Class-10th (Science) Olympiad - CANSO

Mock Instructions

  • 1. This is Model Question Paper.
  • 2. This is an Online Worksheet.
  • 3. Total Questions-50.
  • 4. Total Time-60 minutes.


Q.1- A chemical reaction is characterized by:

  1. change in colour only.
  2. change in state (phase) only.

III. change in temperature.

  1. evolution of a gas.

(a) I and II

(b) I, III and IV

(c) Only II

(d) I, II, III and IV

Instruction: Consider the following statements about a balanced chemical equation.

  1. It saves time and space in writing.
  2. It shows the ratio of the masses of reactants and products.

III. It gives no idea about the rate of a reaction.

  1. It gives no idea about the physical states of the reactants and products.

Q.2- The incorrect statement(s) is/are:

(a) I, II, IV

(b) III and IV

(c) Only IV

(d) II and III

Q.3- Which of the following ions is furnished by acids in aqueous solution?

(a) OH- ions

(b) H+ ions

(c) H3O+ ions

(d) None of these

Q.4- Which of the following is a strong acid?

(a) nitric acid

(b) citrus acid

(c) formic acid

(d) lactic acid

Q.5-  Mendeleev’s periodic table is upset by the fact that:

(a) many elements have several isotopes.

(b) noble gases do not form compounds.

(c) some groups stand divided into two subgroups A and B.

(d) atomic weights of elements are not always whole numbers.

Q.6- Li shows resemblance in properties with Na and K. This classification is found true according to which law?

(a) Lavoisier

(b) Dobereiner

(c) Newland

(d) Mendeleev

Q.7- Assertion (A): After eating our favorite food, we feel satisfied.

Reason (R): Hypothalamus acts as the centre of satiety.

(a) Both A and R is true and R is the correct explanation of A

(b) Both A and R is true, but R is not the correct explanation of A

(c) A is true, but R is false

(d) Both A and R is false

Q.8- Some plants respond to stimuli slowly by growing in a particular direction because:

(a) information is transferred from one cell to another

(b) plant growth is directional

(c) conduction of information occur between plant and stimuli

(d) None of the above

Q.9- Conductors and insulators can be differentiated on the basis of:

(a) bounded positive charge present in outermost shell

(b) free positive charge present in outermost shell

(c) free negative charge present in outermost shell

(d) bounded negative charge present in outermost shell

Q.10-  A positively charged rod is brought near to a negatively charged electroscope and is then removed without touching it. What happens a leaf of the electroscope?

(a) It rises more and stays at that deflection.

(b) It rises more and then returns to its previous deflection.

(c) It falls and stays at that deflection.

(d) It falls and returns to its previous deflection.


Section-2-logical Thinking:

Q.11-   Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

h_ t_ l_ tt_ lht_ m_ htt_ l

(a) mmhtltm

(b) hmmttlm

(c) tmhmtlm

(d) Imtmhmt

Q.12-  A and B are a married couple. C and D are brothers. C is the brother of A. How is D related to B?

(a) Brother-in-law

(b) Brother

(c) Son-in-law

(d) Cousin

Q.13-  A girl leaves from her home. She first walks 30 m in North-West direction and then 30 m in South-West direction. Next, she walks 30 m in South-East direction. Finally, she turns towards her house. In which direction is she moving?

(a) North-East

(b) North-West

(c) South-East

(d) South-West


Section-3- High Order Thinking (HOT):


Q.14- A student took a 2 cm long magnesium ribbon and weighted it. After that, he burned the ribbon in air. What changes did he observe during this reaction?

  1. Magnesium ribbon converts into powder.
  2. It burns with dazzling white light.

III. The weight of the powder is higher than the weight of the magnesium ribbon taken.

(a) I and II

(b) I and III

(c) II and III

(d) All of these

Instruction: Four processes are used to charge an isolated metal sphere.

  1. The sphere is earthed by touching it.
  2. The earth connection is removed from the sphere.
  3. A charged rod is brought close to the sphere.
  4. The charged rod is removed.

Q.15- Which of the following option arranges the four processes sequentially?

(a) P Q R S

(b) P R S Q

(c) R P Q S

(d) R S P Q