67486 + Interview Questions in Secondary School in Physics

1.	How do you experimentally prove that the spring balance
Answer» ANSWER: itna EASY QUESTION koi puchta HAI

1.

How do you experimentally prove that the spring balance

Answer»

ANSWER:

itna EASY QUESTION koi puchta HAI

Discussion

2.	Who discovered plastic?
Answer» Answer: Leo Baekeland The world's first fully synthetic PLASTIC was BAKELITE, invented in NEW York in 1907, by Leo Baekeland who COINED the TERM 'plastics'.

2.

Who discovered plastic?

Answer»

Answer:

Leo Baekeland

The world's first fully synthetic PLASTIC was BAKELITE, invented in NEW York in 1907, by Leo Baekeland who COINED the TERM 'plastics'.

Discussion

3.	1. The incisor tooth is a ____.a. pulleyb. wedge c. screwd. lever
Answer» ANSWER: the INCISOR TOOTH is a WEDGE.

3.

1. The incisor tooth is a ____.a. pulleyb. wedge c. screwd. lever

Answer»

ANSWER:

the INCISOR TOOTH is a WEDGE.

Discussion

4.	If angle of incidence of sound is 60 then it's reflection be?
Answer» It WOULD also be 60° ACCORDING to LAWS of reflection of SOUND

Discussion

5.	Give Formula of time of echo ?
Answer» ANSWER: d=vt/2, where d is DISTANCE , V is VELOCITY and t is TIME

5.

Give Formula of time of echo ?

Answer»

ANSWER:

d=vt/2, where d is DISTANCE , V is VELOCITY and t is TIME

Discussion

6.	2 characteristics of wool
Answer» Explanation: soft ELASTIC FIRE RESISTANT crimp *WARM

6.

2 characteristics of wool

Answer»

Explanation:

*soft

*ELASTIC

*FIRE RESISTANT

*crimp

*WARM

Discussion

7.	9A force acts en a body of mass 5 kg and changes its velocity from m/s to 12 m/s in 4s, and then me of force is(a) 8 N(b) 4N (c) 5N (d) 6 N
Answer» Answer: NEXT TIME ASK question after WRITTING it correctly . Kuchh bhi LIKHA he . 9A force , and me of force . Write correctly first

7.

9A force acts en a body of mass 5 kg and changes its velocity from m/s to 12 m/s in 4s, and then me of force is(a) 8 N(b) 4N (c) 5N (d) 6 N

Answer»

Answer:

NEXT TIME ASK question after WRITTING it correctly .

Kuchh bhi LIKHA he .

9A force , and me of force . Write correctly first

Discussion

8.	The most common trees of Tropical Deciduous Forests are-(b) sal and teak(a) ebony and mahogany(d) oak and chestnut(c) cork and olive
Answer» Answer: SAL teak are the common TREES of TROPICAL DECIDUOUS FOREST .

8.

The most common trees of Tropical Deciduous Forests are-(b) sal and teak(a) ebony and mahogany(d) oak and chestnut(c) cork and olive

Answer»

Answer:

SAL teak are the common TREES of TROPICAL DECIDUOUS FOREST .

Discussion

9.	What is the difference between angle of repose and angle of friction
Answer» EXPLANATION: The major difference is that angle of friction is DEFINED for rigid bodies while angle of repose is defined for granular particles like SAND (Angle of repose). ... Again, angle of repose is a real angle and can be measured directly while angle of friction cannot. *HOPE* IT *HELPS* *YOU!!! PLEASE* *MARK* ME AS A *BRAINLIEST*!!!!!!

9.

What is the difference between angle of repose and angle of friction

Answer»

EXPLANATION:

The major difference is that angle of friction is DEFINED for rigid bodies while angle of repose is defined for granular particles like SAND (Angle of repose). ... Again, angle of repose is a real angle and can be measured directly while angle of friction cannot.

HOPE IT HELPS YOU!!!

PLEASE MARK ME AS A BRAINLIEST!!!!!!

Discussion

10.	Can anyone answer question 2
Answer» ANSWER: We will CONCLUDE that a PERSON is at REST ..

10.

Can anyone answer question 2

Answer»

ANSWER:

We will CONCLUDE that a PERSON is at REST ..

Discussion

11.	3. What will be the resistance of 1000 m long copper wire of radius 1 mm, if the resistivity of copper is 1.72 x 10-22 m ?follow me
Answer» Answer: LENGTH=1 km=1000m Radius=1 mm=110⁻³ m Resistivity of copper=1.72x10⁻⁸ Resistance=(Resistivity of copper Length)/(Area) =(Resistivity of copper * Length)/(r²) Resistance=[1.7210⁻⁸1000]/[22/7(110⁻³)² Resistance=5.5 OHM Hope it helps . I'll follow u , if you MARK me as BRAINLIEST and follow me back . 1st do these I'll SURE follow you .

11.

