Chemistry BSc-II (Honours)

THERMODYNAMICS

BSC-II

1.      An iron cube at a temperature of 400^o C is dropped into an insulated bath containing 10kg water at 25^o C. the water finally reaches a temperature of 50^o C at steady state. Given that the specific heat of water is equal to 4186 J / kg K. find the entropy changes for the iron cube and the water. Is the process reversible? If so why?

2.      Derive Entropy of a mixture of Ideal Gases

3.      Calculate the entropy changes of an Ideal Gas in different processes?

4.      Derive the Entropy changes for a reversible process.

5.      Prove that Entropy is a Property.

6.      Explain Clapeyron-Clausius Equation and also give its derivation.

7.      Explain the concept of Fugacity?

8.      Define Kelvin Planck and Clausius statements of the second law of Thermodynamics.

9.      A Carnot engine has the same efficiency (i) between 100 K and 500 K and (ii) between T K and 900 K. Calculate the temperature T of the sink.

10.  An ideal gas is heated from temperature T₁ to temperature T₂ by keeping its volume constant. The gas is expanded back to its initial temperature according to the law PVⁿ = constant.  If the entropy changes in the two processes are equal, find the value of n in terms of the adiabatic index γ

11.  A Carnot engine converts one fifth of the heat input into work. If the sink temperature is reduced by 80^o C, the efficiency gets doubled. Find the source and the sink temperature. Also give the consequences of the Carnot cycle.

12.  Carnot engine working between a source temperature of T₂ and sink temperature of T₁ has efficiency of 25%. If the sink temperature is reduced by 20^o C, the efficiency is increased to 30%. Find the source and the sink temperature.

13.  A Carnot engine converts one sixth of the heat input into work. If the sink temperature is reduced by 62^o C, the efficiency gets doubled. Find the source and the sink temperature.

14.  Calculate the maximum efficiency of an engine operating between 120^o C and 35^o C

15.  Define Carnot Theorem and also give its proof.

16.  Calculate the net efficiency of a Heat Engine?

17.  Explain Cyclic Process with example.

18.  Define the spontaneous processes with example

19.  Discuss the limitations of the first law of Thermodynamics.

Biology Class 10

Life Processes (Nutrition)

Class 10 (CBSE)

Very Short Answers (1 Mark)

 1. State one difference between autotrophic and heterotrophic mode of nutrition.

2. What is the role of saliva in the digestion of food?

 3. What is the role of acid in our stomach?

4. What is the mode of nutrition in fungi and plasmodium?

Short Answers (2 Marks or 3 Marks)

1.       How is small intestine designed to absorb digested food? (2)

2.       Meat is easier to digest as compared to grass. Why?  (2)

3.       Discuss the mode of nutrition in amoeba.  (2)

4.       (ii) Describe the role of following in digestion.  (3)

a) Bile 

b) Salivary amylase 

c) HCl 

5.       What is the role of following in human digestive system  (2) 

a) Bicarbonate       

b) Trypsin

Long Answers (5 Marks)

1. Explain the process of digestion of food in mouth stomach and small intestine in human body. Draw a well labeled diagram.

BIOLOGY CHAPTER : REPRODUCTION CLASS -XII (REPRODUCTION)

Biology

1.     Expand MTP and ICSI. (1)

2.     Why is emasculation done in the process of hybridization? (1)

3.     State the function of leydig cells.  (1)

4.     Write the scientific name of causative agents of :--

i)                   Syphillis      ii) Gonorrhoea.                     [1]

5.     Mention the different stages of sexual reproduction. (2)

6.     Describe the structure of a sperm with a diagram. (2)

7.     What are STDs? Mention any two of it. (2)

8.     Draw a labeled diagram of mature embryo sac & label the following

i)                   Egg cell ii) Antipodal cells iii) Synergids iv) Polar nuclei    (2)

9.     What are cleistogamous flowers? Can cross – pollination occurs in

cleistogamous flowers. Give reason? [2]

10.                        What is corpus luteum. How dose it functions as endocrine gland? [2]

11.                        Mention any four objectives of RCHC. [2]

12.                        Briefly describe the stages of spermatogenesis in human? [3]

13.                        What is triple fusion? Where does it occur? (3)

14.                        Give any three differences between asexual and sexual reproduction. (3)

15.                        List any three differences between wind pollinated flower & insect –

pollinated flower. (3)

