0% 0 Physics Quiz 9 1 / 50 An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________? 12 5 24 1100 2 / 50 A cyclist cycling around a circular racing track skids because_____________? the centripetal force upon him is equal to the limiting friction the friction between the tyres of the cycle and road vanishes the centripetal force upon him is greater than limiting friction the centripetal force upon him is less than limiting friction 3 / 50 The simplest type of rectification known as half wave rectification is obtained by____________________? using a transistor using a Coolidge tube suppressing half wave of A.C supply by using diode suppressing the harmonics in A.C voltage 4 / 50 A wire having very high value of conductance is said to be____________________? no specific criterion available moderately good conductor an insulator very good conductor 5 / 50 The displacement of SHM is written as X = X`sin?t if the displacement is written by X = X? sont then phase constant will be equal to_______________? 0? 180? 90? 45? 6 / 50 The maximum safe limit dose for persons working in a nuclear power station is ________________? 1 rem per week 3 rem per week 5 rem per week 4 rem per week 7 / 50 A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part _________________? becomes zero remains the same is doubled is halved 8 / 50 The highest value of escape velocity in solar system is planet____________________? Earth Jupiter Moon Neptune 9 / 50 The normal ear is the most sensitive in the frequency range___________________? 2000 to 4000 hertz 20000 to 30000 hertz 6000 to 8000 hertz 10 to 20 hertz 10 / 50 Dimension of pressure is__________________? ML-1T-1 ML-1T-2 MLT ML-2T-2 11 / 50 One pico stands for_________________? 10 raised to power -15 10 raised to power -12 10 raised to power -6 10 raised to power -9 12 / 50 The direction of propagation of an electromagnetic waves is________________? Perpendicular to both electric and magnetic field Parallel to electric and magnetic field Perpendicular to electric field Perpendicular to magnetic field 13 / 50 Rest mass of a photon is________________? very small 1.67 x 10-27 kg zero infinite 14 / 50 The number 76.85 is rounded off up to two significant figures as_____________? 77 None of these 76.8 76.9 15 / 50 Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________? magnetic flux magnetic field intensity self inductance magnetic induction 16 / 50 The ration stress to strain in youngs modulus of the material then tension is__________________? Directly proportional to square of amplitude Directly proportional to strain Directly proportional to extension Inversely proportional to extension 17 / 50 All electrical appliances are connected in parallel to each other between the main line and neutral wire to get ______________________? different current and potential differences same current and potential difference same current different current but same potential difference 18 / 50 The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is_______________? (2i^ ? 2j^ +k^)/3 (2i^ ? 2j^ +k^)/5 (2i^ ? 2j^ +k^)/9 2i^ ? 2j^ + k^ 19 / 50 Electromagnetic waves emitted from antenna are________________? All the above Transverse Stationary Longitudinal 20 / 50 The resultant of two forces of equal magnitudes is also equal to the magnitude of the forces. The angle between the two forces is________________? 30? 120? 90? 60? 21 / 50 Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property_____________? B & C A B & C A & B C & A 22 / 50 When light incident normally on thin film the path difference depends upon ________________? all thickness nature and angle of incidence nature of the film only angle of indidence only thickness of the film only 23 / 50 The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________? Net current Sinusoidal current r.m.s current Average current 24 / 50 Which one of the following has the greatest energy gap ? insulator any of above semi conductor conductor 25 / 50 In the nucleus of uranium, the number of neutrons will be _____________? 235 Different for different isotopes 143 92 26 / 50 In scientific notation, numbers are expressed in________________? Decimal Reciprocal Power of ten Powers of two 27 / 50 The centripetal acceleration produced in a rotating body is commonly due to change on_________of body? direction None of these both magnitude 28 / 50 Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe? Four time Two None of these One 29 / 50 Slope of velocity time graph is_____________________? force momentum distance acceleration 30 / 50 Gravitation force of moon is_________? 7.2 m/s? 9.8 m/s? 3.75 m/s? 1.62 m/s? 31 / 50 Unit vector n^ is along______________? X-axis Normal on a surface Y-axis Z-axis 32 / 50 Total distance travelled by a bob of the simple pendulum in one vibration is equal to________________? 2 x amplitude Amplitude Square of the amplitude 4 x amplitude 33 / 50 Pair production cannot take place in a vacuum as ________________? Momentum is not conserved Energy is not conserved The chargee is not conserved Mass is not conserved 34 / 50 Excited atoms return to their ground state in_______________? 10-9s 10-10s 10-6s 10-8s 35 / 50 Very weak magnetic fields are detected by___________________? Magnetic resonance imaging (MRI) Oscilloscope Magnetometer Squids 36 / 50 Torque acting on a body determines_______________? Linear acceleration Angular acceleration Direction of motion of the body Acceleration 37 / 50 During long jump, athlete runs before taking the jump. By doing so he__________________? increases his momentum decreases his inertia provide him a larger inertia decreases his momentum 38 / 50 Moving along the circumference of a circle completes two revolutions. If the radius of the circular path is R, the ratio of displacement to the covered path will be_______________? 2?R 4?R ?R 0 39 / 50 The distance covered by a body in time t starting from rest is__________________? at2 Vt at2/2 a2t/2 40 / 50 A convex lens of focal length f1 and a concave lens of focal length f2 are placed in contact. The focal length of the combination is_____________? f1f2/f1-f2 f2 + f1 f1f2/f2+f1 f2 ? f1 41 / 50 The area enclosed by the curve ABCDA for a Carnot heat engine represents the work done by Carnot engine_______________? averagely at any instant during one cycle during its operation 42 / 50 Which one of the following is nearly monochromatic light ? light form simple lamp light form sodium lamp light form neon lamp light form fluorescent tube 43 / 50 p-n junction when reversed biased acts as a_______________? inductor capacitor on switch off switch 44 / 50 The power of a concave lens is_______________? real positive virtual negative 45 / 50 The phase of SHM describes________________? Neither displacement nor direction of motion Both displacement and direction of motion Displacement only The direction of motion only 46 / 50 Three students measured the length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is a correct record ? Only (i) Both (i) and (ii) Only (iii) Only (ii) 47 / 50 If stretching force T of wire increases, then its frequency __________________? increases remains the same any of above decreases 48 / 50 The relation between linear and angular acceleration is______________? a = a x r a = a x r a = r x a r = a x a 49 / 50 A photon of wavelength 900nm behaves like a particle of mass______________? 5.53 x 10-36kg 0 kg. 2.46 x 10-36kg 1.84 x 10-44kg 50 / 50 The band theory of solids explains satisfactorily the nature of_________________? Electrical conductors alone All of the above Electrical semi conductors alone Electrical insulators alone Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevPhysics Quiz 8 Physics Quiz 10Next
