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A can do work in 15 days and B can do the same work in 20 days. If A and B have done work for 4 days together, the fraction of work left?

Answer:- 8/15 is the pending work expressed in fraction Given A does work in 15 Days; B does work in 20 days A and B have worked together... View Article

Find the HCF of 96 and 404

Answer:- 4 We can find the HCF by 2 methods HCF by Division 2 HCF by prime factors Factors of 96 = 2x48 or 2x2x24 or... View Article

What is the cos53

Answer:- Cos53 is a trignometric value that equals to 0.60. The 3 Trignometeric functions Sine, cosine and Tangent define the relationship... View Article

A moving coil galvanometer of resistance 100 Ω is used as an ammeter using a resistance 0.1 Ω. The maximum deflection current in the galvanometer is 100 μA. Find the minimum current in the circuit so that ammeter shows maximum deflection.

Given that, Resistance of the galvanometer is Rg = 100 Ω . Maximum deflection current in the galvanometer is, Ig=100 μA . Shunt... View Article

When a conservative force does positive work on a body A. The potential energy increases B. The potential energy decreases C. Total energy increases D. Total energy decreases

Answer: (b) Potential energy increases The conservative force exerts a positive work on the body when it pushes or displaces the body towards... View Article

A bomb is dropped from an aeroplane when it is directly above a target at a height of 1000 m. The aeroplane is moving horizontally with a speed of 500km/h. By how much distance will the bomb miss the target?

We have a 500km/h horizontally moving aeroplane travelling in the x direction. When the plane is directly over its objective, a bomb is dropped... View Article

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is? (A). 250 Ω (B). 40 Ω (C). 500 Ω (D). 25 Ω

Current and voltage sensitivity is given by IS = nBA/c……………………(1) VS = nBA/cR…………………….(2) We can find the current sensitivity of the... View Article

A point P moves in counter-clockwise direction on a circular path as shown in the figure. The movement of P is such that it sweeps out a length s = t³ + 5 , where s is in metres and t is in seconds. The radius of the path is 20m . The acceleration of P when t=2s is nearly.

Remember that fixed values of velocity and acceleration are not supplied in this issue; you must calculate them using the function provided in... View Article

An isolated particle of mass m is moving in a horizontal plane x−y along the x-axis at a certain height above the ground. It suddenly explodes into fragments of masses m/4 and 3m/4 . An instant later the smaller fragment is at y=15cm. The larger fragment at this instant is at:

Because the particle is initially travelling along the x axis, its y coordinate is 0. Because this is a single particle system, the particle's... View Article

Which of the following is not equal to watt? (a) joule/second (b) ampere x volt (c) (ampere)2 x ohm (d)ampere/volt

One Watt of power is equal to one Joule of energy consumed in one second. The Watt can also be used in order to quantify the rate at which energy... View Article

Cp and Cv are specific heats at constant pressure and constant volume, respectively. It is observed that Cp − Cv =a for hydrogen gas Cp − Cv =b for nitrogen gas. The correct relation between a and b is :

In a system, Cp is the amount of heat energy released or absorbed by a unit mass of the substance with the change in temperature at a constant... View Article

With what minimum acceleration can a fireman slide down a rope whose breaking strength is two third of his weight?

We've been given a rope with a breaking strength equal to two-thirds of the foreman sliding down on it; hence, the rope has a tension equal to... View Article

The distance between an object and a screen is 100cm. A lens produces an image on the screen when the lens is placed at either of the positions 40cm apart. The power of the lens is nearly

The central part of a convex lens is thicker than the edges. Because of its converging nature, this lens is called a converging lens. When light... View Article

An AC voltage source of variable angular frequency ωand fixed amplitude V0 is connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When ω is increased A. the bulb glows dimmer B. the bulb glows brighter C. total impedance of the circuit is unchanged D. total impedance of the circuit increases.

In an AC circuit, the amplitudes of the voltages across the components and the current in the circuit are treated as vectors. The phase... View Article

The amplitude of a particle executing S.H.M. is 4cm . At the mean position the speed of the particle is 16cms⁻¹ . The distance of the particle from the mean position at which the speed of the particle becomes 8√3cms⁻¹ , will be:

Assume that the amplitude of S.H.M. be A , at mean position the velocity of the particle is maximum hence, let velocity be Vmax , The velocity... View Article

The resistance if a wire is ‘R’ ohm. If it is melted and stretched to ‘n’ times its original length, its new resistance will be:

It is given that there is a wire of radius r, length l1 having a resistance R. Now this wire is said to be extended to a new length l2 , which... View Article

An inductor of inductance L= 400mH and resistors R1=2Ω and R2=2Ω are connected to a battery of emf 12V . The internal resistance of the battery is negligible. The switch S is closed at t=0. The potential drop across L as a function of time is:

oltage across the inductor in the circuit is proportional to the rate of current flow through the inductor. For this first calculate the current... View Article

The electric field part of an electromagnetic wave in a medium is represented by Ex = 0 Ey=2.5N/C cos[(2π × 106rad/s)t−(π × 10−2rad/mx)]

We know that the standard equation of electromagnetic wave is given by: Ey = E0cos(wt−kx) The equation that is given is: Ey=2.5N/C cos[(2π ×... View Article

Two forces, each of magnitude F have a resultant of magnitude F . What is the angle between the two forces?

The push or pull that is exerted to an item causes the body to accelerate. The force, as we all know, is a vector. As a consequence, we'll employ... View Article

To an evacuated vessel with a movable piston under a total pressure of 1 atm, 0.1 mol of He and an unknown compound (vapour pressure 0.68 atm at 0℃) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0℃ is close to:

For a better understanding of the Ideal Gas Equation, let us mention the four gas variables and one constant. Pressure (P), Volume (V), Number of... View Article

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