PHYSICS TEST 1 Please don't use any search browser to find the answer. Just do it yourself so you can measure your knowledge power. Best of Luck! Please! Enter Password 1 / 50 If the temperature of the sink is decreased, the efficiency of Carnot engine: First increases and then decreases Increases Decreases Remains the same 2 / 50 Doppler Effect applies to Neither sound nor light wave Light wave only Both sound and light wave Sound wave only 3 / 50 The Celsius scale starts from: 0°𝐶 32°𝐹 273 𝐾 373 𝐾 4 / 50 Pull of earth on a mass of 20 kg on the surface of the earth is 196 N 1960 N 20 N 19.6 N 5 / 50 The temperature of the core of the reactor rises to about 1300oC 1100oC 1000oC 1200oC 6 / 50 Which of the following is not present in AC generator: Slip rings Armature Magnet Commutator 7 / 50 Boyle’s law holds for ideal gases in Isochoric processes Adiabatic processes Isothermal processes Isobaric processes 8 / 50 The phase difference between coils of three phase A.C is 45 90 60 120 9 / 50 The charges on the quarks are Half unit None of these One unit Fraction 10 / 50 The dimensions of stain are [M o Lo T o ] [MLT 2 ] [M -1 L-1 T -1] [ML-2 T] 11 / 50 Distance covered during one vibration of an oscillating body in term of amplitude A is: 𝐴 /2 2𝐴 𝐴 4𝐴 12 / 50 Heat is the form of: Energy Work Motion Power 13 / 50 How many times per second will an incandescent lamp reach maximum brilliance when connected to a 50Hz source? 200 times None of these 50 times 100 times 14 / 50 In which process entropy remains constant. Adiabatic Isochoric Isobaric Isothermal 15 / 50 The emf of two cells can be compared by Voltmeter AVO meter Galvanometer Potentiometer 16 / 50 When motor is at its Max. speed the back e.m.f will be Maximum None of these Zero Cannot tell 17 / 50 If a body of mass 10 kg is allowed to fall freely, its weight becomes. 98N 9.8N zero 10N 18 / 50 Voltmeter is used to measure: Resistance Temperature Potential difference Current 19 / 50 In RLC series AC circuit, when XL = XC then impedance is None Minimum Maximum Zero 20 / 50 The charge on the electron was calculated by: Faraday Millikan J.J. Thomson Einstein 21 / 50 The SI unit of coefficient of viscosity is: 𝑘𝑔 𝑚2 𝑠 𝑘𝑔 𝑚−1 𝑠−1 𝑘𝑔 𝑚−2 𝑠−1 𝑘𝑔 𝑚−2𝑠−2 22 / 50 During projectile motion, the horizontal component of velocity: Remains constant Becomes zero Increases with time Changes with time 23 / 50 Which of the following is least multiple: Femto Nano Atto Pico 24 / 50 Which of the following is similar to electron Photons 𝛽 − rays 𝛼 − rays 𝛾 – rays 25 / 50 The SI unit of plane angle is Radian Degree Steradian Candela 26 / 50 The constant K in Coulomb’s Law depends upon Nature of medium Both a & b Intensity of charge System of units 27 / 50 An accurate measurement of emf of a cell is made by All of them An ammeter A voltmeter A potentiometer 28 / 50 The oscillations in which amplitude decreased steadily with time are called: Forced oscillations Damped oscillations Natural oscillations Free oscillation 29 / 50 Lenz’s law is in accordance with the law of conservation of: Momentum Angular momentum Energy Charge 30 / 50 LASER light has the property of: Water waves Non-coherent waves Coherent waves Sound waves 31 / 50 Photon ‘A’ has twice the energy of photon ‘B’. What is the ratio of the momentum of ‘A’ to that of ‘B’? 4 : 1 1 : 2 2 : 1 None 32 / 50 An example of scalar quantity is Speed Velocity Torque Displacement 33 / 50 Types of quarks are: 10 8 6 4 34 / 50 The idea of quantization of energy was proposed by Compton Max Planck Einstein None of these 35 / 50 If a radioactive isotope of silver have a half life of about 7.5 days. After 15 days the remaining isotope of its original is 50% 7.5% 25% 15% 36 / 50 The resistance between (+) and (-) of ideal Op-Amp is High Low Infinity Moderate 37 / 50 One amu is equal to __________ 931 MeV 0.931 MeV 9.31 MeV 93.1 MeV 38 / 50 The magnitude of dot and cross product of two vectors are 6√3 and 6 respectively. The angle between them will be 45 degree 60 ° 30 ° 0° 39 / 50 Tolerance for silver band is: ±10% ±5% ±15% ±20% 40 / 50 The minimum number of unequal forces whose resultant will be zero 4 3 2 5 41 / 50 The property of a system that remains constant during an adiabatic process is called: Temperature Internal energy Pressure Entropy 42 / 50 The frequency of waves produced in microwaves oven is: 1860 MHz 1435 MHz 2850 MHz 2450 MHz 43 / 50 The critical temperature for mercury is: 3.7 K 1.18 K 4.2 K 7.2 K 44 / 50 Work done on the body equals to the Change in its P.E always Neither change in K.E nor change in its P.E Change in its K.E always Change in it K.E and change in its P.E 45 / 50 Slope of velocity time graph is Momentum Distance Acceleration Force 46 / 50 The internal energy of an ideal gas is directly proportional to: Vibrational kinetic energy Potential energy Translational kinetic energy None of these 47 / 50 The least distance of distinct vision for a normal eye is: 30 cm 40 cm 15 cm 25 cm 48 / 50 [ML-1 T -2] is the dimension of Force Energy Momentum Pressure 49 / 50 During charging of a capacitor, the ratio of instantaneous charge and maximum charge on plates of capacitors at t = RC is 30% 63.2% 36.8% 20% 50 / 50 For which position, blood pressure in the body have the smallest value? Lying horizontally Sitting on ground Sitting on chair Standing straight Your score is 0% Restart quiz
