451.  If the temperature of a semiconductor rises, what is its resistivity?

452.  'mho' is the unit of which unit?

453.  In which type of climate does the temperature never rise above 10 ° C throughout the year?

454.  What is the product of the time period of a wave and its frequency?

455.  What is the name of the scientist who stated that matter can be converted into energy?

456.  What is the situation with increasing unemployment and inflation termed?

457.  The unidirectional property of a pn-junction is useful for its use as which thing?

458.  Who firstly demonstrated experimentally the existence of electromagnetic wave?

459.  Heating pyrites in air to remove sulphur is known as which name?

460.  Thermal decomposition of alkanes is known as which name?

461.  By which impact is Nuclear fission is caused?

462.  Comets revolve around which body?

463.  Which energy of the electron at absolute zero is called?

464.  Which layer of the earth is believed to have the heaviest mineral materials of highest density?

465.  When milk is churned, how does the cream separate from it?