A force of 20N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 joule after it moves a distance 2m. The frictional force is

The distance travelled by light in glass (refractive index=15) in a nanosecond will be

The sources of monochromatic and coherent light beam should be narrow to produce stable interference, because narrow sources can have

The number of electric lines of force passing normally through unit area is called

The wavelength of sodium light in air is 5890A. The velocity of light in air is 3×10⌃8 m/s. The wavelength of light in a glass of refractive index 16 would be close to

Three capacitors C1, C2  and C3 are connected as shown in the figure to a battery of V volt. If the capacitor C3 breaks down electrically, the change in total charge on the combination of capacitors is

The turn ratio ofa transformer is given as 2:3. f the current through the primary coil is 3A, thus calculate the current through load resistance.

Wheatstone bridge is most sensitive when the resistance of all four arms are

A light beam is incident on a rectangular glass plate (µ=1.54). The reflected light OB passes through a nicol prism.

Two unknown resistances X and Y are connected to left and right gaps of a meter bridge and the balancing point is obtained at 80 cm from left. When a 10Ω  resistance is connected in parallel to X the balancing point is 50cm from left. The values of X and Y respectively are

The seave of a galvanometer of resistance 100 Ω  contains 25 divisions. It gives a deflection of one division on passing a current of 4 x 10^-4 A. The resistance in ohm to be added to it, so that it may become a voltmeter of range 2.5 V is

A hydrogen atom emits a photon corresponding to an electron transition from an n=5 to n=1. The recoil speed of hydrogen atom is almost (mass of proton = 1.6x 10^-27 kg)

Which one is ferromagnetic substance?

What will be the height of image when an opied of 2mm is placed on the axis of a concave mirror of a distance 20cm of radius of curvature 40 cm?

A beam of ions with velocity 2 x 10⁵ m/s enters normally into a uniform magnetic field of 4 x 10^-2 T. If the specific charge of the ions is 5x 10⁷ C/kg the radius of the circular path described will be

An object moving at a speed of 5 m/s towards a concave mirror of focal length f =1 m is at a distance of 9 m. The average speed of the image is.

Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure. Which curve is correct?

de-Broglie wavelength 2 is

For a transistor is common base configuration if β 100, the value of current gain is

In p-njunction region depletion layer is caused by

 If the maximum amplitude of an amplitude modulated wave is 25 V and the minimum amplitude is 5V, the modulation index is