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  1. If a vector 2i+3j+8k is perpendicular to the vector 4j-4i+αk, then value of α is
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  3. The charges Q, +q, and +q are placed at the vartices of an equilateral
  4. Volume of gas becomes four times if temperature becomes
  5. The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.