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Indian Certificate of Secondary Education (ICSE), New Delhi
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asked by Hema Bonaboyina (hemab) 3 mins ago
0

+ 1 more questions by hemab  

http://www.respaper.com/vivekgupta98/5325-pdf.html how do you solve 3.d?
asked by Ted Green (tedgreen) 1 hour ago
2

+ 5 more questions by tedgreen  

Can anyone  say me what happens  if a radioactive  substance is oxidised
asked by Rashmi Rokhade (rashmir) 2 hours ago
2
pg 164 question 27(IN CONCISE)
Hey,  in that question why are they sayin that since the length of air column in B is 3 times that of D therefore resonance is taking place because A and C are 4 and 2 times that of D?
asked by Shivaanee sharma (shivaanee22) 2 hours ago
2

+ 7 more questions by shivaanee22  

For the heating curve of water, do we also draw the part after vaporisation?
asked by 10G (2016_10g) 3 hours ago
2

+ 1 more questions by 2016_10g  

What is pole fuse?
asked by Debargha Chowdhury (debachow) 5 hours ago
1
Are these symbols accepted by boards for a lens? (Kindly see the comment section)
asked by Prerak Modia (preee) 5 hours ago
1

+ 2 more questions by preee  

Alright please answer this A.C travel with a frequency of 50Hz .It means the polarity changes 100 times in 1 sec or 50 times.
asked by Funny Funny (funnysimgh) 5 hours ago
2

+ 1 more questions by funnysimgh  

Explain subsidiary notes pls....and how they help determine quality of sound
asked by Xyz (san_ika) 6 hours ago
0
http://www.respaper.com/ved0_ssk_respaper_pongala/9854-pdf.html Q5 a1 pls show the working
asked by Disha Ghatak (disha95) 6 hours ago
2
all the best and hope we live to see another day
asked by Souhardya Casillas (yendache) 6 hours ago
1
A fish can see everything over water layer in just 96 degrees only?Explain
asked by 45Trolaf (olaf) 6 hours ago
1

+ 3 more questions by olaf  

What is the difference between sound level and loudness and Intensity?
asked by Anurag Hooda (akhooda) 7 hours ago
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+ 5 more questions by akhooda  

why is voltmeter always connected in parallel and ammeter in series plz help
asked by Manav Mehta (manavm16) 7 hours ago
1

+ 2 more questions by manavm16  

Someone verify this please (this is very much in the syllabus )
Background radiations can be detected by Geiger counter and its rate constant at a given place.First record the background radiation by Geiger counter. Let count rate be n .Now, count the emission rate from the given radioactive source . Let the count rate be N
Therefore, True rate of emission = N - n
asked by Anurag (anurag45) 7 hours ago
4

+ 1 more questions by anurag45  

A man climbs a slope and another walks the same distance on a level road. Which of them spends more energy and why?
asked by Anurag Purohit (anurag2001) 7 hours ago
3

+ 1 more questions by anurag2001  

All the best friends!!!
asked by Lonesome Loser (fool) 7 hours ago
2

+ 4 more questions by fool  

Electromag waves to detect fake currency?(Bik gai hai gormint)
And how to detect background radiations
asked by ­ (heisenberg69) 7 hours ago
1

+ 1 more questions by heisenberg69  

what is the relationship b/w the angle of incidence and refraction at min deviation position of the prism
asked by Papu Papu (loosu) 8 hours ago
2

+ 1 more questions by loosu  

Hi guyzzz. 
I would lyk to suggest you to read the board papers for physics of the following years: 2016,2014,2011.
I hv heard from someone that these papers are very important.
asked by Amandeep Kaur Chawla (princessapril) 8 hours ago
2
What is length of CERN tunnel in Geneva,Switzerland
asked by PHYSICIST_Mainak (mainak_leo) 8 hours ago
6
How does resistance depend on the area of cross section of a conductor?
asked by Ansh Thamke (ansh_cr7) 9 hours ago
3

+ 1 more questions by ansh_cr7  

http://www.respaper.com/harshavvardhan/774/6557-zip.html q7 -c with answers reasons please
asked by Armk (sushilamod) 9 hours ago
0

+ 3 more questions by sushilamod  

Is osterd's law there in syllabus?
If yes then please explain in short.
asked by Peeyush Mishra (it_is_peeyush) 9 hours ago
2
explain "critical angle of diamond is 24"
asked by Siddharth dubey (siddharth33) 9 hours ago
4
WORKING OF THE CRT
Loads of people have trouble understanding this so I thought I'd help make it a little simpler :] 

1) Filament heats the Cathode. 
2) Cathode gets charged and emits the electrons
3) Grid(situated between Anode and Cathode) directs the entry of electrons
4) Anode provides Kinetic energy to the electrons
5) Deflecting plates direct the electrons to the flourascent screen. 

