Engineering Physics

Which is NOT a characteristic of a LASER?

• High intensity

• unidirectional

• White light

• Coherent

Which of the following equation represents Simple Harmonic motion?

• y=mx+c

• x= a sin wt

• y = Ae^bt

• x= a (wt)

At resonance,

• the natural frequency becomes equal to applied force frequency

• The amplitude becomes maximum

• damping becomes minimum

• all the three options

Young's modulus of the material is defined as

• Longitudinal strain/Longitudinal stress

• Longitudinal stress/Longitudinal strain

• Volume stress/ volume strain

• linear strain/lateral strain

The concept of matter wave was suggested by_________

• Heisenberg

• Louis de Broglie

• Schrodinger

• Einstein

At 0 kelvin, all the energy levels below fermi level are

• Completely empty

• Completely filled

• Partially filled

• Half filled

The p-type semiconductor is obtained by doping the intrinsic semiconductor with

• pentavalent impurities

• bivalent impurities

• trivalent impurities

• any impurity atoms

Shockwaves propogate in

• subsonic speeds

• ultrasonic speeds

• supersonic speeds

• fastsonic speeds

The principle of optical fibers is

• reflection

• refraction

• total internal reflection

• dispersion

According to Heisenbergs uncertainty principle, which of the following is correct?

• $\Delta x.\Delta p_{x\ }\ge\frac{h}{4\pi}$

• $\Delta x.\Delta p_x\le\frac{h}{4\pi}$

• $\Delta x.\Delta p_x\le\frac{h}{2\pi}$

• $\Delta x.\Delta p_x=\frac{h}{4\pi}$