67486 + Interview Questions in Secondary School in Physics

1.	Q-1) Two Capillary tubes of different daimeteedipped in water then the rise of water is
Answer» EXPLANATION: height OK FRIEND this is urs answer OK TAKE care BYE bye GOOD morning

1.

Q-1) Two Capillary tubes of different daimeteedipped in water then the rise of water is

Answer»

EXPLANATION:

height OK FRIEND this is urs answer OK TAKE care BYE bye GOOD morning

Discussion

2.	Define positive work, Negative work and zero work
Answer» ANSWER: the POSITIVE WORK and negative work are zero work because this at the FOLLOWING sentence are necessary depend on the positive and negative

2.

Define positive work, Negative work and zero work

Answer»

ANSWER:

the POSITIVE WORK and negative work are zero work because this at the FOLLOWING sentence are necessary depend on the positive and negative

Discussion

3.	For the maximum force on a current carrying conductor the angel between the direction of the current and the direction of the magnetic field is _______ degree.a) 0b) 90c) 180d) for any angle the force is same
Answer» Explanation: thethe maximum force on a current carrying conductor the angle between the DIRECTION of the current one direction of the MAGNETIC field is 90 DEGREE

3.

For the maximum force on a current carrying conductor the angel between the direction of the current and the direction of the magnetic field is _______ degree.a) 0b) 90c) 180d) for any angle the force is same

Answer»

Explanation:

thethe maximum force on a current carrying conductor the angle between the DIRECTION of the current one direction of the MAGNETIC field is 90 DEGREE

Discussion

4.	A body is dropped from height 3H ....So what is the ratio of time it will take equal height H? Pls help me.... a:b:c so what is the value of a,b and c
Answer» ANSWER: CENTRE of mass of an object is the point of 8 WEEK we can think of the followers of the object to be concentrated the mass of mass of an object TAMASHA OPEN off duty

4.

A body is dropped from height 3H ....So what is the ratio of time it will take equal height H? Pls help me.... a:b:c so what is the value of a,b and c

Answer»

ANSWER:

CENTRE of mass of an object is the point of 8 WEEK we can think of the followers of the object to be concentrated the mass of mass of an object TAMASHA OPEN off duty

Discussion

5.	A piece of brass of volume 30cm3 has a mass of 252g.find the density of brass in g cm-3 and kg m-3 pls pls tell me the answer
Answer» GIVEN : $\dag\: \sf\ Volume of brass :- 30cm^3$ $\dag\: \sf\ Mass of brass :- 252 g$ To FIND : $\sf\ Density \:of\:brass\: in\: g/cm^3 and kg/m^3.$ Solution : $\sf\ We\:are\:asked\:to\:find\:density:$ (a) g/cm^3 $\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$ $\dashrightarrow\: \sf\ D = M/V$ $\dashrightarrow\: \sf\ D = 252/30g/cm^3$ $\dashrightarrow\: \sf\ D = 25.2/3g/cm^3$ $\dashrightarrow\: \underline{\boxed{\tt{ D = 8.4g/cm^3}}}$ (B) kg/m^3 $\sf\ We\: convert\: the \:volume\:cubic\: metres.$ $\dashrightarrow\: \sf\ 1m^3=1000000cm^3$ $\dashrightarrow\: \sf\ 30/1000000\times1=0.00003m^3$ $\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$ Substituting we have: $\dashrightarrow\: \sf\ 0.252/0.00003$ $\dashrightarrow\: \underline{\boxed{\tt{8400kg/m^3}}}$ $\rule{180}3$

5.

A piece of brass of volume 30cm3 has a mass of 252g.find the density of brass in g cm-3 and kg m-3 pls pls tell me the answer

Answer»

GIVEN :

$\dag\: \sf\ Volume of brass :- 30cm^3$

$\dag\: \sf\ Mass of brass :- 252 g$

To FIND :

$\sf\ Density \:of\:brass\: in\: g/cm^3 and kg/m^3.$

Solution :

$\sf\ We\:are\:asked\:to\:find\:density:$

(a) g/cm^3

$\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$

$\dashrightarrow\: \sf\ D = M/V$

$\dashrightarrow\: \sf\ D = 252/30g/cm^3$

$\dashrightarrow\: \sf\ D = 25.2/3g/cm^3$

$\dashrightarrow\: \underline{\boxed{\tt{ D = 8.4g/cm^3}}}$

(B) kg/m^3

$\sf\ We\: convert\: the \:volume\:cubic\: metres.$

$\dashrightarrow\: \sf\ 1m^3=1000000cm^3$

$\dashrightarrow\: \sf\ 30/1000000\times1=0.00003m^3$

$\underline{\boxed{\tt{Density:- \frac{Mass}{Volume}.}}}$

Substituting we have:

$\dashrightarrow\: \sf\ 0.252/0.00003$

$\dashrightarrow\: \underline{\boxed{\tt{8400kg/m^3}}}$

$\rule{180}3$

Discussion

6.	The relation between time t and distance x is x = at2+bt3+c, where a and b are constants. The acceleration at t = 2 s.
Answer» Given : ➳ Relation b/w time and distance has been provided. $\bigstar\:\underline{\boxed{\tt{x=at^2+bt^3+c}}}$ To Find : ➨ Acc. at t = 2 s Solution : ✭ Instantaneous velocity : $\dashrightarrow\tt\:v=\dfrac{dx}{dt}\\ \\ \dashrightarrow\tt\:v=\dfrac{d(at^2+bt^3+c)}{dt}\\ \\ \dashrightarrow\tt\:v=2at+3bt^2+0\\ \\ \dashrightarrow\bf\:v=2at+3bt^2$ ✭ Instantaneous ACCELERATION : $\longrightarrow\tt\:a=\dfrac{dv}{dt}\\ \\ \longrightarrow\tt\:a=\dfrac{d(2at+3bt^2)}{dt}\\ \\ \longrightarrow\bf\:a=2a+6bt$ PUTTING t = 2, we GET $\longrightarrow\tt\:a=2a+6b(2)\\ \\ \longrightarrow\underline{\boxed{\bf{a=2(a+6b)}}}$

6.

The relation between time t and distance x is x = at2+bt3+c, where a and b are constants. The acceleration at t = 2 s.

Answer»

Given :

➳ Relation b/w time and distance has been provided.

$\bigstar\:\underline{\boxed{\tt{x=at^2+bt^3+c}}}$

To Find :

➨ Acc. at t = 2 s

Solution :

✭ Instantaneous velocity :

$\dashrightarrow\tt\:v=\dfrac{dx}{dt}\\ \\ \dashrightarrow\tt\:v=\dfrac{d(at^2+bt^3+c)}{dt}\\ \\ \dashrightarrow\tt\:v=2at+3bt^2+0\\ \\ \dashrightarrow\bf\:v=2at+3bt^2$

✭ Instantaneous ACCELERATION :

$\longrightarrow\tt\:a=\dfrac{dv}{dt}\\ \\ \longrightarrow\tt\:a=\dfrac{d(2at+3bt^2)}{dt}\\ \\ \longrightarrow\bf\:a=2a+6bt$

PUTTING t = 2, we GET

$\longrightarrow\tt\:a=2a+6b(2)\\ \\ \longrightarrow\underline{\boxed{\bf{a=2(a+6b)}}}$

Discussion

7.	What is the value of epsilon not
Answer» ANSWER: 8.854187817 X 10^-12. HEY MATE here is my answer

7.

What is the value of epsilon not

Answer»

ANSWER:

8.854187817 X 10^-12.

HEY MATE here is my answer

Discussion

8.	a piece of wire of resistance 20 ohm is drawn out so that to twice and area is reduced half of its original value calculate the resistance and resistivity
Answer» Answer: RESISTANCE: 80 RESISTIVITY always be half: 40

8.

a piece of wire of resistance 20 ohm is drawn out so that to twice and area is reduced half of its original value calculate the resistance and resistivity

Answer»

Answer:

RESISTANCE: 80

RESISTIVITY always be half: 40

Discussion

9.	From a car moving on a horizontal road a body is dropped, what is the direction of its initial velocity?
Answer» ANSWER: OPPOSITE direction. Explanation: If a body is DROPPED from a moving CAR it will go to opposite side. Mark my answer as BRAIN list answer

9.

From a car moving on a horizontal road a body is dropped, what is the direction of its initial velocity?

Answer»

ANSWER:

OPPOSITE direction.

Explanation:

If a body is DROPPED from a moving CAR it will go to opposite side.

Mark my answer as BRAIN list answer

Discussion

10.	The velocity of a car is 18 m s-1. Express thisvelocity in km h-1.
Answer» EXPLANATION: the answer will be 5 OK BYE FRIEND

10.

The velocity of a car is 18 m s-1. Express thisvelocity in km h-1.

Answer»

EXPLANATION:

the answer will be 5 OK BYE FRIEND

Discussion

11.	তড়িৎ ক্ষেত্রপ্রাবল্যের অভিমুখ নির্দেশ কর।p দ্বিমেরু ভ্ৰামক সম্পন্ন একটি তড়িৎ দ্বিমেরুকে E প্রাবল্যের তড়িৎ ক্ষেত্রের অভিমুখের সঙ্গে x কোনে ঘােরাতে কি পরিমানকার্য করতে হবে নির্ণয় কর?d০) তডি০ ডিমের নামেGo=
Answer» ANSWER: ifeqpjeqx mgqzkvffjfhlsm xjdul

11.

