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Which scientific instrument is used to record the speed of an aircraft?

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Important Questions on Physical World

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The physics behind fusion test reactor is:
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Methane is greenhouse gas because-
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Which of the following is/are false:
A. For a balanced equation, the number of atoms for each element in the reaction is the same for both the reactants and the products. 
B. For an unbalanced chemical reaction, the number of atoms for one or more elements in the reaction is not the same for both the reactants and products. 

 
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Physics>Mechanics>Physical World>Scope of Physics
The three central concepts in Newtonian mechanics are
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Who propounded the theory of Relativity?

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Isotopes differ in _____.
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In nuclear reactors, which of the following is used as a moderator?
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A hydrogen bomb is based on the principle of:
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The force that a neutron exerts on a proton inside an atom is _____:

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What is the maximum number a electrons that can be present in a shell represented by shell number 'n'?
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The size of atom when going from sodium to chlorine _____:
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A total solar eclipse is observed from the earth. At the same time an observer on the moon views the earth. She is most likely to see (E denotes the earth)

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Hydrogen Bomb principle is based on _____.
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Valency of sulphur _____:

 
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Cathode rays when obstructed by metal cause emission of _____.
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On which principle does the Nuclear Power Plant work?
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The difference between Isotopes of an element is due to the presence of which different numbers?
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What is the maximum number of electrons that the outermost shell can have?
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A particle of mass 200 MeV c-2 collides with a hydrogen atom at rest. Soon after the collision, the particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is N4. The value of N is: (Given the mass of the hydrogen atom to be 1 GeV c-2).........
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A carrot looks orange in colour because of the β carotene molecule in it. This means that the β carotene molecule absorbs light of wavelengths,