List of practice Questions

A travelling harmonic wave on a string is described by $y$ = 7.5 sin (0.005$x$ + 12$t$) in metre. Its time period in second is

The product of reaction between aniline and acetic anhydride is

What are the dimensions of electrical conductivity?

The $ C-H $ bond distance is the longest in

The correct order of electron gain enthalpy $ (\Delta _{eg}H) $ of the halogen atoms is

Which of the following optical phenomena is involved in the propagation of light in an optical fibre?

$50\, mL$ of each gas A and of gas B takes $150$ and $200\, s$ respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is $36,$ the molecular mass of gas A will be

A carpet of mass $m$ made of inextensible material is rolled along its length in the form of a cylinder of radius $r$ and kept on a rough floor. The decrease in the potential energy of the system, when the carpet is unrolled to a radius $\frac{r}{2}$ without sliding is $(g=$ acceleration due to gravity)

If $p :$ The earth is round, $q : 3 + 4 = 7 $ then $\left(\sim p\right)\vee\left(\sim q\right)$ is

If $\frac{\sin x}{\cos x} \times \frac{\sec x}{\operatorname{cosec} x} \times \frac{\tan x}{\cot x}=9, $ where $x \in\left(0, \frac{\pi}{2}\right)$, then the value of $x$ is equal to

The element with positive electron gain enthalpy is

One mole of propanone and one mole of formaldehyde are the products of ozonolysis of one mole of an alkene. The alkene may be

The power of a convex lens is $2 $ dioptre. Its power is to be reduced to $1.5$ dioptre, by putting another lens in combination with it. Which of the following lenses will serve the purpose?

Which of the following is false for interference of light?

The dissolution of a gas in a liquid is governed by

Which of the following is a true statement?

$2$ -bromobutane reacts with $OH ^{-}$ in $H _{2} O$ to give $2$ -butanol. The reaction involves

Let $A$ and $B$ be two mutually exclusive events such that $ P(A\cap {{B}^{c}})=0.25 $ and $ P({{A}^{c}}\cap B)=0.5 $ . Then, $ P\{(A\cup {{B}^{c}})\} $ is equal to

In a single-slit diffraction experiment, the width of the slit is reduced by half. Which of the following needs to be done if the width of the central maxima has to remain the same?

In television transmission what type of modulation is used ?

Glucose can be converted into ethyl alcohol using

Which one of the following human organs is often called the 'graveyard' of RBCs?

$\int\frac{1+log\,x}{\left(1+x\,log\,x\right)^{2}}dx$ is equal to

The electric potential V at any point $(x, y, z)$ in space is given by $V = 3x^{2}$ where $x, y, z$ are all in metre. The electric field at the point (1 m, 0, 2 m) is

The correct order of increasing oxidizing power in the series is