3. What will be the resistance of 1000 m long copper wire of radius 1 mm, if the resistivity of copper is 1.72 x 10-22 m ?follow me

Answer»

Answer:

LENGTH=1 km=1000m

Radius=1 mm=1*10⁻³ m

Resistivity of copper=1.72x10⁻⁸

Resistance=(Resistivity of copper * Length)/(Area)

=(Resistivity of copper * Length)/(r²)

Resistance=[1.72*10⁻⁸*1000]/[22/7*(1*10⁻³)²

Resistance=5.5 OHM

Hope it helps .

I'll follow u , if you MARK me as BRAINLIEST and follow me back . 1st do these I'll SURE follow you .

Discussion

12.	Short note on current passing through a straight conductor
Answer» ANSWER: there is no STRAIGHT CURRENT i don't know sorry

12.

Short note on current passing through a straight conductor

Answer»

ANSWER:

there is no STRAIGHT CURRENT i

don't know

sorry

Discussion

13.	How is it attainable to place a wire that carries a current in a magnetic field so that there is no force acting on the wire?
Answer» Answer: When the wire is kept PARALLEL or anti parallel to the magnetic field Explanation: F=ILBSin(ALPHA) When, Alpha=0 or 180 Sin(alpha)=0 THEREFORE, F=0

13.

How is it attainable to place a wire that carries a current in a magnetic field so that there is no force acting on the wire?

Answer»

Answer:

When the wire is kept PARALLEL or anti parallel to the magnetic field

Explanation:

F=ILBSin(ALPHA)

When,

Alpha=0 or 180

Sin(alpha)=0

THEREFORE,

F=0

Discussion

14.	Why respiratory problems amongst children are rising day by day.... Give reason
Answer» because most of CHILDREN EATING JUNK FOOD DAILY.

Discussion

15.	What is the current in acurrent in a circuit if the charge passing each is 20C 40s. ?
Answer» ANSWER: HI... CURRENT FLOWING is 0.5 ampere Explanation: current =charge/time 20/40 0.5 ampere hope it HELPS....

15.

What is the current in acurrent in a circuit if the charge passing each is 20C 40s. ?

Answer»

ANSWER:

HI...

CURRENT FLOWING is 0.5 ampere

Explanation:

current =charge/time

20/40

0.5 ampere

hope it HELPS....

Discussion

16.	A swimming pool appears to be 100mdeep. If for water n = 4/3 its real depth is
Answer» ANSWER: APPROX 133.30 Explanation: REAL DEPTH / APPARENT depth = 4/3 rd/100=4/3 rd =(4/3)*100 rd =133.33

16.

A swimming pool appears to be 100mdeep. If for water n = 4/3 its real depth is

Answer»

ANSWER:

APPROX 133.30

Explanation:

REAL DEPTH / APPARENT depth = 4/3

rd/100=4/3

rd =(4/3)*100

rd =133.33

Discussion

17.	Find out the frequency if an object oscillates 20 times in one second
Answer» *PLEASE* *MARK* me *Birlianist* I *HOPE* *this* *ANSWER* *will* *HELP* *you*.

Discussion

18.	Class 8 science difference between metals and nonmetal with give example .....
Answer» Answer: METALS are good conductors of heat and electricity but non-metals are poor conductors of heat and electricity. Metals are ductile in NATURE i.e. it can be DRAWN into thin WIRES. But non-metals are not ductile. Metals are malleable but non-metals are not malleable.

18.

Class 8 science difference between metals and nonmetal with give example .....

Answer»

Answer:

METALS are good conductors of heat and electricity but non-metals are poor conductors of heat and electricity. Metals are ductile in NATURE i.e. it can be DRAWN into thin WIRES. But non-metals are not ductile. Metals are malleable but non-metals are not malleable.

Discussion

19.	What is the variation in acceleration due to gravity with alttitude
Answer» Answer: VARIATION OF g -VARIATION OF ACCELERATION DUE TO GRAVITY We know that the force of gravity varies from PLACE to place on the surface of earth. There are two reasons behind this variation: The shape of earth. The rotation of earth. The earth is not a perfect SPHERE, but bulges at equator. Therefore if a body is taken from pole to equator its distance from the centre of the earth will change. Consequently,the GRAVITATIONAL force also varies. VARIATION OF GRAVITY WITH ALTITUDE Consider the variation of g when a body moves distance UPWARD or downward from the surface of earth. Let g be the value of acceleration due to gravity at the surface of earth and g' at a height h above the surface of earth. If the earth is considered as a sphere of homogeneous composition, then g at any point on the surface of the earth is given.

19.

What is the variation in acceleration due to gravity with alttitude

Answer»

Answer:

VARIATION OF g -VARIATION OF ACCELERATION DUE TO GRAVITY

We know that the force of gravity varies from PLACE to place on the surface of earth.

There are two reasons behind this variation:

The shape of earth.

The rotation of earth.