 Dr. Aamarpali Roy Phd. Chemistry Contact for Tuition All Boards (English Medium) MOBILE Number :9051345485 For Class 8th -10th:- Science (Physics/chemistry/biology/maths) Class 11th and 12th :- Chemistry/Physics/Biology) B.sc. Part-I/II/III: - Chemistry (Organic/inorganic/physical chemistry) M.sc Part-I & II:-Chemistry (Organic/inorganic/physical chemistry/ spectroscopy)) MOBILE Number :9051345485

CENTRAL BOARD OF SECONDARY EDUCATION SENIOR SCHOOL CERTIFICATE EXAMINATION 2017 (CLASS XII) DATE SHEET

CENTRAL BOARD OF SECONDARY EDUCATION SECONDARY SCHOOL EXAMINATION 2017 (CLASS X) DATE SHEET

Mole concept

Measuring matter

• A mass

• A volume

• A count

Count

• One dozen = 12

• One mole = Avogadro’s number of items

• Avogadro’s number = 6.022 x 10²³

Molar Mass – the mass of one mole of a substance

Determine the molar mass of the following substances.

1. Carbon C = 12.011 g/mol

2. Iron Fe = 55.847 g/mol

Converting between moles and mass.

Example: What is the mass of 5.00 mol of water?

Mass = (moles)(molar mass)

= (5.00 mol)(18.105 28 g/mol) = 90.0764

= 90.1 g/mol )

Molar Volume

• The volume occupied by one mole of a gas at STP

• STP = standard temperature and pressure

• STP = 0ºC and 101.3 kPa

• The molar volume of any gas at STP is 22.4 L/mol

Example: What is the volume of 3.00 mol of carbon dioxide at STP?

Volume = (moles)(molar volume)

= (3.00 mol)(22.4 L/mol)

= 67.2 L )

Dr Aamarpali chemistry tutor chemistry teacher at Kolkata 9051220005

http://TutorIndia.net/Tutor_Profiles-OTcwMw-Dr_Aamarpali_Roy

Class XI (Physics) Chapter 1 CBSE

Class XI                                                                                      

Subject: Physics                                                                                    Boards CBSE

1. Explain Rutherford α scattering experiment.                                                                 (2)
2. A stone and a feather dropped from the same height do not reach the ground at the same. Reason?                                                                                                                                              (2)
3. Match the following columns:                                                                                           (2)

Name	Major Contribution/Discovery
Archimedes	Ultra short radio waves
Albert Einstein	Explanation of photoelectric effect; Theory of relativity
J C Bose	Principle of buoyancy; Principle of the lever
Michael Faraday	Laws of electromagnetic induction

1. Match the Link Between Technology and Physics                                                         (2)
   
   

Technology	Scientific Principle
Sonar	Generation, propagation and detection of electromagnetic waves
Lasers	Light amplification by stimulated emission of radiation
Radio and television	Detection of cosmic radio waves
Telescope	Reflection of ultrasonic waves

1. Write differences between Gravitational forces and Electromagnetic forces.         (2)
2. Explain Strong Nuclear Force and Weak Nuclear Force.                                               (1)
3. A vehicle moving with the speed of 18kmh-1 covers ____m in 1s?                           (1)
4. Fill in the blanks by suitable conversions of units

1. 1 kgm²s^-2  = ____gcm²s^-2.
2. 1m = _____ly
3. 3.0ms^-2 = ____kmh^-2
4. G = 6.67 x 10^-11Nm²(kg)^-2 = (cm)³ s^-2 g^-1                                                                      (2)

1. With which method we can measure large distance of a planet or a star from the earth? Explain.     (2)
2. The sun’s angular diameter is measured to be 1920”. The distance D of the Sun from the Earth is 1.496x 10¹¹m. What is the diameter of the sun?                                                           (2)
3. What is the full form of NPL? What is it’s responsibility in our country?                   (1)
4. Write differences between accuracy and precision?                                                   (2)
5. What do you understand by Systematic errors? Explain and name them.                (1)
6. We measured the period of oscillation of a simple pendulum. In successive measurements, the readings turn out to be 2.63s, 2.56s, 2.42s, 2.71s and 2.8s.
   Calculate the absolute errors, relative error or percentage error.                            (2)
7. The temperatures of two bodies measured by thermometer are t₁ =20⁰C+0.5⁰C and t₂=50⁰C + 0.5⁰C. Calculate the temperature difference and error there in.                                         (2)
8.  Write number of significant figure in the following

1. 3.00
2. 123000
3. 2.308
4. 0.02308                                                                                                                         (2)

1. The SI unit of energy is J=kgm²s^-2; that of speed v is ms^-1 and of acceleration a is ms^-2. Which of the formulae for kinetic energy (K) given below can you rule out on the basis of dimensional arguments (m stands for mass of the body):

1. K=m²v³
2. K=(1/2)mv²
3. K=(3/16)mv²
4. K=(1/2)mv² + ma                                                                                                          (2)
   
   

http://idcinternationaljournal.com/index.php IDC INTERNATIONAL JOURNAL (A Peer Reviewed Journal)

http://idcinternationaljournal.com/index.php

Mars orbiter sends first snap - The Hindu

Mars orbiter sends first snap - The Hindu

What is X-Ray photograph?

