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A body is moving along a rough horizontal surface with an initial velocity of 10ms^-1. If the body comes to rest after travelling a distance of 12m, then the coefficient of sliding friction will be

Sliding friction as the resistance created by any two objects when sliding against each other. This friction is also known as kinetic friction... View Article

A particle is projected making angle 45º with horizontal having kinetic energy K. The kinetic energy at highest point will be

When a particle is thrown obliquely near the earth’s surface, it moves along a curved path under constant acceleration that is directed... View Article

If 1/(b-a) + 1/(b-c) = (1/a) + (1/c), then a,b,c are in (1) AP (2) GP (3) HP (4) none of these

The correct answer is (3) HP A Harmonic Progression (HP) is defined as a sequence of real numbers which is determined by taking the reciprocals... View Article

If the ratio of the concentration of electrons to that of holes in a semiconductor is 7/5 and the ratio of currents is 7/4, then what is the ratio of their drift velocities? (a) 5/8 (b) 4/5 (c) 5/4 (d) 4/7

The drift velocity is defined as an average velocity attained by the charged particles (electrons) in a material due to an electric field.... View Article

Temperatures of two stars are in ratio 3:2. If wavelength of maximum intensity of first body is 4000 Å, what is corresponding wavelength of second body?

Wien’s law or Wien’s displacement law, named after Wilhelm Wien was derived in the year 1893 which states that black body... View Article

ABC is an isosceles triangle in which altitudes BE and CF are drawn to equal sides AC and AB respectively (see Figure). Show that these altitudes are equal.

Given According to the given data (i) BE and CF are altitudes. (ii) AC = AB To prove: We have tp prove that BE = CF Proof: Triangles... View Article

Point (0, -2) lies on y-axis. Is the given statement true or false?

The given statemnet is true a cartesian plane is a two-dimensional coordinate plane, which is formed by the intersection of two lines... View Article

What should be the minimum coefficient of static friction between the plane and the cylinder for the cylinder, for the cylinder not to slip on an inclined plane

Let us assume The friction force as f The normal force acting on the shell as NFor translation... View Article

A particle of mass m moving in the x direction with speed 2v is hit by another particle of mass 2m moving in the y direction with speed v. If the collision is perfectly inelastic, the percentage loss in the energy during the collision is close to:

Initial energy, E1=1/2m(2v)2+12(2m)v2=3mv2Now, by law of cnservation of momentum, 3mV=2√2mv ⇒V=2√2v3Final... View Article

Find the value of k for which the equation 3x²+2x+k=0 has distinct and real root.

Given, 3x2 + 2x + k = 0 It’s of the form of ax2 + bx + c = 0 Where, a =3, b = 2, c = k For the given quadratic equation to have real... View Article

If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (l) and cross-sectional area (a) shall respectively be (a) l and d (b) 2l , d (c) 1/2 , 2d (d) 2l , d/2

The correct answer is (c) 1/2 , 2d From ohm's law and also from resistivity we know that As the area of cross-section decreases the flowing... View Article

Two plane mirrors are inclined at an angle θ. A ray of light is reflected from the first mirror and is then incident on the second mirror from which it is again reflected. What is deviation of incident ray?

A mirror with a flat surface is a plane mirror that reflects light and produces a virtual image without the interference of an inward or outward... View Article

A particle of charge q and mass m moves in a circular orbit of radius r with angular speed ω. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on 1) ω and q 2) ω, q and m 3) q and m 4) ω and m

The correct answer is 3) q and m A magnetic moment is a quantity that represents the magnetic strength and orientation of a magnet or any... View Article

If a magnet is suspended at an angle of 30º to the magnetic meridian, the dip needle makes an angle of 45º with the horizontal. The real dip is________

If a magnet is suspended at an angle of 30º to the magnetic meridian, the dip needle makes an angle of 45º with the horizontal. The... View Article

A 2kg box sits on a 3kg box which sits on a 5kg box. The 5kg box rests on a table top. What is the normal force exerted by the 5kg box on the 3kg box?

The normal force is equal to the weight of the body during deceleration. When the body is about fall, depends on the location of the body on the... View Article

The width of a river is 1km. The velocity of the boat is 5km/hr . The boat covered the width of the river with the shortest will possible in 15 min. Then the velocity of river stream is:

Given Width of river = 3km/h the velocity of the boat =5km/hr Time is taken for shortest path = 15 mins Find out We have to... View Article

If A and B are two sets such that A ⊂ B, then what is A ∪ B?

The union of two sets X and Y is equal to the set of elements that are present in set X, in set Y, or in both the sets X and Y. This operation... View Article

n identical light bulbs, each designed to draw P power from a certain voltage supply, are joined in series across that supply. The total power which they will draw is

Electric power is the rate at which work is done or energy is transformed into an electrical circuit. Simply put, it is a measure of how much... View Article

The value of sin(45∘+θ)−cos(45∘−θ)

sin(45º+θ)−cos(45º−θ) From the trigonometric identity we know that... View Article

Find the equation of a line that cuts off equal intercepts on the coordinate axes and passes through the point (2, 3).

The point where the line or curve crosses the axis of the graph is called intercept. If a point crosses the x-axis, then it is called the... View Article

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