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III Mid

Code No: A109100104 Set No. 1
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
I B.Tech. III Mid Examinations, May– 2010
ENGINEERING PHYSICS
Objective Exam
Name: ______________________________ Hall Ticket No.
A
Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 10.
I. Choose the correct alternative:
1. The material in which spontaneous polarization changes with temperature, is called [ ]
(A) ferroelectric (B) pyroelectric (C) piezoelectric (D) anti-ferromagnetic
2. Nickel zinc ferrites are used as cores in [ ]
(A) radios (B) TV transformers (C) transmitters (D) electromagnets
3. In multimode graded index fiber, light rays travel in different parts of the fiber [ ]
(A) with different speeds (B) with same speed
(C) with minimum speed (D) with maximum speed
4. In fiber optic communication system, the preferable source of light is [ ]
(A) LED (B) sodium lamp (C) mercury lamp (D) laser
5. The residential soundproofing aims to eliminate the effects of [ ]
(A) internal noise (B) reverberation (C) absorption (D) external noise
6. The magnetic susceptibility (χ) of a magnetic material is given by [ ]
(A) χ = (μr -1) (B) χ = (μr +1) (C) χ = (1 - μr) (D) χ = (μo -1)
7. The condition for lasing action is [ ]
(A) excitation (B) meta-stable state (C) population inversion (D) emission
8. The reverberation time for an auditorium is the time required for the intensity of sound to drop to
[ ]
(A) 10-9 times its initial value (B) 10-6 times its initial value
(C) 10-3 times its initial value (D) 10-8 times its initial value
9. Which of the following is not a stage of sol-gel formation? [ ]
(A) Agglomeration (B) Condensation (C) Hydrolysis (D) Sputtering
10. The relation between magnetic induction (B), magnetic field strength (H) and magnetization (M) is
[ ]
(A) B = H + M (B) B = M + μoH (C) B = μo (H + M) (D) M = B + μoH
Cont….2
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www.jntuworld.com
JNTUWORLD
Code No: A109100104 :2: Set No. 1
II Fill in the blanks
11. The unit for measurement of displacement vector is _______________.
12. Above Curie temperature, the shape of B-H curve of a ferromagnetic material is in the form of a _______________________.
13. The phenomenon of expulsion of magnetic lines from a super-conductor is known as _______________________.
14. The unit of Einstein’s coefficient is _______________.
15. The synthesizing of nanomaterials from larger pieces of material, is called ___________ technique.
16. Ionic Polarization is __________________________ temperature.
17. The active element in ruby laser is __________________.
18. The acceptance angle of a fiber of numerical aperture 0.22, is ____________º.
19. A _________________ is a device for reducing the amount of noise emitted by a machine.
20. When the radius of a sphere is reduced to 2.0 nm, the surface area to volume ratio becomes ________________ per meter.
-oOo-
www.jntuworld.com
www.jntuworld.com
JNTUWORLD
Code No: A109100104 Set No. 2
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
I B.Tech. III Mid Examinations, May – 2010
ENGINEERING PHYSICS
Objective Exam
Name: ______________________________ Hall Ticket No.
A
Answer All Questions. All Questions Carry Equal Marks. Time: 20 Min. Marks: 10.
I. Choose the correct alternative:
1. In fiber optic communication system, the preferable source of light is [ ]
(A) LED (B) sodium lamp (C) mercury lamp (D) laser
2. The residential soundproofing aims to eliminate the effects of [ ]
(A) internal noise (B) reverberation (C) absorption (D) external noise
3. The magnetic susceptibility (χ) of a magnetic material is given by [ ]
(A) χ = (μr -1) (B) χ = (μr +1) (C) χ = (1 - μr) (D) χ = (μo -1)
4. The condition for lasing action is [ ]
(A) excitation (B) meta-stable state (C) population inversion (D) emission
5. The reverberation time for an auditorium is the time required for the intensity of sound to drop to
[ ]
(A) 10-9 times its initial value (B) 10-6 times its initial value
(C) 10-3 times its initial value (D) 10-8 times its initial value
6. Which of the following is not a stage of sol-gel formation? [ ]
(A) Agglomeration (B) Condensation (C) Hydrolysis (D) Sputtering
7. The relation between magnetic induction (B), magnetic field strength (H) and magnetization (M) is
[ ]
(A) B = H + M (B) B = M + μoH (C) B = μo (H + M) (D) M = B + μoH
8. The material in which spontaneous polarization changes with temperature, is called [ ]
(A) ferroelectric (B) pyroelectric (C) piezoelectric (D) anti-ferromagnetic
9. Nickel zinc ferrites are used as cores in [ ]
(A) radios (B) TV transformers (C) transmitters (D) electromagnets
10. In multimode graded index fiber, light rays travel in different parts of the fiber [ ]
(A) with different speeds (B) with same speed
(C) with minimum speed (D) with maximum speed
Cont…..2
www.jntuworld.com
www.jntuworld.com
JNTUWORLD
Code No: A109100104 :2: Set No. 2
II Fill in the blanks
11. The unit of Einstein’s coefficient is _______________.
12. The synthesizing of nanomaterials from larger pieces of material, is called ___________ technique.
13. Ionic Polarization is __________________________ temperature.
14. The active element in ruby laser is __________________.
15. The acceptance angle of a fiber of numerical aperture 0.22, is ____________º.
16. A _________________ is a device for reducing the amount of noise emitted by a machine.
17. When the radius of a sphere is reduced to 2.0 nm, the surface area to volume ratio becomes ________________ per meter.
18. The unit for measurement of displacement vector is _______________.
19. Above Curie temperature, the shape of B-H curve of a ferromagnetic material is in the form of a _______________________.
20. The phenomenon of expulsion of magnetic lines from a super-conductor is known as _______________________.
-oOo-
www.jntuworld.com
www.jntuworld.com
JNTUWORLD
Code No: A109100104 Set No. 3
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
I B.Tech. III Mid Examinations, May – 2010
ENGINEERING PHYSICS
Objective Exam