Match the following machines with their working principles:
(i) Electric motor - (a) Heat energy into mechanical energy
(ii) Steam engine - (b) Electric energy to light energy
(iii) Dynamo - (c) Electrical energy to mechanical energy
(iv)Electric Bulb - (d) Mechanical energy into electrical energy
Electric motor: Converts electrical energy to mechanical energy. Steam engine: Converts heat energy into mechanical energy. Dynamo: Converts mechanical energy into electrical energy. Electric bulb: Converts electrical energy into light energy.
Which one of the following is the cropping intensity if the total net cultivated area is 9.0 ha and the total cropped area is 18.0 ha?
The insects which have the capacity to survive through quite prolonged exposure to non – freezing low temperatures are known as _______:
Which of the following is not a variety of bajra:
Which of the following is a desirable characteristic of trees grown in Alley cropping?
Part of the cell wall of endodermal cells prevents water from moving into the cell is called
The physical basis of life is:
Which one of the following is used for brown manuring is rice?
The study of soil from the stand point of higher plants is known as ……………………….
The process of development of seed from anther is called:
Development of a diploid (2N) embryo from nuclear of integumentary tissue is
