67486 + Interview Questions in Secondary School in Physics

1.	Write the magnitude of work done by a force when the angle between direction of displacement and direction of force is theta.PLZZ help me fast!!
Answer» ANSWER: The answer is FScos theta Explanation: Work DONE is the dot PRODUCT of force(F) and displacement(S) multiplied by the cos of the angle between the direction of displacement and the direction of force which is given as theta here

1.

Write the magnitude of work done by a force when the angle between direction of displacement and direction of force is theta.PLZZ help me fast!!

Answer»

The answer is FScos theta

Explanation:

Work DONE is the dot PRODUCT of force(F) and displacement(S) multiplied by the cos of the angle between the direction of displacement and the direction of force which is given as theta here

Discussion

2.	A body of mass 0.5 kg moves with a constant speed of 4 m/s around a horizontal circle of radius 1m, the magnitude of horizontal force acting onbody towards the center of circle is --------- N.
Answer» ANSWER: Given : m=0.5kg R=1m v=4m/s Centripetal force F= mv2/R = 0.5 * 16/ 1 =8 N

2.

A body of mass 0.5 kg moves with a constant speed of 4 m/s around a horizontal circle of radius 1m, the magnitude of horizontal force acting onbody towards the center of circle is --------- N.

Answer»

ANSWER:

Given : m=0.5kg R=1m v=4m/s

Centripetal force F= mv2/R

= 0.5 * 16/ 1

=8 N

Discussion

3.	6. A bearn of light passes foom air intoa medium x. If the angle of incidence be 72and angle of refraction be 40" calculatethe fractive index of medium x.Given thał sin 72=0951. and sin 40=50-0.642
Answer» ANSWER: Given that, Angle of incident i=72 0 Angle of refraction r=40 0 We KNOW that, REFRACTIVE index is n= sinr sini n= 0.642 0.951 n=1.48 Explanation: Hence, the refractive index is of SUBSTANCE is 1.48

3.

6. A bearn of light passes foom air intoa medium x. If the angle of incidence be 72and angle of refraction be 40" calculatethe fractive index of medium x.Given thał sin 72=0951. and sin 40=50-0.642

Answer»

ANSWER:

Given that,

Angle of incident i=72

0

Angle of refraction r=40

0

We KNOW that,

REFRACTIVE index is

n=

sinr

sini

n=

0.642

0.951

n=1.48

Explanation:

Hence, the refractive index is of SUBSTANCE is 1.48

Discussion

4.	What does light do when it passes from glass to water?why?
Answer» Explanation: Hey! $\mathfrak \red{\large \: Answer:-}$ According to Thomson€™s model of the atom, an atom consists of both negatively and positively charged PARTICLES. ... The negatively charged particles are EMBEDDED in the positively charged SPHERE. These negative and positive charges are equal in magnitude. Atoms are electrically NEUTRAL because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion. Thomson knew that atoms had an OVERALL neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom to counterbalance the negative charge on the electrons. ... The plum pudding model depicts the electrons as negatively-charged particles embedded in a sea of positive charge.

4.

What does light do when it passes from glass to water?why?

Answer»

Explanation:

Hey!

$\mathfrak \red{\large \: Answer:-}$

According to Thomson€™s model of the atom, an atom consists of both negatively and positively charged PARTICLES. ... The negatively charged particles are EMBEDDED in the positively charged SPHERE. These negative and positive charges are equal in magnitude.

Atoms are electrically NEUTRAL because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.

Thomson knew that atoms had an OVERALL neutral charge. Therefore, he reasoned that there must be a source of positive charge within the atom to counterbalance the negative charge on the electrons. ... The plum pudding model depicts the electrons as negatively-charged particles embedded in a sea of positive charge.

Discussion

5.	Name the device used to find if a current is induced in an electromagnet.
Answer» ELECTRIC GENERATOR the device USED to find if a current is INDUCED in an electromagnet

Discussion

6.	A) 7.7x10 wb) 8.8x10wc) 9.5x10 Wd) 10.2x104 we) 13.5x10' w8. A 70 kg sportsman runs up a long flight of stairs in 4s. The vertical hecht of theis 4.5 m. What will be his power output in watts?detail explanation
Answer» ANSWER: Explanation: GIVEN mass of sportsman= 70kg Time taken to run up stairs = 4s Height of stairs = 4.5m Therefore = Power = Work/Time = Energy/Time = mgh/t =70104.5/4 = 7.875*10^2 W

6.

A) 7.7x10 wb) 8.8x10wc) 9.5x10 Wd) 10.2x104 we) 13.5x10' w8. A 70 kg sportsman runs up a long flight of stairs in 4s. The vertical hecht of theis 4.5 m. What will be his power output in watts?detail explanation

Answer»

ANSWER:

Explanation:

GIVEN mass of sportsman= 70kg

Time taken to run up stairs = 4s

Height of stairs = 4.5m

Therefore = Power = Work/Time = Energy/Time = mgh/t

=70*10*4.5/4 = 7.875*10^2 W

Discussion

7.	Ram draws the magnetic field lines around a magnet using a compass and pencil. He wants to compare the strengths of the field at two different points. At which point is the magnetic field stronger? 10 pointsa. The point where the field lines are farther apart from one another.b. The point where the field lines are closer to one anotherc. The point near the middle of the magnetd. Cannot sayRam draws the magnetic field lines around a magnet using a compass and pencil. He wants to compare the strengths of the field at two different points. At which point is the magnetic field stronger? 10 pointsa. The point where the field lines are farther apart from one another.b. The point where the field lines are closer to one anotherc. The point near the middle of the magnetd. Cannot say
Answer» EXPLANATION: i don't not SORRY, for the RUDE REPLY

7.

Ram draws the magnetic field lines around a magnet using a compass and pencil. He wants to compare the strengths of the field at two different points. At which point is the magnetic field stronger? 10 pointsa. The point where the field lines are farther apart from one another.b. The point where the field lines are closer to one anotherc. The point near the middle of the magnetd. Cannot sayRam draws the magnetic field lines around a magnet using a compass and pencil. He wants to compare the strengths of the field at two different points. At which point is the magnetic field stronger? 10 pointsa. The point where the field lines are farther apart from one another.b. The point where the field lines are closer to one anotherc. The point near the middle of the magnetd. Cannot say

Answer»

EXPLANATION:

i don't not SORRY, for the RUDE REPLY

Discussion

8.	of the wo9. A horse of mass куpossess more kinetic energy? How?10. The velocity of a body moving in a straight line is increased by applying a constant force F, for somedistance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equalto the work done by the force on the body52Candid New Trends in ICSE Physics - 8
Answer» Answer: hi PLEASE FOLLOW me i PROMISE you follow BACK ooooooookkk

8.

of the wo9. A horse of mass куpossess more kinetic energy? How?10. The velocity of a body moving in a straight line is increased by applying a constant force F, for somedistance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equalto the work done by the force on the body52Candid New Trends in ICSE Physics - 8

Answer»

Answer:

hi PLEASE FOLLOW me i PROMISE you follow BACK ooooooookkk

Discussion

9.	Marine life is safe in cold countries. true or false
Answer» ANSWER: true Explanation: as TEMPERATURE NEAR base of water is more than on above surface

9.

Marine life is safe in cold countries. true or false

Answer»

ANSWER:

true

Explanation:

as TEMPERATURE NEAR base of water is more than on above surface

Discussion

10.	What is theta i? Show the process?
Answer» EXPLANATION: didjdjddj djdjdnd did didnid djdod

10.

What is theta i? Show the process?

Answer»

EXPLANATION:

didjdjddj djdjdnd did didnid djdod

Discussion

11.	The body weight of 5 kg raised with an acceleration of 2 m/s2. Determine the work of the force during the first five seconds.
Answer» work done = Force x displacement force = MASS x acceleration force = 5 x 2 = 10N using the kinematics formula $s = ut + \frac{1}{2} at {}^{2}$ as the weight is initially at rest , u = 0 so, $s = \frac{1}{2} (2)(5) {}^{2}$ s = 25 Work = Fs = 10 x 25 250J hope it helps...

11.

The body weight of 5 kg raised with an acceleration of 2 m/s2. Determine the work of the force during the first five seconds.

Answer»

work done = Force x displacement

force = MASS x acceleration

force = 5 x 2 = 10N

using the kinematics formula

$s = ut + \frac{1}{2} at {}^{2}$

as the weight is initially at rest , u = 0

so,

$s = \frac{1}{2} (2)(5) {}^{2}$

s = 25

Work = Fs

= 10 x 25

250J

hope it helps...

Discussion

12.	If the absolute refractive index of glass and water is-and , respectively then find the ratio of speed of light in water and glass.
Answer» ANSWER: v g v ω = . a μ ω . a μ g = 4 / 3 3 / 2 = 8 9

12.

If the absolute refractive index of glass and water is-and , respectively then find the ratio of speed of light in water and glass.

Answer»

ANSWER:

v

g

v

ω

=

.

a

μ

ω

.

a

μ

g

=

4

/

3

/

2

=

8

9

Discussion

13.	How will Global Warming affect agriculture
Answer» Answer: Climate CHANGE can AFFECT agriculture in a variety of ways. Beyond a certain range of temperatures, warming tends to reduce yields because CROPS speed through their develop- ment, PRODUCING less grain in the process. And higher tem- peratures also interfere with the ABILITY of plants to get and use moisture. Explanation: I hope it will be help you ❤️❤️❤️

13.

How will Global Warming affect agriculture

Answer»

Answer:

Climate CHANGE can AFFECT agriculture in a variety of ways. Beyond a certain range of temperatures, warming tends to reduce yields because CROPS speed through their develop- ment, PRODUCING less grain in the process. And higher tem- peratures also interfere with the ABILITY of plants to get and use moisture.

