67486 + Interview Questions in Secondary School in Physics

1.	The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and stated its two properties?
Answer» Answer: A magnetic material having RELATIVE permeability of 800 would be CLASSIFIED as a FERROMAGNET. A few examples of such material include iron and nickel. Its two properties are: All ferromagnetic materials become paramagnetic when heated to a temperature above the Curie temperature. These materials show a strong attraction towards magnetic fields and have a TENDENCY to become MAGNETS themselves.

1.

The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and stated its two properties?

Answer»

Answer:

A magnetic material having RELATIVE permeability of 800 would be CLASSIFIED as a FERROMAGNET. A few examples of such material include iron and nickel.

Its two properties are:

All ferromagnetic materials become paramagnetic when heated to a temperature above the Curie temperature.
These materials show a strong attraction towards magnetic fields and have a TENDENCY to become MAGNETS themselves.

Discussion

2.	two particle emitting from a source of have a displacement r1=4i+3j+8k and r2=2i+10j+5k ,at any time ,calculate to the displacement of the second particle relatives to the first particle?
Answer» ANSWER: I didn't KNOW the answer but PLEASE VOTE me as brainleist Explanation: gwu-fvyh-dji

2.

two particle emitting from a source of have a displacement r1=4i+3j+8k and r2=2i+10j+5k ,at any time ,calculate to the displacement of the second particle relatives to the first particle?

Answer»

ANSWER:

I didn't KNOW the answer but PLEASE VOTE me as brainleist

Explanation:

gwu-fvyh-dji

Discussion

3.	Write s.l unit of gravitational constant G
Answer» Answer: Newtons kg In SI units, G has the value 6.67 × 10-11 Newtons kg-2 M2. The direction of the force is in a straight line between the two bodies and is attractive. THUS, an apple falls from a tree because it feels the GRAVITATIONAL force of the Earth and is THEREFORE subject to “gravity”.

3.

Write s.l unit of gravitational constant G

Answer»

Answer:

Newtons kg

In SI units, G has the value 6.67 × 10-11 Newtons kg-2 M2. The direction of the force is in a straight line between the two bodies and is attractive. THUS, an apple falls from a tree because it feels the GRAVITATIONAL force of the Earth and is THEREFORE subject to “gravity”.

Discussion

4.	What is wind energy ?
Answer» $\huge\underline{\overline{\mid{\bold{\blue{\mathcal{ANSWER}}\mid}}}}$ Wind POWER or wind energy is the use of wind to provide mechanical power through wind turbines to turn electric GENERATORS for electrical power. Wind power is a popular sustainable, RENEWABLE source of power that has a much smaller impact on the environment compared to BURNING fossil fuels.

4.

What is wind energy ?

Answer»

$\huge\underline{\overline{\mid{\bold{\blue{\mathcal{ANSWER}}\mid}}}}$

Wind POWER or wind energy is the use of wind to provide mechanical power through wind turbines to turn electric GENERATORS for electrical power. Wind power is a popular sustainable, RENEWABLE source of power that has a much smaller impact on the environment compared to BURNING fossil fuels.

Discussion

5.	A man is walking at a speed 3 m/s rain drops are faling vertically with a speed 3 m/s
Answer» ANSWER: Very very GOOD EVENING BRO HOU are you

5.

A man is walking at a speed 3 m/s rain drops are faling vertically with a speed 3 m/s

Answer»

ANSWER:

Very very GOOD EVENING BRO HOU are you

Discussion

6.	● Derive the mathematical formula of conservation of momentum. ▪︎Note:-Wrong answer will reported on spot..!!!Correct answer with quality explanation will appreciated and mark as brainliest...!!!
Answer» ★ Concept :- Here the concept of LAW of Conservation of MOVEMENTUM has been used. We see that here we have to derive the mathematical FORMULA of Law of Conservation of Momentum. So firstly we can assume two bodies whose CHANGE in moment we can find out. And then using the relationship of Force, we can find out the force exerted on the bodies by each other. And then we can apply the Newton's Third of Motion and then find the answer. Let's do it !! ______________________________________ ★ Formula Used :- $\;\boxed{\sf{\pink{Force\;=\;\bf{\dfrac{Change\;in\; Momentum}{Time}}}}}$ ______________________________________ ★ Solution :- Let the two bodies be 1 and 2 where the body 1 collides with 2 where 1 and 2 both are in motion. Initial velocity of 1 = u₁ Mass of 1 = m₁ Final velocity of 1 = v₁ Initial velocity of 2 = u₂ Mass of 2 = m₂ Final velocity of 2 = v₂ Force exerted by 1 on 2 = F₁₂ Force exerted by 2 on 1 = F₂₁ Time taken = t ______________________________________ ~ For Change in Momentum of both bodies :: → Change in Momentum = Final Momentum - Initial Momentum • For 1 :: ›»› Change in Momentum of 1 = m₁v₁ - m₁u₁ • For 2 :: ›»› Change in Momentum of 2 = m₂v₂ - m₂u₂ (since, momentum = mass × velocity) ______________________________________ ~ For Force exerted by bodies :: We know that, $\;\sf{\rightarrow\;\;Force\;=\;\bf{\dfrac{Change\;in\;Momentum}{Time}}}$ • For F₁₂ :- $\;\sf{\rightarrow\;\;\green{F_{12}\;=\;\bf{\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}}}}$ • For F₂₁ :- $\;\sf{\rightarrow\;\;\blue{F_{21}\;=\;\bf{\dfrac{m_{2}v_{2}\:-\:m_{2}u_{2}}{t}}}}$ ______________________________________ ~ For the Final Derivation :: By Newton's Third Law of Motion, every action has an equal and opposite reaction. This means after collision, the MAGNITUDE of F₁₂ will be equal to F₂₁ but different in magnitude. So, $\;\bf{\mapsto\;\;F_{12}\;=\;-\:F_{21}}$ By applying values, we get $\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;-\bigg(\dfrac{m_{2}v_{2}\:-\:m_{2}u_{2}}{t}\bigg)}$ $\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;\dfrac{-(m_{2}v_{2}\:-\:m_{2}u_{2})}{t}}$ $\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;\dfrac{m_{2}u_{2}\:-\:m_{2}v_{2}}{t}}$ Cancelling t from both sides, we get $\;\bf{\mapsto\;\;m_{1}v_{1}\:-\:m_{1}u_{1}\;=\;m_{2}u_{2}\:-\:m_{2}v_{2}}$ $\;\bf{\mapsto\;\;\red{m_{1}u_{1}\:+\:m_{2}u_{2}\;=\;m_{1}v_{1}\:+\:m_{2}v_{2}}}$ This is the final answer. $\;\bf{\mapsto\;\;\purple{m_{1}u_{1}\:+\:m_{2}u_{2}\;=\;m_{1}v_{1}\:+\:m_{2}v_{2}}}$ Hence, Derived. ________________________________

