List of practice Questions

The radius of a sphere is measured to be (7.50 ± 0.85) cm. Suppose the percentage error in its volume is x. The value of x, to the nearest integer, is __________.
A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a/an :
Given below are two statements : Statement I : Bohr's theory accounts for the stability and line spectrum of Li⁺ ion. Statement II : Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below :
The charges on the colloidal CdS sol and TiO₂ sol are, respectively :
The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are :
Match List - I with List - II :
List - I (a) Mercury (b) Copper (c) Silicon (d) Nickel
List - II (i) Vapour phase refining (ii) Distillation Refining (iii) Electrolytic Refining (iv) Zone Refining Choose the most appropriate answer from the option given below :
In basic medium, H₂O₂ exhibits which of the following reactions ? (A) Mn²⁺ → Mn⁴⁺ (B) I₂ → I⁻ (C) PbS → PbSO₄ Choose the most appropriate answer from the options given below :
Match List - I with List - II : List - I (a) Be (b) Mg (c) Ca (d) Ra List - II (i) treatment of cancer (ii) extraction of metals (iii) incendiary bombs and signals (iv) windows of X-ray tubes (v) bearings for motor engines. Choose the most appropriate answer from the option given below :
The oxidation states of nitrogen in NO, NO₂, N₂O and NO₃⁻ are in the order of :
The oxide that shows magnetic property is :
Given below are two statements : Statement I : C₂H₅OH and AgCN both can generate nucleophile. Statement II : KCN and AgCN both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option :

In the following molecule,

Hybridisation of Carbon a, b and c respectively are :

Main Products formed during a reaction of 1-methoxy naphthalene with hydroiodic acid are :

Consider the above reaction, the product 'X' and 'Y' respectively are 

An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is :
Polar molecules are the molecules:

Match List - I with List - II. 

List - 1List - 1
aLenticelsiPhellogen
bCork cambiumiiSuberin deposition
cSecondary cortexiiiExchange of gases
dCorkivPhelioderm

Choose the correct answer from the options given below.

For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?
In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?
During the process of gene amplification using PCR, if very high temperature is not maintained in the beginning, then which of the following steps of PCR will be affected first?
The compound which shows metamerism is :
Which of the following statements is incorrect?
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature ?
In a potentiometer circuit a cell of EMF $1.5\, V$ gives balance point at $36\, cm$ length of wire. If another cell of EMF $2.5\, V$ replaces the first cell, then at what length of the wire, the balance point occurs ?
Amensalism can be represented as: