67486 + Interview Questions in Secondary School in Physics

1.	How does the application of brakes o n a car affect its velocity
Answer» If BREAK is APPLIED the FINAL VELOCITY will be 0

Discussion

2.	Identify the substances that are oxidized and the substances that are reduced in the follow(a) Zno - Zn+co(b) Mno, + 4HCI - MOCI2, + 2H2,O.CI2,(m) 2FeCl3 + H2S - 2FCI2,+S+ 2HCI(d) 3Mg + N2, Mg3,N2,
Answer» Answer: the SUBSTANCE that has been OXIDIZED is C and reduced is Zn b) the substance that has been oxidized here is M ND reduced is n C) the substance that has been oxidized here is NOTHING nd reduced is also nothing d) here too no substance is oxidized nd reduced

2.

Identify the substances that are oxidized and the substances that are reduced in the follow(a) Zno - Zn+co(b) Mno, + 4HCI - MOCI2, + 2H2,O.CI2,(m) 2FeCl3 + H2S - 2FCI2,+S+ 2HCI(d) 3Mg + N2, Mg3,N2,

Answer»

Answer:

the SUBSTANCE that has been OXIDIZED is C and reduced is Zn

b) the substance that has been oxidized here is M ND reduced is n

C) the substance that has been oxidized here is NOTHING nd reduced is also nothing

d) here too no substance is oxidized nd reduced

Discussion

3.	An object sem in size is placed at 25cm infront of a concave mirror of focal length 10 cmat what distance from the mirror would aScreen be placed in order to obtain a shortimages find the nature and size of the image.
Answer» Answer: focal length = f = 10 cm object distance = U = 25 cm image distance = V = ? Explanation: Mirror formula, 1/f=1/v+1/u 1/v=1/f+1/u Apply sign convention 1/v=1/f+(-1/u) 1/v=1/f-1/u 1/v=1/10-1/25 1/v=(10-25)/(1025) v=(-15)/(1025) v=-15/250=-3/50 -3/50=-0.06 v=0.06cm At the distance of 0.06 cm from the the mirror , the screen should be placed in order to obtain short image Highly diminished,inverted

3.

An object sem in size is placed at 25cm infront of a concave mirror of focal length 10 cmat what distance from the mirror would aScreen be placed in order to obtain a shortimages find the nature and size of the image.

Answer»

Answer:

focal length = f = 10 cm

object distance = U = 25 cm

image distance = V = ?

Explanation:

Mirror formula,

1/f=1/v+1/u

1/v=1/f+1/u

Apply sign convention

1/v=1/f+(-1/u)

1/v=1/f-1/u

1/v=1/10-1/25

1/v=(10-25)/(10*25)

v=(-15)/(10*25)

v=-15/250=-3/50

-3/50=-0.06

v=0.06cm

At the distance of 0.06 cm from the the mirror , the screen should be placed in order to obtain short image

Highly diminished,inverted

Discussion

4.	A bulb is rated at 330V-110W. what do you think is its resistence? three such bulbs burn for 5 hrs at a stretch. what is the energy consumed? calculate the cost in rupees if the rate is 70 paise per unit
Answer» we know that for an electric appliance P = V2/R or resistance will be given as R = V2 / P So, P = 110w V = 330 volts R = 3302 / 110 = 108,900/110 = 990 thus, resistance of the BULB is 990 now, electric energy consumed will be E = number of units x POWER of each unit x time = N x P x t n = 3 P = 110 W t = 5 hours so, E = 3 x 110 × 5 thus, E = 1650Wh .. the total cost of electricity = total unit of energy consumed x cost per unit = 1650 x 0.7 Rs thus, total cost= 1155rs. and monthly cost = total daily cost x number of DAYS in month = 1155rs. × 30 = 34,650rs. hope this will HELP...

4.

A bulb is rated at 330V-110W. what do you think is its resistence? three such bulbs burn for 5 hrs at a stretch. what is the energy consumed? calculate the cost in rupees if the rate is 70 paise per unit

Answer»

we know that for an electric appliance

P = V2/R

or resistance will be given as R = V2 / P

So,

P = 110w

V = 330 volts

R = 3302 / 110

= 108,900/110 = 990

thus, resistance of the BULB is 990

now, electric energy consumed will be

E = number of units x POWER of each unit x time = N x P x t

n = 3

P = 110 W

t = 5 hours

so,

E = 3 x 110 × 5

thus,

E = 1650Wh

..

the total cost of electricity = total unit of energy consumed x cost per unit

= 1650 x 0.7 Rs

thus,

total cost= 1155rs.

and

monthly cost = total daily cost x number of DAYS in month

=

1155rs. × 30 = 34,650rs.

hope this will HELP...