This is the process of how an electrical signal is converted into a visual signal. Please correct me if I made any mistake. 
Hope I helped :]
asked by Delta Vortex (legofigure11) 9 hours ago
3
Suresh applies a force of 6kgf to draw a 4.8kg bucket of water from a well using a single fixed pulley. Assuming all extra force is used to overcome frictional forces, calculate MA, VR, eff.
ans should be 0.8 MA, VR is 1 and eff. 80% right?
asked by Nishant Shah (nishantshahroxx) 9 hours ago
4
what is the exact meaning of power rating ?
asked by Mickey (sanyasrivastava) 9 hours ago
1
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power which the pump supplies. [Take g = 10 Nkg-1 and density of water = 1000kgm-1]

PLEASE SOLVE THIS
asked by Adit Agrawal (aditagra) 10 hours ago
1
Hey , a bulb is rated 100w , 250v . what does it convey?
and ,,, The critical angle of glass is 42 degrees
ASAP, Thank you in advance :)
asked by Navneeth (poopstar) 10 hours ago
3

+ 1 more questions by poopstar  

Question in response cud someone answer this along with the simplified diagram?
asked by Akash Ashok (akashskyash007) 10 hours ago
4
For diagram based question, if there r different sub questions for d same diagram, do we have to draw separate diagrams or can we jst make a single diagram??
asked by Deblina Bora (booksboozer) 10 hours ago
1
PHYSICS DEFINITIONS!!

Measurements

Scalar quantities are quantities in which the magnitude is stated, but the direction is either not applicable or not specified.

Vector quantities are quantities in which both the magnitude and the direction must be stated.

 
Kinematics

Distance travelled by an object is the length of path taken.

Displacement is the shortest distance from the initial to the final position of an object.

Speed is the distance moved per unit time.

Velocity (v) of an object is the rate of change of displacement with respect to time.

Acceleration of an object is the rate of change of velocity with respect to time.

 
Forces and Turning effect of Force

Newton’s First Law states that an object will continue in its state of rest or uniform motion in a straight line as long as there is no net force acting on the body.

Newton’s Second Law states that when a resultant force acts on an object of a constant mass, the object will accelerate in the direction of the resultant force.

Newton’s Third Law states that if object A exerts a force on object B, then object B will also exert an equal and opposite force on object A

The moment of a force (torque) is defined as the turning effect of the force about a pivot and is the product of the force and the perpendicular distance from the line of action of the force to the pivot.

The centre of mass of a body of matter is an imaginary point at which the entire mass of the body seems to act.

The centre of gravity of a body of matter is an imaginary point at which the entire weight of the body seems to act.

 
Mass, Weight and Density

Mass is defined as the amount of matter in an object

Weight is defined as the gravitational force acting on an object

Inertia is defined as the reluctance on an object to change its state of rest or motion, due to its mass.

A Gravitational Field is a region in which a mass experiences a force due to gravitational attraction

Gravitational Field Strength is defined as the gravitational force acting per unit mass .

Density (ρ

) is defined as the mass of a substance per unit volume.

Terminal velocity is the highest velocity attainable by an object in free fall.

 
Pressure 

Pressure is defined as the perpendicular force acting on unit area of a surface or the force per unit area.

Boyle’s Law states that the volume of a fixed mass of gas at constant temperature is inversely proportional to the pressure applied to the gas.

 
Work, Energy and Power

The Principle of conservation of energy states that energy cannot be created nor destroyed but can be converted from one form to another and the total amount of energy of a enclosed system remains constant.

Kinetic Energy, Ek

is the energy a body possesses by virtue of its motion.

Gravitational Potential Energy is defined as the amount of work done in order to raise the body to the height h  from a reference level.

Power is defined as the rate of work done OR;

Power is defined as the rate of energy converted with respect to time.

 
Thermal Physics

Melting is the process in which energy absorbed by a substance results in a change of state from solid to liquid, without a change in temperature.

Solidification is the process in which energy taken away from a substance results in a change of state from liquid to solid, without a change in temperature.

Boiling is the process in which the energy absorbed by a substance changes it from liquid state to gaseous state, without a change in temperature.

Condensation is the process in which energy taken away from substance changes it from gaseous state to liquid state, without a change in temperature.

Heat Capacity, C,of a body is defined as the amount of heat (Q) required to raise its temperature (θ) by one degree, without going through a change of state.

Specific heat capacity, c, of a body is defined as the amount of heat (Q) required to raise the temperature (θ) of a unit mass of it by one degree, without going through a change in state.

Specific latent heat of fusion of a substance is defined as the amount of heat required to change a unit mass of the substance from solid to liquid state, without any change in the temperature.

Specific latent heat of vapourization of a substance is defined as the amount of heat required to change unit mass of the substance from liquid state to gas state without a temperature change.

 

Conduction is the transfer of thermal energy from one place to another without any flow of the medium.

