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Class 12 Wave Optics Solutions are the most crucial topic in the Class 12 Physics syllabus as it carries maximum marks in the exams. The critical questions from the chapter which often come in the exam are enlisted and also answered comprehensively by the experts.
In this chapter, students can get a clear concept about reflection and refraction laws and the Huygens principle and all principles and phenomena which are approved by the principle of Huygens. Students will be able to get a firm grip on theoretical knowledge, it will enhance the mathematical abilities of a student.
The derivation and calculation are explained step-by-step that will help to understand every step of calculations. It will enable students to perceive the chapter better and also enable them to understand the concept of the Wave Optics along with all principles.
They cover all exercises given below:. Refraction of a Plane Wave. Refraction At a rarer medium. Ex - Resolving Power of Optical Instruments. The Validity of Ray Optics. All of these solutions are written while keeping CBSE guidelines Ncert Solutions Of Class 10th Geography Chapter 7 Visa in mind.
These solutions are available in PDF format and can be downloaded by anyone at any time. Answer: Since all the resistors are in series, the same current, 0. Question Several electric bulbs designed to be used on a V electric supply line, are rated 10 W.
Question A hot plate of an electric oven connected to V line has two resistance coils A and B, each of 24 Q resistance, which may be used separately, in series, or in parallel.
Question Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. Question An electric heater of resistance 8 f2 draws 15 A from the service mains 2 hours. Question Explain the following. Answer: a It has high melting point and emits light at a high temperature. Each of them dissipates energy and can withstand a maximum power of 18 W without melting. Find the maximum current that can flow through the three resistors.
Question 2: Should the resistance of an ammeter be low or high? Give reason. Answer: The resistance of an ammeter should be low so that it will not disturb the magnitude of current flowing through the circuit when connected in series in a circuit.
Question 3: How does use of a fuse wire protect electrical appliances? Answer: The fuse wire is always connected in series with the live wire or electrical devices. If the flow of current exceeds the specified preset value due to some reason, the heat produced melts it and disconnects the circuit or the device from the mains. In this way, fuse wire protects the electrical appliances. Question 4: What is electrical resistivity? In a series electrical circuit comprising a resistor made up of a metallic wire, the ammeter reads 5 A.
The reading of the ammeter decreases to half when the length of the wire is doubled. Answer: The resistance offered by a metallic wire of unit length and unit cross-sectional area is called electrical resistivity.
Hence, when the length of wire is doubled, the resistance becomes double and current decreases to half. Calculate the resistance of the electric lamp. Question 6: Why is parallel arrangement used in domestic wiring?
Answer: Parallel arrangement is used in domestic wiring because i Each appliance gets the same voltage as that of the mains supply. Question 7: B 1, B 2 and B 3 are three identical bulbs connected as shown in figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. Answer: i Since B 1 ,B 2 and B 3 are in parallel, the potential difference across each of them will remain same.
So when the bulb B 1 gets fused, B 2 and B 3 have the same potential and continues with the same energy dissipated per second, i. Question 1: Three incandescent bulbs of W each are connected in series in an electric circuit. In another circuit, another set of three bulbs of the same wattage are connected in parallel to the same source.
Justify your answer. Will the rest of the bulbs continue to glow in each circuit? Answer: a The bulbs in the two circuits will not glow equally bright as the current through them is not the same.
While the rest of bulbs in parallel circuit will continue to glow without getting disturbed because in parallel combination, current gets additional paths to flow. Question 2: Find out the following in the electric circuit given in figure: Answer: e No difference, since the ammeters are connected in series and same current will pass through them, so reading of both ammeters will be same.
Question 1. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown in the diagram. But he did not succeed to achieve the objective. Question 2. For the given circuit, name the components which are connected in parallel. Because terminals of the resistance and voltmeter are connected together. Question 3. A student arranges the following circuit to get equivalent resistance of a series combination of two resistors R 1 and R 2.
Which one of the following statements will be true for this circuit [CCE ] a It gives incorrect reading for current I as well as potential difference V b It gives correct reading for current I but incorrect reading for potential difference V c It gives correct reading for potential difference V but incorrect reading for current I d It gives correct reading for both I and V Answer: b The voltmeter should be connected across the components of and R 2 to give correct Ncert Solutions For Class 10th History Chapter 2 Visa reading for potential difference.
Question 4. An ammeter has 20 divisions between 0 mark and 2A mark on its scale. The least count of ammeter is a 0. Question 5. A student finds that there are 20 divisions between zero mark and 1V mark of a voltmeter. The least count of voltmeter is a 0. Question 6. The current flowing through a resistor connected in an electric circuit and the potential difference applied across its ends are shown in figure alongside. Question 7. Question 8. In an experiment on studying the dependence of the current I flowing through a given resistor on the potential difference V applied across it, a student has to change the value of the current.
For doing this, he should change the a number of cells used b resistor itself c ammeter used in the circuit d Voltmeter used in the circuit Answer: a If we change the number of cells in electric circuit, the potential difference will change and as a result current flowing in the circuit changes.
