List of practice Questions

Conversion of benzene to acetophenone can be brought by
A truck accelerates from speed $\upsilon \,to\, 2\upsilon$. Work done in during this is
A radioactive substance emits $100$ beta particles in the first $2$ seconds and $50$ beta particles in the next $2$ seconds. The mean life of the sample is
Intramolecular Hydrogen bonding is formed in
Excess of $PCl_5$ reacts with conc. $H_2SO_4$ giving
The opening and closing of stomata are controlled by the activity of
Wiich one of the following does not belong to kingdom-Monera?
The branch of biology that deals with the study of fossil is
Radii of curvature of a converging lens are in the ratio $1 : 2$. Its focal length is $6 \,cm$ and refractive index is $1.5$. Then its radii of curvature are
A series combination of resistor $(R)$ and capacitor $(C)$ is connected to an $AC$ source of angular frequency $'\omega'$. Keeping the voltage same, if the frequency is changed to $\frac{\omega}{3}$ , the current becomes half of the original current. Then the ratio of the capacitive reactance and resistance at the former frequency is
The wavelength $\lambda_e$ of an electron and $\lambda_P$ of a photon of same energy E are related by:
When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration $3a_0$ towards west. The electric and magnetic fields in the room are:
Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1m, 2m, 4m, 8m, ...., respectively, from the origin. The resulting gravitational potential due to this system at the origin will be
An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass $1\, kg$ moves with a speed of $12 \, ms^{-1}$ and the second part of mass $2 \,kg$ moves with $8 \, ms^{-1}$ speed. If the third part files off with $4 \, ms^{-1}$ speed, then its mass is :
The heart is pumping blood at x kg per unit time, with a constant velocity v. The force required is
$ Ca{{(HC{{O}_{3}})}_{2}}(s) $ decomposes as $ Ca{{(HC{{O}_{3}})}_{2}}(s)\xrightarrow[{}]{{}}CaC{{O}_{3}}(s)+{{H}_{2}}O(g) $ $ +C{{O}_{2}}(g) $ Total pressure at equilibrium is found to be 0.12 bar. Thus, $ {{K}_{p}} $ is
The transverse displacement of a string fixed at both ends is given by $y=0.6 \sin \left(\frac{2 \pi x}{3}\right) \cos (120 \pi t)$ where $x$ and $y$ are in metres and $t$ is in seconds. The length of the string is $1.5\, m$ and its mass is $3.0 \times 10^{-2} kg$. The tension in the string is equal to
Specific redioactive identification of ribosomal RNA can be achieved by using $ ^{14}C $ labelled
Which one pair/ set exhibit uricotelism?
The biggest producer of diamond in the world is:
National Commission for Protection of Child Rights (NCPCR) is the statutory body that monitors the implementation of the Act across the country. Who among the following is the current chairman of NCPCR?
One recipient of the Swedish Right Livelihood Award 2012 belongs to Afghanistan. Name that recipient:
Which of the following countries in the world is the biggest consumer of gold?
K.N. Tilak Kumar is the current president of:
Senkaku Islands is disputed between: