67486 + Interview Questions in Secondary School in Physics

1.	A particle is fired from ground with the speed u making an angle theta with the horizontal. The speed of the particle just before hitting the ground will be(1)u(2)u costheta(3)u/2(4)u sintheta
Answer» Answer: a)u Explanation: Given: INITIAL speed of the particle =u Angle made by particle with horizontal= $\theta$ Now when the particle FALLS back to the ground its displacement is 0 The initial velocity of particle in y direction= $u\sin\theta$ The initial velocity of particle in x direction= $u\cos\theta$ From the Equation of motion under GRAVITY in y direction we have $y=u\sin\theta-\dfrac{gt^2}{2}\\0=u\sin\theta-\dfrac{gt^2}{2}\\\\t=\dfrac{2u\sin\theta}{g}$ The y- component of velocity just before the particle hits the ground be $v_y$ given by $v_y=u\sin\theta-g\times\dfrac{2u\sin\theta}{g}\\=-u\sin\theta$ The x-component of velocity is CONSTANT as their is no acceleration in x direction The net velocity be $v_{net}$ $v_{net}=\sqrt{(u\cos\theta)^2 +(-u\sin\theta)^2}\\=u$

1.

A particle is fired from ground with the speed u making an angle theta with the horizontal. The speed of the particle just before hitting the ground will be(1)u(2)u costheta(3)u/2(4)u sintheta

Answer»

Answer:

a)u

Explanation:

Given:

INITIAL speed of the particle =u

Angle made by particle with horizontal= $\theta$

Now when the particle FALLS back to the ground its displacement is 0

The initial velocity of particle in y direction= $u\sin\theta$

The initial velocity of particle in x direction= $u\cos\theta$

From the Equation of motion under GRAVITY in y direction we have

$y=u\sin\theta-\dfrac{gt^2}{2}\\0=u\sin\theta-\dfrac{gt^2}{2}\\\\t=\dfrac{2u\sin\theta}{g}$

The y- component of velocity just before the particle hits the ground be $v_y$ given by

$v_y=u\sin\theta-g\times\dfrac{2u\sin\theta}{g}\\=-u\sin\theta$

The x-component of velocity is CONSTANT as their is no acceleration in x direction

The net velocity be $v_{net}$

$v_{net}=\sqrt{(u\cos\theta)^2 +(-u\sin\theta)^2}\\=u$

Discussion

2.	13. A ball is dropped from certain height such that thedistance travelled in last second is equal to thedistance travelled in first three second. Find its height
Answer» Answer: Hello! This may help you for SURE! Formula USED: sn=u+g/2(2n−1) Answer:125m Explanation: The distance covered in first 3 second s=1/2gt^2 =1^2×10×3^2 =45 Ball TAKES 'n' seconds to fall to the GROUND. The distance covered in the NTH second is sn=u+g/2(2n−1) =10/2(2n−1) =10n−5 Therefore 45=10n−5 n=5=t Therefore h=12*gt^2 =12×10×25 =125m

2.

13. A ball is dropped from certain height such that thedistance travelled in last second is equal to thedistance travelled in first three second. Find its height

Answer»

Answer: Hello! This may help you for SURE!

Formula USED:

sn=u+g/2(2n−1)

Answer:125m

Explanation:

The distance covered in first 3 second

s=1/2gt^2

=1^2×10×3^2

=45

Ball TAKES 'n' seconds to fall to the GROUND. The distance covered in the NTH second is

sn=u+g/2(2n−1)

=10/2(2n−1)

=10n−5

Therefore 45=10n−5

n=5=t

Therefore h=12*gt^2

=12×10×25

=125m

Discussion

3.	If action is always equal to the reaction,explain how a horse can pull a cart
Answer» Answer: ACCORDING to Newton's third LAW of motion, action force is equal to reaction but acts on two different bodies and in opposite DIRECTIONS. When a horse pushes the ground, the ground reacts and EXERTS a force on the horse in the forward direction. This force is ABLE to overcome friction force of the cart and it moves. Explanation:

3.

If action is always equal to the reaction,explain how a horse can pull a cart

Answer»

Answer:

ACCORDING to Newton's third LAW of motion, action force is equal to reaction but acts on two different bodies and in opposite DIRECTIONS. When a horse pushes the ground, the ground reacts and EXERTS a force on the horse in the forward direction. This force is ABLE to overcome friction force of the cart and it moves.

Explanation:

Discussion

4.	A particle is fired from ground with speed u making an angle theta with the horizontal. The speed of the particle just before hitting the ground will be
Answer» Answer: let, VELOCITY=v Time taken by projectile=t initial velocity =u Angle =theta we know , when time FLIGHT is given, u= tg/2sin(theta) when Horizental range is given, u=Rg/sin(2theta)

4.

A particle is fired from ground with speed u making an angle theta with the horizontal. The speed of the particle just before hitting the ground will be

Answer»

Answer:

let,

VELOCITY=v

Time taken by projectile=t

initial velocity =u

Angle =theta

we know ,

when time FLIGHT is given,

u= tg/2sin(theta)

when Horizental range is given,

u=Rg/sin(2theta)

Discussion

5.	Types of forces based on the application
Answer» ANSWER: HEAT force is EXPLANATION: heat force because it is the RIGHT answer of this QUESTION

5.