Convection is the transfer of thermal energy from one place to another by means of convection currents in a fluid (gas or liquid), due to a difference in density

Radiation is the transfer of thermal energy from one place to another by means of electromagnetic radiation, without the need of an intervening material medium.

 
Waves, Reflection and Refraction of light, Converging lens

Amplitude is the maximum displacement from the rest or central position, in either directions.

Frequency (f) is defined as the number of complete waves produced per unit time.

Wavelength (λ) is the distance between corresponding points of two consecutive waves.

Speed of the wave propagation is defined as the distance travelled by a wave per unit time.

Period (T) is defined as the time taken to produce one complete wave.

First law of reflection  states that the incident ray, the reflected ray and the normal to the surface all lie in the same plane.

Second law of reflection states that the angle of incidence is equal to the angle of reflection.

Refraction of light is the change in direction (bending of light rays) when it passes from one optically transparent medium to another.

First law of refraction states that the incident ray, the refracted ray and the normal to the interface all lie in the same plane.

Second law of refraction states that for two given media, the ratio sinisinr=constant
, where i is the angle of incidence and r

is the angle of refraction.

 
Electricity and D.C. Circuits

Electric Current is defined as the rate of flow of charges.

Electromotive Force (e.m.f) of a source is defined as the the work done by the source in driving a unit charge around a complete circuit.

Potential difference across a component is defined as the work done to drive a unit charge through the component.

Ohm’s law states that the current flowing through a metallic conductor is directly proportional to the potential difference across it, provided that the physical conditions remain constant.

 
Electromagnetic Force and Electromagnetic Induction

Faraday’s Law of Electromagnetic induction is the process in which an electromotive force (emf) is induced in a closed circuit due to changes in the magnetic field around the circuit.

Lenz’s law states that the direction of the induced e.m.f. and hence the induced current in a closed circuit is always such that it opposes the change in producing it.

 
Radioactivity and the nuclear atom

Isotopes are different atoms of an element which have the same number of protons, but a different number of neutrons from each other.

Radioactive decay refers to the process in which α-particles and β-particles are emitted by an unstable nuclei (contains too many neutrons or protons) of an element in order to form a more stable nuclei of another element.

The half-life of a sample of a radioactive isotope is defined as the time taken for half the original unstable radioactive nuclei to decay.
asked by Surya Kumar (surya30) 10 hours ago
4

+ 1 more questions by surya30  

http://www.respaper.com/sdfg/870-pdf.html Q.9B ans ....quick ASAP
asked by Mohammed Malik Sharaf (mmks1234) 10 hours ago
2

+ 5 more questions by mmks1234  

Why is it necessary to have an earth wire installed in a power circuit,but not in a ligthning circuit?
asked by Rishi (utkarsh3107) 10 hours ago
1

+ 1 more questions by utkarsh3107  

Do we have power of lens?
asked by Eliz (eliz1995) 11 hours ago
2
Two metal wires of same material and lengths have radii 1mm and 2mm.
Find the ratio of their resistances.
asked by SayWhatBbg (eleanor25) 11 hours ago
2
how to find weight of the ruler
asked by Preetham (preetham21) 11 hours ago
3

+ 1 more questions by preetham21  

The hammer of an electric strikes 1440 times in a minute and does a work of 0.2J per strike. What is the power of hammer in SI system
asked by Navami S (resee) 11 hours ago
3
Please someone upload ICSE Analysis of Pupil's Performance 2016 . I cannot download it. Pls upload it or send a screenshot.
asked by Soham Chakraborty (iamschakraborty) 12 hours ago
1
What is the difference between right hand thumb rule and right hand grip rule? Or is it the same?
asked by Anant Abhyankar (firefistsabo) 12 hours ago
2
Any place or website where I can find all definitions in one place?
asked by Suyash Singh (suyash_singh) 12 hours ago
1
State the functions of two main parts of an ac generator? pls help!!
asked by Abhishek Pai (abhipai) 12 hours ago
2
Is colour determined by frequency??
asked by Ushosee Das (aria124) 12 hours ago
2
Draw a displacement-distance graph for two waves A and B such that the amplitude of wave A is three times that of wave B.
asked by Rita shetty (ritashetty) 12 hours ago
3

+ 5 more questions by ritashetty  

I TOOK PAINS TO TYPE A HUGE ANSWER AND THE PERSON ASKED ANOTHER QUESTION. FML.

http://www.respaper.com/icse/255/340/4666-pdf.html 
question 3 (B)
asked by eeshaan17 12 hours ago
1
http://www.respaper.com/ajinsumesh/4854-zip.html Q7 c
asked by Anshul Sadhale (yolo219) 13 hours ago
0
Concise Pg 59 Numerical No: 5 (With steps) Reply ASAP.
asked by Sherlock (shlokmandloi) 13 hours ago
4

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