Ch – 6 Combustion & Flame

Q.1: When a combustible substance burns on its own without the help of any external heat, it is known as ______________ combustion. a) rapid b) spontaneous c) explosive

Ch – 5 Separation Of Substances

Q.1: The mixture in which the constituents are uniformly distributed and each part of the mixture has the same properties, is known as _________________ mixture. a) Homogeneous b) Heterogeneous c) None Q.2: The substances which are mixed to form a mixture are called ____________. a) constituents b) components c) Both Q.3: Which of the followingContinue reading “Ch – 5 Separation Of Substances”

Ch – 4 Structure Of The Atom ( Part 2 )

Q.1: The distribution of electrons into different orbits of an atom was suggested by __________ and __________. a) Bohr, Bury b) Bohr, Rutherford c) Bohr, Thomson Q.2: The maximum number of electrons that can be accommodated in the outermost orbit is ________. a) 4 b) 6 c) 8 Q.3: The electrons present in the outermostContinue reading “Ch – 4 Structure Of The Atom ( Part 2 )”

Structure Of The Atom ( Part 1 )

Q.1: In 1886, E. Goldstein discovered the presence of new radiations in a gas discharge and called them ___________. a) canal rays b) electrons c) atoms Q.2: J. J. Thomson was awarded the Nobel Prize in Physics in 1906 for his discovery of ____________. a) protons b) electrons c) neutrons Q.3: ________’s atomic theory suggestedContinue reading “Structure Of The Atom ( Part 1 )”