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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?

Frequency and time period The definition of frequency, we can understand that if a body is in periodic motion, it... 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 (XL) Inductive reactance is defined as the opposition offered by the inductor in an AC circuit to the flow of... 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 Catalytic convertor are devices that are fixed in automobiles to... 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 Solution From the formula of the mean free path we get to know that... 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 state... 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

Continuity Mathematically, A function is said to be continuous at a point x = a, if \(\begin{array}{l}\lim_{x\rightarrow a}\end{array} \) f(x) Exists, and \(\begin{array}{l}\lim_{x\rightarrow... 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... 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... 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... 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... 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... 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 p-type... 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... 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.... 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... 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... View Article

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