SUMMATIVE ASSESSMENT-II SCIENCE Time : 3 hours Maximum Marks: 80
SECTION-A
3. An object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. Find (I) the position (ii) the magnification and (iii) the nature of the image formed. OR 4. One half of a convex lens is covered with a black paper. Will such a lens produce an image of the complete object? Support your answer with a ray diagram. 5. An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm. 1. Draw the ray diagram and 2. Calculate the position and size of the image formed. 3. What is the nature of the image.
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Guess questions term-2 Science IX SUBJECT- PHYSICS
Q1: What is the relation between speed of sound, frequency and wavelength? Q2: Which travels faster sound of light, also discuss the speed of fastest one In solids, liquids and solids? Q3: A source of wave produces 20 crests and 20 troughs in 0.2s. Find the Frequency of the wave? Q4: Will a vibrating source always produce sound? Q5: What are supersonics, infrasonic and ultrasonic waves? Q6: Can sound waves travel through vacuum? Q7: Does the sound of a bomb explosion travel faster than the sound produced By a humming bee? Q8: If an observer places his ear at the end of a long pipe, he can hear two Distinct echoes when the pipe is hammered at the other end. Explain. Q9: A ship sends out ultrasound that results from the seabed and is detected After 3.42s. If the speed of ultrasound through sea water is 1531m/s. , what is the distance of the sea bed from the ship? Q10:What is density? Give its units. Q11: A force of 15N is uniformly distributed over an area of 150m2. Find pressure In Pascal? Q12: Differentiate between mass and weight? Q13: What is the relation between thrust and pressure? Q14: What is the relation between acceleration due to gravity and Gravitational Constant? Q15: What happens to a body when the density of a body is equal to the density of the liquid? Q16: A body of mass 2kg floats in a liquid, what is the buoyant force on the body? 17Q: A coolie carries a load of 50kg on his head and walks on a level road up to 100m.What is the work done by him? 18 Q: Give units of Power, Work and Energy? 19 Q: What is the commercial unit of energy? 20Q:Two bodies have their masses m1/m2 =3 and their kinetic energy E1/E2=1/3 .The ratio of their velocities are? 21Q:Prove that P=F * v , where P is power, F is force and v is velocity? 22Q:An electric motor creates a tension of 4500N in hoisting a cable and reels at a rate of 2m/s. The Power of the motor is? 23 Q: State Work Energy theorem? 1. If 4a2x2 + 4abx + = 0 has equal roots of x, then find the value of k.
2. Two positive numbers differ by 3 and their product is 504. Find the numbers. 3. The length of a tangent from a point A at a distance 5 cm from the centre of the circle is 4 cm. Find the diameter of the circle. 4. Two tangents PQ and PR are drawn from an external point P to a circle with centre O. Prove PROQ is a cycle quadrilateral. 5. Determine the ratio in which the point P(x, -2) divides the join of A(-4, 3) and B(2, -4). Also find the value of x. 6. Area of a sector of a circle of radius 36 cm is 54p cm2. Find the length of corresponding arc of sector. 7. Two cubes each of edge 4 cm are joined face to face. Find the surface area of the resulting cuboid. 8. A dice is thrown once. Find the probability of getting: (a) a prime number (b) a number divisible by 2Find the sum of all two digit positive numbers divisible by Question numbers 19 to 28 carry 3 marks each. 9. In an A.P. the first term is 24, the last term is 29 and the sum of all its term is 150. Find its common difference. 10. For what values of k does (k-12)x 2 + 2(k-12)x + 2= 0 has equal roots ? X Maths guess questions for CBSE board exam March 2012 Q. 20.Find three numbers in an A.P. whose sum is 15 and product 80
Q. 21 How many terms of A.P. 22, 20, 18, . . . . . . . . should be taken so that their sum is zero? Q. 22 Find the sum of odd positive integers less than 199. Q. 23 How many two digits numbers between 3 and 102 are divisible by 6? Q. 24 If 7 times the 7thterm is equal to 11 times the 11th term of an A.P. Find its 18th term. Q. 25 Which term of A.P. 13, 21, 29, . . . . . . will be 48 less than its 19th term? Q. 26 Find the A.P. whose 3rd term is –13 and 6th term is +2. Q. 27 Find the A.P., whose 5th term is 23 and 9th term is 43. Q. 28 The angles of a triangle are in A.P. If the smallest angle is one fifth the sum of other two angles. Find the angles. Q. 29 Aditi saved Rs. 500 in the first month of a year and then increased her monthly savings by Rs. 50. If in the nth month, her monthly savings become Rs 1000. Find the value of 'n'. Q. 30 The sum of first n terms of an A.P. is 2n2 + n . Find nth term and common deference of the A.P. Q. 31 The sum of 3rd and 7th terms of an A.P. is 14 and the sum of 5th and 9th terms is 34. Find the first term and common difference of the A.P. Q. 32. Find the sum of the first 30 terms of an A.P., whose nth term is 2–3n. If mth and nth terms of an A.P. are 1/n and1/m respectively, then find the sum of mn terms Q. 33 If mth , nth and rth terms of an A.P. are x, y and z respectively, then prove that :- m( y – z) + n(z – x) + r (x – y) = 0 Q. 34. If the roots of the equation a(b – c) x2 + b(c – a) x + c (a – b) = 0 are equal, then show that 1/a , 1/b , 1/c are in A.P. Q. 35. If the sum of m terms of an A.P. is n and the sum of n terms is m, then show that sum of (m +n) terms is – ( m + n). Download documents Visit Arithmetic Progressions |
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