A calorie is about:

• A) 4.2J
• B) 250J
• C) 8.3J
• D) 4200J

If white light is used instead of monochromatic light for light interference, what would be the change in the observation?

• A) The shape of the pattern will change from hyperbolic to circular.
• B) Colored fringes will be observed, with a bright fringe at the center.
• C) The bright and dark fringes will change position
• D) The pattern will not be visible.

If 500 J of heat is added to a substance and its temperature increases by 5°C, what is its heat capacity?

• A) 100 J/°C
• B) 105 J/°C
• C) 505 J/°C
• D) 500 J/°C

In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to:

• A) the energy of the least energetic electron after it is ejected
• B) the energy of the least energetic electron before it is ejected
• C) the energy of the most energetic electron before it is ejected
• D) the energy of the most energetic electron after it is ejected

The point where parallel rays converge after reflecting off a convex mirror is called

• A) Apex
• B) Center
• C) Vertex
• D) Focus

If a gas expands into a vacuum, work done by the gas is:

• A) Zero
• B) Equal to the internal energy change
• C) Positive
• D) Negative

Time:

• A) Is continuous
• B) Is static
• C) Is relative
• D) Is an absolute quantity

A certain electromagnetic wave has a frequency of 6×1014 Hz. What is the wavelength of this wave?

• A) 600 meters
• B) 300 nanometers
• C) 6×10−7 meters
• D) 5×10−7 meters

If a phosphorescent material and a fluorescent material are exposed to the same source of light and then observed in the dark, which one will continue to emit light?

• A) The fluorescent material.
• B) Neither material would emit light.
• C) The phosphorescent material.
• D) Both materials equally.

A convex mirror has a radius of curvature R of 26 cm. What is its focal length f?

• A) 40 cm
• B) 13 cm
• C) 52 cm
• D) 10 cm

For an ideal gas at constant pressure, how is the volume related to temperature?

• A) Volume is directly proportional to temperature.
• B) Volume remains constant irrespective of temperature.
• C) Volume is proportional to the square of temperature.
• D) Volume is inversely proportional to temperature.

What is the primary application of polarized sunglasses?

• A) To increase the intensity of light
• B) To reduce glare from surfaces like water and snow
• C) To enhance colors in the environment
• D) To make objects appear larger

What is time dilation?

• A) Compression of time
• B) Expansion of time
• C) Stationary time
• D) Time reversal

Which of the following statement is true regarding time dilation?

• A) It is constant for every object
• B) It has been experimentally verified
• C) It is a purely theoretical concept
• D) It is a myth

Identify the principle behind the sparkling of diamonds.

• A) Reflection
• B) Interference
• C) Refraction
• D) Total internal reflection

The wavelength of light beam A is twice the wavelength of light beam B. The energy of a photon in beam A is:

• A) equal to the energy of a photon in beam B
• B) one-fourth the energy of a photon in beam B
• C) half the energy of a photon in beam B
• D) twice the energy of a photon in beam B

A concave lens has a focal length of -8 cm. What does the negative sign indicate about the lens?

• A) The lens is converging.
• B) The lens is perfect.
• C) The lens is diverging.
• D) The lens has a defect.

How does the anomalous behaviour of water benefit fish in the winter?

• A) It ensures the entire lake remains liquid.
• B) It allows the bottom of lakes to remain unfrozen.
• C) It facilitates faster fish movement.
• D) It creates a warmer environment at the surface.

Polarization means ___________________________.

• A) To separate the light into its colors
• B) To guide the light in only one direction
• C) To change the frequency of the light
• D) To alter the wavelength of the light

In an electromagnetic waves, the electric and magnetic fields are oriented:

• A) Parallel to the direction of propagation.
• B) Perpendicular to each other and to the direction of propagation.
• C) In the same direction.
• D) Oscillate randomly in space.