67486 + Interview Questions in Secondary School in Physics

1.	Find all the currents and voltages across each resistor and cell in the following circuits
Answer» ANSWER: apply v=IR TO EACH CIRCUIT LINE U GET THE ANSWER BY EITHER TRANSFORMING THE FORMULA OR DIRECTLY

1.

Find all the currents and voltages across each resistor and cell in the following circuits

Answer»

ANSWER:

apply v=IR

TO EACH CIRCUIT LINE U GET THE ANSWER BY EITHER TRANSFORMING THE FORMULA OR DIRECTLY

Discussion

2.	Do black holes explode??and if yes then when and why??DON'T EVEN DARE TO GIVE COPIED ANSWERS!!
Answer» ANSWER: "Black holes" are BASICALLY famous for pulling materials TOWARDS them and they even also expell VARIOUS amount of material and ENERGY. Moreover, They are redirected into jets that blast outward into space and surrounds the material.. If u find it useful please mark my answer as brainliest.

2.

Do black holes explode??and if yes then when and why??DON'T EVEN DARE TO GIVE COPIED ANSWERS!!

Answer»

ANSWER:

"Black holes" are BASICALLY famous for pulling materials TOWARDS them and they even also expell VARIOUS amount of material and ENERGY. Moreover, They are redirected into jets that blast outward into space and surrounds the material..

If u find it useful please mark my answer as brainliest.

Discussion

3.	(A+B)²+(A-B)²=4A•Ball A and B are vectors
Answer» ANSWER: A=B EXPLANATION: On SOLVING the EQUATION we GET A^2 +B^2=2AB Hence A=B

3.

(A+B)²+(A-B)²=4A•Ball A and B are vectors

Answer»

ANSWER:

A=B

EXPLANATION:

On SOLVING the EQUATION we GET A^2 +B^2=2AB

Hence A=B

Discussion

4.	State Kepler's three laws of planetary motion
Answer» Answer: There are actually three, KEPLER's laws that is, of planetary motion: 1) EVERY planet's orbit is an ellipse with the Sun at a focus; 2) a LINE joining the Sun and a planet SWEEPS out equal areas in equal times; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its ... Explanation: are you in snap?? my snap id is danger_army9001 follow,,,me

4.

State Kepler's three laws of planetary motion

Answer»

Answer:

There are actually three, KEPLER's laws that is, of planetary motion: 1) EVERY planet's orbit is an ellipse with the Sun at a focus; 2) a LINE joining the Sun and a planet SWEEPS out equal areas in equal times; and 3) the square of a planet's orbital period is proportional to the cube of the semi-major axis of its ...

Explanation:

are you in snap??

my snap id is danger_army9001

follow,,,me

Discussion

5.	Find the maximum separation such that both the charge particles is at rest for the given figure
Answer» ANSWER: SORRY don't KNOW but NICE HANDWRITING hahahahaha.hahahah

5.

Find the maximum separation such that both the charge particles is at rest for the given figure

Answer»

ANSWER:

SORRY don't KNOW but NICE HANDWRITING hahahahaha.hahahah

Discussion

6.	If A is the amplitude of an object moving with SHM,then distance traveled by the object in a time equal to 1/8 of its period is:
Answer» EXPLANATION: Y = A SIN wt t = 1/8 T = 1/8 X 2π/W Y = A sin ( w x π/4w) = A sin (45⁰) = A 1/√2 Y = A/√2

6.

If A is the amplitude of an object moving with SHM,then distance traveled by the object in a time equal to 1/8 of its period is:

Answer»

EXPLANATION:

Y = A SIN wt

t = 1/8 T = 1/8 X 2π/W

Y = A sin ( w x π/4w) = A sin (45⁰)

= A 1/√2

Y = A/√2

Discussion

7.	block of mass 8 kg acted by a force of 56 newton exerted by string in vertically upward position, system starts from rest, work done by tension in 10sec
Answer» Given:- MASS, m=8 kg Tension in the wire, T=56 N To Find:- WORK done by tension Explanation:- EXPRESSION of work done by force F is given by:- $W=F\times scos\theta \text{ where,}\\\\s=\text{distance travelled by the object}\\\theta=\text{angle between force and distance direction}\\\\\text{ATQ, tension is in vertical direction and distance is in horizontal direction }\Rightarrow\theta=90^{0}\\\\\Rightarrow W=F\times scos90^{0}=0J$

7.

block of mass 8 kg acted by a force of 56 newton exerted by string in vertically upward position, system starts from rest, work done by tension in 10sec

Answer»

Given:-

MASS, m=8 kg

Tension in the wire, T=56 N

To Find:-

WORK done by tension

Explanation:-

EXPRESSION of work done by force F is given by:-

$W=F\times scos\theta \text{ where,}\\\\s=\text{distance travelled by the object}\\\theta=\text{angle between force and distance direction}\\\\\text{ATQ, tension is in vertical direction and distance is in horizontal direction }\Rightarrow\theta=90^{0}\\\\\Rightarrow W=F\times scos90^{0}=0J$

Discussion

8.	According to the resistivity formularesistance is inversely proportional to area of cross section of the conductorso why are wires made thin as area of cross section will be less and resistivity will be more??
Answer» Answer: $\huge \fbox \colorbox{red}{ ༆Question༄彡}$ according to the resistivity formula RESISTANCE is inversely PROPORTIONAL to area of cross section of the conductor so why are wires made THIN as area of cross section will be less and resistivity will be more?? $\huge\fbox\red{A}\fbox\pink{n}\fbox\purple{S}\fbox\green{w}\fbox\blue{E}\fbox\orange{r}$ The resistance of a WIRE is directly proportional to it's length and inversely propositional to it's cross sectional area. Resistance also depends on the material of the conductor, or circuit element, generally increases with increasing temperature *MORE* *ABOUT IT :- More* *collisions* mean more resistance. second, the cross sectional area of the wires will affect the amount of resistance. A third variable that is known to affect the resistance to charge flow is the material that a wire is made of not all materials are created equal in terms of their conductive abili**ty.