Discussion

5.	a car accelerates uniformly 18 km per hour to 30 km per hour in 5 seconds calculate its acceleration and distance covered
Answer» Answer: 2.4 accleration 6km distance Explanation: BCOZ for ACCELERATION is change in VELOCITY by TIME taken distance is equal to velocity by time #that's it#

5.

a car accelerates uniformly 18 km per hour to 30 km per hour in 5 seconds calculate its acceleration and distance covered

Answer»

Answer:

2.4 accleration

6km distance

Explanation:

BCOZ for ACCELERATION is change in VELOCITY by TIME taken

distance is equal to velocity by time

#that's it#

Discussion

6.	Name a physical quantity that (i) varies (ii) remains same in a circular motion.
Answer» I don't KNOW this ANSWER

Discussion

7.	How to find mean resistance
Answer» Answer: Add all of the resistances across the circuit together to calculate the total resistance. If you don't know the INDIVIDUAL values, use the OHM's Law equation, where resistance = VOLTAGE divided by CURRENT. Plug in the values for voltage and current and solve for R to get the total resistance in a circuit. Explanation: mark BRAILIEST

7.

How to find mean resistance

Answer»

Answer:

Add all of the resistances across the circuit together to calculate the total resistance. If you don't know the INDIVIDUAL values, use the OHM's Law equation, where resistance = VOLTAGE divided by CURRENT. Plug in the values for voltage and current and solve for R to get the total resistance in a circuit.

Explanation:

mark BRAILIEST

Discussion

8.	Ii) how to find? can any one help
Answer» Answer: 1.As you can see the effective resistance is 9/2 . because two 9 ohm resistances are in parallel. so by using ohms LAW V=IR we get I = 9/4.5= 2 ampere. 2. for potential diff across 5 ohms it will be (current in the SECOND branch × 5 ) the current in both branches is identical since there are identical resistance in both branch . current in an branch= 1 ampere. so potential diff across 5 ohm resistance is= 1×5 = 5 volts. hope you like the solution.

8.

Ii) how to find? can any one help

Answer»

Answer:

1.As you can see the effective resistance is 9/2 . because two 9 ohm resistances are in parallel.

so by using ohms LAW V=IR

we get I = 9/4.5= 2 ampere.

2. for potential diff across 5 ohms it will be (current in the SECOND branch × 5 )

the current in both branches is identical since there are identical resistance in both branch . current in an branch= 1 ampere.

so potential diff across 5 ohm resistance is= 1×5 = 5 volts.

hope you like the solution.

Discussion

9.	Can theaverage speed of a moving body is zero give reason
Answer» YES ,it can be as if the displacement is ZERO then the SPEED will also be zero as speed =displacement or DISTANCE upon time so

Discussion

10.	A train covers 80 km in 2 hours. Find Its average speed in kmh'', m min and ms"
Answer» ANSWER: NA bera Explanation: ORA dhore puchle

10.

A train covers 80 km in 2 hours. Find Its average speed in kmh'', m min and ms"

Answer»

ANSWER:

NA bera

Explanation:

ORA dhore puchle

Discussion

11.	2:21. If error in measurement of radius of sphere is 1%,what will be the error in measurement of volume?(a) 1%(b) 1/3 %le 29a) 10 % (A.F.MC. 2005)
Answer» ANSWER:V =4/3πr^3 ∆v=3∆r 3×1% =3% EXPLANATION:

11.

2:21. If error in measurement of radius of sphere is 1%,what will be the error in measurement of volume?(a) 1%(b) 1/3 %le 29a) 10 % (A.F.MC. 2005)

Answer»

ANSWER:V =4/3πr^3

∆v=3∆r

3×1%

=3%

EXPLANATION:

Discussion

12.	In a straight line motion of the distance travelledis proportional to the square root of the timetaken. The acceleration of the particle isproportional to-[UPSEAT-2000)
Answer» ANSWER is v³ or V CUBE

12.

