An erect object is in front of a convex mirror a distance greater than the focal length. The image is:

• A) Real, inverted, and larger than the object
• B) Virtual, erect, and smaller than the object
• C) Real, inverted, and smaller than the object
• D) Virtual, inverted, and larger than the object

According to special relativity, the speed of light is:

• A) Infinite
• B) Variable based on the observer's motion
• C) Always constant
• D) Zero

In Young’s double slit experiment, the position of the bright fringe is given by:

• A) Ym = mλd/L
• B) Ym = mLd/λ
• C) Ym = mL/λd
• D) Ym = mLλ/d

When an object (iron/tungsten) is heated, it emits light. It emits infrared (IR) light when it is heated at a temperature __________.

• A) above 2500 degree C
• B) Between 800 degree C to 1600 degree C
• C) Between 1600 degree C to 2500 degree C
• D) Below 800 degree C

Emission of electron by metals on heating is called:

• A) Compton emission
• B) Photoelectric emission
• C) Secondary emission
• D) Thermionic emission

A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called:

• A) Ideal gas
• B) Inert gas
• C) Real gas
• D) Simple gas

Evidence that molecules of a gas are in constant motion is:

• A) Two gases interdi?use quickly
• B) Gases area easily compressed
• C) Warm air rises
• D) Winds exert pressure

What happens if a point source is placed at the focus of a convex lens?

• A) Rays reflect back
• B) Rays scatter
• C) Parallel beam emerges
• D) Rays converge to a point

Net change in entropy of a system in a Carnot cycle is:

• A) Zero
• B) Negative
• C) One
• D) Positive

A thermometer indicates 98.6?C.It may be:

• A) In a cup of hot tea
• B) Outdoors on ac old day
• C) In a normal person’s mouth
• D) In a comfortable room

Which of the following is NOT TRUE about index of refraction?

• A) Its value ranges from 0.1 – 1.9
• B) For glass its value is 1.5
• C) It has no units
• D) It is a ratio between speeds

Based on statistical mechanics, entropy of a system is defined as:

• A) The degree of randomness
• B) The degree of molecular attraction
• C) The degree of temperature
• D) The degree of order

In everyday life the effect of diffraction is more significant for sound than for light because that:

• A) Light has a much longer wavelength than sound.
• B) Insufficient Information.
• C) Light has a much shorter wavelength than sound.
• D) Light has a much shorter frequency than sound.

The units of the Planck constant h are those of:

• A) Energy
• B) Frequency
• C) Angular momentum
• D) Momentum

For what purpose would a concave mirror be particularly useful, given its ability to produce virtual images that are smaller?

• A) Rear-view mirrors in cars
• B) Magnifying glasses
• C) Shaving mirrors
• D) Astronomy telescopes

Which of the following does not show any interference pattern?

• A) A thick film
• B) Excessively thin film
• C) A wedged-shaped film
• D) Soap bubble

No entropy change is associated with:

• A) Isobaric process
• B) Isothermal process
• C) Remains constant
• D) Adiabatic process

What happens to the speed of light when it passes from a rare medium to a denser medium?

• A) It becomes zero
• B) It remains the same
• C) It increases
• D) It decreases

Coherent sources of light mean ______________.

• A) They must have same frequency
• B) They must have same amplitude
• C) They must have fixed phase relative to each other
• D) They must have same speeds

Aging process of the human body:

• A) Becomes fast at very high speed
• B) Remains constant
• C) Becomes slow by motion at very high speed
• D) None of these