8.

According to the resistivity formularesistance is inversely proportional to area of cross section of the conductorso why are wires made thin as area of cross section will be less and resistivity will be more??

Answer»

Answer:

$\huge \fbox \colorbox{red}{ ༆Question༄彡}$

according to the resistivity formula

RESISTANCE is inversely PROPORTIONAL to area of cross section of the conductor

so why are wires made THIN as area of cross section will be less and resistivity will be more??

$\huge\fbox\red{A}\fbox\pink{n}\fbox\purple{S}\fbox\green{w}\fbox\blue{E}\fbox\orange{r}$

The resistance of a WIRE is directly proportional to it's length and inversely propositional to it's cross sectional area. Resistance also depends on the material of the conductor, or circuit element, generally increases with increasing temperature

MORE ABOUT IT :-

More collisions mean more resistance. second, the cross sectional area of the wires will affect the amount of resistance. A third variable that is known to affect the resistance to charge flow is the material that a wire is made of not all materials are created equal in terms of their conductive ability.

Discussion

9.	. Establish a relation between internal resistance of a cell EMF and electromotive force.
Answer» ANSWER: Internal resistance refers to the opposition to the flow of current offered by the cells and batteries themselves resulting in the generation of heat. Internal resistance is measured in Ohms. The RELATIONSHIP between internal resistance (r) and emf (e) of cell s given by. e = I (r + R) Where, e = EMF i.e. ELECTROMOTIVE force (Volts), I = current (A), R = Load resistance, and r is the internal resistance of cell measured in ohms. On rearranging the above equation we get; e = IR + Ir or, e = V + Ir In the above equation, V is the potential difference (TERMINAL) across the cell when the current (I) is flowing through the circuit. Note: The emf (e) of a cell is always GREATER than the potential difference (terminal) across the cell

9.

. Establish a relation between internal resistance of a cell EMF and electromotive force.

Answer»

ANSWER:

Internal resistance refers to the opposition to the flow of current offered by the cells and batteries themselves resulting in the generation of heat. Internal resistance is measured in Ohms. The RELATIONSHIP between internal resistance (r) and emf (e) of cell s given by.

e = I (r + R)

Where, e = EMF i.e. ELECTROMOTIVE force (Volts), I = current (A), R = Load resistance, and r is the internal resistance of cell measured in ohms.

On rearranging the above equation we get;

e = IR + Ir or, e = V + Ir

In the above equation, V is the potential difference (TERMINAL) across the cell when the current (I) is flowing through the circuit.

Note: The emf (e) of a cell is always GREATER than the potential difference (terminal) across the cell

Discussion

10.	8) A diffraction grating has a spacing of 1.6 x 10 m. A beam of light incident normally on thegrating. The first order maximum makes an angle of 200 with the undeviated beam. What isthe wavelength of the incident light?
Answer» ANSWER: d sin⁡θ=nλ 1.6 ∙ 〖10〗^(-6) sin⁡20=(1)(λ) λ=550 NM.

10.

8) A diffraction grating has a spacing of 1.6 x 10 m. A beam of light incident normally on thegrating. The first order maximum makes an angle of 200 with the undeviated beam. What isthe wavelength of the incident light?

Answer»

ANSWER:

d sin⁡θ=nλ

1.6 ∙ 〖10〗^(-6) sin⁡20=(1)(λ)

λ=550 NM.

Discussion

11.	What is the main function of proteins?to produce red blood cellsto build muscle tissuesto digest large moleculesto eliminate waste products
Answer» ANSWER: To BUILD MUSCLE TISSUES....

11.

What is the main function of proteins?to produce red blood cellsto build muscle tissuesto digest large moleculesto eliminate waste products

Answer»

ANSWER:

To BUILD MUSCLE TISSUES....

Discussion

12.	Given ₁ = 2î + 3ĵ + k, ñ₂ = 2î - 4ĵ-k, Find the magnitude of (a) ri (b)2r₁ + 3r2
Answer» ANSWER: UR ANS!!!! HAPPY to HELP

12.

