Model Paper — Objective Type
Max. Marks: 12 Time allowed: 15 Min.
Note: Four possible answers A, B, C and D to each question are given. Choose the correct answer and fill the corresponding circle in the answer book. Cutting or filling two or more circles will result in zero mark in that question.
1. Select the correct answer. (1 × 12 = 12)
(i) The latent heat of vaporization of water is: (a) 2.26 × 10⁶ J (b) 2.26 × 10⁶ J kg⁻¹ (c) 2.26 × 10⁵ J (d) 2.26 × 10⁵ J kg⁻¹
(ii) The natural phenomenon caused by convection currents is: (a) Earthquakes (b) Land and sea breezes (c) Magnetic fields (d) Solar eclipses
(iii) Which of the following wave types requires a medium to travel? (a) X-rays (b) Light waves (c) Radiowaves (d) Sound waves
(iv) What is the approximate speed of sound in air? (a) 150 m s⁻¹ (b) 330-350 m s⁻¹ (c) 500 m s⁻¹ (d) 1,000 m s⁻¹
(v) A ray of light travelling from water to air bends: (a) Towards the normal (b) Away from the normal (c) At 90° to the normal (d) Parallel to the normal
(vi) What happens when two unlike charges are brought close to each other? (a) They attract (b) They repel (c) They neutralize each other (d) Nothing happens
(vii) The device used to measure electric current is: (a) Voltmeter (b) Ammeter (c) Ohmmeter (d) Wattmeter
(viii) One tesla is equal to: (a) 1 T = 1 N A⁻¹ m⁻¹ (b) 1 T = 1 N A m⁻¹ (c) 1 T = 1 A⁻¹ m⁻¹ (d) 1 T = 1 N A⁻¹ m
(ix) The sky appears blue during the day due to: (a) Reflection of light (b) Scattering of shorter wavelengths (c) Absorption of blue light (d) Refraction of light
(x) A diode allows current to flow in: (a) Both directions (b) Neither direction (c) One direction only (d) Random directions
(xi) The output of a two-input NOR gate is '1', when: (a) A is '1' and B is '0' (b) A is '0' and B is '1' (c) Both A and B are '0' (d) Both A and B are '1'
(xii) Nuclear fission involves: (a) Combining light nuclei to form heavier ones (b) Splitting heavy atomic nuclei into smaller ones (c) Absorbing gamma radiation to increase stability (d) None of the above