1.

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

2.

The mobility of charge carriers increases with

• increase in the average collision time
• increase in the electric field
• increase in the mass of the charge carriers
• decrease in the charge of the mobile carriers

3.

Which of the following statements is wrong?

• Pollen grains remain viable for several months because their outer covering is made of sporopollenin
• No enzyme can degrade sporopollenin
• Pollen grains are well represented in fossil strata due to sporopollenin
• Pollen wall has cavities containing proteins

4.

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

5.

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} $

6.

Which will undergo fastest $82$ substitution reaction when treated with $NaOH$?

• $H_5C_2 - \underset{\overset{|}{H}}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $CH_3 - \underset{\overset{|}{C}H_3}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $H - \underset{\overset{|}{C_2}H_5}{\overset{\underset{|}{C}H_3}{C}} - Br$
• $H - \underset{\overset{|}{Br}}{\overset{\underset{|}{H}}{C}} - CH_2 - CH_2 - CH_3$