List of top Physics Questions

Mass flow hypothesis was first described by

Mass M is divided into two parts X and (1-X). For a given seperation the value of X for which the gravitational attraction between the two pieces becomes maximum is

Mass spectrometric analysis of potassium and argon atoms in a Moon rock sample shows that the ratio of the number of $(stable)^{40}$ Ar atoms present to the number of (radioactive) 4$^{\circ}$K atoms is 10.3. Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of 1.25 $\times$ 10. 9 yr. How old is the rock?

Main function of the RF amplifiers in a superheterodyne receiver is to

Magnetic flux linked with a stationary loop of resistance R varies with respect to time during the time period T as follows: $\phi=at(T-t)$ the amount of heat generated in the loop during that time (inductance of the coil is negligible) is

Magnetic field due to a current carrying toroidal solenoid is independent of :

Magnetic field at the center (at nucleus) of the hydrogen like atoms (atomic number =Z) due to the motion of electron in n the orbit is proportional to

Magnetic field induction at the center of a circular coil of radius 5cm and carrying a current 0.9 A is ( in S.I. units) ($\in_0$ = absolute permittivity of air in S.l. units: velocity of light= $3 \times 10^8\,ms^{-1}$ )

$M_x$ and $M_y$ denote the atomic masses of the parent and the daughter atom respectively in a radioactive decay. The $Q$-value for a $\beta^-$ decay is $Q_1$ and that for a $\beta^+$ decay is $Q_2$ . If $m_e$ denotes the mass of an electron, then which of the following statements is correct?

M.O.I. of a cylinder around its generator is

Longitudinal chromatic aberration depends on:

Light year is

Light of wavelength $5000 \times 10^{-10}m$ is incident normally on a slit The first minimum of the diffraction pattern is observed to lit at a distance of 5mm from the central maximum on a screen placed at a distance of 3m from the slit. Then the width of the slit is.

Light with an energy flux of $18 \,W \,cm^{-2}$ falls on a non-reflecting surface at normal incidence. If the surface has an area of $20 \,cm^2$, the average force exerted on the surface during a $30$ minute time span is

Largest diffraction is undergone in the case of

Laser light of wavelength 630 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 8.1 mm. A second light produces an interference pattern in which the fringes are separated by $7.2\, mm$. The wavelength of the second light is

Kilo watt hour is the unit of

K.E. of a body increases by $0.1\%$, the present increase in its momentum will be

$K^{40},Ar^{40},Ca^{40}$ are

Joule second is the unit of

It is difficult to fill a capillary tube with mercury than with water since

Isoclinic lines are the lines joining places of :

Interference fringes were produced in Youngs double slit experiment using light of wavelength $5000 ?$. When a film of material $2.5 \times 10^{-3}\, cm$ thick was placed over one of the slits, the fringe pattern shifted by a distance equal to $20$ fringe widths. The refractive index of the material of the film is

Intensity of light depends on

Initial velocity of a particle is $u$ at time $t = 0$. If acceleration $f $ of the particle is given by at, then the valid relation is