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Two π bonds and half σ bonds are present in: (a) N+2 (b) N2 (c) O+2 (d) O2

The correct answer is (a) N+2 Let us first learn about sigma and pi bonds Sigma bonds are the strongest covalent bonds, owing to... View Article

n factor of K₂Cr₂O₇ is

Potassium dichromate or anhydrochromate is prepared by adding to the neutral yellow chromate of potassium in solution, a moderate quantity of one... View Article

The phase difference between current and voltage in an AC circuit is π/4 radian. If the frequency of AC is 50 Hz, then the phase difference is equivalent to the time difference of how many seconds?

The definition of frequency, we can understand that if a body is in periodic motion, it has undergone one cycle after passing through a series of... View Article

A coil has resistance 30 ohm and inductive reactance 20 ohm at 50Hz frequency. If an ac source, of 200volt, 100Hz, is connected across the coil, the current in the coil will be

Inductive reactance is defined as the opposition offered by the inductor in an AC circuit to the flow of ac current. It is... View Article

In vehicles, catalytic converter are used to (a) to increase mileage of vehicles (b) to convert CO2 into carbonates (c) to increase the efficiency of lead mixed petrol (d) to convert CO to CO2

The correct answer is (d) to convert CO to CO2 Catalytic convertor are devices that are fixed in automobiles to reduce the... View Article

The mean free path of molecules of a gas is inversely proportional to (a) r³ (b) r² (c) r (d)√

The correct answer is (b) r2 From the formula of the mean free path we get to know that Mean free path ... View Article

Determine the equivalent fractions of 2/3

Equivalent fractions are the fractions that have different numerators and denominators but are equal to the same value. Equivalent fractions... View Article

The function f(x) =[latex]frac{4-x}{4x-x^{3}}[/latex] is (a) discontinous at one point (b) discontinous at two points (c) discontinous at three points (d) none of these

Mathematically, A function is said to be continuous at a point x = a, if f(x) Exists, and f(x) = f(a) It implies that if... View Article

A car of mass 1000 kg negotiates a banked curve of radius 90 m on a frictionless road. If the banking angle is 45 degrees, the speed of the car is

Banking of roads is defined as the phenomenon in which the edges are raised for the curved roads above the inner edge to provide the necessary... View Article

Maximum kinetic energy of the positive ion in the cyclotron is

A cyclotron is a machine that accelerates charged particles or ions to high energies. Both electric and magnetic fields are used in the cyclotron... View Article

The driver of a car travelling with speed 30 m/s towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is 330 m/s, the frequency of reflected sound as heard by driver is then

Given that Speed of the car = 30m/s Frequency of horn = 600 Hz Velocity of sound in air = 330 m/s Find out We have to determine the... View Article

What was the poet’s childhood fear?

The poet’s childhood fear in the poem, My Mother at Sixty-Six, is that of losing her mother's company. Through the poem, the poet has tried... View Article

Two tuning forks have frequencies 380Hz and 384Hz respectively. when they are sounded together, they produce 4 beats. After hearing the maximum sound, how long will take to hear the minimum sound

Given that Frequency of First Tuning Fork (f₁) = 380 Hz.Frequency of Second Tuning Fork(f₂) = 384 Hz. Find out We have to determine the time... View Article

A p-type semiconductor is (a)Positively charged (b)Negatively charged (c)Uncharged (d) Neutral

A p-type semiconductor is (c)Uncharged A p-type semiconductor is formed by doping an intrinsic semiconductor with acceptor impurities. In... View Article

What is the lcm of 18,24 and 32?

Least Common Multiple (LCM) is a way of finding the smallest common multiple between any two numbers or more. A common multiple is a multiple of... View Article

How many months and week are there in a year?

The month is defined as the time from any day of one calendar month to the corresponding day of the next. There are 12 months in a year.... View Article

What is the integral of lnx

The integration denotes the summation of discrete data. The integral is calculated to find the functions which will describe the area,... View Article

A fireman wants to slide down a rope. The breaking lead for the rope is (3/4) of the weight of the man. With what minimum acceleration should the fireman slide down? (Acceleration due to gravity is g)

We can solve the question using Newton's Second law of motion Given that The rope can bear a tension 3/4 of the weight of the man. Let’s... View Article

The dipole moment of HBr is 1.6×10^{– 30}cm and interatomic spacing is 1 A˚. The % ionic character of HBr is:

Solution The charge of an electron is 1.6 x 10-19 The dipole moment of HBr=1.6×10−30m Inter-atomic spacing... View Article

A strong magnetic field is applied to a stationary electron. Then the electron remains ____________

A strong magnetic field is applied to a stationary electron. Then the electron remains stationary The magnetic force on a moving charge is... View Article

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