DU 'Ka' Admission Test 2009-2010

1. Which region of atmosphere does contain ozone layer?

2. For the boys, the task was quite easy,_________?

3. The angle of minimum deviation of a prism is $30^{\circ}$. If the refractive angle of the prism is $60^{\circ}$ what is its refractive index?

4. The sum of $n$ terms of the series $1.2 .3+2.3 .4+3.4 .5+\ldots \ldots$ is -

5. If $\vec{P}=2 \hat{i}+4 \hat{j}-5 \hat{k}$ and $\vec{Q}=\hat{i}+2 \hat{j}+3 \hat{k}$ then the angle between them is-