Types of forces based on the application

Answer»

ANSWER:

HEAT force is

EXPLANATION:

heat force because it is the RIGHT answer of this QUESTION

Discussion

6.	A man does 200 J of work in 10 seconds and a boy does 100 J of work in4 seconds. Who is delivering more power?
Answer» ANSWER: p=w/t p=200/10=20 p'=100/4=25 p'>p Explanation: BOY is DELIVERING more POWER

6.

A man does 200 J of work in 10 seconds and a boy does 100 J of work in4 seconds. Who is delivering more power?

Answer»

ANSWER:

p=w/t

p=200/10=20

p'=100/4=25

p'>p

Explanation:

BOY is DELIVERING more POWER

Discussion

7.	a among eight planets of our solar system Earth is the only planet supporting life explain how we should protect our earth and its environment
Answer» Answer: protection of environment: Prevent and control degradation of land, water, vegetation and air. Conserve and enhance natural and man-made heritage, including biological diversity of unique ecosystems. Improve condition and productivity of degraded areas. Raise awareness and understanding of the link between environment and development. protection of EARTH: Reduce, reuse, and recycle. Cut down on what you throw away. Follow the three "R's" to conserve natural resources and LANDFILL space. Volunteer. Volunteer for cleanups in your community. You can get involved in protecting your watershed, too. Educate. When you further your own education, you can help others understand the importance and value of our natural resources. Conserve water. The less water you use, the less runoff and wastewater that eventually end up in the ocean. CHOOSE sustainable. Learn how to MAKE smart seafood choices at www.fishwatch.gov. Shop wisely. Buy less plastic and bring a reusable SHOPPING bag. Use long-lasting light bulbs. Energy efficient light bulbs reduce greenhouse gas emissions. Also flip the light switch off when you leave the room! Plant a tree. Trees provide food and oxygen. They help save energy, clean the air, and help combat climate change. Don't send chemicals into our waterways. Choose non-toxic chemicals in the home and office.

7.

a among eight planets of our solar system Earth is the only planet supporting life explain how we should protect our earth and its environment

Answer»

Answer:

protection of environment:

Prevent and control degradation of land, water, vegetation and air. Conserve and enhance natural and man-made heritage, including biological diversity of unique ecosystems. Improve condition and productivity of degraded areas. Raise awareness and understanding of the link between environment and development.

protection of EARTH:

Reduce, reuse, and recycle. Cut down on what you throw away. Follow the three "R's" to conserve natural resources and LANDFILL space.

Volunteer. Volunteer for cleanups in your community. You can get involved in protecting your watershed, too.

Educate. When you further your own education, you can help others understand the importance and value of our natural resources.

Conserve water. The less water you use, the less runoff and wastewater that eventually end up in the ocean.

CHOOSE sustainable. Learn how to MAKE smart seafood choices at www.fishwatch.gov.

Shop wisely. Buy less plastic and bring a reusable SHOPPING bag.

Use long-lasting light bulbs. Energy efficient light bulbs reduce greenhouse gas emissions. Also flip the light switch off when you leave the room!

Plant a tree. Trees provide food and oxygen. They help save energy, clean the air, and help combat climate change.

Don't send chemicals into our waterways. Choose non-toxic chemicals in the home and office.

Discussion

8.	Number of electrons present in the unit charge
Answer» Answer: The amount of charge in 1 electron (elementary charge) is approximately 1.6×10−19 C, and 1 coulomb CORRESPONDS to the amount of charge for about 6.24×1018 electrons. The symbol Q is OFTEN used to denote a quantity of electricity or charge. *PLEASE* *MARK* AS *BRAINLIST* *AND* *FOLLOW* ME .

8.

Number of electrons present in the unit charge

Answer»

Answer:

The amount of charge in 1 electron (elementary charge) is approximately 1.6×10−19 C, and 1 coulomb CORRESPONDS to the amount of charge for about 6.24×1018 electrons. The symbol Q is OFTEN used to denote a quantity of electricity or charge.

PLEASE MARK AS BRAINLIST AND FOLLOW ME .

Discussion

9.	a particle is displaced 2i-3j+k to another position 3i+2j-2k under the action of the force 2i+j-k the workdone by tge force in arbitory unit is
Answer» Explanation: 5i-1i-k root of(25+1+1) =5.2 2i+J-k =root of (4+1+1) =2.4 W=DISPLACEMENT × FORCE in DIRECTION of displacement so W =2.4×5.2 =12.48 J

9.

a particle is displaced 2i-3j+k to another position 3i+2j-2k under the action of the force 2i+j-k the workdone by tge force in arbitory unit is

Answer»

Explanation:

5i-1i-k

root of(25+1+1)

=5.2

2i+J-k

=root of (4+1+1)

=2.4

W=DISPLACEMENT × FORCE in DIRECTION of displacement

so W =2.4×5.2

=12.48 J

Discussion

10.	3. Explain why water stored in a dam has potential energy
Answer» Answer: The WATER HELD behind the dam has potential ENERGY because of its position. ... The potential energy in the stored water changes into kinetic energy when the water moves through the tunnel. The kinetic energy of the moving water TURNS turbines within the dam.

10.

