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A transformer has turn ratio 100/1. If secondary coil has 4 amp current then current in primary coil is
Every series of hydrogen spectrum has an upper and lower limit in wavelength. The spectral series which has an upper limit of wavelength equal to 18752 Å is
If potential V=100 0.5 Volt and current I = 10 0.2 amp are given to us. Then what will be the value of resistance
If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess
If an electron and a photon propagate in the form of waves having the same wavelength, it implies that they have the same
When the no. of turns in a coil is triplled, without any change in the length of coil, its selfinductance becomes
A fully charged capacitor has a capacitance (C). It is discharged through a small coil of resistance wire embedded in thermally insulated block of specific heat capacity (s) and mass (m). If temperature of the block is raised by ΔT, the potential difference (V) across the capacitor is
When we touch the terminals of a high voltage capacitor, even after a high voltage has been cut off, then the capacitor has a tendency to
A fireman of mass 60 kg slides down a pole. He is pressing the pole with a force of 600 N. The coefficient of friction between the hands and the pole is 0.5, with what acceleration will the fireman slide down (g=10m/s^{2})
If the temperature of a black body be increased from 27^{o}C to 327^{o}C the radiation emitted increases by a fraction of
At a given temperature the ratio of r.m.s. velocities of hydrogen molecule and helium atom will be
An electron having mass m and kinetic energy E enter in uniform magnetic field B perpendicularly, then its frequency will be
The force between two short bar magnets with magnetic moments M₁ and M₂ whose centres are r meter apart is 8 N, when their axes are in same line. If the separation is increased to 2 r, the force between them is reduced to
A column of water 60 cm high supports a column of an unknown liquid of density 1500 kgm^{⁻3}. The height of liquid column is (Density of water = 1000 kgm^{⁻3})
If two soap bubbles of different radii are connected by a tube, then
A wire of length L and crosssection A is made of material of Young's modulus Y. If it is stretched by an amount x, then work done is
A particle is moving with velocity 5 m/s towards east and its velocity changes to 5 m/s north in 10 s find the acceleration
A stone of mass of 16 kg is attached to a string 144 m long and is whirled in a horizontal circle. The maximum tension the string can withstand is 16 Newton. The maximum velocity of revolution that can be given to the stone without breaking it, will be
An object is projected with a velocity of 20 m/s making an angle of 45^{o} with horizontal. The equation for the trajectory is h = Ax  Bx^{2} where h is height, x is horizontal distance, A and B are constants. The ratio A : B is (g = 10 ms⁻^{2})
Rocket engines lift a rocket from the earth surface because hot gas with high velocity
The normal magnifying power of a simple microscope is 6. The focal length of the convex lens used 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
If a spring is extended to length l, then according to Hooke's law
A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is
Two particles P and Q are located at distances r_{P} and r_{Q} respectively from the centre of a rotating dise such that
r_{P} > r_{Q}
A spherical shell has mass M and radius R. Moment of inertia about its diameter will be
If a solid spherical ball is rolling on a horizontal table, the ratio of its rotational kinetic energy to the total energy is
At 100K and 0.1 atmospheric pressure, the volume of helium gas is 10L. If volume and pressure are doubled its temperature will change to
A boy weighing 42Kg eats bananas whose energy content is 580 calories. If this energy is used to lift him from the ground. The height which he is lifted is
Which of the following phenomena establish the wave nature of light?
When a star moves away from earth, the spectrum of the star shifts towards higher wavelength side. This is due to
At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string at that instant is
At what temperature velocity of sound is double than that of at 0^{o}C
A bullet fired into a fixed target loses half of its velocity after penetrating 3 cm. How much further it will penetrate before coming to rest, assuming that it faces constant resistance to motion?
A ball whose K.E. is E is projected at an angle of 45^{o} to the horizontal. The kinetic energy of the ball at the highest point of its flight will be
2 videos16 docs143 tests

2 videos16 docs143 tests