Given ₁ = 2î + 3ĵ + k, ñ₂ = 2î - 4ĵ-k, Find the magnitude of (a) ri (b)2r₁ + 3r2

Answer»

ANSWER:

UR ANS!!!! HAPPY to HELP

Discussion

13.	derive an expression for the energy of the electron in a stable orbit in an atom. hence, show that the energy is inversely proportional to (1) the radius of the orbit (2)the square of the principal quantum numbers
Answer» ANSWER: In a hydrogen atom, the ELECTRON moves in an orbit of radius 0.5A^o making 10^16 REVOLUTION per second. The magnetic moment ASSOCIATED with the ORBITAL

13.

derive an expression for the energy of the electron in a stable orbit in an atom. hence, show that the energy is inversely proportional to (1) the radius of the orbit (2)the square of the principal quantum numbers

Answer»

ANSWER:

In a hydrogen atom, the ELECTRON moves in an orbit of radius 0.5A^o making 10^16 REVOLUTION per second. The magnetic moment ASSOCIATED with the ORBITAL

Discussion

14.	A spherical bob of mass'm' tied to an idealstring of length 'l' is made to execute a 'just' vertical circular motion. obtain the expression for the linear speed of thebob at the highest point of the its vertical circular path
Answer» ANSWER: rsffvcvvvvvvvvvvvvvvvvvvv

14.

A spherical bob of mass'm' tied to an idealstring of length 'l' is made to execute a 'just' vertical circular motion. obtain the expression for the linear speed of thebob at the highest point of the its vertical circular path

Answer»

ANSWER:

rsffvcvvvvvvvvvvvvvvvvvvv

Discussion

15.	a car travels from stop a to stop b with a speed of 30 km /h and the. returns back a with a speed of 50 km/h .find distance travelled by car and average speed of the car
Answer» Answer: x = 80 KM Explanation: Speed of car from a to b, V1 = 30km/h Speed of car from b to a, v2 = 50km/h let the time taken to travel from to be be t1 and time taken to travel from b to a be T2 then by the formula of distance we know that for path a to b distance x = 30/t1 t1 =30/x -------(1) for path b to a distance, x = 50/t2 t2 = 50/x --------(2) adding eq. (1) and (2) t1 + t2 = 30/x+50/x = (30 + 50)/x x = 80 Km (here let TOTAL time be 1 HOUR ) Hope it helps : )

15.

a car travels from stop a to stop b with a speed of 30 km /h and the. returns back a with a speed of 50 km/h .find distance travelled by car and average speed of the car

Answer»

Answer:

x = 80 KM

Explanation:

Speed of car from a to b, V1 = 30km/h

Speed of car from b to a, v2 = 50km/h

let the time taken to travel from to be be t1 and time taken to travel from b to a be T2 then by the formula of distance we know that

for path a to b

distance x = 30/t1

t1 =30/x -------(1)

for path b to a

distance, x = 50/t2

t2 = 50/x --------(2)

adding eq. (1) and (2)

t1 + t2 = 30/x+50/x

= (30 + 50)/x

x = 80 Km (here let TOTAL time be 1 HOUR )

Hope it helps : )

Discussion

16.	Why does the moon reflects the sun's light??!plz help me I need the answer!!!DON'T EVEN DARE TO GIVE COPIED ANSWERS!!
Answer» it is because moon is a mirror so RAYS of SUN LIGHT BOUNCE back that why moon is not glow like sun

Discussion

17.	Why does the moon reflects the sun's light???!
Answer» Answer: The light REFLECTS off old volcanoes, craters, and lava flows on the MOON's SURFACE

17.

Why does the moon reflects the sun's light???!

Answer»

Answer:

The light REFLECTS off old volcanoes, craters, and lava flows on the MOON's SURFACE

Discussion

18.	What is frictional force?
Answer» Answer :- Friction is the FORCE that resists motion when the surface of ONE object comes in contact with the surface of another. *Mark* me as a *BRAINLIEST*

18.

What is frictional force?

Answer»

Answer :-

Friction is the FORCE that resists motion when the surface of ONE object comes in contact with the surface of another.

Mark me as a BRAINLIEST

Discussion

19.	Deduce an expression for magnetic scalar potential (5marks)
Answer» Answer: Magnetic VECTOR potential When we derived the scalar electric potential we started with the RELATION R £ E = 0 to conclude that E could be written as the gradient of a scalar potential. ... Instead, the divergence of B is zero. That means that B may be written as the curl of a vector that we shall call A.

19.

Deduce an expression for magnetic scalar potential (5marks)

Answer»

Answer:

Magnetic VECTOR potential When we derived the scalar electric potential we started with the RELATION R £ E = 0 to conclude that E could be written as the gradient of a scalar potential. ... Instead, the divergence of B is zero. That means that B may be written as the curl of a vector that we shall call A.

Discussion

20.	குண்டூசி மற்றும் துண்ணோக்கியை பயன்படுத்தி சீரற்ற வளைவின் மூலம் ஒரு சட்டத்தின் யங் குணகத்தை கண்டறியும் சோதனையை விளக்குக.
Answer» ANSWER: I don't KNOW your LANGUAGE sorryy..

20.

குண்டூசி மற்றும் துண்ணோக்கியை பயன்படுத்தி சீரற்ற வளைவின் மூலம் ஒரு சட்டத்தின் யங் குணகத்தை கண்டறியும் சோதனையை விளக்குக.

Answer»

ANSWER:

I don't KNOW your LANGUAGE

sorryy..

Discussion

21.	Diagonal of squre is 13 cm find length of side
Answer» Explanation: The DIAGONAL of thee SQUARE is given as 13cm. Let a be the side of the square. Diagonal=13 2 a=13 a= 2 13 a= 2 13 2 a=6.5 2 cm Therefore, the side of the square is 6.5 2 cm.

21.

Diagonal of squre is 13 cm find length of side

Answer»

Explanation:

The DIAGONAL of thee SQUARE is given as 13cm.

