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The half life of Radon is 3.8 days. After how many days 1/10th part of an initial amount of the material will exist?

A marbel with speed 20cm/s rolls off the edge of a table 80cm high. How far, horizontally,from the tabel edge does the marble strike the floor?

When an electric fan rotating at an angular velocity of 30 rad/s is switched off, its velocity reduces to 10 rad/s after 20 revolution. What is the angular retardation of the fan?

It is required to install an electric pump to lift water from an underground tank to a 1000 liter overhead reservoir which has 25 m height. What must be the power of the electric motor to fill the tank in 10 mins.

A battery dissipates 5 watts when it supplies a current of 4A through it. The terminal potential at the load is 23 volt. What is the emf of the battery?

Alpha particles (m = 6.68×10−27 6.68 × 10^{- 27} kg and q = +2e) accelerate to 2 keV through a potential difference V. They enter a magnetic field B = 0.2T perpendicular to their direction of motion. What is radius of their path?

Two 10μF capacitor are connected in parallel and the combination is fed by a 12V battery. What is the energy stored in the capacitors?

A 60W lamp is emitting green light with wavelength 5550×10−10m 5550 × 10^{- 10} m . If 5% of the electrical energy of the lamp is converted to light, how many photons are being emitted by the lamp in 1s.  [h=6.63×10−34] \left [ h = 6.63 × 10^{- 34} \right ]

A period has 3 velocities 10 m/s,  20 m/s and 30 m/s inclined at angle of 120° to one another.  The magnitude of the resultant velocity is --

An object is thrown vertically upward from the ground with an initial velocity of 80 fts−180\ fts^{-1}. Its heights above the ground is parabola and is given by the equation: s=80t−16t2s=80t-16t^2. How high does the object rise above the around?

An airplane is flying on a straight level  course at 200 Km/ hour at a height of 1000 m above the ground. An anti-aircraft gun located on the ground fires a shell with an initial velocity of 300 m/s,  at the instant when the plane  is vertically above it. At what inclination, to the horizontal, should the gun be fired to hit the plane ?

A man takes 8 min to cross a 400 m wide river by swimming,  if there is no current in the river.  However, he takes 10 minutes to cross the river,  if there is current in the river. The velocity of the current is --

An engineer designs a runway to accommodate airplanes that must reach a ground velocity of 61m/s before they can take off. These planes are capable of being accelerated uniformly at the rate of 2.5m/s² What must be the minimum length of the runway?

A 35.0g bullet strikes a 5.0Kg stationary wooden block and embeds itself in the block. The block and bullet fly off together at 8.6m/s. What was the original speed of the bullet?

A wire 75cm long carrying a current of 6.0A is at right angles to a uniform magnetic field. The magnitude of the force action on the wire is 0.60N. What is the strength of the magnetic field?

A laptop computer requires an effective voltage of 9.0 volts from the 240V line. Current drawn by the computer is 125mA. What is the current in the primary circuit?

Three particles are placed in a line. The left has a charge of -67μC, the middle +45μC and the right -83µC. The middle is 72cm from each of the others. What is force on the middle particle?

A person in a railroad car blows a trumpet note at 440Hz. The car is moving towards a wall at 20.0m/s. What is the frequency of the sound heard by an observer at the wall? Assume that the speed of sound in air is 343m/s

The speed of light in a particular type of glass is 1.6 x 10⁸m/s. What is the refractive index of the glass?

If the sound level is increased by 3dB, what is the corresponding change in the intensity level?

The resultant of two forces P and Q acting at a point is   3Q \sqrt{3} Q   and it makes an angle of 30° with the direction of P. Then P =?

A plate of area 10cm² is to be electroplated with copper (density 9.0gm/cm³) to a thickness of 0.001cm on both sides using a battery of 12 volts. What is the energy spent by the battery in the process of deposition?

An FM radio station broadcasts on a frequency of 94.5 MHz. The station uses a half wavelength antenna.What is the length of the antenna?

The names of formula of the following sentence are given below.i. corundum ,Al2O3ii. cryolite, AlF3,3NaFiii. cerusite, PbCO3which statement are correct?

What compound is formed when Cl2 is passed in slaked lime at 40°C?

How much percentage of inert gases (by volume) is present in air?

Among four elements with following electron distribution of the 2nd period which has largest atomic radius?

In some endothermic reaction (P→Q) , activation energy is 60 kj/mol and reaction enthalpy is 20kj/mol. In it's opposite reaction,what will be it's activation energy?

Sn(s) +2Ag+→Sn2+(aq)+2Ag(s); what is helpful to increase the emf of this cell?

Which one is not correct?

If current of 5A is passed through a CuSO4 solution for 15 minutes,the amount of copper will be deposited on the cathode will be -[Cu=63.5]

The elements listed below,which has the unpaired electrons in their electronic configuration?

A solution has hydroxylion( OH) concentration of 6.2×10-7mol/L. The pH of this solsolution will be -

H2(g)+I2(g)→2HI(g) ,in equilibrium of this reaction,H2,I2 and HI concentration are 8, 3 and 28 mol/L. The Kc of this reaction wI'll be-

CH3Cl(I)+Cl2(g)→CH2Cl2+HCl(g), this reaction occurs with endothermic bond dissociation and exothermic bond formation . Here bond energy of C-H ,C-Cl,Cl-Cl and H-Cl are 430,328,243 and 433 kj/mol. What will be the value ∆H of above the reaction?

Valency and oxidation number of C in compound CH2Cl2  are as follows,

Molar concentration of 10% Na2CO3 solution is-

A four carbon alcohol was oxidized with acidified potassium dichromate to from ketone.which structure does represent the original alcohol?

Benzine reacts with chlorine in presence of sunlight to produce -

The most suitable method of converting ethonal into iodoethane would be to-

During determination of N2 . It is seen that involved NH3 from 3.5gm anniline can be neutralize by 3.69 cm3 of 0.0103 M HCl. The percentage of the N2 in aniline is-

Complete the following chemical reaction: C6H5COCl+CH3-NH2→........+ HCl

The poisonous gases were not------- in the air.