Important Questions of Electromagnetic Waves Physics | Zigya

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71.

Asserion: : NAND is a universal gate.

Reason: It can be used to describe all other logic gates.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


72.

Assertion: Magnetic Resonance Imaging (MRI) is a useful diagnostic tool for producing images of various parts of human body. 

Reason:  Protons of various tissues of human body play a role in MRI.

  • If both assertion and reason are true and reason is the correct explanation of the assertion

  • If both assertion and reason are true but reason is not the correct explanation of the assertion

  • If assertion is true, but reason is false

  • Both assertion and reason are false statements


73.

In case of linearly polarised light, the magnitude of the electric field vector

  • does not change with time

  • varies periodically with time

  • increases and decreases linearly with time

  • is parallel to the direction of propagation


74.

Assertion:  The true geographic north direction is found by using a compass needle.

Reason: The impurities meridian of the earth is along the axis of rotation of the earth.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


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75.

Assertion: There are very small sporadic changes in the period of rotation of the earth. 

Reason: Shi fling of large air masses in the earth's atmosphere produce a change in the moment of inertia of the earth causing its period of rotation to change.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


76.

The maximum distance upto which TV transmission from a TV of height h can be received is proportional to

  • h1/2

  • h

  • h3

  • h2


77.

In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer having electron density 1011 per  m3 ?

  • 2 MHz

  • 10 MHz

  • 12 MHz

  • 18 MHz


78.

X-ray beam are affected by

  • electric field

  • magnetic field

  • both (a) and (b)

  • none of these


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79.

All components of the electromagnetic spectrum in vacuum have the same

  • energy

  • velocity

  • wavelength

  • frequency


80.

The difference between soft and hard X-rays is of :

  • velocity

  • intensity

  • frequency

  • polarization


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