Archives
The L.C.M. of two numbers is 495 and their H.C.F. is 5. If the sum of the two numbers is 100 then their difference is _____.
Given that According to the given data we get to know that LCM of two numbers = 495 HCF of two numbers = 5 Find out We have to determine the... View ArticleElectromagnetic radiation having λ=310 A˙ is subjected to a metal sheet having work function = 12.8 eV. What will be the velocity of photo electrons having maximum kinetic energy?
The maximum kinetic energy (eV) in photoelectric effect is given as, K.E.= hν e −Ï• Where h is the Plank’s... View ArticleA convex mirror forms the image of an object such that the distance of 10cm from a convex mirror of focal length 15cm Find the position and nature of the image.
A convex mirror is a type of spherical mirror in which the reflecting surface is the bulged out portion of the sphere, i.e. in this type of... View ArticleGiven that the number 35a64 is divisible by 3, where a is a digit, what are the possible values of a?
We know that if a number is divisible by 3, then sum of digits must be a multiple of 3. ∴ 3 + 5+a+6+4 = multiple of 3 The... View ArticleIf the radius of the earth were to shrink by one percent, its mass remaining the same, the acceleration due to gravity on the earth’s surface would
Acceleration due to gravity is represented by g. The standard value of g on the surface of the earth at sea level is... View ArticleA line forms a triangle of area 54 √3 square units with the coordinate axes. Find the equation of the line if the perpendicular drawn from the origin to the line makes an angle of 60º with the X-axis
Given α=60∘ area of triangle=54√3 Find out We have to determine the equation of a straight line on which the perpendicular... View ArticleA point charge q is placed at the corner of a cube with side l find flux through entire surface and flux through each face
Gauss Law states that the total electric flux out of a closed surface is equal to the charge enclosed divided by the permittivity. The... View ArticleGiven that two of the zeroes of the cubic poly-nomial ax3 bx² cx d are 0, the third zero is
The cubic polynomial is in the form ax3 + bx2 + cx + d and the zeroes are α, β, and γ. We know that the relation... View ArticleThe least number which when divided by 2, 3, 4, 5 and 6 leaves the remainder 1 in each case. If the same number is divided by 7 it leaves no remainder. The number is
Given The numbers 2,3,4,5 and 6 Find out We have to determine the least number which when divided by 2, 3, 4, 5, and 6 leaves 1 as a... View ArticleThe wavelength of light used in an optical instrument is λ1 = 4000 Angstrom and λ2 = 5000 Angstrom, then the ratio of their respective resolving powers (corresponding to λ1 and λ2) is
The inverse of the distance or angular separation between two objects which can be just resolved when viewed through the optical instrument is... View ArticleThrough two parallel wires A and B, 10A and 2A of currents are passed respectively in opposite directions. If the wire A is infinitely long and the length of the wire B is 2m, then force on the conductor B, which is situated at 10 cm distance from A, will be
We have two parallel current-carrying conductors, separated by a distance ‘d’, such that one of the conductors is carrying a... View ArticleA black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass=5.98×10 24kg) have to be compressed to be a black hole?
Escape velocity is defined as the speed at which an object travels to break free from either the planet's or moon's gravity and leave... View Article
Which of the following forms a virtual and erect image of the same size for all positions of the object?
(a)Convex lens (b)Plane mirror
(c) Convex mirror
(d)Concave mirror
The correct answer is (c) Convex mirror The convex mirror always forms an erect and diminished image. A convex mirror is a type of... View Article
(c) Convex mirror
(d)Concave mirror