3. Explain why water stored in a dam has potential energy

Answer»

Answer:

The WATER HELD behind the dam has potential ENERGY because of its position. ... The potential energy in the stored water changes into kinetic energy when the water moves through the tunnel. The kinetic energy of the moving water TURNS turbines within the dam.

Discussion

11.	given three equal resistors how many combinations of this resistance are possible a) 3 b) 4 c ) 5 d) 6
Answer» ANSWER: B) 4 Explanation: I am not SURE about that answer

11.

given three equal resistors how many combinations of this resistance are possible a) 3 b) 4 c ) 5 d) 6

Answer»

ANSWER:

B) 4

Explanation:

I am not SURE about that answer

Discussion

12.	what is the frictional force produced by the road of a force of 20 N is given to block of mass 2 kgbproduces an acceleration of 5 ms
Answer» Answer: FRICTIONAL force produced by the road = 10N Explanation: ACCORDING to Newton's 2nd LAW of motion, UNBALANCED forces = ma Where m=mass of the body And a=accelration So here, unbalanced force is external force,F - frictional force,f = ma 20 - f = ma 20 - 2*10 = f Therefore, f =10N

12.

what is the frictional force produced by the road of a force of 20 N is given to block of mass 2 kgbproduces an acceleration of 5 ms

Answer»

Answer:

FRICTIONAL force produced by the road = 10N

Explanation:

ACCORDING to Newton's 2nd LAW of motion,

UNBALANCED forces = ma

Where m=mass of the body

And a=accelration

So here, unbalanced force is external force,F - frictional force,f = ma

20 - f = ma

20 - 2*10 = f

Therefore, f =10N

Discussion

13.	Explain how can you measure frictional force?
Answer» Answer: The force of friction occurs when one not IDEALLY smooth object slides against another one. This force always directed against the movement and, in absence of other forces, slows down the sliding. The force of friction depends, MAINLY, on two factors: material the OBJECTS are made of (more or less smooth) and how tightly they are pushed against each other. Typical textbook problem in physics is to determine the force of friction when one object (say, a wooden block) slides horizontally across some SURFACE (like a table) and it's pushed against this surface by its weight (force of gravity). A variation is a SIMILAR problem, but the surface is not horizontal, but is a slope of some angle. While the measure of how tightly the objects are pushed against each other is easily measured using the pressure force, the factor of material objects are made of is not so easily accounted for. For this physicists are using the coefficient of friction, which measures the force of friction between two objects made of certain materials per unit of pressure. It's determined experimentally.

13.

Explain how can you measure frictional force?

Answer»

Answer:

The force of friction occurs when one not IDEALLY smooth object slides against another one. This force always directed against the movement and, in absence of other forces, slows down the sliding.

The force of friction depends, MAINLY, on two factors: material the OBJECTS are made of (more or less smooth) and how tightly they are pushed against each other. Typical textbook problem in physics is to determine the force of friction when one object (say, a wooden block) slides horizontally across some SURFACE (like a table) and it's pushed against this surface by its weight (force of gravity). A variation is a SIMILAR problem, but the surface is not horizontal, but is a slope of some angle.

While the measure of how tightly the objects are pushed against each other is easily measured using the pressure force, the factor of material objects are made of is not so easily accounted for. For this physicists are using the coefficient of friction, which measures the force of friction between two objects made of certain materials per unit of pressure. It's determined experimentally.

Discussion

14.	A passenger train is brought to rest by suddenly applying brakes.Which compartment will come to rest first?
Answer» ANSWER: first or LAST MAY be come in first REST position

14.

A passenger train is brought to rest by suddenly applying brakes.Which compartment will come to rest first?

Answer»

ANSWER:

first or LAST MAY be come in first REST position

Discussion

15.	For a progressive wave is the usal rotation
Answer» Answer: Progressive Wave. A progressive wave is defined as the onward transmission of the vibratory MOTION of a body in an elastic medium from one PARTICLE to the SUCCESSIVE particle.

15.

For a progressive wave is the usal rotation

Answer»

Answer:

Progressive Wave. A progressive wave is defined as the onward transmission of the vibratory MOTION of a body in an elastic medium from one PARTICLE to the SUCCESSIVE particle.

Discussion

16.	Write your suggestions about reducing sound pollution
Answer» ANSWER: STOP USING DJ on weddings and any occations . stop FIRE crackering on FESTIVALS .

16.

Write your suggestions about reducing sound pollution

Answer»

ANSWER:

STOP USING DJ on weddings and any occations .

stop FIRE crackering on FESTIVALS .

Discussion

17.	if an object is projected from surface of earth with speed v=√6gR then interstellar speed of object
Answer» Answer: 2√gR. Explanation: For getting a velocity in the interstellar, the body when escapes the earth's ORBIT with the escape velocity which is √(2gR). Where R is the radius of the earth and G is the acceleration due to gravity. So, the interstellar velocity will be v^2=vc^2 - ve^2 where the vc is the ORBITAL velocity which is GIVEN in the question as √(6gR). So, on substituting the values we will get the interstellar velocity of the body when escapes the earth's surface. v=√[6gR - 2gR] which on SOLVING we will get that the velocity will be 2√gR.

