Physics - Modern Physics

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Question - 1

Consider the following statements

1.According to the de-Broglie hypothesis, particle have wave-like characteristics.

2.When an electron and proton have the same de-Broglie wavelength, they will have equal momentum.

Which of the statement(s) given above is/are correct?

  • A Only 1
  • B Only 2
  • C Both 1 and 2
  • D Neither 1 nor 2

Question - 2

What is the difference between Bluetooth and Wi-Fi devices?

  • A Bluetooth used 2.4 GHz radio frequency, band whereas Wi-Fi can use 2.4 GHz frequency band
  • B Bluetooth is used for wireless local area networks (WLAN) only.Whereas Wi-Fi is used for wireless wide area networks(WWAN) only
  • C When information is transmitted between two devices using Bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other.
  • D The statements (a) and (b) given above are correct in this context

Question - 3

In black and white Television, pictures on the screen and produces due to bombardment of

  • A X-rays photons on a white screen
  • B X-ray photons on a white fluorescent screen
  • C electrons on white screen
  • D electrons on a fluorescent white screen

Question - 4

The known forces of nature can be divided into four classes, viz, gravity, electromagnetism, weak nuclear force and strong nuclear force.With reference to them, which one of the following statements is not correct?

  • A Gravity is the strongest of the four
  • B Electromagnetism acts only on particles with an electric charge
  • C Weak nuclear force causes, radioactivity
  • D Strong nuclear force holds protons and neutrons inside the nucleus of an atom

Question - 5

Cure is a unit of

  • A energy of gamma rays
  • B half-life
  • C radioactivity
  • D intensity of gamma rays

Question - 6

Fusion reaction takes place at high temperature because

  • A nuclei break up at high temperature
  • B atoms are ionized at high temperature
  • C molecules break up at high temperature
  • D kinetic energy is high enough to overcome repulsion at high temperature

Question - 7

In nuclear reaction, there is conservation of

  • A energy only
  • B momentum only
  • C mass, energy and momentum
  • D mass only

Question - 8

In a nuclear reactor, cadmium rods are used to

  • A absorb neutrons
  • B produce neutrons
  • C slow down neutrons
  • D speed up neutrons

Question - 9

Rainbow is produced when sunlight falls on drops of rain.Which of the following physics phenomena are responsible for this?

1.Dispersion

2.Refraction

3.Internal reflection

Select the correct answer using the codes given below

  • A 1 and 2
  • B 2 and 3
  • C 1 and 3
  • D All of these

Question - 10

Long distance shortwave radio broadcasting uses

  • A direct wave
  • B sky wave
  • C ionospheric wave
  • D ground wave
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