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# INJSO 2020 Question Paper Indian National Junior Science : olympiads.hbcse.tifr.res.in

Organisation : Homi Bhabha Centre for Science Education
Exam Name : INJSO Indian National Junior Science Olympiad 2020
Document type : Question Paper

Contents :

## HBCSE INJSO Exam

Homi Bhabha Centre for Science Education, INJSO Indian National Junior Science Olympiad 2020 Question Paper

Related / Similar Question Paper : HBCSE INAO Question Paper 2020

## INJSO Question Paper

1) On a standard chess board with (8 * 8) squares, a chess piece starts to move from the lower left corner, which we shall label as square (1 * 1). This piece is allowed to move only upwards or rightwards. At any point, the piece cannot move downwards, leftwards or diagonally, e.g., from square (2 * 3), the piece may go towards (3 * 3) or (2 * 4) but not any other direction. If this piece continues to move only according to these rules, the number of dierent paths by which it can reach the square (4 * 4), starting from the square (1 * 1), is

A. 16
B. 18
C. 20
D. 24

2) In the balanced chemical equation of the thermal decomposition of lead(II) nitrate to lead(II) oxide, if the coecient of lead(II) nitrate is 2, then the coecient of nitrogen dioxide is
A. 1
B.
2 C.
3 D. 4

3) Metals react with oxygen to form metal oxides. If the metals considered are K, Cs, Mg and Sr, the correct order of the basic character of their oxides is
A. MgO>SrO>K2O>Cs2O
B. Cs2O<K2O<MgO<SrO
C. MgO<SrO<K2O<Cs2O
D. K2O<MgO<SrO<Cs2O

4) A more reactive metal displaces a less reactive metal from its salt solution. Observe the following gures in which a metal rod is suspended in 1M salt solution. At room temperature, the displacement reaction will significantly occur in

5) Soaps are sodium salts of fatty acids. Which of the following can be added to a pure soap to bring its pH to 7?
A. Lemon Juice
B. Common salt
C. Sodium Nitrate
D. Baking Soda

6) In case of diarrhea, oral rehydration salts (ORS) mixed with water is used as a simple therapy to rehydrate the patient. Rehydration occurs only if glucose and NaCl (both present in ORS) are added to water and given to the patient. Which of the diagrams given below correctly represents the initial steps in the working of ORS in the intestine?

7) Two populations of a land species were eectively isolated from each other for a long period of time. Which of the following would demonstrate that the two populations have evolved into separate species?
A. The two populations dier in at least ve morphological traits.
B. Sterile hybrids are produced when members of the two populations mate.
C. Organisms of both the populations do not willingly mate with each other.
D. DNA sequences are dierent for the two populations.

8) Chromophores are commonly used as biological stains to view cell organelles better. When an epithelial cell (e.g. skin cell) is stained with a basic dye like methylene blue and observed under a light microscope (total magnication of 100X), the visible cell organelle(s) will be
A. Blue nucleus and blue mitochondria.
B. Blue nucleus and blue endosomes.
C. Blue nucleus and pink mitochondria.
D. Blue nucleus.

9) Alleles are variant forms of a gene that are located at the same position, or genetic locus, on a chromosome. An allele frequency is calculated by dividing the number of times the allele of interest is observed in a population by the total number of all the alleles at that particular genetic locus in the population.

A cross is made between two pea plants, one bearing round seeds and the other bearing wrinkled seeds. All pea plants in the F1 progeny had round seeds. When the F1 progeny were self-pollinated and the F2 progeny analyzed, it was observed that 300 plants had round seeds while 100 plants had wrinkled seeds. What is the frequency of the dominant allele that is responsible for seed shape in the F2 progeny?

A. 25%
B. 50%
C. 75%
D. 100%

10) A 5 cm long needle is placed along the principal axis of a concave mirror of a focal length 10 cm. It is observed that one end of the image of the needle coincides with one of the ends of the needle. The other end of the image is at a distance x from the pole of the mirror, where x is
A. 20 cm
B. 50/3 cm
C. 30 cm
D. 10 cm