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1) In a gas filled lamp, inert gases are filled in the lamp to a. Compensate heat losses b. Minimize the electricity use c. Increase the brightness d. None of these
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2) If the length of the filament is increased then the a. Power also increases b. Power decreases c. Required oxygen increases d. Flow of current increases
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3) The tube of a tube light is filled with a. Fluorescent paste b. Low pressure inert gas c. Mercury d. Only (b) and (c)
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4) Electric bell consists of a a. Horse shoe type electromagnet b. Circular electromagnet c. Rod shaped electromagnet d. All of these
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5) In cell, the current flows in outer circuit from a. Positive terminal to negative terminal and electrons from negative terminal to positive terminal b. Positive terminal to negative terminal and electrons from positive terminal to negative terminal c. Negative terminal to positive terminal and electrons from negative terminal to positive terminal d. Negative terminal to positive terminal and electrons from positive terminal to negative terminal
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6) Leclanche cell Daniel cell is an example of a. both dry cell b. both wet cell c. dry cell, wet cell d. wet cell, dry cell
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7) Secondary’s cells are a. lead acid cell b. alkaline cell c. both (a) and (b) d. none of these
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8) In voltaic cell, anode and cathode of the cell is a. copper electrode, zinc b. zinc, copper c. aluminium, zinc d. nickel, cobalt
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9) In Daniel cell, a. Layer of hydrogen bubbles is formed b. Polarization takes place c. Negative pole is a copper vessel d. None of these
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10) For controlling the initial inrush current, a. Reduced voltage is applied to the stator during the starting period b. Reduced voltage is applied to the stator when the motor is running at rated speed c. Either (a) or (b) d. None of these
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11) In India, direct - on - line starter can be used for 3 - phase squirrel cage induction motor up to the rating of a. 5 HP b. 10 HP c. 15 HP d. 25 HP
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12) Reduced voltage can be applied across the stator circuit by a. Using an autotransformer b. Connecting resistor in series with stator winding c. Connecting inductor in series with stator winding d. All of these
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13) If an induction motor is initially connected in delta and then reconnected in star then the current drawn will become a. Thrice of the current drawn when connected in delta b. Twice of the current drawn when connected in delta c. One third of the current drawn when connected in delta d. Half of the current drawn when connected in delta
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14) If an extra resistance is connected in the rotor circuit of slip ring induction motor, then a. Starting current and torque decreases b. Starting current increases and torque decreases c. Starting current decreases and torque increases d. Starting current and torque increases
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15) The atomic number of silicon and germanium is a. 32, 14 b. 12, 19 c. 14, 32 d. 19, 12
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16) To move electrons from valence band to conduction band, the energy applied to the insulator is a. Less than 15 eV b. Equal to 15 eV c. More than 15 eV d. More than 25 eV
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17) Valence electrons of silicon and germanium are a. 2, 4 b. 4, 4 c. 4, 2 d. 2, 2
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18) At low temperature, the semi conductor behaves as a a. Perfect insulator b. Perfect conductor c. Perfect consulator d. None of these
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19) If an external electric field is applied across the intrinsic semiconductor, then the a. More number of electron holes pair combination will be broken b. More number of electron holes pair combination will be evolved c. Less number of electron holes pair combination will be broken d. Less number of electron holes pair combination will be evolved
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20) According, to Kirchoff’s voltage law a. The algebraic sum of all the e.m.f’s in the circuit is zero b. Algebraic sum all the voltage drops in the circuit is zero c. Algebraic sum of e.m.f’s plus algebraic sum of voltage drops is equal to zero d. All of these
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