COMEDK Mock Test - 10 - JEE MCQ

Three capacitors, each of capacity 4 µF, are to be connected in such a way that the effective capacitance is 6 µF. This can be done by

Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its C_p/C_v value will be

A current of 1.6 A is passed through CuSO₄ solution. The number of Cu⁺⁺ ions liberated per minute are:

A ring of mass m, radius r having charge q uniformly distributed over it and free to rotate about it's own axis is placed in a region having a magnetic field B parallel to its axis. If the magnetic field is suddenly switched off, the angular velocity acquired by the ring is

The following logic gate is equivalent to:

A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration aa directed horizontally as shown in the figure. Another end of the string is pulled with constant acceleration a vertically. The tension in the string is equal to :

A bullet of mass 5 g, travelling with a speed of 210 m/s, strikes a fixed wooden target. One half of its kinetic energy is converted into heat in the bullet, while the other half is converted into heat in the wood. The rise of temperature of the bullet if the specific heat of its material is 0.030 cal/(g-°C) (1 cal = 4.2 x 10⁷ ergs) is close to

Which of the following is hypnotic ?

Which one of the following is not the correct reaction of aryl diazonium salts?

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

If the standard electrode potential of Cu²⁺/Cu electrode is 0.34 V, what is the electrode potential at 0.01 M concentration of Cu²⁺? (T = 298K)

When acetaldehyde is treated with Fehling's solution, the following precipitate is formed

The number of atoms contained in 11.2 L of SO₂ at S.T.P. are

From the following values of dissociation constants of four acids which value represents the strongest acid ?

A reaction reaches a state of chemical equilibrium only when

What is the amount of heat liberated (in k.cal) when one mole of aquesous NaOH reacted with one mole of aqueous HCl solution?

Synthetic detergents are sodium salts of long chain

A chiral compound is

Box A contains 2 black and 3 red balls, while box B contains 3 black and 4 red balls. Out of these two boxes one is selected at random, and the probability of choosing box A is double that of box B. If a red ball is drawn from the selected box then the probability that it has come from box B is

The area bounded by the curve y=xsinx and x-axis between x=0 and x=2π is

If x dy = y(dx + y dy), y > 0 and y (1) = 1, then y (-3) is equal to

∼ [ p ↔ q ] is

Which of the following statement is false?

A card is drawn at random from a well shuffled pack of 52 cards. The probability of getting a heart or diamond is

The number of terms of the A.P. 3, 7, 11, 15,...to be taken so that the sum is 406 is

The line (x - 2)/3 = (y - 3)/4 = (z - 4)/5 is parallel to the plane