When light is incident perpendicular to the surface, what will be the angle of incidence and the angle of reflection?

• A) Angle of incident = 0°, Angle of reflection = 0°
• B) Angle of incident = 0°, Angle of reflection = 90°
• C) Angle of incident = 90°, Angle of reflection = 0°
• D) Angle of incident = 45°, Angle of reflection = 0°

Which of the following is a necessary condition for total internal reflection?

• A) The angle of incidence in the rarer medium must be greater than the critical angle.
• B) The angle of incidence in the denser medium must be greater than the critical angle.
• C) The angle of incidence in the denser medium must be less than the critical angle.
• D) The angle of reflection in the denser medium must be greater than the critical angle.

The special theory of relativity treats the problem involving:

• A) Accelerated frames
• B) Inertial frames
• C) Any of these
• D) Non inertial frames

which of the following is the difference between sound and light waves:

• A) sound is not subject to diffraction
• B) sound is a torsional wave rather than a longitudinal wave
• C) sound is a longitudinal wave rather than a transverse wave
• D) sound does not require energy for its origin

Which law or principle says that every point on a wave front may be considered a new wave source?

• A) Huygens’s Principle
• B) Snell's Law
• C) Superposition Principle
• D) Braggs law

In special relativity, the factor (γ) becomes significant as:

• A) Acceleration of the object approaches the speed of light
• B) Speed of the object approaches the speed of light
• C) Independent from the speed of the object
• D) Speed of the object approaches zero

As compared to the distance measured by an observer on Earth, the distance from Earth star measured by an observer in a moving spaceship would seem:

• A) Same
• B) Much larger
• C) Smaller
• D) Larger

Bending of light around the edges of an obstacle called:

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

Due to relative motion of observer and the frames of reference of events, time always:

• A) Continuous itself
• B) Stretches itself
• C) Contracts itself
• D) Statics itself

In special relativity, the factor $\gamma$ is defined as:

• A) $${\text{ }}\gamma = \sqrt {1 - {{\left( {{\text{v}}/c} \right)}^2}}$$
• B) $${\text{ }}\gamma = 1 - {\left( {{\text{v}}/c} \right)^2}$$
• C) $${\text{ }}\gamma = \frac{1}{{\sqrt {1 - {{\left( {{\text{v}}/c} \right)}^2}} }}$$
• D) $${\text{ }}\gamma = \frac{1}{{\sqrt {1 + {{\left( {{\text{v}}/c} \right)}^2}} }}$$

The relation between the radius of curvature and the focal length of a spherical mirror is given by:

• A) $f=R^2$
• B) $f={R\over2}$
• C) $f=R$
• D) $f=2R$

Who proposed that light striking a surface was made of packets called quanta?

• A) Maxwell
• B) Planck
• C) Aether
• D) Einstein

Which method(s) of heat transfer can take place in vacuum?

• A) Convection
• B) Radiation
• C) Conduction
• D) Conduction & Convection

Which property of light causes the formation of Newton's rings?

• A) Diffraction
• B) Interference
• C) Reflection
• D) Refraction

Heat has the same units as:

• A) Temperature
• B) Work
• C) Heat capacity
• D) Energy/time

A solid of mass 2 kg is initially at its melting point. To completely melt the solid, how much heat is required, given the latent heat of fusion is 3.34×105 J/kg?

• A) 6.68 × 105 J
• B) 5.01 × 105 J
• C) 1.67 × 105 Js
• D) 3.34 × 105 J

In constructing a thermometer it is NECESSARY to use a substance that:

• A) Undergoes some change when heated or cooled
• B) Expands linearly with rising temperature
• C) Will not freeze
• D) Will not boil

During a process, a gas absorbs 150 J of heat and does 100 J of work. What is the change in the internal energy of gas?

• A) 150 J
• B) 100 J
• C) 250 J
• D) 50 J

Evidence that a gas consists mostly of empty space is the fact that:

• A) Gases are transparent
• B) Gases exert pressure on the walls of their containers
• C) Heating a gas increases the molecular motion
• D) The density of a gas becomes much greater when it is liquefied

The value of Wien’s constant is given as______.

• A) 2.9х10-5 mK
• B) 2.9х10-3 mK
• C) 2.9х10-3 K
• D) 2.9х10-5 K