Friday, July 25, 2014

Physics Quiz for SSC Exams with Explanation

Physics Quiz

  • 1. The splitting of different colours of light in Prism is

    1. Reflection of Light
    2. Dispersion of Light
    3. Diffraction of Light
    4. Refraction of Light
    Answer And Explanation
    Answer: Option B
    Explanation:
    Note:The refractive index of many materials such as glass varies with the wavelength or color of the light used, a phenomenon known as Dispersion. This causes light of different colors to be refracted differently and to leave the prism at different angles creating an effect similar to a rainbow. In Optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency or alternatively when the group velocity depends on frequency. Media having such a property are termed dispersive media.

Physics Quiz

  • 2. A boat will submerge when it displace water equal to its own

    1. Weight 
    2. Volume 
    3. Surface Area
    4. Density
    Answer And Explanation
    Answer: Option B
    Explanation:
    Note: A boat will float when the weight of the water it displaces equals the weight of the boat and anything will float if it is shaped to displace its own weight water before it reaches the point where it will submerge. Floating of the boat works on the principle of buoyancy force which is an upward force exerted by a liquid, gas or other fluid or an object submerged in the fluid, experiences greater pressure at the bottom of the column than at the top. Thus difference in pressure results in a net force that tends to accelerate an object upward.

Physics Quiz

  • 3. Surface Tension in a liquid is due to:

    1. Adhesive force between molecules
    2. Cohesive force between molecules
    3. Gravitation force between molecules
    4. Electrical force between molecules
    Answer And Explanation
    Answer: Option B
    Explanation:
    Note: Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. This property is cause by cohesion of similar molecules and is responsible for many of the behaviors of liquids. It is revealed. For example- in floating of some objects on the surface of water even through they are denser than water and in the ability of some insects i.e.g water strider to run on the water surface. 

Physics Quiz

  • 4.A circular plate, a cube and a sphere, all made up of same material and having the same mass are heated to 300 degree celsius and left in a room. Which of them will have the slowest rate of cooling.

    1. Circular Plate
    2. Cube
    3. Sphere
    4. All will cool at the same rate
    Answer And Explanation
    Answer: Option C
    Explanation:
    Note:Sphere will show the slowest rate of cooling

Physics Quiz

  • 5.Optical Fibres are used in:

    1. CAT Scan
    2. X-Ray photos
    3. Ultrasound Scans
    4. Endoscopy
    Answer And Explanation
    Answer: Option D
    Explanation:
    Note: Optical fibres are used in endoscopic instruments that enable doctors to view internal body parts without having to perform surgery. Fernando Alves Martins of Portugal invented the first fiber optic endoscope in 1963-64. 

Physics Quiz

  • 6.The snow of the mountains does not melt all at once when it is heated by the sun because 

    1. It becomes very hard
    2. It reflects most of the heat from the sun
    3. It has low specific heat capacity
    4. It has a high latent heat of fusion
    Answer And Explanation
    Answer: Option B
    Explanation:
    Note: Newly formed snow reflects about 90 percent of the sunlight that falls upon it. This means that the sun is powerless to melt clean snow. And when snow does melt, it is not because of the sunlight.  It's due to the warm air from the sea.

Physics Quiz

  • 7. Holography is a technique of 

    1. recording a permanent, sharp two dimensional black and white or multicolour photograph.
    2. recording a permanent three dimensional multicolor photograph
    3. recording a permanent three dimensional black and white photograph
    4. recording a permanent three dimensional photograph of a given single colour or a multicolour
    Answer And Explanation
    Answer: Option D
    Explanation:
    Note: Holography is a technique which enables three dimensional images to be made. It involves the use of a laser, interference, diffraction, light intensity recording and suitable illumination of the recording. The image changes as the position and orientation of the viewing system changes in exactly the same way as if the object were still present, thus making the image appear three-dimensional.

Physics Quiz

  • 8. Boyle's Law holds good for any gas at

    1. High Temperature and Low Pressure
    2. High Temperature and High Pressure
    3. Low Temperature and High Pressure
    4. Low Temperature and Low Pressure
    Answer And Explanation
    Answer: Option C
    Explanation:
    Note:At higher pressures and lower temperatures, deviation from the ideal gas behavior became noticeable , and the relationship between pressure and volume can only be accurately described employing real gas theory. Boyle's law sometimes referred to as the Boyle-Mariotte law states that the absolute pressure and volume of a given mass of confined gas are inversely proportional, if the temperature remains unchanged within a closed system.

Physics Quiz

Physics Quiz

  • 10. The velocity of heat radiation in vacuum is

    1. Equal to that of light
    2. Less than that of light
    3. Greater than that of light
    4. Equal to that of sound
    Answer And Explanation
    Answer: Option A
    Explanation:
    Note: Electrones are generally responsible for heat conduction. The phonons(vibration of nucleus) also play a part, depending on the temperature of the medium. It depends on the specific conductor you re using.

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