Explanation:

I hope it will be help you ❤️❤️❤️

Discussion

14.	How to find surface temperature of a star
Answer» Answer: ONE way of classifying STARS is by their TEMPERATURE; stellar temperatures run from about 2500 Kelvin to about 50,000 Ke

14.

How to find surface temperature of a star

Answer»

Answer:

ONE way of classifying STARS is by their TEMPERATURE; stellar temperatures run from about 2500 Kelvin to about 50,000 Ke

Discussion

15.	Light passing through the focal point of a concaveminor reflected from the minor. Draw thereflected ray.
Answer» Answer: Here is your answer DUDE MAY it helps you EXPLANATION: HAPPY to HELP

15.

Light passing through the focal point of a concaveminor reflected from the minor. Draw thereflected ray.

Answer»

Answer:

Here is your answer DUDE MAY it helps you

EXPLANATION:

HAPPY to HELP

Discussion

16.	If the length of a cylinder is /= (4.00 +0.001) cm, radius r= (0.0250 +0.001) emand mass m = (6.25 +0.01) g, calculate the percentage error in the determination ofits density
Answer» The ANSWER is in ATTACHED PHOTO.

Discussion

17.	Pls answer no spam
Answer» ANSWER: s-block elements are NA and Ca p-block elements are C and P d-block elements are Ti and NI

17.

Pls answer no spam

Answer»

ANSWER:

s-block elements are NA and Ca

p-block elements are C and P

d-block elements are Ti and NI

Discussion

18.	Q.7If the sum and difference of magnitude of two vector is 10 and 4 unit respectively.If they act perpendicular to each other, find the magnitude of their resultant.
Answer» ANSWER: √100 + 16 = √116 is the answer

18.

Q.7If the sum and difference of magnitude of two vector is 10 and 4 unit respectively.If they act perpendicular to each other, find the magnitude of their resultant.

Answer»

ANSWER:

√100 + 16 = √116 is the answer

Discussion

19.	Find the angles between two vectors P and Q if resultant of vectors given by R²=P²+Q²
Answer» ANSWER: HOPE this answer HELPS ✌✌ mark me as a brainiliest follow me

19.

Find the angles between two vectors P and Q if resultant of vectors given by R²=P²+Q²

Answer»

ANSWER:

HOPE this answer HELPS ✌✌

mark me as a brainiliest

follow me

Discussion

20.	A body thrown up possesses only potential energy at the maximum height of its flight. true or false
Answer» ANSWER: FALSE...............

20.

A body thrown up possesses only potential energy at the maximum height of its flight. true or false

Answer»

ANSWER:

FALSE...............

Discussion

21.	A anual nubber ball is released from a heightof 800 mm on horizontal floor aarthafirst bounce it raises to hecht of themthe coeficient of restitutionis
Answer» ANSWER: 018366 Explanation: this is RIGHT answer

21.

A anual nubber ball is released from a heightof 800 mm on horizontal floor aarthafirst bounce it raises to hecht of themthe coeficient of restitutionis

Answer»

ANSWER:

018366

Explanation:

this is RIGHT answer

Discussion

22.	What will be the weight of a man on the moon if his mass on earth is 120 Kg?
Answer» Answer: WEIGHT is the gravitational pull which is exerted by a celestial body on an object of specific mass. Mass is the MEASURE of an AMOUNT of matter of an object and it is constanst entity. Now, to measure the Weight of an object we have to multiply mass and it's gravitational ACCELERATION exerted by celestial body. So, W=m x g For calculating weight on moon we have to find the mass of a man on earth. W=m x g 120=m x 9.81 ( gravitational acceleration of earth is 9.81 m/s²) mass = 12.23 kg. So, For the weight of a man on moon will be W = 12.23 x 1.62 (gravitational acceleration of moon is 1.62 m/s²) W = 19.81 N. Or, simply weight of an object on moon will 1/6 of Earth's weight . So, 120/6 = 20 N

22.

What will be the weight of a man on the moon if his mass on earth is 120 Kg?

Answer»

Answer:

WEIGHT is the gravitational pull which is exerted by a celestial body on an object of specific mass.

Mass is the MEASURE of an AMOUNT of matter of an object and it is constanst entity.

Now, to measure the Weight of an object we have to multiply mass and it's gravitational ACCELERATION exerted by celestial body.

So, W=m x g

For calculating weight on moon we have to find the mass of a man on earth.

W=m x g

120=m x 9.81 ( gravitational acceleration of earth is 9.81 m/s²)

mass = 12.23 kg.

So, For the weight of a man on moon will be

W = 12.23 x 1.62 (gravitational acceleration of moon is 1.62 m/s²)

W = 19.81 N.

Or, simply weight of an object on moon will 1/6 of Earth's weight .