6.

● Derive the mathematical formula of conservation of momentum. ▪︎Note:-Wrong answer will reported on spot..!!!Correct answer with quality explanation will appreciated and mark as brainliest...!!!

Answer»

★ Concept :-

Here the concept of LAW of Conservation of MOVEMENTUM has been used. We see that here we have to derive the mathematical FORMULA of Law of Conservation of Momentum. So firstly we can assume two bodies whose CHANGE in moment we can find out. And then using the relationship of Force, we can find out the force exerted on the bodies by each other. And then we can apply the Newton's Third of Motion and then find the answer.

Let's do it !!

______________________________________

★ Formula Used :-

$\;\boxed{\sf{\pink{Force\;=\;\bf{\dfrac{Change\;in\; Momentum}{Time}}}}}$

______________________________________

★ Solution :-

Let the two bodies be 1 and 2 where the body 1 collides with 2 where 1 and 2 both are in motion.

Initial velocity of 1 = u₁

Mass of 1 = m₁

Final velocity of 1 = v₁

Initial velocity of 2 = u₂

Mass of 2 = m₂

Final velocity of 2 = v₂

Force exerted by 1 on 2 = F₁₂

Force exerted by 2 on 1 = F₂₁

Time taken = t

______________________________________

~ For Change in Momentum of both bodies ::

→ Change in Momentum = Final Momentum - Initial Momentum

• For 1 ::

›»› Change in Momentum of 1 = m₁v₁ - m₁u₁

• For 2 ::

›»› Change in Momentum of 2 = m₂v₂ - m₂u₂

(since, momentum = mass × velocity)

______________________________________

~ For Force exerted by bodies ::

We know that,

$\;\sf{\rightarrow\;\;Force\;=\;\bf{\dfrac{Change\;in\;Momentum}{Time}}}$

• For F₁₂ :-

$\;\sf{\rightarrow\;\;\green{F_{12}\;=\;\bf{\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}}}}$

• For F₂₁ :-

$\;\sf{\rightarrow\;\;\blue{F_{21}\;=\;\bf{\dfrac{m_{2}v_{2}\:-\:m_{2}u_{2}}{t}}}}$

______________________________________

~ For the Final Derivation ::

By Newton's Third Law of Motion, every action has an equal and opposite reaction.

This means after collision, the MAGNITUDE of F₁₂ will be equal to F₂₁ but different in magnitude. So,

$\;\bf{\mapsto\;\;F_{12}\;=\;-\:F_{21}}$

By applying values, we get

$\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;-\bigg(\dfrac{m_{2}v_{2}\:-\:m_{2}u_{2}}{t}\bigg)}$

$\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;\dfrac{-(m_{2}v_{2}\:-\:m_{2}u_{2})}{t}}$

$\;\bf{\mapsto\;\;\dfrac{m_{1}v_{1}\:-\:m_{1}u_{1}}{t}\;=\;\dfrac{m_{2}u_{2}\:-\:m_{2}v_{2}}{t}}$

Cancelling t from both sides, we get

$\;\bf{\mapsto\;\;m_{1}v_{1}\:-\:m_{1}u_{1}\;=\;m_{2}u_{2}\:-\:m_{2}v_{2}}$

$\;\bf{\mapsto\;\;\red{m_{1}u_{1}\:+\:m_{2}u_{2}\;=\;m_{1}v_{1}\:+\:m_{2}v_{2}}}$

This is the final answer.