Question 9. A milliammeter had graduations marked 0, , , , and The space between 0 mark and mark is divided into 20 divisions. Question To determine the eguivalent resistance of two resistors connected in series, a student prepared two electric circuits, correct reading of ammeter in the circuits is [CCE ] a In circuit I, 1. When parallel resistors are of three different values, the potential difference across its terminals is [CCE ] a greatest across smallest resistance b greatest across largest resistance c equal across each resistance d least across the smallest resistance Answer: c Potential difference across each resistor is same in Ncert Solutions Class 10th Physics Chapter Light Kit parallel combination of resistors.
Charge Something associated with the matter due to which it produces and experiences electric and magnetic effects. Resides on the outer surface of the conductor. Types of Current Direct Current Current whose magnitude and direction does not vary with time.
Alternating Current Current whose magnitude and direction periodically changes with time. Resistance R : Obstruction offered to flow of electrons.
After stretching, if length increases by n times then resistance will increase by n 2 times i. Electric Circuit The arrangement of various electrical components along which electric current flow. Heating Effect of Electric Current As current flows through a conductor, the free electrons lose energy which is converted into heat. Elements of Circuit Cell Direct current source of electromotive force. Combination of two or more cells is called battery.
Rheostat Wire of special type of alloy like manganin, Eureka, nichrome, etc. It controls the current in the electric circuit. Switch It is used to close or open the electric circuit, controls the movement of electrons in a circuit. Voltmeter Measures the potential difference between two points in the circuit. Its resistance is high and it is used in parallel with the resistance wire. Fuse It is a safety device having very thin wire which is made up of either tin or alloy of tin and lead.
This wire has low melting point so it melts and breaks the circuit easily if the current in the circuit exceeds. Ammeter Measures the value of current flowing in the circuit. The resistance of ammeter is small and it is used in series with the circuit.
LED It is a device which glows even if a weak electric current is allowed to flow through it. If you have any doubt regarding this article or NCERT Solutions For Class 10 Science Chapter 12 Electricity, leave your comments in the comment section below and we will get back to you as soon as possible.
Page Number: Question 1 On what factors does the resistance of a conductor depend? Answer: Advantages of connecting electrical devices in parallel with the battery are : In parallel circuits, if an electrical appliance stops working due to some defect, then all other appliances keep working normally. In parallel circuits, each electrical appliance has its own switch due to which it can be turned on turned off independently, without affecting other appliances.
In parallel circuits, each electrical appliance gets the same voltage V as that of the power supply line. In the parallel connection of electrical appliances, the overall resistance of the household circuit is reduced due to which the current from the power supply is high. Page Number: Question 1 Why does the cord of an electric heater not glow while the heating element does? When it is operated on V, the power consumed will be : a W b 75 W c 50 W d 25 W Answer: d 25 W Question 4 Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference.
The ratio of heat produced in series and parallel combinations would be : a 1 : 2 b 2 : 1 c 1 : 4 d 4 : 1 Answer: c 1 : 4 Question 5 How is a voltmeter connected in the circuit to measure the potential difference between two points?
The equivalent resistance is ii When we connect a series combination of R 1 and R 2 in parallel with R 3 , as shown in Fig. NCERT Solutions for Class 10 Science Chapter 12 Electricity Electric current, potential difference and electric current, Ohms law, Resistance, Resistivity factors on which the resistance of a conductor depends; Series combination of resistors, parallel combination of resistors; and its application on daily life; Heating effect of Electric current, electric Power, Interrelation between P, V, and R.
Page Question 1: Name a device that helps to maintain a potential difference across a conductor. Answer: Question 2: Redraw the circuit of the above question, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the voltage across the 12 resistor.
Answer: Question 3: What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series?
Answer: Advantages of connecting electrical devices in parallel: When the appliances are connected in parallel with the battery, each appliance gets the same potential difference as that-of battery which is not possible in series connection. Each appliance has different resistances and requires different currents to operate properly. This is possible only in parallel connection, as in series connection, same current flows through all devices, irrespective of their resistances.
If one appliance fails to work, other will continue to work properly. Page Question 1: Why does the cord of an electric heater not glow while the heating element does?
Answer: Question 3: An electric iron of resistance 20 Q takes a current of 5 A. When it is operated on V, the power consumed will be a W b 75 W c 50 W d 25 W Answer: Question 4: Two conducting wires of same material and of equal lengths and diameters are first connected in series and then parallel in a circuit across the same potential difference.
The ratio of heat produced in series and parallel combinations would be a b c d Answer: Question 5: How is a voltmeter connected in the circuit to measure the potential difference between two points? Answer: Question 7: The values of the current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below: Plot a graph between V and I and calculate the resistance of that resistor.
Answer: Question 8: When a 12 V battery is connected across an unknown resistor, there is a current of 2. Answer: Question 9: A battery of 9 V is connected in series with resistors of 0. Answer: Since, N bulbs of power P each connected in parallel will make the total power of NP, Question A hot plate of an electric oven connected to V line has two resistance coils A and B, each of 24 Q resistance, which may be used separately, in series, or in parallel.
Answer: Question Two lamps, one rated W at V, and the other 60 W at V, are connected in parallel to electric mains supply. Answer: Question Explain the following. Answer: Question 2: Should the resistance of an ammeter be low or high? Answer: Question 6: Why is parallel arrangement used in domestic wiring? Long Answer Type Questions Question 1: Three incandescent bulbs of W each are connected in series in an electric circuit. Using n conductors of equal resistance, the number of possible combinations is 2 n If the resistances of n conductors are totally different, then the number of possible combinations will be 2 n.
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