List of practice Questions

At the centre of earth a body has centre of mass, but no centre of gravity. This is because $g = 0$ at the centre of earth.
Which of the following is not an ore of iron?
A body can be at rest even when it is under the action of any number of external forces. Vector sum of all the external forces is zero.
Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction. (I)$C_6H_5COCH_3$ (II) $CH_3 CO-C_2H_5$ (III)$C_6H_5CHO$ (IV) $Cl-CH_2 - CHO$
Electron affinity is positive, when
The composition of a sample of wustite is $Fe _{0.93} O$. What percentage of the iron is present in the form of Fe (III)?
When acidified $K _{2} Cr _{2} O _{7}$ solution is added to $Sn ^{2+}$ salts, then $Sn ^{2+}$ changes to
What would be the expected product of the reaction of propyne with$ Br_{2}/H_{2}O$ if the mechanism of this reaction is analogous to that of propene?
The strongest acid among the following is
On commercial scale phenol is obtained from chlorobenzene. The chlorobenzene needed for the purpose is prepared byRaschig?? process. Which one of the following is Raschig?? process?
How many $mL$ of $0.125\, M \,Cr ^{3+}$ must be reacted with $12.00 \,mL$ of $0.200\, M\, MnO _{4}^{-}$if the redox products are $CrO _{7}^{2-}$ and $Mn ^{2+}$ ?
At $300 \,K , 36\, g$ of glucose present per litre in its solution has an osmotic pressure of $4.98$ bar. If the osmotic pressure of solution is $1.52$ bar at the same temperature, what would be its concentration?
According to Hardy schulze law, the flocculating power of an ion increases with
Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives
Which of the following is a secondary pollutant ?
Which of the following is a secondary pollutant
In a common emitter $(CE)$ amplifier having a voltage gain $G$, the transistor used has transconductance $0.03 \,mho$ and current gain $25$. If the above transistor is replaced with another one with transconductance $0.02$ $mho$ and current gain $20$, the voltage gain will be :
Hardening of leather in tanning industry is based on
For isothermal expansion of an ideal gas, the correct combination of the thermodynamic parameters will be
Pick out the wrong statement
Empirical formula of a compound is $CH_2O$ and its molecular mass is $90$, the molecular formula of the compound is
A spherical shell is shown in figure. What is the electric field inside the shell?
In which of the following viscous force does not depend ?
Dimensions of planck's constant is equal to that of
Positive rays made of