Chemistry Quiz Set for SSC CGL CHSL Exams 2018
Chemistry Quiz Set for SSC CGL CHSL Exams 2018
Q1. Which of the following is an example of a heterogeneous substance?
(a) bottled water
(b) table salt
(c) pieces of copper
Q2. Two samples of lead oxide were separately reduced to metallic lead by heating in a current of hydrogen. The weight of lead from one oxide was half the weight of lead obtained from the other oxide. The data illustrates –
(a) law of reciprocal proportion
(b) law of constant proportion
(c) law of multiple proportion
(d) law of equivalent proportion
Q3. One mole of a gas occupies a volume of 22.4 L. this is derived from
(a) Berzelius’s hypothesis
(b) Gay-Lussac’s law
(c) Avogadro’s law
(d) Dalton’s law
Q4. The percentage of copper and oxygen in samples of CuO obtained by different methods were found to be the same. This illustrate the law of
(a) constant proportion
(b) conservation of mass
(c) multiple proportion
(d) reciprocal proportion
Q5. The law of definite proportion was given by-
(a) John Dalton
(b) Humphry Davy
(d) Michael Faraday
Q6. With increase of temperature, which of these changes?
(b) weight fraction of solute
(c) fraction of solute presence in water
(d) mole fraction
Q7. Which of the following statement is not correct about the characteristics of cathode rays?
(a) they start from the cathode and move towards the anode
(b) they travel in straight line in the absence of an external electrical or magnetic field.
(c) characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube.
(d) characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube.
Q8. Which of the following is not correct about the cathode rays?
(a) they posseses kinetic energy
(b) they are electromagnetic waves
(c) they produce heat
(d) they produce mechanical pressure
(a) it is negatively charged particle
(b) the mass of electron is equal to the mass of neuron
(c) it is basic constituents of all atoms
(d) it is constituent of cathode rays.
Q10. Which of the following pairs have identical values of e/m?
(a) a proton and a neuron
(b) a proton and deuterium
(c) deuterium and an α-particle
(d) an electron and γ- rays
Q11. While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation?
(a) dust particles are present in the air
(b) carbon dioxide is present in the air
(c) air is a poor conductor of electricity under normal conditions
(d) none of the above
Q12. When beryllium is bombarded with alpha particles extremely penetrating radiations, which cannot be deflected by electrical or magnetic fields are given out. These are:
(a) a beam of protons
(b) alpha rays
(c) a beam of neutrons
(d) a beam of protons and neutrons
Q13. Which of the following properties of atom could be explained correctly by Thomson Model of atom?
(a) overall neutrality of atom
(b) spectra of hydrogen atom
(c) positions of electrons, protons and neutrons
(d) stability of atom.
Q14. Rutherford’s α-particles dispersion experiment concludes
(a) all positive ions are deposited at small part
(b) all negative ions are deposited at small part
(c) proton moves around the electron
(d) neutrons are charged particles.
Q15. The electron was shown experimentally to have wave properties by
(a) de Broglie
(b) Davisson and Germer
(c) N. Bohr
Ans 1.(d) Candle is a heterogeneous mixture of wax and threads. Copper is an element while bottled water and table salt are compounds.
Ans 2. (c) Law of multiple proportion
Ans 3. (c) One mole of a gas occupies a volume of 22.4 L. this is derived from Avogadro’s law
Ans 4. (a) Constant proportion according to which a pure chemical compound always contains same elements combined together in the same definite proportion of weight.
Ans 5. (c) The law of definite proportion was given by Proust
Ans 6. (c) Volume increases with rise in temperature. Thus, some water molecule may be evaporated at high temp.
Ans 7. (d) Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube is not correct
Ans 8. (b) Cathode rays are never electromagnetic waves.
Ans 9. (b) The mass of electron is equal to the mass of neuron is incorrect
Ans 10. (c) deuterium and an α-particle have identical values of e/m
Ans 11. (c) Air is a poor conductor of electricity under normal conditions
Ans 12. (c) As the neutron is a changeless particle, hence, the beam of neutrons is not deflected by electrical or magnetic fields.
Ans 13. (a) Overall neutrality of atom could be explained correctly by Thomson Model of atom.
Ans 14. (a) All positive ions are deposited at small part.
Ans 15. (b) Wave nature of electron was shown by Davisson and Germer. Davisson and Germer demonstrated the physical reality of the wave nature of electrons by showing that a beam of electrons could also differacted by crystals just like light of x-rays.
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