1.

How many $ 1\,\mu F $ capacitors must be connected in parallel to store a charge of $1\, C$ with a potential of $110\, V$ across the capacitors?

• 990
• 900
• 9090
• 909

2.

Which one of the following alkylbromides undergoes most rapid solvolysis in methanol solution to give corresponding methyl ether?

3.

Sigmoid growth curve is represented by

• $ dN/dt=rN $
• $ dN/dt=rN\,\,(1-N/K) $
• $ Nt/No +B +I-D-E $
• $ dN/dt=1-N/K $

4.

Which of the following graphs shows the variation of acceleration due to gravity $g$ with depth $h$ from the surface of the earth?

5.

Most stable carbocation is

6.

A hammer of mass $200\, kg$ strikes a steel block of mass $200\, g$ with a velocity $8\, ms^{-1}$. If $23\%$ of the energy is utilized to heat the steel block, the rise in temperature of the block is (specific heat capacity of steel = $460 \; J \; kg^{-1} \; K^{-1}$)

• 8 K
• 16 K
• 12 K
• 24 K