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Engineering Entrance Chemistry Questions

1. The weight of 10 x 1023 atoms of
oxygen is
(a) 32 gm (b) 16 amu (c) 5.34 amu
(d) 5.34 gm (e) None
2. 1.76gms' of CO2 and 1120m1 of CO at
STP are taken in an empty vessel, calculate the total mmiber of moles of molecules present in the vessel
(a) 9 x 1023 moles ()) 9 x 10-2moles
(c) 9 x 6 x 1023 moles
(d) 0.9 moles (e) None
3. 1.2grns of an inorganic base furnishes
1.02gms of hydroxyl ions during a neutralisation reaction in aqueous medium. The equivalent weight of the base is
(a) 120 (b) 56 (c) 20
(d) 10 (e) 40
4. 8.4gms of carbonate of metal on
strong heating gives 4gms of its oxide. Find the equivalent weight of the metal
(a) 20 (b) 6 (c) 24 (d) 12 (e) 32
5. An hydrocarbon contains 85.8% of
carbon. The weight of 5.6 litres of the same gas at STP is found to be 14gms, The molecular formula of the hydrocarbon is
(a) C21-12 (b) C2114
(c) C4H 1 a (d) C41-18 (e) C3H8
6. 1.12m1 of a gas is produced at ATP by
the action of 4.12 mg of an alcohol ROH with methyl magnesiusm iodide. The molecular mass of alcohol is
(a) 8.24 (b) 0.824 (c) 82.4
(d) 824 (e) None
7. 27g of aluminium will react
completely with
(a) 8 g of oxygen (b) 24 g of oxygen
(c) 16 g of oxygen
(d) 48 g of oxygen (e) None


8. The compound with identical crystal
structures and analogous chemical formulae are called
(a) allotropes (b) isotones (c) isomers
(d) isomorphs (e) isodiaphers
9. On reaction with hydrogen 3.6g of an
oxide of metal leaves 3.2g of metallic residue. If the atomic mass of metal is
64, the formula of metal oxide is
(a) M203 (b) M20 (c) MO
(d) MO2 (e) M30
10. The number of oxygen atoms in 0.2mole of decahydrate sodium carbonate is
(a) 1.56 x 1024 (b) 1.56 x 1023
(c) 1.56 x 1025 (d) 3.12 x 1024
(e) None
11. , Which of the following pairs of
compound illustrate law of multiple proportion?
(a) KOH, CsOH (b) H20, D20
(c) ethane, benzene (d) KC1, K.Br
(e) None
12. The percentage of hydrogen in water
and hydrogen peroxide is 11.1 and 5.9% respectively. These figures illustrate
(a) Law of multiple proportions (b)Law of conservation of proportions
(c) Law of reciprocal proportions
(d) Law of combining volumes
(e) Law of constant composition
13. A certain gaseous mixture contains
methane and sulphur dioxide in ratio of 1 : 8 by mass. The ratio of the number of molecules is
(a) 1 : 8 (b) 1 : 2 (c) I: 1
(d) 2 : 1 (e) 3 : 1
14. The balancing of chemical equation is
based on
(a)Law of combining volumes
(b) Law of multiple proportions
(c)Law of conservation of mass
(d) Law of definite proportion
(e) All of these

a) What is a geostationary satellite? b) What are parking orbits?

 a) What is a geostationary satellite? b) What are parking orbits?
Ans.: a) A satellite which appears to be fixed at a place above the earth is called a geostationary satellite. A geostationary satellite has the time period round the earth equal to the rotational period of the earth about its axis ie 1 day.
The orbit of a geostationary satellite round the earth ( at a height of about 36,000 km from the earth's surface) is called the parking orbit of the satellite.
Q.12: Explain the terms (i) Ground wave (ii) Sky wave.
Ans.: i) Ground wave : If a signal transmitted from a certain point on the earth reaches some other point travelling directly along the surface of the earth it is called a ground wave. Radiovvaves having frequencies upto 1500 kHz (wavelength above 200 m) are mainly transmitted through ground because in sky they lose energy very quickly.
Sky wave m If a signal is received at some other point after reflection from the ionosphere, it is called a sky wave. Higher frequency signals are mainly transmitted through the sky because on the ground they are absorbed quickly.


