Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?

Related Mcqs:

1. An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?

   A. 20A B. 20.66A C. 6.66A D. 5.66A...

2. A 100µF capacitor with a 12V source in series having frequency 50Hz will offer a capacitive reactance of about______________?

   A. 32Ω B. 62Ω C. 50Ω D. 100Ω...

3. A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ?

   A. man does more work than child B. child does more work than man C. both do the same amount of work D. it is a foolish question...

4. Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?

   A. One B. Two C. Four time D. None of these...

5. Waves emitted from the antenna are__________________?

   A. Sound waves B. Electromagnetic waves C. Radio waves D. Modulated waves...

6. A 10Ω electric heater is connected to a 220V 50Hz mains supply. What is the peak value of the potential difference across the heater element ?

   A. 220V B. 220/ 2V C. 110V D. 220 √2V...

7. In vibrating cord the points where the amplitude is maximum, are called ___________________?

   A. antinodes B. nodes C. troughs D. crests...

8. Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?

   A. isothermal law B. adiabatic law C. isochoric law D. all of the above...

9. In an angular motion, Newton’s second law of motion is_____________?

   A. F=ma B. F=τp/It C. Στ = I α D. All above...

10. A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ?

    A. 1/4f B. 1/2f C. frequency lower than 20 Hz D. 2f...