grains from the anther of FLOWER to the stigma of same flower or of ANOTHER flower born on same plant is called self pollination. Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination. __________________________!! ❤️

22.

Pollination and two types? Define.....

Answer»

$\huge\underline\mathfrak\pink{Pollination}$

→ The transfer of POLLEN grains from the anther to the STIGMA is CALLED pollination.

It is of two types :

Self pollination : The transfer poem grains from the anther of FLOWER to the stigma of same flower or of ANOTHER flower born on same plant is called self pollination.

Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination.

__________________________!! ❤️

Discussion

23.	18.14. In the figure given below, with what acceleladoes the block of mass m will move? (Pulley andstrings are massless and frictionless
Answer» ANSWER:a=g/3 Explanation: By Drawing FBD of all THREE block and resolving Tension Forces we GET 3 eq of forces we can find acc

23.

18.14. In the figure given below, with what acceleladoes the block of mass m will move? (Pulley andstrings are massless and frictionless

Answer»

ANSWER:a=g/3

Explanation:

By Drawing FBD of all THREE block and resolving Tension Forces we GET 3 eq of forces we can find acc

Discussion

24.	a Bob of a conical pendulum undergoes option A rectilinear motion in a horizontal plane option B uniform motion in a horizontal circle option C uniforms motion in the vertical circle option d rectilinear motion in a vertical circle
Answer» Answer: OPTION B : Uniform motion in a horizontal circle Explanation: Conical pendulum is just like a SIMPLE pendulum. The difference is that the bob of a simple pendulum swings back and forth while the bob of a conical pendulum moves with a constant speed in a circle. The string attached to the bob traces a cone. Therefore, the CORRECT option will be option B I hope this answer helps you.

24.

a Bob of a conical pendulum undergoes option A rectilinear motion in a horizontal plane option B uniform motion in a horizontal circle option C uniforms motion in the vertical circle option d rectilinear motion in a vertical circle

Answer»

Answer:

OPTION B : Uniform motion in a horizontal circle

Explanation:

Conical pendulum is just like a SIMPLE pendulum. The difference is that the bob of a simple pendulum swings back and forth while the bob of a conical pendulum moves with a constant speed in a circle. The string attached to the bob traces a cone.

Therefore, the CORRECT option will be option B

I hope this answer helps you.

Discussion

25.	What is different Low of inertia?Explain Briefly...?
Answer» answer:- *law* of *inertia* *states* *that* *every* *body* *continues* *its* *state* of *REST* or in *uniform* *MOTION* *until* *some* *EXTERNAL* *force* or *unbalanced force* *change* it.. *BTW* *advance* me *happy* *BIRTHDAY*...!!:)

25.

What is different Low of inertia?Explain Briefly...?

Answer»

answer:-

law of inertia states that every body continues its state of REST or in uniform MOTION until some EXTERNAL force or unbalanced force change it..

BTW advance me happy BIRTHDAY...!!:)

Discussion

26.	A heat engine operates between two attemperatures of 25°C and 300°C. What is the maximumelliciency for this engine?
Answer» ANSWER: A heat ENGINE OPERATES between two RESERVOIRS at temperature of 25°centigrade.

26.

A heat engine operates between two attemperatures of 25°C and 300°C. What is the maximumelliciency for this engine?

Answer»

ANSWER:

A heat ENGINE OPERATES between two RESERVOIRS at temperature of 25°centigrade.

Discussion

27.	Plz answer it answer is 5A but i dont know how it came
Answer» Answer: first SOLVE parallel connections then SERIES and U got u R answer 5/2+5/2+5+5 Explanation:

27.

Plz answer it answer is 5A but i dont know how it came

Answer»

Answer:

first SOLVE parallel connections then SERIES and U got u R answer

5/2+5/2+5+5

Explanation:

Discussion

28.	In a cricket match, why does a player lower his hands slightly while catching the ball?
Answer» Answer: *heya* *DEAR..!!!! here* is ur *answer.... cricket player lower his hand while catching a cricket BALL because decrease the rate of change of momentum by increase the time so , the ball will EXERT lesser force on the hands of the filder , and the filder will not get hurt . #KEEP* *ASKING*

28.

In a cricket match, why does a player lower his hands slightly while catching the ball?

Answer»

Answer:

heya DEAR..!!!!

here is ur answer....

cricket player lower his hand while catching a cricket BALL because decrease the rate of change of momentum by increase the time so , the ball will EXERT lesser force on the hands of the filder , and the filder will not get hurt .

