67486 + Interview Questions in Secondary School in Physics

1.	Q5. Using table 2.3 and 2.4 from physics text book comment on following statements with proper mathematical arguments a) How far the electron is from the nucleus in hydrogen atom b) How much space is available in hydrogen atom nucleus in terms of size of a proton c) Can we locate a proton using visible light d) What is the size of earth in terms of moon-earth distance e) How big is a proton compared to an electron f) How heavy the earth is compared to our moon g) How big the sun is compared to our earthclass 11
Answer»

Discussion

2.	What are ghost.Why do they sleep in morning? Dont their mother thought them manner? Dont scam
Answer» Answer: the condition of having an ABNORMALLY (TYPICALLY dangerously) low BODY temperature Explanation: plz mark me as a BRAINLIEST

2.

What are ghost.Why do they sleep in morning? Dont their mother thought them manner? Dont scam

Answer»

Answer:

the condition of having an ABNORMALLY (TYPICALLY dangerously) low BODY temperature

Explanation:

plz mark me as a BRAINLIEST

Discussion

3.	Calss 12 ka monthly exam September physics question paper
Answer»

Discussion

4.	Online physics tuitions class 12? please help
Answer» EXPLANATION: You can VISIT Examfear.com BYJU's Doubtnut You can ALSO download unacademy

4.

Online physics tuitions class 12? please help

Answer»

EXPLANATION:

You can VISIT Examfear.com

BYJU's

Doubtnut

You can ALSO download unacademy

Discussion

5.	A train covers one half of the distance between two stations with an average speed V1 and remaining half with an average speed V2 . Let V denote the average speed of the train for the whole journey. Show that 1 V = 1 2 [ 1 V1 + 1 V2 ]
Answer» Answer: EXPLANATION: If The HALF distance (x) covered with the speed v 1 in t 1 time. Using formula of speed, v 1 = t 1 x so, t 1 = v 1 x And another half distance (x), covered with speed v 2 in time t 2 . so, v 2 =xt 2 t 2 = v 2 x Average VELOCITY= TOTAL time Total distance Total time=t 1 +t 2 = v 1 x + v 2 x = v 1 v 2 (v 2 ∗x+v 1 ∗x) Total distance =x+x=2x On putting the VALUES of total distance and total time in the formula of average speed, we get Average speed= ( v 1 ∗v 2 v 2 x+v 1 x ) 2x V= (v 1 +v 2 ) 2v 1 v 2

5.

A train covers one half of the distance between two stations with an average speed V1 and remaining half with an average speed V2 . Let V denote the average speed of the train for the whole journey. Show that 1 V = 1 2 [ 1 V1 + 1 V2 ]

Answer»

Answer:

EXPLANATION:

If The HALF distance (x) covered with the speed v

1

in t

1

time.

Using formula of speed, v

1

=

t

1

x

so, t

1

=

v

1

x

And another half distance (x), covered with speed v

2

in time t

2

.

so, v

2

=xt

2

t

2

=

v

2

x

Average VELOCITY=

TOTAL time

Total distance

Total time=t

1

+t

2

=

v

1

x

+

v

2

x

=

v

1

v

2

(v

2

∗x+v

1

∗x)

Total distance =x+x=2x

On putting the VALUES of total distance and total time in the formula of average speed, we get

Average speed=

(

v

1

∗v

2

v

2

x+v

1

x

)

2x

V=

(v

1

+v

2

)

2v

1

v

2

Discussion

6.	Yeah amit oppa he tell me mea.ss.on whatapp but i can'thave you
Answer» ANSWER: OOO OK (〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)

6.

Yeah amit oppa he tell me mea.ss.on whatapp but i can'thave you

Answer»

ANSWER:

OOO

OK (〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)(〒﹏〒)

Discussion

7.	The materials which have resistivity in the order of 10^14 to 10^16 ohm(1) insulators (2) conductors (3) semiconductors (4) None of thesepls give correct ans and no spam
Answer» ANSWER: SEMI CONDUCTOR is the CORRECT answer

7.