So, 120/6 = 20 N

Discussion

23.	The wheel of a moving cycle only has potential energy. true or false
Answer» ANSWER: false Explanation: it ALSO has KINETIC ENERGY as it's in MOTION

23.

The wheel of a moving cycle only has potential energy. true or false

Answer»

ANSWER:

false

Explanation:

it ALSO has KINETIC ENERGY as it's in MOTION

Discussion

24.	Give the same examples on stability in our daily life
Answer» Stability is the STATE of being resistant to CHANGE and not prone to wild fluctuations in emotion. An example of stability is a CALM, STABLE life where you don't have wild UPS and downs. MARK ME AS BRAINLIST

24.

Give the same examples on stability in our daily life

Answer»

Stability is the STATE of being resistant to CHANGE and not prone to wild fluctuations in emotion. An example of stability is a CALM, STABLE life where you don't have wild UPS and downs.

MARK ME AS BRAINLIST

Discussion

25.	How many, sheep would be neededto obtain the wool Ho prepare Sweat-ess for every one en india?
Answer» ANSWER: SHEARING is the most IMPORTANT

25.

How many, sheep would be neededto obtain the wool Ho prepare Sweat-ess for every one en india?

Answer»

ANSWER:

SHEARING is the most IMPORTANT

Discussion

26.	A charged particpe is in motion having initial v when it enters into a region of uniform magnetic field perpendicular to v. Because of the magnetic force the kinetic energy of the particle will
Answer» Answer: The magnetic FORCE acts PERPENDICULAR to the velocity of the particle. This causes circular motion. In the magnetic field, the speed and KINETIC energy of the particle remains constant, but the direction is altered at each instant by the perpendicular magnetic force. Hence the kinetic energy remains constant

26.

A charged particpe is in motion having initial v when it enters into a region of uniform magnetic field perpendicular to v. Because of the magnetic force the kinetic energy of the particle will

Answer»

Answer:

The magnetic FORCE acts PERPENDICULAR to the velocity of the particle. This causes circular motion. In the magnetic field, the speed and KINETIC energy of the particle remains constant, but the direction is altered at each instant by the perpendicular magnetic force.

Hence the kinetic energy remains constant

Discussion

27.	A man of mass 50kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s^2)
Answer» $\sf \red{❥Hope \: it \: helps \: you....}$

27.

A man of mass 50kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s^2)

Answer»

$\sf \red{❥Hope \: it \: helps \: you....}$

Discussion

28.	Why does metal wire offer resistance when connected to a battery?
Answer» $hello$ In a metal there are many free electrons and POSITIVELY charged atoms these free electrons MOVE in any DIRECTION the LIKE. But when the metal wire connected to a battery, these electrons move in a definite direction. THUS the obstruction caused to the electrons during their movement is known as resistance. I hope my answer helps you....✌

28.

Why does metal wire offer resistance when connected to a battery?

Answer»

$hello$

In a metal there are many free electrons and POSITIVELY charged atoms these free electrons MOVE in any DIRECTION the LIKE. But when the metal wire connected to a battery, these electrons move in a definite direction. THUS the obstruction caused to the electrons during their movement is known as resistance.

I hope my answer helps you....✌

Discussion

29.	A car moving at 150 km per hour is approaching a stationary police car whose radar speed detector operates at a frequency of 15 GHz. What frequency change is found by the speed detector?
Answer» Explanation: Vr=150km/h * 5/18 Vr = 41.66m/s. F = ((V-Vr)/(V+Vs))Fo. F=((343-41.66) / (343+0))15 = 13.178 HZ CHANGE = 15 - 13.178 = 1.822 GHz.

29.

A car moving at 150 km per hour is approaching a stationary police car whose radar speed detector operates at a frequency of 15 GHz. What frequency change is found by the speed detector?

Answer»

Explanation:

Vr=150km/h * 5/18

Vr = 41.66m/s.

F = ((V-Vr)/(V+Vs))*Fo.

F=((343-41.66) / (343+0))*15 = 13.178 HZ

CHANGE = 15 - 13.178 = 1.822 GHz.

Discussion

30.	State any two ways to maximize In impact of global warming
Answer» Explanation: A cell wall is a structural LAYER surrounding some types of CELLS, just outside the cell membrane. It can be tough, FLEXIBLE, and sometimes rigid. It provides the cell with both structural SUPPORT and protection, and also acts as a filtering mechanism

30.

State any two ways to maximize In impact of global warming

Answer»

Explanation:

A cell wall is a structural LAYER surrounding some types of CELLS, just outside the cell membrane. It can be tough, FLEXIBLE, and sometimes rigid. It provides the cell with both structural SUPPORT and protection, and also acts as a filtering mechanism

Discussion

31.	10of 2 amp is drawn by a filament by anbulb. No. of electrons passing through aion of the filament in 8 seconds wouldmately10110(2) 10"10.(4)
Answer» Answer: A CURRENT of 1 A is drawn by a filament of an electric BULB. Number of electrons PASSING through a cross SECTION of the filament in 16 seconds would be roughly:

31.

