In television tube when electrons strikes the screen, which rays are produced
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During the twisting of the wire the strain produced is
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How much heat does a 40 W bulb generates in one hour
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Heat=power×time= 40*3600 =144000
In SHM, the energy of the system
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Tuning the radio set is an example of
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The wave nature of light was experimentally verified by
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A machine gun fires 60 bullets per minute, with a velocity of 700m/s. If each bullet has a mass of 50g, find the power developed by the gun
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Mass of the bullets = 60×50 = 3000g = 3kg v = 700m/s t = 1min = 60s Power = W/t = Kinetic energy/t = 12250W
If the velocity of a body becomes double, then it kinetic energy will
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Forces in nature always occur in
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The physical quantity conserved in simple harmonic motion is
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The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon
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Which of the following Maxwell's equations, Implies the nonexistence of magnetic monopole
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The difference between Cp and Cv is equal to
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The photoelectric emission could be explained by the
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In humans, heart functions as a source of
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Color combination Red + Green + Blue =
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What can be calculated from the curve under PV graph
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If p is the momentum of an object of mass m the expression p^2/m has the base units identical to
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An instrument which can measure potential without drawing any current is
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A wheat stone bridge is said to be balanced when
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In a full wave rectifier, the rectification ratio is approximately equal to
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An air bubble in water will act like a
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If a sound travels from air to water, the quantity that remain unchanged is
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X-ray crystallography uses which law for its implementation
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A gyroscope rotates about a pivot displaced from its center of mass location. It has an angular momentum L which regains its original orientation after a period T. What is the magnitude of the torque acting on the wheel
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X-rays can not produce
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The energy stored in a condenser is in the form of
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A bike wheel rotates in the direction shown with a frequency of 1 revolution per second. It is brought to a stop in 1 second by friction applied through a block at the top of the wheel. What is the angular acceleration α (in angular units)
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A spinning bike wheel has its angular momentum vector pointing in the + z direction. If you press gently on the axle in the - x direction, as shown in the diagram, in what direction does the axle move
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In the figure, the displacement from the pivot point to the point of application is in the +z direction, and the force is in the -x direction. Hence the torque R x F is in the -y direction.
All of the following can become good magnets except
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Internal energy is a unique function of state because change in internal energy
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If 𝐶1 < 𝐶2 < 𝐶3 <𝐶4 are four capacitors and combined in series ,the equivalent capacitance for this combination is
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If the surface tension is given as 0.0049 N/m, what will be the value of m (in mg) such that the wire remains in equilibrium
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For the wire to be in equilibrium, Force exerted by the film on the wire due to surface tension (acting upwards) must be equal to the downward force due to the weight of the wire (acting downwards). If σ=surface tension, l=length of the wire 2σl = mg Substituting all the values, m = 2σl/g = 2 * 0.0049 * 0.01 ⁄ 9.81 = 99.9mg
According to bernoulli's equation where the pressure is low
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Viscosity decrease with rise of temperature for
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Which of the following formulas has the correct units for the linear momentum of photon
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The effect of negative feed-back on amplifier
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That statement that a fluid’s velocity thorugh a porous medium is directly related to the hydraulic gradient, is known as
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If the length of simple pendulum is halved and mass is doubled then the period is
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Reciprocal lattice of hexagonal lattice is
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What is the scale used for measuring the intensity of the earthquake
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The most fundamental of all sciences which provides basic principles and fundamental laws to other branches of science is
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The range of the projectile at 30 degree and 60 degree are
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For chain reaction to build up the size of the radioactive target should be
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A device for producing high-velocity nuclei is
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Hydrogen bomb is based on the principle of
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The highest value of escape velocity in solar system is planet
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Proton electron neutron and a particles have same momentum. Which of them have highest K.E
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According to Newton sound travel in air under the conditions of
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linear expansion occurs in
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I gave this test without any preparation…
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