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 basic unit of study in Ecology is

• population
• organism
• community
• species

3.

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

4.

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

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.

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