greenhouse effect
The clouds act as 'blankets' of the earth. The lower atmosphere, therefore, is very rich in infrared radiation and all the objects on earth absorb it, gettingheated in the process. This phenomenon is commonly called the greenhouse effect, called so because the water droplets hanging in the atmosphere act as the glass roofs of a green house and are able to trap the radiations. The components of the solar radiation whose wavelength is shorter than those ofviolet light are quite dangerous and can cause damage to living cells. Howevar, nature has given us a protective umbrella called the ozone layer ofthe atmosphere which absorbs these harmful radiations.

If earth did not have an atmosphere would its averaoe su face tempt rat ti re be higher or lower thin what it is now?

If earth did not have an atmosphere would its averaoe su face tempt rat ti re be higher or lower thin what it is now?
Ans.: If there had been no atmosphere on the earth, the surface temperature of would
be lower, because in the absence ofamosphere greenhouse effect cannot .eke place.
!.8: Arrange the following electromagnetic radiations in the aseendin E. order of their wavelength : microwaves, gamma rays, racliowaves, ultraviolet rays. Atm : (i) Gamma rays (ii) Ultraviolet rays (iii) Microwaves (iv) Radiowaves
Q.9: Long distance radio transmission uses short waves. Why?
Ans.: Long distance transmission uses short waves as they are easily reflected by ionosphere. Further, long wavelength sky waves lose their energy very quick-.
. 1 0: What is greenhouse effect? What is its practical utility?
Ans.: The atmosphere is transparent to visible radiation. The other componen --. as ultra
violet and infra:red are absorbed in different layers of the atmosphere. 7- .:Ifrared radiations produce warmth of the atmosphere, which absorbs most of it -:ne sun. The earth is warmed by whatever little radiation it receives. Consequerrf, . the earth itself emits the infrared radiation. The infrared radiation emitted from the f.-.1-..11 cannot cross the lower atmospheric layers of the earth's atmosphere which ref...-ers it back. The clouds also act as very good reflectors and prevent the radiation Ear:- -:scaping.

What are the characteristics of the three chief kinds of radiations that radioactive nuclei emit ?

The three important emanations from radioacdve nuclei are -

1. a - rays which are composed of helium nuclei.

2. 3 - rays which are streams of electrons.

3. 1( - rays which are electromagnetic radiations.

Their main properties may be summarised as follows.

a - rays Material particles - each particle is a helium nucleus - deflected by magnetic and electric fields - speed one-tenth of the speed of light penetrating power low due to heavy mass.

- rays :- Material particles - streams of electrons - deflected by magnetic and electric fields - speed very nearly that of light - high penetrating power.

- rays :- Electromagnetic radiations - speed that of light - unaffected by magnetic and electric fields - most dangerous and most penetrating.

2: a) If a radioactive nuclide of an alkaline earth element undergoes a - particle emission, in what group of the Periodic Table will the daughter element be found?

b) If a radioactive nuclide of group 15 element undergoes 3 - particle emission in what groupswill the daughter element be found

At!.s. a) When a radioactive elements emits an a - particle, the daughter element formed will have a mass number which is 4 units less than that of the parent, and an atomic number which is two units less than that of the parent. If the radioactive nuclide belongs to the family of alkaline earth metals, after loss of 2 units of atomic number, the daughter element formed will be a member of the family of noble gases (zero group).

b) Emission of i3 ray is accompanied by increase of one unit of atomic number without any change in mass number. Therefore the daughter element formed will be an isobar of the parent. If the radioactive parent belongs to Cr 15, the daughter element formed will belong to Gr 16.

What are the important properties of electromagnetic waves?

:Ans.: Some ofthe chief characteristics of electromagnetic waves are

(i) In electromagnetic waves, the directions ofoscillationnn ofthe electric and magnetic fields are perpendicular to each other as well as to the direction of propagation of the wave.

