901. Summer sleep of animals is known as 
– aestivation. 

902. ‘The true sign of intelligence is not knowledge but imagination’ 
– Albert Einstein.

903. The temperature in the human body is controlled by 
– hypothalamus.

904. The temperature which shows the same measurement in Celsius and Fahrenheit scale is 
-40. 

905. The temperature which shows the same measurement in Fahrenheit and Kelvin scale is 
– 574.25. 

906. Temporary hardness of water is due to the presence of bicarbonates of calcium and 
– magnesium

907. Tetraethyl lead is used as anti¬ knocking agent in 
– petrol.

908. The 111 elements is named after Wilhelm 
– Conrad Rontgen. 

909. The acid present in soybeans is 
-phytic acid. 

910. The age of rocks from the moon has been estimated using the technique 
– Uranium dating

911. The area between polar circles and poles is 
– Frigid Zone.

912. The blood test that detects allergy to metals, chemicals and environmental toxins is 
– MELISA(Memory¬ Lymphocyte Immunostimulation Assay) test. 

913. The B-Programming language was developed by 
– Ken Thompson. 

914. The Burton Process is used to produce 
– Diesel. 

915. The chalk and blotting paper quickly absorbs ink, the brick quickly absorbs water etc. are due to 
– capillarity 

916. The chemical known as ‘Chinese White’ is 
– Zinc Oxide. 

917. The chemical substance used in blood bank is 
– monosodium citrate. 

918. The chemical used as a catalyst in the production of sulphuric acid is
– vanadium pentoxide. 

919. The chemical used to draw and write in the glasses is 
– hydrofluoric acid. 

920. The colour of a star indicates its
– temperature. 

921. The colour used in a scientific laboratory for indicating danger is
– yellow. 

922. The colour which appears on the lowest portion of a rainbow 
– Violet

923. The colour which appears on the upper portion of the rainbow 
– Red 

924. The compounds which cause the permanent hardness of water 
–  Sulphates and Chlorides of calcium and Magnesium 

– Tachycardia. 

926. The crop which absorbs ammonia directly is 
– paddy. 

927. The device used to measure the boiling point of a liquid is 
– Hypsometer.

928. The difference in time between two places 1° longitude apart is 
– 4 minutes. 

929. The disease known as Jail fever is
– Typhus. 

930. The dual nature of the electron was proposed by 
– Louis De Broglie