Please select a subject first
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Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
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A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
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Answer the following questions based on a hot cathode ray tube
Name the charged particles
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Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
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Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
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State three factors on which the rate of emission of electrons from a metal surface depends
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Why do Free electrons not leave the metal surface on their own
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How can they be made to leave the metal surface? (State any two ways)
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State the dependence of angle of deviation on the refractive index of the material of the prism.
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State the dependence of angle of deviation on the wavelength of light
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State the ways by which the frequency of transverse vibrations of a stretch string can be increased
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The music system draws a current of 400 mA when connected to a 12 V battery.
- What is the resistance of the music system?
- The music system if left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing?
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An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.
Find the atomic number and atomic mass of the element S.
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A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
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From the diagram given below. answer the question that follows:
1) What kind of pulleys are A and B?
2) State the purpose of pulley B.
3) What effort has to be applied at C just raise the load L = 20 kgf?
(Neglect the weight of pulley A and friction)
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A pulley system has three pulleys. A load of 120 N is overcome by applying an effort of 50N. Calculate the Mechanical Advantage and Efficiency of this system.
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Write a relationship between the angle of incidence and angle of refractions for a given pair of media
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What do you understand by the term Scattering of light?
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Give one reason for Ultrasonic waves use for echo depth sounding purpose.
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