SureDen
Crushing and Grinding of the ore:- the ores occur in nature as huge lumps. They are broken to small pieces with the help of crushers and grinders. The p
SOLUTIONS
A solution is a homogeneous mixture to two or more chemically non reacting substance whose composition can be varied with in certain lim
Some basic concepts in chemistry:-
MatteràIts anything that occupies space, possesses mass and can be fel
Crystalline Solids:
Amorphous solids are very useful but most of the solids are crystalline in nature due to thermodynamically favorable conditions
Classification of magnetic materials:
Diamagnetic substances: Diamagnetic substances ar
Disorders due under-nutrition, mal-nutrition or over-nutrition:
Under-nutrition: if man is taking a diet, with low calorific value. After long time, our body starts eating its own proteins for energy. And out muscles start reducing their si
Biomolecules
Biomicromolecules:
All living organism, from microbes to mammals, are composed of chemical substan
Magnetic Properties:
Substance shows magnetic properties because of presence of electrons in them. Each electron in an atom behaves like a magnet because of its two
Solution is that type of colloidal system which has solid as dispersed phase and liquid as dispersion medium e.g. paints, muddy water etc. Sols may be classified as Lyophilic
Asexual Reproduction- Where offspring is produced by single parent with or without formation and fusion of gametes. e.g. Amoeba, Plan aria etc.
Her
Cell: The Unit of Life
Cell:
It is the basic structural and functional Unit of life.
Dis
Chemical properties of aliphatic aldehydes and ketones
ADDITION REACTIONS
Aldehydes and ketones are reduced to the corr
Addition reactions of benzene
Benzene gives some addition reactions. Some typical reactions are:
Addition of hydrogen
Imperfections in Solids or Crystal defects
Irregularity in the arrangement of constituent particles in solids is called crystal defect or imperfect
Classification of Proteins:-
(A). On the basis of Molecular Structure – On the basis of their molecular structure proteins a
Classification of solids – Solids can be classified into two types on the basis of the arrangements of their constituent particles (atoms, molecules or ions). These
Underground modifications of stem
Tuber :
It is the swollen tip of the underground branch or stolon. The ti
It is divided into 2 parts : (1.1) Brain and (1.2) spinal cord.
(1.1)
Out of 105 elements discovered so far, less than 21 are essential and beneficial for normal plant growth and development.
Criteria for essentiality of
Dielectric:
A dielectric is a substance which does not allow the flow of charges though it but permits them to exert electrostatics forces on one
Nitrogen forms the oxo acids such as H2N2O2 (hyponitrous acid), HNO2 (Nitrous acid) and HNO3 (Nitric Acid) with their st
Population Interaction
Interspecific interactions are interactions of populations of two differen
Aliphatic hydrocarbon form coal
The petrol obtained artificially from coal as a mixture of alkanes resembling petroleum like aliphatic hydrocarbon
CHEMICAL REACTIONS AND EQUATIONS
Writing a Chemical Reaction
Types of Chemical Reaction
Oxidation &
Physical Quantity.
A quantity which can be measured and by which various physical phenomenon can be explained and expressed in form of laws of physics is called a physical quantity. For example length, mass, time, force etc.
Ideal solutions:- “Ideal solutions are those solutions which obey the Raoult’s law under all the conditions of temperature and concentration&rdquo
Modes of occurrence of elements:- Depending upon the reactivity of the elements, they generally occur in two states:- (1) Native State (2) Combined state.
CARBOHYDRATES
Carbohydrates were originally regarded as hydrates of carbon with general formula [Cx(H2O)y]. But this definition has
Emulsions:-
Emulsions are the colloidal solutions of liquid. Both the dispersed phases as well as dispersion medium are the liquids. The two liqui
SEXUAL REPRODUCTION involves formation of male and female gamates, either by the same individual or different individuals of opposite sex.These gametes
Test Details
What is the magnitude of a point charge due to which the electric field 30 cm away has the magnitude 3 newton/coulomb
[1/4π ε 0 =9×
Test Details
The packing efficiency of the two-dimensional square unit cell shown below
Test Details
A compound MpXq has cubic close packing (ccp) arrangement of X. Its unit cell structure is shown below
The empirical formula of the compound, is
Test Details
A and B are two wires. The radius of A is twice that of B. they are stretched by the same load. Then the stress on B is [MP PMT 1993]
Test Details
The diameter of a brass rod is 4 mm and Young’s modulus of brass is . The force required to stretch by 0.1% of its length is
Test Details
A wire of length L and radius r is rigidly fixed at one end. On stretching the other end of the wire with a force F, the increase in its length is l. If another wire of same material but of length 2L and radius 2r is stretched with a force
Test Details
The force required to stretch a steel wire of 1 cm2 cross-section to 1.1 times its length would be Y=2*1011 N/m2 &
Test Details
When a 4 kg mass is hung vertically on a light spring that obeys Hooke’s law, the spring stretches by 2 cms. The work required to be done by an external agent in the stretching this spring by 5cms will be (g = 9.8 m/s2)
Test Details
Find out the magnitude of the magnetic field at point P due to following current distribution
Test Details
Current i flows through a long conducting wire bent at right angle as shown in figure. The magnetic field at a point P on the right bisector of the angle XOY at a distance r from O is
Test Details
A square coil of N turns (with length of each side equal L) carrying current i is placed in a uniform magnetic field B→=B0j
Test Details
Find out the magnitude of the magnetic field at point P due to following current distribution
Test Details
The magnetic field is downward perpendicular to the plane of the paper and a few charged particles are projected in it. Which of the following is true
Test Details
Wires 1 and 2 carrying currents f1 and f2 respectively are inclined at an angle θ to each other. What is the force on a small element dl of wire 2 at a distance of r from 1 (as shown in figure) due to the magnetic field of wire 1
Test Details
Figure shows a square loop ABCD with edge length a. The resistance of the wire ABC is r and that of ADC is 2r.