In a straight line motion of the distance travelledis proportional to the square root of the timetaken. The acceleration of the particle isproportional to-[UPSEAT-2000)

Answer»

ANSWER is v³ or V CUBE

Discussion

13.	Hola! ♥️ pls solve it!!
Answer» Explanation: The angular frequency of the LCR circuit is: $w(omega) = \frac{1}{ \sqrt{lc} }$ here: L=1.5 H ; C=35 micro farad ; R= 20 OHM putting the value in the above formulae, we get: $= > \frac{1}{ \sqrt{(1.5) \times (35 \times {10}^{ - 6}) } }$ => 138 Hz *When* an AC *voltage* of *Angular* *frequency* w(*omega) =138* Hz is *applied* to *the* *circuit, then* w(*omega) L= $138 \times 1.5 = <klux>207</klux>$ =>So inductive* RESISTANCE will be= 207 ohm Also, $capacitive \: reactance = \frac{1}{w(omega) \times c}$ $\frac{1}{138 \times (35 \times {10}^{ - 6}) } = 207 \: ohm$ $impendence (Z) = \sqrt{ {r}^{2} + {(wl \: - \frac{1}{wc} )}^{2} }$ This the condition of resonance. The rms resonant current in the circuit is: => I=V/Z i.e. $\frac{200}{20} = 10$ So, *resonant* *current* *will* be: 10 A *Note: here* *The* *power* is *transferred* to *the* *resistor* *only* *therefore* : *Average* *power= (II) R => (10A* * *10A) 20 *ohm* = *2000* W *Hence, the* *average* *power* *transferred* is *2000* W. HOPE IT HELPS YOU

13.

Hola! ♥️ pls solve it!!

Answer»

Explanation:

The angular frequency of the LCR circuit is:

$w(omega) = \frac{1}{ \sqrt{lc} }$

here:

L=1.5 H ; C=35 micro farad ; R= 20 OHM

putting the value in the above formulae, we get:

$= > \frac{1}{ \sqrt{(1.5) \times (35 \times {10}^{ - 6}) } }$

=> 138 Hz

When an AC voltage of Angular frequency w(omega) =138 Hz is applied to the circuit, then

w(omega) L=

$138 \times 1.5 = <klux>207</klux>$

=>So inductive RESISTANCE will be= 207 ohm

Also,

$capacitive \: reactance = \frac{1}{w(omega) \times c}$

$\frac{1}{138 \times (35 \times {10}^{ - 6}) } = 207 \: ohm$

$impendence (Z) = \sqrt{ {r}^{2} + {(wl \: - \frac{1}{wc} )}^{2} }$

This the condition of resonance. The rms resonant current in the circuit is:

=> I=V/Z

i.e.

$\frac{200}{20} = 10$

So, resonant current will be: 10 A

Note: here The power is transferred to the resistor only

therefore :

Average power= (I*I) *R

=> (10A * 10A)* 20 ohm = 2000 W

Hence, the average power transferred is 2000 W.

HOPE IT HELPS YOU

Discussion

14.	What are chemical and physical properties of the manure
Answer» Answer: CHEMICAL:- The chemical characteristics of manureprimarily depend upon the chemical composition of the feed given to the animal. ... Similarly, INCREASED LEVELS of minerals fed (e.g. COPPER, phosphorus, sodium, POTASSIUM) increase the level of those nutrients in the manure. HOPE IT HELPS YOU ❤❤

14.

What are chemical and physical properties of the manure

Answer»

Answer:

CHEMICAL:-

The chemical characteristics of manureprimarily depend upon the chemical composition of the feed given to the animal. ... Similarly, INCREASED LEVELS of minerals fed (e.g. COPPER, phosphorus, sodium, POTASSIUM) increase the level of those nutrients in the manure.

HOPE IT HELPS YOU ❤❤

Discussion

15.	What is definition of distance in physics
Answer» *DISTANCE:- the* *LENGTH* *between* *TWO* *bodies* *which* *has* *MASS* *and* *occupy* *space*....

15.

What is definition of distance in physics

Answer»

DISTANCE:- the LENGTH between TWO bodies which has MASS and occupy space....

Discussion

16.	What do you mean by dielectric polarization
Answer» A dielectric (or dielectric MATERIAL) is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in an electrical CONDUCTOR but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced in the direction of the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself.[1] If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also REORIENT so that their symmetry axes ALIGN to the field.[1] The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials.[2][3][4] Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics, and cell biophysics.

16.

