HBCSE INJSO Sample Question Paper 2018 Indian National Junior Science Olympiad : Homi Bhabha Centre

Name of the Centre : Homi Bhabha Centre For Science Education
Name Of The Exam : INJSO – Indian National Junior Science Olympiad 2018
Name Of The Subject : Junior Science
Document type : Sample Questions/Past Papers
Year : 2018
Website : http://olympiads.hbcse.tifr.res.in/how-to-prepare/past-papers/

HBCSE INJSO Sample Question Paper

Question Paper of INJSO Indian National Junior Science Olympiad 2018 – 2018 Sample Questions and model Solutions is now available in the official website of Homi Bhabha Centre For Science Education.

Related / Similar Question Paper : HBCSE INJSO Question Paper 2020

Instructions

** Write your roll number on top of this page in the space provided.
** Use only black or blue pen to write your answers in the Answer Sheet provided. Do not use a pencil.

** Before starting, please ensure that you have received a copy of this Question paper containing a total of 20 pages (20 sides on 10 sheets including the first 2 cover pages for instructions and values of physical constants).

** In section A, there are 30 multiple choice questions with 4 alternatives, out of which only 1 is correct. You get 1 mark for every correct answer and – 0.25 mark for every wrong answer.
** In Section B there are 12 questions of total 60 marks.

** For each of the 12 questions in Section B, a separate page has been provided in the Answer sheet, with the particular question number indicated in the top left hand corner. One additional page for answering those questions has also been appended, in case of necessity.

** A blank page has been provided in the Answer sheet, for rough work.
** Write the answers in the answer sheet only.
** Calculator(s) and mobile phone(s) are not allowed.
** The Answer Sheet must be returned to the invigilator. You may take this Question paper with you.

Download Question Paper:
INJSO QP : https://www.pdfquestion.in/uploads/INJSO2018.pdf
Solutions : https://www.pdfquestion.in/uploads/INJSO2018Sol.pdf

Model Questions

INJSO 2018
Date: 27th January 2018
Duration: 3 Hours
Maximum marks: 90

Section – A

Questions 1 to 30 are Multiple Choice questions with every correct answer carrying 1 mark and every wrong answer carrying – 0.25 mark.
1. Natural water contains about 0.02% D2O (heavy water). When it is enriched to 20% (by volume), calculate the fraction of weight due to neutrons in 1 mole of water sample.
a) 0.355
b) 0.444
c) 0.455
d) 0.500

2. A piece of alloy of Al and Zn weighing 1.67 g was completely dissolved in acid and evolved 1.69 litre of hydrogen at NTP. What is the percentage of Al in the piece of alloy?
a) 26.5%
b) 48.5%
c) 51.5%
d) 73.5%

3. The DNA sequence of the genome of a virus is known and contains equal number of A, T G and C. The genome is composed of double stranded DNA molecule. It is 10Kb in length. If one searches the genome for the presence of the following sequence 5?-AAAAAA-3?/3?-TTTTTT-5?, predict the number of such stretches that are likely to occur. (1Kb = 1000 base pairs).
a) Two
b) Eight
c) Sixteen
d) Thirty two

4. An astronaut has to burn 40g of glucose in his body per hour to get the required energy. Find the amount of oxygen that would need to be carried in space to meet his energy requirement for thirty days.
a) 10.2 kg
b) 28.8 kg
c) 30.7 kg
d) 96.1 kg

5. A particle moves along positive X-axis with a velocity (in a suitable unit) varying as (4 – 3t – t2) where t is time in seconds. Students draw following four conclusions.
(I) Initially the particle is at the origin.
(II) Initial speed of the particle is zero.
(III) The particle decelerates till t = 1 s.
(IV) The speed of the particle goes on increasing after t = 1 s.
Therefore, conclusions
a) (i) & (ii) are sometimes correct, (iii) & (iv)are always correct,
b) (i), (iii) & (iv) are always correct and (ii) is sometimes correct
c) (i), (iii) & (iv) always correct, (ii) is never correct
d) (i) is sometimes correct, (ii) is never correct, (iii) & (iv) are always correct

