List of practice Questions

2 g of a radioactive sample having half-life of 15 days was synthesised on 1st Jan 2009. The amount of the sample left behind on 1st March, 2009 (including both the days) is
Young's double slit experiment gives interference fringes of width 0.3 mm. A thin glass plate made of material of refractive index 1.5 is kept in the path of light from one of the slits, then the fringe width becomes
Near a circular loop of conducting wire as shown in the figure an electron moves along a straight line. The direction of the induced current if any in the loop is
Hydrogen atom from excited state comes to the ground stage by emitting a photon of wavelength λ. If R is the Rydberg constant, the principal quantum number n of the excited state is
The magnetic dipole moment of a current loop is independent of
The surface temperature of the stars is determined using
The charge deposited on 4 µF capacitor in the circuit is
A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side of the principal axis, the intensity of light
Continuous emission spectrum is produced by
A coil of n number of turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. When a current of strength I is passed through the coil, the magnetic field at its centre is
A galvanometer of resistance 240 $\Omega$ allows only 4% of the main current after connecting a shunt resistance. The value of the shunt resistance is
The phenomena in which proton flips is
$y = 3 \sin \pi(\frac{t}{2} - \frac{x}{4})$ represents an equation of a progressive wave, where t is in second and x is in metre. The distance travelled by the wave in 5 s is
According to the quark model, it is possible to build all the hadrons using
A cylindrical tube open at both the ends has a fundamental frequency of 390 Hz in air. If 1/4th of the tube is immersed vertically in water the fundamental frequency of air column is
A resistor and a capacitor are connected in series with an AC source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, then applied voltage is
The amount of heat energy radiated by a metal at temperature T is E. When the temperature is increased to 3T, energy radiated is
The angle of minimum deviation for an incident light ray on an equilateral prism is equal to its refracting angle. The refractive index of its material is
In the following combinations of logic gates, the outputs of A, B and C are respectively
A stationary point source of sound emits sound uniformly in all directions in a non-absorbing medium. Two points P and Q are at a distance of 4 m and 9 m respectively from the source. The ratio of amplitudes of the waves at P and Q is
The spectral series of the hydrogen atom that lies in the visible region of the electromagnetic spectrum
A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve OC represents
Which of the following statement does not hold good for thermal radiation?
A planet revolves around the sun in an elliptical orbit. The linear speed of the planet will be maximum at
Horizontal tube of non-uniform corss-section has radii of 0.1 m and 0.05 m respectively at M and N. For a streamline flow of liquid the rate of liquid flow is