What do you mean by dielectric polarization

Answer»

A dielectric (or dielectric MATERIAL) is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in an electrical CONDUCTOR but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced in the direction of the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself.[1] If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also REORIENT so that their symmetry axes ALIGN to the field.[1]

The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials.[2][3][4] Dielectrics are important for explaining various phenomena in electronics, optics, solid-state physics, and cell biophysics.

Discussion

17.	Calculate the equivalent resistance and total current from the following
Answer» ANSWER: I don't KNOW this answer *PLEASE* *MARK* me as *brainlist* please please**

17.

Calculate the equivalent resistance and total current from the following

Answer»

ANSWER:

I don't KNOW this answer

PLEASE MARK me as brainlist

please

Discussion

18.	Why do we and universe exist
Answer» Answer: universes has its own SPECIALITY as universe was born by DIFFRENT type of gasses and formed diffrent PLANETS we CAME to earth from water as a bacteria and then we grew into fish then LIZARDS and then monkeys then ape then humans but I dont know why do we exist.

18.

Why do we and universe exist

Answer»

Answer:

universes has its own SPECIALITY as universe was born by DIFFRENT type of gasses and formed diffrent PLANETS we CAME to earth from water as a bacteria and then we grew into fish then LIZARDS and then monkeys then ape then humans but I dont know why do we exist.

Discussion

19.	How is nuclear force is charge dependent
Answer» $\huge\mathfrak\red{HoLa!!!!}$ ANSWER✓✓ The nuclear force is NEARLY independent of WHETHER the nucleons are NEUTRONS or protons. This property is called charge INDEPENDENCE. The force depends on whether the spins of the nucleons are parallel or antiparallel, as it has a non-central or TENSOR component.

19.

How is nuclear force is charge dependent

Answer»

$\huge\mathfrak\red{HoLa!!!!}$

ANSWER✓✓

The nuclear force is NEARLY independent of WHETHER the nucleons are NEUTRONS or protons. This property is called charge INDEPENDENCE. The force depends on whether the spins of the nucleons are parallel or antiparallel, as it has a non-central or TENSOR component.

Discussion

20.	A convex lens has a focal length of 50 cm its power is
Answer» ANSWER: GIVEN f=50cm power= 1/f =1/50 =0.02 diopteres

20.

A convex lens has a focal length of 50 cm its power is

Answer»

ANSWER:

GIVEN

f=50cm

power= 1/f

=1/50

=0.02 diopteres

Discussion

21.	A piece of wood of mass 150g has a volume of 200cm fino density in S.I and C.G.S unit
Answer» Answer: Mass of WOOD = 150g Volume of wood = 200cm³ Density = m/v D = 150/200 D - 0.75 g/cm³ (B) In SI system = 0.75 X 1000 = 750 kg/m³ hope it's HELPFUL for you

21.

A piece of wood of mass 150g has a volume of 200cm fino density in S.I and C.G.S unit

Answer»

Answer:

Mass of WOOD = 150g

Volume of wood = 200cm³

Density = m/v

D = 150/200

D - 0.75 g/cm³

(B) In SI system = 0.75 X 1000 = 750 kg/m³

hope it's HELPFUL for you

Discussion

22.	A train starting from one station accelerates uniformly over a distance of 5 km and moves with a constant speed over 35 km and retards uniformly over the last 10 km coming to a stop at another station 50 km away from the first station. Draw velocity distance graph of the train.
Answer» ANSWER: this is my QUESTION HOPE you UNDERSTAND

22.

A train starting from one station accelerates uniformly over a distance of 5 km and moves with a constant speed over 35 km and retards uniformly over the last 10 km coming to a stop at another station 50 km away from the first station. Draw velocity distance graph of the train.

Answer»

ANSWER:

this is my QUESTION

HOPE you UNDERSTAND

Discussion

23.	m y moves in a circular path of radius R he moves one complete circle and stops find Total distance in net displacement
Answer» ANSWER: distance= PERIMETER of the circle= 2πR displacement=zero(as the INITIAL and final POSITIONS are same )

23.

m y moves in a circular path of radius R he moves one complete circle and stops find Total distance in net displacement

Answer»

ANSWER:

distance= PERIMETER of the circle= 2πR

displacement=zero(as the INITIAL and final POSITIONS are same )

Discussion

24.	It is possible to have the value of relative permitivity less than one
Answer» nope, it is not possible. Because if a material had a relative permittivity LESS than 1 the charge stored would be less than with air/vacuum. the polarisation would have to be reversed so that the dielectric ACCUMULATED SURFACE charge of the same polarity as the ADJACENT plate.

