I have planned to add "Application Level question/Answers" for Higher secondary physics +1 and +2 topics. I think it will be help full to my students in their studies. Also I invite my teacher friends to post comments referring to the problems.
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Sunday, February 24, 2013
Plus1 previous Question papers
Model examination Feb 2013  Physics
Class : plus1 (HSE 1)
Syllabus : SCERT / NCERT
Class : plus1 (HSE 1)
Syllabus : SCERT / NCERT
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Wednesday, July 4, 2012
Plus 1 : UNITS AND MEASUREMENTS
CHAPTER 1 :UNITS AND MEASUREMENTS
 WHAT IS A PHYSICAL QUANTITY? GIVE EXAMPLES?
Any thing that can be measured is
a physical quantity. Example : length,
mass, time
Velocity, density
 What is a Unit? Give examples?
Units are certain reference
standards used for making measurements.
Example: m/s, kg/ m^{3}, Km, Kg
 What are fundamental quantities and fundamental Units?
The physical quantities mass, length and time are known as fundamental
quantities.
They are called so because, Units
of all other quantities in mechanics can be derived from fundamental
units. Also they can not be sub divided
in to smaller units
Units of fundamental quantities
are known as fundamental units.
(meter , kilogram, second )
 What are derived quantities and derived units?
Physical
quantities that can be expressed in terms of fundamental quantities are
known as derived quantities.
(example :
m/s , m/s^{2}, m^{3 })
Note: Two parts for measured result:
Any measurement has two parts
 Its magnitude
 Its Unit
If we decrease the size of the
unit, the numerical; value will increase.
1 Km = 1000 m
Here Km is a large unit of length,
while magnitude is 1
But, meter is a small unit of
length and its magnitude is 1000
Smaller the size of the unit, greater is its numerical value.
 What are the characteristics of a unit , that is chosen for making measurement ?
The unit that is chosen for making
a measurement should have the following properties:
 It must be well defined.
 It should be of suitable size
 It should be accepted internationally
 It should not change with change in temperature, pressure ,etc
 What are the different system of units ?
CGS – Centimeter, gram , second
FPS – Foot, Pound, Second
MKS – Meter, Kilogram, second
 What are the physical quantities and units in SI system?
7 Basis physical quantities
of SI unit system are
Length