The speed of an em wave.in space is about 3 X 108 miS while in any other medium it depends on the electric and magnetic properties of the medium and not on the amplitude of the field variation.

The electric and magnetic field variations are in. phase, ie both attain theI maxima and minima at the same time and place.

Define the following terms and give examples. (a) Antibiotics and (b) Tranquillizers. acid dyes and basic dyes.

 Define the following terms and give examples.
(a) Antibiotics and (b) Tranquillizers.
Ans. : (a) Antibiotics :- The substances which are prodcued by certainanicro-organisms (fungi bacteria and moulds) and use to inhibit the growth or to kill the micro-organism are known as antibiotics. Penicillin was the first antibiotic which was discovered by Fleming in 1929. Chloramphenicol is a broad spectrum antibiotic. Chloramphenical is used to cure actute fever, typhoid, urinary infection and dysentry etc.
(b) Tranquillizers :- These are the substances which effect the central nervous systern and cure mental diseases. They have the sedative and calming effect but do not induce sleep. But if any drug induces sleep also, it is known as hypnotics. Both tranquillizers and hypnotics are present in sleeping pills. Some important tranqiiillizers are reserpine, luminal and seconal.

 What is the difference between acid dyes and basic dyes.

Acid Dye
1. They contain sodium salt oforganic acids, such as sulphonic acid, car- boxylic acid and phenols.
2. They are used for dyeing natural silk, wool and nylon but cannot dye cot- ton fibre.
3. The acidic groups serve as reactive points for fixing the dye to the fibre
4. Examples: Methyl orange, Methyl red.

Basic Dye

They contain the salt of organic bases i.e., - NH2 group, - NR2 group.

They are used to dye nylon , wool, leather, paper, polyester as well as cotton.

in acidic solution, the cations of -

or -NR2 groups are the reactive sites and are used to attach to the fabric.

Examples: Malachite green.

EXAMINATION, OCTOBER/ NOVEMBER 2000 SOFTWARE ENGINEERING (R)

MAHATMA GHANDHI UNIVERSITY (MG)

B.TECH DEGREE EXAMINATION, OCTOBER/ NOVEMBER 2000
SOFTWARE ENGINEERING (R)

Part A (Short Questions)

1. What are the different aspects that should be specified in an SRS (Software Requirement specification )?

2. What are the major outputs in a development project which follows the waterfall model?

3. What are software metrics ? What is the role of metrics in project management ?

4. What is the use of decision table ?

5. What is an object model ?'What is a link attribute ? Explain with examples.

6. Explain generalization and inheritance.

7. What is structured programming and why is it important?

8. Explain what is UML.

9. Explain how code reviews and walk through are done.

10. Explain what is meant by a Test Plan. (10 x 4 = 40 marks)

Part B

11. (a) Enumerate and explain the steps involved in planning and designing a software.       Or

    (b) (i) Discuss the role of prototyping in a software development process.

        (ii) Differentiate between incremental prototype and throw away prototype.

12. (a) Explain the important steps involved in Object-Oriented Designs tasking a real world application.    Or

    (b) Explain the major differences and similarities between OMT and Structural Analysis / Structural Design (SA/SD)

13. (a) Describe Booch's design methodology.                   Or

    (b) Write short notes on: (i) Analysis model (ii) Design model.

    (iii)                         Implementation model (iv) Test model.

14. (a) (i)  What is Program Documentation ? What is its significance in program development and use ? Discuss the methods of documenting a program.

        (ii) What is the role of Information Hiding in Software Development? How can it be achieved?           Or

    (b) (i) Explain what do you mean by modularity with reference to a software system.

    (ii) Explain the stepwise refinement approach to software development.

15. (a) Distinguish between

    (i)                                  Testing and Debugging a software.

    (ii)                        Verification and Validation of software.

    (iii)                             Software error and Software failure.            Or

    (b) What are the different levels of testing and the goals of the different levels ? Explain how they are conducted.

(5 x 12 = 60 marks)

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