List of practice Questions

Plutonium decays with half time 24000 yr. If plutonium is stored after 72000 yr, the fraction of it that remains ______
If a 46 gm golf ball has velocity 36 m/s and an electron with velocity 107 m/s. Which of these two show wave character?
The line joining the pole of the mirrors and its centre of curvature is called _____
Light of wavelength 5500 Å from narrow slit is incident on a double slit. The overall separation of 5 fringes on a screen 200 cm away is 1 cm. Calculate slit seperation.
The core used in a transformer is laminated in order to
In a superconductor, critical magnetic field
A wire is cut into 4 pieces, which are put together side by side to obtain one conductor. If the original resistance of the wire was R, the resistance of the bundle will be
Magnetic lines of force ______
In ruby laser, some of aluminium ions are (Al3+)replaced by
A given mass of a gas is at pressure P and absolute temperature T. The isothermal bulk modulus of the gas is
A spherical black body of radius 12cm radiates 450W power at 500K. If the radius is one half and the temperature doubled, the power radiated in watt will be
The expression for the efficiency of a carnot's engine is
Which of the following is adiabatic gas equation?
___ is defined as the angle of incidence in the denser medium for which the corresponding angle of refraction in the rarer medium is 90o
The velocity of light in vacuum is ________
Two forces of magnitude 5 N and 10 N act on a wooden block of mass 2 kg. If 5 N force acts towards right and 10 N force acts towards left, which one of following statements is correct?
What is the dimension of stress?
If the temperature of a liquid is raised, then its surface tension is _____
Equal masses of two substances of densities ρ 1 and ρ2 are mixed together. The density of the mixture would be
For aluminium the bulk modulus of elasticity is 7.5 x1010 N/m2 and density is 2.7 x103 kg/m2 . The velocity of longitudinal waves is aluminium is
Which of the following does not show polarization?
The end correction for the vibrations of air column in a tube of circular cross-section will be more if the tube is,
The SI unit of gravitational constant is _____
A Circular disc is rotating with angular velocity ω . A man standing at the edge walks towards the centre of the disc then the angular velocity ω.
For ordinary terrestial experiments, the observer in an inertial frame in the following cases is