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Multiple Choice Questions Q1. The removal of Hydrogen from a substance is known as ---- (i) oxidation (ii) dehydration (iii) reduction (iv) crystallisation Q2. The development of unpleasant smell and taste in fat and oil containing foods due to aerial oxidation is ---- (i) acidity (ii) rancidity (iii) displacement (iv) sublimation Q3. In order to obtain a yellow precipitate from Lead Nitrate , you should mix a solution of ---- (i) Potassium Chloride (ii) Potassium Iodide (iii) Potassium Bromide (iv) Potassium Cyanide Q4. In exothermic reactions ---- (i) thermostat is required (ii) energy is released (iii) Energy is absorbed (iv) None of the above Q5. Find a & b in - (i) a = 1, b = 1 (ii) a = 1, b = 2 (iii) a = 3, b = 1 (iv) a = 2, b = 1 Q6. Which gas/gases are released when FeSO 4 is heated? (i) Sulphur Dioxide (ii) Sulphur Trioxide (iii) Both (i) & (ii) (iv) None of these Q7. Which compound is used in black and white photography? (i) Silver Chloride (ii) Sil

REFRACTION - Multiple Choice Questions  Q1. The refractive indexes of medium A, B and C are 1.8 , 1.6 and 1.7 respectively. Which of them has smallest critical angle? (i) A (ii) B (iii) C (iv) Insufficient data Q2. A convex lens has focal length of  15 cm & forming an erect image. Position of object may be at ____. (i) 10 cm (ii) 15 cm (iii) 20 cm (iv) 40 cm Q3. The refractive index of a medium is 1.2 . The speed of light in it is ____ m/s. (i) 3 × 10⁸ (ii) 2 × 10⁸ (iii) 2.5 × 10⁸ (iv) None of these Q4. If the focal length of a lens becomes half, its power becomes ____. (i) half (ii) 4 times (iii) 8 times (iv) None of these Q5. For a convex lens, the distance of image is ____. (i) positive (ii) negative (iii) both (i) & (ii) (iv) Insufficient data Q6. A small bulb is placed at the focal point of a converging lens. When the bulb is switched ON , the lens produces ____. (i) a convergent beam of light (ii) a divergent beam of light (iii) a parallel beam of light (iv) a patch

  Q1. Melting and boiling are examples of - A. adiabatic process B. isobaric process C. isothermal process D. cyclic process Q2. For an isothermal process the change in internal energy is - A. positive B. negative C. zero D. infinite Q3. Specific heat capacity of any gas for isothermal process is - A. zero B. infinite C. 1 D. log10⁵ Q4. For a cyclic process the change in internal energy is - A. positive B. negative C. Zero D. infinite Q5. Which is not an extensive variable ? A. Pressure B. mass C. volume D. internal energy Q6. First law of thermodynamics is based on - A. Law of conservation of momentum B. Law of conservation of angular momentum C. Law of conservation of mass D. None of these Q7. The slope of pressure volume curve in an adiabatic process is - A. Equal to the slope of isothermal process B. 'γ' times the slope of isothermal process C. "1/γ" times the slope of isothermal process D. Negative to the slope of isothermal process Q8. An ideal gas of volume 0.

Q1. An electron beam has an aperture of 2 mm². A total of 7 × 10¹⁵ electrons flow through any perpendicular cross-section per second. Calculate the current density of the electron beam. Q2. The charge in a given wire varies with time, given by -     q = 3t³ - t² Where, q in 'C' and t in 'secs'. Find the current flowing in the wire at 4th second. Q3. The current flowing in a conductor is the function of time, given by -    I = 8t - 3 Where, I in 'Ampere' and t in'secs'. Find the total charge flowed in first 5 seconds in the conductor. Also, find the charge which flowed from 6th to 8th second. ----------------------------------------------------------------------             ANSWERS A1. 560 Am-² A2. 136 A A3. 85 C, 106 C Introduction to CURRENT ELECTRICITY (Basic Concepts) CLICK HERE by  www.advguruji.blogspot.com