তড়িৎ ক্ষেত্রপ্রাবল্যের অভিমুখ নির্দেশ কর।p দ্বিমেরু ভ্ৰামক সম্পন্ন একটি তড়িৎ দ্বিমেরুকে E প্রাবল্যের তড়িৎ ক্ষেত্রের অভিমুখের সঙ্গে x কোনে ঘােরাতে কি পরিমানকার্য করতে হবে নির্ণয় কর?d০) তডি০ ডিমের নামেGo=

Answer»

ANSWER:

ifeqpjeqx mgqzkvffjfhlsm xjdul

Discussion

12.	Why the fire so hot when we try to touch it
Answer» Fire is hot because thermal energy (heat) is released when chemical bonds are broken and formed during a COMBUSTION REACTION. Combustion turns FUEL and oxygen into carbon DIOXIDE and water. ... Both light and heat are released as energy Mark me BRAINLIEST and follow me

12.

Why the fire so hot when we try to touch it

Answer»

Fire is hot because thermal energy (heat) is released when chemical bonds are broken and formed during a COMBUSTION REACTION. Combustion turns FUEL and oxygen into carbon DIOXIDE and water. ... Both light and heat are released as energy

Mark me BRAINLIEST and follow me

Discussion

13.	An auto travels the first half time with a uniform speed u and the next half time with a uniform speed v. Find it's average speed.
Answer» Answer: 0 at REST EXPLANATION:

13.

An auto travels the first half time with a uniform speed u and the next half time with a uniform speed v. Find it's average speed.

Answer»

Answer:

0 at REST

EXPLANATION:

Discussion

14.	Sketch of feild lines associated with two separated point charges +q and -2q
Answer» Explanation: At any point the DIRECTION of electric field due to CHARGE Q is away from Q and due to −4Q will be towards the −4Q. So the REQUIRED point should not be between two charges. As ∣Q∣<∣−4Q∣ the point of zero electric field should be NEARER to Q, to cancel the electric field due to −4Q. Out of the given options, A fits the above CRITERIA.

14.

Sketch of feild lines associated with two separated point charges +q and -2q

Answer»

Explanation:

At any point the DIRECTION of electric field due to CHARGE Q is away from Q and due to −4Q will be towards the −4Q. So the REQUIRED point should not be between two charges.

As ∣Q∣<∣−4Q∣ the point of zero electric field should be NEARER to Q, to cancel the electric field due to −4Q. Out of the given options, A fits the above CRITERIA.

Discussion

15.	CBSE CLASS 9 PHYSICS MOTION AND LAWS OF MOTION ALLL FORMULAS PLS ITS URGENT NO SPAM
Answer» ANSWER: first v - U = at second s= UT + 1/2 at^2 third v^2 - u^2 = 2AS

15.

CBSE CLASS 9 PHYSICS MOTION AND LAWS OF MOTION ALLL FORMULAS PLS ITS URGENT NO SPAM

Answer»

ANSWER:

first

v - U = at

second

s= UT + 1/2 at^2

third

v^2 - u^2 = 2AS

Discussion

16.	Why is fuseis wire always in alive cercuit ?
Answer» Answer: *Hlo* *mate* The fuse wire is ALWAYS CONNECTED in the live wire of the circuit because if the fuse is put in the neutral wire, then due to excessive flow of current when the fuse burns, current STOPS flowing in the circuit, but the appliance remains connected to the high potential point of the supply through the live wire. *Hope* *it's* *helpful* *DEAR*

16.

Why is fuseis wire always in alive cercuit ?

Answer»

Answer:

Hlo mate

The fuse wire is ALWAYS CONNECTED in the live wire of the circuit because if the fuse is put in the neutral wire, then due to excessive flow of current when the fuse burns, current STOPS flowing in the circuit, but the appliance remains connected to the high potential point of the supply through the live wire.

Hope it's helpful DEAR

Discussion

17.	plzzzzzzzzzzzzzzzzzzz answer me If you apply aa net force of 3N on o. 1kg-100x what is the accelartion of 100x
Answer» Answer: SUKH KITHE aan tainu EK gll daani SE lifeline ❤️ JLDI aao online

17.

plzzzzzzzzzzzzzzzzzzz answer me If you apply aa net force of 3N on o. 1kg-100x what is the accelartion of 100x

Answer»

Answer:

SUKH KITHE aan

tainu EK gll daani SE lifeline ❤️ JLDI aao online

Discussion

18.	A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m (can u say the formula)
Answer» $\text{[math]}$ 6xyz/5 -2xyz/3 +7xyz/9 is EQUAL to: * 2 points -51xyz/45 xyz xyz/45 59xyz/45 hope it HELPS you ❤️✌️

18.

