CBSE Class 11 - Physics - Work, Energy and Power (Assignment-1) (#cbseNotes)

WORK ENERGY POWER (Assignment-1)

Q1. A water pump lifts water from a level 10 m below the ground. Water is pumped at a rate of 30
kg/minute with negligible velocity. Calculate the minimum horse power the engine should have to
do this?

Answer: 6.6 × 10⁻² hp

Q2. A man weighs 60 kg. Calculate work done by gravity as he climbs a ladder of heights 5m.

Answer: -2940 J

Q3. A body of mass 0.3 kg is taken up an inclined plane of length 10 m and height 5 m, and then allowed
to slide down to the bottom again. The coefficient of friction between the body and the plane is 0.15
What is the
(a) Work done by the gravitational force over the round trip?
(b) Work done by the applied force on the upward journey?
(c) Work done by the frictional force over the round trip
(d) Kinetic energy of the body at the end of the trip?

Answer: zero, 18.5 J, -7.6J, 10.9J

Q4. A pump can throw up 10 quintals of coal per hour from a coal mine 120 m deep. Calculate the power of the engine in watt assuming that efficiency is 80%.

Answer: 408.3 watt

CBSE Class 11 Physics - Syllabus (2017-18) (#cbseNotes)

Physics -Syllabus (2017-18)

CBSE Class 11

Here presents the prescribed syllabus for Class 11 Physics for the curriculum 2017-18.

CBSE REVISION TEST PAPER CLASS - XI PHYSICS (Laws of Motion) (#cbsepapers)

Laws of Motion

Chapter Revision Test

Q1:  A person jumps from the roof of a house with a box of weight W on his head. What will be the weight of the box as experienced by the person during jump? [1]


Q2: Which of the following is scalar quantity? Inertia, force and linear momentum. [1]


Q3: Action and reaction forces do not balance each other. Why? [1]

CBSE Revision Test - Class 11 - Physics - Motion in Straight Line (#cbsenotes)

Motion in Straight Line

Chapter Revision Test

Q1. A railway train 400m long is going from New Delhi railway station to Kanpur. [1]
   Can we consider railway train as a point object?


Q2. Shipra went from her home to school 2.5km away. On finding her home closed she [1]
   returned to her home immediately. What is her net displacement? What is the total
   distance covered by her?


Q3. Can speed of an object be negative? Justify [1]

CHAPTER REVISION TEST - CLASS XI - PHYSICS (Work, Energy and Power) (#cbsenotes)

Work, Energy and Power

CHAPTER REVISION TEST 

CLASS XI - PHYSICS 

Q1: When an air bubble rises in water, what happens to its potential energy? [1]

Q2: A spring is cut into two equal halves. How is the spring constant of each half affected? [1]

Q3: What should be the angle between the force and the displacement for maximum and minimum work? [1]

Q4: The momentum of an object is doubled. How does it’s. K.E. change? [1]

Q5: What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes?  [1]

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)