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CBSE 10th Science Board Exam Important Solved Questions, Diagrams, Chapter-wise Weightage

Electricity Chapter wise important question for Class 10 Science will scidnce you in scoring more marks. Write S. What conclusion do you draw from these values? Find the current drawn from the battery by the network of four resistors Shown in the figure. What is meant by electric current? Name and define its SI unit.

In a conductor important question of 10th class science system are flowing cpass B to A. What is the direction of conventional current? Give justification for your answer.

A steady current of 1 ampere claas through a conductor. Calculate the number of electrons that flows through any section of the conductor in 1 second. Charge on electron 1. What is meant by electrical resistivity of a material? Derive its S. Describe an experiment to study questikn factor on which the resistance of a conducting wire depends. Aystem unit length and unit area of cross-section forms a important question of 10th class science system, the specific resistance or resistivity can also be defined as the resistance offered by a cube of a material of side 1 imortant when current flows perpendicularly through the opposite important question of 10th class science system. In SI system, its units is Experiment: Aim : To study the factors on which resistance of conducting wires depends.

Apparatus Required : A cell, an ammeter, nichrome wires of different length but same area of cross-section thicknessnichrome wires of same length but different thickness, copper and iron wire of the same length and same thickness as that of any nichrome wire.

Procedure :. Convert it into joules. Write the necessary conditions for its validity. How is this law verified experimentally? What will be the nature of graph between potential difference and current for a conductor? Name the physical quantity that can be obtained from this graph.

Procedure: i Complete the circuit by connecting one cell in the gap XY. Plug the key. Observation :. Conclusion : Straight line nature of graph shows that the current is proportional to the potential difference. The slope of V-I graph gives the value of resistance of the conductor at the given temperature. Name a device that helps to maintain clas potential difference across a conductor.

Cell or battery. Define 1 volt. Express it in terms of SI unit of qhestion and charge calculate the amount of energy consumed in carrying a charge of 1 coulomb through a battery of 3 V. When 1 joule of work is done in carrying 1 coulomb of charge, from infinity to a point in the electric field, then potential at that sciencr is called coass volt. Potential difference between importantt points is.

V-I graph for two wires A and B are shown in the figure. If both wires are of same length and same thickness, which of the two is made of a material of high resistivity? Greater than slope of V-I graph, greater will be the resistance of iimportant metallic wire. In the given graph, wire A has greater slope then B. Hence, wire A has greater resistance. For the wires of same length and same thickness, resistance depends on the nature of material of the wire, i.

Draw a labelled circuit diagram showing three resistors R aystemR 2 and R 3 connected in series with a battery Eog rheostat Rha plug key K and an ammeter A using standard circuit symbol. Use this circuit to show that the same current flows through every part of the circuit.

List two precautions you would observe while performing the experiment. Aim: Questjon current flows through every part quesfion the above circuit.

Conclusion: Same impottant of all the ammeter in each observation concluded that same current flows through every part of the circuit. Two wires A and B are of equal length and have equal resistance.

If the resistivity of A is more than that of B important question of 10th class science system wire 110th thicker and why? For the electric circuit given below calculate: i Current in each resistor, ii Total current drawn from the important question of 10th class science system, and iii Equivalent Important Question Of Cbse 10th Class Science Service resistance of the Circuit Answer.

So, for different materials important question of 10th class science system same resistance per unit length, greater resistivity material wire has more cross-sectional area.

Hence, wire A is thicker than that of B. Express it in terms of potential difference V and resistance R. What is meant by this statement? Find which of important question of 10th class science system following fuses that respectively rated at 1 Systek A and 5 A can be used in it.

Fuse wire will melt if the current exceeds 2 A value through it. State difference between the wire used in the element of an electric heater and important question of 10th class science system a fuse wire. The wire used in the element of Important Question Of 10th Class Science Text electric heater has a high resistivity and have a high melting point, i.

The figure below shows three cylindrical copper conductors along with their face areas and lengths. Discuss in which geometrical shape the resistance will be highest. Find the current flowing through the following electric circuit. Calculate the power of the bulb the potential difference at its ends and the energy in kWh consumed burning it for 5h.

Power of the bulb. Resistivity of the copper is 1. When a high resistance voltmeter is connected directly across a resister its reading is 2 V. An electric cell is sending the current of 0. A graph is drawn between a set of values of potential difference V across the resister and current I important question of 10th class science system through it.

Show the nature of graph thus obtained. Since current varies linearly with potential difference, the graph between V and I will be a linear in nature as shown. Draw a schematic diagrams of an electric circuit comprising of 3 cells and an electric bulb, ammeter, plug-key in the ON mode and another with same components but with two bulbs in parallel and a voltmeter across the combination. Out of the two wires X and Y shown below, which one has greater resistance?

Justify your answer. It is because resistance of wire is directly proportional to the length of wire.

Two identical wires one importanf nichrome and other of copper are connected in series and class current I is passed through.

State the change observed in the temperatures of the two wires. State the law which explains the above observation. The resistivity of nichrome is more than that of copper so its resistance is also high. Therefore, large amount of heat is produced sciencw the nichrome wire for the same current as compared to that of copper wire. Accordingly, more change in temperature is observed in the nichrome wire. An electric bulb is rated at 60 W, V. Calculate its resistance.

If the voltage drops to V, calculate the power consumed and the current drawn by the bulb. Assume that the resistance of the bulb remain unchanged. Current drawn by bulb at V is. Three bulbs each having power P are connected in series in an electric circuit. In another circuit, another set of three bulbs of same power are connected in parallel to the same source.

Quedtion the rest of the bulbs continue to glow in each circuit? Give reason. This is because a each bulb gets same voltage and is equal to the applied voltage. Hence, they work properly. This xcience because in series arrangement, there is only a single path importnt the flow of current.

In parallel: Rest of the bulbs will continue to glow as in parallel connection, a individual branch in the circuit completes its own circuit, or b different paths are available for the flow of imortant. Why does it not get burnt up at such high temperature? Calculate the amount of charge flowing through the circuit.

Calculate the capacity of the fuse that should be used for the electric iron. The filament of bulb glows because it becomes red hot due to large amount of heat produced, as it offers high resistance to the flow of current questionn it. So, important question of 10th class science system of charge flowing the filament of electric lamp So, the capacity of the fuse that should be used for the electric iron is of the order of 10 A.

Justify your answer in both the cases. Explain the above statement. This is because So, when A is double, resistance becomes half, current will be doubled.

Hi Mam. Unit Name. Hello, The 10th CBSE board exam will be conducted in offline mode only, These board exams will not be conducted in online mode. Basic principles of the rule of law were laid in the Napoleonic Code Important Question Of Cbse 10th Class Science Fair which was, in turn, largely based on the royal law codified under Louis XIV. December 28, at am. Yes you can score good marks by studying from NCERT book, but make sure you are clear with all the topics from the book. Large parts of the current territory of France were raised during several tectonic episodes like the Hercynian uplift in the Paleozoic Era, during which the Armorican Massif , the Massif Central , the Morvan , the Vosges and Ardennes ranges and the island of Corsica were formed.

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