Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
Sulphonates
Zeolites
Nitrates
None of these
- In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
- Which of the following parts of the sun is easily visible only during a total solar eclipse?
- Pollination by birds is called
- Which of the following is in liquid form at room temperature ?
- The fastest-running terrestrial animal is
- What is the unit for measuring the pitch or frequency of sound ?
- Epoxy resins is used as
- Apparatus invented by Archimedes is :
- The marine animal called dugong which is vulnerable to extinction is a/an
- Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of
- Water has maximum density at
- In an atomic nucleus, neutrons and protons are held together by
- Polythene is industrially prepared by the polymerisation of
- Bromine is
- The type of glass used in making prisms and lenses is
- The hardest substance available on earth is
- Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force?
- Lightening cause rainfall because
- The recent atomic weight scale is based on
- Liquefied Petroleum gas (LPG) consists of mainly
- The smallest functional and structural unit of kidney is called as
- Which of the following is commonly called a polyamide ?
- The accumulation of stress along the boundaries of lithospheric plates results in which of the following?
- The colour of Emerald is
- Quartz crystals normally used in quartz clocks etc. is chemically
- The intencity of Earthquakes is measured on
- Nitrification means
- The fastest acting enzyme in the biological kingdom is
- Earth's seasons are caused by which of the following?
- One fathom is equal to