Discussion

25.	Why liquid and gases assume shape of the container
Answer» ANSWER: WATER air Explanation: BCOZ the intermolecular SPACE is large

25.

Why liquid and gases assume shape of the container

Answer»

ANSWER:

WATER air

Explanation:

BCOZ the intermolecular SPACE is large

Discussion

26.	Two identical positive charges aap placed on the y-axis at y is equal to minus a and y is equal to plus a. The variation of electric potential along x axis is shown by the graph
Answer» Answer: (1) EXPLANATION: Let there be POSITIVE charge at the positions (0,a) and (0,-a) and there exists a point P at a DISTANCE 'x' from origin on x-axis. We need to find Electric Potential at point P, In $\triangle AOP,$ Using Pythagoras Theorem, $AO^2+OP^2=AP^2\\ \\a^2+x^2=OP^2\\ \\OP=\sqrt{a^2+x^2}$ Now, I need to find Electric Potential at that point due to two charges, That is, $V_{net}=\frac{Kq}{OP}+\frac{Kq}{OP}\\ \\= \frac{Kq}{\sqrt{a^2+x^2}}+\frac{Kq}{\sqrt{a^2+x^2}}\\ \\=\frac{2Kq}{\sqrt{a^2+x^2}}$ Hence, Our Expression of net Potential MATCHES with option (1). Verification: $\lim_{x \to{ \pm \infty}} \frac{2Kq}{\sqrt{a^2+x^2}}=0\\ \\ \lim_{x \to 0} \frac{2Kq}{\sqrt{a^2+x^2}} =\frac{2Kq}{a}$

26.

Two identical positive charges aap placed on the y-axis at y is equal to minus a and y is equal to plus a. The variation of electric potential along x axis is shown by the graph

Answer»

Answer:

(1)

EXPLANATION:

Let there be POSITIVE charge at the positions (0,a) and (0,-a) and there exists a point P at a DISTANCE 'x' from origin on x-axis.

We need to find Electric Potential at point P,

In $\triangle AOP,$

Using Pythagoras Theorem,

$AO^2+OP^2=AP^2\\ \\a^2+x^2=OP^2\\ \\OP=\sqrt{a^2+x^2}$

Now, I need to find Electric Potential at that point due to two charges,

That is,

$V_{net}=\frac{Kq}{OP}+\frac{Kq}{OP}\\ \\= \frac{Kq}{\sqrt{a^2+x^2}}+\frac{Kq}{\sqrt{a^2+x^2}}\\ \\=\frac{2Kq}{\sqrt{a^2+x^2}}$

Hence, Our Expression of net Potential MATCHES with option (1).

Verification:

$\lim_{x \to{ \pm \infty}} \frac{2Kq}{\sqrt{a^2+x^2}}=0\\ \\ \lim_{x \to 0} \frac{2Kq}{\sqrt{a^2+x^2}} =\frac{2Kq}{a}$

Discussion

27.	Name the physical quantity represented by the expression P. E vector
Answer» ANSWER: It is torque In SCALAR FORM it is PEsintheta

27.

Name the physical quantity represented by the expression P. E vector

Answer»

ANSWER:

It is torque

In SCALAR FORM it is PEsintheta

Discussion

28.	Find the equivalent resistance and total current from the following
Answer» 10 AND 10 ARE IN PARRLEL = 10 X 10/10+10 100/20=5 NOW THIS RESULTANT 5 IS PARRLEL WITH 10 = 5 X 10/15=50/15=10/3 NOW 10/3 AND 5 ARE IN SERIES =25/3 AND IT IS ALSO IN SERIES WITH 10 SO 25/3+10=55/3 and now 55/3 and 15 are in parrelel so, 55/3 X 15/55/3+15=275/100=27.5 AND NOW THE FINAL 10 IS IN SERIES WITH 27.5 SO 37.5 IS THE NET RESISTENCE NO V=IR SO V/R=I SO 10/37.5

28.

