Physics Question for revision 1. State any two properties of magnetic field lines. 2. What is a magnetic field ? How can the direction of magnetic field lines at a place be determined ? 3. Explain why, two magnetic field lines do not intersect each other. 4. State and explain Maxwell’s right-hand thumb rule. 5. Draw the magnetic lines of force due to a circular wire carrying current. 6. In the straight wire A, current is flowing in the vertically downward direction whereas in wire B the current is flowing in the vertically upward direction. What is the direction of magnetic field : (a) in wire A ? (b) in wire B ? Name the rule which you have used to get the answer. 7. A thick wire is hanging from a wooden table. An anticlockwise magnetic field is to be produced around the wire by passing current through this wire by using a battery. Which terminal of the battery should be connected to the : (a) top end of wire ? (b) bottom end of wire ? Giv...

Mathematics Question for revision | Area Related to circle There will be 10 questions and timing will be 1 hour. 1. Find the area of a quadrant of a circle whose circumference is 22 cm. 2. The length of the minute hand of a clock is 14 cm. Find the area swept by the minute hand in 5 minutes. 3. A chord of a circle of radius 15 cm subtends an angle of 60° at the centre. Find the areas of the corresponding minor and major segments of the circle. 4. A car has two wipers which do not overlap. Each wiper has a blade of length 25 cm sweeping through an angle of 115°. Find the total area cleaned at each sweep of the blades. 5. To warn ships for underwater rocks, a lighthouse spreads a red coloured light over a sector of angle 80° to a distance of 16.5 km. Find the area of the sea over which the ships are warned.(Use π = 3.14) 6. A horse is tied to a peg at one corner of a square shaped grass field of side 15 m by means of a 5 m long rope (see Fig below). Find (i...

Mathematics Question for revision | Coordinate Geometry There will be 10 questions and timing will be 1 hour. 1. Find the area of a rhombus if its vertices are (3, 0), (4, 5), (– 1, 4) and (– 2, – 1) taken in order 2. Find the coordinates of the points which divide the line segment joining A(– 2, 2) and B(2, 8) into four equal parts. 3. Find the coordinates of a point A, where AB is the diameter of a circle whose centre is (2, – 3) and B is (1, 4). 4. If A and B are (– 2, – 2) and (2, – 4), respectively, find the coordinates of P such that AP = (3/7)AB and P lies on the line segment AB. 5. If (1, 2), (4, y), (x, 6) and (3, 5) are the vertices of a parallelogram taken in order, find x and y 6. If the points A(6, 1), B(8, 2), C(9, 4) and D(p, 3) are the vertices of a parallelogram, taken in order, find the value of p 7. In what ratio does the point (– 4, 6) divide the line segment joining the points A(– 6, 10) and B(3, – 8)? 8. Determine if the point...

Mathematics Question for revision | Triangle Question There will be 10 questions and timing will be 1 hour. 1. Fill the follwoing with right answer : a) All circles are _____________. (congruent, similar) b) All ___________ triangles are similar. (isosceles, equilateral) c) Two polygons of the same number of sides are similar, if (a) their corresponding angles are ______________ and (b) their corresponding sides are ______________ proportional) 2. To prove : If a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, the other two sides are divided in the same ratio. 3. To Prove : If a line divides any two sides of a triangle in the same ratio, then the line is parallel to the third side. 4. ABCD is a trapezium with AB || DC. E and F are points on non-parallel sides AD and BC respectively such that EF is parallel to AB.Show that AE/ED =BF/FC. . 5. The diagonals of a quadrilateral ABCD intersect eac...

Physics Question for revision Give The reason For following Question : 1. Why is the series arrangement not used for domestic circuits? 2. How does the resistance of a wire vary with its area of cross-section? 3. Why are copper and aluminium wires usually employed for electricity transmission? 4. Explain why, filament type electric bulbs are not power efficient. 5. State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reasons for your answer. Numericals : 1. A wire that has resistance R is cut into two equal pieces. The two parts are joined in parallel. What is the resistance of the combination ? 2. An electric motor takes 5 amperes current from a 220 volt supply line. Calculate the power of the motor and electrical energy consumed by it in 2 hours. 3. Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in pa...

Physics Question for revision Give The reason For following Question : 1. Why is the tungsten used almost exclusively for filament of electric lamps? 2. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal? 3. Why does the cord of an electric heater not glow while the heating element does? 4. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? 5. Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source? Why? Numericals : 1. An electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V battery. Calculate (a) the total resistance of the circuit, (b) the current through the circuit, and (c) the potential difference across the electric lamp and conductor. 2. A wire of given material ha...