Let a be the side of the square.

Diagonal=13

2

a=13

a=

2

13

a=

2

13

2

a=6.5

2

cm

Therefore, the side of the square is 6.5

2

cm.

Discussion

22.	(i) Explain the following terms related to spherical lenses:(a) optical centre(d) aperture(b) centre of curvature(e) principal focus(c) principal axis(f) focal length
Answer» ANSWER: I HOPE it MAY hepls u Explanation: be HAPPY

22.

(i) Explain the following terms related to spherical lenses:(a) optical centre(d) aperture(b) centre of curvature(e) principal focus(c) principal axis(f) focal length

Answer»

ANSWER:

I HOPE it MAY hepls u

Explanation:

be HAPPY

Discussion

23.	9. Two equal positive charges are fixed at the points[-a, 0] and [a, O] on the x-axis. A negative chargeis released from rest at the points [0, 2a] on they-axis. The charge will1(1) Move to the origin and remain at rest(2) Move to infinity(3) Execute oscillatory but not SHM7(4) Execute SHM
Answer» Answer: as both charges are positively CHARGED so they will not FORM dipole and no oscillatory motion will be there now both of the last options are eliminated. now the RELEASED charged is negatively charged so it will be attracted TOWARDS origin ... hence it wil move towards origin hope it HELP you

23.

9. Two equal positive charges are fixed at the points[-a, 0] and [a, O] on the x-axis. A negative chargeis released from rest at the points [0, 2a] on they-axis. The charge will1(1) Move to the origin and remain at rest(2) Move to infinity(3) Execute oscillatory but not SHM7(4) Execute SHM

Answer»

Answer:

as both charges are positively CHARGED so they will not FORM dipole and no oscillatory motion will be there now both of the last options are eliminated.

now the RELEASED charged is negatively charged so it will be attracted TOWARDS origin ...

hence it wil move towards origin

hope it HELP you

Discussion

24.	What is Resistance ?
Answer» Answer: Before LOOKING at what resistance is, it is necessary to understand a little about current and what it is. ESSENTIALLY a FLOW of current in a MATERIAL consists of a movement of electrons in one direction. In many materials there are free electrons moving about RANDOMLY within the structure. While these move randomly there is no current flow, because the number moving in one direction will be equal to the number moving in the other. Only when a potential causes a drift in a particular direction can a current be said to flow.

24.

What is Resistance ?

Answer»

Answer:

Before LOOKING at what resistance is, it is necessary to understand a little about current and what it is. ESSENTIALLY a FLOW of current in a MATERIAL consists of a movement of electrons in one direction. In many materials there are free electrons moving about RANDOMLY within the structure. While these move randomly there is no current flow, because the number moving in one direction will be equal to the number moving in the other. Only when a potential causes a drift in a particular direction can a current be said to flow.

Discussion

25.	A boy is running on a straight road.He runs 500m towards north in 2min 10sec and then turns back and runs 200m in 1 minute.Calculate his average speed and magnitude of average velocity during first 2min 10sec and his average speed and magnitude of average velocity during the whole journey.
Answer» Answer: 700/190 70/19 =0.27m/s

25.

A boy is running on a straight road.He runs 500m towards north in 2min 10sec and then turns back and runs 200m in 1 minute.Calculate his average speed and magnitude of average velocity during first 2min 10sec and his average speed and magnitude of average velocity during the whole journey.

Answer»

Answer:

700/190

70/19

=0.27m/s

Discussion

26.	A convex mirror used for rear-view of an automobile has a radiusof curvature of 6.00 m. If a bus islocated at 10.00 m from thismirror, find the position, nature andsize of the image.
Answer» Answer: Here the bus is the object of the CONVEX mirror whose image is FORMED. The position of the bus (or object) from the mirror is GIVEN to be u=5⋅00m. The RADIUS of curvature of the convex mirror is given to be R=3⋅00m, then its focal length will be f=R2=32=1⋅5m. Let v be the position of the image from the mirror. Explanation: *Mark* *me as brainliest* *and* *FOLLOW*

26.

A convex mirror used for rear-view of an automobile has a radiusof curvature of 6.00 m. If a bus islocated at 10.00 m from thismirror, find the position, nature andsize of the image.

Answer»

Answer:

Here the bus is the object of the CONVEX mirror whose image is FORMED. The position of the bus (or object) from the mirror is GIVEN to be u=5⋅00m. The RADIUS of curvature of the convex mirror is given to be R=3⋅00m, then its focal length will be f=R2=32=1⋅5m. Let v be the position of the image from the mirror.

Explanation:

Mark me as brainliest and FOLLOW

Discussion

27.	What is vibgyor tell me fast
Answer» Answer: VIBGYOR (Violet–Indigo–Blue–Green–Yellow–Orange–Red) is a POPULAR MNEMONIC device used for memorizing the traditional optical SPECTRUM.

27.

What is vibgyor tell me fast

Answer»

Answer:

VIBGYOR (Violet–Indigo–Blue–Green–Yellow–Orange–Red) is a POPULAR MNEMONIC device used for memorizing the traditional optical SPECTRUM.