The earth is not a perfect SPHERE, but bulges at equator. Therefore if a body is taken from pole to equator its distance from the centre of the earth will change. Consequently,the GRAVITATIONAL force also varies.

VARIATION OF GRAVITY WITH ALTITUDE

Consider the variation of g when a body moves distance UPWARD or downward from the surface of earth.

Let g be the value of acceleration due to gravity at the surface of earth and g' at a height h above the surface of earth.

If the earth is considered as a sphere of homogeneous composition, then g at any point on the surface of the earth is given.

Discussion

20.	V is image distance know ?
Answer» What??? INCOMPLETE QUESTION

20.

V is image distance know ?

Answer»

What???

INCOMPLETE QUESTION

Discussion

21.	Two identical bodies having charges +25 micro coulomb and -25 micro coulomb are brought in touch and then seprated. What will be the charges on bodies after sepration
Answer» Answer : $\implies \boxed{ \blue{charge \: on \: bodies \: after \: seperted \: will \: be \: 0}}$

21.

Two identical bodies having charges +25 micro coulomb and -25 micro coulomb are brought in touch and then seprated. What will be the charges on bodies after sepration

Answer»

Answer :

$\implies \boxed{ \blue{charge \: on \: bodies \: after \: seperted \: will \: be \: 0}}$

Discussion

22.	What is Definition of inertia and si unit
Answer» Answer: Inertia- a tendency to do nothing or to remain unchanged. SI Unit- a system of PHYSICAL units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and MOLE, TOGETHER with a set of prefixes to indicate multiplication or DIVISION by a power of TEN.

22.

What is Definition of inertia and si unit

Answer»

Answer:

Inertia- a tendency to do nothing or to remain unchanged.

SI Unit- a system of PHYSICAL units ( SI units ) based on the metre, kilogram, second, ampere, kelvin, candela, and MOLE, TOGETHER with a set of prefixes to indicate multiplication or DIVISION by a power of TEN.

Discussion

23.	Find the power of the eye lens when ciliary muscles are (1)fully relaxed(2)in their maximum contract position
Answer» Answer: 1. The power is ZERO and eye-lens is thin when CILIARY muscles of the eye are in their most relaxed state. 2. When the ciliary muscles contract, they LOOSEN the ciliary fibers which are attached to the envelope of the crystalline lens. Because the lens is pliable, it relaxes into a more CURVES shape, INCREASING it's refractive power to accommodate for closer viewing. Hope it will help....

23.

Find the power of the eye lens when ciliary muscles are (1)fully relaxed(2)in their maximum contract position

Answer»

Answer:

1. The power is ZERO and eye-lens is thin when CILIARY muscles of the eye are in their most relaxed state.

2. When the ciliary muscles contract, they LOOSEN the ciliary fibers which are attached to the envelope of the crystalline lens. Because the lens is pliable, it relaxes into a more CURVES shape, INCREASING it's refractive power to accommodate for closer viewing.

Hope it will help....

Discussion

24.	If 10 N of force os being applied by a rectangular block measuring 5cm by 2cm by 1cm on a table then find the pressure exerted by the block when it os placed in position of L by B and B by H and L by H
Answer» ANSWER: in POSITION, L by H p=10000pa, B by h pressure=50000pa l by h pressure=20000pa

24.

If 10 N of force os being applied by a rectangular block measuring 5cm by 2cm by 1cm on a table then find the pressure exerted by the block when it os placed in position of L by B and B by H and L by H

Answer»

ANSWER:

in POSITION, L by H p=10000pa,

B by h pressure=50000pa

l by h pressure=20000pa

Discussion

25.	The speed of three molecules equals 20m/s. If the speed of the first two molecules are 15 m/s and 25 m/s . What is speed of the third molecule
Answer» ANSWER: (25+15+x)/3 =20 25+15+x=60 x=60-40 x=20 the RIGHT answer is 20m/s

25.

The speed of three molecules equals 20m/s. If the speed of the first two molecules are 15 m/s and 25 m/s . What is speed of the third molecule

Answer»

ANSWER:

(25+15+x)/3 =20

25+15+x=60

x=60-40

x=20

the RIGHT answer is 20m/s

Discussion

26.	1. The frequency of a source of sound is 200 Hz. How many times does it vibrate in 2 min?(a)2400(b) 24000(c) 24500(d) 2450
Answer» ANSWER: The ANSER is (a) 2400 Hope U LIKE it

26.

