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.

Room temperature is about 20 degrees on the:

• A) Kelvin scale
• B) Absolute scale
• C) Celsius scale
• D) Fahrenheit scale

If two objects are in thermal equilibrium with each other:

• A) They can not be undergoing an elastic collision
• B) They can not be moving
• C) They can not be at di?erent temperatures
• D) They can not have di?erent pressures

The equation for time dilation is given by:

• A) $$\Delta t = \sqrt \gamma {\text{ }}\Delta t'$$
• B) $$\Delta t' = \frac{{\Delta t}}{\gamma }$$
• C) $$\Delta t = \frac{{\Delta t'}}{\gamma }$$
• D) $$\Delta t' = \gamma {\text{ }}\Delta t$$

It is more di?cult to measure the coe?cient of volume expansion of a liquid than that of a solid because:

• A) No relation exists between linear and volume expansion coe?cients
• B) A liquid tends to evaporate
• C) A liquid expands too much when heated
• D) The containing evessel also xpands

Two sources of light are said to be coherent if the waves produced by them have the same:

• A) Amplitude
• B) Wavelength and constant phase difference
• C) Wavelength and amplitude
• D) Wavelength

In some movies, you sometimes see an actor looking in a mirror and you can see his face in the mirror. During the filming of this scene, what does the actor see in the mirror?

• A) The movie camera
• B) The director's face
• C) His face
• D) Your face

The temperature of the ice throughout the melting process when it is continuously heated by a small gas flame is:

• A) Remains constant initially and then increases.
• B) Increases until it turns into liquid water.
• C) Rises gradually.
• D) Remains constant.

When an object reflects or emits light equally across all wavelengths, it appear _____ to our eyes?

• A) Black
• B) Red
• C) Green
• D) White

Polarization of light is defined as:

• A) The process of light passing through a polar bear.
• B) The process of light aligning with Earth's magnetic field.
• C) The process of light vibrating in a specific direction.
• D) The process of light changing its color.