A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m (can u say the formula)

Answer»

$\text{[math]}$

6xyz/5 -2xyz/3 +7xyz/9 is EQUAL to: *

2 points

-51xyz/45

xyz

xyz/45

59xyz/45

hope it HELPS you ❤️✌️

Discussion

19.	ਹੇਠ ਵਲਖੀਆਂ ਵਿਿੱਚੋਂ ਵਕਹੜਾ ਤਰੀਕਾ ਫੁਰਤੀ ਿਧਾਉਣ ਲਈ ਸਹੀ ਨਹੀਂ ਹੈ
Answer» ANSWER: I m not ABLE to UNDERSTAND this LANGUAGE

19.

ਹੇਠ ਵਲਖੀਆਂ ਵਿਿੱਚੋਂ ਵਕਹੜਾ ਤਰੀਕਾ ਫੁਰਤੀ ਿਧਾਉਣ ਲਈ ਸਹੀ ਨਹੀਂ ਹੈ

Answer»

ANSWER:

I m not ABLE to UNDERSTAND this LANGUAGE

Discussion

20.	A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m. (Can u say the formula).
Answer» ANSWER: the FORMULA will be MMM

20.

A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m. (Can u say the formula).

Answer»

ANSWER:

the FORMULA will be MMM

Discussion

21.	Why Chinese kept and guarded silk fibre secretly?
Answer» <STRONG>Answer: Do you love Chinese silk? This wondrous natural material was the imperial dynasties' #1 export item for many centuries, and it is STILL a hot item wherever the silky material goes. Shiny, lustrous, soft yet strong, it can be beautifully and brilliantly dyed. The history of Chinese silk stretches back more than 2,000 years, and here is how silk is MADE and where to shop for modern products. China Is the World's Foremost Silk Producer China produces about 150,000 metric tons annually. This is much more than the REST of the world combined producing 78% of the world's silk. Only India has a comparably large industry that produces about 30,000 metric tons. Top Modern Silk Producing Regions Silk is mainly produced in the south of the Yangtze River Delta. Renowned silk producing regions are Jiangsu, Zhejiang and Sichuan provinces. Cities such as Suzhou, Hangzhou, Nanjing, and Shaoxing are well known for their silk industries. History of Silk Imperial era Chinese clothingImperial era Chinese clothing The people living in the region were the inventors of silk fabric, and no other culture discovered this process independently. The history of silk making stretches back 6,000 years, and the earliest example of silk fabric that has been discovered dates from 3,630 BC in Henan. Silk cloth manufacture was well advanced during the Shang Dynasty (1600-1046 BC) era. Explanation:

21.

Why Chinese kept and guarded silk fibre secretly?

Answer»

<STRONG>Answer:

Do you love Chinese silk? This wondrous natural material was the imperial dynasties' #1 export item for many centuries, and it is STILL a hot item wherever the silky material goes.

Shiny, lustrous, soft yet strong, it can be beautifully and brilliantly dyed. The history of Chinese silk stretches back more than 2,000 years, and here is how silk is MADE and where to shop for modern products.

China Is the World's Foremost Silk Producer

China produces about 150,000 metric tons annually. This is much more than the REST of the world combined producing 78% of the world's silk. Only India has a comparably large industry that produces about 30,000 metric tons.

Top Modern Silk Producing Regions

Silk is mainly produced in the south of the Yangtze River Delta. Renowned silk producing regions are Jiangsu, Zhejiang and Sichuan provinces. Cities such as Suzhou, Hangzhou, Nanjing, and Shaoxing are well known for their silk industries.

History of Silk

Imperial era Chinese clothingImperial era Chinese clothing

The people living in the region were the inventors of silk fabric, and no other culture discovered this process independently. The history of silk making stretches back 6,000 years, and the earliest example of silk fabric that has been discovered dates from 3,630 BC in Henan. Silk cloth manufacture was well advanced during the Shang Dynasty (1600-1046 BC) era.

Explanation:

Discussion

22.	i earned 20$ in lock down who want to involve in online bignuss install pi network and use code-arymanoj now rules 100pie =$1 (you have to collect pie and make more member pi is continusly incresing if you click pocew in once day sen to this other people and increse your 1 pi per member ) also incrdses perhour=0.25 pie it is best to bigness hopy yue make strong network)100% real guys you can check in youtube about the bignessgo ready guys lets begain????
Answer» Answer: noone is interested because we are not this much big to EARN MONEY thanks for information follow me and MARK me as BRAINIEST

22.

i earned 20$ in lock down who want to involve in online bignuss install pi network and use code-arymanoj now rules 100pie =$1 (you have to collect pie and make more member pi is continusly incresing if you click pocew in once day sen to this other people and increse your 1 pi per member ) also incrdses perhour=0.25 pie it is best to bigness hopy yue make strong network)100% real guys you can check in youtube about the bignessgo ready guys lets begain????

Answer»

Answer:

noone is interested because we are not this much big to EARN MONEY thanks for information

follow me and MARK me as BRAINIEST

Discussion

23.	A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m
Answer» ANSWER: I can't UNDERSTAND this QUESTION

23.