The materials which have resistivity in the order of 10^14 to 10^16 ohm(1) insulators (2) conductors (3) semiconductors (4) None of thesepls give correct ans and no spam

Answer»

ANSWER:

SEMI CONDUCTOR is the CORRECT answer

Discussion

8.	Prove that [(sin(q) + sin (2q)) / (1 + vos (q) + cos (2q))] = tan(q)
Answer»

Discussion

9.	Good jobwanna this type of answersQuestion: What is Silent?#MeSilentHoGayiHu
Answer» Answer: HTTPS://www.FACEBOOK.com/profile.php?id=100066377897172 it is my Facebook profil GUYS send FRIEND request

9.

Good jobwanna this type of answersQuestion: What is Silent?#MeSilentHoGayiHu

Answer»

Answer:

HTTPS://www.FACEBOOK.com/profile.php?id=100066377897172 it is my Facebook profil GUYS send FRIEND request

Discussion

10.	Two balls of masses 40kg and 20kg are moving with velocities 10m/s and 50m/s respectively towards each other. They collide and embedded . What will be the velocity of the system
Answer» 40KG into 20KG = 800KG

Discussion

11.	What is school?Why do people suffer from depression in small ages due to school? Dont scam irrelevant answers.
Answer» Answer: A school is an educational institution designed to provide LEARNING spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes compulsory. In these systems, students PROGRESS through a series of schools. Not only does school sometimes contribute to depression, depression can also interfere with school. Moreover, research shows that 75 percent of all mental health conditions begin by age 24. Hence, the college years are a critical time for understanding and talking about teen mental health. Please MARK me as Brainlist☺☺ Stay safe and KEEP smile❤❤ Have a great day✌✌

11.

What is school?Why do people suffer from depression in small ages due to school? Dont scam irrelevant answers.

Answer»

Answer:

A school is an educational institution designed to provide LEARNING spaces and learning environments for the teaching of students under the direction of teachers. Most countries have systems of formal education, which is sometimes compulsory. In these systems, students PROGRESS through a series of schools.

Not only does school sometimes contribute to depression, depression can also interfere with school. Moreover, research shows that 75 percent of all mental health conditions begin by age 24. Hence, the college years are a critical time for understanding and talking about teen mental health.

Please MARK me as Brainlist☺☺

Stay safe and KEEP smile❤❤

Have a great day✌✌

Discussion

12.	When is the acceleration taken as negative?
Answer» ANSWER: An acceleration will be taken as negative if the OBJECT MOVES in the OPPOSITE direction to the direction of acceleration.

12.

When is the acceleration taken as negative?

Answer»

ANSWER:

An acceleration will be taken as negative if the OBJECT MOVES in the OPPOSITE direction to the direction of acceleration.

Discussion

13.	Check the correction of the relation.h = 2TCostheta/ rpg ,. Where h= height , r=radius , p=density, g= acc due to gravity , I am not sure about T Plz answer this question fast
Answer»

Discussion

14.	What body is diplacement of shown below. a)6m b) 7m a) 8m d) 23m
Answer» ANSWER: I don't UNDERSTAND your QUESTION can you SEND again

14.

What body is diplacement of shown below. a)6m b) 7m a) 8m d) 23m

Answer»

ANSWER:

I don't UNDERSTAND your QUESTION can you SEND again

Discussion

15.	Which question unniesorry but I didn't remember I am fine what about you
Answer» ANSWER: I ask so much time are you onli.ne and sometimes I SEE you are also not REPLYING in pin

15.

Which question unniesorry but I didn't remember I am fine what about you

Answer»

ANSWER:

I ask so much time are you onli.ne and sometimes I SEE you are also not REPLYING in pin

Discussion

16.	Kisko kya bulaya what is orange
Answer» Answer: aare uus question me itzmsdhoni karke message DIYA THANA uski baat KAR RAHA THA

16.

Kisko kya bulaya what is orange

Answer»

Answer:

aare

uus question me itzmsdhoni karke message DIYA THANA

uski baat KAR RAHA THA

Discussion

17.	Hmm Tamil Nadu than neega ?
Answer» Answer: HI ma ACCOUNT ban panitan KA so CHANGE to this

17.

