The ratio of the energy of an X  ray photon of wavelength 1 Å to that of visible light of wave length 500 Å is
Two wires of the same metal have same length, but their crosssectional areas are in the ratio 3 : 1. If resistance of the thicker wire is 10 Ω, then total resistance of the wires in series combination will be
The resistance of an incandescent lamp is
When a body is taken from the equator to the poles, its weight
In an ac circuit, with voltage V and current I the power dissipated is
According to Hooke's law force is proportional to
An infinite no. of capacitors with capacitances 1μF, 1/21μF, 1/41μF, 1/81μF, ...etc. are connected in parallel combination. Their equivalent capcitance will be
A capacitor of capacity 10 μ F is charged to 40V and a second capacitor of capacity 15 μ F is charged to 30V. If they are connected in parallel the amount of charge that flows from the smaller capacitor to higher capacitor in μ C is
Amount of charge flowing = 10 x 40 − 10 x 34 = 60
Rocket engines lift a rocket from earth surface, because hot gases with high velocity
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the no. of turns per cm is halved, then new value of the magnetic field will be
The magnetic field at a point at a distance 'd' from the centre on axial line of a very short bar magnet of magnetic moment M is B. The magnetic field at a distance '2d' from centre on equitorial line of magnet of magnetic moment 8 M, will be
An αparticle and a proton are accelerated at same potential difference from rest. Find the ratio of their final velocity?
When the free surface area of a liquid is increased, the surface tension of the liquid
The displacement is given by x=2t^{2}+t+5, the acceleration at t=2s is
A body crosses the topmost point of a vertical circle with critical speed. Its acceleration, when the string is horizontal will be
A body is thrown horizontally from the top of a tower of height 5 m. It touches the ground at a distance of 10 m from the foot of the tower. The initial velocity of the body is (g = 10 ms⁻^{2})
Among electron, proton, neutron and α  particle the maximum penetration capacity is for
A body is executing S.H.M. when its displacement from the mean position is 4 cm and 5 cm, the corresponding velocity of the body is 10 cm/sec and 8 cm/sec. Then the time period of the body is
A body is executing simple harmonic motion with an angular frequency 2 rad/s. The velocity of the body at 20 mm displacement, when the amplitude of motion is 60 mm, is
The distance travelled by light in glass (refractive index =1.5) in a nanosecond will be
Speed of light in glass
Distance travelled in one nanosecond
= 2 x 10^{8} x 10^{9} = 0.2 m = 20 cm
Angular momentum is
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
The moment of inertia of a thin uniform circular disc about one of the diameters is I. Its moment of inertia about an axis perpendicular to the circular surface and passing through the centre is
Two moles of monoatomic ideal gas at 60ºC are mixed adiabatically with one mole of another monoatomic ideal gas at 12ºC. The final temperature of the mixture is
Ptype semiconductor is formed when
A. As impurity is mixed in Si
B. Al impurity is mixed in Si
C. B impurity is mixed in Ge
D. P impurity is mixed in Ge
A heat engine is a device
The dimensional formula for Planck's constant (h) is
When a star moves away from earth, the spectrum of the star shifts towards higher wavelength side. This is due to
If are a right handed triad of mutually perpendicular vectors of magnitude a, b, c, then the value of is
If the kinetic energy of a body changes by 20% then its momentum would change by
A block of ice at 10ºC is slowly heated and converted to steam at 100ºC .Which of the following curves represents the phenomenon qualitatively?
A student measures the focal length of a convex lens by putting an object pin at a distance u from the lens and measuring the distance v of the image pin. The graph between u and v plotted by the student should look like
A fish looking through the water sees the world contained in a circular horizon. If the refractive index of water is 4/3 and the fish is 12 cm below the surface, what is the radius of the circle?
Statement1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion .and
StatementII: For heavy nuclei , binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z .
A transparent solid cylindrical rod has a refractive index of It is surrounded by air. A light ray is incident at the midpoint of one end of the rod as shown in the figure.
The incident angle θ for which the light ray grazes along the wall of the rod is 
A current is passing through a very thin loop of wire in the anticlockwise direction.
The two ends of a spring are displaced along the length of the spring. All displacement have equal magnitudes. In which case or cases the tension or compression in the spring will have a maximum magnitude?
M gm of a liquid of density ρ is filled in a light beaker and kept on a horizontal table as shown in the figure. The height of the liquid in the beaker is h. The beaker is wider on top than at its base and the crosssectional area of the base is A. Neglect the effect of atmospheric pressure. Now, choose the correct statement(s) from the following.
A parallelplate capacitor fixed with a dielectric slab is connected to a battery. After the capacitor is fully charged, the dielectric is removed without disturbing the remaining circuit. Then
The torque on a body about a given point is found to be equal to is a constant vector, and is the angular momentum of the body about that point. From this it follows that
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