AIPMT 2009 Preliminary Mock Test

Each of the two strings of length $51.6\text{cm}$ and $49.1\text{cm}$ are tensioned separately by $20\text{N}$ force. Mass per unit length of both the strings is same and equal to $1\text{g/m}$. When both the strings vibrate simultaneously, the number of beats is:

The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an:

The Figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

The Figure shows elliptical orbit of a planet $m$ about the sun $S$. The shaded area $SCD$ is twice the shaded area $SAB$. If $t_1$ is the time for the planet to move from $C$ to $D$ and $t_2$ is the time to move from $A$ to $B$ then:

A black body at $227^{\circ }\text{C}$ radiates heat at the rate of $7{\text{Cals/cm}}^2\text{s}$. At a temperature of $727^{\circ }\text{C}$, the rate of heat radiated in the same units will be: