1. In which of the following crop Azolla-Anabaena biofertilizer is used (A) Wheat (B) Rice (C) Mustard (D) Cotton 1-(B) 2. Which group of districts has highest forest area ? (A) Baran - Udaipur - Chittaurgarh (B) Bharatpur - Jhalawar - Kot…

1. The percentage of carbon is the least in — (A) Grey cast iron (B) Wrought iron (C) White cast iron (D) Steel 1 - (D) 2. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of — (A) Nitrates (B) Zeolites (C) Sulph…

1. In which of the following activities Silicon Carbide is used ? (A) Making cement and glass (B) Disinfecting water and ponds (C) Making castes for statues (D) Cutting very hard substances 1 - (D) 2. The element common to all acids is — (A) Oxygen (B)…

1. Washing soda is the common name of — (A) Calcium Carbonate (B) Calcium Bi-Carbonate (C) Sodium Carbonate (D) Sodium Bi-Carbonate 1(C) 2. The filament of electric bulb is made of — (A) Iron (B) Nichrome (C) Tungsten (D) Graphite 2(C) …