An X-Ray photograph of any part of body can be taken by interposing that part between the X-Ray tube and the photographic plate.
They are highly penetrating rays and can pass through several materials which are opaque to ordinary light.
These rays can easily pass through flesh and are stopped by bones, the skeleton structure of the concerned part is revealed on the photographic plate. Such a photograph easily detects fractures, foreign matter like a safety pin in throat or a bullet in limb. 

http://www.idcinternationaljournal.com/

http://www.idcinternationaljournal.com/

Pertaining to government

Government by the nobility-                                               aristocracy
Government by the department of state -                            bureaucracy
Government by a few -                                                      oligarchy
Government by the wealthy-                                               plutocracy
Government by the worst citizens-                                      kakistocracy
Government by a military class -                                         stratocracy

Logarithm

The logarithm of a number to a given base is the index of the power to which the base must be raised to be equal to that number.

Thus if a^x= N, then x is the logarithm of N to the base a, and written as x =log _aN

For example, 100 =10²                  so     log₁₀¹⁰⁰ = 2

 and (.0001) =(.1)⁴                        so     log (.0001) = 4

Conversely, if  log_aN = x           then             N = a^x.

Some important deductions.

(i)                         log_a¹ = 0 or log of 1 to any base = 0 [ a⁰=1]

(ii)                      log_aa = 1 or log of any number to the same 

           base =1 [ a’ =a]

(iii)                   log_a∞= ∞, for values of a>1.   [ a^∞ =∞]

(iv)                   log_a⁰= -∞, for values of a>1.   

                [ a^-∞ =1/a^∞= 1/^∞=0]

Do we know?

IBM = International business machines

ENIAC= Electronic numerical integrator and cal

EDVAC =Electronic discrete variable automatic computer

EDSAC = Electronic delay storage automatic calculator

UNIVAC = universal automatic computer

IC = Integrated circuit

IC’s = Integrated Circuits

MSI = Medium scale integration

SSI = Small scale integration

LSI = Large scale integration

VLSI = Very Large scale integration

DIPS = Date information processing system

LIPS = Logic information

PROLOG = Programming in log

Some important terms

A disease affecting many persons at the same place and time ≈ epidemic

A disease widely epidemic ≈ pandemic

A disease confined to a particular district or place ≈ endemic

A disease affecting widely scatters groups of people ≈ sporadic

A substance which destroys or weakens germs ≈ antiseptic

A substance used by dentists to deaden the gum and nerve ≈ cocaine

A substance used in surgery to produce unconsciousness ≈ chloroform

Any medicine which produces insensibility ≈ anaesthetic

A medicine which alleviates pain ≈ anodyne

The mark or scar left after a wound is healed by ≈ cicatrice, cicatrix

The powder or paste (usually sweet smelling) used for cleaning the teeth ≈ toothpaste, dentrifice

A medicine to counteract poison ≈ antidote

An instrument used by physicians for listening to the action of the heart and lungs ≈ stethoscope

Free or exempt from infection ≈ immune

To place apart to prevent from infecting other ≈ isolate

A medice for producing sleep ≈ narcotic opiate

A medicine to cause vomiting ≈ emetic

Confinement to one place to avoid spread of infection ≈ quarantine

To cut off a part of a person’s body which is infected ≈ amputate

A cure for all diseases ≈ panacea

One who is recovering from illness ≈ convalescent

Gradual recovery from illness ≈ convalescent

A vehicle for conveying sick or injured people to the hospital ≈ ambulance

Want or poorness of blood ≈ anaemia

Affecting the lungs ≈ pulmonary

A substance to keep down evil smells ≈ deodorant

To be able to tell the nature of a disease by its symptoms ≈ diagnosis

To disinfect by smoke ≈ fumigate

The science of disease of the human body ≈ pathology

The mosquito which transmits malaria ≈ anopheles

The mosquito which transmits filaria ≈ culex

The mosquito which transmit yellow fever ≈ stegomyia