Class 10 Olympiads — Class 10 Science Olympiad - Sample papers

Sample mock test paper - 50 questions: Q1) “Some dinosaurs had feathers although they could not fly but birds have feathers that help them of fly.” In the context of evolution, this means that’s ______. Q2) Give a term for the action of bile from the below options:

Sample mock test paper - 50 questions: Q1) A dilute ferrous sulpahte solution was gradually added to the beaker containing acidified KMnO solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation?

Sample mock test paper - 50 questions: Q1) An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is _______.

Sample mock test paper - 50 questions: Q1) What will be the number of chromosomes present in each gamete produced by the plants if the palisade cells of a species of plant contain 28 chromosomes in all? Q2) In an attempt to demonstrate electrical conductivity through an electrolyte, the following apparatus was set up. Which among the following statement(s) is(are) correct?

Sample mock test paper - 50 questions: Q1) The main reason for the abundant coliform bacteria in the water of river Ganga is _______. Q2) At a given time, a house is supplied with 100 A at 220 V. how many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

Control and Coordination: Q1) A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of ______. Q2) A big tree falls in a forest but its roots are still in contact with the soil. The branches of this fallen tree grow straight up (vertically). This happens in response to ______.

Electricity: Q1) Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them is in the ratio. Q2) If in the given arrangement, the three resistors are replaced by a single resistor; then its resistance will be:

Light - Reflection and Refraction Q1) A ray of light goes obliquely from water to glass. The angle of incidence in the water is θ , the angle of refraction in the glass is θ the index of refraction of water is n and the index of refraction of glass in n Which of the following is a correct relationship for this case? Q2) Four students A, B , C and D performed the experiment to determine the focal length of a concave mirror by obtaining the image of a distant tree on a screen. They measured the distances between the screen and the mirror as shown in the diagrams given below:

Metals and Non-metals: Q1) An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following Q2) 2 mL each of concentrated HC1, HN03 and a mixture of concentrated HC1 and concentrated HN03 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be _____.

Carbon and compunds: Q1) Two compounds ‘A’ and ‘B’ are isomers. Which of the following statements, regarding A and B, is true? i. Both will have same IUPAC name ii. Both will have same structure iii. Both are hydrocarbons iv. Both have same molecular formula

Chemical Reactions and Equations: Q1) CaO- calcium Oxide reaction with water is regarded as exothermic. A student mixes these two products in a test tube and touches its side surface. Which of the following statement correctly describes the student’s observation? Q2) Solid calcium oxide reacts vigorously with water to form calcium hydroxide accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

Our environment and its management: Q1) If a grasshopper is eaten by a frog, then the energy transfer will be from _____. Q2) Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man. Q3) What level of pH indicates the river water to be polluted?