The reciprocal of a negative number is always a negative number. So that the number and its reciprocal multiply to 1.    All real numbers except 0 have reciprocals.

Mercury was the remedy of choice for syphilis in Protestant Europe. Until the early 20th century, the primary treatment for syphilis was mercury, in the form of calomel, ointments, steam baths, pills, and other concoctions. Mercury was already being used in Western Europe to treat skin diseases.

Answer: B) a surface exposed by a retreating glacier Explanation:

Answer: D) All the above Explanation: Common properties of Minerals are :   1. All minerals are formed in a natural process. 2. Minerals are inorganic 3. Minerals are crystalline solids. 4. Every mineral is an element or compound with a definite chemical composition.

An English word with five letters in which if you remove the last four letters, still pronounced the same is QUEUE.

Answer: B) Pyranometer Explanation: Solar radiation instruments may be produced to measure different types of solar energy. When sunlight encounters the Earth's atmosphere, some of it is absorbed or scattered by water vapor, aerosols, clouds, and other air molecules. The radiation which penetrates to the Earth's surface is termed direct solar radiation.   A thermopile pyranometer is a type of actinometer used for measuring solar radiation on a planar surface and it is designed to measure the solar radiation flux density (W/m2) from the hemisphere above within a wavelength range 0.3 μm to 3 μm.

Answer: D) 90% Explanation:

Answer: A) Gown Explanation: A Christian Priest wears cassock while a Graduate wears gown.   Hence, Cassock : Priest :: Gown : Graduate.