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In inspection of castings, destructive type of testing is more reliable than the non-destructive testing.
Ultrasonic testing is destructive testing?
The depth of a sea can be determined by using SONAR. Consider the following statements about it: 1. It uses ultrasonic waves for the measurement of the depth of a sea. 2. The speed of ultrasonic waves in seawater is the same as that of sound in air. 3. Time taken by ultrasonic waves reflected from the bottom of the sea to reach the detector is used to measure the depth. Which of the above statement(s) is/are correct?
What is the normal order of activities in which traditional software testing is organized ? (a) Integration Testing (b) System Testing (c) Unit Testing (d) Validation Testing
Select the option that arranges sentences B, C, D and E in a logical sequence. Sentences A and F are static. A. Destructive comments are cutting sarcastic remarks we spew out daily. B. If people are asked to list the destructive comments made by them in the last 24 hours, they will quite often come up blank. C. Such remarks serve no other purpose than to put people down. D. This is because such comments were made without thinking so are erased from memory. E. They are meant to hurt them or assert ourselves as their superior. F. However, the objects of our scorn remember every biting comment made at their expense.
Destructive tests are generally much easier to interpret than the non-destructive tests.
Match the items of List - II with the items of List - I and select the code of correct matching List - I List - II (a) Chi-square Test (i) Testing the significance of the differences of the mean values among more than two sample groups. (b) ANOVA (F-test) (ii) Testing the goodness of fit of a distribution (c) Z - test (iii) Testing the significance of the difference of the mean values between two large sized samples (d) t - test (iv) Testing the significance of the difference of the mean values between two small sized samples when population standard deviation is not available  
Ultrasonic testing is a low sensitivity testing method.
Ultrasonic welding uses high frequency to heat up the required metals. In which of the following cases, ultrasonic welding is not used?
Consider the following with regard to ultrasonic sound waves.  I. They are used to measure the depth of the sea.  II. They are used for sterilization of a liquid.  III. They are used for removal of lamp-shoot from the chimney of factories.  Which among the above is NOT an application of the ultrasonic sound wave?