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In a laser (say neon laser) all the atoms emit the light waves of
Study the given bar graph which shows the lifetime (in hours) of neon lamps and the number of neon lamps and answer the question that follows. The number of neon lamps having life 500 hours or more but less than 700 hours is what percent of the total number of neon lamps having life 800 hours or more?
Study the given bar graph which shows the life time (in hours) of neon lamps and the number of neon lamps and answer the question that follows. The number of neon lamps having life 800 hours or more but less than 1000 hours is what percent (correct to nearest integer) of the total number of neon lamps having life 700 hours or less?
All the forms of matter except gases emit electromagnetic radiation continuously. The gases which electrically or thermally excited emit a certain wavelength only, then which of the following is/are true about the process (i) The spacing between the atoms in the other forms of matter is high than in gas (ii) The spacing between the atoms in gases is high than the other forms of matter (iii) The energy of the emitted radiation depends on the spacing between the atoms (iv) The wavelength of the emitted radiation depends on the spacing between the atoms 
A gas mixture with 5% Neon with pressure 10 atm at 27oC is entered a reactor with rate F, and another stream with pure Neon with 8 atm pressure at 27oC entered the reactor with rate 3 liter/s, product has 10% Neon with same conditions with rate P, what is the value of F?
A gas mixture with 20% Neon with pressure 3 atm at 27oC is entered a reactor with rate F, and another stream with pure Neon with 2 atm pressure at 27oC entered the reactor with rate 5 liter/s, product has 40% Neon with same conditions with rate P, what is the value of F?
Which one of the following electronic transitions in neon is not responsible for LASER action in a helium-neon laser?
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Earthquakes are the shaking and moving of the ground when energy is released in waves.   P. These waves are similar to ocean waves, which move through water. Q. These waves are called seismic waves.  R. Seismic waves, however, move through the ground. S. Earthquakes can also be caused by other natural events, such as landslides and volcanoes.  6. Manmade earthquakes happen because of nuclear testing and mining explosions.
Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.
The human eye is a complex part of the body that is used for seeing. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he really sees is the light reflected from the object. This reflected light passes through the lens and falls on the retina of the eye. Here the light induces nerve impulses that travel through the optic nerve to the brain and then over other nerves to muscles and glands.
The eye is similar to a television camera. Both the eye and the television camera convert light energy to electrical energy. The eye converts light to nerve impulses that are interpreted by the brain as the sense perception called sight. A television camera converts light to electronic signals that are broadcast and transformed into light images in a television receiver. It is wonderful that human eyes blink an average of once every six seconds. This washes the eye with the salty secretion from the tear or lachrymal glands. Each tear gland is about the size and shape of an almond. These glands are situated behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye. The sense perception that the brain releases after the eye converts light to nerve impulses is known as
With reference to the interior of the earth consider the following statements. 1] All natural earthquakes take place in the lithosphere. 2] The lithosphere refers to the portion of depth up to 200 km from the surface of the earth. 3] Earthquake waves are basically of four types — body waves, surface waves, rolling waves and shock waves. Which of the statements given above is / are correct?