Hmm Tamil Nadu than neega ?

Answer»

Answer:

HI ma ACCOUNT ban panitan KA so CHANGE to this

Discussion

18.	the winds named by various names at various places in the world is called as______????? a) periodic wind b) variable wind c) westerlies d) local wind. don't spam will be reported.
Answer» ANSWER: I THINK the answer is OPTION C)WESTERLIES.

18.

the winds named by various names at various places in the world is called as______????? a) periodic wind b) variable wind c) westerlies d) local wind. don't spam will be reported.

Answer»

ANSWER:

I THINK the answer is OPTION C)WESTERLIES.

Discussion

19.	What is the simplest type of motion?
Answer» Answer: The simplest form of motion is the motion in a straight LINE. The distance and displacement are the quantities USED to DETERMINE the FINAL position of the object with RESPECT to the initial position.

19.

What is the simplest type of motion?

Answer»

Answer:

The simplest form of motion is the motion in a straight LINE. The distance and displacement are the quantities USED to DETERMINE the FINAL position of the object with RESPECT to the initial position.

Discussion

20.	Match the following. please answer
Answer» L KHESARI LAL yadav Pawan Singh DINESH Lal yadav nirahua SALMAN Khan tiger Shroff ritesh pandey

Discussion

21.	दो शहरों के बीच की दूरी को किस मात्रा से मांपेगे और क्यों मापेगे??
Answer» HIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Discussion

22.	the torque produced by an indicating instrument by utilizing the effect of electric current is known as
Answer» Deflecting torque The torque produced in an indicating instrument by UTILIZING magnetic, electrodynamic, electromagnetic, THERMAL, chemical and ELECTROSTATIC effects is KNOWN as Deflecting torque.

22.

the torque produced by an indicating instrument by utilizing the effect of electric current is known as

Answer»

Deflecting torque

The torque produced in an indicating instrument by UTILIZING magnetic, electrodynamic, electromagnetic, THERMAL, chemical and ELECTROSTATIC effects is KNOWN as Deflecting torque.

Discussion

23.	The position (x) of a particle moving along x axis varies with time t as t=√3-3, where all quantities are in SI units. If displacement of the particle in time duration t=0 to t=5 s, is D, then find value of (D - 50) in m.help
Answer» $\implies\rm t = \sqrt{x} -3$ •• differentiating both sides. $\implies \rm dt = \dfrac{1}{2}\times \dfrac{1}{\sqrt{x}}.dx - 0$ $\implies \rm \dfrac{dx}{dt}= 2\sqrt{x}$ $\implies \bf v = 2\sqrt{x}$ We KNOW that, a = v.dv/dx $\implies \rm v = 2\sqrt{x}$ $\implies \rm dv= 2\times \dfrac{1}{2\: \sqrt{x}} .dx$ $\implies \rm \dfrac{dv}{dx}= \dfrac{1}{\sqrt{x}}$ $\to\rm v.\dfrac{dv}{dx} = 2\sqrt{x}\times \dfrac{1}{\sqrt{x}}$ $\to \bf a = 2 ms^{-2}$ ★ As acceleration is constant, displacement by equation of motion: s = UT +½(a)t² D = 0 + ½(2){(5)²-(0)²} D = 25 》 D - 50 = 25 - 50 = -25m

23.

The position (x) of a particle moving along x axis varies with time t as t=√3-3, where all quantities are in SI units. If displacement of the particle in time duration t=0 to t=5 s, is D, then find value of (D - 50) in m.help

Answer»

$\implies\rm t = \sqrt{x} -3$

•• differentiating both sides.

