1. The tree which sends down roots from its branches to the soil is known as:
a) Oak
b) Pine
c) Banyan
d) Palm
Explanation: The tree which sends down roots from its branches to the soil is known as banyan tree.
2. Electric bulb filament is made of
a) Copper
b) Aluminum
c) Lead
d) Tungsten
Explanation: Electric bulb filament is made of tungsten.
3. Brass gets discoloured in air because of the presence of which of the following gases in air?
a) Oxygen
b) Hydrogen Sulphide
c) Carbon dioxide
d) Nitrogen
Explanation: Brass gets discolored in air because of the presence of Hydrogen sulphide
4. Which of the following is a non metal that remains liquid at room temperature?
a) Phosphorous
b) Bromine
c) Chlorine
d) Helium
Explanation: Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.
5. Chlorophyll is a naturally occurring chelate compound in which central metal is
a) Copper
b) Magnesium
c) iron
d) Calcium
Explanation: One such chelate is chlorophyll, the green pigment of plants. In chlorophyll the central ion is magnesium, and the large organic molecule is a porphyrin. The porphyrin contains four nitrogen atoms that form bonds to magnesium in a square planar arrangement.
6. The group of metals Fe, Co, Ni may best called as:
a) Transition metals
b) Main group metals
c) Alkali metals
d) Rare metals
Explanation: The group of metals Fe, Co, Ni may best called as transition metals.
7. Heavy water is:
a) Deuterium oxide
b) PH7
c) Rain water
d) Tritium oxide
Explanation: Heavy water is a form of water that contains only deuterium rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
8. The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
a) Bromine
b) Fluorine
c) Chlorine
d) Sulphur
Explanation: The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of sulphur.
9. The element common to all acids is.
a) Hydrogen
b) Carbon
c) Sulphur
d) Oxygen
Explanation: Hydrogen is the common element in all acids.
10. Non stick cooking utensils are coated with
a) Black paint
b) PVC
c) Teflon
d) polystyrene
Explanation: Most nonstick pans are coated with polytetrafluoroethylene, also known as Teflon.