10of 2 amp is drawn by a filament by anbulb. No. of electrons passing through aion of the filament in 8 seconds wouldmately10110(2) 10"10.(4)

Answer»

Answer:

A CURRENT of 1 A is drawn by a filament of an electric BULB. Number of electrons PASSING through a cross SECTION of the filament in 16 seconds would be roughly:

Discussion

32.	When electric bulb switched on, what energy transformation takes place
Answer» When we SWITCH on an ELECTRIC bulb, electric energy is converted into light energy and heat energy. This happens because of heating EFFECT of electric current. ________________________ hope it helps......

32.

When electric bulb switched on, what energy transformation takes place

Answer»

When we SWITCH on an ELECTRIC bulb, electric energy is converted into light energy and heat energy. This happens because of heating EFFECT of electric current.

________________________

hope it helps......

Discussion

33.	Give an expression for linear momentum of a system of particle and prove P is constant.
Answer» <P>Answer: Linear Momentum of a System of Particles. Linear momentum is a PRODUCT of the mass (m) of an object and the velocity (V) of the object. ... The formula for linear momentum is p = mv. The total amount of momentum never changes, and this property is called conservation of momentum. Explanation: PLEASE MARK me brilliantest

33.

Give an expression for linear momentum of a system of particle and prove P is constant.

Answer»

<P>Answer:

Linear Momentum of a System of Particles. Linear momentum is a PRODUCT of the mass (m) of an object and the velocity (V) of the object. ... The formula for linear momentum is p = mv. The total amount of momentum never changes, and this property is called conservation of momentum.

Explanation:

PLEASE MARK me brilliantest

Discussion

34.	The C. G. of a wire bend forming a quarter drcular arc with radius 100 mm ls
Answer» ANSWER: isthmus I have to go to the gym and then I have no where that at LEAST ONE person to get it to the now I'm just SAYING it is the FIRST place I was in a while

34.

The C. G. of a wire bend forming a quarter drcular arc with radius 100 mm ls

Answer»

ANSWER:

isthmus I have to go to the gym and then I have no where that at LEAST ONE person to get it to the now I'm just SAYING it is the FIRST place I was in a while

Discussion

35.	What is gravitation
Answer» Explanation: Gravity, also called GRAVITATION, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a WEIGHT, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the ACCELERATION that it GIVES to FREELY falling objects. HELPS YOU ✌✌

35.

What is gravitation

Answer»

Explanation:

Gravity, also called GRAVITATION, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a WEIGHT, or downward force of gravity, proportional to their mass, which Earth's mass exerts on them. Gravity is measured by the ACCELERATION that it GIVES to FREELY falling objects.

HELPS YOU ✌✌

Discussion

36.	How to measure the speed of an object illustrate with an activity
Answer» EXPLANATION: $\huge\pink{➪ᴥ︎︎︎︎︎︎\: hello\:bro}$

36.

How to measure the speed of an object illustrate with an activity

Answer»

EXPLANATION:

$\huge\pink{➪ᴥ︎︎︎︎︎︎\: hello\:bro}$

Discussion

37.	(Example 1.7: The acceleration due to gravity is idetermined by using a simple pendulum oflengthI= (100+ 0.1) cm. If its time period is T = (2+0.01) s, find the maximum percentage error inthe measurement of g.S
Answer» ANSWER: ANS G Explanation: The MAXIMUM PERCENTAGE is g

37.

(Example 1.7: The acceleration due to gravity is idetermined by using a simple pendulum oflengthI= (100+ 0.1) cm. If its time period is T = (2+0.01) s, find the maximum percentage error inthe measurement of g.S

Answer»

ANSWER:

ANS G

Explanation:

The MAXIMUM PERCENTAGE is g

Discussion

38.	An object is thrown with initial speed 5ms-1 with an angle of projection 30°calculate the maximum height reached and the horizontal angle
Answer» ANSWER: HEIGHT =0.3125 m range = 2.165 m Explanation: height = (Usin(theta))^2/2g = 25/4 1/20 =0.3125 range = u^2sin(2theta)/g = 25√3/21/10=2.165

38.

An object is thrown with initial speed 5ms-1 with an angle of projection 30°calculate the maximum height reached and the horizontal angle

Answer»

ANSWER:

HEIGHT =0.3125 m

range = 2.165 m

Explanation:

height = (U*sin(theta))^2/2g = 25/4 * 1/20 =0.3125

range = u^2*sin(2*theta)/g = 25*√3/2*1/10=2.165

Discussion

39.	The time of oscillation (t) of a small drop of liquid under surface tension depends upon density (d) the radius (r) and surface tension (T) Find formula for time of oscillation by using dimension analysis
Answer» Answer: The time period of oscillation T of a small DROP of liquid under SURFACE TENSION depends upon the density of liquid (p) , radius (r) and surface tension (S). A STUDENT obtains the following expression for T : T = Spr3

39.

