List of practice Questions

Displacement, $x$ (in meters), of a body of mass $1\,kg$ as a function of time, $t$, on a horizontal smooth surface is give as $x = 2t^2$. The work done in the first one second by the external force is
DNA strands are antiparallel because of the presence of
Which of the following is modification of leaf?
Match the following bacteria with diseases and choose the correct option.
A tree grows at the rate of 0-5 m per years. What will be the height of board fixed at 1-5 m above the base five years ago ?
Animals which have well developed echolocation system like that of bats are
If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature
Intercalary meristem occurs in
In Young?s double slit experimental setup, if the wavelength alone is doubled, the band width $\beta$ becomes
A bullet when fired into a target loses half of its velocity after penetrating $20\, cm$. Further distance of penetration before it comes to rest is
An engine pumps water continuously through a hose. Water leaves the hose with a velocity $v$ and $m$ is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?
Name the term used to describe a single non-dominant species that dictates community structure
A ball of mass $m$ is dropped from a height $h$ on a platform fixed at the top of a vertical spring, as shown in figure. The platform is depressed by a distance $x$. Then the spring constant is
The ratio of the intensities of two waves is 16 : 9. The ratio of their amplitudes is
When the temperature of a rod increases from t to t $+ \Delta t$ its moment of inertia increases from I to I + $\Delta I$ . If $\alpha$ be the coefficient of linear expansion of the rod, then the value of $\frac{\Delta I}{I}$ is
The $x-t$ plot shown in the figure below describes the motion of the particle, along $x-axis$, between two positions $A$ and $B$. The particle passes through two intermediate points $P_1$ and $P_2$ as shown in the figure
Two wires with currents $2\,A$ and $1\,A$ are enclosed in a circular loop. Another wire with current $3\, A$ is situated outside the loop as shown. Then $ \oint{\overrightarrow{B}}.\overrightarrow{dl} $ around the loop is
Two perfectly black spheres $A$ and $B$ having radii $8\,cm$ and $2\,cm$ are maintained at temperatures $127^{\circ}C$ and $527^{\circ}C$ respectively. The ratio of the energy radiated by $A$ to that by $B$ is
Persons who are colourblind cannot distinguish
In frequency modulation
Choose the correct sequence in the hierarchy of taxonomic categories in desending order
Which of the following is/are true ? I. Biowar - Biowar is the use of biological weapons against humans and or their crops and animals. II. Bioethics - Bioethics is the unauthorised use of bioresources and traditional knowledge related to bioresources for commercial benefi ts. III. Biopatent - Exploitation of bioresources of other nations without proper authorization
Which one of the following is correctly paired ?
Which one of the following is not a characteristic feature of the subphylum Vertebrata ?
The solution set of the in equation $ \frac{x+11}{x-3}>0 $ is