AIPMT 2009 Preliminary Mock Test

A p-n photodiode is fabricated from a semiconductor with a band gap of $2.5\text{eV}$. It can detect a signal of wavelength:

If the dimensions of a physical quantity are given by $M^a{L}^b{T}^c$, then the physical quantity will be:

A transistor is operated in common-emitter configuration at $V_c=2\text{V}$ such that a change in the base current from $100\mu \text{A}$ to $200\mu \text{A}$ produces a change in the collector current from $5\text{mA}$ to $10\text{mA}$. The current gain is:

The mass of a lift is $2000\text{kg}$. When the tension in the supporting cable is $28000\text{N}$, then its acceleration is:

Four identical thin rods each of mass $M$ and length $l$, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is: