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Physics Test 21
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Physics Test 21
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  • Question 1/10
    1 / -0
    The device in communication satellite which receives signals from an earth station and transmits them to different directions is
    Solutions
    In telecommunication, a transponder is one of two types of devices. In air navigation or radio frequency identification, a flight transponder is a device that emits an identifying signal in response to an interrogating received signal. In a communications satellite, a transponder gathers signals over a range of uplink frequencies and re-transmits them on a different set of downlink frequencies to receivers on Earth, often without changing the content of the received signal or signals.
  • Question 2/10
    1 / -0
    A concave lens always forms an image which is ____.
    Solutions
    • Concave lenses are thinner at the middle. Rays of light that pass through the lens are spread out. A convex lens is a diverging lens.
    • When parallel rays of light pass through a concave lens the refracted rays diverge so that they appear to come from one point called the principal focus.
    • The distance between the principal focus and the centre of the lens is called the focal length.
    • The image formed is virtual, erect and diminished (smaller).
  • Question 3/10
    1 / -0
    ‘Farad’ is the unit of :
    Solutions
    Farad is the unit of Capacitance.
    Other Important units to learn :

    Quantity Units (S.I.)
    Viscosity Poise
    Surface tension Newton/metre
    Heat Joule
    Temperature Kelvin
    Absolute temperature Kelvin
    Resistance Ohm
    Electric current Ampere
    Electromotive force Volt
    Electric energy Kilo watt hour
    Electric power Kilo watt or watt
  • Question 4/10
    1 / -0
    Photon is the fundamental unit/quantum of
    Solutions
    Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum. The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight. Visible light is usually defined as having wavelengths in the range of 400–700 nanometers or 400×10−9 m to 700×10−9 m, between the infrared and the ultraviolet.
  • Question 5/10
    1 / -0
    The two specific heats of gases are related by_______.
    Solutions
    • The specific heats of gases are given as Cp and Cv at constant pressure and constant volume respectively while solids and liquids are having only single value for specific heat.
    • Cp - CV = R 
  • Question 6/10
    1 / -0
    Burns caused by steam are more severe than caused by boiling water because _______.
    Solutions
    • Steam will produce more severe burns than boiling water because steam has more heat energy than water due to its latent heat of vaporisation.
  • Question 7/10
    1 / -0

    The apparent weight of a man in a lift is less than the real weight when______

    Solutions

    • The apparent weight of a man in a lift is less than the real weight when the lift is going down with an acceleration.

    • The lift falls freely under gravity. The man also falls freely under gravity that's why the man feels that he has lost his weight.
  • Question 8/10
    1 / -0
    It is easy to burst a gas-filled balloon with a needle than with a nail. It is because______.
    Solutions
    It is easy to burst a gas-filled balloon with a needle than with a nail. It is because needle exerts more pressure than nail on the balloon.
  • Question 9/10
    1 / -0
    Electric current is measured using which of the following instrument?
    Solutions
    • An ammeter is a measuring instrument used to measure the current in a circuit.
    • A picoammeter measures very low electric current.
  • Question 10/10
    1 / -0
    Ice is packed in sawdust because ___________.
    Solutions
    • Sawdust acts as an insulator against the surrounding temperatures and helps maintain the low temperatures of ice, so ice is packed in sawdust always or sometimes in layers of sackcloth.
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