6. Titration is carried out for 3 moles of a mixture of ferrous and ferric sulphate, which required 100 mL of 2 M potassium permanganate in acidic medium. Hence the mole fraction of ferrous sulphate in the mixture is ______.
a) 1/3
b) 2/3
c) 2/5
d) 3/5

7. Many proteins of the chloroplast are encoded by genes in the nucleus. In these cases the RNA is transcribed in the nucleus, translated by the cytoplasmic ribosomes and the protein transported to the chloroplast. For such a protein how many membrane(s) does the protein cross to reach the thylakoid space (lumen) of the chloroplast?
a) One
b) Two
c) Three
d) Four

8. A ray of light passes through a thick glass sheet with some angle of incidence as shown. The refractive index of glass is ______.
a) Exactly d/DC.
b) Approximately d/DC.
c) Approximately d/AD.
d) Approximately AD/AC.

9. A sample of clay was partially dried and then found to contain 60% silica and 8% water .The original sample of clay contained 15% water. Find the percentage of silica in the original sample.
a) 52.3%
b) 47.8%
c) 55.5%
d) 51.7%

10. A plant has pink flowers. When this plant was self pollinated, there were three types of progeny obtained; progeny with red flowers, pink flowers and white flowers that appeared in the ratio of 1:2:1. From the given information how many alleles are involved in the formation of these flower colours?
a) One
b) Two
c) Three
d) Four

11. A beaker of mass 50 g, with 262 g of water in it, is kept on a weighing machine. A uniform hollow brass ball of total volume 36p cc is inserted into the water in the beaker. It is observed that the ball floats on water. The weighing machine now reads 400 g. Density of brass is 8 g/cc, while that of the air inside the brass ball can be neglected. Thickness of the brass used to prepare the ball must be nearest to ______.
a) 0.5 mm
b) 0.8 mm
c) 1 mm
d) 1.2 mm

12. If a body exerts a force on a surface, the surface exerts a reaction force on the body. This reaction force is always along normal to the surface at that point and is popularly known as the normal force N. When the body slides on a surface, the surface exerts a force of friction on the body in the direction opposite to the direction of slipping. The magnitude of this frictional force is given by , where is a constant (called coefficient of friction) for the given pair of surfaces in contact and N is the normal force. Consider a block of mass 100 kg placed on a level surface. If one person tries to push it with a force F, he is unable to do so. He receives help from two of his friends and each one applies the same force F. Now the block moves with a uniform acceleration of 0.5 m/s2. After sometime, one of them happens to leave the exercise of pushing the block. This time the block moves with a uniform speed. The magnitude of force F and the coefficient of kinetic friction µ are respectively ______.
a) 50 N, 0.05
b) 100 N, 0.1
c) 50 N, 0.1
d) 100 N, 0.2

13. The elements A, B, C, and D belong to the groups 1, 2, 14, and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
a) A and D
b) B and C
c) A and B
d) C and D

14. How many molecules of water of hydration are present in 252 mg of oxalic acid (C2H2O4.2H2O)?
a) 1.2 x 1021
b) 1.7 x 1021
c) 2.4 x 1021
d) 3.4 x 1021

15. Which of the following is NOT a component of the theory of natural selection when Darwin proposed his theory?
a) Heritable variations allow some individuals to compete more successfully for resources.
b) Selective pressure allows some individuals in a population to reproduce more than others.
c) All new variations in a given population arise from spontaneous mutation in genes.
d) Some new variations are passed on to the next generation.

