The total current supplied to the circuit by the battery is

The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, what will be the change in the resistance of the wire?

A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be

The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is If the balance point is obtained at *l* = 30 cm from the positive end, the e.m.f. of the battery is

Find p and q such that px2 +5x+2=0 and 3x2 +10x+q=0. have both roots in common?

If equation has roots equal in magnitude & opposite in sign, then the value of k is?

Under the same conditions how many ml of 1M KOH and 0.5M H2SO4 solutions respectively when mixed for a total volume of 100 ml produce the highest rise in temperature

For the reaction are positive. The most favourable conditions for the reaction is

The ratio of closed packed atoms to tetrahedral holes in cubic close packing is

In a crystal some ions are missing from normal sites. This is an example of

The radius of Ag+ ion is 126 pm while that of I– ion is 216 pm. The coordination number of Ag+ in AgI is

The melting point of RbBr is 628°C, while that of NaF is 988°C. The principal reason that melting point of NaF is much higher than that of RbBr is that

The ionisation energy of solid NaCl is 180 kcal/mol. The dissolution of the solid in water is endothermic to the extent of 1 kcal per mol. If the solvation energies of Na+ and Cl– ions are in the ratio 6:5, what is the enthalpy of hydration of sodium ion

At 88°C benzene has a vapour pressure of 900 torr and toluene has a vapour pressure of 360 torr. What is the mole fraction of benzene in mixture with toluene that will boil at 88°C at 1 atm pressure assuming ideal solution.

When mercuric iodide is added to the aqueous solution of KI then the

Salts of A (atomic weight 7), B (atomic weight = 27) and C (atomic weight 48) were electrolysed under identical conditions using same quantity of electricity. It was found that when 2.1g of A was deposited, weights of B and C deposited were 2.7g and 7.2g. The valencies of A, B and C are respectively.

On moving a charge of 20 coulomb by 2 cm, 2 J of work is done, then what will be the potential difference between the points?

A charged ball *B* hangs from a silk thread *S*, which makes an with a large charged conducting sheet *P*, as shown in the figure. The surface charge density of the sheet is proportional to

Four charges equal to* –Q* are placed at the four corners of a square and a charge *q* is at its centre. What is the value of *q* If the system is in equilibrium?

A charged particle *q* is shot towards another charged particle *Q* which is fixed, with a speed *v*. It approaches *Q* upto a closest distance* r* and then returns. If *q* were given a speed *2v*, what will b the closest distances of approach?

Two spherical conductors *B* and *C* having equal radii and carrying equal charges in them repel each other with a force *F* when kept apart at some distance. *A* third spherical conductor having the same radius as that of *B* but uncharged is brought in contact with *B*, then brought in contact with *C *and finally removed away from both. The new force of repulsion between *B* and *C* is

Three charges *–q _{1}, +q_{2} *and

*–q*are placed as shown in the figure. The

_{3}*x-*component of the force on

*–q*is proportional to

_{1}

What is the work done in placing a charge of 8 × 10^{-18} coulomb on a condenser of capacity 100 micro-farad?

A thin spherical conducting shell of radius R has a charge *q*. Another charge *Q* is placed at the centre of the shell. The electrostatic potential at a point *P* at a distance *R/2* from the centre of the shell is

A sheet of aluminum foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

If Ihe electric flux entering and leaving an enclosed surface respectively is the electric charge inside the surface will be

What is capacitance (in F) of a spherical conductor with radius 1 meter?

If a charge *q* is placed at the centre of the line joining two equal charges *Q* such that the system is in equilibrium then what will be the value of *q?*

## If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to

If there are n capacitors in parallel connected to *V *volt source, then the energy stored is equal to

A charged particle *q* is placed at the centre *O* of cube of length *L (ABCDEFGH)*. Another same charge *q* is placed at a distance *L *from *O*. Then the electric flux through *ABCD* is

The equations 5x2 + 12x + 13 = 0 and ax2 + bx + c = 0 (a,b,c belongs R) have a common root, where a, b, c are the sides of the ABC. Then find C .

The value of the expression will be positive for all real x if

The minimum value of the expression 4x2 + 2x + 1 is ?

Find all possible values of a for which exactly one root of x2 –(a+1)x + 2a = 0 lies in interval (0,3) ?

Find value of k for which one root of equation x2 – (k+1)x + k2 + k – 8 = 0 exceeds 2 & other is less than 2.

If q, r, s are positive, show that the equation ƒ (x) = x4 + qx2 + rx – s = 0 has one positive, one negative and two imaginary roots.

What kind of assisted reproductive technology should be prescribed if the male partner of a couple has very low sperm count?

What is the function of combined contraceptive pills?

What is the permanent methods of birth control in male and female?

Explain the steps in seed formation after a double fertilization in angiosperm.

Why the event of fertilisation in angiosperms is called double fertilisation?

Describe the sequence and process of oogenesis in schematic representation in humen female

When fetal ejection reflex pccurs> Explain the roles of diiferent hormones during parturition.

How does the placenta develop in human female?

Pollen grains are used as food supplements. explain with reason.

Ornithophilous flowers are usually bright in colour. explain with reason.

Pollen grains of anemophilous flowers are light,small and winged and are Produced in large numbers.

State the significance of parthenogenesis

How subaerial stems help in vegetative propagation?

Maize plants are monoecious and papaya plants are dioecious.Explain.