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2nd Year Phy Chapter 17

The document is a physics test from The Aspire Academy consisting of multiple choice and short answer questions about materials science topics like stress, strain, elasticity, conductivity, semiconductors, and superconductors. The test was administered on September 7, 2020 and covers Chapter 17 of the F.Sc Part II syllabus. It contains 10 multiple choice questions worth 1 mark each for a total of 10 marks, and 5 short answer questions worth 2 marks each for a total of 10 marks. The test is out of a maximum of 30 marks and students are instructed to attempt all questions within the 60 minute time limit.

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74 views1 page

2nd Year Phy Chapter 17

The document is a physics test from The Aspire Academy consisting of multiple choice and short answer questions about materials science topics like stress, strain, elasticity, conductivity, semiconductors, and superconductors. The test was administered on September 7, 2020 and covers Chapter 17 of the F.Sc Part II syllabus. It contains 10 multiple choice questions worth 1 mark each for a total of 10 marks, and 5 short answer questions worth 2 marks each for a total of 10 marks. The test is out of a maximum of 30 marks and students are instructed to attempt all questions within the 60 minute time limit.

Uploaded by

FAHAD
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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THE ASPIRE ACADEMY

OUR MISSION…QUALITY EDUCATION


78/7, Rana St. Sadaqat Part Sanda Lahore. Phone: 0345-4183877

Physics ( F.Sc Part II ) Time allowed: 60 minutes Test Syllabus: Chapter 17


Date: September 07, 2020 Marks: 30
 Attempt all of the following MCQ’s. Cutting, overwriting or marking more than one answer will result zero mark.
Question: A B C D
01. The ratio of stress to strain is: Constant Zero Negative None
02. Example of polymeric solid is: Plastic Zirconia NaCl Copper
03. Bulk modulus is involved when the deformation is: Two Three One None of
dimensional dimensional dimensional these
04. Once the stress is increased than UTS, the Fracture Elastic limit Proportional None of
material falls into the region of: stress limit these
05. The material used for the core of a transformer: Soft magnetic Hard magnetic Dia-magnetic Steel
material material material
06. Conductors have conductivities of the order: 103 ( Ωm )-1 7
10 ( Ωm ) -1
10-7 ( Ωm )-1 10-6 ( Ωm )-1
07. When the temperature of a semiconductor is Increases Decreases Remains the None of
increased, its electrical conductivity: same these
08. The Young’s Modulus of a perfect rigid body is: 100 10 0 Infinite
09. The specific resistance of the semiconductors 10-4 Ωm to 1010 Ωm to 104 Ωm to None of
ranges from: 10-6 Ωm 1020 Ωm 106 Ωm these
10. The impurity atoms are added to Ge / Si in ratio: 106 : 1 1 : 10 6
1 : 108 108 : 1

SECTION II
 Answer any 5 out of the following Questions. (All questions carry equal marks). - - - - - - - - - - (10)
1. Differentiate between crystalline and amorphous solids with examples.
2. Define Paramagnetic substances and give an example.
3. Define Young’s Modulus. What is its relation and unit?
4. Write a note on superconductors.
5. Define Ferromagnetic substances.
6. What are p type semiconductors? What are the majority charge carriers in them?
7. Differentiate between conductors and insulators in terms of energy bands.

 Answer the following Question. (All questions carry equal marks).- - - - - - - - - - - - - - - - - - - - - (10)
1. (a) Describe an experiment and derive a formula to determine the strain energy stored in a
deformed body.
(b) A 1.0 m long copper wire is subjected to stretching force and its length increases by 20 cm.
Calculate the tensile strain and the percentage elongation which the wire undergoes.

*Course Instructor: Engr. Fahad Tanveer Malik.

Name: ________________________ Roll #: ___________

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