Discussion

28.	A crate is moved by pulling the rope attached to it. It moves 10m on a straight horizontal road by a force of 100N. How much work will be don't if:a) The rope is parallel to the road.b)The rope is making an angle of 30 degree with the road.
Answer» ANSWER: hey army sorry for spam i think you are NEW here we can START being friends ntmy~ Explanation:

28.

A crate is moved by pulling the rope attached to it. It moves 10m on a straight horizontal road by a force of 100N. How much work will be don't if:a) The rope is parallel to the road.b)The rope is making an angle of 30 degree with the road.

Answer»

ANSWER:

hey army

sorry for spam

i think you are NEW here

we can START being friends

ntmy~

Explanation:

Discussion

29.	How many soldiers are there in chess board
Answer» ANSWER: how MANY SOLDIERS are there in CHESS BOARD

29.

How many soldiers are there in chess board

Answer»

ANSWER:

how MANY SOLDIERS are there in CHESS BOARD

Discussion

30.	What is charge is conserved?
Answer» ANSWER: please Mark me as a brainlist Explanation: In PHYSICS, charge CONSERVATION is the principle that the TOTAL electric charge in an isolated system never changes. The net quantity of electric charge, the amount of POSITIVE charge minus the amount of negative charge in the universe, is always conserved.

30.

What is charge is conserved?

Answer»

ANSWER:

please Mark me as a brainlist

Explanation:

In PHYSICS, charge CONSERVATION is the principle that the TOTAL electric charge in an isolated system never changes. The net quantity of electric charge, the amount of POSITIVE charge minus the amount of negative charge in the universe, is always conserved.

Discussion

31.	One end of a plastic rod is immersed in boiling water. The temperature of the other end increases. Use ideas from kinetic model matter to explain how energy travels from one end to other.
Answer» ANSWER: By the process of conduction of heat. Explanation: Because heat is a type of energy that TRANSFERS from one place to other and is independent of the WAY chosen due to DIFFERENCE of temperature(Average KINETIC energy of molecules ). It is not a state function.

31.

One end of a plastic rod is immersed in boiling water. The temperature of the other end increases. Use ideas from kinetic model matter to explain how energy travels from one end to other.

Answer»

ANSWER:

By the process of conduction of heat.

Explanation:

Because heat is a type of energy that TRANSFERS from one place to other and is independent of the WAY chosen due to DIFFERENCE of temperature(Average KINETIC energy of molecules ). It is not a state function.

Discussion

32.	The air pressure inside a submarine is 0.62 atm. What would be the height of a column of mercury balanced by this pressure?
Answer» Answer: 471.2 mm hg Explanation: as for 1 ATM mercury shows 760MM of hg than for .62 atm USING unitary method it will SHOW 471.2 mm of hg

32.

The air pressure inside a submarine is 0.62 atm. What would be the height of a column of mercury balanced by this pressure?

Answer»

Answer:

471.2 mm hg

Explanation:

as for 1 ATM mercury shows 760MM of hg

than for .62 atm

USING unitary method it will SHOW 471.2 mm of hg

Discussion

33.	Derive second equation of motion
Answer» EXPLANATION: Hey FRIEND here is your answer S=displacement t=time a=acceleration u=initial velocity S=(avg velocity)Xt S=(v+u/2) t. avg velocity= v+u/2 relplce v with u+at. ( from 1ST EQUATION) S=(2u+at)t/2 S=ut+at^2/2 hope it help :)

33.

Derive second equation of motion

Answer»

EXPLANATION:

Hey FRIEND here is your answer

S=displacement

t=time

a=acceleration

u=initial velocity

S=(avg velocity)Xt

S=(v+u/2) t. avg velocity= v+u/2

relplce v with u+at. ( from 1ST EQUATION)

S=(2u+at)t/2

S=ut+at^2/2

hope it help :)

Discussion

34.	Molar volume is the volume occupied by 1 mol of any (ideal) gas at standard temperature and pressure (STP: 1 atmospheric pressure, 0 °C). Show that it is 22.4 litres.
Answer» Answer we know that, A gas that satisfies the perfect gas equation at all PRESSURE and temperature is called as ideal gas. The ideal gas equation which RELATES with pressure, VOLUME and absolute temperature is given as, $\bf PV = nRT$ here, R denotes the UNIVERSAL gas constant N denotes number of moles T denotes standard temperature P denotes standard pressure By substituting the values in the formula, $\dashrightarrow \sf PV = nRT$ $\dashrightarrow \sf V = \dfrac{ nRT}{P}$ $\dashrightarrow \sf V = \dfrac{1 \times 8.314 \times 273}{1.013 \times {10}^{5} }$ $\dashrightarrow \sf V = 0.0224 \: {m}^{3}$ $\dashrightarrow \sf V = 22.4 \: litres$

34.

Molar volume is the volume occupied by 1 mol of any (ideal) gas at standard temperature and pressure (STP: 1 atmospheric pressure, 0 °C). Show that it is 22.4 litres.

Answer»

Answer

we know that,

A gas that satisfies the perfect gas equation at all PRESSURE and temperature is called as ideal gas.

