List of top Questions asked in DUET- 2006

Which of the following does not effect half-life of first order reaction?

Which of the following is true for rays coming from infinity?

A galvanometer has a resistance of 50$\Omega$. If a resistance of 1$\Omega$ is connected across its terminals, the total current flow through the galvanometer is [$I_g$ represents the maximum current that can be passed through the galvanometer]

A network of four capacitors of capacity equal to $C_{1}=C, C_{2}=2 C, C_{3}=3 C$ and $C_{4}=4 C$ are connected to a battery as shown in the figure. The ratio of the charges on $C_{2}$ and $C_{4}$ is.:

Two identical springs are connected in series and parallel as shown in the figure. If $ f_{s} $ and $ f_{p} $ are frequency of series and parallel arrangement what is $ \frac{f_{s}}{f_{p}} $ ?

What is dimensional formula of thermal conductivity?

Two copper wires of length $ l $ and $2 l $ have radii $r$ and $2r$ respectively. What is the ratio of their specific resistances?

Toluene by Etard reaction gives:

At high pressure van der Waals equation becomes :

Reactivity order of following towards $ NaOE,\,EtOH $ :

Number of atoms in bcc :

Principle of $H$-bomb is:

$R - \underset{\overset{||}{O}}{C} - Cl + H_2 {->[Pd/BaSO_4][S]} RCHO$, the name of reaction is :

Starch is converted to ethanol by fermentation. The sequence of enzymes used are

Which has equilibrium constant as one?

How many ions will be furnished by $ CoCl_{3}\,.\,\,6NH_{3} $ ?

The volume of a cube in $ m^3 $ is equal to the surface area of the cube in $m^2$. The volume of the cube is