3811: Which one of the following plants can fix nitrogen from air?
(a) Rice
(b) Wheat
(c) Pea
(d) Maize
3812: In the structure of planet Earth, below the mantle, the core is mainly made up of which one of the following?
(a) Aluminium
(b) Silicon
(c) Iron
(d) Chromium
3813: Disguised unemployment generally means
(a) large number of people remain unemployed
(b) alternative employment is not available
(c) marginal productivity of labour is zero
(d) productivity of workers is low
3814: Assertion (A):
According to statistics, more female children, are born each year than male children in India.
Reason (R):
In India, the death rate of a male child is higher than that of the female child.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
3815: What is the name of the vessel that delivers the nutrient rich blood from the stomach & small intestine to the liver ?
(a) Left hepatic artery
(b) Hepatic portal vein
(c) Right hepatic artery
(d) Hepatic vein