$\implies \rm dt = \dfrac{1}{2}\times \dfrac{1}{\sqrt{x}}.dx - 0$

$\implies \rm \dfrac{dx}{dt}= 2\sqrt{x}$

$\implies \bf v = 2\sqrt{x}$

We KNOW that, a = v.dv/dx

$\implies \rm v = 2\sqrt{x}$

$\implies \rm dv= 2\times \dfrac{1}{2\: \sqrt{x}} .dx$

$\implies \rm \dfrac{dv}{dx}= \dfrac{1}{\sqrt{x}}$

$\to\rm v.\dfrac{dv}{dx} = 2\sqrt{x}\times \dfrac{1}{\sqrt{x}}$

$\to \bf a = 2 ms^{-2}$

★ As acceleration is constant, displacement by equation of motion:

s = UT +½(a)t²
D = 0 + ½(2){(5)²-(0)²}
D = 25

》 D - 50 = 25 - 50 = -25m

Discussion

24.	Differentiation of tan³x ? step wise solution
Answer» ANSWER: TAN 2X to the POWER 2 Explanation: 3x2 The answer is this

24.

Differentiation of tan³x ? step wise solution

Answer»

ANSWER:

TAN 2X to the POWER 2

Explanation:

3x2

The answer is this

Discussion

25.	Maxwell needle experiment viva voice
Answer» Answer: yes Explanation: PLEASE mark as BRANLIEST answer

25.

Maxwell needle experiment viva voice

Answer»

Answer:

yes

Explanation:

PLEASE mark as BRANLIEST answer

Discussion

26.	1A small ball of mass 2kg is hanging with a string of length 7. Now a constant horizontal force F= 20N starts acting on it. Find maximum angular displacement in degree.
Answer» Answer: answer and steps are in the ATTACHMENT, hope you can UNDERSTAND them, please MAKE me as a BRAINLIEST, THANK you. Explanation:

26.

1A small ball of mass 2kg is hanging with a string of length 7. Now a constant horizontal force F= 20N starts acting on it. Find maximum angular displacement in degree.

Answer»

Answer:

answer and steps are in the ATTACHMENT, hope you can UNDERSTAND them, please MAKE me as a BRAINLIEST, THANK you.

Explanation:

Discussion

27.	Electric current is measured by an instrument called ammeter true or false trueeeee
Answer» Answer: An instrument called ammeter MEASURES electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured. ALSO ammeter has negligible RESISTANCE, thus no voltage gets dropped ACROSS it.

27.

Electric current is measured by an instrument called ammeter true or false trueeeee

Answer»

Answer:

An instrument called ammeter MEASURES electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured. ALSO ammeter has negligible RESISTANCE, thus no voltage gets dropped ACROSS it.

Discussion

28.	Sari arushi saptiya
Answer»

Discussion

29.	ese train travels in a straight line from the city a to b. iit covered 1040 kilometres. tiffin aeroplane flies in a curved path between the same to cities how much it will cover?Why?
Answer» Answer: 1040 kilometres Explanation: between the same to CITIES how MUCH it will COVER?Why?

29.

ese train travels in a straight line from the city a to b. iit covered 1040 kilometres. tiffin aeroplane flies in a curved path between the same to cities how much it will cover?Why?

Answer»

Answer:

1040 kilometres

Explanation:

between the same to CITIES how MUCH it will COVER?Why?

Discussion

30.	The radius of planet Mercury is 2439.7 km and its mass density is 5.43 g/cm3. What is the escape velocity on Mercury?
Answer» Answer: HYY BRO KESE ho ,, KYA ho raha h ..

30.

The radius of planet Mercury is 2439.7 km and its mass density is 5.43 g/cm3. What is the escape velocity on Mercury?

Answer»

Answer:

HYY BRO KESE ho ,, KYA ho raha h ..

Discussion

31.	सीधा रीता वाले संधारित्र को भी विभाग तक आवेशित किया गया है इसकी विद्युत ऊर्जा के लिए स्थापित कीजिए
Answer»

Discussion

32.	The value of acceleration due to gravity depends on the radius of the earth .give reason
Answer» ANSWER: As G=GM/r^2, the value of g is GREATER at the poles than at the EQUATOR. So, the more the radius of the earth, the less is the value of g(ACCELERATION due to gravity)

32.