17.

if an object is projected from surface of earth with speed v=√6gR then interstellar speed of object

Answer»

Answer:

2√gR.

Explanation:

For getting a velocity in the interstellar, the body when escapes the earth's ORBIT with the escape velocity which is √(2gR). Where R is the radius of the earth and G is the acceleration due to gravity.

So, the interstellar velocity will be v^2=vc^2 - ve^2 where the vc is the ORBITAL velocity which is GIVEN in the question as √(6gR). So, on substituting the values we will get the interstellar velocity of the body when escapes the earth's surface. v=√[6gR - 2gR] which on SOLVING we will get that the velocity will be 2√gR.

Discussion

18.	The sound intensity level of the threshould frequency of hearing is
Answer» Answer: 1000 HZ is the sound intensity level of the threshold FREQUENCY of HEARING

18.

The sound intensity level of the threshould frequency of hearing is

Answer»

Answer:

1000 HZ is the sound intensity level of the threshold FREQUENCY of HEARING

Discussion

19.	How does time travel from past to present then to future and come back to present
Answer» ANSWER: to get this answer go to the movie of AVENGERS RND GAME

19.

How does time travel from past to present then to future and come back to present

Answer»

ANSWER:

to get this answer go to the movie of

AVENGERS RND GAME

Discussion

20.	Short note on horticulture
Answer» Answer: HORTICULTURE has been defined as the CULTURE of plants, mainly for food, MATERIALS, comfort and BEAUTY. According to American horticulturist Liberty HYDE Bailey, "Horticulture is the growing of flowers, fruits and vegetables, and of plants for ornament mark me in brainliest please please please please please please please please please please please please please please please please please

20.

Short note on horticulture

Answer»

Answer:

HORTICULTURE has been defined as the CULTURE of plants, mainly for food, MATERIALS, comfort and BEAUTY. According to American horticulturist Liberty HYDE Bailey, "Horticulture is the growing of flowers, fruits and vegetables, and of plants for ornament

mark me in brainliest please please please please please please please please please please please please please please please please please

Discussion

21.	Why adults age people's are using Goggles
Answer» Answer: Hey mate here's your answer.... *Adults* *age* *people* *use* *goggles* *because* *they* *have* *Presbyopia. They* *use* *bi-focal* *LENSES* *i.e,* *convex* *and* *CONCAVE* *lens* so *that* *they* *can* *CLEARLY* *see* *through* *their* *eyes. Normally* *the* *upper* *portion* *CONSISTS* of a *concave* *lens* *which* *facilitates* *distance* *vision* *while* *lower* *part* is a *convex* *lens* *which* *facilitates* *near* *vision. Hope* *this* *helps* *you.... Thanking* *you* *Yours* *sincerely* *Jalay*

21.

Why adults age people's are using Goggles

Answer»

Answer:

Hey mate here's your answer....

Adults age people use goggles because they have Presbyopia.
They use bi-focal LENSES i.e, convex and CONCAVE lens so that they can CLEARLY see through their eyes.
Normally the upper portion CONSISTS of a concave lens which facilitates distance vision while lower part is a convex lens which facilitates near vision.

Hope this helps you....

Thanking you

Yours sincerely

Jalay

Discussion

22.	. A block of mass 2 kg is pushed against a rough verticalwall with a force of 40 N, coefficient of static frictionbeing 0:5. Another horizontal force of 15 N, is appliedon the block in a direction parallel to the wall. Will theblock move ? If yes, in which direction ? If no, find thefrictional force exerted by the wall on the block.
Answer» Answer: Explanation: Net FORCE = *(202 + (15)2 – (0.5) × 40 = 25 – 20 = 5N  tan  = 20/15 = 4/3   = tan–1(4/3) = 53° So, the BLOCK will MOVE at an angle 53 ° with an 15N force

22.

. A block of mass 2 kg is pushed against a rough verticalwall with a force of 40 N, coefficient of static frictionbeing 0:5. Another horizontal force of 15 N, is appliedon the block in a direction parallel to the wall. Will theblock move ? If yes, in which direction ? If no, find thefrictional force exerted by the wall on the block.

Answer»

Answer:

Explanation:

Net FORCE = *(202 + (15)2 – (0.5) × 40 = 25 – 20 = 5N

 tan  = 20/15 = 4/3   = tan–1(4/3) = 53°

So, the BLOCK will MOVE at an angle 53 ° with an 15N force

Discussion

23.	Give example to show friction as friend in foe
Answer» Answer: examples to show that friction is a friend and a foe: Friction is friend: (i) Friction allows us to grip and catch DIFFERENT objects. (ii) It helps us to walk comfortably on the surface. ... Friction is foe: (i) Friction causes WEAR and TEAR in objects. Explanation:

23.

Give example to show friction as friend in foe

Answer»

Answer:

examples to show that friction is a friend and a foe: Friction is friend: (i) Friction allows us to grip and catch DIFFERENT objects. (ii) It helps us to walk comfortably on the surface. ... Friction is foe: (i) Friction causes WEAR and TEAR in objects.

