What will be the variance of the number of green balls drawn is if A box contains 15 green and 10 yellow balls. If 10 balls are randomly drawn, one by one, with replacement?

What will be maximum area (in sq. m) of the flower-bed if Twenty meters of wire is available for fencing off a flower-bed in the form of a circular sector?

A rocket is launched normal to the surface of earth, away from the Sun, along the line joining the Sun and the Earth. The Sun is 3 *10^5 times heavier than the Earth and is at a distance 2.5 *10^4 times larger than the radius of the Earth. The escape velocity from Earth’s gravitational field is ve = 11.2 km /s The minimum initial (vs) required for the rocket to be able to leave the Sun-earth system is closest to(Ignore the rotation and revolution of the Earth and the presence of any other planet).

An electron in a hydrogen atom undergoes a transition from an orbit with quantum numebr ni to another with quantum number nf. Vi and Vf are respectively the initial and final potential energies of the electon. If vi/ vf =6.25, Then what is smallest possible nf is

The sides of a right angled triangle are in arithmetic progression. If the triangle has area 24, then what is the length of its smallest side ?

If a chord, which is not a tangent, of the parabola y2 = 16x has the equation 2x + y = p, and midpoint (h, k), then what is(are) possible value(s) of p, h and k ?

A crystalline solid of a pure substance has a face-centred cubic structure with a cell edge of 400 pm. If the density of the substance in the crystal is 8 g cm-3, then the number of atoms present in 256 g of the crystal is N × 1024. The value of N?

Why colour of the X2 molecules of group 17 elements changes gradually from yellow to violet down the group?

How many unpaired electrons are present in Co3+ ion?

How many groups are occupied by p-block elements in long form of periodic table?

What is the power of accommodation of the eye?

A myopic person uses specs of power –0.5 D. What is the distance (in meter) of the far point of his eye?

What is Sublimation? Please explain?

Two balls are dropped to the ground from different heights. One ball is dropped 2s after the other but they both strike the ground at the same time. If the first ball takes 5s to reach the ground, then the difference in initial heights is (g = 10 ms–2) 40

16. A train covers a distance of 90km at a uniform speed. Had the speed been 15km/hr more, it would have taken half an hour / hr for the journey. What will be the original Speed of the train.

15. In a two digit number, the sum of the digits is 13. If the number is subtracted from the one obtained by inter changing the result is 45. Find the number.

What will be current through electric iron if an electric iron rated as 800W, 200V operating at the voltage of 100V?

What will be energy of an alfa particle when it is accelerated by a potential difference of 3V?

Number of electrons to be put on a spherical conductor of radius 0.1 m to produce an electric field of 0.036N/C just above its surface is

An Athletic completes one round of a circular track of radius 2.5 m in 12 sec. What will be the magnitude of displacement (in meter) at the end of 54 sec.

## What will be the relative rates of diffusion between CH4 and SO2? (Mol. mass of SO2 = 64 & CH4 = 16)

What will be the relative rates of diffusion between CH4 and SO2? (Mol. mass of SO2 = 64 & CH4 = 16)

Find the volume of a pyramid whose base is a square with side lengths of 10 m and height 9 m.

How many edges faces and vertices are on a cone?

What type of pyramid has four faces?

What is the edge of a cube?

What is a square based pyramid?

How many vertices are in a pyramid?

What is the number of vertices in a pyramid with 10 faces?

What is the rate of acceleration of gravity?

Mr. Sharma and Mr. Arora are family friends and they decided to go for a trip with family . For the trio they reserved their rail tickets . Mr. Arora has not taken a half ticket for his child who is 6 years old where as Mr, Sharma has taken half tickets for his two children who are 6 year and 8.5 year.A railway half ticket costs half of the full fare but the reservation charges are the same as on a FULL TICKET. MR AND MRS ARORA PAID 1700,WHILE MR AND MRS SHARMA PAID 2700. Find the full share of one ticket and reservation charges per ticket.

Can the number n ^6,n being a natural number ,end with the digit 5? Give reasons.

A man has certain note of denomination 20 and 5 which amount to 380 . If the number of notes of each kind are interchanged,they amount to 60 less than before . Find the number of notes of each denomination.

Explain with a suitable diagram

Explain why sodium is more reactive than lithium.

What is the matrix and what is the use of it? What are the types and how it works?

What is hysteresis loss? Where does the loss actually occur?

What is Atom? What is Mass? What is difference between both?

What is th formula of sodium sesquicarbonate, which is used for wool washing

What is Distance and displacement calculation? What is the difference between both of you.

What is the difference between Active and Passive Voice sentences? Please help me with examples!

What is the meaning of microvascular niche? What does niche refer to in biology?

What is ascent of sap?

Name the largest blood vessel in the human body

What compound is Plaster of Paris? How is it prepared? What happens when it is mixed with water and allowed to stand? Mention two applications of this property of Plaster of Paris

Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity.

Define exothermic and endothermic reactions? Give examples.

Why should a magnesium ribbon be cleaned before burning in air?

Please explain me Kinetic Energy and what will happened when we increase the speed then what will be the kinetic energy of the moving body