The meristematic tissue responsible for the increase in the girth of a tree trunk is:

Which of the substances $A, B$ or $C$ has the highest specific heat $?$ The temperature vs time graph is shown.

The perpendicular distance of the straight line $12x + 5y = 7$ from the origin is given by

In a Young's double-slit experiment,the fringe width is $0.2 \, mm$. If the wavelength of light used is increased by $10\%$ and the separation between the slits is also increased by $10\%$,the fringe width will be.......$mm$.

In a mass spectrometer used for measuring the masses of ions,the ions are initially accelerated by an electric potential $V$ and then made to describe semicircular paths of radius $R$ using a magnetic field $B$. If $V$ and $B$ are kept constant,the ratio $\left( \frac{\text{charge on the ion}}{\text{mass of the ion}} \right)$ will be proportional to

Let $n = 1! + 4! + 7! + \ldots + 400!$. Then the ten's digit of $n$ is