PRACTICE PAPER - 7 CLASS : X SUBJECT: SCIENCE (only PHYSICS question shown here) (Based on Full Syllabus) M.M.: 80 DURATION: 3 HRS |
GENERAL INSTRUCTIONS: (i) All questions are compulsory. (ii) The question paper has five sections and 12 questions. All questions are compulsory. (iii) Section–A has 4 MCQs and 2 assertion-reason type of 1 mark each; Section–B has 1 questions of 2 marks each; and Section–C has 3 questions of 3 marks each; Section–D has 1 questions of 5 marks each; Section–E has 1 case based question of 4 marks. (iv) Internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions. (v) For case study questions in section E, there is one choice in one subpart, with 3 questions based per case study. |
SECTION A (MCQs)
| Q1 | The most suitable material for making the core of an electromagnet is: (a) Iron (b) Soft iron (c) Steel (d) Aluminium |
Q2 | The front face of a circular loop of a wire is the North Pole. The direction of current in this face of the loop will be (a) clockwise (b) anticlockwise (c) towards north (d) towards south |
| Q3 | Select the INCORRECT statement stated below related to concave mirror (a) Outer surface is coated with opaque substance. (b) Inner surface is polished and thus reflective. (c) It is used to observe the phenomenon of refraction. (d) It is known as converging mirror. |
| Q4 | A person got his eye tested. The optician’s prescription for the spectacles was : Left eye : – 3 D Right eye : – 3.5 D The person is having a defect of vision called :
(a) presbyopia (b) myopia (c) hypermetropia (d) cataract |
Q5 to Q6 are assertion-reasoning based questions. These consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate options given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) A is false but R is true. |
| Q5 | Assertion : Refractive index has no units. Reason: The refractive index is a ratio of two similar quantities. |
| Q6 | Assertion : A 200 W bulb glows with more brightness than 100 W bulb. Reason : The resistance of 100 W bulb is more than 200 W bulb and thus it draws less current from the source. |
SECTION B
Q7 to Q7 are very short answer questions
Q7 | Draw a diagram to show the pattern of magnetic field lines around a bar magnet. OR List any two properties of magnetic field lines. |
SECTION C
Q8 to Q10 are short answer questions
Q8 | Rohan went to a palmist to show his palm. The palmist used a special lens for this purpose. (a) Name the type of lens and reason for its use. (b) If the focal length of this lens is 10 cm and the lens is held at a distance of 5 cm from the palm, use lens formula to find the position and size of the image. |
Q9 | (a) State the relation between colour of the scattered light and size of scattering particle. (b) The apparent position of an object when seen through the hot air, fluctuates or waves. State the basic cause of this observation. (c) Draw a ray diagram to show that spectrum obtained a prism can be recombined again by placing an identical prism inverted to the first prism. |
Q10 | (a) Two wires of equal length, one of copper and the other of nichrome (an alloy) have the same thickness. Which one can be used for (i) electrical transmission lines (ii) electrical heating devices? Why? (b) Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is 6 Ω. OR Study the circuit given below and find out :
(a) The equivalent resistance of the circuit. (b) Current in 12 Ω and 24 Ω resistor. (c) Difference in the reading of ammeter A1 and A2, if any. |
SECTION D
Q11 to Q11 are long answer questions
Q11 | (a) State Fleming’s left hand rule. (b) List three characteristics of the electric current used in our homes. (c) What is a fuse? Why is it called a safety device? (d) Why is it necessary to earth metallic electric appliances? |
SECTION E
Q12 to Q12 are case-based / data-based questions with 2 to 3 short sub-parts.
Internal choice is provided in one of these sub-parts
Q12 | The hotter air is lighter (less dense) than the cooler air above it, and has a refractive index slightly less than that of the cooler air. Since the physical condition of the refracting medium (air) are not stationary, therefore, the light goes from rarer medium to denser medium in atmosphere. (a) What is atmospheric refraction ? (1) (b) Name two phenomenon related to atmospheric refraction (1) (c) Draw a well labelled diagram to show any one phenomenon related to atmospheric refraction (2) OR (c) Explain why the planets do not twinkle? |
