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Consider the following statements : At the present level of technology available in India, solar energy can be conveniently used to
I. supply hot water to residential buildings.
II. supply water for minor irrigation projects.
III. provide street lighting.
IV. electrify a cluster of villages and small towns. Of these statements

Assertion (A): Transformer is useful for stepping up or stepping down voltages. Reason (R): Transformer is a device used in D.C. circuits. In the context of the above two statements, which one of the following is correct ?

The variation of displacement [d] with time [t] in the case of a particle falling freely under gravity from rest is correctly

Total internal reflection can take place when light travels from

When a mirror is rotated by an angle of 6, the reflected ray will rotate by

A liquid is flowing in a streamlined manner through a cylindrical pipe. Along a section containing the axis of the pipe, the flow profile will be

A truck, a car and a motor cycle have equal kinetic energies. If equal stopping

Besides proteins and carbohydrates, other elements of nutritional value found in milk include

When an air bubble at the bottom of a lake rises to the top, it will

Distance-time graph in respect of a race among four persons is shown in the given figure. Consider the following statements in this regard : I. ‘A’ stood first in the race. II. ‘C led all the way. III. ‘D’ ran faster than others in the later part of the race. Of these statements