67486 + Interview Questions in Secondary School in Physics

1.	Under what conditions can a body travel a certain distance and yet it's resultana displacement be zero ?
Answer» Answer: If the body travels in STRAIGHT line and RETURNS back to the STARTING POINT it is said to have covered some distance but displacement is zero. As displacement is shortest distance between INITIAL and final position and here both are same so, displacement is zero. Explanation:

1.

Under what conditions can a body travel a certain distance and yet it's resultana displacement be zero ?

Answer»

Answer:

If the body travels in STRAIGHT line and RETURNS back to the STARTING POINT it is said to have covered some distance but displacement is zero.

As displacement is shortest distance between INITIAL and final position and here both are same so, displacement is zero.

Explanation:

Discussion

2.	1. A spherical mass of 20 kg lying on the surface ofthe earth is attracted by another spherical mass of150 kg with a force equal to the weight of 0.25 mg.The centres of the two masses are 30 cm apart.Calculate the mass of the earth. Radius of the earth= 6 x 10^6m.
Answer» Answer: $5.289 \times {10}^{24} kg$ Explanation: Given: $m_{1} = 20 \: kg \\ \\ m_2 = 150 \: kg \\ \\$ F = 0.25 mg $= 0.25 \times {10}^{ - 6} \\ (1mg \: = {10}^{ - 6} kg)$ R = 30 cm F = m×G $= \frac{30}{100} \: m \\ \\ = {10}^{ - 1} m$ We know that, $F \: = \: \frac{G. m_1 .m_2 }{ {r}^{2} } \\ \\ G = \frac{f {r}^{2} }{ m_1 . m_2 } \\ \\ = \frac{0.25 \times {10}^{ - 6} \times 9.8 \times {10}^{ - 1} \times {10}^{ - 1} }{20 \times 150} \\ \\ G = 6.67 \times {10}^{ - 11} N. {m}^{2} .kg {}^{ - 2}$ Now , by USING the formula of g (acceleration due to gravity) $g \: = \frac{GM}{ {R}^{2} } \\$ Where G = Gravitational constant, M = MASS of the earth R = radius of the earth. Here , we know the value of "g'' on the earth, i.e.9.8 m/s ². $9.8 = \frac{6.67 \times {10}^{ - 11} \times M }{(6 \times {10}^{6}) {}^{2} } \\ \\ 9.8 = \frac{6.67 \times {10 }^{ - 11} \times M}{36 \times {10}^{12} } \\ \\ 9.8 \times 36 \times {10}^{12} \: = 6.67 \times {10}^{ - 11} \times M \\ \\ \frac{9.8 \times 36 \times {10}^{12} }{6.67 \times {10}^{ - 11} } = M \\ \\ M \: = 5.289 \times {10}^{24} kg$ .

2.

1. A spherical mass of 20 kg lying on the surface ofthe earth is attracted by another spherical mass of150 kg with a force equal to the weight of 0.25 mg.The centres of the two masses are 30 cm apart.Calculate the mass of the earth. Radius of the earth= 6 x 10^6m.

Answer»

Answer:

$5.289 \times {10}^{24} kg$

Explanation:

Given:

$m_{1} = 20 \: kg \\ \\ m_2 = 150 \: kg \\ \\$

F = 0.25 mg

$= 0.25 \times {10}^{ - 6} \\ (1mg \: = {10}^{ - 6} kg)$

R = 30 cm

F = m×G

$= \frac{30}{100} \: m \\ \\ = {10}^{ - 1} m$

We know that,

$F \: = \: \frac{G. m_1 .m_2 }{ {r}^{2} } \\ \\ G = \frac{f {r}^{2} }{ m_1 . m_2 } \\ \\ = \frac{0.25 \times {10}^{ - 6} \times 9.8 \times {10}^{ - 1} \times {10}^{ - 1} }{20 \times 150} \\ \\ G = 6.67 \times {10}^{ - 11} N. {m}^{2} .kg {}^{ - 2}$

Now , by USING the formula of g (acceleration due to gravity)

$g \: = \frac{GM}{ {R}^{2} } \\$

Where G = Gravitational constant,

M = MASS of the earth

R = radius of the earth.

Here , we know the value of "g'' on the earth, i.e.9.8 m/s ².

$9.8 = \frac{6.67 \times {10}^{ - 11} \times M }{(6 \times {10}^{6}) {}^{2} } \\ \\ 9.8 = \frac{6.67 \times {10 }^{ - 11} \times M}{36 \times {10}^{12} } \\ \\ 9.8 \times 36 \times {10}^{12} \: = 6.67 \times {10}^{ - 11} \times M \\ \\ \frac{9.8 \times 36 \times {10}^{12} }{6.67 \times {10}^{ - 11} } = M \\ \\ M \: = 5.289 \times {10}^{24} kg$ .