The value of acceleration due to gravity depends on the radius of the earth .give reason

Answer»

ANSWER:

As G=GM/r^2, the value of g is GREATER at the poles than at the EQUATOR. So, the more the radius of the earth, the less is the value of g(ACCELERATION due to gravity)

Discussion

33.	Factors of x² + xy - 2 y²No spam ❌ ❌
Answer» QUESTION:- Factors of x² + XY - 2 y² Solution :- ⇒ x² - xy - 2y² ⇒ x² - 2xy + xy - 2y² ⇒ X(x - 2Y) + y(x - 2y) ⇒(x + y) (x - 2y) [Ans]

33.

Factors of x² + xy - 2 y²No spam ❌ ❌

Answer»

QUESTION:-

Factors of x² + XY - 2 y²

Solution :-

⇒ x² - xy - 2y²

⇒ x² - 2xy + xy - 2y²

⇒ X(x - 2Y) + y(x - 2y)

⇒(x + y) (x - 2y) [Ans]

Discussion

34.	Remote Sensing satellite of Earth revolves in a circular orbit at a height of 0.25×10^6 m above the surface of the Earth.If earth radius is 6.38×10^6 m and g=9.8 ms -2 then the orbital speed of the satellite is?
Answer» ➩Given:- •Height of a satellite h = 0.25 × 10^6m • Earth's radius, Re = 6.38 × 10^6m ➩Solution:- ➞For the satellite revolving AROUND the Earth, orbital velocity of the satellite vo = √GMe/Re = √GMe/ [ Re (1+ h/Re)] vo = √gRe/1+(h/Re) ➞Substitutes the VALUES of g, Re and h, we get vo = √60×10^6 m/s vo = 7.76 × 10^3m/s vo = 7.76 km/s ∴ The orbital SPEED of the satellite is 7.76 km/s!

34.

Remote Sensing satellite of Earth revolves in a circular orbit at a height of 0.25×10^6 m above the surface of the Earth.If earth radius is 6.38×10^6 m and g=9.8 ms -2 then the orbital speed of the satellite is?

Answer»

➩Given:-

•Height of a satellite h = 0.25 × 10^6m

• Earth's radius, Re = 6.38 × 10^6m

➩Solution:-

➞For the satellite revolving AROUND the Earth, orbital velocity of the satellite

vo = √GMe/Re = √GMe/ [ Re (1+ h/Re)]

vo = √gRe/1+(h/Re)

➞Substitutes the VALUES of g, Re and h, we get

vo = √60×10^6 m/s

vo = 7.76 × 10^3m/s

vo = 7.76 km/s

∴ The orbital SPEED of the satellite is 7.76 km/s!

Discussion

35.	Derive:dQ/dt=-KA dt/dx
Answer» Answer: REPLY using the other hand the other hand the other hand the other hand the other hand the other hand the other hand the other hand I can GET the other day I can get the latest VERSION here to Guwahati Assam and pic is E

35.

Derive:dQ/dt=-KA dt/dx

Answer»

Answer:

REPLY using the other hand the other hand the other hand the other hand the other hand the other hand the other hand the other hand I can GET the other day I can get the latest VERSION here to Guwahati Assam and pic is E

Discussion

36.	a body travels 12 m long is direction and 10 metres along south and finally 12 m to east find its displacement
Answer» Answer: Displament is 12- 10 = 2M Explanation: As we now that in DISPLACEMENT we need to KNOW the shortest DISTANCE only.

36.

a body travels 12 m long is direction and 10 metres along south and finally 12 m to east find its displacement

Answer»

Answer:

Displament is 12- 10 = 2M

Explanation:

As we now that in DISPLACEMENT we need to KNOW the shortest DISTANCE only.

Discussion

37.	Young's modulus of steel is 1.9 x 1011 2 m4 to (IN = 105 dyne, 1 m² = 104 cm) (A) 1.9 x 1010 (B) 1.9 x 1011 (C) 1.9 x 1012 (D) 1.9 x 1013
Answer»

Discussion

38.	2. Explain why dogs pant during hot summer days using the concept of evaporation?
Answer» ANSWER: MARK BRAINLIST ANSWER Explanation: Explain why DOGS PANT during HOT summer days using the concepts of evaporation? ... Dogs pant during the hot summer days to reduce their internal temperature. When the dogs pant, the water molecules get absorbed from its body and evaporate. Thus, the dogs body gets cooled inside despite of scorching heat.

