Which of the following are not electromagnetic waves?

  • A
    Cosmic rays
  • B
    $\gamma$-rays
  • C
    $\beta$-rays
  • D
    $X$-rays

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Which of the following contains both ionic and covalent bonds?

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Which of the following statements is correct?

Assertion $(A)$: Propagation of light through an optical fibre is due to total internal reflection taking place at the core-clad interface.
Reason $(R)$: Refractive index of the material of the core of the optical fibre is greater than that of air.

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