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Q:

Optical fiber works on the principle of -

A) Diffusion B) Total Internal Reflection
C) Scattering D) Refraction
 
Answer & Explanation Answer: B) Total Internal Reflection

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Q:

A galvanometer can be converted into a voltmeter by connecting with it a

A) high resistance in parallel B) low resistance on parallel
C) high resistance on series D) low resistance in series
 
Answer & Explanation Answer: C) high resistance on series

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Q:

When we see an object, the image formed on the retina is ________

A) Real and inverted B) Real and erect
C) Virtual and erect D) Virtual and inverted
 
Answer & Explanation Answer: A) Real and inverted

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Q:

With reference to gravity, what is G called?

A) Gravitational constant B) Gravitational attraction
C) Gravitational force D) Acceleration due to gravity
 
Answer & Explanation Answer: A) Gravitational constant

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Q:

A broadcasting station transmits waves with a frequency of 71 x 104 Hz and a speed of 3 x 108 m/s. The wavelength of the wave is

A) 324.6 m B) 422.5 m
C) 208.4 m D) 418.8 m
 
Answer & Explanation Answer: B) 422.5 m

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Q:

Choose the most appropriate answer:In which atmospheric layer are the communication satellites located?

A) Stratosphere B) Ionosphere
C) Troposphere D) Mesosphere
 
Answer & Explanation Answer: B) Ionosphere

Explanation:

The communication satellites are located in Ionosphere.

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Q:

Terminal velocity ________.

A) first increases before decreasing B) is constant
C) first decreases before increasing D) always keeps on increasing
 
Answer & Explanation Answer: B) is constant

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Q:

A  photon  of  X-ray  has  energy  of  1  keV.  A photon of visible radiation has energy of 3 eV.  In  this  context,  which  one  of  the following statements is not correct?

A) The wavelength of X-ray photon is less than the wavelength of visible radiation photon. B) Both    the    photons    have    different energies.
C) The  speeds  of  both  the  photons  in vacuum are different D) The   frequency   of   X-ray   photon   is higher  than  the  frequency  of  visible radiation photon.
 
Answer & Explanation Answer: C) The  speeds  of  both  the  photons  in vacuum are different

Explanation:

The speed of all the electromagnetic radiation are always   same   and   equal   to   the numerical value 3 x 10^8m/sec.

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