The ideal gas equation which RELATES with pressure, VOLUME and absolute temperature is given as,

$\bf PV = nRT$

here,

R denotes the UNIVERSAL gas constant
N denotes number of moles
T denotes standard temperature
P denotes standard pressure

By substituting the values in the formula,

$\dashrightarrow \sf PV = nRT$

$\dashrightarrow \sf V = \dfrac{ nRT}{P}$

$\dashrightarrow \sf V = \dfrac{1 \times 8.314 \times 273}{1.013 \times {10}^{5} }$

$\dashrightarrow \sf V = 0.0224 \: {m}^{3}$

$\dashrightarrow \sf V = 22.4 \: litres$

Discussion

35.	The half life of a drug that decomposes by firstorder is 55 days. Calculate k1and shelf life.
Answer» ANSWER: GRAVITY, ALSO called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass EXERTS on them. Gravity is measured by the acceleration that it gives to freely falling OBJECTS.

35.

The half life of a drug that decomposes by firstorder is 55 days. Calculate k1and shelf life.

Answer»

ANSWER:

GRAVITY, ALSO called gravitation, in mechanics, the universal force of attraction acting between all matter. ... On Earth all bodies have a weight, or downward force of gravity, proportional to their mass, which Earth's mass EXERTS on them. Gravity is measured by the acceleration that it gives to freely falling OBJECTS.

Discussion

36.	III IILS.दूर स्थित वस्तु के प्रतिबिम्ब को प्राप्त कर अवतल दर्पणकी फोकस दूरी ज्ञात करें ।
Answer» ANSWER: Zydeco Explanation: Conk of dj shbdjaalam B E. U 3v3bu 3 K 3o3 evh3jvyf6cy4yvcyj88u8u3wt STUFF j H4i5h X3frfeff wasy3ubu3by363by3 3h3vg ghee yivvu ubbinchi

36.

III IILS.दूर स्थित वस्तु के प्रतिबिम्ब को प्राप्त कर अवतल दर्पणकी फोकस दूरी ज्ञात करें ।

Answer»

ANSWER:

Zydeco

Explanation:

Conk of dj shbdjaalam B E. U 3v3bu 3 K 3o3 evh3jvyf6cy4yvcyj88u8u3wt STUFF j

H4i5h

X3frfeff

wasy3ubu3by363by3 3h3vg ghee yivvu ubbinchi

Discussion

37.	A force of 100N is applied tangentially to a wheel of diameter 0.4m calculate the torque about the centre of the wheel.
Answer» Answer: 20NM Explanation: Torque=force X DISTANCE from AXIS of ROTATION Torque=20*.2 (r=d/2) T=20NM

37.

A force of 100N is applied tangentially to a wheel of diameter 0.4m calculate the torque about the centre of the wheel.

Answer»

Answer:

20NM

Explanation:

Torque=force X DISTANCE from AXIS of ROTATION

Torque=20*.2 (r=d/2)

T=20NM

Discussion

38.	What is the momentum in kgm/s of a 10kg truck traveling at 5m/s
Answer» ANSWER: MOMENTUM= 0.2× 5= 1 KG m/ s.

38.

What is the momentum in kgm/s of a 10kg truck traveling at 5m/s

Answer»

ANSWER:

MOMENTUM= 0.2× 5= 1 KG m/ s.

Discussion

39.	In the circuit diagram below, find(i) total resistance of the circuitO(ii) total current flowing in the circuit.(iii) Potential difference across R1. [C.B.S.E. 1990, 1993]7.2 $2A12 2+19. An electric lamp of 100 12, a toaster of resistance 5012, and a waterraci
Answer» Answer: A driver of a car travelling at 52 km h-¹ applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. ANOTHER driver going at 3 km h-¹ in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the SPEED VERSUS time graphs for the two cars. Which of the two cars travelled further after the brakes were applied?

39.

In the circuit diagram below, find(i) total resistance of the circuitO(ii) total current flowing in the circuit.(iii) Potential difference across R1. [C.B.S.E. 1990, 1993]7.2 $2A12 2+19. An electric lamp of 100 12, a toaster of resistance 5012, and a waterraci

Answer»

Answer:

A driver of a car travelling at 52 km h-¹ applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. ANOTHER driver going at 3 km h-¹ in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the SPEED VERSUS time graphs for the two cars. Which of the two cars travelled further after the brakes were applied?

Discussion

40.	14. A sphere of radius R rolls without slipping on a horizontal road.A, B, C and D are four points on the vertical line through thepoint of contact 'A' (Fig. 2). What are the translational velocities
Answer» ANSWER: TRY USING it Explanation: HOPE this HELPS

40.

14. A sphere of radius R rolls without slipping on a horizontal road.A, B, C and D are four points on the vertical line through thepoint of contact 'A' (Fig. 2). What are the translational velocities

Answer»

ANSWER:

TRY USING it

Explanation:

HOPE this HELPS

Discussion

41.	Resistance across ppint p and
Answer» ANSWER: PLEASE MARK me as BRAINIEST

41.

Resistance across ppint p and

Answer»

ANSWER:

PLEASE MARK me as BRAINIEST

Discussion

42.	Find angular momentum about earth
Answer» Answer: L=Iω=2MR2ω5 L = I ω = 2 M R 2 ω 5 . Earth's mass M is 5.979 × 1024 KG and its radius R is 6.376 × 106 m. The Earth's angular velocity ω is, of course, exactly ONE REVOLUTION per day, but we MUST covert ω to RADIANS per second to do the calculation in SI units.

42.