#KEEP ASKING

Discussion

29.	Difference between staic friction and frictional force
Answer» STATIC friction is a type of frictional force which is experienced by an object when it BEGINS to move frictional force is of 2 types static friction and KINETIC friction it experienced when the object is both at REST and moving

29.

Difference between staic friction and frictional force

Answer»

STATIC friction is a type of frictional force which is experienced by an object when it BEGINS to move

frictional force is of 2 types static friction and KINETIC friction it experienced when the object is both at REST and moving

Discussion

30.	A ball is moving on a perfectly smooth horizontalsurface. If no force is applied on it, will its speeddecrease, increase or remain unchanged ?
Answer» ANSWER: If a ball is moving on a PERFECTLY smooth surface HORIZONTALLY and no frictional force is present between the ball and the surface , the speed will REMAIN unchanged. The ball will have no reason to change its speed if no force is applied. hope it helped and please mark as BRAINLIEST:)

30.

A ball is moving on a perfectly smooth horizontalsurface. If no force is applied on it, will its speeddecrease, increase or remain unchanged ?

Answer»

ANSWER:

If a ball is moving on a PERFECTLY smooth surface HORIZONTALLY and no frictional force is present between the ball and the surface , the speed will REMAIN unchanged. The ball will have no reason to change its speed if no force is applied.

hope it helped and please mark as BRAINLIEST:)

Discussion

31.	One person goes from A to B with average speed of x km / hour and returns from B to A, with an average speed of y km / hour. What is his average speed in the whole trip.?
Answer» ANSWER: AVERAGE SPEED would be (x+y)/2 kmph because distance covered at both speeds was same.

31.

One person goes from A to B with average speed of x km / hour and returns from B to A, with an average speed of y km / hour. What is his average speed in the whole trip.?

Answer»

ANSWER:

AVERAGE SPEED would be

(x+y)/2 kmph

because distance covered at both speeds was same.

Discussion

32.	Hey brainliacs ❤️ What is pollination? N self and cross pollination?? ❤️
Answer» $\huge\underline\mathfrak\pink{Pollination}$ → The transfer of pollen GRAINS from the anther to the stigma is called pollination. It is of two TYPES : Self pollination : The transfer poem grains from the anther of flower to the stigma of same flower or of another flower born on same PLANT is called self pollination. CROSS pollination : The transfer of pollen grains from ONE plant to the stigma of flower of another plant is called cross pollination. __________________________!! ❤️

32.

Hey brainliacs ❤️ What is pollination? N self and cross pollination?? ❤️

Answer»

$\huge\underline\mathfrak\pink{Pollination}$

→ The transfer of pollen GRAINS from the anther to the stigma is called pollination.

It is of two TYPES :

Self pollination : The transfer poem grains from the anther of flower to the stigma of same flower or of another flower born on same PLANT is called self pollination.

CROSS pollination : The transfer of pollen grains from ONE plant to the stigma of flower of another plant is called cross pollination.

__________________________!! ❤️

Discussion

33.	What is a longitudinal wave
Answer» Answer: A longitudinal wave is a wave in which the PARTICLE movement is parallel to the direction of the wave propagation. This means that the particles MOVE left and RIGHT which in turn makes the other particles START to oscillate. ... Longitudinal waves are also called pressure waves, and sound waves are the most COMMON kinds. Explanation: mark as brainliest

33.

What is a longitudinal wave

Answer»

Answer:

A longitudinal wave is a wave in which the PARTICLE movement is parallel to the direction of the wave propagation. This means that the particles MOVE left and RIGHT which in turn makes the other particles START to oscillate. ... Longitudinal waves are also called pressure waves, and sound waves are the most COMMON kinds.

Explanation:

mark as brainliest

Discussion

34.	A force of 10n act on a particle of mass 0.4kg .Acceleration
Answer» Answer: EXPLANATION: F = 10 N m = 0.4 kg F = ma a = F/m therefore, a = 10/0.4 a = 100/4 = 25 m/s^2

34.

A force of 10n act on a particle of mass 0.4kg .Acceleration

Answer»

Answer:

EXPLANATION:

F = 10 N

m = 0.4 kg

F = ma

a = F/m

therefore, a = 10/0.4

a = 100/4 = 25 m/s^2

Discussion

35.	A bus is moving with a velocity of 5m/s towards a huge wall
Answer» Answer: what we NEED TELL here Explanation: i THINK this is incomplete question

35.

