BUET Admission Test 2006-2007

1. Determine the equation of directrix of a parabola having the epicenter of $(3,4)$ and vertex at $(0,0)$.

2. In case of hydrogen atom for which of the spectrums below there is visible light?

3. If the temperature of a black body increases from $27^{\circ} \mathrm{C}$ to $327^{\circ} \mathrm{C}$ then the radiation of heat increases by -

4. The internal electric intensity of a capacitor is $\vec{E}$. If a charge $q$ is passed along the way $P Q R S$ as in the figure then what is the work done?

5. If $x=a(\theta-\sin \theta)$ and $y=a(1+\cos \theta)$, then the value of $\frac{d y}{d x}$ is: