CBSE Class 9 and Class 11 to have PSA test from SA-II onwards

CBSE has asked CBSE affiliated schools to conduct a MCQ based exam called Problem Solving Assessment (CBSE-PSA) for class IX and XI from second term (SA-2) w.e.f. from January-Feburary 2013.
Later the test will be conducted for class X also.

Its score will be added in FA-4 which is 10% of total assessments of Class IX and class XI students will get a certificate. 

CBSE Class 11 - Physics - CH2 - Error Analysis #PhysicsNotes #eduvictors

Error Analysis

Q1: Define error.

Answer: The exact measurement of a physical quaintly is not possible. This is known as Heisenberg's uncertainly principle. Uncertainty in the measurements is called error.

Numerically, the deviation of the measured value from the actual value is called an error.  If X is the quantity measured, then ΔX is called error in X. i.e. Error = Actual value - Measured value.

Class 11 - Physics - CH3 - Motion In a Straight Line (Part-2)

Motion in straight line!
(source:clker.com)

NCERT Chapter Solutions (Q14-onwards)

For Questions (1-13) see page.

Q 3.14: A man walks on a straight road from his home to a market 2.5 km away with a speed of

5 km/hr. Finding the market closed, he instantly turns and walks back home with a speed of

7.5 km /hr. What is the

(a) magnitude of average velocity, and

(b) average speed of the man

over the interval of time

(i) 0 to 30 min,

(ii) 0 to 50 min,

(iii) 0 to 40 min ?

[Note: You will appreciate from this exercise why it is better to define average speed as total path length divided by time, and not as magnitude of average velocity. You would not like to tell the tired man on his return home that his average speed was zero !]

Answer:

CBSE Class 11 - Physics - Units and Measurements - MCQs

Multiple Choice Questions

Q1: Light year is a unit of
(a) time
(b) distance
(c) sunlight intensity
(d) mass

Class 11 - Physics - CH3 - Motion In a Straight Line

Motion in straight line!
(source:clker.com)

NCERT Chapter Solutions

Q3.1 In which of the following examples of motion, can the body be considered approximately a point object:
(a) a railway carriage moving without jerks between two stations.
(b) a monkey sitting on top of a man cycling smoothly on a circular track.
(c) a spinning cricket ball that turns sharply on hitting the ground.
(d) a tumbling beaker that has slipped off the edge of a table.

CBSE- Class XI - Physics - CH2 - Dimension Analysis #class11Physics #eduvictors

NCERT Chapter Solutions and Other Numerical Problems

www.eduvictors.com

Joseph Fourier -
How is he related to Dimensions?

Q1: Define the term 'Dimension' 

Answer: The term 'dimension' is used to refer to the physical nature of a quantity and the type of unit used to specify it. Mathematically dimensions of a physical quantity are the powers to which the fundamental quantities must be raised.

e.g. Dimension of velocity = Displacement / time = [L]/[T] = [M⁰][L¹][T^-1]

You can see your checked IIT JEE answer Sheet Online!

Times Of India and Deccan Herald ran stories that checked answer sheets (optical response sheets ORS) will be available on IITs' websites. 

Welcome ISEET and Good BYE IIT-JEE & AIEEE!

The HRD ministry of Govt Of India is ready to go ahead and conduct common entrance examination from 2013 onwards.

IIT-JEE, AIEEE plus other engineering entrance examinations will be replaced by a new examination called Indian Science Engineering Eligibility Test or ISEET.

Which are the institutes that are going to accept ISEET score?

• 15 Indian institutes of Technology (IITs), IT-BHU, & IS-Dhanbad
• 30 National Institutes of Technology (NITs)
• 5 Indian institutes of Information Technology (IIITs)
• 6 Indian Institutes of Science Education & Research (IISERs).
• Indian Institute of Space Science & Technology (IIST).
• Indian Institute of Science (IISc) – (only BS Course/Programme)
• 3 Indian Statistical Institutes (ISIs).
• Several other Govt./centrally-funded institutions.
• Some pvt. Colleges/universities at National level. (may be)
• Hundreds of State Govt. funded/controlled colleges in various states.
• Others private engineering Colleges in various states.

Who will conduct the ISEET exam?
Most probably CBSE and IITs jointly.

Range of measurement (Class 11 - Physics - Ch2)

Click on the figure to go flash animation to see the range of order of length from 10^-35 m (Planck length) to 10²⁶m, size of visible universe.

courtesy nasa (http://apod.nasa.gov/apod/ap120312.html)

Q1: What is 0.000047 in scientific notation?
Answer: 4.7 x 10^-5

Q2: Q: Students X, Y and Z were asked by their teacher to measure the volume of water in a beaker.
X wrote : 200; Y wrote : 200 mL and Z wrote : 200 Lm
Which one of these answers is correct?
Answer: The first one has no units. Therefore, we do not know what does it mean.
The third is also not correct because there is no unit like Lm.
The second one is the only correct answer because it denotes millilitre.

Q3: Convert 10 inches into meters.
Answer: We know that 1 inch = 2.54 cm (centimeters)