A bus is moving with a velocity of 5m/s towards a huge wall

Answer»

Answer:

what we NEED TELL here

Explanation:

i THINK this is incomplete question

Discussion

36.	A block of mass m is placed on a smooth inclined wedge abc
Answer» Not UNDERSTANDING PLZ

Discussion

37.	A ball is thrown vertically upwards with a velocity of 25 ms from the top of a tower ol height 30 m. How long will it travel before it hits ground 6s (2) 5
Answer» Answer: t = 3 sec Explanation: Given ; Initial VELOCITY ( u ) = 25 m / sec Height ( h ) = 30 m Final velocity will be 0 m / sec we have to find time ( t ) From second equation of MOTION we have h = u t - 1 / 2 g t² [ ACCELERATION against gravity ] putting values [ Here displacement will be in negative ] - 30 = 25 t - 1 / 2 × 10 × t² [ Taken g = 10 ] - 30 = 25 t - 5 t² - 6 = 5 t - t² t² - 5 t - 6 = 0 ( t - 3 ) ( t + 2 ) = 0 t = 3 sec or t = - 2 sec . Time can't in negative ; Thus we get time t = 3 sec .

37.

A ball is thrown vertically upwards with a velocity of 25 ms from the top of a tower ol height 30 m. How long will it travel before it hits ground 6s (2) 5

Answer»

Answer:

t = 3 sec

Explanation:

Given ;

Initial VELOCITY ( u ) = 25 m / sec

Height ( h ) = 30 m

Final velocity will be 0 m / sec

we have to find time ( t )

From second equation of MOTION we have

h = u t - 1 / 2 g t² [ ACCELERATION against gravity ]

putting values

[ Here displacement will be in negative ]

- 30 = 25 t - 1 / 2 × 10 × t² [ Taken g = 10 ]

- 30 = 25 t - 5 t²

- 6 = 5 t - t²

t² - 5 t - 6 = 0

( t - 3 ) ( t + 2 ) = 0

t = 3 sec or t = - 2 sec .

Time can't in negative ;

Thus we get time t = 3 sec .

Discussion

38.	A ball is projected vertically upwards from a tower of height 20m at speed of 5m/s
Answer» ANSWER: v² = u²+2aS v² = 5×5 + 2×10×20 v² =25+400 v = √425 = 20.61 m/s

38.

A ball is projected vertically upwards from a tower of height 20m at speed of 5m/s

Answer»

ANSWER:

v² = u²+2aS

v² = 5×5 + 2×10×20

v² =25+400

v = √425

= 20.61 m/s

Discussion

39.	Why doesn't a bullet deviate from its straight line path
Answer» ANSWER: because of HIGH SPEED................

39.

Why doesn't a bullet deviate from its straight line path

Answer»

ANSWER:

because of HIGH SPEED................

Discussion

40.	What is meant by the term inertia?
Answer» ANSWER: the PHYSICAL FORCE that keeps THINGS where they are or keeps them moving in the direction they are travelling...

40.

What is meant by the term inertia?

Answer»

ANSWER:

the PHYSICAL FORCE that keeps THINGS where they are or keeps them moving in the direction they are travelling...

Discussion

41.	Hello There! What is pollination and types???????
Answer» $\huge\underline\mathfrak\pink{Pollination}$ → The transfer of pollen GRAINS from the anther to the STIGMA is CALLED pollination. It is of two types : SELF pollination : The transfer poem grains from the anther of flower to the stigma of same flower or of another flower born on same PLANT is called self pollination. Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination. __________________________!! ❤️"

41.

Hello There! What is pollination and types???????

Answer»

$\huge\underline\mathfrak\pink{Pollination}$

→ The transfer of pollen GRAINS from the anther to the STIGMA is CALLED pollination.

It is of two types :

SELF pollination : The transfer poem grains from the anther of flower to the stigma of same flower or of another flower born on same PLANT is called self pollination.

Cross pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination.

__________________________!! ❤️"

Discussion

42.	Resultant of two orthogonal force perpendicular force is 25 magnitueto of forces is
Answer» Answer:25.2½ Explanation:it can be SOLVED by LAW of VECTOR ADDITION

42.

Resultant of two orthogonal force perpendicular force is 25 magnitueto of forces is

Answer»

Answer:25.2½

Explanation:it can be SOLVED by LAW of VECTOR ADDITION

Discussion

43.	A vector is represented by p=3 i + j + 2 k. What is its length in the XY plane?a) 2b) √5c) 110d) 15
Answer» ANSWER: if you PROJECT the VECTOR on to XY plane we'll have P' = 3i+j \|P'\| = √(3²+1²) = √10 Length is √10 in XY plane.

43.