The time of oscillation (t) of a small drop of liquid under surface tension depends upon density (d) the radius (r) and surface tension (T) Find formula for time of oscillation by using dimension analysis

Answer»

Answer:

The time period of oscillation T of a small DROP of liquid under SURFACE TENSION depends upon the density of liquid (p) , radius (r) and surface tension (S). A STUDENT obtains the following expression for T : T = Spr3

Discussion

40.	Value of k in coulomb law depends upon
Answer» Answer: Image result for value of k in coulomb law depends upon The symbol k is a proportionality CONSTANT known as the Coulomb's law constant. The value of this constant is DEPENDENT upon the medium that the charged objects are immersed in. In the case of AIR, the value is approximately 9.0 X 109 N • m2 / C2. Explanation: plz MARK me as brainiest.

40.

Value of k in coulomb law depends upon

Answer»

Answer:

Image result for value of k in coulomb law depends upon

The symbol k is a proportionality CONSTANT known as the Coulomb's law constant. The value of this constant is DEPENDENT upon the medium that the charged objects are immersed in. In the case of AIR, the value is approximately 9.0 X 109 N • m2 / C2.

Explanation:

plz MARK me as brainiest.

Discussion

41.	an arrow is shot into air with a velocity of 60 m/s at an angle of 30°. find the maximum height the arrow at ends and the range of the arrow. please solve this problem with explanation...
Answer» Given : Initial velocity = 60 m/s Angle of inclination = 30° To Find : MAXIMUM height reached and range of projectile. Solution : ❒ A body is said to be projectile if it is projected into space with some initial velocity and then it continues to move in a vertical plane such that its horizontal ACCELERATION is zero and vertical downward acceleration is equal to g. A] Maximum Height : $\sf:\implies\:H=\dfrac{u^2sin^2\theta}{2g}$ $\sf:\implies\:H=\dfrac{(60)^2\times sin^230^{\circ}}{2(10)}$ $\sf:\implies\:H=\dfrac{3600\times (1/2)^2}{20}$ $\sf:\implies\:H=180\times \dfrac{1}{4}$ $:\implies\:\underline{\boxed{\bf{\purple{H=45\:m}}}}$ B] Horizontal Range : $\sf:\implies\:R=\dfrac{u^2sin2\theta}{g}$ $\sf:\implies\:R=\dfrac{(60)^2sin2(30)^{\circ}}{10}$ $\sf:\implies\:R=360\times sin60^{\circ}$ $\sf:\implies\:R=360\times\dfrac{\sqrt3}{2}$ $\sf:\implies\:R=180\times\sqrt3$ $:\implies\:\underline{\boxed{\bf{\gray{R=311.4\:m}}}}$

41.

an arrow is shot into air with a velocity of 60 m/s at an angle of 30°. find the maximum height the arrow at ends and the range of the arrow. please solve this problem with explanation...

Answer»

Given :

Initial velocity = 60 m/s

Angle of inclination = 30°

To Find :

MAXIMUM height reached and range of projectile.

Solution :

❒ A body is said to be projectile if it is projected into space with some initial velocity and then it continues to move in a vertical plane such that its horizontal ACCELERATION is zero and vertical downward acceleration is equal to g.

A] Maximum Height :

$\sf:\implies\:H=\dfrac{u^2sin^2\theta}{2g}$

$\sf:\implies\:H=\dfrac{(60)^2\times sin^230^{\circ}}{2(10)}$

$\sf:\implies\:H=\dfrac{3600\times (1/2)^2}{20}$

$\sf:\implies\:H=180\times \dfrac{1}{4}$

$:\implies\:\underline{\boxed{\bf{\purple{H=45\:m}}}}$

B] Horizontal Range :

