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