Discussion

3.	(21) A body moving with uniform acceleration is havingvelocity 2 m/s and 8 m/s at t = 1 s and t = 4 s.respectively. Then average velocity of particle in thetime interval t = 1 ş to t = 4 s, is(1) 2 m/s(2) 3 m/s(3) 5/3 m/s(4) 5 m/s
Answer» ANSWER: 5m/s hope it WOULD be CORRECT

3.

(21) A body moving with uniform acceleration is havingvelocity 2 m/s and 8 m/s at t = 1 s and t = 4 s.respectively. Then average velocity of particle in thetime interval t = 1 ş to t = 4 s, is(1) 2 m/s(2) 3 m/s(3) 5/3 m/s(4) 5 m/s

Answer»

ANSWER:

5m/s

hope it WOULD be CORRECT

Discussion

4.	15. The spatial distribution of the electric field dueto two charges (A,B) is shown in the figure.Which one of the following statements is correct?(a) A is +ve and B-ve and\|A \|BL\|(b) Ais -ve and B+ve and\|A\|=\| B\|(c) Both are + ve but A B(d) Both are -ve but ABLAINS 2006
Answer» ANSWER: No clarity.Where is the FIGURE of QUESTION

4.

15. The spatial distribution of the electric field dueto two charges (A,B) is shown in the figure.Which one of the following statements is correct?(a) A is +ve and B-ve and|A |BL|(b) Ais -ve and B+ve and|A|=| B|(c) Both are + ve but A B(d) Both are -ve but ABLAINS 2006

Answer»

ANSWER:

No clarity.Where is the FIGURE of QUESTION

Discussion

5.	Please give us practice papers of science and technology for practice!!!
Answer» ANSWER: why nambshsmVzhs in svajmavahsmddhdjdd

5.

Please give us practice papers of science and technology for practice!!!

Answer»

ANSWER:

why nambshsmVzhs in svajmavahsmddhdjdd

Discussion

6.	Define susceptibility of a magnet.write the units?
Answer» In electromagnetism, the magnetic susceptibility is a measure of how much a material will become magnetized in an applied magnetic field. MATHEMATICALLY, it is the RATIO of magnetization M (magnetic moment per UNIT volume) to the applied magnetizing field intensity H.

6.

Define susceptibility of a magnet.write the units?

Answer»

In electromagnetism, the magnetic susceptibility is a measure of how much a material will become magnetized in an applied magnetic field.

MATHEMATICALLY, it is the RATIO of magnetization M (magnetic moment per UNIT volume) to the applied magnetizing field intensity H.

Discussion

7.	What is the difference between coloured light obtained from prism and soap bubble ?
Answer» The colours of a soap are seen due to INTERFERENCE of LIGHT. In the prism, colours APPEAR due to dispersion of light.

Discussion

8.	STof radius a is chargedunit length is 2. TheCD*. A semi-circular arc of radius a isuniformly and the charge per unit length is aelectric field at the centre is-
Answer» ANSWER: here r=2 g=10 ef=g/r =10/2=5 BEHAVE your answer MEET. I THINK this is HELPFUL.

8.

STof radius a is chargedunit length is 2. TheCD*. A semi-circular arc of radius a isuniformly and the charge per unit length is aelectric field at the centre is-

Answer»

ANSWER:

here r=2

g=10 ef=g/r =10/2=5 BEHAVE your answer MEET. I THINK this is HELPFUL.

Discussion

9.	Find the odd one out:Reflection, neutralization, refraction, dispersion
Answer» Answer: THE ODD ONE OUT IS NEUTRALISATION. .. Explanation: HOPE IT HELPS YOU MATE ....

9.

Find the odd one out:Reflection, neutralization, refraction, dispersion

Answer»

Answer:

THE ODD ONE OUT IS NEUTRALISATION. ..

Explanation:

HOPE IT HELPS YOU MATE

....

Discussion

10.	Function of the lower fixed point
Answer» Answer: ʟᴏᴡᴇʀ ғɪxᴇᴅ ᴘᴏɪɴᴛ ❤️ The lower fixed point, or ICE point, is the temperature of pure melting ice at NORMAL atmospheric pressure. ❤️ The lower fixed point determines the temperature at which the fluid used in the thermometer has the least (MINIMUM) volume. _________________________

10.

