June 12, 2024
Cathode rays are made up of
  • (A) Neutral particles
  • (B) Positively charged particles
  • (C) Negatively charged particles
  • (D) None of the above
Consider the following statement :
1. Isotopes of an element have different atomic numbers.
2. Electrons have negligible mass and charge.
3. Smaller the size of the orbit, lower is the energy of the orbit
Which of the statement is/are incorrect:
  • (A) Only 1 and 3
  • (B) Only 2 and 3
  • (C) Only 1 and 2
  • (D) All of these
Arrange the following in chronological order
1. Rutherford theory
2. Dalton theory
3. Bohr theory
4. J.J. Thomson theory
Which of the statement is/are correct:
  • (A) 2413
  • (B) 2143
  • (C) 3142
  • (D) 2314
Change in the number of neutrons in an atom changes it to
  • (A) An ion.
  • (B) An isotope.
  • (C) An isobar.
  • (D) Another element
Consider the following statement :
1. Noble gases are Diatomic
2. The gram atomic mass of an element has no unit
3. 1 mole of Gold and Silver contain same number of atoms
Which of the statement is/are correct:
  • (A) Only 1 and 3
  • (B) Only 2 and 3
  • (C) Only 3
  • (D) All of these
The volume occupied by 1 mole of a diatomic gas at S.T.P is
  • (A) 11.2 litre
  • (B) 5.6 litre
  • (C) 22.4 litre
  • (D) 44.8 litre
Assertion: The Relative Atomic mass of aluminium is 27
Reason: An atom of aluminium is 27 times heavier than 1/12th of the mass of the C – 12 atom.
  • (A) If both assertion and reason are true and reason is the correct explanation of assertion.
  • (B) If both assertion and reason are true but reason is not the correct explanation of assertion.
  • (C) If assertion is true but reason is false.
  • (D) If assertion is false but reason is true.
Assertion: The Relative Molecular Mass of Chlorine is 35.5 a.m.u.
Reason: The natural abundance of Chlorine isotopes are not equal.
  • (A) If both assertion and reason are true and reason is the correct explanation of assertion.
  • (B) If both assertion and reason are true but reason is not the correct explanation of assertion.
  • (C) If assertion is true but reason is false.
  • (D) If assertion is false but reason is true.
Which of the following statement is incorrect?
  • (A) 12 gram of C – 12 contains Avogadro’s number of atoms.
  • (B) One mole of oxygen gas contains Avogadro’s number of molecules.
  • (C) One mole of hydrogen gas contains Avogadro’s number of atoms.
  • (D) One mole of electrons stands for 6.023 × 1023 electrons.
Carbon dioxide with water changes
  • (A) Blue litmus to red
  • (B) Red litmus to blue
  • (C) Blue litmus to yellow
  • (D) Doesn’t react with litmus
In the grasslands, trees do not replace the grasses as a part of an ecological succession because of
  • (A) Insects and fungi
  • (B) Limited sunlight and paucity of nutrients
  • (C) Water limits and fire
  • (D) None of the above
Which of the following is/are unique characteristic/characteristics of equatorial forests?
1. Presence of tall, closely set trees with crowns forming a continuous canopy
2. Coexistence of a large number of species
3. Presence of numerous varieties of epiphytes
Select the correct answer using the code given below:
  • (A) 1 only
  • (B) 2 and 3 only
  • (C) 1 and 3 only
  • (D) 1, 2 and 3
Which of the following is the best indicators of sulphur dioxide pollution?
  • (A) Pinus
  • (B) Ferns
  • (C) Algae
  • (D) Lichens
Consider the following:
1) Bats
2) Bears
3) Rodents
The phenomenon of hibernation can be observed in which of the above kinds of animals?
  • (A) 1 and 2 only
  • (B) 2 only
  • (C) 1, 2 and 3
  • (D) Hibernation cannot be observed in any of the above
Species facing competition might evolve mechanism that promotes co-existence rather than exclusion and that mechanism can be
  • (A) Resource partitioning
  • (B) Competitive release
  • (C) Intraspecific competition
  • (D) Interspecific competition

© 2024 Civilstap Himachal Design & Development