Q1. The main observations while experimenting with burning magnesium ribbon in the air are:
- Magnesium ribbon burns with a dazzling white flame.
- A white powder is formed.
- Magnesium ribbon vapourises.
- Aqueous solution of the white powder turns blue litmus to red.
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(C) (i) and (ii) |
| Q2. A metal, M, displaces iron from an aqueous solution of ferrous sulfate but fails to do so in the case of an aqueous solution of aluminum sulfate. The metal Mis |
(D) Zinc |
| Q3. A common feature observed in the crystals of washing soda, copper sulfate, gypsum, and ferrous sulfate is that all |
(C) have a fixed number of molecules of water of crystallization in one formula unit of these salts |
Q4. A metal, 'X', on treatment with sodium hydroxide liberates a gas 'G'. It also liberates the same gas, 'G' on treatment with dilute sulphuric acid.
Based on the above information, 'X' and 'G' respectively are |
(C) Zinc and Hydrogen |
Q5. The values of a, b, c, and d in the following balanced chemical equation are respectively: 2 R
a Pb(NO3)2 heat, b PbO + c NO2 + O2 |
(D) 2, 2, 4, 1 |
| Q6. During electrolytic refining of copper, the anode, the cathode and the electrolyte used respectively are |
(A) Impure copper, pure copper, acidified copper sulfate solution |
| Q7. If we make a carbon skeleton with four carbon atoms, the two different possible skeletons will be |
(B) C-C-C-C; C- C/CC |
Q8. Listed below are the steps of nutrition in Amoeba. Select the correct sequence of these steps:
- Diffusion of simple nutrients into cytoplasm
- Food vacuole formation
- Formation of finger-like temporary extensions of cell surface
- Complex substances are broken into simpler ones
- Undigested material thrown out of the cell surface
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(D) (iii), (iv), (i), (ii), (v) |
| Q9. Which among the following is not a neural action controlled by the part of the human brain labeled 'X' in the figure above? |
(D) Blood Pressure |
| Q10. The modes of reproduction in Spirogyra and Planaria respectively are |
(C) Fragmentation and regeneration |
| Q11. The plant hormones promoting rapid cell division in seeds and wilting of leaves respectively are |
(B) Cytokinins and Abscisic acid |
| Q12. In aerobic respiration, the steps are breakdown of glucose to pyruvate and its further conversion to carbon dioxide. Both processes respectively occur in - |
(D) Cytoplasm and Mitochondria |
| Q13. To obtain large images of the teeth of patients, the dentist holds the concave mirror in such a manner that the teeth are positioned |
(B) between the pole and the focus of the mirror. |
| Q14. A possible way to restore clear vision for those people whose eyeballs have elongated is the use of suitable |
(A) bifocal lens |
| Q15. The examples of natural and manmade (artificial) ecosystems are respectively |
(C) Lakes and gardens |
| Q16. Human activities that are affecting the environment are |
(B) excessive use of disposable cups and plates. |
Q17. Assertion (A): Silver chloride turns grey in sunlight.
(R) : Decomposition of silver chloride into silver and chlorine takes place by sunlight. |
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
Q18. Assertion (A): The embryo gets nutrition from the mother's blood with the help of a special tissue called the placenta.
Reason (R): Placenta is a disc which is embedded in the uterine wall. |
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). |
Q19. Assertion (A): The pattern of the magnetic field of a solenoid carrying a current is similar to that of a bar magnet.
Reason (R): The pattern of the magnetic field around a current-carrying conductor is independent of the shape of the conductor. |
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). |
Q20. Assertion (A): All organisms can make organic compounds like sugar and starch from inorganic substances using the radiant energy of the sun.
Reason (R): The organisms which can produce food by photosynthesis are called producers |
(C) Assertion (A) is true, but Reason (R) is false. |
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