Section – B

Questions 31 to 42 are long questions. Marks are indicated in the brackets. Answer the questions only in the answer sheet provided.
Question 31 :
A) An ion with mass number 79 when placed between two electrically charged plates with potential difference 1 V gains energy of 2 eV and moves towards the positive plate. If the ion contains 25 % more neutrons than the electrons, identify the ion. [Total=3 marks]

B) Trisha was given a silvery white metal (A) and she was asked to heat it in air. Trisha did that and observed that a white ash (X) is formed. Out of curiosity she dissolved the ash (X) in water and obtained a solution (Y). Trisha tested the solution (Y) using pH paper and found that it turned blue. (Y) is commonly used in dental work as an antimicrobial, and is the substance of choice of dentists for forming a protective layer known as an apical barrier. (Y) when reacts with chlorine gas gives (B),which is used as a toilet cleaner. To this solution (Y), she added dil sulphuric acid and obtained a white precipitate (Z). Help Trisha to identify A, B, Y, Z. Write balanced equations for all the reactions involved. [Total=2 marks]

Question 32 :
A point object is moved away from 5 cm to 90 cm along the principal axis of a concave mirror of radius of curvature 60 cm. (Distances are from centre of the mirror).
Using Cartesian sign convention, calculate image distances (v) for at least ten suitable object distances (u) and tabulate the values.
Plot a graph of v against u using the tabulated values with a proper choice of scales. [Total= 5 marks]

Question 33 :
A sprint runner was running a 100 meter race. 10 min before starting his run in the race, he was given 200 ml of 5% glucose solution. [Assume M.W. of glucose = 180.0]. [Total=5 marks]
I) Calculate how many moles of glucose was given to the sprinter. [1.5]
II) If 100% of the glucose molecules was absorbed into his body and were used for production of pyruvic acid, calculate the moles of pyruvic acid that will be produced from these glucose molecules. [0.5]
III) 25% of the total pyruvic acids generated from these glucose molecules are in muscle tissues and they subsequently form lactic acid. Calculate the total moles of lactic acid produced from these pyruvic acids. [0.5]
IV) If all the pyruvic acid generated (including the muscles and other parts of body) undergo aerobic oxidation to produce CO2 and water, calculate the total moles of CO2 produced from these pyruvic acid. [1.0]

V) The figure above represents a pictorial representation of components of a cell. Based on the information above predict the sites where these products are formed when glucose is metabolized by aerobic or anaerobic oxidation. [1.5]
i. The site of formation of pyruvic acid is _______________ in the cell.
ii. The site of lactic acid formation is ______________ in the cell.
iii. The site of oxidation of pyruvic acid for generation of end products such as CO2 and H2O is ___________.

Question 34 :
A stable carbon nucleus has 6 protons and 6 neutrons and a radius of 2.7 10-15 m. The six protons repel each other so that each proton experiences equal resultant force from the others which is also the minimum resultant repulsive force.
For the purpose of calculations, assume that the protons and neutrons are point particles and protons are point charges. Also assume that protons and neutrons get distributed inside or on the surface of sphere of radius given above. The nuclear force which gives nucleus its stability is NOT discussed in this question.

i) Draw a simple sketch or explain in few words the orientation of the protons in the nucleus when the above mentioned condition is satisfied. [1.0]
ii) Obtain the expression for the resultant repulsive force on one proton due to the remaining protons. [1.0]
iii) Calculate the magnitude of this resultant repulsive force. [1.0]
iv) Calculate the attractive gravitational force on this proton due to the remaining protons under the condition stated above. [1.0]
v) Calculate the approximate ratio of the repulsive electrostatic force to the attractive gravitational force. [0.5]
vi) What is the direction of the resultant electrostatic repulsive force on this proton? [0.5]

Question 35 :
A) Veeni thermally decomposed 90g of potassium chlorate of 60% purity. The total gas produced was allowed to react with hydrogen that was prepared by passing steam over hot magnesium metal. Calculate the amount of magnesium required to produce just sufficient hydrogen for completion of the reaction. [Total=2 marks]