List of practice Questions

$ (x^2 + xy) dy = (x^2 + y^2) dx$ is

Wurtz reaction is used to unite

Write the converse of the following statement. If you do all the exercises in the book, you get an $A$-grade in the class.

$X$ mL of $H_2$ effuse through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under identical conditions is

$??? Identify correct statements about $X$, $A$, $B$, $C\, \&\, D$, which cause global warming. i. $??? ii. ????ombines with oxygen to produce $??? iii. ??? iv. ????auses acid rain

Yeast cell divides once in approximately every

??X??s a part of respiratory system that contains C-shaped rings of hyaline cartilage.??X??s lined with ciliated, pseudostratified columnar epithelium.Identify??X?

$XO$ type of sex determination and $XY$ type of sex determination are the examples of

Xenon best reacts with

X reacts with NaOH (aqueous solution) to form Y and $H_2$. Aqueous solution of Y is heated to 323- 333 K and on passing $ {CO_2}$ into it, $ {Na_2CO_3}$ and Z were formed. When Z is heated to $1200^{\circ}C , { Al_2O_3}$ is formed. X, Y and Z respectively are

Yolk sac develops in humans from

Yogurt and buttermilk are produced with the use of

Yellow light of wavelength $6000 ?$ produces fringes of width $0.8\, mm$ in Youngs double slit experiment. If the source is replaced by another monochromatic source of wavelength $7500 ?$ and the separation between the slits is doubled then the fringe width becomes

Young?? modulus of the wire depends on

Young's modulus of steel is $1.9 \times 10^{11}\, N \,m^{-2}$. When expressed in $CGS$ units of dynes $cm^{-2}$, it will be equal to ($1 \,N = 10^5$ dyne, $1\, m^2 = 10^4\, cm^2$)

You are given two spheres of same material and radii $10\,cm$ and $20\, cm$. They are heated to the same temperature. They are placed in the same environment. The ratio of their rates of cooling will be

You are given four sources of light each one providing a light of a single colour - red, blue, green and yellow. Suppose the angle of refraction for a beam of yellow light corresponding to a particular angle of incidence at the interface of two media is $90^{\circ}$. Which of the following statements is correct, if the source of yellow light is replaced with that of other lights without changing the angle of incidence?

Zeta potential (or electrokinetic potential) is the

Zero error, instrumental error and personal errors can be respectively of group

$Z = 7x + y$, subject to $5x + y \ge 5, x + y \ge 3, x \ge 0, y \ge 0$. The minimum value of Z occurs at

Youngs's modulus for perfectly plastic body is

A person moves 30 m north, from there 20m east and finally $30\sqrt{2}$ m south-west from there His displacement from initial position is.

Zygotene of prophase-l is characterised by

Zone refining is used for the

Zone refining is based on the principle that _________.