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.

In the given structure of a compound, the correct various bond moments direction involving are shown as

• $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\leftarrow }CH_{2}\underline{\leftarrow }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\leftarrow }SiH_{2}\to CH_{2}\underline{\to }O\underline{\leftarrow }CH_{3} $
• $ Br\underline{\leftarrow }N\underline{\to }CH_{2}\underline{\to }SiH_{2}\underline{\leftarrow }CH_{2}\underline{\to }O\underline{\to }CH_{3} $

3.

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

4.

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

5.

The basic unit of study in Ecology is

• population
• organism
• community
• species

6.

During the phenomenon of resonance

• the amplitude of oscillation becomes large
• the frequency of oscillation becomes large
• the time period of oscillation becomes large
• All of the above