Physical World ...

Nano science is the study of fundamental principles that nature permits at the nanoscale or less than that $$i e . . . . . . . . . . . .$$ 

Which of these is incorrect about nuclear forces ?

Which of the following is not a research purpose?

If the doors of a refrigerator are left open for a few hours, the room temperature will?

$$Fg,Fe$$ and $$Fn$$ represent the gravitational, electromagnetic and nuclear forces respectively, then arrange them in increasing order of their strengths

"The three most important inventions of this century are the nuclear bomb, the high yield hybrid speed, and the computer". Can you name the person who made this statement?

In the given figure $$Y$$, magnet $$P$$ is experiencing ____
(1) Magnetic force of repulsion  (2) Magnetic force of attraction
(3) Elastic spring force (4) Gravity

Choose the wrong statement :

When a vander waal's gas undergoes free expansion then its temperature

Sampling allows survey of large populations using questionnaires interviews provide in depth responses is called