38.

2. Explain why dogs pant during hot summer days using the concept of evaporation?

Answer»

ANSWER:

MARK BRAINLIST ANSWER

Explanation:

Explain why DOGS PANT during HOT summer days using the concepts of evaporation? ... Dogs pant during the hot summer days to reduce their internal temperature. When the dogs pant, the water molecules get absorbed from its body and evaporate. Thus, the dogs body gets cooled inside despite of scorching heat.

Discussion

39.	Derive E=mc²derive this formula.
Answer» Answer: The DIMENSION of Energy is given by E=M^1L^2T^(-2) Similarly the dimesion of Mass is given by M^1 and that of VELOCITY of light(c) is given by L^1T^(-1). Hence, to get the dimension of Energy, we must have the mass term with power of 1 and the LENGTH and TIKE terms to the power of 2 and (-2) respectively. Squaring the velocity of light satisfies the above condition. Therefore E=mc^2.

39.

Derive E=mc²derive this formula.

Answer»

Answer:

The DIMENSION of Energy is given by

E=M^1L^2T^(-2)

Similarly the dimesion of Mass is given by M^1 and that of VELOCITY of light(c) is given by L^1T^(-1).

Hence, to get the dimension of Energy, we must have the mass term with power of 1 and the LENGTH and TIKE terms to the power of 2 and (-2) respectively. Squaring the velocity of light satisfies the above condition. Therefore E=mc^2.

Discussion

40.	I have doubt in this question
Answer» Answer: not SURE at all but 2 is the CORRECT answer if it HELPS mark me the brainliest

40.

I have doubt in this question

Answer»

Answer:

not SURE at all but 2 is the CORRECT answer

if it HELPS mark me the brainliest

Discussion

41.	Mai nahi abhi revision karo ji tab 85% aa jai gai jab mai parlo gi toh 95 sai aupar aai gai
Answer» ANSWER: hmm vo to h pr ye SIRF SOCH h MERI trah

41.

Mai nahi abhi revision karo ji tab 85% aa jai gai jab mai parlo gi toh 95 sai aupar aai gai

Answer»

ANSWER:

hmm vo to h

pr ye SIRF SOCH h MERI trah

Discussion

42.	Given velocity vector =10√3icap+10jcap m/s. the angle the velocity vector makes with y axis is
Answer» ANSWER: angle with y axis is 60°,,if you LIKE this then TAG this as brain list

42.

Given velocity vector =10√3icap+10jcap m/s. the angle the velocity vector makes with y axis is

Answer»

ANSWER:

angle with y axis is 60°,,if you LIKE this then TAG this as brain list

Discussion

43.	What is resourcesiya yaar gai kya
Answer» ANSWER: resources are th E things that FULL fill the human NEEDS .

43.

What is resourcesiya yaar gai kya

Answer»

ANSWER:

resources are th E things that FULL fill the human NEEDS .

Discussion

44.	What do you mean by power of a lens???? state its SI unit??
Answer» Answer: The SI unit of power is dioptre (D) which is the inverse of the FOCAL LENGTH written in METRE (m). ... This means that the lens is a convex lens since a convex lens has a POSITIVE focal length. If the power of a lens is negative, from FORMULA (1), it inherently means that the focal length of the lens is negative.

44.

What do you mean by power of a lens???? state its SI unit??

Answer»

Answer:

The SI unit of power is dioptre (D) which is the inverse of the FOCAL LENGTH written in METRE (m). ... This means that the lens is a convex lens since a convex lens has a POSITIVE focal length. If the power of a lens is negative, from FORMULA (1), it inherently means that the focal length of the lens is negative.