Function of the lower fixed point

Answer»

Answer:

ʟᴏᴡᴇʀ ғɪxᴇᴅ ᴘᴏɪɴᴛ

❤️ The lower fixed point, or ICE point, is the temperature of pure melting ice at NORMAL atmospheric pressure.

❤️ The lower fixed point determines the temperature at which the fluid used in the thermometer has the least (MINIMUM) volume.

_________________________

Discussion

11.	What is the S I unit of power of lens ?
Answer» ANSWER: A dioptre (British spelling) or diopter (AMERICAN spelling) is a unit of MEASUREMENT of the optical power of a lens or curved mirror, which is EQUAL to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.

11.

What is the S I unit of power of lens ?

Answer»

ANSWER:

A dioptre (British spelling) or diopter (AMERICAN spelling) is a unit of MEASUREMENT of the optical power of a lens or curved mirror, which is EQUAL to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.

Discussion

12.	Explain the principle of operation of optical fibre
Answer» Answer: The working principle of optical fiber is the transmission of the information in the form of light ATOMS otherwise photons. The cores of the fiberglass & the CLADDING have a special refractive index to twist INWARD light at a particular ANGLE. ... These two are made with different TYPES of plastic otherwise glass.

12.

Explain the principle of operation of optical fibre

Answer»

Answer:

The working principle of optical fiber is the transmission of the information in the form of light ATOMS otherwise photons. The cores of the fiberglass & the CLADDING have a special refractive index to twist INWARD light at a particular ANGLE. ... These two are made with different TYPES of plastic otherwise glass.

Discussion

13.	Which option is correctThe accelerations of a particle as seen from two frames S1 and S2 have equal magnitude 4 m/s2.(a) The frames must be at rest with respect to each other.(b) The frames may be moving with respect to each other.(c) The acceleration of S2 with respect to S1 may either be zero of 8 m/s2.(d) The acceleration of S2 with respect to S1 may be anything between zero and 8 m/s2.
Answer» ANSWER: option d in h. c varma because they MUST be at REST or less than 8 acceleration

13.

Which option is correctThe accelerations of a particle as seen from two frames S1 and S2 have equal magnitude 4 m/s2.(a) The frames must be at rest with respect to each other.(b) The frames may be moving with respect to each other.(c) The acceleration of S2 with respect to S1 may either be zero of 8 m/s2.(d) The acceleration of S2 with respect to S1 may be anything between zero and 8 m/s2.

Answer»

ANSWER:

option d in h. c varma because they MUST be at REST or less than 8 acceleration

Discussion

14.	Name any two device that converts electrical energy into heat energy
Answer» ANSWER: the two devices are ELECTRICAL heater and electricity oven electric IORN electric bulbs filaments of halogen bulbs hope this will help you and PLEASE mark me as BRAINLEST and follow me

14.

Name any two device that converts electrical energy into heat energy

Answer»

ANSWER:

the two devices are

ELECTRICAL heater and electricity oven

electric IORN

electric bulbs filaments of halogen bulbs

hope this will help you and PLEASE mark me as BRAINLEST and follow me

Discussion

15.	What is the difference between moisture and percolation
Answer» ANSWER: moisture STARTS with the letter WHEREAS percolation starts with letter p.please t give thanks for my hardwork

15.

What is the difference between moisture and percolation

Answer»

ANSWER:

moisture STARTS with the letter WHEREAS percolation starts with letter p.please t

give thanks for my hardwork

Discussion

16.	If momentum of an object is increased by 10%then it's ke will increase by
Answer» Answer: ke will increase by 21% Explanation: momentum is product of MASS and VELOCITY =mv Kinetic energy = 1/2 mv^2 = 1/2 momentum^2/m assume mass is constant now ke = a.momentum^2 (.5/m taken as CONTANT a) now momentum increased as 1.1 mv ke will increase as square of 1.1 i.e. ke will increase as 1.21ke that is by 21%

16.

If momentum of an object is increased by 10%then it's ke will increase by

Answer»

Answer:

ke will increase by 21%

Explanation:

momentum is product of MASS and VELOCITY =mv

Kinetic energy = 1/2 mv^2

= 1/2 momentum^2/m

assume mass is constant

now

ke = a.momentum^2 (.5/m taken as CONTANT a)

now momentum increased as 1.1 mv

ke will increase as square of 1.1

i.e. ke will increase as 1.21ke that is by 21%

Discussion

17.	What is the balence equation of Co2+cahco3- salt + water
Answer» Answer: 4Cahco3+2Co2--4Caco3+2Co2+2H2O

17.

