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DO NOT OPEN TH IS TEST BOOKLET UNTI L YOU ARE ASKED TO DO SO

Test Booklet Series

TEST BOOKLET

Electronics & Communication- Paper

Topic Test-Material Science & Instrumentation

Time Al lowed: One Hour

Maximum Marks: 100

INSTRUCTIONS1. IMMEDIATELY AFTER THE COMMENCEMENT OF THE EXAMINATION YOU SHOULD

CHECK THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORN ORMISSING PAGES OR ITEMS ETC. IF SO, GET IT REPLACED BY A COMPLETE TEST

BOOKLET.

2. ENCODE CLEARLY THE TEST BOOKLET SERIES A, B, C,OR DAS THE CASE MAY BE IN

THE APPROPRIATE PLACE IN THE ANSWER SHEET.

3. You have to enter your Roll Number on the

Test Booklet in the Box provided alongside.

DO NOTwrite anything elseon the Test Booklet.

4. This Test Booklet contains 60 items (questions). Each item comprises four responses (answers). Youwill select the response which you want to mark on the Answer Sheet. In case you feel that there is

more than one correct response, mark the response which you consider the best. In any case, choose

ONLY ONEresponse for each item.5. You have to mark all you responses ONLYon the separate Answer Sheet provided. See directions in

the Answer Sheet.

6. All items carry equal marks.

7. Before you proceed to mark in the Answer Sheet the response to various items in the Test Booklet,

you have to fill in some particulars in the Answer Sheet as per instructions sent to you with your

Admission Certificate.

8. After you have completed filling in all your responses on the Answer Sheet and the examination has

concluded, you should hand over to the Invigilator only the Answer Sheet. You are permitted to take

away with you the Test Booklet.

9. Sheets for rough work are appended in the Test Booklet at the end.

10. Penalty for wrong answers:THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATE IN THE

OBJECTIVE TYPE QUESTION PAPERS.

(i) There are four alternatives for the answer to every question. For each question for which awrong answer has been given by the candidate, one-third (0.33)of the marks assigned to that

question will be deducted as penalty.

(ii) If a candidate gives more than one answer, it will be treated as a wrong answereven if oneof the given answers happens to be correct and there will be same penalty as above to that

question.

(iii) If a question is left blank, i.e., no answer is given by the candidate, there will be no penaltyfor that question

DO NOT OPEN TH IS TEST BOOKLET UNTI L YOU ARE ASKED TO DO SO

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1. Consider the following statements about dielectric material:

1. For good dielectric material both dielectric loss and dielectric strength should have low value

2. The losses in a dielectric subject to an alternating electric field are determined by real part of the

complex dielectric constant

3. The losses in a dielectric subject to an alternating electric field are determined by imaginary part

of the complex dielectric constant

Which of the following statements are correct:

(A) 1 & 2 (B) 2 & 3 (C) 1 & 3 (D) 1, 2 & 3

2. Consider the following statements regarding an insulating material connected to an ac signal:

1. Dielectric constant decreases with frequency of alternating field applied

2. Dielectric constant decreases with increase in temperature

3. Dielectric constant depends upon applied voltage of field applied

4. Atomic polarization decreases with increase in frequency of alternating field appliedWhich of the following statement is /are correct?

(A) 1, 2 & 3 (B) 1, 3 & 4 (C) 1, 2 & 4 (D) 1, 2, 3 & 4

3. Which of the following statement is not true for piezo electric transducers:

1. Piezoelectric effect is generally observed in insulators

2. Piezoelectric materials owe their property due to the presence of a centre of symmetry

3. All ferroelectric materials are piezo electric but reverse is not necessarily true

Which of the following statements are correct:

(A) 1 & 2 (B) 2 & 3 (C) 1 & 3 (D) 1, 2 & 3

4. Consider the following statements in respect of a quartz crystal:1. Quartz displays ferroelectric behavior

2. Quartz is used as electric oscillator and can be used for the generation and detection of ultrasonic

waves

3. Quartz crystal is formed by repeating silicate tetrahedrons.

4. Value of dielectric constant for Quartz crystal is very small and is equal to 4.5

Which of the following statements are correct:

(A) 1, 2 & 3 (B) 2, 3 & 4 (C) 1, 3 & 4 (D) 1, 2, 3 & 4

5. Which one of the following has the highest value of dielectric strength:

(A) Air (B) Cotton (C) Glass (D) Mica

6. What is value of dielectric constant for transformer oil:

(A) 3 (B) 4 (C) 5 (D) 6

7. The correct sequence of the following in the increasing order of the values of permittivity is

(A) Air, Vacuum, TaO2, Glass (B) Air, Vacuum, Glass, TaO2

(C) Vacuum, Air, TaO2, Glass (D) Vacuum, Air, Glass, TaO2

8. Consider the following statements :

An insulating material shows polarization due to charged atoms. Its polarizability

1. decreases with applied electric field2. remains independent of temperature at a given field

3. increases with applied electric field at constant temperature

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Z

Y

X

a/2

a/2

Which of the statements given above is/are correct ?

(A) 1 only (B) 1 and 2 only (C) 3 only (D) 2 and 3 only

9. Match ListI with ListII and select the correct answer using the code given below the lists :

ListI ListII

A. Hexagonal crystal 1. a = b = c; = = = 90

B. Rhombo-hedral crystal 2. a = b c; = =90 = 120

C. Triclinic crystal 3. a b c; = =90

D. Monoclinic crystal 4. a b c; 90

Code: A B C D A B C D

(A) 1 2 3 4 (B) 2 1 4 3

(C) 1 2 4 3 (D) 2 1 3 4

10. Consider the following statements :

1. Epitaxial III-V group semiconductor compounds have Zinc blende structure2. GaAs structure is also same as Diamond structure

3. Packing efficiency of Diamond is 68%

Which of the following statements are correct:

(A) 1 & 2 (B) 2 & 3 (C) 1 & 3 (D) 1, 2 & 3

11. Each side of the cube shown above is of length a. What are the Miller indices of the shaded surface:

(A) (100) (B) (123) (C) (221) (D) (121)

12. Which of the following solid has metallic bond :

(A) Solid Argon (B) Copper (C) Silicon (D) NaCl

13. Consider the following statements about Graphite:

1. Structure of graphite is Hexagonal but not HCP structure because there is no atom at the centre

2. Graphite is hard3. Graphite is type of conductor

Which of the following statements are correct:

(A) 1 & 2 (B) 2 & 3 (C) 1 & 3 (D) 1, 2 & 3

14. Consider the following statements about super conductor :

1. It is perfect conductive material

2. It is perfect diamagnetic material

3. It has magnetic susceptibility equal to -1

Which of the following statements are correct:

(A) 1 & 2 (B) 2 & 3 (C) 1 & 3 (D) 1, 2 & 3

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HC

H

HC

H

HC

H

HC

H

TC

TC

TC

TC

T T

TT

15. Which of the following is not the property of type-I superconductor:

(A) It is a conductor of infinite conductivity at all temperatures.

(B) It is conductor with very large conductivity below a critical temperature.

(C) It is a material showing susceptibility as 1 below critical temperature

(D) It is a perfect conductor having conductivity drastically reduced by a critical current.

16. Which of the following statement is not true about super conductors:

(A) Entropy, free energy &specific heat increases on going from super conductors to normal

conductors

(B) A type I superconductor maintained at a temperature T < Tcis subjected to a magnetic field H