1. The frequency of a source of sound is 200 Hz. How many times does it vibrate in 2 min?(a)2400(b) 24000(c) 24500(d) 2450

Answer»

ANSWER:

The ANSER is

(a) 2400

Hope U LIKE it

Discussion

27.	A body of mass m starts from rest with a constantpower. If velocity of the body at displacements s is v, then the correct relation is
Answer» Answer: Given: Mass = m Body starts from rest with a constant power p. VELOCITY at displacement s = v To find: Correct relationship Concept: ACCELERATION can be written as follows : $\boxed{acc. = v \times \dfrac{dv}{dx}}$ CALCULATION: Power = Force × Velocity $= > p = f \times v$ $= > p = (m \times acc.) \times v$ $= > p = (m \times v \times \dfrac{dv}{dx} ) \times v$ $= > p = m {v}^{2} ( \dfrac{dv}{dx})$ $= > dx =( \dfrac{m}{p} ) \times {v}^{2} dv$ INTEGRATION on both sides: $= > \int dx =( \dfrac{m}{p} ) \times \int{v}^{2} dv$ Taking limits on integration : $= > \int_{0}^{s} dx =( \dfrac{m}{p} ) \times \int_{0}^{v}{v}^{2} dv$ $= > s = \dfrac{m}{p} \times \dfrac{ {v}^{3} }{3}$ $= > s = \dfrac{m {v}^{3} }{3p}$ So final answer : $\boxed{\large{ \red{s = \dfrac{m {v}^{3} }{3p}}}}$

27.

A body of mass m starts from rest with a constantpower. If velocity of the body at displacements s is v, then the correct relation is

Answer»

Answer:

Given:

Mass = m

Body starts from rest with a constant power p. VELOCITY at displacement s = v

To find:

Correct relationship

Concept:

ACCELERATION can be written as follows :

$\boxed{acc. = v \times \dfrac{dv}{dx}}$

CALCULATION:

Power = Force × Velocity

$= > p = f \times v$

$= > p = (m \times acc.) \times v$

$= > p = (m \times v \times \dfrac{dv}{dx} ) \times v$

$= > p = m {v}^{2} ( \dfrac{dv}{dx})$

$= > dx =( \dfrac{m}{p} ) \times {v}^{2} dv$

INTEGRATION on both sides:

$= > \int dx =( \dfrac{m}{p} ) \times \int{v}^{2} dv$

Taking limits on integration :

$= > \int_{0}^{s} dx =( \dfrac{m}{p} ) \times \int_{0}^{v}{v}^{2} dv$

$= > s = \dfrac{m}{p} \times \dfrac{ {v}^{3} }{3}$

$= > s = \dfrac{m {v}^{3} }{3p}$

So final answer :

$\boxed{\large{ \red{s = \dfrac{m {v}^{3} }{3p}}}}$

Discussion

28.	The horizontal and vertical displacement of a projectile line are given by X is equals to 20 -
Answer» ANSWER: V=√(a^+b^)...(^=SQUARE)

28.

The horizontal and vertical displacement of a projectile line are given by X is equals to 20 -

Answer»

ANSWER:

V=√(a^+b^)...(^=SQUARE)

Discussion

29.	An object is placed in front of a concave mirror of focal length 15cm and its inverted sharp image of height 6cm is observed at a distance of 37.5cm from the mirror find out object distance and its height
Answer» *PLEASE* *MARK* me *Birlianist* I *HOPE* *this* *ANSWER* *will* *HELP* *you*.

Discussion

30.	Formula to find pitch of screw guage
Answer» Explanation: FIND the distance moved on the MAIN scale by the thimble (it will be EITHER 10–9=1 cm or 11–10=1 cm) and divide it be the no. of revolutions of the thimble (in this case it is 1). It will give you the PITCH.

30.

Formula to find pitch of screw guage

Answer»

Explanation:

FIND the distance moved on the MAIN scale by the thimble (it will be EITHER 10–9=1 cm or 11–10=1 cm) and divide it be the no. of revolutions of the thimble (in this case it is 1). It will give you the PITCH.

Discussion

31.	Write the condition essential for rusting of iron
Answer» EXPLANATION: ※The presence of water and OXYGEN is essential for the RUSTING of iron. ※Impurities in the iron, the presence of water vapor, acids, SALTS and carbon dioxide hastens rusting. ※Pure iron does not rust in dry and carbon dioxide free AIR.

31.

Write the condition essential for rusting of iron

Answer»

EXPLANATION:

※The presence of water and OXYGEN is essential for the RUSTING of iron.

※Impurities in the iron, the presence of water vapor, acids, SALTS and carbon dioxide hastens rusting.

※Pure iron does not rust in dry and carbon dioxide free AIR.

Discussion

32.	What's meant by the upthrust
Answer» Explanation: UPTHRUST : the upward force that a liquid or gas EXERTS on a BODY FLOATING in it.

32.

What's meant by the upthrust

Answer»

Explanation:

UPTHRUST : the upward force that a liquid or gas EXERTS on a BODY FLOATING in it.