What is the balence equation of Co2+cahco3- salt + water

Answer»

Answer:

4Cahco3+2Co2--4Caco3+2Co2+2H2O

Discussion

18.	Ice /water is the substance that _________(a expands on melting and contracts on freezingb Contracts on melting and does not undergo change in volume on freezing C contracts on melting and expands on freezing
Answer» ANSWER: Option C Explanation: WATER expands on freezing and contracts on MELTING

18.

Ice /water is the substance that _________(a expands on melting and contracts on freezingb Contracts on melting and does not undergo change in volume on freezing C contracts on melting and expands on freezing

Answer»

ANSWER:

Option C

Explanation:

WATER expands on freezing and contracts on MELTING

Discussion

19.	What is the reason for induction of current by the motion 0f magnet and a coil of conductor
Answer» Answer: Electromagnetic induction is a phenomenon in which a changing magnetic FIELD across a loop of wire results in the generation of an induced emf. When there is relative motion between a MAGNET and the coil, magnetic FLUX changes and HENCE an ELECTROMOTIVE force is generated in the coil.

19.

What is the reason for induction of current by the motion 0f magnet and a coil of conductor

Answer»

Answer:

Electromagnetic induction is a phenomenon in which a changing magnetic FIELD across a loop of wire results in the generation of an induced emf. When there is relative motion between a MAGNET and the coil, magnetic FLUX changes and HENCE an ELECTROMOTIVE force is generated in the coil.

Discussion

20.	19.A wire is bent in the form of circle of radius 2m. Resistanceper unit length of wire is 1/1 12/m. Battery of 6V isconnected between A & B. AOB = 90°. Find the currentthrough the battery[GUJCET 2014]Oo...B(a) 8A(b) 4A(c) 3A(d) 9A6 V
Answer» ANSWER: A is right answer please MAKE me Brainlist have a Nice DAY

20.

19.A wire is bent in the form of circle of radius 2m. Resistanceper unit length of wire is 1/1 12/m. Battery of 6V isconnected between A & B. AOB = 90°. Find the currentthrough the battery[GUJCET 2014]Oo...B(a) 8A(b) 4A(c) 3A(d) 9A6 V

Answer»

ANSWER:

A is right answer

please MAKE me Brainlist

have a Nice DAY

Discussion

21.	Body A of mass 3 kg and body B of mass 10 kg are dropped simultaneously from a height of 14.9 m . Calculate their momenta , potential energies and kinetic energies when they are 10 m above the ground
Answer» EXPLANATION: now, P.E(a)=mgh=3×9.8×10=29.4J P.E(B)=10×9.8×10=980J

21.

Body A of mass 3 kg and body B of mass 10 kg are dropped simultaneously from a height of 14.9 m . Calculate their momenta , potential energies and kinetic energies when they are 10 m above the ground

Answer»

EXPLANATION:

now, P.E(a)=mgh=3×9.8×10=29.4J

P.E(B)=10×9.8×10=980J

Discussion

22.	What is electromagnetic induction
Answer» $\color{blue}{solution}$ ANSWER=Electromagnetic *INDUCTION* is *the* *production* of *VOLTAGE* or *electromotive* *force* *due* to a *CHANGE* in *the* *MAGNETIC* *field*

Discussion

23.	coefficient of mutual inductance of two coils is 1H. current in one of the coils is increased ftom 4-5in 1ms. what is the average emf
Answer» ANSWER: 1000 is the CORRECT answers Explanation: EMF = L di/dt hope the answer will help you

23.

coefficient of mutual inductance of two coils is 1H. current in one of the coils is increased ftom 4-5in 1ms. what is the average emf

Answer»

ANSWER:

1000 is the CORRECT answers

Explanation:

EMF = L di/dt

hope the answer will help you

Discussion

24.	How does the capacitance change if distance b/w plate is halfeda doesn't changeb become halfc doubledd become one fourth
Answer» Answer: C= AE/d where E= permittivity of the MEDIUM, d= distance b/w PLATES

24.

How does the capacitance change if distance b/w plate is halfeda doesn't changeb become halfc doubledd become one fourth

Answer»

Answer:

C= AE/d where E= permittivity of the MEDIUM, d= distance b/w PLATES

Discussion

25.	two car p and Q start from a point at the same time in a straight line and their positions are represented by
Answer» Answer: d) is CORRECT answer Explanation: FUNCTION of POSITION is given differentiate both the expression wrt time to OBTAIN expression for their velocities V1= a + 2bt V2 = f-2t let at time t both cars have same velocity a+2bt = f-2t a-f= t(-2-2b) t= (f-a)/2+2b

25.

two car p and Q start from a point at the same time in a straight line and their positions are represented by

Answer»

Answer:

d) is CORRECT answer

Explanation:

FUNCTION of POSITION is given

differentiate both the expression wrt time to OBTAIN expression for their velocities

V1= a + 2bt

V2 = f-2t

let at time t both cars have same velocity

a+2bt = f-2t

a-f= t(-2-2b)

t= (f-a)/2+2b

Discussion

26.	Explain the construction of an electric bell
Answer» Answer: The construction of an electric bell consists of a GONG, an electromagnet, a soft iron ROD and a CONTACT screw. The working of an electric bell: When the current passes through the electromagnet, it BECOMES magnetized which helps to attract the armature and after this the hammer raids and attract the armeture. mark it as BRAINLIEST ANSWER PLZZZZ

26.

