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Which of the following changes when a particle is moving with uniform velocity? a) Speed b) Velocity c) Acceleration d) Position vector

Answer: d) Position vector Acceleration =0, Velocity = Speed = constant As the position of particle changes with time so position vector is... View Article

A mass of 10 kg is suspended vertically by a rope from the roof. When a horizontal force is applied on the rope at some point, the rope is deviated by an angle of 45∘ at the roof point. If the suspended mass is at equilibrium, the magnitude of the force is? (Assume g=10ms⁻²)

We are given a hanging mass that is pushed by a force at a certain angle. To compute this force when the mass is in equilibrium, we first build... View Article

In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will:
a) Change in previous direction b) No change c) Change in opposite direction d) None of these

Answer: (b) No Change There will be no change in deflection because the revised structure is still a wheat stone bridge.A Wheatstone bridge... View Article

The maximum value of the static friction is called limiting friction. (A) True (B) False (C) Ambiguous (D) Data insufficient

Answer: (A) True Friction is the force that prevents solid surfaces, fluid layers, and material components from sliding against each other... View Article

A non-conducting ring of radius R and mass m having charge q uniformly distributed over its circumference is placed on a rough horizontal surface. A vertical time-varying uniform magnetic field B=4t² is switched on at time t=0 . The coefficient of friction between the ring and the table, if the ring starts rotating at t=2s , is:

Let us consider the coefficient of friction to be μ . The ring is placed on a horizontal surface, while the magnetic field is vertical. So, the... View Article

Two plane mirrors are at right angles to each other. A man stands between them and combs his hair with his hair with his right hand. In how many of the images will he be seen using his right hand: A. 0 B. 1 C. 2 D. 3

Answer: B)1 Two plane mirrors are held at right angles, which implies they are inclined at a 90-degree angle, according to the query. When... View Article

A thin rod of length L is bent to form a semicircle. The mass of the rod is M. What will be the gravitational potential at the center of the circle?

The gravitational potential due to any point mass is given by the formula, ⇒ V = −GM/r, where M is the mass r, is the distance from the... View Article

Gravity separation process is used for the concentration of ______. A) Calamine B) Hematite C) Chalcopyrites D) Bauxite

Answer: b) Hematite The gravity separation technique is used to concentrate ore, as we all know. The gravity separation method is based on... View Article

Which of the following compounds is most reactive towards nucleophilic addition reactions?

a) b) c) d) Answer: (b) Nucleophilic addition reactions are addition reactions that are triggered by a nucleophile, and they are... View Article

A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X

We'll start by assuming that it's been two hours since the first cab left X. Consider one taxi departing from Y at this precise moment; taxis... View Article

A long solenoid is formed by winding 20 turns cm⁻¹. What will be the current necessity to produce a magnetic field of 20mT inside the solenoid (μ04π=10⁻⁷metreAmpere−1)

Consider Ampere’s Law, which is given as ∮ B.dl = μ0Ienc. Due to symmetry, the magnetic field at any point which lies on line CD will be equal,... View Article

In a series RLC circuit that is operating above the resonant frequency, the current A. lags the applied voltage B. leads the applied voltage C. is in phase with the applied voltage D. is zero

The capacitive and inductive reactances are equivalent at resonance. The inductive reactance will be stronger than the capacitive reactance above... View Article

The uncertainty in the position of an electron (mass = 9.41 x 10⁻²⁹g) moving with a velocity of 3.0 X 10⁴cm⁻¹ accurate up to 0.011 percent will be

In quantum mechanics, the Heisenberg uncertainty principle is a fundamental theory which explains why it is important to measure more than one... View Article

Which of the following statements in relation to the hydrogen atom is correct? (a) 3s, 3p and 3d orbitals all have the same energy (b) 3s and 3p orbitals are of lower energy than 3d orbital (c) 3p orbital is lower in energy than 3d orbital (d) 3s orbital is lower in energy than 3p orbital

Answer (a) 3s, 3p, and 3d orbitals all have the same In the 1s orbital of a hydrogen atom, there is just one electron. As a result, it is not... View Article

Using the standard electrode potential, find out the pair between which redox reaction is not feasible.E∘ values: Fe³⁺/Fe²⁺= +0.77; I2/I−= +0.54; Cu⁺²/Cu= +0.34; Ag⁺/Ag= +0.80V (A) Fe⁺³ and I⁻ (B) Ag⁺ and Cu (C) Fe⁺³ and Cu D) Ag⁺ and Fe⁺³

Answer: (d) The reduction potential for various elements: Fe3+/Fe2+ = +0.77 V I2/I− = +0.54 V Cu+2/Cu = +0.34... View Article

An electron is revolving around a proton in a circular orbit of diameter 1A∘. If it produces a magnetic field of 14 Wb/m2 at the proton, then its angular velocity will be about

In a circular orbit with a diameter of 1A, an electron revolves around a proton. If we are asked to calculate the angular velocity of a proton... View Article

A very broad elevator is going up vertically with a constant acceleration of 2m/s² . At the instant when its velocity is 4m/s a ball is projected from the floor of the lift with a speed of 4m/s , relative to the floor at an elevation of 30⁰ . The time taken by the ball to return the floor is

The component of the velocity of the ball relative to the elevator is In the x-direction, the component of velocity is vx = 4cos300=2√3m/s In... View Article

What are the total number of pi and sigma bonds in naphthalene C10H8?

Carbon atoms make up the majority of organic compounds. As a result, the bonds are generally made up of two types of bonds: sigma () and pi().... View Article

200 ml of He at 0.66 atm pressure and 400 ml of O2 at 0.52 atm pressure are mixed in a 400 ml vessel at 25degreeC. The partial pressure of He and O2 will be:

Partial pressure is the pressure of an individual gas when it is placed in a required vessel or in the final vessel. Initially volume... View Article

For 50ml of hydrogen diffuses through a small hole in 20 minutes. The time taken for 40ml of oxygen to diffuse under the same conditions in minutes is:

The movement of certain particles or anything from a high concentration area to a low concentration area is known as diffusion. Diffusion is... View Article

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