CBSE MCQ’s TEST PAPER -1
CLASS - X Science: Magnetic Effects of Currents 1. When a bar magnet is broken into two pieces: (A) we will have a single pole on each piece (B) each piece will have two unlike poles (C) each piece will have two like poles (D) None of these 2. The magnetic field intensity produced due to a current carrying coil is maximum at : (A) any point (B) the centre of the coil (C) any point lying on the axis of the coil (D) points lying between centre of the coil and its circumference 3. The direction of magnetic lines of force produced by passing a direct current in a conductor is : (A) Perpendicular to the conductor & coming outwards (B) parallel to conductor (C) Surrounding the conductor and of circular nature (D) perpendicular to the conductor & coming inwards 4. Which of the following statement is not correct about two parallel conductors carrying equal currents in the same direction ? (A) Each of the conductors will experience a force. (B) The two conductors will repel each other. (C) There are concentric lines of force around each conductor. (D) Each of the conductors will move if not prevented from doing so. 5. Which of the following determine the direction of magnetic field due to a current carrying conductor ? (A) Faraday’s laws of electromagnetic induction. (B) Fleming’s left-hand rule. (C) Lenz’s law. (D) Maxwell’s cork screw rule. 6. A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then : (A) a current will be induced in the coil (B) no current will be induced in the coil. (C) only emf will be induced in the coil (D) am emf and current both will be induced in the coil X Magnetic Effects of Currents MCQ'S - I (10Q) Download File X Magnetic Effects of Currents MCQ'S - 2 (10Q) Download File X Magnetic Effects of Currents Notes Visit....... X Magnetic Effects of Currents CBSE Test Paper - 1 Download File X Magnetic Effects of Currents CBSE Test Paper - 2 Download File
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HOTS QUESTIONS
1. In one of the industrial process used for manufacture of sodium hydroxide, a gas ‘X’ is formed as by – product. The gas ‘X’ reacts with lime water to give a compound ‘Y’ which is used as a bleaching agent in chemical industry. Identify ‘X’ and ‘Y’ giving the chemical equation of the reaction. Ans: In the manufacture of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by products. When chlorine gas (X) reacts with lime water, it forms calcium oxy chloride (bleaching powder) Y. 2NaCl (aq) + 2 H2O (L)----> 2NaOH (Aq) + Cl2 (G) + H2 (G) ‘X’ Þ Cl2 gas Ca(OH)2 + Cl2----> CaOCl2 + H2O Q. Dry hydrogen chloride gas does not turn blue litmus, whereas hydrochloric acid does. Why? Ans: In the dry state, hydrogen chloride (HCl) does not release H+ ions. Therefore, it cannot behave as an acid. When dissolved in water, it forms hydrochloric acid. It dissociates to give H+ ions in solution and behaves as an acid. Acid when react with metals release hydrogen gas but there is one acid which when reacts with metals does not release hydrogen except for two metals. Prove this statement. Acid + Metal ----> Salt + Hydrogen e.g. 2HCl + 2Na ---->2NaCl + H2 H2SO4 + 2Na ----> Na2SO4 + H2 HNO3 + Na ---->No hydrogen gas. Because nitric acid is strong oxidising agent. Nitric acid reacts only with Mg and Mn to give hydrogen gas. Mg + 2HNO3 ----> Mg(NO3)2 + H2 Mn + 2HNO3---->Mn(NO3)2 + H2 Self Practice Q. 4 Name the properties responsible for the following uses of baling powder. (i) Baking industry (ii) As an antacid (ii) As soda-acid fire extinguisher. Q. 5 What is meant by water of crystallisation of a substance? What is its importance? Q. 6 What effect does an increase in concentration of ‘H’ ions in a solution have on the pH of a solution Q. 7 Fresh milk has a pH Of 6. When it changes to curd, will its pH value increase or decrease? Why? Q. 8 How does the flow of acid rain water into a river make the survival of aquatic life in a river difficult? Q. 9 Arrange in the increasing order of their pH values: NaOH solution, Blood, Lemon juice, Q. 10 Two solutions A and B have pH values of 5 and 8 respectively. Which solution will be basic in nature? For more stuff visit ...... Question 1: What is a good source of energy? Answer: A good source of energy fulfils the following criteria: (I)It produces a lot of heat per unit mass. (II) It does a huge amount of work per unit mass. (III) It is easily accessible. (IV) It is easy to store and transport. (V)It is economical. (VI)It produces less amount of smoke. Question 2: What is a good fuel? Answer: A good fuel produces a huge amount of heat on burning, does not produce a lot of smoke, and is easily available. Question 3: If you could use any source of energy for heating your food, which one would you use and why? Answer: Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning. Question 4: What