Explain the construction of an electric bell

Answer»

Answer:

The construction of an electric bell consists of a GONG, an electromagnet, a soft iron ROD and a CONTACT screw. The working of an electric bell: When the current passes through the electromagnet, it BECOMES magnetized which helps to attract the armature and after this the hammer raids and attract the armeture.

mark it as BRAINLIEST ANSWER PLZZZZ

Discussion

27.	Using dimensional analysis check equation v u+at is dimensionally correct or not ( symbol in eqation has usual meaning )
Answer» Answer: see in the IMAGE if it HELPS you please MARK as brainlest answer

27.

Using dimensional analysis check equation v u+at is dimensionally correct or not ( symbol in eqation has usual meaning )

Answer»

Answer:

see in the IMAGE if it HELPS you please MARK as brainlest answer

Discussion

28.	Huygens theory of double refraction
Answer» Huygens' principle, in optics, a statement that all points of a wave front of light in a vacuum or transparent medium may be regarded as NEW sources of wavelets that expand in every direction at a rate DEPENDING on their VELOCITIES.

28.

Huygens theory of double refraction

Answer»

Huygens' principle, in optics, a statement that all points of a wave front of light in a vacuum or transparent medium may be regarded as NEW sources of wavelets that expand in every direction at a rate DEPENDING on their VELOCITIES.

Discussion

29.	Kindly ans the following questions
Answer» ANSWER: Q2)ans-3 Hope U like it.... if it is WRONG then REPLY me. okkkkk

29.

Kindly ans the following questions

Answer»

ANSWER:

Q2)ans-3

Hope U like it....

if it is WRONG then REPLY me.

okkkkk

Discussion

30.	Properties of magnetic field
Answer» Answer: they are PARALLEL to each other they do not intersect tangent at any point on the magnetic field LINE tell the DIRECTION of the magnetic field line at that point Explanation: MARK AS BRAINLIEST

30.

Properties of magnetic field

Answer»

Answer:

they are PARALLEL to each other

they do not intersect

tangent at any point on the magnetic field LINE tell the DIRECTION of the magnetic field line at that point

Explanation:

MARK AS BRAINLIEST

Discussion

31.	Explain how nuclear fusion in the Sun produces the sunlight we see on Earth.
Answer» Answer: The vast amount of hydrogen atoms in the sun CORE are compressed and heated so much that they FUSE together . This is CALLED nuclear fusion,convert hydrogen ATOM into helium..

31.

Explain how nuclear fusion in the Sun produces the sunlight we see on Earth.

Answer»

Answer:

The vast amount of hydrogen atoms in the sun CORE are compressed and heated so much that they FUSE together . This is CALLED nuclear fusion,convert hydrogen ATOM into helium..

Discussion

32.	9. Definition - Power of accommodation, Elect10. Difference between Voltmeter & Ammeter.11 Richt hand thumble
Answer» $\huge\star{\green{\underline{\mathfrak{Answer :-}}}}$ Question 1: What is Power of Accommodation? AnsWeR: Power of accommodation is the ability of our eye to change the FOCAL length of the eye crystalline lens. Due to this, the eye lens is able to SEE objects both from our eye and near to our eye. $\<klux>RULE</klux>{200}2$ Question 2: Differentiate between Voltmeter and Ammeter. AnsWeR: $\boxed{\begin{tabular}{c\|c}\bf Voltmeter & \bf Ammeter\\\cline{1-2}Use to measure the voltage in the circuit &Use to measure the current in a circuit.\\\cline{1-2}Represented as an encircled V. & Represented as an encircled A.\\\cline{1-2}Voltmeter is always connected in parallel. & Ammeter is always connected in series.\end{tabular}}$ $\rule{200}2$ Question 3: What is right hand thumb rule ? AnsWeR: It states that when the thumb is stretched out in the right hand towards the direction of the current in a straight current carrying conductor, the curly fingers represent the direction of magnetic FED. It is used to find out the direction of magnetic FIELD. $\rule{200}2$ $\rule{200}4$

32.