$\sf:\implies\:R=\dfrac{u^2sin2\theta}{g}$

$\sf:\implies\:R=\dfrac{(60)^2sin2(30)^{\circ}}{10}$

$\sf:\implies\:R=360\times sin60^{\circ}$

$\sf:\implies\:R=360\times\dfrac{\sqrt3}{2}$

$\sf:\implies\:R=180\times\sqrt3$

$:\implies\:\underline{\boxed{\bf{\gray{R=311.4\:m}}}}$

Discussion

42.	A convex lens with focal length 30cm at what distance the object should be placed from lens so that it forms a image at 60cm in the other sider of lens find the magnification produce by the lens
Answer» Answer: The object should be placed at 60 cm on LEFT side of the lens. The magnification PRODUCED by the lens is - 1. Explanation: We have GIVEN that, Focal length of convex lens ( f ) = 30 cm Image DISTANCE ( v ) = 60 cm We have to find, Object distance ( u ) and Magnification of lens ( M ) Now, we know that, $\displaystyle{\pink{\sf\:\dfrac{1}{f}\:=\:\dfrac{1}{v}\:-\:\dfrac{1}{u}}\sf\:\:\:-\:-\:[\:Lens\:Formula\:]}$ $\displaystyle{\implies\sf\:\dfrac{1}{30}\:=\:\dfrac{1}{60}\:-\:\dfrac{1}{u}}$ $\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:\dfrac{1}{60}\:-\:\dfrac{1}{30}}$ $\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:\dfrac{30\:-\:60}{60\:\times\:30}}$ $\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\dfrac{3\cancel{0}}{180\cancel{0}}}$ $\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\cancel{\dfrac{3}{180}}}$ $\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\dfrac{1}{60}}$ $\displaystyle{\implies\sf\:-\:u\:=\:60}$ $\displaystyle{\implies\boxed{\red{\sf\:u\:=\:-\:60\:cm}}}$ The object should be placed at 60 cm on left side of the lens. ───────────────────── Now, $\displaystyle{\pink{\sf\:Magnification\:=\:\dfrac{Image\:height}{Object\:height}}}$ $\displaystyle{\implies\sf\:Magnification\:=\:\dfrac{v}{u}}$ $\displaystyle{\implies\sf\:Magnification\:=\:-\:\cancel{\dfrac{60}{60}}}$ $\displaystyle{\implies\boxed{\red{\sf\:Magnification\:=\:-\:1}}}$ The magnification produced by the lens is - 1. From the negative sign of magnification, we can say that the nature of the image formed is real and inverted.

42.

A convex lens with focal length 30cm at what distance the object should be placed from lens so that it forms a image at 60cm in the other sider of lens find the magnification produce by the lens

Answer»

Answer:

The object should be placed at 60 cm on LEFT side of the lens.

The magnification PRODUCED by the lens is - 1.

Explanation:

We have GIVEN that,

Focal length of convex lens ( f ) = 30 cm

Image DISTANCE ( v ) = 60 cm

We have to find,

Object distance ( u ) and

Magnification of lens ( M )

Now, we know that,

$\displaystyle{\pink{\sf\:\dfrac{1}{f}\:=\:\dfrac{1}{v}\:-\:\dfrac{1}{u}}\sf\:\:\:-\:-\:[\:Lens\:Formula\:]}$

$\displaystyle{\implies\sf\:\dfrac{1}{30}\:=\:\dfrac{1}{60}\:-\:\dfrac{1}{u}}$

$\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:\dfrac{1}{60}\:-\:\dfrac{1}{30}}$

$\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:\dfrac{30\:-\:60}{60\:\times\:30}}$

$\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\dfrac{3\cancel{0}}{180\cancel{0}}}$

$\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\cancel{\dfrac{3}{180}}}$

$\displaystyle{\implies\sf\:\dfrac{1}{u}\:=\:-\:\dfrac{1}{60}}$

$\displaystyle{\implies\sf\:-\:u\:=\:60}$

$\displaystyle{\implies\boxed{\red{\sf\:u\:=\:-\:60\:cm}}}$

The object should be placed at 60 cm on left side of the lens.

─────────────────────

Now,

$\displaystyle{\pink{\sf\:Magnification\:=\:\dfrac{Image\:height}{Object\:height}}}$

$\displaystyle{\implies\sf\:Magnification\:=\:\dfrac{v}{u}}$

$\displaystyle{\implies\sf\:Magnification\:=\:-\:\cancel{\dfrac{60}{60}}}$

$\displaystyle{\implies\boxed{\red{\sf\:Magnification\:=\:-\:1}}}$

The magnification produced by the lens is - 1.

From the negative sign of magnification, we can say that the nature of the image formed is real and inverted.

Discussion

43.	The device used to measure electrical energy
Answer» ANSWER: ᴀᴍᴍᴇᴛᴇʀ Explanation: ɪᴛ'ꜱ ꜱɪᴍᴩʟᴇ ᴅᴜᴅᴇ

43.

The device used to measure electrical energy

Answer»

ANSWER:

ᴀᴍᴍᴇᴛᴇʀ

Explanation:

ɪᴛ'ꜱ ꜱɪᴍᴩʟᴇ ᴅᴜᴅᴇ

Discussion

44.	Give one factor on which strength of induced current depends...???
Answer» ANSWER: നിങ്ങളെ കാണുന്നത് പുനരാരംഭിക്കുന്നതിന് ലോഗിൻ ചെയ്യുന്നതിനുള്ള അദ്ദേഹത്തിന്റെ ഐക്കൺ കുറച്ച് മിനിറ്റ് മുമ്പാണ്, നിങ്ങൾക്ക് എന്തെങ്കിലും ചോദ്യങ്ങളുണ്ടോ അല്ലെങ്കിൽ കൂടുതൽ വിവരങ്ങൾ ആവശ്യമുണ്ടോ എന്ന് ഞാൻ ആശ്ചര്യപ്പെട്ടു, ദയവായി എന്നെ ബന്ധപ്പെടുക അതെ അതെ ഞാൻ അയച്ച ഈ കോഡിനെ സഹായിക്കുന്നു

44.