Find angular momentum about earth

Answer»

Answer:

L=Iω=2MR2ω5 L = I ω = 2 M R 2 ω 5 . Earth's mass M is 5.979 × 1024 KG and its radius R is 6.376 × 106 m. The Earth's angular velocity ω is, of course, exactly ONE REVOLUTION per day, but we MUST covert ω to RADIANS per second to do the calculation in SI units.

Discussion

43.	The focal length of a lens suggest to a person with an eye defect is 100cm Find the power of cell
Answer» Explanation: The focal LENGTH of a lens SUGGEST to a person with an eye defect is 100CM Find the POWER of cell

43.

The focal length of a lens suggest to a person with an eye defect is 100cm Find the power of cell

Answer»

Explanation:

The focal LENGTH of a lens SUGGEST to a person with an eye defect is 100CM Find the POWER of cell

Discussion

44.	Four alternatives are given for each of the following questions. Choose the correctalternative and write the complete answer along with its letter of alphabet. 3x11. The device used to measure the current isa) galvanometer b) ammeter c) voltmeter d) rheostat2. Which of the following is not a characteristic of magnetic lines of force?a) emerge from North poleb) intersect each otherc) merge in South poled) do not intersect each other3. Which type of lens you prefer to use in reading small words in newspapea) concave lens with focal length 50 cmb) convex lens with focal length 50 cmc) concave lens with focal length 5cmd) convex lens with focal length 5 cmAnswer the following questions:4. Power of a lens is 2 diopter. What does it mean?5. In which point of a lens the light ray do not bend?Answer the following questions:6. On what factors did the resistance of a conductor depends?7. Draw a ray diagram of image formed when an object is placed beyfront of a concave lens8. Compare the power used in in each of the following;a) 6-volt battery in series with 1 ohm and 2-ohm resistorsb)4-volt battery in parallel with 12 ohm and 2-ohm resistAnswer the following questions:9. Draw a neat diagram of electric motor and label carbon brusheulnin neyneriment to show convex lens converges light rIV.
Answer» Explanation: 1. The device used to measure the current is a) galvanometer. 2. Which of the following is not a characteristic of magnetic lines of force? a) EMERGE from North pole b) intersect each other c) merge in South pole d) do not intersect each other 3. Which type of lens you prefer to USE in reading small words in NEWSPAPER* ( prevalent spelling error) a) concave lens with focal length 50 cm b) convex lens with focal length 50 cm c) concave lens with focal length 5cm d) convex lens with focal length 5 cm 4. Power of a lens is 2 DIOPTER. This means that the focal length of the lens is 1/2 metres. 5. The light ray does not bend when it passes through optical center of the lens. 6. Resistance of conductor depends on the Resistivity, length of the conductor and the area if the conductor. 8. a)Voltage = 6V Resistance = 1+2 = 3A Power = V²/R = 12W b) Resistance = (1/12 + 1/2)'s Reciprocal = 12/7 Ohm 4²/(12/7) = 9.33 W $.$

44.

Four alternatives are given for each of the following questions. Choose the correctalternative and write the complete answer along with its letter of alphabet. 3x11. The device used to measure the current isa) galvanometer b) ammeter c) voltmeter d) rheostat2. Which of the following is not a characteristic of magnetic lines of force?a) emerge from North poleb) intersect each otherc) merge in South poled) do not intersect each other3. Which type of lens you prefer to use in reading small words in newspapea) concave lens with focal length 50 cmb) convex lens with focal length 50 cmc) concave lens with focal length 5cmd) convex lens with focal length 5 cmAnswer the following questions:4. Power of a lens is 2 diopter. What does it mean?5. In which point of a lens the light ray do not bend?Answer the following questions:6. On what factors did the resistance of a conductor depends?7. Draw a ray diagram of image formed when an object is placed beyfront of a concave lens8. Compare the power used in in each of the following;a) 6-volt battery in series with 1 ohm and 2-ohm resistorsb)4-volt battery in parallel with 12 ohm and 2-ohm resistAnswer the following questions:9. Draw a neat diagram of electric motor and label carbon brusheulnin neyneriment to show convex lens converges light rIV.

Answer»

Explanation:

1. The device used to measure the current is a) galvanometer.

2. Which of the following is not a characteristic of magnetic lines of force?

a) EMERGE from North pole

b) intersect each other

c) merge in South pole

d) do not intersect each other

3. Which type of lens you prefer to USE in reading small words in NEWSPAPER* ( prevalent spelling error)

a) concave lens with focal length 50 cm

b) convex lens with focal length 50 cm

c) concave lens with focal length 5cm

d) convex lens with focal length 5 cm

4. Power of a lens is 2 DIOPTER. This means that the focal length of the lens is 1/2 metres.

5. The light ray does not bend when it passes through optical center of the lens.

6. Resistance of conductor depends on the Resistivity, length of the conductor and the area if the conductor.

8. a)Voltage = 6V

Resistance = 1+2 = 3A

Power = V²/R = 12W

b) Resistance = (1/12 + 1/2)'s Reciprocal

= 12/7 Ohm

4²/(12/7)

= 9.33 W $.$

Discussion

45.	Tell me the velocity of sound ?
Answer» Explanation: The SPEED of sound is the distance travelled per unit of time by a sound WAVE as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in AIR is about 343 metres per SECOND (1,235 km/h; 1,125 ft/s; 767 MPH; 667 kn), or a kilometre in 2.9 s or a mile in 4.7 s.

45.

Tell me the velocity of sound ?