A vector is represented by p=3 i + j + 2 k. What is its length in the XY plane?a) 2b) √5c) 110d) 15

Answer»

ANSWER:

if you PROJECT the VECTOR on to XY plane

we'll have

P' = 3i+j

|P'| = √(3²+1²) = √10

Length is √10 in XY plane.

Discussion

44.	8the distance X moved by a body of mass 0.5 kgunder the action of a force varies with time t asvm) = 3t²+ 4t + 5 (here t is expresed in second)What is the work done by the force in first2 seconds?(2) 40 J(3) 50 J(4) 60 J(1) 20 J
Answer» Answer: Work done = 40 J Explanation: Given ; Mass ( m ) = 0.5 kg $\displaystyle{}v=3t^2+4t+5}\\\\\displaystyle{a=\dfrac{dv}{dt}}\\\\\displaystyle{a=\dfrac{d}{dt}(3t^2+4t+5)}\\\\\displaystyle{a=6t+4}$ putting t = 2 sec we GET a = 6 × 2 + 4 $\displaystyle{a=16m/sec^2}$ Now from NEWTON SECOND law of motion $\displaystyle{s = u t + 1 / 2 at^2}$ Here u = 0 s = 1 / 2 × 16 × 2 × 2 s = 32 m Now for work done ; $\displaystyle{W = \vec{F} \ . \vec {s}}$ W = 0.5 × 16 + 32 J W = 8 + 32 J W = 40 J Thus work done is 40 J

44.

8the distance X moved by a body of mass 0.5 kgunder the action of a force varies with time t asvm) = 3t²+ 4t + 5 (here t is expresed in second)What is the work done by the force in first2 seconds?(2) 40 J(3) 50 J(4) 60 J(1) 20 J

Answer»

Answer:

Work done = 40 J

Explanation:

Given ;

Mass ( m ) = 0.5 kg

$\displaystyle{}v=3t^2+4t+5}\\\\\displaystyle{a=\dfrac{dv}{dt}}\\\\\displaystyle{a=\dfrac{d}{dt}(3t^2+4t+5)}\\\\\displaystyle{a=6t+4}$

putting t = 2 sec we GET

a = 6 × 2 + 4

$\displaystyle{a=16m/sec^2}$

Now from NEWTON SECOND law of motion

$\displaystyle{s = u t + 1 / 2 at^2}$

Here u = 0

s = 1 / 2 × 16 × 2 × 2

s = 32 m

Now for work done ;

$\displaystyle{W = \vec{F} \ . \vec {s}}$

W = 0.5 × 16 + 32 J

W = 8 + 32 J

W = 40 J

Thus work done is 40 J

Discussion

45.	Pollination and its types -_-" ??
Answer» $\huge\underline\mathfrak\pink{Pollination}$ → The transfer of pollen grains from the anther to the STIGMA is CALLED pollination. It is of two types : SELF pollination : The transfer POEM grains from the anther of flower to the stigma of same flower or of another flower born on same plant is called self pollination. CROSS pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination. __________________________!! ❤️❤️"

45.

Pollination and its types -_-" ??

Answer»

$\huge\underline\mathfrak\pink{Pollination}$

→ The transfer of pollen grains from the anther to the STIGMA is CALLED pollination.

It is of two types :

SELF pollination : The transfer POEM grains from the anther of flower to the stigma of same flower or of another flower born on same plant is called self pollination.

CROSS pollination : The transfer of pollen grains from one plant to the stigma of flower of another plant is called cross pollination.

__________________________!! ❤️❤️"

Discussion

46.	Plz solve this differentation
Answer» ANSWER: PLEASE CHECK the FOLLOWING PIC for the answer

46.

Plz solve this differentation

Answer»

ANSWER:

PLEASE CHECK the FOLLOWING PIC for the answer

Discussion

47.	A body is moving upward with a vel0city of 500 what will be the height?
Answer» Answer: 12500 m Explanation: given , u = 500 m/s g = 10 m/s² maximum HEIGHT = u² / 2g Hmax = 500² / 20 = 250000 / 20 =12500 m hope it helped and PLEASE MARK as brainliest:)

47.

A body is moving upward with a vel0city of 500 what will be the height?

