No. of Printed Pages : 24

CLT-102/

CLT-103/

CLT-104

CERTIFICATE PROGRAMME IN LABORATORY TECHNIQUES (CPLT)

Term-End Examination, June, 2020 CLT-102 : LABORATORY TECHNIQUES IN BIOLOGY CLT-103 : LABORATORY TECHNIQUES IN CHEMISTRY CLT-104 : LABORATORY TECHNIQUES IN PHYSICS

Time : 3 Hours Maximum Marks : 75

Instructions:

(i) This question paper , contains three parts, one each for CLT-102/ CLT-103 and CLT-104 courses. Maximum time allowed for each part is 1 hour.

(ii) Students are required to answer all the three parts in three separate answer books. Write your Enrolment number, Course code and Course title clearly on each of the three answer books.

(iii) Marks are indicated against each question.

P. T. O.

[ 2 ] CLT-102/CLT-103/CLT-104

CLT-102/ CLT-103/ CLT-104

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Time : 3 Hours Maximum Marks : 75

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(31 CLT-102/CLT-103/CLT-104

CLT-102

CERTIFICATE PROGRAMME IN LABORATORY TECHNIQUES (CPLT)

Term-End Examination, June, 2020

CLT-102 : LABORATORY TECHNIQUES IN BIOLOGY

Time : 1 Hour Maximum Marks : 25

Note : Question No. 1 is compulsory. Attempt any

four questions from Question No. 2 to 6.

1. (a) Give one word for each of the following : 5

(i) A collection of dry, pressed and

preserved specimens of plants

arranged systematically for the

purpose of reference.

(ii) Phylum to which flat worms belong.

(iii) The instrument used to measure the

density of coloured solution.

(iv) The dyes which stain chromatin and

are alkaline in nature.

(v) A suction device used to collect small

insects.

P. T. O.

( 4 CLT-102/CLT-103/0-T-104

2. What are various methods of sterilization ?

Describe any one in detail. 5

3. What is Stereo Microscope ? Briefly describe its

parts and operation. 5

4. What is Soil ? Describe different types of soil. 5

5. What is the universal method of drying and

mounting of plant specimens on herbarium

sheets ? Describe briefly. 5

6. Write short notes on any two of the following :

1 2 — each

2

(a) Botanical Garden

(b) Squash Preparation

(c) Use of keys for identification of specimens

[ 5 CLT-102/CLT-103/CLT-104

CLT-102

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P. T. O.

[6] CLT-102/CLT-103/CLT-104

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[7 ] CLT-102/CLT-103/CLT-104

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P. T. O.

[ 8 ] CLT-102/CLT-103/CLT-104

CLT-103

CERTIFICATE PROGRAMME IN

LABORATORY TECHNIQUES (CPLT)

Term-End Examination, June, 2020

CLT-103 : LABORATORY TECHNIQUES IN

CHEMISTRY

Time : 1 Hour Maximum Marks : 25

Note : Answer all questions.

1. Fill in the blanks with appropriate words

chosen from those given in the brackets

alongside for the following. Answer any five

parts : 1 each

(a) A separatory funnel may be used to

separate from water. (ether, acetone)

[ 9 ] CLT-102/CLT-103/CLT-104

(b) For mercury in a graduated glass tube the

reading should be taken by noting the

meniscus. (upper, lower)

(c) Permanent hardness in water is caused by

(magnesium hydrogen• carbonate,

calcium sulphate)

(d) Traces of grease or oil may be removed by

rinsing with a small amount of

(acetone, water)

(e) Gases are soluble at lower

temperatures. (more, less)

(f) If a mixture contains two liquid

components of differing volatility, then the

vapour would be richer in the

component. (more volatile, less volatile)

(g) In thin layer chromatography the mobile

phase is (liquid, solid)

2. Answer any four parts of the following : 2 each

(a) Why solutions of alkali should not be left in

the burette for a long time ?

P. T. O.

[ 10 ] CLT-102/CLT-103/CLT-104

(b) Write down two methods of maintaining

even and gentle boiling when using a direct

burner.

(c) What is the advantage of using fluted filter

paper over normally folded filter paper ?

What is the reason for this advantage ?

(d) How would you prepare lime water

solution ?

(e) What are the uses of (i) a pipette and (ii) a

volumetric flame ?

(t) Write any two precautions for minimising

breakage of glass apparatus ?

3. Answer any four parts of the following : 3 each

(a) Write advantages and disadvantages of a

centrifuge.

(b) What are two main differences in the

apparatus - used between a recrystallisation

carried out using an aqueous solution and

one using petroleum ether as a solvent ?

[ 11 ] CLT-102/CLT-103/CLT-104

(c) Name three kinds of chromatography in

which the mobile phase is a liquid and the

stationary phase is a solid.

(d) Define error. List any four sources of

errors.

(e) 50 cm3 of an aqueous solution of barium

chloride contains 12.2 g of BaC12 .2H20

(Mr = 244). Express the concentration of

this solution :

(i) as a percentage (wt./vol.)

(ii) in molarity.

(f) List different types of glass. Give one use

of each type of alas.

P. T. O.

[ 12 ] CLT-102/CLT-103/CLT-104

CLT-103

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(17 ] CLT-102/CLT-103/CLT-104

CLT-104

CERTIFICATE PROGRAMME IN

LABORATORY TECHNIQUES (CPLT)

Term-End Examination, June, 2020

CLT-104 : LABORATORY TECHNIQUES IN

PHYSICS

Time : 1 Hour Maximum Marks : 25

Note : (i) Attempt all questions.

(ii) Internal choices are provided in each

question.

(iii) Symbols have their usual meaning.

1. Attempt any five parts : 2 each

(a) Write any two possible faults in electric

supply in a physics laboratory.

(b) What is the function of a file and a spanner ?

P. T. O.

[18 ] CLT-102/CLT-103/CLT-104

(c) Define the pitch and least count of a screw

gauge.

(d) Write any two situations in which a

permanent magnet can lose its magnetism.

(e) . State the laws of refraction.

(0 A capacitor is marked with 500 RF.

Calculate the charge on it at 50 V.

(g) Draw the IV characteristics of a p-n

junction diode in forward region.

2. Attempt any three parts : 5 each

(a) (i) What is Soldering ? What are the

things required to carry out soldering ?

3

• (ii) How will you keep your tools rust

fie? 2

(b) What is spring balance ? With the help of a

diagram, explain the working of a spring

balance. 1, 4

(19 ] CLT-102/CLT-103/CLT-104

(c) (i) Define specific heat capacity of a body.

Write its SI unit. 2

For a concave mirror, draw a ray

diagram of an image if the object is

placed between the focus (F) and

centre of curvature (C). Write the

nature of the image formed. 3

(d) (i) Explain the two major differences

between a transformer and an

inductor.

(ii) What is the value of resistor having

the following colour code ? 3

Red, Brown, Orange, Silver

(e) (i) What is an ammeter ? What is the

resistance of an ideal ammeter ? 2

P. T. O.

[20 CLT-102/CLT-103/CLT-104

(ii) Match the instruments listed in

Column I with their functions listed in

3 Column II :

Column I

1. Multimeter (a)

2. Potentiometer (b)

3. Signal generator

(c)

Column II

To measure

resistance to 'a

high degree of

accuracy

To check

continuity of a wire.

To provide AC in

a circuit.

•

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CLT-104

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P. T. O.

[ 221 CLT-102/CLT-103/CLT-104

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P. T. O.

[ 24] CLT-102/CLT-103/CLT-104

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CLT-102/CLT-108/CLT-104 1770