A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m

Answer»

ANSWER:

I can't UNDERSTAND this QUESTION

Discussion

24.	Out of 20 attempts a basket ball player scored eight times. What percent of his chances did he score?
Answer» ANSWER: ⭕..#@Ñ$W£R...... 40% 8/20=2/5=. 4 or 40% CHANCE of scoring. *ẞRAINLIEST* PLS**.....☺️❤️

24.

Out of 20 attempts a basket ball player scored eight times. What percent of his chances did he score?

Answer»

ANSWER:

⭕..#@Ñ$W£R......

40%

8/20=2/5=. 4 or 40% CHANCE of scoring.

ẞRAINLIEST *PLS***.....☺️❤️

Discussion

25.	Sarkat vidhi mein kitne station rakhe ja skte hai ?
Answer» Answer: 16 station RAKHE JAA sakte h PLEASE mark it as BRAINLIEST

25.

Sarkat vidhi mein kitne station rakhe ja skte hai ?

Answer»

Answer:

16 station RAKHE JAA sakte h PLEASE mark it as BRAINLIEST

Discussion

26.	A current flows through an electrical device of resistance 120 ohm calculate power of the device
Answer» ANSWER: BRO what is the VALUE of CURRENT

26.

A current flows through an electrical device of resistance 120 ohm calculate power of the device

Answer»

ANSWER:

BRO what is the VALUE of CURRENT

Discussion

27.	Answer fast me frinds
Answer» ANSWER: KUCH JADA NAHI HOGAYA..

27.

Answer fast me frinds

Answer»

ANSWER:

KUCH JADA NAHI HOGAYA..

Discussion

28.	The force exerted by machines is called __________
Answer» ANSWER: *INPUT* *FORCE* is the MACHINES from which force exert. hope it HELPS you.....

28.

The force exerted by machines is called __________

Answer»

ANSWER:

INPUT FORCE is the MACHINES from which force exert.

hope it HELPS you.....

Discussion

29.	A double convex lens of focal length. what is the effect of its focal length when cut along principal axis, perpendicular
Answer» If the lens is cut along the principal axis than there will be no change in the FOCAL length of the lens because the RADIUS of curvature will remain the same, hence the focal length will remain unchanged. The magnification produced by a SPHERICAL mirror and a spherical lens is + 0.8. I *hope* *this* *ANSWER* *will* *help* *you. Please* *MARK* me *Birlianist*.

29.

A double convex lens of focal length. what is the effect of its focal length when cut along principal axis, perpendicular

Answer»

If the lens is cut along the principal axis than there will be no change in the FOCAL length of the lens because the RADIUS of curvature will remain the same, hence the focal length will remain unchanged. The magnification produced by a SPHERICAL mirror and a spherical lens is + 0.8.

I hope this ANSWER will help you. Please MARK me Birlianist.

Discussion

30.	a railway carriage of mass 9000 kilogram moving with a speed of 36 km per hour collides with a stationary carriage of the same mass after the collision the carriage kit Kappal time move together Katli their common speed after collision what is the nature of the solution give reason for your answer
Answer» Answer: Explanation: MASS of the cariage (mc) = 9000 kg = 90,00,000 gram velocity of carriage (vc) = 35 km/hr = 9.7 m/s Total momentum of carriage (p1) = mc vc = 9000000 X 9.7 = 87300000 kg.m.s-1 and, Total momentum of carriage at rest (p2) = 0 Hence, total momentum= 87300000 kg.m.s-1+0= 87300000 kg.m.s-1 i.e. total momentum before collision = 87300000 kg.m.s-1......... (1) SIMILARLY, Let us consider the commmon velocity of the both the carriage after collision be 'v', So, total momentum of the system after collision= 9000000 .v +9000000 .v or, total momentum after collision = 18000000.v............ (2) USING principle of conservation of momentum, we get, total momentum before collision = total momentum after collision or, 18000000.v = 87300000 ∴ v = 4.85 m/s ans ans: This collision is inelastic collision.

30.

a railway carriage of mass 9000 kilogram moving with a speed of 36 km per hour collides with a stationary carriage of the same mass after the collision the carriage kit Kappal time move together Katli their common speed after collision what is the nature of the solution give reason for your answer

Answer»

Answer:

Explanation:

MASS of the cariage (mc) = 9000 kg = 90,00,000 gram

velocity of carriage (vc) = 35 km/hr = 9.7 m/s

Total momentum of carriage (p1) = mc vc = 9000000 X 9.7 = 87300000 kg.m.s-1

and,

Total momentum of carriage at rest (p2) = 0

Hence, total momentum= 87300000 kg.m.s-1+0= 87300000 kg.m.s-1

i.e. total momentum before collision = 87300000 kg.m.s-1......... (1)

SIMILARLY,

Let us consider the commmon velocity of the both the carriage after collision be 'v',

So, total momentum of the system after collision= 9000000 .v +9000000 .v

or, total momentum after collision = 18000000.v............ (2)

USING principle of conservation of momentum, we get,

total momentum before collision = total momentum after collision

or, 18000000.v = 87300000

∴ v = 4.85 m/s ans

ans: This collision is inelastic collision.

