An electron (m = 9.11×10-31kg) has a speed of 0.95c. Its kinetic energy is:

• A) 2.2×10-13J
• B) 2.0×10-13J
• C) 1.8×10-13J
• D) 8.2×10-14J

Which of the following has the highest disorder in terms of particle arrangement?

• A) Gas
• B) Solid
• C) Plasma
• D) Liquid

In the context of thermodynamics, the term "adiabatic" refers to a process in which:

• A) No work is done on or by the system.
• B) No heat is exchanged with the surroundings.
• C) The system's internal energy is constant.
• D) The temperature remains constant.

The unit of thermal conductivity might be:

• A) C?/ (cal•cm•s)
• B) Cal/ (cm•s•C?)
• C) Cal•s/ (cm•C?)
• D) Cal•cm/(s•C?)

The center of Newton ring is dark due to:

• A) Diffraction
• B) Polarization
• C) Constructive interference
• D) Destructive interference

What happens to the internal energy of a substance when it is heated at constant volume?

• A) Decreases
• B) Remains constant
• C) Increases
• D) Cannot be determined

If the mass of a particle is zero its speed must be: (C represents the velocity of light)

• A) Infinite
• B) Any speed less than C
• C) C
• D) 0

What will be the energy associated with the photon, if it has a frequency of 5×1014 Hz. [Hint: Planck's constant (h) = 6.63×10−34 J·s]

• A) 3.313×10−48 J/s
• B) 3.313×10−30 J
• C) 3.313×10−14 J
• D) 3.313×10−20 J

The speed of light is generally faster in a medium with:

• A) Changing the refractive index
• B) Constant refractive index
• C) A higher refractive index
• D) A lower refractive index

Possible units for the coe?cient of volume expansion are:

• A) 1/(C?)3
• B) 1/C?
• C) mm3/C?
• D) (C?)3

The appearance of colors in thin film is due to:

• A) Diffraction
• B) Dispersion
• C) Polarization
• D) Interference

Einstein's proposed solution to the photoelectric puzzle was:

• A) Light is composed of small packets called quanta.
• B) Electrons become transparent to certain light frequencies.
• C) Metals emit light in response to the shaking of electrons.
• D) Electrons are ejected due to the temperature increase.

If light of low wavelength is used in young’s double slit experiment, then width of the fringe will:

• A) Double
• B) Decrease
• C) Increase
• D) No change

The primary reason for the increase in pressure of an ideal gas upon heating is:

• A) Increase in the number of atoms
• B) Increase in the average speed of gas molecules
• C) Increase in the density of the gas
• D) Increase in atomic weight

Absolute zero is considered as that temperature at which:

• A) Water freezes
• B) All liquids become gases
• C) All gases become liquids
• D) Ice melts

In time dilation, the time at a slower rate is observed by:

• A) The moving observer
• B) Time is irrelevant in this context
• C) Both observers experience time at the same rate
• D) The stationary observer

How does increasing the intensity of light in the photoelectric effect influence the number of ejected electrons?

• A) Changes the color of the emitted light.
• B) No effect on the number of photoelectrons.
• C) Decreases the kinetic energy of the photoelectrons.
• D) Increases the number of photoelectrons.

Which of the following electromagnetic radiations has photons with the greatest momentum?

• A) blue light
• B) x rays
• C) radio waves
• D) yellow light

When a ray of light travels from a lesser denser medium to denser medium then ______________.

• A) It bends away from the normal
• B) It bends towards the normal
• C) It bends at angle of 90 degree
• D) It follows its previous path

When an electromagnetic wave meets a reflecting surface, the direction taken by the reflected wave is determined by:

• A) the material of the reflecting surface
• B) the index of the medium
• C) the intensity of the wave
• D) the angle of incidence