Explanation:

Discussion

24.	State the lenz's law. show the lens law follows from principle of conservation of energy.
Answer» Answer: LENZ's law, named after the physicist Emil Lenz who formulated it in 1834, states that the direction of the current induced in a CONDUCTOR by a changing magnetic field is such that the magnetic field created by the induced current opposes the initial changing magnetic field. Lenz's Law is consistent with the Principle of CONSERVATION of Energy because when a magnet with N-pole facing coil is pushed toward (or pulled away from) the coil, there is a increase (or decrease) in magnetic flux linkage, RESULTING in an induced current FLOWING in the cell, according to Faraday'sLaw.

24.

State the lenz's law. show the lens law follows from principle of conservation of energy.

Answer»

Answer:

LENZ's law, named after the physicist Emil Lenz who formulated it in 1834, states that the direction of the current induced in a CONDUCTOR by a changing magnetic field is such that the magnetic field created by the induced current opposes the initial changing magnetic field.

Lenz's Law is consistent with the Principle of CONSERVATION of Energy because when a magnet with N-pole facing coil is pushed toward (or pulled away from) the coil, there is a increase (or decrease) in magnetic flux linkage, RESULTING in an induced current FLOWING in the cell, according to Faraday'sLaw.

Discussion

25.	A pushing force of 50 N acts on a blockat an angle of 30°with horizontal. The respective horizontal and vertical components. of force will be
Answer» ANSWER: the RESPECTIVE HORIZONTAL and VERTICAL

25.

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

Answer»

ANSWER:

the RESPECTIVE HORIZONTAL and VERTICAL

Discussion

26.	A Car starts from rest and accelerates uniformly at 2m/s2 for 10 sec. What is the velocity at the end of 10 sec.
Answer» Answer: 20 m/s Explanation: Use EQUATION of motion v = u + at = 0 m/s + (2 m/s² × 10 s) = 20 m/s

26.

A Car starts from rest and accelerates uniformly at 2m/s2 for 10 sec. What is the velocity at the end of 10 sec.

Answer»

Answer:

20 m/s

Explanation:

Use EQUATION of motion

v = u + at

= 0 m/s + (2 m/s² × 10 s)

= 20 m/s

Discussion

27.	What is the condition for equilibrium of a particle
Answer» Answer: ❤️❤️The EQUILIBRIUM of FORCES is the state in which the forces applied on a body are in balance. NEWTON's first LAW states that if the resultant force acting on a particle (the simplest body) is zero, the particle will remain at rest or will move with constant velocity.❤️❤️ Explanation: ❤️❤️hello DEAR here is your answer mark it brainlist ok and follow me... :) ☺️☺️❤️❤️

27.

What is the condition for equilibrium of a particle

Answer»

Answer:

❤️❤️The EQUILIBRIUM of FORCES is the state in which the forces applied on a body are in balance. NEWTON's first LAW states that if the resultant force acting on a particle (the simplest body) is zero, the particle will remain at rest or will move with constant velocity.❤️❤️

Explanation:

❤️❤️hello DEAR here is your answer mark it brainlist ok and follow me... :) ☺️☺️❤️❤️

Discussion

28.	Write two slogans to reduce sound pollution
Answer» Answer: Explanation: ○Stop noise pollution before it stops your hearing capacity. ○Don't PUT your EARS at risk, keep quiet. ○Noise can MAKE you deaf, keep the noise down. ○Reduce noise pollution before it reduces the hearing capacity. ○Silence is good, MAINTAIN the silence.

28.

Write two slogans to reduce sound pollution

Answer»

Answer:

Explanation:

○Stop noise pollution before it stops your hearing capacity.

○Don't PUT your EARS at risk, keep quiet.

○Noise can MAKE you deaf, keep the noise down.

○Reduce noise pollution before it reduces the hearing capacity.

○Silence is good, MAINTAIN the silence.

Discussion

29.	a particle of mass 2 kg moves on a circular path with constant speed of 10m/s find change magnitude of velocity when particle completes half of its revolution?
Answer» EXPLANATION: CHANGE in VELOCITY= 20m/s

29.

a particle of mass 2 kg moves on a circular path with constant speed of 10m/s find change magnitude of velocity when particle completes half of its revolution?

Answer»

EXPLANATION:

CHANGE in VELOCITY= 20m/s

Discussion

30.	What is the direction of velocity vector of a particle in uniform circular motion
Answer» ANSWER: if the PARTICLE is MOVING on UNIFORM circilar MOTION then its tengent

30.

What is the direction of velocity vector of a particle in uniform circular motion

Answer»

ANSWER:

if the PARTICLE is MOVING on UNIFORM circilar MOTION then its tengent

Discussion

31.	The Q factor of damped and forced oscillator is 25 and its relaxation time is 50s.what is the natural frequency of the oscillator? A.4Hz B.2Hz C.1Hz D.0.5Hz
Answer» ANSWER: SORRY BRO I did not LEARN this yet Explanation:

31.

The Q factor of damped and forced oscillator is 25 and its relaxation time is 50s.what is the natural frequency of the oscillator? A.4Hz B.2Hz C.1Hz D.0.5Hz

Answer»

ANSWER:

SORRY BRO I did not LEARN this yet

Explanation:

Discussion

32.	Is commutative law applicable for vector addition
Answer» Explanation: No commutative LAW is valid in dot product and not ALLOW in CROSS products Hope this will HELP u Mark as brainly Follow me

32.