Discussion

31.	50:- (i) Find the expression for the average power dissipated when an a.c. voltage is applied to a purelyresistive circuit?
Answer» ANSWER: = i₀v₀/2 = 0 Explanation:

31.

50:- (i) Find the expression for the average power dissipated when an a.c. voltage is applied to a purelyresistive circuit?

Answer»

ANSWER:

= i₀v₀/2 = 0

Explanation:

Discussion

32.	Can some pls answer this..
Answer» ANSWER: I am not SURE if it is RIGHT

32.

Can some pls answer this..

Answer»

ANSWER:

I am not SURE if it is RIGHT

Discussion

33.	Tell me important question of magnetic effect class 10
Answer» Answer: the IMPORTANT QUESTION is FARADAY's law of INDUCTION

33.

Tell me important question of magnetic effect class 10

Answer»

Answer:

the IMPORTANT QUESTION is FARADAY's law of INDUCTION

Discussion

34.	explain with the help of diagram how plane polarised light can be produced by scattering of light from the Sun
Answer» Explanation: Direct sunlight is not polarized. It is because of its radiation vectors are in zig zag DIRECTION with UN equal movements. When this light is scattered by the air molecules its produces linear polarised light, which is at 90 degrees to the ACTUAL light. Only that light can be seen which is perpendicular to the PLANE of its movement. This phenomena was also explained by a scientist named RAYLEIGH

34.

explain with the help of diagram how plane polarised light can be produced by scattering of light from the Sun

Answer»

Explanation:

Direct sunlight is not polarized. It is because of its radiation vectors are in zig zag DIRECTION with UN equal movements.

When this light is scattered by the air molecules its produces linear polarised light, which is at 90 degrees to the ACTUAL light. Only that light can be seen which is perpendicular to the PLANE of its movement. This phenomena was also explained by a scientist named RAYLEIGH

Discussion

35.	What is a dielectric constant?How will the electric be affected if it is doubled?
Answer» ANSWER: the answer is Explanation: REFER to the ATTACHMENT for your answer plz MARK as BRAINLIEST

35.

What is a dielectric constant?How will the electric be affected if it is doubled?

Answer»

ANSWER:

the answer is

Explanation:

REFER to the ATTACHMENT for your answer

plz MARK as BRAINLIEST

Discussion

36.	A source of sound has a frequency of 300 Hz and a wave length of 60 cm. then its velocity is
Answer» EXPLANATION: REFER the picture velocity=frequency×Wavelength

36.

A source of sound has a frequency of 300 Hz and a wave length of 60 cm. then its velocity is

Answer»

EXPLANATION:

REFER the picture

velocity=frequency×Wavelength

Discussion

37.	What is shear stress in simplest language
Answer» Shear stress, OFTEN denoted by τ (tau), is the COMPONENT of stress COPLANAR with a material CROSS SECTION. Shear stress arises from the force vector component parallel to the cross section of the material

Discussion

38.	What is wavelength?.........
Answer»

Discussion

39.	Suosiusmarkthe correct alternative in the box with pen:1. Phenolphthalein is(A) the natural indicatorcan olfactory indicator(B) the synthetic indicator(D) the universal indicatorWhen phenolphthalein is added to NaOH, the colour of the solutionwill become(A) colourless(B) red(C) pink (D) yellowThe colour of universal indicator paper in neutral solutionis ....***(A) yellow (B) green (C) orange (D) pink4. When phenolphthalein is added to HCI, the colour of the solutionwill be(A) red (B) pink (C) green (D) colourless
Answer» Answer: I THINK point Explanation: b a c a PLEASE mark as brilliant

39.

Suosiusmarkthe correct alternative in the box with pen:1. Phenolphthalein is(A) the natural indicatorcan olfactory indicator(B) the synthetic indicator(D) the universal indicatorWhen phenolphthalein is added to NaOH, the colour of the solutionwill become(A) colourless(B) red(C) pink (D) yellowThe colour of universal indicator paper in neutral solutionis ....***(A) yellow (B) green (C) orange (D) pink4. When phenolphthalein is added to HCI, the colour of the solutionwill be(A) red (B) pink (C) green (D) colourless

Answer»

Answer:

I THINK point

Explanation:

b
a
c
a

PLEASE mark as brilliant

Discussion

40.	When we hit at the bottom of pile of carrom coins other coins fall vertically on the carom board why?Pls tell proper answer.......
Answer» ANSWER: sorry Explanation: I NEED points pls FORGIVE me

40.