Discussion

33.	What is galvanometer
Answer» Answer: galvanometer is an electromechanical instrument used for DETECTING and indicating an electric current. A galvanometer works as an actuator, by PRODUCING a rotary deflection (of a "pointer"), in response to electric current flowing through a coil in a constant magnetic field. Early galvanometers were not calibrated, but their LATER developments were used as measuring instruments, called ammeters, to measure the current flowing through an electric circuit. Galvanometers developed from the observation that the needle of a magnetic compass is deflected near a wire that has electric current flowing through it, first described by Hans Christian Ørsted in 1820. They were the first instruments used to detect and measure small amounts of electric currents. André-Marie Ampère, who gave mathematical expression to Ørsted's discovery and named the instrument after[1] the ITALIAN electricity researcher Luigi Galvani, who in 1791 discovered the principle of the frog galvanoscop Sensitive galvanometers have been essential for the development of science and technology in many fields. For example, in the 1800s they enabled long range communication through submarine cables, such as the earliest transatlantic telegraph cables, and were essential to discovering the electrical activity of the HEART and brain, by their fine measurements of current. Explanation: Mark as brain list plssss

33.

What is galvanometer

Answer»

Answer:

galvanometer is an electromechanical instrument used for DETECTING and indicating an electric current. A galvanometer works as an actuator, by PRODUCING a rotary deflection (of a "pointer"), in response to electric current flowing through a coil in a constant magnetic field. Early galvanometers were not calibrated, but their LATER developments were used as measuring instruments, called ammeters, to measure the current flowing through an electric circuit.

Galvanometers developed from the observation that the needle of a magnetic compass is deflected near a wire that has electric current flowing through it, first described by Hans Christian Ørsted in 1820. They were the first instruments used to detect and measure small amounts of electric currents. André-Marie Ampère, who gave mathematical expression to Ørsted's discovery and named the instrument after[1] the ITALIAN electricity researcher Luigi Galvani, who in 1791 discovered the principle of the frog galvanoscop

Sensitive galvanometers have been essential for the development of science and technology in many fields. For example, in the 1800s they enabled long range communication through submarine cables, such as the earliest transatlantic telegraph cables, and were essential to discovering the electrical activity of the HEART and brain, by their fine measurements of current.

Explanation:

Mark as brain list plssss

Discussion

34.	Why cannot a single silk fibre form a thread?
Answer» Explanation: single SILK fibre cannot form a thread because it is very THIN and frail. if we MAKE CLOTH from that fibre the cloth made of it will tear easily.. mark as BRAINLIST......

34.

Why cannot a single silk fibre form a thread?

Answer»

Explanation:

single SILK fibre cannot form a thread because it is very THIN and frail. if we MAKE CLOTH from that fibre the cloth made of it will tear easily..

mark as BRAINLIST......

Discussion

35.	Discuss Doppler Effect. Write expression for new frequency when the object and source approach each other. Discuss all cases.
Answer» EXPLANATION: The Doppler effect (or the Doppler shift) is the change in FREQUENCY of a WAVE in relation to an OBSERVER who is MOVING relative to the wave source. ... Hence, the time between the arrivals of successive wave crests at the observer is reduced, causing an increase in the frequency.

35.

Discuss Doppler Effect. Write expression for new frequency when the object and source approach each other. Discuss all cases.

Answer»

EXPLANATION:

The Doppler effect (or the Doppler shift) is the change in FREQUENCY of a WAVE in relation to an OBSERVER who is MOVING relative to the wave source. ... Hence, the time between the arrivals of successive wave crests at the observer is reduced, causing an increase in the frequency.

Discussion

36.	State and derive an equation for the law of conservation of momentum
Answer» ANSWER: P=mv Explanation: Conservation of momentum is a fundamental LAW of physics which states that the momentum of a SYSTEM is CONSTANT if there are no external forces acting on the system. It is embodied in Newton's first law (the law of inertia).

36.

State and derive an equation for the law of conservation of momentum

Answer»

ANSWER:

P=mv

Explanation:

Conservation of momentum is a fundamental LAW of physics which states that the momentum of a SYSTEM is CONSTANT if there are no external forces acting on the system. It is embodied in Newton's first law (the law of inertia).

Discussion

37.	Define escape velocity of a satellite
Answer» Answer: heyy MATE!! According to the law On the surface of the Earth, the ESCAPE velocity is about 11.2 km/s, which is approximately 33 times the speed of sound (MACH 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). However, at 9,000 km ALTITUDE in "SPACE", it is slightly less than 7.1 km/s. hope u found it useful!!

37.

Define escape velocity of a satellite

Answer»

Answer:

heyy MATE!!

According to the law On the surface of the Earth, the ESCAPE velocity is about 11.2 km/s, which is approximately 33 times the speed of sound (MACH 33) and several times the muzzle velocity of a rifle bullet (up to 1.7 km/s). However, at 9,000 km ALTITUDE in "SPACE", it is slightly less than 7.1 km/s.

hope u found it useful!!

Discussion

38.	What is the molar mass of a gas which has a density of 1.30 g/L measured at 27 degree Celsius and 0.4 atmosphere
Answer» ANSWER: G fsaldkgnah chhas Explanation:

38.