meter

M

Mass

Kilogram

Kg

Time

Second

S

Temperature

Kelvin

K

Electric current

Ampere

A

Luminous intensity

Candela

Cd

Quantity of matter

Mole

mol

2 Supplementary quantities of SI
system are
Plane angle

Radian

rad

Solid angle

Steradians

sr

 Define 1 meter in 3 ways ?
1) It
is 1 / (10^{7}) th of the distance from north pole to equator of earth
1 meter  old definition 
2) 1
meter is the distance between two lines marked on a PlatinumIridium rod
Kept at a constant temperature of
273.16 K and at 1 bar pressure in the
International bureau of weights
and measures at severs near Paris in France.
3) 1
meter is equal to 1650763.73 times the
wavelength of orange red light
Emitted by Kr86 source, kept at
triple point of Nitrogen.
1 Kg is equal to the mass of Platinum – Iridium cylinder of diameter equal to its height, kept at international bureau of weights and measures.
Many units to measure length
1 Km = 10^{3} m
1 deci meter = 10^{1} m
1 centi meter = 10^{2} m
1 milli meter = 10^{3} m
1 micro meter = 10^{6} m
1 angstrom = 10^{10} m
1 fermi = 10^{15} m
9 . Define 1 Kg
1 Kg is equal to the mass of Platinum – Iridium cylinder of diameter equal to its height, kept at international bureau of weights and measures.
Definition of 1 Kg 
Many units to measure mass
1 Kg = 1000 gm
1 Ton = 1000 Kg
1 Quintal = 100 Kg
1 gm = 1000 mg
10. Define 1 second
(a) 1
second is the duration of 9,192,631,770 periods of the radiation corresponding
to the transition between the two hyperfine levels of Cesium – 133 atom in ground state.
(b) 1
second is defined as 1 / (86,400) th
part of a mean solar day.
Mean solar day is the average of
all solar days in a single year.
11. Define 1 Ampere
1 Ampere is that constant current
which if maintained in two straight parallel conductors of infinite length , of
negligible cross section and placed 1 m apart in vacuum , would produce between
these conductors a force equal to 2 x 10^{
7} N
12. Define 1 Radian
1 Radian is the plane angle between
two radii of a circle which cutts off on the circumference an arc equal to the
radius of the circle.
1 radian 
360 degree = 2
∏ radian
There for, 1 radian
= 180 / ∏ degree
13. Define 1 Steradian
1 Steradian is the solid angle
which with its vertex at the center of a sphere cuts off an area on the
surface of the sphere equal to that of a square having sides of length equal to
the radius of the sphere.
Order of Magnitude
To estimate how big or small a
given physical quantity , we can use the idea of
Order of magnitude.
The given magnitude is expressed
as a x 10 ^{b}
Where ‘a’ is a number between 1 and 10
Number ‘b’ can be +ve or –ve
If
a > 5 , then order of
magnitude = b+1
If
a < =5, then order of magnitude = b
For example :
Diameter of earth 1.28 x 10^{7} m
Order of magnitude = 7 and it is of the Order of 10^{7}
Distance between two points is measured as 7.25 x 10^{10} m
Its order of magnitude is 10^{9} and It is of the Order of 10^{9}
Sunday, July 31, 2011
Entrance Question Answers: Motion in Stright line
Q1.
Let t is the time interval between A,B,C and D positions
That means, 3t second taken to travel from A to D.
That is, 10 m traveled in 3t seconds.
S = ut + 1/2 a t^2
10 = 0 + 1/2 x 10 (3t)^2
10 = 5 x 9 x t^2
t^2 = 2/9
Now,
S1 = ut + 1/2 g t^2
S1 = 0 + 1/2 x 10 x 2/9 = 10/9 m (AB length)
S1 +S2 = 0+1/2x10x(2t)^2
S1 +S2 = 0+1/2x10x(2x2/9)^2 = 40/9 m (AC length)
S1+S2+S3 = 0+1/2x10x(3t)^2
S1+S2+S3 = 0+1/2x10x(32/9)^2 = 10m (AD length)
Water drops from the roof of a building 10 m high. The drops fall at regular intervals of time, the first drop striking the floor at the instant the 4th drop begins to fall. Find positions of individual drops,when a drop strikes the floor?
Let t is the time interval between A,B,C and D positions
That means, 3t second taken to travel from A to D.
That is, 10 m traveled in 3t seconds.
S = ut + 1/2 a t^2
10 = 0 + 1/2 x 10 (3t)^2
10 = 5 x 9 x t^2
t^2 = 2/9
Now,
S1 = ut + 1/2 g t^2
S1 = 0 + 1/2 x 10 x 2/9 = 10/9 m (AB length)
S1 +S2 = 0+1/2x10x(2t)^2
S1 +S2 = 0+1/2x10x(2x2/9)^2 = 40/9 m (AC length)
S1+S2+S3 = 0+1/2x10x(3t)^2
S1+S2+S3 = 0+1/2x10x(32/9)^2 = 10m (AD length)
Tuesday, June 14, 2011
Electric charge density
Suman m.s said...
sir...one doubt in problem follows
Anish V Rajan said...
sir...one doubt in problem follows
The earth has on electric charge that causes an electric field near its surface of the order of 100 vm1.What is the surface density of charge on earth of earth is a conducting sphere? pls help me 2 solve it
Anish V Rajan said...
Take earth as a conducting sphere of surface charge density (sigma)
Assume total charge that is spread on the surface is Now concentrated on the center. Find Electric field at the surface by usual equation
Sunday, March 20, 2011
Work Power and Energy
Q1 Certain physical quantities are listed below. Select any three pairs of physical quantity with same dimension.
(1) Stress (2) Energy (3) Displacement (4) Force (5) Work
(6) Pressure (7) Torque (8) Weight (9) Velocity
A1. Stress & Force, Energy & Work, Force & Weight
Q2 In the above question, Select the odd one ? Write the uses of dimensional analysis ?
A2. odd one is Torque because it is related to circular motion.
Uses of dimensional analysis are
I. Check the correctness of an equation
II. Derive an equation relating to two or three physical quantities
III. Find dimension of constants in an equation
IV. Convert unit from one system to another.
(1) Stress (2) Energy (3) Displacement (4) Force (5) Work
(6) Pressure (7) Torque (8) Weight (9) Velocity
A1. Stress & Force, Energy & Work, Force & Weight
Q2 In the above question, Select the odd one ? Write the uses of dimensional analysis ?
A2. odd one is Torque because it is related to circular motion.
Uses of dimensional analysis are
I. Check the correctness of an equation
II. Derive an equation relating to two or three physical quantities
III. Find dimension of constants in an equation
IV. Convert unit from one system to another.
Motion in one dimension
Q1. A balloon raises with constant velocity 10 m/s. A load tied by a rope to the balloon is cut when it is at a height of 500 m.
(a) How long will it take to reach the ground ?
A1.
Here Initial velocity u = 10 m/s ( Positive , since direction of initial motion is positive)
Displacement , S =  500 m (towards downward  against initial motion direction)
Acceleration (due to gravity) , a =  9.8 m/s2 (also downwards  against initial motion direction)
Use equations: S = ut + 1/2 a t2
See answer as : t = 11.12 seconds
(a) How long will it take to reach the ground ?
A1.
Here Initial velocity u = 10 m/s ( Positive , since direction of initial motion is positive)
Displacement , S =  500 m (towards downward  against initial motion direction)
Acceleration (due to gravity) , a =  9.8 m/s2 (also downwards  against initial motion direction)
Use equations: S = ut + 1/2 a t2
See answer as : t = 11.12 seconds
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