A coin is tossed successively three times. Find the probability of getting exactly one head or two heads?

A coin is tossed. If it shows head, we draw a ball from a bag consisting of 3 blue and 4 white balls; if it shows tail we throw a die. Describe the sample space of this experiment.

In a uniform electric field, a cube of side 1 cm is placed. The total energy stored in the cube is 8.85μJ. The electric field is parallel to four of the faces of the cube. The electric flux through any one of the remaining two faces is.

Suppose that two heat engines are connected in series, such that the heat exhaust of the first engine is used as the heat input of the second engine as shown in figure. The efficiencies of the engines are n1 and n2, respectively. The net efficiency of the combination is given by?

A charged particle oscillates about its mean equilibrium position with a frequency of Hz. The electromagnetic waves produced

A magnet is suspended in such a way when it oscillates in the horizontal plane. It makes 20 oscillations per minute at a place where dip angle is 30 and 15 oscillations per min at a place where dip angle is 60 . Find the ratio of the total earth's magnetic field at the two places?

A 1-meter long narrow solenoid having 1000 turns is placed in magnetic meridian. Find the current in the solenoid which neutralises the earth’s horizontal field of 0.36 oersted at the centre of the solenoid

If the dip circle is set at 45 to the magnetic meridian, then the apparent dip is 30 . Calculate the true dip.

At a certain place, the horizontal component of earth's magnetic field is root times of the vertical component. What the angle of dip at that place.

Discuss the local maximum and local minimum values of f(x).

What is Solubility please explain

Calculate molality of 2.5 g of ethanoic acid (CH3COOH) in 75 g of benzene

Calculate the molarity of a solution containing 5 g of NaOH in 450 mL solution

Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass

**How many Type of Solution exist , please describe **

**What is Solvent and Solute, please explain?**

**What is Solution , please explain?**

In a group of 1000 people, there are 750 who can speak Hindi and 400 who can speak English. How many can speak Hindi only ?How many can speak English ? How many can speak both Hindi and English?

A billiard ball is hit by a cue at a point distance h above the centre. It acquires a linear velocity v0. Let m be the mass and r be the radius of the ball. The angular velocity acquired by the ball is?

A simple pendulum is suspended in a lift which 5. is going up with an acceleration 5 m/s^2. An electric field of magnitude 5 N/C and directed vertically upward is also present in the lift. The charge of the bob is 1 mC and mass is 1 mg. Taking g = and length of the simple pendulum 1m, the time period of the simple pendulum is

Calculate the ratio of the speed of sound in neon to that in water vapour at any temperature. [Molecular weight of neon = 2.02 * 10–2 kg/mol and for water vapours = 1.8 * 10–2 kg/mol]

Speed of sound in air is 332 m/s at NTP. What will the speed of sound in hydrogen at NTP if the density of hydrogen at NTP is (1/16) that of air?

Silver forms ccp lattice and X-ray studies of its crystals show that theedge length of its unit cell is 408.6 pm. Calculate the density of silver (Atomic mass = 107.9 u).

X-ray diffraction studies show that copper crystallises in an fcc unit cell with cell edge of 3.608×10-8 cm. In a separate experiment, copper is determined to have a density of 8.92 g/cm3, calculate the atomic mass of copper

An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?

What is Packing Efficiency?Explian

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

**A compound is formed by two elements X and Y. Atoms of the elementY (as anions) make ccp and those of the element X (as cations) occupy all the octahedral voids. What is the formula of the compound?**

**What is Close Packed Structures please explain ?**

A number consists of three digits which are in G.P. the sum of the right hand and left hand digits exceeds twice the middle digit by 1 and the sum of the left hand and middle digits is two third of the sum of the middle and right hand digits. Find the numbers?

Four numbers are in A.P. If their sum is 20 and the sum of their squares is 120, then the middle terms are ?

Four different integers form an increasing A.P. One of these numbers is equal to the sum of the squares of the other three numbers. Find the numbers?

A particle is projected with a velocity of 30 m/s at an angle 60 above the horizontal on a slope of inclination 30 . Find its range, time of flight and angle of hit.

What is FaceCentred Cubic Unit Cell

**What is BodyCentred Cubic Unit Cell**

**What is Primitive Cubic Unit Cell ?**

Explain different properties of Metallic Solids,Molecular solids, Ionic solids and Covalent

Explain Covalent or Network Solids

Explain Metallic Solids

Explain Ionic Solids

Explain Molecular Solids

**Classification of Crystalline Solids**

What is the Difference Between Amorphous and Crystalline Solids?

What is Amorphous and Crystalline Solids

A sounding body emitting a frequency of 150 Hz is dropped from a height. During its fall under gravity it crosses a balloon moving upwards with a constant velocity of 2m/s one second after it started to fall. The difference in the frequency observed by the man in balloon just before and just after crossing the body will be:

Given that -velocity of sound = 300m/s; g = 10m/s2.

(A) 4

(B) 6

(C) 8

(D) 12

Describe the General Characteristics of Solid State

One mole of an ideal gas at a temperature T_{1 } expands slowly according to the law p/V = constant. Its final temperature is T_{2}. The work done by the gas is :

What is Projectile Motion ? Please explain with example?

A passenger is standing d distance away from a bus. The bus begins to move with constant acceleration a. To catch the bus, the passenger runs at a constant speed u towards the bus. What must be the minimum speed of the passenger so that he may catch the bus?

A driver takes 0.30 s to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of 54 km/h and the brakes cause a deceleration of 5.0m/s2, find the distance travelled by the car after he sees the need to put the brakes on ?