List of practice Questions

In Buna- $S$, the symbol $'Bu'$ stands for

The inverse of the proposition $(p \wedge \sim q)\rightarrow r$ is

Glucose when reduced with $HI$ and Red Phosphorus gives

Cycloalkane formed when $1, 4$ -dibromopehtane is heated with Sodium is

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?