$\;\bf{\mapsto\;\;\purple{m_{1}u_{1}\:+\:m_{2}u_{2}\;=\;m_{1}v_{1}\:+\:m_{2}v_{2}}}$

Hence, Derived.

________________________________

Discussion

7.	What would cause a moving object change its direction?(a) A force applied in the direction of motion(b) A force applied opposite the direction of motion(c) A force applied at an angle to the line of motion(d) None of these
Answer» ANSWER: (a) HAI SHAYD is KA answer

7.

What would cause a moving object change its direction?(a) A force applied in the direction of motion(b) A force applied opposite the direction of motion(c) A force applied at an angle to the line of motion(d) None of these

Answer»

ANSWER:

(a) HAI SHAYD is KA answer

Discussion

8.	What is electric motor ?
Answer» $\huge\color{orange}\star\:\tt\pink{Answer}\:\star$ An electric motor is an electrical machine that converts electrical energy into mechanical energy. ... Electric motors can be POWERED by direct current (DC) sources, such as from BATTERIES, motor VEHICLES or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical GENERATORS.

8.

What is electric motor ?

Answer»

$\huge\color{orange}\star\:\tt\pink{Answer}\:\star$

An electric motor is an electrical machine that converts electrical energy into mechanical energy. ... Electric motors can be POWERED by direct current (DC) sources, such as from BATTERIES, motor VEHICLES or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical GENERATORS.

Discussion

9.	Derive the relation between magnetic field intensity (H) and magnetization (M) for a magnetic material placed in a magnetizing field.
Answer» Answer: MAGNETIC INTENSITY and magnetization are related by the RELATION m = ×H also μ = μo ( 1 + x ) μr μo μr = 1 + x

9.

Derive the relation between magnetic field intensity (H) and magnetization (M) for a magnetic material placed in a magnetizing field.

Answer»

Answer:

MAGNETIC INTENSITY and magnetization are related by the RELATION

m = ×H

also μ = μo ( 1 + x ) μr μo

μr = 1 + x

Discussion

10.	How can you stop a moving object?(a) By applying a sufficient force in the opposite direction(b) You cannot stop a moving object at all(C) By never allowing it to move in the first place(d) By applying a sufficient force in the same direction
Answer» OPTION a is the CORRECT ANSWER. HOPE this will be HELPFUL to you

10.

How can you stop a moving object?(a) By applying a sufficient force in the opposite direction(b) You cannot stop a moving object at all(C) By never allowing it to move in the first place(d) By applying a sufficient force in the same direction

Answer»

OPTION a is the CORRECT ANSWER.

HOPE this will be HELPFUL to you

Discussion

11.	State the underlying principle of a transformer. How is the large scale transmission of electric energy over long distances done with the use of transformers ?
Answer» Answer: Transformers is a DEVICE which converts high VOLTAGE AC into LOW voltage AC and vice versa. It is based on the principle of mutual induction. When alternating current is passed through a coil, an induced emf is set up in the neighbouring coil. Transformers are used for transmission of electrical energy over long distances. It set up the OUTPUT voltage of power plant using step up transformer which REDUCES the current and increase the voltage and hence reduce resistive power loss. Then a step down transformer is used this consumer and to step down the voltage and to increase the current.

11.

State the underlying principle of a transformer. How is the large scale transmission of electric energy over long distances done with the use of transformers ?

Answer»

Answer:

Transformers is a DEVICE which converts high VOLTAGE AC into LOW voltage AC and vice versa. It is based on the principle of mutual induction. When alternating current is passed through a coil, an induced emf is set up in the neighbouring coil.

Transformers are used for transmission of electrical energy over long distances.

It set up the OUTPUT voltage of power plant using step up transformer which REDUCES the current and increase the voltage and hence reduce resistive power loss. Then a step down transformer is used this consumer and to step down the voltage and to increase the current.

Discussion

12.	Write about reaction of acids with metal oxides
Answer» Explanation: METALLIC oxides react with acids to give salts and water. ... After the reaction TAKES place the colour of the SOLUTION becomes blue-green DUE to the formation of copper (II) chloride and the copper oxide dissolves. This proves that metallic oxides are basic oxides.

12.

Write about reaction of acids with metal oxides

Answer»

Explanation:

METALLIC oxides react with acids to give salts and water. ... After the reaction TAKES place the colour of the SOLUTION becomes blue-green DUE to the formation of copper (II) chloride and the copper oxide dissolves. This proves that metallic oxides are basic oxides.

