Practice paper · Bengaluru region

What is formed when zinc reacts with sodium hydroxide?

1. AZinc hydroxide and sodium
2. BSodium zincate and hydrogen gas
3. CSodium zinc-oxide and hydrogen gas
4. DSodium zincate and water

A student conducts an activity where he took ethanoic acid and ethanol in the presence of an acid catalyst. He noticed that the resulted product has some sweet-smelling fragrance. What is likely to be the product?

1. ACH3COOC2H5 + H2O
2. BCH₃COOH + H2O
3. CC₂H₅OH + H2O
4. DCOOH + H2O

Which of these series can be classified as homologous series?

1. ACHCl3, C2H5OH, C3H7OH
2. BCH3OH, C2H5OH, C3H7OH
3. CCHCl3, C4H9OH, CH3COOH
4. DCH3COOH, C4H9OH, C2H5OH

A student traces the path of a ray of light through a glass prism for different angles of incidence. He analyses each diagram and draws the following conclusion: (I)On entering prism, the light ray bends towards its base. (II) Light ray suffers refraction at the point of incidence and point of emergence while passing through the prism. (III) Emergent ray bends at certain angle to the direction of the incident ray. (IV) While emerging from the prism, the light ray bends towards the vertex of the prism. Out of the above inferences, the correct ones are:

1. A(I), (II) and (III)
2. B(I), (III) and (IV)
3. C(II), (III) and (IV)
4. D(I) and (IV)

Magnesium ribbon burns with a dazzling white light in air and form a white powder. Identify the chemical composition of white powder.

1. AMagnesium carbonate
2. BMagnesium oxide
3. CMagnesium nitrate
4. DMagnesium sulphate

Which of the following statement (s) is (are) true about the heart? (i)The left atrium receives oxygenated blood from different parts of the body while the right atrium receives deoxygenated blood from lungs (ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs (iii) Left atrium transfers oxygenated blood to the right ventricle which sends it to different body parts (iv) The right atrium receives deoxygenated blood from different parts of the body while the left ventricle pumps oxygenated blood to different parts of the body.

1. A(i)
2. B(ii)
3. C(ii) and (iv)
4. D(i) and (iii)

Which group of organisms do not constitute food chain?

1. (i)
   Grass, lion, rabbit, wolf
2. (ii)
   Plankton, man, fish, grasshopper
3. (iii)
   Wolf, grass, snake, tiger
4. (iv)
   Frog, snake, eagle, grass, grasshopper