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A sphere of radius r is charged to a potential V.What will be the outward pull per unit area of its surface? ...

55296, ?, 288, 36, 9 ...

AB is a secant which intersects a circle with centre O at the points C and D such that AC=BD. From A, B two tangents AR and BS are drawn to meet the circle at the points P and Q respectively( as given in the diagram). PQ join ...

Number of pi electrons in cyclobutadienyl anion {({C_4}{H_4})^{2-}} is ...

A mass {{m}_{1}} hanging at the end string, draws a mass {{m}_{2}} along the surface of a smooth table if the mass on the table be doubled the tension in string becomes, 1.5 times then {{m}_{1}}/{{m}_{2}} is *Image* ...

Which of the following has a trigonal planar (or triangular) structure ...

A, B and C are partners and invests in a business such that A spends 1/4th of the total. B spends 1/5th less than C. If C’s investment is 1/3, find the ratio of their profits on a amount of 4300. ...

In a material science laboratory certain salts were melted in order to find the ideal decorative crystal for interstellar travel. Salt A melted at 399 degrees, Salt B melted at 814 Salt C melted at 414 And salt D melted ...

You are given four boxes; containing four different types of substances. It is seen that the substance in the first one conducts electricity in its aqueous solution, the second conducts it in its native form/solid and the thi ...

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil w ...

2 sin -1x = cos-1 (1 -2x2) is true for ...

As shown in the figure, two equal masses each of 2 kg are suspended from a spring balance. The reading of the spring balance will be *Image* ...

The greatest bond angle is found in ...

The hydrogen bond is strongest in ...

As shown in figure a monkey of 20 g mass is holding a light rope that passes over a frictionless pulley. A bunch of bananas of the same mass is tied to the other end of rope. In order to get access to the branch the monkey st ...

The compound which contains both ionic and covalent bonds is ...

If there is no atmosphere, then the duration of daylight on earth will ...

Mohan spent 25% of his monthly earning on magazines. Out of the banana amount he spent 75% on the hostel and college fees. If he had Rs. 120 at the end of the month, find how much money he has received from his father in that ...

How many s and p-bonds are there in the molecule of tetracyanoethylene, *Image* ...

Find Magnetic field at point O *Image* ...

If sin-1x+sin-1y= frac{2pi}{3} , cos-1x–cos-1y= frac{pi}{3} , the number of ordered pairs (x, y) is ...

The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54,,mu T . What will be its value at the centre of the loop ...

Which of these salts is least ionic ? ...

Find Magnetic field at point O *Image* ...

tan(cos-1x) = sin(cot-11/2), x is ...

If x ≥ 1, then 2 tan -1x + sin-1 frac{2x}{1+{{x}^{2}}} is ...

If cosec-1x = 2 cot-12 + cos-1 (frac{3}{5}) , then x = ...

Which C-atom is the most electronegative in this structure mathop {C{H_3}}limits^{{ m{III}}}-mathop {C{H_2}}limits^{{ m{II}}}-Cequiv mathop{CH}limits^{ m{I}} ...

Element X is strongly electropositive and element Y is strongly electronegative. Both are univalent. The compound formed would be ...

frac{{sin heta }}{{1 - cot heta }} + frac{{cos heta }}{{1 - an heta }} = ...