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The correct answer is A
A cylindrical metal wire is reformed so that its length decreases by 20% with no change of volume. Its
resistance decreases by:
Which of the following pairs of vector and disease is/are correctly matched?
Vector Disease
Which component of food is the primary source of energy?
Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because
The surface temperature of the Sun is nearly -
Coffee, spinach, onion and tea in our diet mostly provide us with which of the following elements as food?
When a monochromatic light of frequency less than the threshold frequency is incident on a metal surface, which of the following occurs?
A car covers a distance of 200 km in 4 hours. What is its average speed ?
The phenomenon due to which the sky appears blue is
The arrangement of leaves on stems or its branches is