9. Definition - Power of accommodation, Elect10. Difference between Voltmeter & Ammeter.11 Richt hand thumble

Answer»

$\huge\star{\green{\underline{\mathfrak{Answer :-}}}}$

Question 1: What is Power of Accommodation?

AnsWeR: Power of accommodation is the ability of our eye to change the FOCAL length of the eye crystalline lens. Due to this, the eye lens is able to SEE objects both from our eye and near to our eye.

$\<klux>RULE</klux>{200}2$

Question 2: Differentiate between Voltmeter and Ammeter.

AnsWeR:

$\boxed{\begin{tabular}{c|c}\bf Voltmeter & \bf Ammeter\\\cline{1-2}Use to measure the voltage in the circuit &Use to measure the current in a circuit.\\\cline{1-2}Represented as an encircled V. & Represented as an encircled A.\\\cline{1-2}Voltmeter is always connected in parallel. & Ammeter is always connected in series.\end{tabular}}$

$\rule{200}2$

Question 3: What is right hand thumb rule ?

AnsWeR: It states that when the thumb is stretched out in the right hand towards the direction of the current in a straight current carrying conductor, the curly fingers represent the direction of magnetic FED. It is used to find out the direction of magnetic FIELD.

$\rule{200}2$

$\rule{200}4$

Discussion

33.	A body of mass 20 kg moving with a speed of 10 ms -1 on a horizontal smooth surfacecollides with a massless spring of spring constant 5 N/m. If the mass stops aftercollision, distance of compression of the spring will be :(a)10 m(b)50 m(c)5 m(d)20 m
Answer» ANSWER:d 20 Explanation Law of MECHANICAL ENERGY conservation 1/2mv^2=1/2kx^2 20X 100/2=1/2X 5X x^2 x=20

33.

A body of mass 20 kg moving with a speed of 10 ms -1 on a horizontal smooth surfacecollides with a massless spring of spring constant 5 N/m. If the mass stops aftercollision, distance of compression of the spring will be :(a)10 m(b)50 m(c)5 m(d)20 m

Answer»

ANSWER:d 20

Explanation

Law of MECHANICAL ENERGY conservation

1/2mv^2=1/2kx^2

20X 100/2=1/2X 5X x^2

x=20

Discussion

34.	8. Conservation of fossil fuels.Definition - Power of accommodation Electric Power, Electric Potential.0 Difference between Voltmeter & Ammeter
Answer» ANSWER: idk Explanation: SORRY i DUNNO

34.

8. Conservation of fossil fuels.Definition - Power of accommodation Electric Power, Electric Potential.0 Difference between Voltmeter & Ammeter

Answer»

ANSWER:

idk

Explanation:

SORRY i DUNNO

Discussion

35.	Angle of deviation the symbol is called
Answer» ANSWER: lemda is SYMBOL of ANGLE of DEVIATION

35.

Angle of deviation the symbol is called

Answer»

ANSWER:

lemda is SYMBOL of ANGLE of DEVIATION

Discussion

36.	(13) A swimmer at point A on one side of river wants toreach at a point B on the other side by swimming only.Line AB makes angle 30° with the river flow. Velocityof swimmer is equal to velocity of river flow in magni-tude. In what direction o with the line AB should hetry to swim to reach at B.1
Answer» Answer: theta= 30 degrees Explanation: tan alpha= A sin theta / B + A sin theta Now, tan 30 = Vsr sin theta/ VR + Vsr cos theta 1/root(3) = Vsr sin theta/ Vsr+ Vsr cos theta ( Vsr= Vr) 1/root 3 = sin theta/ 1+ cos theta Tan theta/2 = tan 30 Theta = 60 degree BETA= 60-30 = 30

36.

(13) A swimmer at point A on one side of river wants toreach at a point B on the other side by swimming only.Line AB makes angle 30° with the river flow. Velocityof swimmer is equal to velocity of river flow in magni-tude. In what direction o with the line AB should hetry to swim to reach at B.1

Answer»

Answer: theta= 30 degrees

Explanation: tan alpha=

A sin theta / B + A sin theta

Now, tan 30 =

Vsr sin theta/ VR + Vsr cos theta

1/root(3) = Vsr sin theta/ Vsr+ Vsr cos theta ( Vsr= Vr)

1/root 3 = sin theta/ 1+ cos theta

Tan theta/2 = tan 30

Theta = 60 degree

BETA= 60-30 = 30

Discussion

37.	14. To a person, going eastward in a car with a velocity of 25 km/hr, a train appears to movetowards north with a velocity of 25.13 km/hr. The actual velocity of the train will be(a) 25 km/hr (b) 50 km/hr (c) 5 km/hr (d) 513 km/hr
Answer» ANSWER: OPTION (a) 25 KM / hr hope it RIGHT

37.