Discussion

45.	Anyhotcuteromanticgirlfriendformeijd-zfrs-epdthenpleasecomeIwillbebestboyfriend
Answer» ANSWER: ꧁☆ȻᵾŦɆ ǤƗɌŁ ☆꧂ ꧁☆ȻᵾŦɆ ǤƗɌŁ ☆꧂

45.

Anyhotcuteromanticgirlfriendformeijd-zfrs-epdthenpleasecomeIwillbebestboyfriend

Answer»

ANSWER:

꧁☆ȻᵾŦɆ ǤƗɌŁ ☆꧂

Discussion

46.	What is ideal voltmeter? Don't spam.
Answer» Answer: it is a voltmeter whose RESISTANCE is INFINIT. hope it's HELP you

46.

What is ideal voltmeter? Don't spam.

Answer»

Answer:

it is a voltmeter whose RESISTANCE is INFINIT.

hope it's HELP you

Discussion

47.	Explain a mirror and ils Classication. What happens when the incident ray strikes the reflecting surface normally?
Answer» ANSWER: For a PLANE mirror: If the incident ray falls ALONG the normal, the angle of INCIDENCE is 0 degrees, NOT 90 degrees. The angle is measured with the normal to the mirror and not with the plane of the mirror. Hence the angle of reflection is equal to 0 degrees. *please* *mark* me as *brainliest* *answer*

47.

Explain a mirror and ils Classication. What happens when the incident ray strikes the reflecting surface normally?

Answer»

ANSWER:

For a PLANE mirror: If the incident ray falls ALONG the normal, the angle of INCIDENCE is 0 degrees, NOT 90 degrees. The angle is measured with the normal to the mirror and not with the plane of the mirror. Hence the angle of reflection is equal to 0 degrees.

please mark me as brainliest answer

Discussion

48.	A body is covered a distance of 340 kms in 3600 seconds.what is the speed of object
Answer» Answer: $\huge\color{red}\gg{{❥ Answer}}$ To solve for speed or rate USE the formula for speed, s = d/t which means speed equals DISTANCE divided by time. To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

48.

A body is covered a distance of 340 kms in 3600 seconds.what is the speed of object

Answer»

Answer:

$\huge\color{red}\gg{{❥ Answer}}$

To solve for speed or rate USE the formula for speed, s = d/t which means speed equals DISTANCE divided by time. To solve for time use the formula for time, t = d/s which means time equals distance divided by speed.

Discussion

49.	Choose the correct option1. The angle of incidence is the angle between (A) the incident ray and the surface of the mirror (B) the reflected ray and the surface of the mirror (C) the normal to the surface and the incident ray (D) the normal to the surface and the reflected ray 2. The angle of reflection is the angle between(A) the incident ray and the surface of the mirror (B) the reflected ray and the surface of the mirror (C) the normal to the surface and the incident ray(D) the normal to the surface and the reflected ray 3. Light shows: (A) Random propagation (B) Curvilinear propagation(C) Rectilinear propagation (D) None of these 4. A real image is formed when two or more : (A) Reflected rays meet (B) Refracted rays meet (C) Reflected rays appear to meet (D) Both A and B are correct 5. The focal length of a plane mirror is : (A) zero (B) 10 cm (C) 20 m (D) ∞ 6. Which of the following statement is wrong for plane mirrors. (A) They form virtual images (B) They always forminvertedimages(C) Object size = Image size (D) They formlaterally inverted image7. A boy is standing in front of a place mirror at a distance of 3 mfromit. What is the distance between the boy and his image ?(A) 3 m (B) 4.5 m(C) 6 m (D) none of theseFill in the blanks (i) We can not see our image in newspaper because of ………………reflection?(ii) Moon is an example of…………………..source.(iii) Light has …………………….. as well as ……….…………….natureState true or false (i) Laws of reflection are valid only for plane surfaces. (ii) A ray of light retraces its path after reflection in case of normal incidence
Answer» Answer: BRO PURA QUESTION PAPER HI CHAP DIYA TUNE RUK MAIN ANSWER KARTA HU THORI DER ME

49.

