1.

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

2.

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

3.

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

4.

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

5.

Most stable carbocation is

6.

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

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