Answer»

Answer:

12500 m

Explanation:

given ,

u = 500 m/s

g = 10 m/s²

maximum HEIGHT = u² / 2g

Hmax = 500² / 20

= 250000 / 20

=12500 m

hope it helped and PLEASE MARK as brainliest:)

Discussion

48.	Heya mate!! What do u mean by pollination and what are its types?
Answer» ✿━━━━@Mg━━━━✿ $\boxed{Explained\:Answer}$ ______________________________ ✿━━━━@Mg━━━━✿ $\mathfrak{\huge{\red{ANSWER}}}$ ✿★POLLINATION ✿★The transfer of POLLEN from the anther of ONE flower to stigma of the same flower, or another flower in the same plant, or another flower in a different plant is called pollination. ✿★Therefore, pollination is of two types- self and CROSS pollination. ✿★Self pollination: It occurs in bisexual FLOWERS. It is of two types: ✿★Cross pollination: It can occur in both unisexual and bisexual flowers. ✿★In this TYPE of pollination, pollen is transferred from the anther of one flower of one plant to stigma of another flower of another plant. ________________________________ ʜᴀᴠᴇ ᴀ ɢᴏᴏᴅ ᴅᴀʏ..!

48.

Heya mate!! What do u mean by pollination and what are its types?

Answer»

✿━━━━@Mg━━━━✿

$\boxed{Explained\:Answer}$

______________________________

✿━━━━@Mg━━━━✿

$\mathfrak{\huge{\red{ANSWER}}}$

✿★POLLINATION

✿★The transfer of POLLEN from the anther of ONE flower to stigma of the same flower, or another flower in the same plant, or another flower in a different plant is called pollination.

✿★Therefore, pollination is of two types- self and CROSS pollination.

✿★Self pollination: It occurs in bisexual FLOWERS. It is of two types:

✿★Cross pollination: It can occur in both unisexual and bisexual flowers.

✿★In this TYPE of pollination, pollen is transferred from the anther of one flower of one plant to stigma of another flower of another plant.

________________________________

ʜᴀᴠᴇ ᴀ ɢᴏᴏᴅ ᴅᴀʏ..!

Discussion

49.	What is the magnitude of sum of the vectors p =3i and Q =4ja) 3b) 4c) 5
Answer» Answer: here answer is 5 Explanation: because we FIND magnitude by squaring the both result : √(3)^2+(4)^2 =5 I HOPE U LIKE MY ANSWER‍☠️‍☠️‍☠️

49.

What is the magnitude of sum of the vectors p =3i and Q =4ja) 3b) 4c) 5

Answer»

Answer:

here answer is 5

Explanation:

because we FIND magnitude by squaring the both result :

√(3)^2+(4)^2

=5

I HOPE U LIKE MY ANSWER‍☠️‍☠️‍☠️

Discussion

50.	A beam AB 5m long is supported at it's ends A and B. two point loads w1 and w2 are placed at C and D , 1m and 3m respectively from the end A. if the reaction at A is twice the reaction at B , find the ratio of the loads w1 and w2?
Answer» Answer: the ratio of $W_1$ and $W_2$ is $2:<klux>1</klux>$ Explanation: Let the REACTION at B = R Then Reaction at A = 2R In vertical direction, the forces will be equal Thus $W_1+W_2=2R+R$ $\implies W_1+W_2=3R$ ..............(1) Again Moment with RESPECT to any point will be zero Taking moment w.r.t. A $W_1\times 1+W_2\times 3=R\times 5$ $\implies W_1+3W_2=5R$ $\implies W_1+3W_2=5(\frac{W_1+W_2}{3})$ $\implies 3W_1+9W_2=5W_1+5W_2$ $\implies 2W_1=4W_2$ $\implies \frac{W_1}{W_2}=\frac{2}{1}$ $\implies W_1:W_2=2:1$ Therefore, the ratio of $W_1$ and $W_2$ is $2:1$

50.

A beam AB 5m long is supported at it's ends A and B. two point loads w1 and w2 are placed at C and D , 1m and 3m respectively from the end A. if the reaction at A is twice the reaction at B , find the ratio of the loads w1 and w2?

Answer»

Answer:

the ratio of $W_1$ and $W_2$ is $2:<klux>1</klux>$

Explanation:

Let the REACTION at B = R

Then Reaction at A = 2R

In vertical direction, the forces will be equal

Thus

$W_1+W_2=2R+R$

$\implies W_1+W_2=3R$ ..............(1)

Again Moment with RESPECT to any point will be zero

Taking moment w.r.t. A

$W_1\times 1+W_2\times 3=R\times 5$

$\implies W_1+3W_2=5R$

$\implies W_1+3W_2=5(\frac{W_1+W_2}{3})$

$\implies 3W_1+9W_2=5W_1+5W_2$

$\implies 2W_1=4W_2$

$\implies \frac{W_1}{W_2}=\frac{2}{1}$

$\implies W_1:W_2=2:1$

Therefore, the ratio of $W_1$ and $W_2$ is $2:1$

Discussion

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