Discussion

13.	A 30-turn circular coil of radius 4.00 cm and resistance 1.00 V is placed in a magnetic field directed perpendicular to theplane of the coil. The magnitude of the magnetic field varies in time according to the expression B 5 0.010 0t 1 0.040 0t 2,where B is in Tesla and t is in seconds. Calculate the induced emf in the coil at t 5 5.00 s
Answer» Given: Number of turns of the coil = 30 turns, The radius of the coil = 4.00cm = 0.04m Resistance = 1 ohm, The angle between the area and vector and the magnetic field = 0° The given expression of the magnetic field is $B = 0.010t+0.040t^{2}$ Find: Here we have to calculate the emf in the coil at t = 5seconds Solution: Now, According to Faraday's LAW, The INDUCED emf in a CLOSED loop is equal to the negative time of the rate of change of the magnetic flux through the loop. $\varepsilon = - \dfrac{d\phi_{B} }{dt}$ For number of turns, $\varepsilon = - N\dfrac{d\phi_{B} }{dt}$ The magnetic flux across the plane of area A, and in a UNIFORM magnetic field B $\phi_{B} = ABcos\theta$ Now, we PUT the value of the magnetic flux in faraday's law expression $\varepsilon = N\dfrac{d\(BAcos\theta }{dt}$ $\varepsilon = NAcos\theta\dfrac{d\-{B} }{dt}$ Now, we put the value of the magnetic field, $\varepsilon = NAcos\theta\dfrac{d\-{(0.010t+0.040t^{2} } )}{dt}$ Now, differentiate $\varepsilon = NAcos\theta(0.010+0.080t)$ Now, put t = 5 seconds $\varepsilon = NAcos\theta(0.010+0.080\times5)$ $\varepsilon = 30\times\pi\times0.04^{2} cos0^{\circ} (0.010+0.080\times5)$ $\varepsilon = 30\times3.14\times0.0016 \times1 (0.010+0.4)\\\varepsilon = 0.15072 (0.41)\\\\\varepsilon = 0.0617952V\\\\$ So, the induced emf in the coil at 5 seconds is 0.0617952V

13.

A 30-turn circular coil of radius 4.00 cm and resistance 1.00 V is placed in a magnetic field directed perpendicular to theplane of the coil. The magnitude of the magnetic field varies in time according to the expression B 5 0.010 0t 1 0.040 0t 2,where B is in Tesla and t is in seconds. Calculate the induced emf in the coil at t 5 5.00 s

Answer»

Given: Number of turns of the coil = 30 turns,

The radius of the coil = 4.00cm = 0.04m

Resistance = 1 ohm,

The angle between the area and vector and the magnetic field = 0°

The given expression of the magnetic field is $B = 0.010t+0.040t^{2}$

Find: Here we have to calculate the emf in the coil at t = 5seconds

Solution:

Now, According to Faraday's LAW,

The INDUCED emf in a CLOSED loop is equal to the negative time of the rate of change of the magnetic flux through the loop.

$\varepsilon = - \dfrac{d\phi_{B} }{dt}$

For number of turns,

$\varepsilon = - N\dfrac{d\phi_{B} }{dt}$

The magnetic flux across the plane of area A, and in a UNIFORM magnetic field B

$\phi_{B} = ABcos\theta$

Now, we PUT the value of the magnetic flux in faraday's law expression

$\varepsilon = N\dfrac{d\(BAcos\theta }{dt}$

$\varepsilon = NAcos\theta\dfrac{d\-{B} }{dt}$

Now, we put the value of the magnetic field,

$\varepsilon = NAcos\theta\dfrac{d\-{(0.010t+0.040t^{2} } )}{dt}$

Now, differentiate

$\varepsilon = NAcos\theta(0.010+0.080t)$

Now, put t = 5 seconds

$\varepsilon = NAcos\theta(0.010+0.080\times5)$

$\varepsilon = 30\times\pi\times0.04^{2} cos0^{\circ} (0.010+0.080\times5)$

$\varepsilon = 30\times3.14\times0.0016 \times1 (0.010+0.4)\\\varepsilon = 0.15072 (0.41)\\\\\varepsilon = 0.0617952V\\\\$

So, the induced emf in the coil at 5 seconds is 0.0617952V

Discussion

14.	Pariklan ka gadan calleulain
Answer» ANSWER: HELLO hello hello hello hello hello please FRIENDS COME for link bae-rtap-qfr

14.

Pariklan ka gadan calleulain

Answer»

ANSWER:

HELLO hello hello hello hello hello

please FRIENDS COME for link

bae-rtap-qfr

Discussion

15.	State the postulates of einsteins theory of relativity
Answer» POSTULATES OF SPECIAL RELATIVITY 1. Principle of Relativity – All the laws of physics are the same in all inertial reference frames. 2. The SPEED of light in a VACUUM is the same (3.0 x108 m/s) in all inertial reference frames regardless of the motion of the OBSERVER or source. Consequences of Special Relativity a) There is no such thing as absolute length or absolute time in relativity. b) A time interval (or length) MEASUREMENT depends on the reference frame in which it is made. Hope this HELPS. Mark my answer as brainliest.

15.

State the postulates of einsteins theory of relativity

Answer»

POSTULATES OF SPECIAL RELATIVITY

1. Principle of Relativity – All the laws of physics are the same in all

inertial reference frames.

2. The SPEED of light in a VACUUM is the same (3.0 x108 m/s) in all

inertial reference frames regardless of the motion of the OBSERVER or

source.

Consequences of Special Relativity

a) There is no such thing as absolute length or absolute time in

relativity.

b) A time interval (or length) MEASUREMENT depends on the reference

frame in which it is made.

Hope this HELPS. Mark my answer as brainliest.

