901. Which of the following is used as laughing gas?
A: Nitrogen Trioxide
B: Nitrogen Dioxide
C: Nitrous oxide
D: Nitrogen tetra oxide
902. Age of a tree can be determined by:
A: Keeping track of how many rings are in the stem
B: Counting the number of leaves
C: Counting the number of branches
D: Measuring the size of the tree
903. Panda is found in:
A: Nepal
B: Bhutan
C: India
D: China
904. Which blood group is known as the universal donor?
A: A-
B: 0+
C: O-
D: A+
905. Which group are the universal receivers?
A: B+
B: AB-
C: AB+
D: A-
906. In which of the following do red blood cells originate (or formed)?
A: Bone Marrow
B: Brain
C: Ligaments
D: Muscles
907. What is the normal lifespan of red blood cells?
A: 120 Days
B: 90 Days
C: 60 Days
D: 150 Days
908. The art of silkworm breeding is called?
A: Horticulture
B: Sericulture
C: Agriculture
D: All of the above
909. Fish breathe through which of the following?
A: Gills
B: Lungs
C: Fins
D: Kidney
910. First discovered metal by man is?
A: Copper
B: Gold
C: Bronze
D: None of the above
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