Physics notes along with MCQs are provided here. Kinematics, dynamics, electric and magnetisim, nuclear physics, thermodynamics and all branches of Ph
Physics notes along with MCQs are provided here. Kinematics, dynamics, electric and magnetism, nuclear physics, thermodynamics and all branches of Physics are provided here. This article has been prepared with lot of effort to reduce stress from students and save student's time.
One of the best source for Physics Notes is provided here.
-base vs derived: 2 categories in which physical quantities are divided. 3-types of units (base, derived, supplementary units [plane angle: radian, solid angle: steradian]), -3 most basic units (length, mass, time) 3-systems of units (FPS-British S/M [length, foot; mass, pound; time, sec], CGS or French s/m [length, cm; mass, gram; time, sec], MKS or Metric s/m: [length, meter; mass, kg; time, sec], SI s/m is extended form of MKS s/m. Dimensional: analysis is helpful for deriving possible formula & measuring homogeneity of physical eqn.
-error: occur due to inexperience person, faulty apparatus, inappropriate method. Random error is reduced by taking mean of several measurements. Zero error is type of systematic error. Uncertainty: occurs due to limitation of instrument, natural vibration rations of obj to be measured, inadequate of technique. Absolute uncertainty depends upon least count of instrument. Total in result after in add/subtracting/mul 2-no’s is sum of their absolute uncertainties. To reduce uncertainty in timing experiment, highly precise instrument & count more no of vibration. -accuracy: smaller the least count, more is the measurement accurate.
-fb, websites: raindrops are round because of surface tension forces of water.
-light: light year= 9.15*1015m
-fluids: terminal velocity: Terminal velocity is the maximum velocity attainable by an object as it falls through a fluid. It occurs when the sum of the drag force and the buoyancy is equal to the downward force of gravity acting on the object. Since the net force on the object is zero, the object has zero acceleration. Vt= sqrt(2mg/ACdp) p=density of fluid. M=mass of object, Cd=drag coefficient. A=projected area of object.
-main frontier of fundamental sciences are 3.
Path followed by flow of electrons is called circuit.
How many planets are moving around Sun according to Nasa: 8
Which lens is used to correct short sightedness: concave, -special glasses for solar eclipse are made of lenses,
Visible range to human eye: 400-700nm
Device that accelerates beams of charged particles using high frequency alternating voltage: cyclotron (a type of particle accelerator invented by Ernest O. Lawrence)
when salt is added to water what happens to the boiling point. BP increase
electrons, protons and neutrons are made of Quarks
heart is source of electromotive force in human body
X-rays are used for cancer treatment
Reservoir capacitor is used to smooth the current flow
Refrigerator work on law of thermodynamics
Moon goes away from earth: 3.8cm per year.
Impurities in water: increases freezing point
Nucleus of atom held together: strong nuclear forces
1 mile=1.609km, 1Hectare=2.5acres
Newton, Einstein, Gallio are father of Physics.
Foot pound force (ft.lbf) is unit of energy
Highest penetrating power is of: Gamma rays
synchrotron is an extremely powerful source of X-rays. ... A synchrotron machine exists to accelerate electrons to extremely high energy and then make them change direction periodically. The resulting X-rays are emitted as dozens of thin beams, each directed toward a beamline next to the accelerator.
which type of wire is used in electric kettle: nichrome
types of electromagnetic radiations are more associated with heat
distance of moon and earth: 384,400 km. sun & moon: about 150 million kilometers, earth & sun: 147.24 million km
charge carriers in many metals are: electrons
Manometer is used to measure pressure, galvanometer detect and measure small amounts of current in an electrical circuit, Ammeter or Ampere meter is a measuring instrument used to measure the current in a circuit.
Nonrenewable energy resources include coal, natural gas, oil, and nuclear energy collectively called fossil fuels formed within Earth from dead plants and animals over millions of years. Pressure and heat worked together to transform the plant and animal remains into crude oil (also known as petroleum), coal, and natural gas. Nuclear energy comes from radioactive elements, mainly uranium, which is extracted from mined ore and then refined into fuel.
Renewable energy resources: Wind & solar energy, Hydro energy, Tidal energy, Geothermal energy, Biomass energy.
Which of the following are not EM waves: beta rays.
Electric Current
1.When
n resistances each of value r are connected are in parallel, then resultant
resistance is
A.
nx
B.
rnx
C.
x/n
D.
n²x.
2.Two
bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to
250 volts supply. Power consumed in circuit is
A.33
watt
B.
67 watt
C.100
watt
D
300 watt
3.Resistance of a wire is r ohms. The wire is stretched to double its length, then it's resistance in ohms is
B.
4 r
C.2r
D.
r/4
4
.10⁶ electrons are moving through a wire per second, the current developed is
B.1A
C.1.6×
10-¹³ A
D.
10⁶ A
5.When a wire is stretched and its radius becomes r/2, then its resistance will be
A.
16 R
B.
4 R
C.
2 R
D.
0
6. A wire of uniform cross-section, A length L and resistance R is cut into two equal parts. The resistivity of each part will be
A.
doubled
B.
halved
C.
remains the same
D.
one fourth.
7.The
powers of two electric bulbs are 100w and 200 w. Which are connected to power
supply of 220 V. The ratio of resistance of their filament will be,
B.
2:1
C.
1:3
D.
4:3
8.Thermocouple
is an arrangement of two different metals
9.In
order to achieve high accuracy, the slide wire of a potentiometer should be
B.
As short as possible
C.
Very thin
D.
Very thick
10.When
a potentiometer is used for measurement of voltage of an unknown source, the
power consumed in the circuit of the unknown source under null condition is
A.
high
B.
small
C.
ideally zero
D.
very high
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