Find the equivalent resistance and total current from the following

Answer»

10 AND 10 ARE IN PARRLEL = 10 X 10/10+10

100/20=5

NOW THIS RESULTANT 5 IS PARRLEL WITH 10 = 5 X 10/15=50/15=10/3

NOW 10/3 AND 5 ARE IN SERIES =25/3 AND IT IS ALSO IN SERIES WITH 10

SO 25/3+10=55/3 and now 55/3 and 15 are in parrelel so, 55/3 X 15/55/3+15=275/100=27.5 AND NOW THE FINAL 10 IS IN SERIES WITH 27.5

SO 37.5 IS THE NET RESISTENCE NO V=IR SO V/R=I SO 10/37.5

Discussion

29.	3x = 5x - 10 find x ?????.....
Answer» Answer: X = 5 Explanation: Given, 3x = 5x-10 Now, 3x = 5x-10 3x-5x = -10 -2x = -10 on CANCELLING "MINUS" on both sides 2x = 10 x = 10/2 x = 5

29.

3x = 5x - 10 find x ?????.....

Answer»

Answer:

X = 5

Explanation:

Given,

3x = 5x-10

Now,

3x = 5x-10

3x-5x = -10

-2x = -10

on CANCELLING "MINUS" on both sides

2x = 10

x = 10/2

x = 5

Discussion

30.	Are the field lines are reality
Answer»

Discussion

31.	9x = 4x + 10 Find x = ??????????.?
Answer» ANSWER: X = 2 Explanation: Given, 9x = 4X+10 Now, 9x = 4x+10 9x -4x = 10 5x = 10 x = 10/5 X = 2

31.

9x = 4x + 10 Find x = ??????????.?

Answer»

ANSWER:

X = 2

Explanation:

Given,

9x = 4X+10

Now,

9x = 4x+10

9x -4x = 10

5x = 10

x = 10/5

X = 2

Discussion

32.	What is the function of the muscles that are attached to the vocal cords
Answer» Answer: the function is to control SOUND production. Explanation: these muscles WORK work coordinately to position the VOCAL folds in the MIDLINE of vocal fold vibration during sound production.

32.

What is the function of the muscles that are attached to the vocal cords

Answer»

Answer:

the function is to control SOUND production.

Explanation:

these muscles WORK work coordinately to position the VOCAL folds in the MIDLINE of vocal fold vibration during sound production.

Discussion

33.	Ratio of all fundamental forces
Answer» ANSWER: mark me down as brainlieast and follow me Explanation: I have read in many books that the RATIO of strengths of gravitational force, ELECTROMAGNETIC force, nuclear force is 1:10^36:10^38 (one: 10 raised to thirty six: 10 raised to thirty eight). On what basis are we able to compare this? I mean, there is no connection between any two forces in the above mentioned LIST of forces. For example, we measure gravitational force by measuring mass, while we measure electrostatic force with charge. So how can we compare those two forces? Or is it based on SI Units ? If it is, the ratio changes with system of units. Isn't it? Hope someone COULD throw some light on this. Thank You.

33.

Ratio of all fundamental forces

Answer»

ANSWER:

mark me down as brainlieast and follow me

Explanation:

I have read in many books that the RATIO of strengths of gravitational force, ELECTROMAGNETIC force, nuclear force is 1:10^36:10^38 (one: 10 raised to thirty six: 10 raised to thirty eight). On what basis are we able to compare this? I mean, there is no connection between any two forces in the above mentioned LIST of forces. For example, we measure gravitational force by measuring mass, while we measure electrostatic force with charge. So how can we compare those two forces?

Or is it based on SI Units ? If it is, the ratio changes with system of units. Isn't it?

Hope someone COULD throw some light on this. Thank You.

Discussion

34.	3. What is meant by uniform speed? How does variable speed differ from the uniform speed?4. Define the term velocity. Is velocity a scalar or a vector quantity? What are the SI units of velocity?5. When is the velocity said to have changed?6. What is meant by average velocity of a body moving in a particular direction?7. How does speed differ from velocity?
Answer» Explanation: 3) Uniform Speed: A body is said to be MOVING with uniform speed, if it covers equal distances in equal INTERVALS of TIME, however small these intervals may be. Variable Speed: A body is said to be moving with variable speed if it covers unequal distances in equal intervals of time, however small these intervals may be. the variable speed differ with uniform speed by the coverage of distance... 4) Velocity is defined as the displacement per unit time in a particular direction velocity is a vector quantity and its SI units are meter/sec.. 5) change in speed, or a change in direction, or a change in both speed and direction means that the object has a change in velocity... 6) AVERAGE velocity=linear displacement /total time 7) velocity is the speed with a direction, while speed does not have a direction. Speed is a scalar quantity

34.