Is commutative law applicable for vector addition

Answer»

Explanation:

No commutative LAW is valid in dot product and not ALLOW in CROSS products

Hope this will HELP u

Mark as brainly

Follow me

Discussion

33.	Find the following dx (3)Y=x
Answer» 3 hope it HELPS you!! THANK you!!! have a GREAT DAY AHEAD!!!:-)

33.

Find the following dx (3)Y=x

Answer»

3

hope it HELPS you!!

THANK you!!!

have a GREAT DAY AHEAD!!!:-)

Discussion

34.	How does sound pollution effect BIO DIVERSITY?
Answer» Answer: Effects of NOISE Pollution. Noise pollution or EXCESSIVE noise can be described as any kind of unwantedsounds, which have an adverse effecton human BEINGS, animals and PLANTS. ... Excessive noise leads to EVEN loss of hearing. In fact, noise pollution is an integral part of the industrial environment.

34.

How does sound pollution effect BIO DIVERSITY?

Answer»

Answer:

Effects of NOISE Pollution. Noise pollution or EXCESSIVE noise can be described as any kind of unwantedsounds, which have an adverse effecton human BEINGS, animals and PLANTS. ... Excessive noise leads to EVEN loss of hearing. In fact, noise pollution is an integral part of the industrial environment.

Discussion

35.	Explain the physical properties of metals with suitable example
Answer» EXPLANATION: okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

35.

Explain the physical properties of metals with suitable example

Answer»

EXPLANATION:

okkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

Discussion

36.	Solubility of salt in water _____on heating the solution
Answer» ANSWER: Increases Explanation:

36.

Solubility of salt in water _____on heating the solution

Answer»

ANSWER:

Increases

Explanation:

Discussion

37.	Two bodies of mass 2kg and 3 kg are moving in same direction withvelocities 2 m/s and 5 m/s raspectively find velocity after collision.
Answer» EXPLANATION: VF = M1V1/(m1+m2) =2×2(2+3) 4/5

37.

Two bodies of mass 2kg and 3 kg are moving in same direction withvelocities 2 m/s and 5 m/s raspectively find velocity after collision.

Answer»

EXPLANATION:

VF = M1V1/(m1+m2)

=2×2(2+3)

4/5

Discussion

38.	A force of 5 N produces an acceleration of8 m/s on a mass m, and an acceleration of24 m/s on a mass m2. Find the accelerationthat the same force would provide if boththe masses are tied together.
Answer» Explanation: for first mass m1, F=5N. a= 8m/s² since F=ma =>5=m1X8 =>m=5/8kg for second mass m2, F=5N. a= 24m/s² m2= 5/24kg when both MASSES are TIED TOGETHER, that NEW mass will be m1+m2=5/8+5/24 =20/24=5/6kg F=5N. m=5/6kg F=ma =>5=5/6 X a => a=6m/s²

38.

A force of 5 N produces an acceleration of8 m/s on a mass m, and an acceleration of24 m/s on a mass m2. Find the accelerationthat the same force would provide if boththe masses are tied together.

Answer»

Explanation:

for first mass m1, F=5N. a= 8m/s²

since F=ma =>5=m1X8 =>m=5/8kg

for second mass m2, F=5N. a= 24m/s²

m2= 5/24kg

when both MASSES are TIED TOGETHER, that NEW mass will be m1+m2=5/8+5/24

=20/24=5/6kg

F=5N. m=5/6kg

F=ma =>5=5/6 X a => a=6m/s²

Discussion

39.	How can you explain the sound has energy????
Answer» here is your answer. answer: sound is MOVEMENT of ENERGY through substances in longitudinal waves .sound is produced when a force cause an object and substances to vibrate . the energy is TRANSFERRED through the substances in wave . typically ,the energy is sound is FAR less than other form of energy .......... PLS mark as brainliest.

39.

How can you explain the sound has energy????

Answer»

here is your answer.

answer:

sound is MOVEMENT of ENERGY through substances in longitudinal waves .sound is produced when a force cause an object and substances to vibrate . the energy is TRANSFERRED through the substances in wave . typically ,the energy is sound is FAR less than other form of energy ..........

PLS mark as brainliest.

Discussion

40.	______and______can be used for separating insoluble solids from liquid
Answer» ANSWER: FILTRATION sedimentation Explanation:

40.

andcan be used for separating insoluble solids from liquid

Answer»

ANSWER:

FILTRATION sedimentation

Explanation:

Discussion

41.	Give examples where heat energy gets converted into other forms of energy and vice versa
Answer» Answer: Hydroelectric POWER plants Explanation: WATER is converted into thermal ENERGY by which the TURBINE rotates. therefore energy is transformed.

41.

Give examples where heat energy gets converted into other forms of energy and vice versa

Answer»

Answer:

Hydroelectric POWER plants

Explanation:

WATER is converted into thermal ENERGY by which the TURBINE rotates. therefore energy is transformed.

Discussion

42.	9. A body moving along straight line covers a distancein three equal parts with speed 2 m/s, 3 m/s and4 m/s, then its average speed is(1) 12 m/s
Answer» ANSWER: (3X +40)+(x-20)=180 3x+40+ x-20=180 4x+20=180 4x=180-20 x=160/4=40

42.

