Q1. Sound from an object is not audible to us. So, we can conclude that the object is not vibrating. True False Q2. Which of the following will does not allow sound propagation? Air Steel Water Vacuum Q3. A compression is a region of high frequency low frequency high pressure low pressure Q4. Gumbaz is made parabolic in shape so as To produce high amplitude sound To produce high pitch sound To produce clear sound To produce multiple echoes Q5. In echocardiography, ultrasonic waves are made to reflect from various parts of the lungs and form its image. True False Q6. Distance between a compression and its alternate rarefaction is one fourth the wavelength of the wave. True False 7. By counting the number of vibrations of a tuning fork per second ________ can be found. frequency of the wave density of the medium amplitude timbre of the sound Q8. If we increase the temperature of air from 0ºC to 22ºC then the speed of sound would ...
Q1. If mass of a body is quadrupled and velocity is made half, then the kinetic energy remains same True False Q2. Work done by a body is always negative always positive always zero negative, positive or zero Q3. A car of mass 50 kg starting from rest with a final velocity of 40 m/s travels for 20 seconds. What will be the acceleration and the work done to bring it to rest? 1.5 m/s 2 , 0.4 x 10 5 J 2.0 m/s 2 , 4.0 x 10 5 J 2.0 m/s 2 , 0.4 x 10 5 J 1.5 m/s 2 , 4.0 x 10 5 J Q4. The energy consumed by an appliance rated 1 kW in one hour is 1 kW. True False Q5. What is the unit for work done? Pascal Joule Newton Ampere Q6. In which one of the following cases is work scientifically said to be done? Mira studies for her exam Manish pulls the trolley up to a certain distance Manoj pushes the wall with no change in the position of wall Mitiksha standing at a bus stop holding a bag in her hand. ...