Answer»

Explanation:

The SPEED of sound is the distance travelled per unit of time by a sound WAVE as it propagates through an elastic medium. At 20 °C (68 °F), the speed of sound in AIR is about 343 metres per SECOND (1,235 km/h; 1,125 ft/s; 767 MPH; 667 kn), or a kilometre in 2.9 s or a mile in 4.7 s.

Discussion

46.	A turntable that is initially at rest is set in motion with a constant angular acceleration aA. What is the angular velocity after it has completed 1 revolution?B. How much time will it take to complete 1 revolution?
Answer» EXPLANATION: A. W² - w² = 2 a theta W² - w² = 2 a n2π W² - 0 = 2 a X 1 x 2 π W. = √( 4πa) B. W = w + at √(4πa) = 0 + at t = √(4πa) /a

46.

A turntable that is initially at rest is set in motion with a constant angular acceleration aA. What is the angular velocity after it has completed 1 revolution?B. How much time will it take to complete 1 revolution?

Answer»

EXPLANATION:

A. W² - w² = 2 a theta

W² - w² = 2 a n2π

W² - 0 = 2 a X 1 x 2 π

W. = √( 4πa)

B. W = w + at

√(4πa) = 0 + at

t = √(4πa) /a

Discussion

47.	A formulation was found to degrade according to first order kinetics. The initial concentration is100 unit/mL. The specific decomposition rate obtained from an Arrhenius plot at 25°C is 2.01x10-5 h-1. Earlier experiment have shown that when concentration fall below 70 units/mL, the product is not suitable for consumption. What should be the expiration period for formulation?A formulation was found to degrade according to first order kinetics. The initial concentration is 100 unit/mL. The specific decomposition rate obtained from an Arrhenius plot at 25°C is 2.01x10-5 h-1. Earlier experiment have shown that when concentration fall below 70 units/mL, the product is not suitable for consumption. What should be the expiration period for formulation?
Answer» ANSWER: PLEASE BRAINLEAST me for my answer

47.

A formulation was found to degrade according to first order kinetics. The initial concentration is100 unit/mL. The specific decomposition rate obtained from an Arrhenius plot at 25°C is 2.01x10-5 h-1. Earlier experiment have shown that when concentration fall below 70 units/mL, the product is not suitable for consumption. What should be the expiration period for formulation?A formulation was found to degrade according to first order kinetics. The initial concentration is 100 unit/mL. The specific decomposition rate obtained from an Arrhenius plot at 25°C is 2.01x10-5 h-1. Earlier experiment have shown that when concentration fall below 70 units/mL, the product is not suitable for consumption. What should be the expiration period for formulation?

Answer»

ANSWER:

PLEASE BRAINLEAST me for my answer

Discussion

48.	Speed of sound depends upon (a) Temperature of the medium (b) Pressure of the medium (c) Temperature of source producing sound (d) Temperature and pressure of medium
Answer» Explanation: The speed of SOUND VARIES greatly depending upon the MEDIUM it is traveling through. The speed of sound in a medium is determined by a combination of the medium's rigidity (or compressibility in gases) and its DENSITY. The more RIGID (or less compressible) the medium, the faster the speed of sound.

48.

Speed of sound depends upon (a) Temperature of the medium (b) Pressure of the medium (c) Temperature of source producing sound (d) Temperature and pressure of medium

Answer»

Explanation:

The speed of SOUND VARIES greatly depending upon the MEDIUM it is traveling through. The speed of sound in a medium is determined by a combination of the medium's rigidity (or compressibility in gases) and its DENSITY. The more RIGID (or less compressible) the medium, the faster the speed of sound.

Discussion

49.	ऋणात्मक कार्य को एक उदाहरण द्वारा स्पष्ट कीजिए
Answer» ANSWER: जब वस्तु के विस्थापन की विपरीत दिशा में बल लगाया जाता है, तो किया गया कार्य ऋणात्मक होता है। मान लिया कि एक कार एक समान वेग से किसी खास दिशा में जा रही है और ड्राइवर ब्रेक लगाता है जिससे कुछ दूरी के बार कार रूक जाती है।

49.

ऋणात्मक कार्य को एक उदाहरण द्वारा स्पष्ट कीजिए

Answer»

ANSWER:

जब वस्तु के विस्थापन की विपरीत दिशा में बल लगाया जाता है, तो किया गया कार्य ऋणात्मक होता है। मान लिया कि एक कार एक समान वेग से किसी खास दिशा में जा रही है और ड्राइवर ब्रेक लगाता है जिससे कुछ दूरी के बार कार रूक जाती है।

Discussion

50.	For a particle executing (undamped) simple harmonic oscillations, draw a graph showing the variation of its displacement (y) , (from the mean position) with the time (t) .
Answer» ANSWER: SORRY I DINT UNDERSTAND the QUESTION

50.

For a particle executing (undamped) simple harmonic oscillations, draw a graph showing the variation of its displacement (y) , (from the mean position) with the time (t) .

Answer»

ANSWER:

SORRY I DINT UNDERSTAND the QUESTION

Discussion

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H4i5h

X3frfeff

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ऋणात्मक कार्य को एक उदाहरण द्वारा स्पष्ट कीजिए

For a particle executing (undamped) simple harmonic oscillations, draw a graph showing the variation of its displacement (y) , (from the mean position) with the time (t) .