Give one factor on which strength of induced current depends...???

Answer»

ANSWER:

നിങ്ങളെ കാണുന്നത് പുനരാരംഭിക്കുന്നതിന് ലോഗിൻ ചെയ്യുന്നതിനുള്ള അദ്ദേഹത്തിന്റെ ഐക്കൺ കുറച്ച് മിനിറ്റ് മുമ്പാണ്, നിങ്ങൾക്ക് എന്തെങ്കിലും ചോദ്യങ്ങളുണ്ടോ അല്ലെങ്കിൽ കൂടുതൽ വിവരങ്ങൾ ആവശ്യമുണ്ടോ എന്ന് ഞാൻ ആശ്ചര്യപ്പെട്ടു, ദയവായി എന്നെ ബന്ധപ്പെടുക അതെ അതെ ഞാൻ അയച്ച ഈ കോഡിനെ സഹായിക്കുന്നു

Discussion

45.	2 points7. V.S.E.P.R.T. के अनुसार मेथेन(CH4) अणु की संरचना होगी-*O रेखीय (Linear)O त्रिकोणीय समतली (Trigonal planer)O अष्टफलकीय (Octahedral)O चतुष्फलकीय (Terahedral)
Answer» ANSWER: Gsjdkjhdhhdjdjskhdhdhdjdjdj Shjdkdidhhdjdkdjhdksjdgsohshdidhhdjdh Vdjdkdjhdjdkhdjdodjhdhdjkdhdjdjksjshf Dbskosjhsidheyyemosdgdokwhwujdjje

45.

2 points7. V.S.E.P.R.T. के अनुसार मेथेन(CH4) अणु की संरचना होगी-*O रेखीय (Linear)O त्रिकोणीय समतली (Trigonal planer)O अष्टफलकीय (Octahedral)O चतुष्फलकीय (Terahedral)

Answer»

ANSWER:

Gsjdkjhdhhdjdjskhdhdhdjdjdj

Shjdkdidhhdjdkdjhdksjdgsohshdidhhdjdh

Vdjdkdjhdjdkhdjdodjhdhdjkdhdjdjksjshf

Dbskosjhsidheyyemosdgdokwhwujdjje

Discussion

46.	A rectangular board is measured with a scale having accuracy of 0.2 cm. The length and b are measured as 35.4 and 18.4 cm respectively. Find the relative error and percentage error of the area calculated.
Answer» The ANSWER is in ATTACHED PHOTO.

Discussion

47.	What do you mean by aNomalous explain of water
Answer» Answer: The anomalous expansion of water is an abnormal property of water whereby it expands instead of CONTRACTING when the TEMPERATURE goes from 4oC to 0oC and it becomes LESS dense. The density becomes less and less as it freezes because molecules of water normally FORM OPEN crystal structures when in solid form.

47.

What do you mean by aNomalous explain of water

Answer»

Answer:

The anomalous expansion of water is an abnormal property of water whereby it expands instead of CONTRACTING when the TEMPERATURE goes from 4oC to 0oC and it becomes LESS dense. The density becomes less and less as it freezes because molecules of water normally FORM OPEN crystal structures when in solid form.

Discussion

48.	A car starts from rest on a curve of radius 100 m and accelerates at constant tangentialacceleration at 3 m/sw. The normal component of acceleration at t=10s is____ m/s2.Options1)32)63)94)0
Answer» ANSWER: 6 is the answer DUDE. I don't KNOW how but it's 6.

48.

A car starts from rest on a curve of radius 100 m and accelerates at constant tangentialacceleration at 3 m/sw. The normal component of acceleration at t=10s is____ m/s2.Options1)32)63)94)0

Answer»

ANSWER:

6 is the answer DUDE. I don't KNOW how but it's 6.

Discussion

49.	Find an expression for fringwidth in terms of wavelength of light separation between the holes and the distance of the screen from the holes ( give detailed description along with drag)
Answer» ANSWER: distance = (1/2)at2 + v0t 10 = (1/2)(20)(12) + v0(1) SOLVE for v0, the INITIAL velocity. Explanation:

49.

Find an expression for fringwidth in terms of wavelength of light separation between the holes and the distance of the screen from the holes ( give detailed description along with drag)

Answer»

ANSWER:

distance = (1/2)at2 + v0t

10 = (1/2)(20)(12) + v0(1)

SOLVE for v0, the INITIAL velocity.

Explanation:

Discussion

50.	a train 500 m long crosses a bridge of 1000 m in 10 s find the average speed of the train when it just crosses the bridge
Answer» Answer: 150m/s Explanation:

50.

a train 500 m long crosses a bridge of 1000 m in 10 s find the average speed of the train when it just crosses the bridge

Answer»

Answer:

150m/s

Explanation:

Discussion

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