3. What is meant by uniform speed? How does variable speed differ from the uniform speed?4. Define the term velocity. Is velocity a scalar or a vector quantity? What are the SI units of velocity?5. When is the velocity said to have changed?6. What is meant by average velocity of a body moving in a particular direction?7. How does speed differ from velocity?

Answer»

Explanation:

3) Uniform Speed: A body is said to be MOVING with uniform speed, if it covers equal distances in equal INTERVALS of TIME, however small these intervals may be.

Variable Speed: A body is said to be moving with variable speed if it covers unequal distances in equal intervals of time, however small these intervals may be.

the variable speed differ with uniform speed by the coverage of distance...

4) Velocity is defined as the displacement per unit time in a particular direction

velocity is a vector quantity and its SI units are meter/sec..

5) change in speed, or a change in direction, or a change in both speed and direction means that the object has a change in velocity...

6) AVERAGE velocity=linear displacement /total time

7) velocity is the speed with a direction, while speed does not have a direction. Speed is a scalar quantity

Discussion

35.	circular track of radius 20 metre and runner cover in one revolution then find its speed if time taken by 10 seconds
Answer» ANSWER: speed=distance/time Distance =2πr=2×π20=40π Time taken=10sec Speed=40π/10=4π=4×22/7=12.56m/s Explanation:

35.

circular track of radius 20 metre and runner cover in one revolution then find its speed if time taken by 10 seconds

Answer»

ANSWER: speed=distance/time

Distance =2πr=2×π20=40π

Time taken=10sec

Speed=40π/10=4π=4×22/7=12.56m/s

Explanation:

Discussion

36.	Syllabous class 10 math
Answer» Answer: don't KNOW MATE . Explanation: i don't fnow about 10 class syllabus bevause i am in 8 class

36.

Syllabous class 10 math

Answer»

Answer:

don't KNOW MATE .

Explanation:

i don't fnow about 10 class syllabus bevause i am in 8 class

Discussion

37.	1. What are the characteristics of the distance-time graph for an object moving at a uniform speed ?
Answer» ANSWER:it is a STRAIGHT line Explanation:

37.

1. What are the characteristics of the distance-time graph for an object moving at a uniform speed ?

Answer»

ANSWER:it is a STRAIGHT line

Explanation:

Discussion

38.	How does atmospheric pressure changes with altitude explain in detail
Answer» That is, as the altitude increases, atmospheric pressure decreases. This is due to the fact that air molecules are CONSTANTLY being pulled downwards (towards the center of the Earth) by Gravity. So, air molecules are TIGHTLY packed near the surface of the earth, compared to some higher altitude. Pressure with Height: pressuredecreases with increasing altitude. The pressure at any level in theatmosphere may be interpreted as the total weight of the air above a unit area at any ELEVATION. At higher ELEVATIONS, there are fewer air molecules above a given surface than a similar surface at lower levels.

Discussion

39.	6x = x + 45 x = ?????...................
Answer» HELLO! Given, 6x = x+45 Now, 6x = x+45 6x-x = 45 5x = 45 x = 45/5 x = 9

39.

6x = x + 45 x = ?????...................

Answer»

HELLO!

Given,

6x = x+45

Now,

6x = x+45

6x-x = 45

5x = 45

x = 45/5

x = 9

Discussion

40.	Radha left a bread piece in a wet Tiffin Box. After two three days brown, green substance appeared what change occurred? why?
Answer» Because FUNGUS and BACTERIAS found APPROPRIATE place to GROW

Discussion

41.	Figure shows the displacement -time graph of four children A,B,C and which has the highest velocity?
Answer» ANSWER: HA its shows ..........................

41.

Figure shows the displacement -time graph of four children A,B,C and which has the highest velocity?

Answer»

ANSWER:

HA its shows ..........................

Discussion

42.	a concave mirror produces a real image of magnification 1/2 when an object is placed at a distance of 50 cm from it where should be the object be placed so that a virtual image of double the size is formed by the mirror
Answer» Answer: Initial OBJ. dist = -60(real OBJECT) ". magnification (m) = -1/2 (as both obj and image are real) We know , m= -f/(u-f) [f=focal LENGTH] f= -20cm Now , obj dist = u' magnification(m')=2 (as image is virtual of real object) f=-20 CM We know , m= -f/(u'-f) 2=20/(u'+20) u'=-10cm Hence , the obj should at a distance of 10 cm in front of the mirror.