The value of magnetic field at the centre of the loop assuming uniform wire is
Test Details
A coil of 50 turns is situated in a magnetic field b = 0.25weber/m2 as shown in figure. A current of 2A is flowing in the coil. Torque acting on the coil will be
Test Details
Find magnetic field at centre O in each of each of the following figure
Test Details
A short bar magnet is placed with its south pole towards geographical north. The neutral points are situated at a distance of 20 cm from the centre of the magnet. If BH=0.3 x 10-4 wb/m2 then the magnetic moment of the magnet is
Test Details
Earth's magnetic field may be supposed to be due to a small bar magnet located at the centre of the earth. If the magnetic field at a point on the magnetic equator is 0.3×10–4 T. Magnet moment of bar magnet is
Test Details
A thermodynamic system is taken through the cycle PQRSP process. The net work done by the system is
Test Details
A transverse progressive wave on a stretched string has a velocity of 10 ms–1 and a frequency of 100 Hz. The phase difference between two particles of the string which are 2.5 cm apart will be
Test Details
Two springs of spring constants 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have potential energy in the ratio
Test Details
A metallic wire of length L metres extends by l metres when stretched by suspending a weight Mg to it. The mechanical energy stored in the wire is
Test Details
A spring of spring constant 5 x 103 N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is
Test Details
A long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be
Test Details
A body is attached to the lower end of a vertical spiral spring and it is gradually lowered to its equilibrium position. This stretches the spring by a length x. If the same body attached to the same spring is allowed to fall suddenly, what would be the maximum stretching in this case
Test Details
Two carts on horizontal straight rails are pushed apart by an explosion of a powder charge Q placed between the carts. Suppose the coefficients of friction between the carts and rails are identical. If the 200 kg cart travels a distance of 36 metres and stops, the di
Test Details
Two equal masses are attached to the two ends of a spring of spring constant k. The masses are pulled out symmetrically to stretch the spring by a length x over its natural length. The work done by the spring on each mass is
Test Details
Two equal masses are attached to the two ends of a spring of spring constant k. The masses are pulled out symmetrically to stretch the spring by a length x over its natural length. The work done by the spring on each mass is
Test Details
A long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be
Test Details
A spring of spring constant 5 x 103 N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is
Test Details
Two springs of spring constants 1500 N/m and 3000 N/m respectively are stretched with the same force. They will have potential energy in the ratio
Test Details
A metallic wire of length L metres extends by l metres when stretched by suspending a weight Mg to it. The mechanical energy stored in the wire is
Test Details
Two carts on horizontal straight rails are pushed apart by an explosion of a powder charge Q placed between the carts. Suppose the coefficients of friction between the carts and rails are identical. If the 200 kg cart travels a distance of 36 metres and stops, the di
Test Details
The potential energy of a system is represented in the first figure. The force acting on the system will be represented by
Test Details
A block of mass 2kg is released from A on the track that is one quadrant of a circle of radius 1m. It slides down the track and reaches B with a speed of 4ms-1 and finally stops at C at a distance of 3m from B. The work
Test Details
If a copper wire is stretched to make it 0.1% longer, the percentage increase in resistance will be
Test Details
The relationship between force and position is shown in the figure given (in one dimensional case). The work done by the force in displacing a body from x=1 cm to x= 5 cm is
Test Details
A liquid of density d is pumped by a pump P from situation (i) to situation (ii) as shown in the diagram. If the cross-section of each of the vessels is a, then the work done in pumping (neglecting friction effects) is
Test Details
If a copper wire is stretched to make it 0.1% longer, the percentage increase in resistance will be
Test Details
The resistance of 20 cm long wire is 5 ohm. The wire is stretched to a uniform wire of 40 cm length. The resistance now will be (in ohms)
Test Details
The main difference between a stretched membrane and the liquid surface is
Test Details
When a spiral spring is stretched by suspending a load on it, the strain produced is called
Test Details
A rubber cord catapult has cross-sectional area 25mm2 and initial length of rubber cord is 10cm. It is stretched to 5cm. and then released to project a missile of mass 5gm. Taking Y
Test Details
A wire of length L and cross-sectional area A is made of a material of Young’s modulus Y. It is stretched by an amount x. The work done is
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