Discussion

16.	The temperature of an object _____________ due to absorption of heat
Answer» The TEMPERATURE of an OBJECT INCREASES DUE to the absorption of heat __________

Discussion

17.	In the figure shown r1 = 15ohm , r2 = 10ohm , r3 = 30 ohm , r4 = 5 ohm and r5 =20ohm and a 18 v battery is connected to the arrangement calculate the total resistance in the circuit solve the question
Answer» Answer: 18 Ω Explanation: REFER the attached FIGURE for the STEP by step solution. Also from NEXT time, please do post the QUESTION figure. Hoping that I have not made any mistakes, You're welcome. Hope you have found my answer useful. If my answer deserves a brainliest, do mark it. GeniusH

17.

In the figure shown r1 = 15ohm , r2 = 10ohm , r3 = 30 ohm , r4 = 5 ohm and r5 =20ohm and a 18 v battery is connected to the arrangement calculate the total resistance in the circuit solve the question

Answer»

Answer:

18 Ω

Explanation:

REFER the attached FIGURE for the STEP by step solution. Also from NEXT time, please do post the QUESTION figure.

Hoping that I have not made any mistakes, You're welcome.

Hope you have found my answer useful. If my answer deserves a brainliest, do mark it.

GeniusH

Discussion

18.	What do you understand by dependent population and active population
Answer» ANSWER: our ACTIVE POPULATION is HIGHER but not than CHINA

18.

What do you understand by dependent population and active population

Answer»

ANSWER:

our ACTIVE POPULATION is HIGHER but not than CHINA

Discussion

19.	(a) Maximum heat is absorbed bycoloured object.
Answer» ANSWER: BLACK EXPLANATION: HOPE it HELP you....

19.

(a) Maximum heat is absorbed bycoloured object.

Answer»

ANSWER:

BLACK

EXPLANATION:

HOPE it HELP you....

Discussion

20.	Putlee ki sije ko kaun niyantrit karta hai
Answer» In physics, a force is any interaction that, when unopposed, will change the MOTION of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described INTUITIVELY as a PUSH or a pull. A force has both magnitude and direction, making it a vector QUANTITY

Discussion

21.	What is physical science
Answer» ANSWER: Physical science is the study of the inorganic world. (Those are studied in biological, or life, science.) The four main branches of physical science are ASTRONOMY, PHYSICS, CHEMISTRY, and the Earth sciences, which include meteorology and geology... hope its helpful #kritika

21.

What is physical science

Answer»

ANSWER:

Physical science is the study of the inorganic world. (Those are studied in biological, or life, science.) The four main branches of physical science are ASTRONOMY, PHYSICS, CHEMISTRY, and the Earth sciences, which include meteorology and geology...

hope its helpful

#kritika

Discussion

22.	Please reply answer
Answer» ANSWER: a blend of Hindi and ENGLISH, in particular a variety of English used by speakers of Hindi, characterized by frequent USE of Hindi vocabulary or constructions.

22.

Please reply answer

Answer»

ANSWER:

a blend of Hindi and ENGLISH, in particular a variety of English used by speakers of Hindi, characterized by frequent USE of Hindi vocabulary or constructions.

Discussion

23.	Vues:1031(a) A body is acted upon by a force. State two conditions under which the work done could be zero
Answer» Answer: with BALANCE forces or when the BODY is not able to MOVE as the force applied to move it is LESS as compaired to that requirdd by body to move.

23.

Vues:1031(a) A body is acted upon by a force. State two conditions under which the work done could be zero

Answer»

Answer:

with BALANCE forces or when the BODY is not able to MOVE as the force applied to move it is LESS as compaired to that requirdd by body to move.

Discussion

24.	Why photoelectric effect cannot be explained on the basis of wave nature of light ? give reason
Answer» Answer: Wave nature of radiation cannot explain the FOLLOWING: The immediate ejection of photoelectrons. The presence of threshold frequency for a metal surface. The that kinetic ENERGY of the emitted electrons is independent of the intensity of light and DEPENDS upon its frequency. Thus, the PHOTOELECTRIC effect cannot be explained on the BASIS of wave nature of light.

24.

Why photoelectric effect cannot be explained on the basis of wave nature of light ? give reason

Answer»

Answer:

Wave nature of radiation cannot explain the FOLLOWING:

The immediate ejection of photoelectrons.
The presence of threshold frequency for a metal surface.
The that kinetic ENERGY of the emitted electrons is independent of the intensity of light and DEPENDS upon its frequency.

Thus, the PHOTOELECTRIC effect cannot be explained on the BASIS of wave nature of light.

Discussion

25.	What is hydroelectric energy ?
Answer» $\huge\underbrace\mathfrak{ANSWER}$ Hydroelectricity, or HYDROELECTRIC power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all RENEWABLE electricity, and was expected to increase by about 3.1% each year for the NEXT 25 YEARS.

25.

What is hydroelectric energy ?

Answer»

$\huge\underbrace\mathfrak{ANSWER}$

Hydroelectricity, or HYDROELECTRIC power, is electricity produced from hydropower. In 2015, hydropower generated 16.6% of the world's total electricity and 70% of all RENEWABLE electricity, and was expected to increase by about 3.1% each year for the NEXT 25 YEARS.

Discussion

26.	(b) The mass of the sea water in the pool is 2.70 x 105kg.Calculate the density of the sea water. Give your answer to 3 significant figures.density =
Answer» ANSWER: ehfwgwudfsfhsdgsbfnvhhklgkdagdhfhdgwgdgsfscdhvgdvfhxvfbghfgdgag

26.

(b) The mass of the sea water in the pool is 2.70 x 105kg.Calculate the density of the sea water. Give your answer to 3 significant figures.density =

Answer»

ANSWER:

ehfwgwudfsfhsdgsbfnvhhklgkdagdhfhdgwgdgsfscdhvgdvfhxvfbghfgdgag

Discussion

27.	A body is projected with a velocity of 98 ms-l. If acceleration due to gravity be 9.8 m/s2, then
Answer» ANSWER: v=u+at v=98−9.8×5=98−49=49m/s

27.

A body is projected with a velocity of 98 ms-l. If acceleration due to gravity be 9.8 m/s2, then

Answer»

ANSWER:

v=u+at

v=98−9.8×5=98−49=49m/s

Discussion

28.	1. Figure A represents a circular disc in which a hole is made as shown in figure B.Figure AFigure BIf G is the centre of gravity of the original disc, does the centre of gravity of figure B get altereddue to the hole? Explain.
Answer» EXPLANATION: i am BUSY ANS AFTERWARDS

28.

1. Figure A represents a circular disc in which a hole is made as shown in figure B.Figure AFigure BIf G is the centre of gravity of the original disc, does the centre of gravity of figure B get altereddue to the hole? Explain.

Answer»

EXPLANATION:

i am BUSY ANS AFTERWARDS

Discussion

29.	What is Thermal power plant ?
Answer» $\huge\color{orange}\star\:\tt\pink{Answer}\:\star$ A thermal power station is a power station in which heat energy is converted to ELECTRICITY. TYPICALLY, WATER is heated into steam, which is used to drive an ELECTRICAL GENERATOR. After it passes through the turbine the steam is condensed in a steam condenser and recycled to where it was heated.

29.

What is Thermal power plant ?

Answer»

$\huge\color{orange}\star\:\tt\pink{Answer}\:\star$

A thermal power station is a power station in which heat energy is converted to ELECTRICITY. TYPICALLY, WATER is heated into steam, which is used to drive an ELECTRICAL GENERATOR. After it passes through the turbine the steam is condensed in a steam condenser and recycled to where it was heated.

Discussion

30.	The internal resistance force developed in the body are dash to the external force
Answer» Answer: Answer. The INTERNAL RESISTANCE which the the body offers to MEET with the load or EXTERNAL force is called Stress.

30.

The internal resistance force developed in the body are dash to the external force

Answer»

Answer:

Answer. The INTERNAL RESISTANCE which the the body offers to MEET with the load or EXTERNAL force is called Stress.

Discussion

31.	What is an arrowAnd how it is used in bar
Answer» Answer: They were important weapons of WAR from ancient history until the early modern period, where they were rendered INCREASINGLY OBSOLETE by the development of the more powerful and accurate FIREARMS, and were eventually dropped from WARFARE. Today, bows and arrows are mostly used for hunting and sports. Thank you Follow also

31.

What is an arrowAnd how it is used in bar

Answer»

Answer:

They were important weapons of WAR from ancient history until the early modern period, where they were rendered INCREASINGLY OBSOLETE by the development of the more powerful and accurate FIREARMS, and were eventually dropped from WARFARE. Today, bows and arrows are mostly used for hunting and sports.

Thank you

Follow also

Discussion

32.	What do you meant by inaccessible object?
Answer» ANSWER: the OBJECT which are not ACCESSIBLE is KNOWN as INACCESSIBLE object.

32.

What do you meant by inaccessible object?

Answer»

ANSWER:

the OBJECT which are not ACCESSIBLE is KNOWN as INACCESSIBLE object.

Discussion

33.	Find angel between vector a=2i+j-k, b=root2(i+j)
Answer» EXPLANATION: I can't understand your VECTOR B can you please REPLY what is vector B

33.

Find angel between vector a=2i+j-k, b=root2(i+j)

Answer»

EXPLANATION:

I can't understand your VECTOR B can you please REPLY what is vector B

Discussion

34.	Suggest a demagnetisation of above steel strip
Answer» Explanation: SMALL PIECE of steel can be STRUCK with a hammer to demagnetize it. Place the item on a hard, secure, non-metallic surface and hit it sharply a few times with a hammer. The shock of being struck transmits energy through the steel, which rearranges the order of its atoms and lowers its magnetic

34.

Suggest a demagnetisation of above steel strip

Answer»

Explanation:

SMALL PIECE of steel can be STRUCK with a hammer to demagnetize it. Place the item on a hard, secure, non-metallic surface and hit it sharply a few times with a hammer. The shock of being struck transmits energy through the steel, which rearranges the order of its atoms and lowers its magnetic

Discussion

35.	The work done in accelerating an object along a frictionless, horizontal surface is equal to which of the followings?a) the change in the objectтАЩs potential energy b) the change in the objectтАЩs momentum c) the change in the objectтАЩs kinetic energyd) the change in the objectтАЩs velocity
Answer» ANSWER: SORRY I don't KNOW sorry

35.

The work done in accelerating an object along a frictionless, horizontal surface is equal to which of the followings?a) the change in the objectтАЩs potential energy b) the change in the objectтАЩs momentum c) the change in the objectтАЩs kinetic energyd) the change in the objectтАЩs velocity

Answer»

ANSWER:

SORRY I don't KNOW sorry

Discussion

36.	पराबैगनी का अधिक उपयोग कहां है
Answer» EXPLANATION: पराबैंगनी किरणें त्वचा की ऊपरी परत के नीचे मौजूद कोलेजन (COLLAGEN: त्वचा के लिए एक जरूरी प्रोटीन) और संयोजी ऊतकों को नष्ट कर देती है, जिससे आपकी त्वचा में उम्र बढ़ने के लक्षण दिखने शुरू हो जाते हैं।

36.

पराबैगनी का अधिक उपयोग कहां है

Answer»

EXPLANATION:

पराबैंगनी किरणें त्वचा की ऊपरी परत के नीचे मौजूद कोलेजन (COLLAGEN: त्वचा के लिए एक जरूरी प्रोटीन) और संयोजी ऊतकों को नष्ट कर देती है, जिससे आपकी त्वचा में उम्र बढ़ने के लक्षण दिखने शुरू हो जाते हैं।

Discussion

37.	a projectile is fired with a velocity of 320 m/s at an angle of 30 to the horizontal. find the time to reach it's greatest height,
Answer» Explanation: Given: angle θ = 30˚ ; Initial velocity = 20m/s Solve for maximum height dymax = ? There are three equations to do this. The first EQUATION is solving for the initial vertical velocity; the second equation is solving for the time of RISE and the third equation is solving for the maximum height. Solving for the initial vertical velocity : initial vertical velocity = initial velocity * SIN 30 initial vertical velocity = 20 m/s * 0.5 initial vertical velocity = 10 m/s Solving for the time of rise time_up = initial vertical velocity / acceleration due to gravity time_up = 10 m/s / 9.8 m/s^2 time_up = 1.0204 seconds Solving for the maximum vertical height of rise dymax = Viy * t – 1/2 gt^2 dymax = 10 m/s * 1.0204 s – 4.9 m/s^2 * (1.0204 s)^2 dymax = 10.204 m – 4.9 * 1.0412 m dymax = 10.204 m – 5.10196 m dymax = 5.10 m The body rises up to a maximum height of 5.10 METERS.

37.

a projectile is fired with a velocity of 320 m/s at an angle of 30 to the horizontal. find the time to reach it's greatest height,

Answer»

Explanation:

Given: angle θ = 30˚ ; Initial velocity = 20m/s

Solve for maximum height dymax = ?

There are three equations to do this. The first EQUATION is solving for the

initial vertical velocity; the second equation is solving for the

time of RISE and the third equation is solving for the maximum height.

Solving for the initial vertical velocity :

initial vertical velocity = initial velocity * SIN 30

initial vertical velocity = 20 m/s * 0.5

initial vertical velocity = 10 m/s

Solving for the time of rise

time_up = initial vertical velocity / acceleration due to gravity

time_up = 10 m/s / 9.8 m/s^2

time_up = 1.0204 seconds

Solving for the maximum vertical height of rise

dymax = Viy * t – 1/2 gt^2

dymax = 10 m/s * 1.0204 s – 4.9 m/s^2 * (1.0204 s)^2

dymax = 10.204 m – 4.9 * 1.0412 m

dymax = 10.204 m – 5.10196 m

dymax = 5.10 m

The body rises up to a maximum height of 5.10 METERS.

Discussion

38.	Which instrument , based on a property of a magnets , is used to find directions?
Answer» Answer: COMPASS is the CORRECT answer PLS MARK ME THE BRAINLIEST

38.

Which instrument , based on a property of a magnets , is used to find directions?

Answer»

Answer:

COMPASS is the CORRECT answer

PLS MARK ME THE BRAINLIEST

Discussion

39.	Which of the following is not scale up process
Answer» Answer: PLEASE WRITE full question,where are the OPTIONS???

39.

Which of the following is not scale up process

Answer»

Answer:

PLEASE WRITE full question,where are the OPTIONS???

Discussion

40.	In a tabular for list 20 physical quantities with their base unit SI unit and symbol
Answer» Answer: This is a list of physical QUANTITIES. The FIRST table lists the base quantities USED in the International System of Units to DEFINE the physical dimension of physical quantities for DIMENSIONAL analysis. The second table lists the derived physical quantities. Derived quantities can be mentioned in terms of the base quantities.

40.

In a tabular for list 20 physical quantities with their base unit SI unit and symbol

Answer»

Answer:

This is a list of physical QUANTITIES.

The FIRST table lists the base quantities USED in the International System of Units to DEFINE the physical dimension of physical quantities for DIMENSIONAL analysis. The second table lists the derived physical quantities. Derived quantities can be mentioned in terms of the base quantities.

Discussion

41.	What is dimensional analysis?
Answer» Answer: dimensional analysis analysis USING the FACT that physical quantities ADDED to or equated with each other must be EXPRESSED in terms of the same fundamental quantities (such as mass, length, or time) for inferences to be made about the relations between them.

41.

What is dimensional analysis?

Answer»

Answer:

dimensional analysis

analysis USING the FACT that physical quantities ADDED to or equated with each other must be EXPRESSED in terms of the same fundamental quantities (such as mass, length, or time) for inferences to be made about the relations between them.