When we hit at the bottom of pile of carrom coins other coins fall vertically on the carom board why?Pls tell proper answer.......

Answer»

ANSWER:

sorry

Explanation:

I NEED points

pls FORGIVE me

Discussion

41.	Iu une layer.J0PInerman life because 0.1. radiantons reuLOW TEMPERATURESPROPERTIES OF SUBSTANCES AT LOW TEMPERature
Answer» ANSWER: ?????????????????????????????................ what is the QUESTION about?? POST PROPER QUESTIONS

41.

Iu une layer.J0PInerman life because 0.1. radiantons reuLOW TEMPERATURESPROPERTIES OF SUBSTANCES AT LOW TEMPERature

Answer»

ANSWER:

?????????????????????????????................ what is the QUESTION about?? POST PROPER QUESTIONS

Discussion

42.	Explain about law of conversation of linear momentum
Answer» Answer: The law of conservation of linear momentum STATES that if no external forces ACT on the system of two COLLIDING objects, then the vector sum of the linear momentum of each BODY REMAINS constant and is not affected by their mutual interaction.

42.

Explain about law of conversation of linear momentum

Answer»

Answer:

The law of conservation of linear momentum STATES that if no external forces ACT on the system of two COLLIDING objects, then the vector sum of the linear momentum of each BODY REMAINS constant and is not affected by their mutual interaction.

Discussion

43.	when we double both the area of cross section and length of a conductor then what will be the resistance
Answer» ANSWER: When we DOUBLE both the AREA of cross section and LENGTH of a conductor then the resistance of the conductor will BECOME half. Explanation: This is because the resistance of the conductor is inversely proportional to length and area of cross section of the conductor. Hope this will be helpful Thank you!

43.

when we double both the area of cross section and length of a conductor then what will be the resistance

Answer»

ANSWER:

When we DOUBLE both the AREA of cross section and LENGTH of a conductor then the resistance of the conductor will BECOME half.

Explanation:

This is because the resistance of the conductor is inversely proportional to length and area of cross section of the conductor.

Hope this will be helpful

Thank you!

Discussion

44.	Prove that time period of a satellite is given by T = root of 3pi / G × rho.
Answer» ........................................

Discussion

45.	Energy from various sources is considered to have been derivedfrom the sun. Do you agree? Justify your answer.
Answer» Answer: hope this HELPS you Explanation: YES, I agree with the STATEMENT that energy from various sources is considered to have been DERIVED from the Sun. Sun is the ultimate source of energy. All forms of energy are directly or indirectly derived from the solar energy.

45.

Energy from various sources is considered to have been derivedfrom the sun. Do you agree? Justify your answer.

Answer»

Answer:

hope this HELPS you

Explanation:

YES, I agree with the STATEMENT that energy from various sources is considered to have been DERIVED from the Sun. Sun is the ultimate source of energy. All forms of energy are directly or indirectly derived from the solar energy.

Discussion

46.	A projectile is fired at 30° with momentum p.Neglecting air friction,the change in kinetic energy when it returns to the ground will bea)zerob)60%c)30%d)100%
Answer» Answer: Given: Projectile is fired at 30°. To find: CHANGE in Kinetic ENERGY upon reaching the ground. Calculation: LET velocity of Projection be v So, the initial Velocity can be divided into perpendicular components : $v_{x} = v \cos( \theta)$ and $v_{y} = v \sin( \theta)$ Now CONSIDERING a Projectile to be consisting of 2 simultaneously occuring linear motions. , we can say that : $v_{x} \: (reaching \: ground) = v \cos( \theta)$ and $v_{y} \: (reaching \: ground) = - v \sin( \theta)$ Negative sign has been considered due to action of gravity downwards. Now, initial Kinetic Energy: $\boxed{ke1 = \frac{1}{2} m {v}^{2}}$ Final total velocity : $\|v_{final}\| = \sqrt{ { {v}^{2} \cos( \theta) }^{2} + {v}^{2} { \sin( \theta) }^{2} } \\ = > \|v_{final}\| = v$ So final Kinetic Energy: $\boxed{ke2 = \frac{1}{2} m {v}^{2}}$ So change in Kinetic Energy = 0%.

46.

A projectile is fired at 30° with momentum p.Neglecting air friction,the change in kinetic energy when it returns to the ground will bea)zerob)60%c)30%d)100%

Answer»

Answer:

Given:

Projectile is fired at 30°.

To find:

CHANGE in Kinetic ENERGY upon reaching the ground.

Calculation:

LET velocity of Projection be v

So, the initial Velocity can be divided into perpendicular components :

$v_{x} = v \cos( \theta)$

and

$v_{y} = v \sin( \theta)$

Now CONSIDERING a Projectile to be consisting of 2 simultaneously occuring linear motions. , we can say that :

$v_{x} \: (reaching \: ground) = v \cos( \theta)$

and

$v_{y} \: (reaching \: ground) = - v \sin( \theta)$

Negative sign has been considered due to action of gravity downwards.