are the disadvantages of fossil fuels? Answer: The disadvantages of fossil fuels are as follows: (a) Burning of coal and petroleum produces a lot of pollutants causing air pollution. (b) Fossil fuels release oxides of carbon, nitrogen, sulphur, etc. that cause acid rain,which affects the soil fertility and potable water. (c) Burning of fossil fuels produce gases such as carbon dioxide that causes global warming. Question 5: Why are we looking at alternate sources of energy? Answer: Fossil fuels, which have been traditionally used by human beings as an energy sources, are non-renewable sources of energy. These sources of energy are limited and cannot replenish on their own. They are being consumed at a large rate. If this rate of consumption continues, then the fossil fuels would be exhausted from the Earth. Therefore, we have to conserve the energy sources. Hence, we should look for alternate sources of energy. Download full File 10th Chapter : Source of Energy Notes and MCQ's Download File 10th Ch: Source of Energy Guess Questions Solved Download File X Phy:Sources of energy Imp. ques with solution Download File X Physics:Chapter : Sources of Energy worksheet Download File 10th Chapter : Source of Energy Notes and MCQ's Download File The term "magnetic effects of current " means that " a current flowing in a wire produces a magnetic field round it ". the magnetic effect of current was discovered by Oersted found that a wire carrying a current was able to deflect a magnetic needle. It concludes that a current flowing in a wire always gives rise to a magnetic field round it. Magnetic field. The region around a magnet where the force of attraction or repulsion can be detected is called magnetic field. Magnetic field around a magnet can be detected by using a magnetic compass. Magnetic field lines :- Magnetic field lines are the paths around a magnet along which the north pole of a magnetic compass needle tends to move. The magnetic field lines around a magnet can be observed by sprinkling iron filings around a magnet. It can also be observed by moving a magnetic compass around a magnet. i) The magnetic field lines emerge at the north pole and merge at the south pole. ii) The magnetic field lines are closer at the poles. iii) The magnetic field lines do not intersect each other.Magnetic field due to a current carrying conductor :-If a magnetic compass is placed near a conductor carrying current (wire), the needle is deflected. This shows that a conductor carrying current has a magnetic field around it. If the direction of the current is from north to south, the deflection of the magnetic needle is towards the east.If the direction of the current is from south to north, the deflection of the needle is towards the west. The magnetic field around a current carrying straight conductor is in concentric circles. It can be observed by passing a current carrying straight conductor through a cardboard and sprinkling iron filings on it. Related search: X Magnetic Effects of Currents Notes Download File X Magnetic Effects of Currents CBSE Test Paper - 1 Download File X Magnetic Effects of Currents CBSE Test Paper - 2 Download File X Magnetic Effects of Currents CBSE Test Paper - 3 Download File X Magnetic Effects of Currents assignment for FA - 1 Download File X Magnetic Effects of Currents assignment For SA - 2 Download File CLASS X SCIENCE CHEMICAL REACTIONS AND EQUATIONS (solved questions) 1 – Mark questions answer 1. What happens when magnesium ribbon burns in air? Ans. When magnesium ribbon burns in air, it combines with the oxygen to form magnesium oxide. 2Mg(s) + O2(g) -----> 2MgO(s) 2. Name the gas evolved when zinc reacts with dil. HCl. Ans. Hydrogen gas is evolved. 3. What is a chemical equation? Ans. A chemical equation is a symbolic notation that uses formulae instead of words to represent a chemical equation. 4. On what chemical law, balancing of chemical equation is based? Ans. Balancing of a chemical equation is based on the law of conservation of mass. 5. Represent decomposition of ferrous sulphate with the help of balanced chemical equation. Ans. 2FeSO4(s) -----> Fe2O3(s) + SO2(g) + SO3(g) 6. When carbon dioxide is passed through lime water, it turns milky, why? For full Question and solution X chemical reactions equations_solved questions Download File Related posts and downloadable file X Chemical reactions and equations key consents Download X Chemical Reaction and Equation [Solved Questions] Download X Questions for Formative assessments Download 10th Chemical and chemical Equations (13 pages visit blog Click ) X Chemical reactions and Chemical Equation:FA Evaluation Assignments Solved X Chem. React.and Eq. NCERT solution Download File Chemical reactions and equations Activity Based Question Read and Practice |
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