42.

a concave mirror produces a real image of magnification 1/2 when an object is placed at a distance of 50 cm from it where should be the object be placed so that a virtual image of double the size is formed by the mirror

Answer»

Answer:

Initial OBJ. dist = -60(real OBJECT)

". magnification (m) = -1/2 (as both obj and image are real)

We know , m= -f/(u-f) [f=focal LENGTH]

f= -20cm

Now , obj dist = u'

magnification(m')=2 (as image is virtual of real object)

f=-20 CM

We know , m= -f/(u'-f)

2=20/(u'+20)

u'=-10cm

Hence , the obj should at a distance of 10 cm in front of the mirror.

Discussion

43.	4y - 4 = 2yFind y ??????...........
Answer» Explanation: 4y-4=2y =4y-2y=4 =2y=4 y=2

43.

4y - 4 = 2yFind y ??????...........

Answer»

Explanation:

4y-4=2y

=4y-2y=4

=2y=4

y=2

Discussion

44.	3x - 4 = 2 ?????find x ??????????
Answer» Answer: GIVEN : 3X - 4 = 2 Find : X = ?? SOLUTION : 3x - 4 = 2 3x = 6 x = 6/3 x = 2 Thanks

44.

3x - 4 = 2 ?????find x ??????????

Answer»

Answer:

GIVEN :

3X - 4 = 2

Find :

X = ??

SOLUTION :

3x - 4 = 2

3x = 6

x = 6/3

x = 2

Thanks

Discussion

45.	Acceleration due to gravity moon is 1/6that of on earth. How much astronaut weight on moon. If he weight 90kg on earth(10m/s acceleration due to gravity on earth)
Answer» Explanation: WEIGHT =mass×accel. due to gravity gravity on MOON is=10/6 weight on moon =(10/6)×9 weight = 15N

45.

Acceleration due to gravity moon is 1/6that of on earth. How much astronaut weight on moon. If he weight 90kg on earth(10m/s acceleration due to gravity on earth)

Answer»

Explanation:

WEIGHT =mass×accel. due to gravity

gravity on MOON is=10/6

weight on moon =(10/6)×9

weight = 15N

Discussion

46.	What is sound ?how is it produced
Answer» ANSWER: Sound is the term to describe what is heard when sound waves pass through a MEDIUM to the ear. All sounds are made by vibrations of molecules through which the sound TRAVELS. For INSTANCE, when a drum or a cymbal is struck, the object vibrates. ... These vibrations let you hear different sounds.

46.

What is sound ?how is it produced

Answer»

ANSWER:

Sound is the term to describe what is heard when sound waves pass through a MEDIUM to the ear. All sounds are made by vibrations of molecules through which the sound TRAVELS. For INSTANCE, when a drum or a cymbal is struck, the object vibrates. ... These vibrations let you hear different sounds.

Discussion

47.	The rocket travels at a speed of 15,000M/s . Express this speed and km/h
Answer» Answer: 1km = 1000m 15000m=15000/1000km

47.

The rocket travels at a speed of 15,000M/s . Express this speed and km/h

Answer»

Answer:

1km = 1000m

15000m=15000/1000km

Discussion

48.	What is negative accelartion
Answer» Answer: It only means acceleration in the negative DIRECTION. If the velocity is said to be in the positive direction, negative acceleration would INDICATE that the OBJECT is SLOWING down. But if the velocity is said to be in the negative direction, negative acceleration would indicate that the object is speeding up.

48.

What is negative accelartion

Answer»

Answer:

It only means acceleration in the negative DIRECTION. If the velocity is said to be in the positive direction, negative acceleration would INDICATE that the OBJECT is SLOWING down. But if the velocity is said to be in the negative direction, negative acceleration would indicate that the object is speeding up.

Discussion

49.	X+3 = 2x Find x ????................
Answer» SOLUTION : Given : X+3 = 2x Find : x = ? SOL : x+3 = 2x 2x - x = 3 x = 3

49.

X+3 = 2x Find x ????................

Answer»

SOLUTION :

Given :

X+3 = 2x

Find :

x = ?

SOL :

x+3 = 2x

2x - x = 3

x = 3

Discussion

50.	TheholesofthemcircularCoilhasn to
Answer» ANSWER: KYA KARNA hai bhai PURA likho

50.

TheholesofthemcircularCoilhasn to

Answer»

ANSWER:

KYA KARNA hai bhai PURA likho

Discussion

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