Discussion

42.	Can you tell how to find kinetic energy in full lenght
Answer» Answer: This EQUATION states that the kinetic energy (Ek) is equal to the integral of the DOT product of the velocity (V) of a body and the infinitesimal change of the body's MOMENTUM (p). EXPLANATION:

42.

Can you tell how to find kinetic energy in full lenght

Answer»

Answer:

This EQUATION states that the kinetic energy (Ek) is equal to the integral of the DOT product of the velocity (V) of a body and the infinitesimal change of the body's MOMENTUM (p).

EXPLANATION:

Discussion

43.	5V1Ω:2ΩAB1Ω32Ω2VFind out potential difference between point A andΒ.(1) 3.5V(2) 3V(3) 4 V(4) 5V
Answer» ANSWER: hwgfehwuwgeggahahssgahshsys Explanation: gaggagshshsggsgeysysgwjsjabsbkdksjshd

43.

5V1Ω:2ΩAB1Ω32Ω2VFind out potential difference between point A andΒ.(1) 3.5V(2) 3V(3) 4 V(4) 5V

Answer»

ANSWER:

hwgfehwuwgeggahahssgahshsys

Explanation:

gaggagshshsggsgeysysgwjsjabsbkdksjshd

Discussion

44.	Filling the blanks gravitational force is always _________ in nature
Answer» ANSWER: attractive Explanation: HOPE this answer will be USEFUL

44.

Filling the blanks gravitational force is always _________ in nature

Answer»

ANSWER:

attractive

Explanation:

HOPE this answer will be USEFUL

Discussion

45.	16. Calculate the effective resistance between the pointsA and B in the network shown below in Fig. 8.47.arawww2 0212 02wwwwww6 02www4 22wwwB5 02
Answer» EXPLANATION: HAHA I'm not WANT to be in the WORLD is not want to be in the world is not want

45.

16. Calculate the effective resistance between the pointsA and B in the network shown below in Fig. 8.47.arawww2 0212 02wwwwww6 02www4 22wwwB5 02

Answer»

EXPLANATION:

HAHA I'm not WANT to be in the WORLD is not want to be in the world is not want

Discussion

46.	Why fluid have no young modulus?fast. give perfect answers only
Answer» Answer: SORRY I didn't KNOW answer of this QUESTION YAAD hu YA bhul gya good morning

46.

Why fluid have no young modulus?fast. give perfect answers only

Answer»

Answer:

SORRY I didn't KNOW answer of this QUESTION

YAAD hu YA bhul gya

good morning

Discussion

47.	What is meant by fuel ?
Answer» Material such as coal, GAS, or oil that is BURNED to produce HEAT or POWER is called a FUEL

Discussion

48.	16.) Calculate the effective resistance between the pointnetwork shown below in Fig below2A m1202BA-WWWWWW2026025040
Answer» Answer: 127354hsy WWWWW Explanation: 40WWHWY2T2T2GEUEIW8

48.

16.) Calculate the effective resistance between the pointnetwork shown below in Fig below2A m1202BA-WWWWWW2026025040

Answer»

Answer:

127354hsy WWWWW

Explanation:

40WWHWY2T2T2GEUEIW8

Discussion

49.	a boy of mass 50kg climbs up 10step each of each height 0.2 in 15sec.calculate the power developed by the boy?
Answer» ANSWER: sorry Explanation: i do not KNOW the answer

49.

a boy of mass 50kg climbs up 10step each of each height 0.2 in 15sec.calculate the power developed by the boy?

Answer»

ANSWER:

sorry

Explanation:

i do not KNOW the answer

Discussion

50.	Compute the magnitude of the electric field on point Z which is 2m away east of a point charge (9uC). B) If a test charge of -2uC was placed on point Z, what would be the magnitude and direction of the force on it?
Answer» ANSWER: सोफी एक्स ऑक्स WA EX FL Explanation: do FL WA FL way ES CP FL दिकचिसिकॉको Go Go zip do गिविप es on ex on ex

50.

Compute the magnitude of the electric field on point Z which is 2m away east of a point charge (9uC). B) If a test charge of -2uC was placed on point Z, what would be the magnitude and direction of the force on it?

Answer»

ANSWER:

सोफी एक्स ऑक्स WA EX FL

Explanation:

do FL WA FL way ES CP FL दिकचिसिकॉको Go Go zip do गिविप es on ex on ex

Discussion

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पराबैगनी का अधिक उपयोग कहां है​

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Which instrument , based on a property of a magnets , is used to find directions?

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सोफी एक्स ऑक्स WA EX FL

do FL WA FL way ES CP FL दिकचिसिकॉको Go Go zip do गिविप es on ex on ex

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A man is walking at a speed 3 m/s rain drops are faling vertically with a speed 3 m/s

● Derive the mathematical formula of conservation of momentum. ▪︎Note:-Wrong answer will reported on spot..!!!Correct answer with quality explanation will appreciated and mark as brainliest...!!!

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Write about reaction of acids with metal oxides

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Please reply answer

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(b) The mass of the sea water in the pool is 2.70 x 105kg.Calculate the density of the sea water. Give your answer to 3 significant figures.density =

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