What is the molar mass of a gas which has a density of 1.30 g/L measured at 27 degree Celsius and 0.4 atmosphere

Answer»

ANSWER:

G fsaldkgnah chhas

Explanation:

Discussion

39.	A pendulum completes 16 oscillations in 0.5 seconds .calculate frequency of the pendulum?a 8 hertzb 16 hertz c 32 hertzd 64 hertz
Answer» ANSWER:C 32 hz Explanation:MULTIPLY with 2

39.

A pendulum completes 16 oscillations in 0.5 seconds .calculate frequency of the pendulum?a 8 hertzb 16 hertz c 32 hertzd 64 hertz

Answer»

ANSWER:C

32 hz

Explanation:MULTIPLY with

2

Discussion

40.	Expression for the escape velocity of a body from the surface of the earth
Answer» Answer: To find: Escape VELOCITY of an object from the earth surface . Concept: Escape velocity is that velocity with which a particle when projected, goes out of the gravitational PULL of a planet (i.e. infinity ) And we have to find the minimum velocity to do so. So on REACHING infinity, both kinetic and Potential energy will be zero. Calculation: So we will be applying Conservation Of Mechanical Energy theorem. Let escape Velocity be v , mass of object be m , mass of Earth be M ,and radius be r. $\therefore \: ke1 + pe1 = ke2 + pe2$ $= > \dfrac{1}{2} m {v}^{2} + ( - \dfrac{gmM}{ r } ) = 0 + 0$ $= > \dfrac{1}{2} m {v}^{2} = \dfrac{gmM}{r}$ $= > {v}^{2} = \dfrac{2gM}{r}$ $= > v = \sqrt{ \dfrac{2gM}{r} }$ So from this Equation, we can clearly understand that escape velocity is not DEPENDENT on the mass of the object. So final answer : $\boxed{ \red{ v \: esc.= \sqrt{ \dfrac{2gM}{r} }}}$

40.

Expression for the escape velocity of a body from the surface of the earth

Answer»

Answer:

To find:

Escape VELOCITY of an object from the earth surface .

Concept:

Escape velocity is that velocity with which a particle when projected, goes out of the gravitational PULL of a planet

(i.e. infinity )

And we have to find the minimum velocity to do so.

So on REACHING infinity, both kinetic and Potential energy will be zero.

Calculation:

So we will be applying Conservation Of Mechanical Energy theorem.

Let escape Velocity be v , mass of object be m , mass of Earth be M ,and radius be r.

$\therefore \: ke1 + pe1 = ke2 + pe2$

$= > \dfrac{1}{2} m {v}^{2} + ( - \dfrac{gmM}{ r } ) = 0 + 0$

$= > \dfrac{1}{2} m {v}^{2} = \dfrac{gmM}{r}$

$= > {v}^{2} = \dfrac{2gM}{r}$

$= > v = \sqrt{ \dfrac{2gM}{r} }$

So from this Equation, we can clearly understand that escape velocity is not DEPENDENT on the mass of the object.

So final answer :

$\boxed{ \red{ v \: esc.= \sqrt{ \dfrac{2gM}{r} }}}$

Discussion

41.	Electric current flows through a circular loop on a horizontal table in anti clock wise direction. What will be the direction of the magnetic field 1)at a point inside the loop and 2) at a point outside the loop
Answer» ANSWER: at a POINT INSIDE the direction of the MAGNETIC FIELD.

41.

Electric current flows through a circular loop on a horizontal table in anti clock wise direction. What will be the direction of the magnetic field 1)at a point inside the loop and 2) at a point outside the loop

Answer»

ANSWER:

at a POINT INSIDE the direction of the MAGNETIC FIELD.

Discussion

42.	1.A force F (21 - j + 4k) N displaces a particle uptod = (31 +23 - k)m, calculate work done.(1) Zero (2) 8 J (3) 4J (4) 12 J
Answer» I HOPE this ANSWER will HELP you. PLEASE MARK me Birlianist.

Discussion

43.	Writa down the law of reflection of light?
Answer» $\large \green{ \Downarrow \bf Law \: of \: Reflection \: \Downarrow}$ 1. The incident RAY , the reflected ray and the NORMAL all lies in same plane . 2. According to this Laws the angle of incident ray is ALWAYS equals to the angle of Reflected ray. $\large \boxed{ \blue{ \bf \angle i = \angle r}}$

43.

Writa down the law of reflection of light?

Answer»

$\large \green{ \Downarrow \bf Law \: of \: Reflection \: \Downarrow}$

1. The incident RAY , the reflected ray and the NORMAL all lies in same plane .

2. According to this Laws the angle of incident ray is ALWAYS equals to the angle of Reflected ray.

$\large \boxed{ \blue{ \bf \angle i = \angle r}}$

Discussion

44.	Define electric current and write it's equation
Answer» ANSWER: the RATE of flow of ELECTRIC charge is KNOWN as electric current. I = V/R...

