Recently Active Question Of The Day Questions

An object with a surface area of 0.2 m², Emissivity: 0.8 Heat capacity: 1320.0 J/K Temperature of 59.0 °C. It is then place in an environment at 38.0 °C and it cools until it is in thermal equilibrium. Stefan constant: σ ...

Explain the experiment to find the specific resistance of the material of a wire using meter bridge. (Very IMP for IIT JEE) ...

Define: emulsions, surfactants and micelles and give two examples of each! I know it is a very boring question.. but this is in jee syllabus and I feel it is important to know! ...

A diatomic gas is first heated to double its volume at constant pressure and then heated at constant volume to double its pressure. Find the average molar heat capacity for this process. Now do this for the reverse i.e. first ...

What is rolling friction? ...

Prove this tough looking and sounding Cauchy–Schwarz inequality: If x1,...,xn ε R and y1,...,yn ε R |x1y1+...+xnyn|2 ≤ (|x1|2+...+|xn|2) (|y1|2+....+|yn|2) Comment on the equality! ...

Explain hydrolysis of sucrose with proper "structure" of sucrose and products formed! ...

Give the method used in practical chemistry lab for the Detection and Identification of amino and nitro functional groups. ...

What are the different types of colloid? Give 1 example of each. ...

Derive the capacitance of concentric shells with radius a and b by taking charges Q and -Q on both the surfaces. Then electric field is found.. and then the work done is found... ...

A parallel plate capacitor of Area A and seperation D is given charges Q and q on the two plates.. Will CV=q work? Comment? How do we find V? ...

There is a cavity of radius a in a metal sphere of radius R... There is a charge q at the center of this cavity There is another cavity of radius b in the same sphere .. There is a charge Q in the center of it. Find the net f ...

Give a one one onto relation between (0,1) and R Does this prove that the number of Reals is same as the number of numbers in the interval (0,1) ? ...

Give the proof of LH rule when f(a)=0 and g(a)=0 f(x) is the numerator and g(x) is the denominator... Trust me it is not very difficult.. Use the basic definition of Derivative... (Sorry mistake galti ho gaya.) ...

Show that for any number n, there are consecutive n composites that exist... This is not an olympiad question.... It is very much from the JEE syllabus.. Just that you have to think a bit.. (hint think of n!) ...

Suppose that there are 3 concentric metallic shells placed inside each other.. (radius r, 2r, 4r respectively) the outermost is given a charge Q The middle shelll has q charge What is the charge that flows if The outermost sh ...

PHEW.... finally here..... f(0)=N g(0)=0 g(n+1)=2{f(n)/2+g(n)/2} (fractional part) f(n+1) = [f(n)/2+g(n)/2] (greatest integer..) where n is integer find f(1)+f(2)+f(3)...... infinity... N is an integer :) ...

find the resistance of a wire of length L which has a radius of r on one end and R on the other The radius changes uniformly with length And the resistivity is ρ Philip points out that this is in HCV.. So I have changed the ...

A simple one for today... What is the time in which a sphere of radius R is emptied by a hole at the bottom of it which is of radius "a" << R Only force is due to gravity. **Filled with water ...

x2=x+x+x+.... x times.... take derivative of both side... 2x=1+1+1+... x times thus, 2x=x! What is the error? Does it mean that if f(x)=g(x) then f'(x) ≠g'(x) ?? ...

This is a old trick question.. (not brillaint if u try to solve it first hand...) what is the number of solutions of x2+4x+1 = x+3 -2 ...

What is the number of flux lines passing through the following square arrangement... There is a square sheet of side 1 placed such that 2 of its sides are along the +ve x and +ve y axis. A charge q is placed at the point (0,0 ...

Solve with prooof..... (Not tough again!) highest power of 3 in 100! ...

The minute and hour hands of the clock meet at 12 o'clock What is the next time they meet? *I wud like to believe that this is a physics problem and not a mathematics one ;) ...

lets take a simple one.. what is the remainder when (1+2+3+.... n)n is divided by n-1? ...

Σk=0 to r rCk×(2n-r)C(n-k) = 2nCn ...

90 gm of a metal reacts with 80 gm of oxygen to form metal oxide. The metal oxide requires 20 litre of 1/3 N of oxidizing agent to oxidise to M5+. The molecular weight of the metal is ...

Question: A convex surface of a thin concavo-convex lenx lens of glass of refractive index 1.5 has a radius of curvature 20cm. The concave surface has a radius of curvature 60 cm. The convex side is silvered and placed horizo ...

A rectangular loop PQRS made from a uniform wire has length a, width b and mass m. It is free to rotate about the arm PQ, which remains hinged along a horizontal line taken as the y-axis. Take the vertically upward direction ...

A thread is wrapped over a massless pulley. The pulley and rope have a coefficient of friction k between them. If the thread/rope is wrapped by an angle of "theta".. then what is the ratio of the tensions on both side ...