Choose the correct option1. The angle of incidence is the angle between (A) the incident ray and the surface of the mirror (B) the reflected ray and the surface of the mirror (C) the normal to the surface and the incident ray (D) the normal to the surface and the reflected ray 2. The angle of reflection is the angle between(A) the incident ray and the surface of the mirror (B) the reflected ray and the surface of the mirror (C) the normal to the surface and the incident ray(D) the normal to the surface and the reflected ray 3. Light shows: (A) Random propagation (B) Curvilinear propagation(C) Rectilinear propagation (D) None of these 4. A real image is formed when two or more : (A) Reflected rays meet (B) Refracted rays meet (C) Reflected rays appear to meet (D) Both A and B are correct 5. The focal length of a plane mirror is : (A) zero (B) 10 cm (C) 20 m (D) ∞ 6. Which of the following statement is wrong for plane mirrors. (A) They form virtual images (B) They always forminvertedimages(C) Object size = Image size (D) They formlaterally inverted image7. A boy is standing in front of a place mirror at a distance of 3 mfromit. What is the distance between the boy and his image ?(A) 3 m (B) 4.5 m(C) 6 m (D) none of theseFill in the blanks (i) We can not see our image in newspaper because of ………………reflection?(ii) Moon is an example of…………………..source.(iii) Light has …………………….. as well as ……….…………….natureState true or false (i) Laws of reflection are valid only for plane surfaces. (ii) A ray of light retraces its path after reflection in case of normal incidence

Answer»

Answer:

BRO PURA QUESTION PAPER HI CHAP DIYA TUNE RUK MAIN ANSWER KARTA HU THORI DER ME

Discussion

50.	An object 2cm tall is placed in front of a concave mirror of radius of curvature 20cm at a distance of 5cm. Find the position, nature and size of the image.
Answer» <U>According to the QUESTION It is given that, Height of object ,ho = 2cm Radius of Curvature ,R = 20cm Object distance ,u = -5cm Type of Mirror = Concave Mirror we have to calculate the position , nature and size of the mirror . Firstly we calculate the focal length of the mirror. f = R/2 ➻ f = 20/2 CM ➻ f = 10cm Now, calculating the image distance . By using Mirror Formula . 1/v + 1/u = 1/f Substitute the value we get ➻ 1/v + 1/-5 = 1/10 ➻ 1/v - 1/5 = 1/10 ➻ 1/v = 1/10 + 1/5 ➻ 1/v = 1+2/10 ➻ 1/v = 3/10 ➻ v = 10/3 = 3.33 cm Hence, the image distance is 10/3 cm from the mirror. Now, calculating the magnification of the mirror m = hi/ho = -v/u ➻ hi/2 = -10/3 × 1/-5 ➻ hi/2 = 2/3 ➻ hi = 4/3 cm Hence, the height of the image is 4/3 cm Nature of Image is Virtual , erect and smaller than the object.

50.

An object 2cm tall is placed in front of a concave mirror of radius of curvature 20cm at a distance of 5cm. Find the position, nature and size of the image.

Answer»

<U>According to the QUESTION

It is given that,

Height of object ,ho = 2cm
Radius of Curvature ,R = 20cm
Object distance ,u = -5cm
Type of Mirror = Concave Mirror

we have to calculate the position , nature and size of the mirror .

Firstly we calculate the focal length of the mirror.

f = R/2

➻ f = 20/2 CM

➻ f = 10cm

Now, calculating the image distance .

By using Mirror Formula .

1/v + 1/u = 1/f

Substitute the value we get

➻ 1/v + 1/-5 = 1/10

➻ 1/v - 1/5 = 1/10

➻ 1/v = 1/10 + 1/5

➻ 1/v = 1+2/10

➻ 1/v = 3/10

➻ v = 10/3 = 3.33 cm

Hence, the image distance is 10/3 cm from the mirror.

Now, calculating the magnification of the mirror

m = hi/ho = -v/u

➻ hi/2 = -10/3 × 1/-5

➻ hi/2 = 2/3

➻ hi = 4/3 cm

Hence, the height of the image is 4/3 cm
Nature of Image is Virtual , erect and smaller than the object.

Discussion

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