44.

Define electric current and write it's equation

Answer»

ANSWER:

the RATE of flow of ELECTRIC charge is KNOWN as electric current.

I = V/R...

Discussion

45.	Is mass of alpha particle less than neutron
Answer» Explanation: aslam alekum❤❤ no ALPHA PARTICLES are at other pace and neutrons are less than alpha particles....hope it will help you .mark this answer as brainlist if you want to

45.

Is mass of alpha particle less than neutron

Answer»

Explanation:

aslam alekum❤❤

no ALPHA PARTICLES are at other pace and neutrons are less than alpha particles....hope it will help you .mark this answer as brainlist if you want to

Discussion

46.	Write down the law of reflection of light?
Answer» ANSWER: ANGLE of incident = Angle of reflection All angles lie on the same plane at the POINT of incident Explanation: I hope it helps you...

46.

Write down the law of reflection of light?

Answer»

ANSWER:

ANGLE of incident = Angle of reflection

All angles lie on the same plane at the POINT of incident

Explanation:

I hope it helps you...

Discussion

47.	A force of 100N acts on two blocks A and B of masses 2kg and 3 kg respectively, placed in contact on a smooth horizontal surface. what is the magnitude of force which block A exerts on block B
Answer» ANSWER: hiihiiiihhiiiiihiiiii

47.

A force of 100N acts on two blocks A and B of masses 2kg and 3 kg respectively, placed in contact on a smooth horizontal surface. what is the magnitude of force which block A exerts on block B

Answer»

ANSWER:

hiihiiiihhiiiiihiiiii

Discussion

48.	In vaccum, the speed of light does not depend upon the frequency of light. ( true or false)
Answer» I THINK Its TRUE......

Discussion

49.	What will happen if a convex mirror is used in the experiment shown in image
Answer» ANSWER: HI MATE.... Explanation: IF WE KEEP CONVEX MIRROR IN FRONT OF THE SUN IT WILL NOT BURN IN THE SENSE THAT IT IS NOT A BUDGING MIRROR THAT IS ALL I CAN UNDERSTAND HOPE IT HELPS

49.

What will happen if a convex mirror is used in the experiment shown in image

Answer»

ANSWER:

HI MATE....

Explanation:

IF WE KEEP CONVEX MIRROR IN FRONT OF THE SUN IT WILL NOT BURN IN THE SENSE THAT IT IS NOT A BUDGING MIRROR

THAT IS ALL I CAN UNDERSTAND

HOPE IT HELPS

Discussion

50.	A copper wire is connected to the circuit instead of an aluminum wire, which has the same thickness of 2 meters. What's the length of the copper wire, if it's resistance is the same size?
Answer» EXPLANATION: the LENGTH of the COPPER WIRE will same as that of ALUMINIUM wire

50.

A copper wire is connected to the circuit instead of an aluminum wire, which has the same thickness of 2 meters. What's the length of the copper wire, if it's resistance is the same size?

Answer»

EXPLANATION:

the LENGTH of the COPPER WIRE will same as that of ALUMINIUM wire

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How do you experimentally prove that the spring balance

Who discovered plastic?​

1. The incisor tooth is a ____.a. pulleyb. wedge c. screwd. lever​

If angle of incidence of sound is 60 then it's reflection be?

Give Formula of time of echo ?

2 characteristics of wool​

9A force acts en a body of mass 5 kg and changes its velocity from m/s to 12 m/s in 4s, and then me of force is(a) 8 N(b) 4N (c) 5N (d) 6 N​

The most common trees of Tropical Deciduous Forests are-(b) sal and teak(a) ebony and mahogany(d) oak and chestnut(c) cork and olive​

What is the difference between angle of repose and angle of friction​

HOPE IT HELPS YOU!!!

Can anyone answer question 2

3. What will be the resistance of 1000 m long copper wire of radius 1 mm, if the resistivity of copper is 1.72 x 10-22 m ?follow me​

Short note on current passing through a straight conductor

How is it attainable to place a wire that carries a current in a magnetic field so that there is no force acting on the wire?

Why respiratory problems amongst children are rising day by day.... Give reason

What is the current in acurrent in a circuit if the charge passing each is 20C 40s. ?​

A swimming pool appears to be 100mdeep. If for water n = 4/3 its real depth is​

Find out the frequency if an object oscillates 20 times in one second

PLEASE MARK me Birlianist I HOPE this ANSWER will HELP you.

Class 8 science difference between metals and nonmetal with give example .....​

What is the variation in acceleration due to gravity with alttitude​

V is image distance know ?

What???

