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⁞ Physics

General Science ➤ Physics ➤ 2
Question 16
Q16.  If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
 

Answer :  Concave


A concave mirror can form diminished as well as enlarged images, depending upon the distance of the object from the mirror. The image can be real and inverted or virtual and erect. While a convex mirror always forms a virtual, erect and diminished image, irrespective of the distance of the object from the mirror.
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Question 17
Q17.  The purpose of choke in a fluorescent lamp is__:
 

Answer :  to decrease the current flow


The choke primarily serves to limit current flow to the correct level for the tube. It also can be used during startup to provide an inductive ‘kick’ forming a momentary higher-voltage pulse to start the lamp.
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Question 18
Q18.  What is the direction of magnetic field lines in a magnet?
 

Answer :  North pole to South pole


Magnetic field lines or lines of force are the imaginary lines introduced by Michael Faraday (1791- 1867) to visualize magnetic field. Lines of force are graphical representation of a field. The lines of force are the path along which an isolated unit North Pole would move along in the field. A magnetic field line is directed from North Pole to South Pole outside the magnet and from south pole to north pole inside the magnet.
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Question 19
Q19.  Curie point is the temperature at which__:
 

Answer :  A metal loses magnetic properties.


The Curie temperature (Tc), or Curie point, is the temperature at which a ferromagnetic material becomes paramagnetic on heating; the effect is reversible. A magnet will lose its magnetism if heated above the Curie temperature. The paramagnetic are feebly magnetic in nature than ferromagnetic materials such as iron, cobalt and nickel.
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Question 20
Q20.  The component used for tuning a radio is basically a variable__:
 

Answer :  Condenser


A tuning capacitor or tuning condenser is a variable capacitor used in an electronic circuit of a radio. It usually confects in parallel to a loop antenna and its capacitance may be intentionally and repeatedly changed mechanically or electronically.
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