Earth’s crust have the abundant reserves of _____.

1. 1. Silicon, nitrogen and aluminium
   2. Iron, Silicon and nitrogen
   3. Silicon, oxygen and aluminium
   4. Iron, silicon and oxygen

Which of the following is the most important ore of aluminium?

1. 1. Bauxite
   2. Haematite
   3. Limestone
   4. Bronze

Which of the following are the Rabi crops?

1. 1. Wheat, Barley, Mustard
   2. Wheat, Rice, Mustard
   3. Rice, Maize, Groundnut
   4. Barley, Mustard, Groundnut

An isotope of uranium employed as fuel is _____.

1. 1. U – 232
   2. U – 235
   3. U – 238
   4. U – 240

Bronze is an alloy of _____.

1. 1. Iron and Zinc
   2. Tin and Zinc
   3. Copper and Zinc
   4. Copper and Tin

The layer of atmosphere which affords protection to human beings against soar ultraviolet radiations is _____.

1. 1. Exosphere
   2. Stratosphere
   3. Ionosphere
   4. troposphere

Which of the following substances exhibit the property of sublimation?

1. 1. Camphor
   2. Ice
   3. Wax
   4. Ethyl alcohol

Oxidation results in _____.

1. 1. loss of protons
   2. gain of protons
   3. gain of electrons
   4. loss of electrons

Which of the following is not the colour in rainbow?

1. 1. Indigo
   2. Blue
   3. Black
   4. Violet

Which of the following is not a vitamin?

1. 1. Riboflavin
   2. Trypsin
   3. Ascorbic Acid
   4. Niacinamide