1.

What is the shape and magnetic nature of permanganate ion ?

• Pyramidal diamagnetic
• Tetrahedral, diamagnetic
• Tetrahedral, paramagnetic
• Planar, paramagnetic

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.

Taxonomic hierarchy refers to

• stepwise arrangement of all tegories for classification of plants and animal
• a group of senior taxonomists who decide the nomenclature of plants and animals
• a list of botanists or zoologists who have worked on taxonomy of a species or group
• classification of a species based on fossil record

4.

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 $

5.

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

6.

Most stable carbocation is