Engineering Physics — Summer 2019

Objective Question (MCQ) Mark 1. Unit of Electric Flux Density =______________

C/meter2 (b) C/meter (c) meter/Coulomb (d) C2/meter 2. Curie’s Law is_____

M=T/C (b) T=M/C (c) M=C/T (d) C=T/θ 3. The Dimensional Formula of Surface Tension is

MLT-1 (b) MLT-2 (c) ML1T-2 (d) ML-1T-1 4. Power is measured in

Volts (b) Amperes (c) Joules (d) Watts 5. Kirchhoff’s law is applicable to

AC circuits only (b) DC circuits only

AC & DC circuits (d) Passive Networks only 6. Inertia is___________

Property of matter (b) type of force

Speed of an object (d) None of these 7. Temporary magnets are used in__________

Motors (b) Generators (c) Loud Speaker (d) All of above

Objective Question (MCQ) 1. Which physical parameter is measured by voltmeter?

Current (b) Voltage (c) Resistance (d) Potential Difference 2. The rate of change of momentum is ______

Acceleration (b) Momentum (c) Force (d) Velocity 3. Interactive force between two charges is given by _____Law.

Newton’s (b) Coulomb’s (c) Biot-savart (d) Faraday’s 4. Which of this quantity is unit less?

Sound absorption (b) Reverberation time

Absorption coefficient (d) Loudness 5. What is full form of SONAR?

Sound Navigation & Routine (b) Sound Navigation & Ranging

Submarine Navigation & Range (d) Submarine Navigation & Ranging 6. The Ratio of Einstein’s coefficients A /Bis2112

8πhν3/c2 (b) 6πhν3/c3 (c) 6πhν3/c3 (d) 8πhν3/c3 7. Persistence current is given by

I =4πRH (b) I =2πRH (c) I =2π2RH (d) I =6πRH c c c c c c c c

A Josephson junction has a voltage of 9 µV across its terminals. Calculate the frequency of radiation generated by it. Given h = 6.626x10-34J

Distinguish between type-I & type-II superconductors.

Explain Meissner Effect.

Write a short note on SQUID.

Alaser beam has a power of 50mW. It has an aperture of 5 x 10-3m and wavelength 7000 Å. The beam is focused with a lens of focal length of 0.2m. Calculate the areal spread and intensity of the image.

Explain Laser production from Nd:YAG.

Write Properties of LASER.

Write short note on Acoustic Grating method.

Calculate thickness of quartz plate designed to produce ultrasonic waves at 1st mode of vibration with the frequency of 3MHz. Young’s modulus of quartz crystal is 85 GPa and density of material is 2650kg/m3.

Explain Magnetostriction method for ultrasonic sound generation.

The dielectric constant of diamond is 1.43. Calculate permittivity and electric susceptibility of diamond.

What is Local Field? Derive expression for Claussius-Mosotti equation.

What is dielectric material? Distinguish between a dielectric material and insulator. Explain different types of dielectric polarization?

Aparamagnetic material has magnetic field intensity of 950 A/m. if the susceptibility of material at room temperature is 2.65x10-3. Evaluate the magnetization and flux density of material.

What are metallic glasses? Write its applications.

What are Hard & Soft magnets? Classify Paramagnetic, Ferro-magnetic & Dia magnetic materials in detail.

Write short note on Quantum Confinement.

What are Shape Memory Alloys? Write its applications

List the factors affecting acoustics of building.

Write disadvantages of Nano materials.