14. To a person, going eastward in a car with a velocity of 25 km/hr, a train appears to movetowards north with a velocity of 25.13 km/hr. The actual velocity of the train will be(a) 25 km/hr (b) 50 km/hr (c) 5 km/hr (d) 513 km/hr

Answer»

ANSWER:

OPTION (a) 25 KM / hr

hope it RIGHT

Discussion

38.	Kulam किस चीज का मात्रक है
Answer» EXPLANATION: CHARGE unit he coulomb SPELLING mistake he BRO

38.

Kulam किस चीज का मात्रक है

Answer»

EXPLANATION:

CHARGE unit he coulomb

SPELLING mistake he BRO

Discussion

39.	An element with atomic number 11 and another atomic number 17 react with each other and form a compound assign the element to its respective group period and block in the modern periodic table by writing is electronic cofiguration?
Answer» ANSWER: sodium 11 and CHLORINE 17 Explanation: the COMPOUND is NaCl sodium - 1S2 2s2 2p6 3 s1 block- s period-3 group- 1 chlorine - 1s2 2s2 2p6 3s2 3 p5 block- p period- 3 group- 17

39.

An element with atomic number 11 and another atomic number 17 react with each other and form a compound assign the element to its respective group period and block in the modern periodic table by writing is electronic cofiguration?

Answer»

ANSWER:

sodium 11 and CHLORINE 17

Explanation:

the COMPOUND is NaCl

sodium - 1S2 2s2 2p6 3 s1

block- s

period-3

group- 1

chlorine - 1s2 2s2 2p6 3s2 3 p5

block- p

period- 3

group- 17

Discussion

40.	If we gradually increase the angle of incidence of light passing through prism,then__________.
Answer» $hey \: mate \: your \: answer \: is \: here$ If we gradually increase the angle of incidence of a ray of light PASSING through prism then ….. a) Angle of DEVIATION goes on decreasing. b) Angle of deviation DECREASES but after certain value of incident angle, deviation angle INCREASES c) Angle of deviation goes on increasing. d) Angle of deviation increases but after certain value of incident angle deviation angle decreases.

40.

If we gradually increase the angle of incidence of light passing through prism,then__________.

Answer»

$hey \: mate \: your \: answer \: is \: here$

If we gradually increase the angle of incidence of a ray of light PASSING through prism

then …..

a) Angle of DEVIATION goes on decreasing.

b) Angle of deviation DECREASES but after certain value of incident angle, deviation

angle INCREASES

c) Angle of deviation goes on increasing.

d) Angle of deviation increases but after certain value of incident angle deviation angle decreases.

Discussion

41.	There are two metallic wires of same thickness one of iron and silver. the length of the iron wire is 12cm .what should be the length of the silver wire which has a same resistance equal to the resistance of iron wire?Note-- resistance of iron =1.60×10 to the power-8. resistance of silver=10.0×10 to the power-8 plz friends help me!!!!!!!
Answer» ANSWER: PLEASE CHECK ur QUESTION something ERROR here....

41.

There are two metallic wires of same thickness one of iron and silver. the length of the iron wire is 12cm .what should be the length of the silver wire which has a same resistance equal to the resistance of iron wire?Note-- resistance of iron =1.60×10 to the power-8. resistance of silver=10.0×10 to the power-8 plz friends help me!!!!!!!

Answer»

ANSWER:

PLEASE CHECK ur QUESTION something ERROR here....

Discussion

42.	Does pressure have dierction explain
Answer» Answer: PRESSURE is a scalar quantity, not a vector quantity. It has magnitude but no direction SENSE associated with it. Pressure force ACTS in all directions at a point INSIDE a gas. At the surface of a gas, the pressure force acts perpendicular (at right ANGLE) to the surface.

42.

Does pressure have dierction explain

Answer»

Answer:

PRESSURE is a scalar quantity, not a vector quantity. It has magnitude but no direction SENSE associated with it. Pressure force ACTS in all directions at a point INSIDE a gas. At the surface of a gas, the pressure force acts perpendicular (at right ANGLE) to the surface.

Discussion

43.	A vehicle starting from rest accelerates uniformly to a speed of 80km/hr in a time of 20s. Determine the acceleration and the distance traveled in this time
Answer» ANSWER: You NEED to be SURE to use consistent units, tho. Using 'a' for acceleration and 't' for time: Distance is Initial VELOCITY TIMES time + 1/2 at^2. Velocity Explanation:

43.

