Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER I/II • EXAMINATION SUMMER- 2017
Subject Code: 310002 Date: 12- 06- 2017
Subject Name: Applied Science-I (physics)
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Each question carry equal marks (14 marks)
Q-1 Answer all questions
Define metre second
Write S I unit of periodic time and frequency
Distinguish surface tension and surface energy
Define refractive index in terms of velocity of light and in terms of angle
Write equation of magnification of lens and explain each term in it
Define isotopes and isobars
Write full form of laser
Q-2 Fill in the blanks
S I unit of energy is joule, newton ,pascal)
Audible range of human ear is to 20 20 to 20,000 above 20,000)
As temperature increases surface tension of liquid increases ,decreases remains constant)
1 GB bytes (109 .100)
Ray has charge (positive,negative,nuetral)
In optical fiber is used as carrier wave sound, light, electric current)
For concave lens ,magnification is always 1
Q-2
Describe Magnetotriction method to produce ultrasonic waves
Write three applications of surface tension in engineering
OR
Q-2
(1)Describe piezoelectric method to produce ultrasonic waves
(2)Write six applications of ultrasonic waves in engineering
Q-3 Draw neat sketch of micrometer screw with nomenclature
Write down laws of refraction
There are 20 threads in 1cm length of screw in micrometer screw and 50 divisions on circular scale
Calculate least count of instrument
OR
Q-3 Describe experiment to find out surface tension of water by capillary rise method
List out applications of X-ray
Surface tension of pure water is 72 D/cm and it rises 2.4 cm in capillary tube, if detergent is added in it,
It falls to 1 cm find out surface tension of water (ignore change in contact angle and density)
Q-4 Write Sabin's formula for reverberation time of sound in big hall and explain each term in it
Define amplitude frequency periodic time wave-length phase of wave
Find out wavelength of sound produced by tuning fork of frequency 512 Hz in air
(Velocity of sound in air is 3X 108
OR
Q-4 Discuss constructive and destructive interference of light with figure
What is polarization of light? Write applications of polarized light
Refractive index of glass is 1.5, if velocity of light in air is 3X 108 m/s. Find out velocity of light in glass
Q-5 Derive N N0 e-λt for radioactive element
Compare α β γ rays
Half life time of radium is 1620 year, find out decay constant for it
OR
Q-5 List out applications of laser in industries, medical and in defense
Describe Coolidge tube to produce X-ray
(c)Write the names and applications of fluorescence and phosphorus materials






S I
GB















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N N0 e-λt β γ