41 Ultrasonic have__________________? Physics Medium Full question → A frequency in the audible range B frequency is greater than 20 kHz C frequency lower than 20 Hz D all of above
42 The velocity of sound in air would become double than its velocity at 0°C at temperature ? Physics Medium Full question → A 313°C B 586°C C 819°C D 1172°C
43 The velocity of sound is greatest in___________________? Physics Medium Full question → A Water B air C copper D ammonia
44 Velocity of sound in vacuum is ____________________? Physics Medium Full question → A 332 ms-1 B 320 ms-1 C Zero D 224 ms-1
45 According to Newton sound travel in air under the conditions of_____________________? Physics Medium Full question → A adiabatic B isothermal C isobaric D isochoric
46 A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe _____________________? Physics Medium Full question → A always an node in formed B always an antinode is formed C neither node nor antinode is formed D sometimes a node and sometimes an antinode is formed
47 In vibrating cord the points where the amplitude is maximum, are called ___________________? Physics Medium Full question → A antinodes B nodes C troughs D crests
48 The distance between any two consecutive crests or troughs is called____________________? Physics Medium Full question → A frequency B period C Wave length D phase difference
49 Waves transmit ________________ from one place to another? Physics Medium Full question → A energy B mass C both D none
50 The range of the projectile at 30 deg and 60 deg are__________________? Physics Medium Full question → A equal to 45 deg B equal to 90 deg C equal to each other D none of the above
51 The force beared by a wall on which water strikes normally at a speed of 10m/sec and at a discharge of 0.0001m3/sec is__________________? Physics Medium Full question → A 1 N B 10 N C 100 N D none
52 The trajectory (or path) of a projectile is_________________? Physics Medium Full question → A straight line B parabola C hyperbola D circle
53 The distance covered by a body in time t starting from rest is__________________? Physics Medium Full question → A at2/2 B Vt C a2t/2 D at2
54 When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________? Physics Medium Full question → A 5m/s, 1m/s B 3m/s, 3m/s C 6m/s, 1m/s D 4m/s, 2m/s
55 The thrust on the rocket in the absence of gravitational force of attraction is__________________? Physics Medium Full question → A Constant B not constant C constant if the rate of ejected gases is constant D constant for short range rocket.
56 Which of the following is not an example of projectile motion ? Physics Medium Full question → A a gas filled ballon B bullet fired from gun C a football kicked D a base ball shot
57 The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ? Physics Medium Full question → A -1 B 1 C 2 D -2
58 When collision between the bodies in a system is inelastic in nature then for system ____________________? Physics Medium Full question → A momentum changes but K.E remain conserve B K.E changes but momentum remain conserve C both momentum and K.E changes D both momentum and K.E remain conserve
59 During long jump, athlete runs before taking the jump. By doing so he__________________? Physics Medium Full question → A provide him a larger inertia B decreases his inertia C decreases his momentum D increases his momentum
60 Motorcycle safety helmet extends the time of collision hence decreasing the________________? Physics Medium Full question → A chance of collision B force acting C velocity D impulse