Very Short Answer Type Questions (1 mark each)
Q. 1. Mention the angle between a current carrying conductor and magnetic field for which the force experienced by this current carrying conductor placed in magnetic field is largest. Ans. The angle between current carrying conductor and magnetic field is 90 deg. Q. 2. Mention the advantage of A.C. over D.C. for long distance transmission. Ans. A.C. can be easily transmitted over long distances without much loss of energy. Q. 3. In domestic electric circuit, with which wire do we connect a fuse ? Ans. Live wire. Q. 4. List any one point of difference between A.C. and D.C. Ans. Direct current always flows in one direction and alternating current reverses its direction periodically. Q. 5. Name the physical quantities which are indicated by the direction of thumb and forefinger in the Fleming s right hand rule ? Ans. Direction of motion of the conductor and direction of field. Q. 6. Name the device used to prevent damage to the electrical appliances and the domestic circuit due to overloading. Ans. Electric fuse. Q. 7. Name the type of current : (a) Used in household supply. (b) Given by a cell. Ans. (a) Alternating current 1/2 (b) Direct current. Q. 8. State the value of potential difference between the live wire and the neutral wire in our country. Ans. 220 V Q. 9. State the effect on the strength of magnetic field produced at a point near a straight conductor if the electric current flowing through it increases. Ans. The strength of the magnetic field increases. Q. 10. State a difference between the wires used in the element of an electric heater and in a fuse. Ans. The melting point of the wire used in heater elements is high while a fuse wire has low melting point. Q. 11. State the observation made by Oersted on the basis of his experiment with current carrying conductors. Ans. Every current carrying conductor has a magnetic field around it. Q. 12. Suggest one way of discriminating a wire carrying current from a wire carrying no current. Ans. Bring a magnetic needle near the wire, a current carrying wire will produce a deflection in the needle whereas a wire without current will not. Q. 13. List two sources of magnetic fields. Magnet, moving charges, electric current. (any two) State the effect of a magnetic field on the path of a moving charged particle Ans: It can deflect the path of the charged particle. Q.14. An alternating current has a frequency of 50 Hz. How many times does it change its direction in one second ? Ans: 100 times. Q.15. State the use of earth wire in domestic electric circuit. Ans: To ensure that any leakage of current to the metallic body of the appliance does not give shock to the user. Q.16. State the conclusions that can be drawn from the observation that a current carrying wire deflects a magnetic needle placed near it. Ans: A magnetic field exists around it. Read full papers
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Q1: Name the two components of peripheral nervous system? 1
Q2: What are hot spots inside the earth's crust? 1 Q3: A charge of 150 C flows through a wire in one minute. Find the electric current flowing through it.1 Q4: Explain why an aqueous solution of sodium sulphate is neutral while an aqueous solution of sodium carbonate is basic in nature. 2 Q5: When hydrogen gas is passed over heated copper (II) oxide, copper and steam are formed. Write the balanced chemical equation for this reaction and state: (i) the substance oxidised. (ii) the substance reduced in the reaction. 2 Q6: Why do herbivores have longer, smaller intestine than carnivores? 2 Q7: Select (i) combination reaction (ii) decomposition reaction and (iii)displacement reaction from the following chemical equations: i. ZnCO (s) ───→ ZnO (s) + CO (g) ii. Pb(s) + CuCl (aq) ───→ PbCl + Cu (s) iii. NaBr (aq) + AgNO (aq) ───→ AgBr (s) + NaNO (aq) iv. H (g) + Cl (g) ───→ 2HCl (g) 3 Q8: State the reason for the following: i. Lemon is used for restoring the shine of tarnished copper vessels. ii. A metal sulphide is converted into its oxide to extract the metal from the sulphide ore. Q9: State reason for the following: i. dry HCl gas does not change the colour of the dry blue litmus paper. ii. alcohol and glucose also contain hydrogen, but do not conduct electricity. iii. Concentration of H O+ ion is affected when a solution of an acid is diluted. 3 Q10: The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms. Give reason. State the pathway of air from nostrils to lungs in human beings. 3 Q11: State the kind of chemical reactions in the following examples: i. digestion of food in stomach ii. combustion of coal in air iii. Heating of limestone. 3 Q12: (a) State the formation of urine. (b) What will happen if there is no tubular reabsorption in nephrons of kidney? 3 Q13: Mention three characteristic features of hormonal secretions in human beings. 3 Q14: The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the material of the wire is 50 × 10-8 Ωm, find the length of wire. 3 Q15: A circuit has line a line of 5A. How many lamps of rating 40W; 220V can simultaneously run on this line safely?3 Q16: Show four different ways in which four resistors of r Ω each may be connected in a circuit. In which case is the equivalent resistance of the combination. (i) maximum (ii) minimum 3 Q17: Amit lives in Delhi. He is much concerned about the increasing electricity bill of his house. He took some steps to save electricity and suceeded in doing so. (i) Mention any two steps that Amit might have taken to save electricity. (ii) Amit fulfilled his duty towards the environment by saving electricity. How? (iii) Which alternative source of energy would you suggest Amit to use? 3 Q18: List any three qualities of an ideal source of energy. 3 Q19: Write balanced chemical equation for the following statements: (i) NaOH solution is heated with zinc granules. (ii) Excess of carbon dioxide gas is passed through lime water. (iii) Dilute sulphuric acid reacts with sodium carbonate. (iv) Egg shells are dropped in hydrochloric acid. (v) Copper (II) oxide reacts with dilute hydrochloric acid. 5 Q20: (a) Define corrosion (b) What is corrosion of iron called? (c) How will you recognise the corrosion of silver? (d) Why corrosion of iron is serious problem? (e) How can we prevent corrosion? 5 Q21: (a) Write three main features of the nervous system? (b) In the absence of muscle cells, how do plant cells show movement? 5 Q22: What is meant by resistance of a conductor? Name and define its SI unit? List the factors on which the resistance of a conductor depends. How is the resistance of a wire affected if: (i) its length is doubled, (ii) its radius is doubled? 5 Q23: (a) Draw magnetic field lines of a bar magnet. "Two magnetic field lines never interact with each other". Why? (b) An electric oven of 1.5 kW is operated in a domestic circuit (220V) that has a current rating of 5A. What result do you expect in this case? Explain. 5 Q24: (i) Establish a relationship to determine the equivalent resistance R of combination of three resistors R1, R2 and R3 connected in parallel. Q34: An iron nail is dipped in the solution of copper sulphate for about 30 minutes, state the change in colour observed. Give the reason for the change. 2 Q35: A student verifying Ohm's law computed the value of resistance of a resistor for each set of observation. However the values of the resistor were slightly different from the actual value. Is his experiment wrong? Justify your answer. Q36: Draw a labelled diagram of stomatal apparatus with closed stomatal pore. Label its different parts and show the directions of water flowing. 2 Solved SA-1( Sep_2015) Original Question papers Download Class X Acid Base and Salt Chapter Study Notes - 1 Download File
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