A vehicle starting from rest accelerates uniformly to a speed of 80km/hr in a time of 20s. Determine the acceleration and the distance traveled in this time

Answer»

ANSWER:

You NEED to be SURE to use consistent units, tho. Using 'a' for acceleration and 't' for time: Distance is Initial VELOCITY TIMES time + 1/2 at^2. Velocity

Explanation:

Discussion

44.	Solve ....Physics...
Answer» *here is your* *ans. in the* *above PIC* .. *HOPE* it *help*s. ☺☺☺☺☺

44.

Solve ....Physics...

Answer»

here is your ans.

in the above PIC ..

HOPE it helps.

☺☺☺☺☺

Discussion

45.	Show the sound cannot pass through a vacuum
Answer» Answer: Hey buddy here's UR answer SOUND cannot travel through a VACUUM. A vacuum is an area without any air, LIKE space. So sound cannot travel through space because there is no matter for the vibrations to WORK in.

45.

Show the sound cannot pass through a vacuum

Answer»

Answer:

Hey buddy here's UR answer

SOUND cannot travel through a VACUUM. A vacuum is an area without any air, LIKE space. So sound cannot travel through space because there is no matter for the vibrations to WORK in.

Discussion

46.	A net force F acts on a mass "m" and produces an acceleration "a". What acceleration results if a net force 2F acts on mass 4m?a) a/2b) 8ac) 4ad) 2a
Answer» Answer: a Explanation: SINCE product of MASS and acceleration is 2F and F equals ma , ACC= 2F/4M = 2MA/4M = A/2

46.

A net force F acts on a mass "m" and produces an acceleration "a". What acceleration results if a net force 2F acts on mass 4m?a) a/2b) 8ac) 4ad) 2a

Answer»

Answer:

a

Explanation:

SINCE product of MASS and acceleration is 2F and F equals ma , ACC= 2F/4M = 2MA/4M = A/2

Discussion

47.	How is ultrasound used for cleaning.
Answer» Answer: The objects to be CLEANSED are put in cleaning solution and ultrasonic sound waves are passed through that solution. The high frequency of these ultrasound waves detaches the DIRT from the objects and hence the objects are cleaned Explanation:Ultrasonic cleaning uses cavitation BUBBLES induced by high frequency pressure (sound) waves to agitate a liquid. The agitation produces high FORCES on contaminants adhering to substrates like metals, plastics, glass, rubber, and ceramics. This action ALSO penetrates blind holes, cracks, and recesses.

47.

How is ultrasound used for cleaning.

Answer»

Answer:

The objects to be CLEANSED are put in cleaning solution and ultrasonic sound waves are passed through that solution. The high frequency of these ultrasound waves detaches the DIRT from the objects and hence the objects are cleaned

Explanation:Ultrasonic cleaning uses cavitation BUBBLES induced by high frequency pressure (sound) waves to agitate a liquid. The agitation produces high FORCES on contaminants adhering to substrates like metals, plastics, glass, rubber, and ceramics. This action ALSO penetrates blind holes, cracks, and recesses.

Discussion

48.	A car is traveling at a constant speed of 55k/h on a circular track. Is the car accelerating, explain
Answer» Answer: Nope car is not ACCELERATING SINCE it's MENTIONED that car is having CONST."speed"not velocity

48.

A car is traveling at a constant speed of 55k/h on a circular track. Is the car accelerating, explain

Answer»

Answer:

Nope car is not ACCELERATING

SINCE it's MENTIONED that car is having CONST."speed"not velocity

Discussion

49.	Why 5N+4N does not always mean a resultant force of 9N?
Answer» Answer: DUE to PRINCIPLE of SUPER position Explanation: Fnet is the vector sum of two FORCES not scaler it'll range b/w 1N to 9N depending upon angel b/w them

49.

Why 5N+4N does not always mean a resultant force of 9N?

Answer»

Answer:

DUE to PRINCIPLE of SUPER position

Explanation:

Fnet is the vector sum of two FORCES not scaler

it'll range b/w 1N to 9N depending upon angel

b/w them

Discussion

50.	एम्पियर क्या नापने की इकाई है ?
Answer» ANSWER: akankshap8388 my SNAP ID

50.

एम्पियर क्या नापने की इकाई है ?

Answer»

ANSWER:

akankshap8388 my SNAP ID

Discussion

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Kulam किस चीज का मात्रक है

Does pressure have dierction explain

Solve ....Physics...

How is ultrasound used for cleaning.

एम्पियर क्या नापने की इकाई है ?