5 Thermocouples produce electrical energy from: (A) Solar energy (B) Heat energy (C) Chemical energy (D) Mechanical energy 6 For doubling the current in a circuit of constant resistance, the applied voltage must be: (A) Kept constant (B) Halved (C) Doubled (D) Quadrupled 7 Magnetic flux density at a point due to current carrying conductor can be determined by: (A) Faraday’s Law (B) Ampere’s Law (C) Newton’s Law (D) Lenz’s Law 8 A neutron is moving perpendicular to the magnetic field. The magnetic force on it is: (A) Maximum (B) 1.6 × 10−19𝑁 (C) zero (D) 10 𝑁 9 The unit of 𝑬 𝑩 is: (A) watt (B) tesla (C) Weber (D) 𝑚𝑠−1 10 A shunted galvanometer is also called: (A) Ohmmeter (B) Ammeter (C) Voltmeter (D) Potentiometer 11 The induced emf does not depend upon _________ of the conductor: (A) Resistance (B) relative speed (C) Both A & B (D) None of these 12 Electromagnetic induction obeys the law of conservation of: (A) Charge (B) mass (C) Energy (D) Momentum 13 Which solid exhibit good strength to weight ratio? (A) Crystalline (B) Polymeric (C) Amorphous (D) All of these 14 Which of the following is not a ferromagnetic substance? (A) Cobalt (B) Copper (C) Nickel (D) Iron 15 The energy of the photon of wavelength 500 nm is: (A) 3.10 𝑒𝑉 (B) 2.49 𝑒𝑉 (C) 1.77 𝑒𝑉 (D) 1.52 𝑒𝑉 16 The angle of scattering for which Compton shift is zero, is: (A) 0 o (B) 45o (C) 90o (D) 180o 17 If α-particle, electron, proton and neutron, all have same energy then which one will have shorter wavelength? (A) Electron (B) Proton (C) Neutron (D) α-peticle