Now, initial Kinetic Energy:

$\boxed{ke1 = \frac{1}{2} m {v}^{2}}$

Final total velocity :

$|v_{final}| = \sqrt{ { {v}^{2} \cos( \theta) }^{2} + {v}^{2} { \sin( \theta) }^{2} } \\ = > |v_{final}| = v$

So final Kinetic Energy:

$\boxed{ke2 = \frac{1}{2} m {v}^{2}}$

So change in Kinetic Energy = 0%.

Discussion

47.	Shine a torch in the dark. Does the beam of light appear to take a straight path or a curved path?
Answer» Answer: the BEAM appears to travel in STRAIGHT path because of the CONCAVE mirror used as REFLECTOR around its light SOURCE(bulb)

47.

Shine a torch in the dark. Does the beam of light appear to take a straight path or a curved path?

Answer»

Answer:

the BEAM appears to travel in STRAIGHT path because of the CONCAVE mirror used as REFLECTOR around its light SOURCE(bulb)

Discussion

48.	What is the answer? 1 . point Q 2. point R 3. point P 4. point S
Answer» Answer: 1 point Q Explanation: because the graph SHOWS from p to q the speed is inceared r and s it is DECREASING

48.

What is the answer? 1 . point Q 2. point R 3. point P 4. point S

Answer»

Answer:

1 point Q

Explanation:

because the graph SHOWS from p to q the speed is inceared r and s it is DECREASING

Discussion

49.	Urgent one please answer fast ....Answer of 4th question
Answer» Answer: 16i - 18j Explanation: We know that, W = Fs W = (2×8) i + (3×-6)j + (0×5)K (scalar product of FORCE & DISPLACEMENT ) = 16i -18j *HOPE* *THIS* *HELPS* *YOU*......

49.

Urgent one please answer fast ....Answer of 4th question

Answer»

Answer:

16i - 18j

Explanation:

We know that, W = Fs

W = (2×8) i + (3×-6)j + (0×5)K (scalar product of FORCE & DISPLACEMENT )

= 16i -18j

HOPE THIS HELPS YOU......

Discussion

50.	Please make it clear for me that what is potential difference?
Answer» Answer: the WORK done in TRANSFERING of positive charge from ONE CONDUCTOR to another

50.

Please make it clear for me that what is potential difference?

Answer»

Answer:

the WORK done in TRANSFERING of positive charge from ONE CONDUCTOR to another

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

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A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m. (Can u say the formula).​

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⭕..#@Ñ$W£R......

ẞRAINLIEST PLS.....☺️❤️

Sarkat vidhi mein kitne station rakhe ja skte hai ?

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Answer fast me frinds​

The force exerted by machines is called __________

A double convex lens of focal length. what is the effect of its focal length when cut along principal axis, perpendicular

If the lens is cut along the principal axis than there will be no change in the FOCAL length of the lens because the RADIUS of curvature will remain the same, hence the focal length will remain unchanged. The magnification produced by a SPHERICAL mirror and a spherical lens is + 0.8.

I hope this ANSWER will help you. Please MARK me Birlianist.

MASS of the cariage (mc) = 9000 kg = 90,00,000 gram

velocity of carriage (vc) = 35 km/hr = 9.7 m/s

Total momentum of carriage (p1) = mc vc = 9000000 X 9.7 = 87300000 kg.m.s-1

and,

Total momentum of carriage at rest (p2) = 0

Hence, total momentum= 87300000 kg.m.s-1+0= 87300000 kg.m.s-1

i.e. total momentum before collision = 87300000 kg.m.s-1......... (1)

SIMILARLY,

Let us consider the commmon velocity of the both the carriage after collision be 'v',

So, total momentum of the system after collision= 9000000 .v +9000000 .v

or, total momentum after collision = 18000000.v............ (2)

USING principle of conservation of momentum, we get,

total momentum before collision = total momentum after collision

or, 18000000.v = 87300000

∴ v = 4.85 m/s ans

ans: This collision is inelastic collision.

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ਹੇਠ ਵਲਖੀਆਂ ਵਿਿੱਚੋਂ ਵਕਹੜਾ ਤਰੀਕਾ ਫੁਰਤੀ ਿਧਾਉਣ ਲਈ ਸਹੀ ਨਹੀਂ ਹੈ

A metergauge train is running duenorth with constant speed of90 km hr-1 on ahorizontal track. Ifthe Verticalcomponent of earth'smagneticfield is 3x10-5 Wbm-2Calculatetheemf induced across the axleof the train of1.25 m. (Can u say the formula).

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ẞRAINLIEST *PLS***.....☺️❤️

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Answer fast me frinds

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