List of practice Questions

If the roots of \(2x^2+kx+3=0\) are real and equal, then \(k=\)
\(8x^2-6x-9=\) _____ .
\(1,-\frac 12, \frac 14 ……\) are in G.P., then find 8th term.
\(4,7,10,.........\) are in A.P., then sum of \(15\) terms is ______ .
10th term of A.P.: \(13, 8,3,-2……. \) is _____ .
For the equation \(2019x+2020y=4040\), when \(x=0\) the value of \(y=\)
The minimum distance from a real object to the real image in a concave mirror is equal to
The relation between focal length and radius of curvature of a spherical mirror is
The lens that is used to rectify hypermetrophia
The relation between the speed of wave (v), wavelength (λ) and frequency (n) is
When objects of different distances are seen which of the following remain constant
The mirror used as "Rearview" mirror in vehicles is
When light passes through the liquids the change of frequency of Scattered light is related to
If the minimum angle of deviation is 30° with a Prism of angle 60°. Find the refractive index of the material of the Prism.
The focal length of eye lens changes between these values.
What is the lens makers formula?
What is the position of the image if the object is placed beyond the centre of curvature on the principal axis of convex lens?
When two ends of a conductor are connected to terminals of battery, what happens inside conductor?
What is the focal length of a double concave lens kept in air with two spherical surfaces of radii \(R_1=30 \ cm,\ R_2=60\ cm\) and refractive index of glass is \(n=1.5\)?
Which of the following is the formula for magnification of spherical mirror?
The lens which can form real and virtual images is
Unit of power of a lens.
If a convex lens is placed in water, its focal length is
The power delivered by a battery of emf 20 V is 40 W. Then the current delivered by the battery is
The frequency of direct current is _____ .