PRACTICE PAPER - 5 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 | In optics an object which has higher optical density is called – (a) optically rarer (b) optically denser (c) optical density (d) refractive index |
Q2 | The change in the focal length of human eye is caused due to (a) ciliary muscles (b) pupil (c) cornea (d) iris |
| Q3 | When one unit of electric charge moves from one point to another point in an electric circuit, then the amount of work done in joules is known as ____________. (a) electric current (b) electric resistance (c) electric conductance (d) potential difference |
| Q4 | The device which works on the force experienced on a current carrying conductor placed in magnetic field is- (a) electric motor (b) ammeter (c) speaker (d) all of the above |
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 : A compass needle is placed near a current carrying wire. The deflection of the compass needle decreases when the magnitude of the current in the wire is increased. Reason: The strength of a magnetic field at a point near the conductor increases on increasing the current. |
| Q6 | Assertion : Some old people have difficulty seeing nearby objects as well as far away objects. Reason : The power of accommodation of the eye gradually decreases with ageing. |
SECTION B
Q7 to Q7 are very short answer questions
Q7 | (a) Which natural phenomenon is being shown here ?
(b) Identify the natural phenomenon marked at (a), (b) and (c). OR Why do stars seem higher than they actually are ? Illustrate your answer with the help of a diagram. |
SECTION C
Q8 to Q10 are short answer questions
Q8 | One half of a convex lens is covered with a black paper. (a) Show the formation of an image of an object placed at 2F, of such a covered lens with the help of a ray diagram. Mention the position and nature of the image. (b) Draw the ray diagram for the same object at the same position in front of the same lens, but now uncovered. Will there be any difference in the image obtained in the two cases? Give reason for your answer. |
Q9 | Your friend can read a book perfectly well but cannot read the writing on black-board unless she sits on the front row in class. (a) Which defect of vision is she covering from ? (b) List two possible causes of the defect ? (c) How can this defect be corrected ? |
Q10 | (a) State Ohm’s Law (b) Write the mathematical relation between V, I and R. (c) Draw the characteristic graph between V and I (d) Draw the experimental setup for the verification of Ohm’s law. OR Mrs Sujata constructed a new house. While setting up the domestic electric circuit in her house she is confused about the way wires and appliances are connected. (a) How are electric appliances connected in domestic circuits and why ? (b) List two safety measures that she must use in her domestic circuit? (c) What is a short-circuit ? |
SECTION D
Q11 to Q11 are long answer questions
Q11 | (a) Find the resistance of a bulb rated 40W, 220V. (b) Two bulbs 40W, 220V and 100W, 220V connected in parallel combination to a 220V source. (i) Draw a circuit diagram to show this. (ii) Determine the total current drawn from the power supply. (iii) Calculate the total power consumed by the circuit. |
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 | Andre Marie Ampere suggested that a magnet must exert an equal and opposite force on a current carrying conductor, which was experimentally found to be true. But we know that current is due to charges in motion. Thus, it is clear that a charge moving in a magnetic field experiences a force, except when it is moving in a direction parallel to it. If the direction of motion is perpendicular to the direction of magnetic field, the magnitude of force experienced depends on the charge, velocity (v), strength of magnetic field (B), and the length of the conductor in the magnetic field. (a) When an electron is moving upwards in a uniform magnetic field which is directed from left to right as shown in the figure, what will be the direction of force acting on this particle? (b) State the rule which you have used in the above question to determine the direction of force. (c) (i) State the condition under which an electron experiences maximum force moving in a uniform magnetic field. (ii) If the electron is replaced by a neutron, what will be the direction of force acting on it? OR (i) A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. Determine the direction of magnetic field. (ii) Name any two devices that use current carrying conductors and magnetic fields. |