9. A body moving along straight line covers a distancein three equal parts with speed 2 m/s, 3 m/s and4 m/s, then its average speed is(1) 12 m/s

Answer»

ANSWER:

(3X +40)+(x-20)=180

3x+40+ x-20=180

4x+20=180

4x=180-20

x=160/4=40

Discussion

43.	8. Calculate the density of solid from the followingdata :(a) Mass of solid = 72 g(b)Initial volume of water in measuring cylinder= 24 mL. c)final volume of water when solid is completely immersed in water=42ml
Answer» ANSWER: answer is 4 units hope this HELPS you please mark me as the BRAINLIEST

43.

8. Calculate the density of solid from the followingdata :(a) Mass of solid = 72 g(b)Initial volume of water in measuring cylinder= 24 mL. c)final volume of water when solid is completely immersed in water=42ml

Answer»

ANSWER:

answer is 4 units

hope this HELPS you

please mark me as the BRAINLIEST

Discussion

44.	What is meant by motion
Answer» ANSWER: MOVEMENT of an OBJECT is CALLED motion. Mark as BRAINLIEST

44.

What is meant by motion

Answer»

ANSWER:

MOVEMENT of an OBJECT is CALLED motion.

Mark as BRAINLIEST

Discussion

45.	Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m? Check all that apply. bass baritone tenor contralto soprano
Answer» ANSWER: i don't know mark my answer as BRANLIEST

45.

Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m? Check all that apply. bass baritone tenor contralto soprano

Answer»

ANSWER:

i don't know

mark my answer as BRANLIEST

Discussion

46.	Two bodies of massaes 2kg each or separated by 50 cm .what is force between them ?with brief answer please please follow me
Answer» ANSWER: There is an FORMULA for it that is F=Gm1×m2/R×R

46.

Two bodies of massaes 2kg each or separated by 50 cm .what is force between them ?with brief answer please please follow me

Answer»

ANSWER:

There is an FORMULA for it that is F=Gm1×m2/R×R

Discussion

47.	Hindi Information for neem tree
Answer» Answer: नीम एक तेजी से बढ़ने वाला पेड़ है जो 15-20 मीटर (49-66 फीट) की ऊंचाई तक पहुंच सकता है, और शायद ही कभी 35-40 मीटर (115–131 फीट)। यह सदाबहार है , लेकिन गंभीर सूखे में यह या इसके लगभग सभी पत्तों को बहा सकता है। शाखाएँ चौड़ी और फैली हुई हैं। काफी घना ताज गोल है और 20-25 मीटर (66-82 फीट) के व्यास तक पहुंच सकता है। नीम का पेड़ अपने रिश्तेदार, चिनाबेरी ( मेलिया अकरडैच ) की तुलना में बहुत समान है । [4] विपरीत, सुफ़ने पत्ते 20-40 3-8 सेंटीमीटर (1.2-3.1 में) लंबे समय के बारे में गहरे हरे रंग पत्रक सेंटीमीटर (7.9-15.7 में) लंबे, 20 से 30 मध्यम करने के लिए के साथ कर रहे हैं। टर्मिनल लीफलेट अक्सर गायब रहता है। डंठल कम कर रहे हैं। सफेद (और सुगंधित) फूलों को अधिक-या-कम ड्रोपिंग एक्सिलरी पैनल्स में व्यवस्थित किया जाता है जो 25 सेंटीमीटर (9.8 इंच) तक लंबे होते हैं। पुष्पक्रम , जो शाखा तीसरी डिग्री, 250 से 300 फूलों से भालू पर निर्भर है। एक व्यक्तिगत फूल 5-6 मिलीमीटर (0.20-0.24 इंच) लंबा और 8-11 मिलीमीटर (0.31–0.43 इंच) चौड़ा होता है। एक ही व्यक्ति के पेड़ पर सुरक्षात्मक , उभयलिंगी फूल और नर फूल मौजूद हैं। फल एक चिकनी (है अरोमिल ), जैतून की तरह DRUPE जो दीर्घ अंडाकार से लगभग गोल करने के लिए आकार में भिन्न होता है, और जब परिपक्व 1.4-2.8 1.0-1.5 सेंटीमीटर (0.39-0.59) द्वारा सेंटीमीटर (0.55-1.10 में) है। फलों की त्वचा (एक्सोकार्प) पतली और कड़वी-मीठी लुगदी (मेसोकार्प) पीली-सफेद और बहुत रेशेदार होती है। मेसोकार्प 0.3–0.5 सेंटीमीटर (0.12–0.20 इंच) मोटा होता है। फल का सफेद, कठोर आंतरिक आवरण (एंडोकार्प) भूरे रंग के बीज वाले एक , शायदनीम के पत्तों को भारत में सुखाया जाता है और कपड़ों को खाने वाले कीड़ों को रोकने के लिए अलमारी में रखा जाता है, और उन टिन्स में भी रखा जाता है जहाँ चावल जमा होते हैं। [११] इन फूलों का उपयोग कई भारतीय त्योहारों जैसे उगादी में भी किया जाता है । नीचे देखें: भारत में हिंदू त्योहारों के साथ #Association । एक के रूप में आयुर्वेदिक जड़ी बूटी, नीम भी स्नान में प्रयोग किया जाता है। ही कभी दो, या तीन, लम्बी बीज (गुठली) को घेरता है । Explanation: HOPE helpful answer... Mark bairlest answer....✌✌

47.