INCOMPLETE QUESTION

Two identical bodies having charges +25 micro coulomb and -25 micro coulomb are brought in touch and then seprated. What will be the charges on bodies after sepration

What is Definition of inertia and si unit

Find the power of the eye lens when ciliary muscles are (1)fully relaxed(2)in their maximum contract position

If 10 N of force os being applied by a rectangular block measuring 5cm by 2cm by 1cm on a table then find the pressure exerted by the block when it os placed in position of L by B and B by H and L by H

The speed of three molecules equals 20m/s. If the speed of the first two molecules are 15 m/s and 25 m/s . What is speed of the third molecule

1. The frequency of a source of sound is 200 Hz. How many times does it vibrate in 2 min?(a)2400(b) 24000(c) 24500(d) 2450​

A body of mass m starts from rest with a constantpower. If velocity of the body at displacements s is v, then the correct relation is​

Given:

To find:

Concept:

CALCULATION:

The horizontal and vertical displacement of a projectile line are given by X is equals to 20 -

An object is placed in front of a concave mirror of focal length 15cm and its inverted sharp image of height 6cm is observed at a distance of 37.5cm from the mirror find out object distance and its height

PLEASE MARK me Birlianist I HOPE this ANSWER will HELP you.

Formula to find pitch of screw guage

Write the condition essential for rusting of iron

What's meant by the upthrust

What is galvanometer​

Why cannot a single silk fibre form a thread? ​

Discuss Doppler Effect. Write expression for new frequency when the object and source approach each other. Discuss all cases.​

State and derive an equation for the law of conservation of momentum

Define escape velocity of a satellite​

What is the molar mass of a gas which has a density of 1.30 g/L measured at 27 degree Celsius and 0.4 atmosphere

A pendulum completes 16 oscillations in 0.5 seconds .calculate frequency of the pendulum?a 8 hertzb 16 hertz c 32 hertzd 64 hertz

Expression for the escape velocity of a body from the surface of the earth

Answer:

To find:

Concept:

Calculation:

Electric current flows through a circular loop on a horizontal table in anti clock wise direction. What will be the direction of the magnetic field 1)at a point inside the loop and 2) at a point outside the loop

1.A force F (21 - j + 4k) N displaces a particle uptod = (31 +23 - k)m, calculate work done.(1) Zero (2) 8 J (3) 4J (4) 12 J​

I HOPE this ANSWER will HELP you. PLEASE MARK me Birlianist.

Writa down the law of reflection of light?​

1. The incident RAY , the reflected ray and the NORMAL all lies in same plane .

2. According to this Laws the angle of incident ray is ALWAYS equals to the angle of Reflected ray.

Define electric current and write it's equation​

Is mass of alpha particle less than neutron​

Write down the law of reflection of light?​

I hope it helps you...

A force of 100N acts on two blocks A and B of masses 2kg and 3 kg respectively, placed in contact on a smooth horizontal surface. what is the magnitude of force which block A exerts on block B​

In vaccum, the speed of light does not depend upon the frequency of light. ( true or false)

I THINK Its TRUE......

What will happen if a convex mirror is used in the experiment shown in image

A copper wire is connected to the circuit instead of an aluminum wire, which has the same thickness of 2 meters. What's the length of the copper wire, if it's resistance is the same size?

Who discovered plastic?

1. The incisor tooth is a ____.a. pulleyb. wedge c. screwd. lever

2 characteristics of wool

9A force acts en a body of mass 5 kg and changes its velocity from m/s to 12 m/s in 4s, and then me of force is(a) 8 N(b) 4N (c) 5N (d) 6 N

The most common trees of Tropical Deciduous Forests are-(b) sal and teak(a) ebony and mahogany(d) oak and chestnut(c) cork and olive

What is the difference between angle of repose and angle of friction

3. What will be the resistance of 1000 m long copper wire of radius 1 mm, if the resistivity of copper is 1.72 x 10-22 m ?follow me

What is the current in acurrent in a circuit if the charge passing each is 20C 40s. ?

A swimming pool appears to be 100mdeep. If for water n = 4/3 its real depth is

Class 8 science difference between metals and nonmetal with give example .....

What is the variation in acceleration due to gravity with alttitude

1. The frequency of a source of sound is 200 Hz. How many times does it vibrate in 2 min?(a)2400(b) 24000(c) 24500(d) 2450

A body of mass m starts from rest with a constantpower. If velocity of the body at displacements s is v, then the correct relation is

What is galvanometer

Why cannot a single silk fibre form a thread?

Discuss Doppler Effect. Write expression for new frequency when the object and source approach each other. Discuss all cases.

Define escape velocity of a satellite

1.A force F (21 - j + 4k) N displaces a particle uptod = (31 +23 - k)m, calculate work done.(1) Zero (2) 8 J (3) 4J (4) 12 J

Writa down the law of reflection of light?

Define electric current and write it's equation

Is mass of alpha particle less than neutron

Write down the law of reflection of light?

A force of 100N acts on two blocks A and B of masses 2kg and 3 kg respectively, placed in contact on a smooth horizontal surface. what is the magnitude of force which block A exerts on block B