In the environment,ozone is known for its

In the Davisson and Germer experiment,the velocity of electrons emitted from the electron gun can be increased by

Spraying of $D.D.T.$ on crops produces pollution of

$300 \, g$ of water at $25^{\circ} C$ is added to $100 \, g$ of ice at $0^{\circ} C$. The final temperature of the mixture is ........... $^{\circ} C$.

$A$ charge $Q$ is divided into two charges $q$ and $Q-q$. The value of $q$ such that the force between them is maximum,is

Which of the following is a fiber-yielding plant?