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Which of the following is not a characteristic of a waves, (a) amplitude (b) frequency (c) wavelength and (d) none

Answer: (d) none The wavelength of a longitudinal wave is the distance between two successive points in the same phase, such as two... View Article

A gun of mass M fires a bullet of mass m with maximum speed v. Given that m

The kinetic energy formula is given by, Kinetic energy =1/2 × mass × (velocity)2 Using conservation of linear momentum m1v1 + m2v2 = 0 m1 =... View Article

Write the formula of maximum velocity to avoid skidding of a vehicle moving on a level circular path.

The gravitational attraction force is measured in milligrams (mg). Frictional force (f) - acting parallel to the slope of the road between the... View Article

A jet airplane travelling at a speed of 500 km/h ejects its products of combustion at a speed of 1500 km/h relative to the jet plane. The speed of the latter with respect to an observer on the ground is:

Let's start by defining what the word "relative motion" means. The motion of a body relative to another body (referred to as an observer) is the... View Article

An object weighs 10N at the north pole of the earth. In a geostationary satellite distance 7R from the centre of the earth (of radius R). What are the true weight and the apparent weight?

Acceleration due to gravity at a height h from the surface , g ′ =g[1+h/R ]−2 For radius of orbit =7R⟹h=6R mg ′ =mg[1+ 6R/R ]−2 mg ′... View Article

Derive an expression for acceleration due to gravity at a depth ‘d’ below the earth’s earth surface.

Consider M as the mass of the earth, R be the radius of the earth gd be gravitational acceleration at depth ′ d ′ from the earth surface g be... View Article

How will the image formed by a convex lens be affected if the central portion of lens is wrapped in black paper ?

answer: The full image will be formed, but it is less bright As a result of a huge number of rays from the object forming an image. As a... View Article

How many Faradays of electricity are required to deposit 10 g of calcium from molten calcium chloride using inert electrodes? (molar mass of calcium = 40 g mol −1)

The equation is written as Ca2+ +2e− → Ca Number of moles of Ca= 10g /40g/mol =0.25mol 1 mole Ca requires =2 moles of electrons =2... View Article

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5V lies in the : A. infrared region B. X-ray region C. Ultraviolet region D. Visible region

We are given the value W=6.2eV for the work function of a photosensitive material's surface. V=5V is the stopping potential for a specific... View Article

A proton, deutron and an α-particle enter a magnetic field perpendicular to field with same velocity. What is the ratio of the radii of circular paths?

Each of the three particles has a charge. The proton has a positive charge of +e, the deuteron has a positive charge of +e, and the alpha... View Article

The northern plains are formed by a) force of convection b) interplay of himalayan rivers c) glacier erosion

Answer: (a) By the interplay of three river systems Indus, Ganga, and the Brahmaputra The Northern Plain was formed by the deposits... View Article

The periodic time of a body executing SHM is 4s. After how much interval from time t=0, its displacement will be half of its amplitude?

Simple Harmonic Motion or SHM is defined as a motion in which the restoring force is directly proportional to the displacement of the body from... View Article

To obtain displacement current of 0.2 a between the plates of a capacitor of capacity 0.5 μf, what should be the rate of change of potential difference between the plates?

A capacitor is a two-terminal electrical device that possesses the ability to store energy in the form of an electric charge. It consists of two... View Article

What is the rest mass energy of electron?

The energy described by the Einstein equation is rest mass energy. The letter 'e' stands for electron charge. The letter M stands for mega, which... View Article

The oscillating magnetic field in a plane electromagnetic wave is given by: B_y=(8×10⁻⁶)sin[2×1011t+300πx]T (i) Calculate the wavelength of the electromagnetic wave. (ii) Write down the expression for the oscillating electric field.

Electromagnetic waves are also known as EM waves. Electromagnetic radiations are composed of electromagnetic waves that are produced when an... View Article

In the circuit shown below, the key K is closed at t=0. The current through the battery is

The inductor serves as an open switch at t = 0 since there is no current flowing through it. This occurs because, when the circuit's current... View Article

The mass of a lift is 500 kg. What will be the tension in its cable ifit moves down with an acceleration

Tension is a continual force that works on the connecting medium, such as a rope or cable. This is mostly a tugging force that attempts to... View Article

The maximum number of possible interference maxima for slit-separation equal to four times the wavelength in Young’s double-slit experiment is:

Answer: 9 Young's double-slit experiment employs two coherent light sources separated by a small distance. These two light sources are... View Article

The moment of inertia of a uniform circular disc of radius R and mass M about an axis passing from the edge of the disc and normal to the disc is

Moment of inertia is defined as the quantity expressed by the body resisting angular acceleration which is the sum of the product of the mass of... View Article

For a angular projection given to a projectile, find : (i) Maximum height, (ii) Time of flight, (iii) Horizontal range.

A projectile is any object thrown into space upon which the only acting force is gravity. The primary force acting on a projectile is gravity.... View Article

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