List of practice Questions

A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz, while the train approaches the siren. During his return journey in a different train B he records a frequency of 6.0 kHz while approaching the same siren. The ratio of the velocity of train B to that of train A is.
A geostationary satellite orbits around the earth in a circular orbit of radius $36,000\, km$. Then, the time period of a spy satellite orbiting a few hundred km above the earth's surface $ (R_ e = 6400km) $ will approximately be
Which of the following oxidation states is common for all lanthanides ?
Which one of the following noble gases, is least polarisable?
Which of the following are homologous organs?
Which is the correct increasing order of ionization energies?
When a particle is rotating in a circle will happen:
What is the structure of $ {{H}_{2}}O $ ?
van der Waals gas equation for n mole gas is:
Two vessels A and B of cross-section as shown in figure contain a liquid upto the same height. As the temperature rises, the liquid pressure at the bottom (neglecting expansion of the vessels) will:
The most stable carbonium ion among these is:
The catalyst used in Ostwalds method nitric acid preparation, is:
The chemical formula of lunar caustic is:
Solid $ PC{{l}_{5}} $ exists as:
Reaction of ethyne with HCN, in the presence of $ Ba{{(CN)}_{2}} $ is:
In human body urea is produced as an excretory product in the:
In a population, unrestricted reproductive capacity is called:
How many isomeric forms of $ {{C}_{7}}{{H}_{9}}N $ contain a benzene ring?
For a gas undergoing an adiabatic process, the relation between temperature and volume is found to be $ T{{V}^{0.4}}= $ constant. This gas must be:
During an experiment, an ideal gas is found to obey an additional law $ V{{P}^{2}}= $ constant. The gas is initially at a temperature T, and volume V. When it expands to a volume 2V, the temperature becomes:
$ CH\equiv \equiv CH\xrightarrow[{{H}_{2}}S{{O}_{4}}]{{{H}_{2}}O/H{{g}^{2+}}}X\xrightarrow{LiAl{{H}_{4}}}Y\xrightarrow{{{P}_{4}}/B{{r}_{2}}}Z, $ Here Z is:
Pi-bond (Ti-bond) is formed:
What is packing fraction of $ {}_{26}F{{e}^{56}} $ ? (At. mass = 55.92066)
An element is in $ {{M}^{3+}} $ form. Its electronic configuration is $ [Ar]\,4{{s}^{1}} $ . What is the atomic number of element?
Green vitriol is: