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

A consequence of Einstein’s theory of relativity is:

• A) Moving rods are longer than when they are at rest
• B) Every thing is relative
• C) Light has both wave and particle properties
• D) Moving clocks run more slowly than when they are at rest

What fundamental principle explains the observation that electrons in an atom can only exist in certain definite energy states?

• A) Conservation of energy
• B) Quantization of energy levels
• C) The uncertainty principle
• D) Principle of superposition

The proper time between two events is measured by clocks at rest in a reference frame in which the two events:

• A) Occur in Boston
• B) Occur at the same time
• C) Satisfy none of these given
• D) Occur at the same coordinates

How does the position of an object relative to a concave mirror affect the size of its virtual image?

• A) Farther objects have larger images.
• B) Closer objects have larger images.
• C) Only objects at the center have images.
• D) The size is always the same regardless of distance.

What does it mean for a wave to be coherent?

• A) A wave with varying frequency
• B) A wave with same speeds
• C) A wave with a constant phase
• D) A wave with the same intensity

The phenomenon in which hot bodies emit radiation is known as_____.

• A) Gamma radiations
• B) Visible light
• C) X-rays
• D) Black-body radiation

A particle with rest mass m moves with speed 0.6c.Its kinetic energy is:

• A) mc2
• B) 0.18mc2
• C) 0.22mc2
• D) 0.25mc2

According to the Stefan-Boltzmann Law, what is the relationship between the power radiated per unit area (P) and the temperature (T) of a hot body?

• A) P ∝ T2
• B) P ∝ T
• C) P ∝ T4
• D) P ∝ T−1

If torsional constant is increased by 4 time, the time period of torsion pendulum becomes,

• A) Half
• B) Remains same
• C) Quadruple
• D) Double