General knowledge Material- all Competitive

Which one of the following waves cannot be polarized
  1. radio waves
  2. X-rays
  3. transverse waves in a string
  4. longitudinal waves in a gas
A single phase 400V, 50Hz, motor takes a supply current of 100A at power factor of 0.701 lag. The motor power factor has been improved to 0.9 lagging by connecting a condenser in parallel. Calculate the capacity of the capacitor.
  1. 291 µF
  2. 2091 µF
  3. 2901 µF
  4. 2910 µF
Who is called the father of modern chemistry?
  1. AntonieLavoiser
  2. Chadwick
  3. J.J.Thompson
  4. Albert Einstein
In a chemical reaction, when one of the concentration of the reactant is in excess the order of the reaction is _________
  1. First order reaction
  2. second order reaction
  3. pseudo-first order
  4. All of these
The World Health Organization (WHO) is a specialised agency of the United Nations (UN) that is concerned with international public health. It is headquartered at
  1. Switzerland
  2. Sweden
  3. United Kingdom
  4. France
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