Hindi Information for neem tree

Answer»

Answer:

नीम एक तेजी से बढ़ने वाला पेड़ है जो 15-20 मीटर (49-66 फीट) की ऊंचाई तक पहुंच सकता है, और शायद ही कभी 35-40 मीटर (115–131 फीट)। यह सदाबहार है , लेकिन गंभीर सूखे में यह या इसके लगभग सभी पत्तों को बहा सकता है। शाखाएँ चौड़ी और फैली हुई हैं। काफी घना ताज गोल है और 20-25 मीटर (66-82 फीट) के व्यास तक पहुंच सकता है। नीम का पेड़ अपने रिश्तेदार, चिनाबेरी ( मेलिया अकरडैच ) की तुलना में बहुत समान है । [4]

विपरीत, सुफ़ने पत्ते 20-40 3-8 सेंटीमीटर (1.2-3.1 में) लंबे समय के बारे में गहरे हरे रंग पत्रक सेंटीमीटर (7.9-15.7 में) लंबे, 20 से 30 मध्यम करने के लिए के साथ कर रहे हैं। टर्मिनल लीफलेट अक्सर गायब रहता है। डंठल कम कर रहे हैं।

सफेद (और सुगंधित) फूलों को अधिक-या-कम ड्रोपिंग एक्सिलरी पैनल्स में व्यवस्थित किया जाता है जो 25 सेंटीमीटर (9.8 इंच) तक लंबे होते हैं। पुष्पक्रम , जो शाखा तीसरी डिग्री, 250 से 300 फूलों से भालू पर निर्भर है। एक व्यक्तिगत फूल 5-6 मिलीमीटर (0.20-0.24 इंच) लंबा और 8-11 मिलीमीटर (0.31–0.43 इंच) चौड़ा होता है। एक ही व्यक्ति के पेड़ पर सुरक्षात्मक , उभयलिंगी फूल और नर फूल मौजूद हैं।

फल एक चिकनी (है अरोमिल ), जैतून की तरह DRUPE जो दीर्घ अंडाकार से लगभग गोल करने के लिए आकार में भिन्न होता है, और जब परिपक्व 1.4-2.8 1.0-1.5 सेंटीमीटर (0.39-0.59) द्वारा सेंटीमीटर (0.55-1.10 में) है। फलों की त्वचा (एक्सोकार्प) पतली और कड़वी-मीठी लुगदी (मेसोकार्प) पीली-सफेद और बहुत रेशेदार होती है। मेसोकार्प 0.3–0.5 सेंटीमीटर (0.12–0.20 इंच) मोटा होता है। फल का सफेद, कठोर आंतरिक आवरण (एंडोकार्प) भूरे रंग के बीज वाले एक , शायदनीम के पत्तों को भारत में सुखाया जाता है और कपड़ों को खाने वाले कीड़ों को रोकने के लिए अलमारी में रखा जाता है, और उन टिन्स में भी रखा जाता है जहाँ चावल जमा होते हैं। [११] इन फूलों का उपयोग कई भारतीय त्योहारों जैसे उगादी में भी किया जाता है । नीचे देखें: भारत में हिंदू त्योहारों के साथ #Association । एक के रूप में आयुर्वेदिक जड़ी बूटी, नीम भी स्नान में प्रयोग किया जाता है। ही कभी दो, या तीन, लम्बी बीज (गुठली) को घेरता है ।

Explanation:

HOPE helpful answer...

Mark bairlest answer....✌✌

Discussion

48.	List out the objects made up of acrylic
Answer» EXPLANATION: The object that are made up of ACRYLIC are seats , sofas, SCULPTURE etc.

48.

List out the objects made up of acrylic

Answer»

EXPLANATION:

The object that are made up of ACRYLIC are seats , sofas, SCULPTURE etc.

Discussion

49.	Streching of spring is which type of change ?
Answer» Answer: If one were to stretch it BEYOND its elastic limit, there would be a PHYSICAL change in the metal however. An object is attached to a vertical spring and it is LOWERED to its equilibrium position. This stretches the spring by a LENGTH d.

49.

Streching of spring is which type of change ?

Answer»

Answer:

If one were to stretch it BEYOND its elastic limit, there would be a PHYSICAL change in the metal however. An object is attached to a vertical spring and it is LOWERED to its equilibrium position. This stretches the spring by a LENGTH d.

Discussion

50.	The initial velocity of a particle is x ms-1 (at t = 0)and acceleration a is function for time, given by,a = 6t. Which of the following relation is correct forfinal velocity y after time t?(1) y=x+ - (61)²(2) y=x² + (61)(3) y = x + 312(4) y = x + at
Answer» 3 OPTION i KNOW the ANSWER

50.

The initial velocity of a particle is x ms-1 (at t = 0)and acceleration a is function for time, given by,a = 6t. Which of the following relation is correct forfinal velocity y after time t?(1) y=x+ - (61)²(2) y=x² + (61)(3) y = x + 312(4) y = x + at

Answer»

3 OPTION

i KNOW the ANSWER

Discussion

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