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Which of the following statement(s) is/are true regarding butt welding? 1. Flash butt welding is a combination of resistance, arc and pressure welding 2. Upset butt welding is used for welding rods 3. Percussion Welding is a self timing spot welding method 4. Aluminium alloys are flash welded
1500 students appeared in an examination, which consist of three papers: History, Geography and Economics. 190 students passed in History only, 180 students passed in Geography only whereas 240 students passed in Economics only. 366 students passed in both History and Economics, 346 students passed in both Economics and Geography and 326 passed in both History and Geography. 206 students passed in all the three papers. How many students passed in any two papers only?
Among 80 students, 24 passed in Chemistry, 35 passed in Physics and 29 passed in Mathematics, 8 students did not appear for the examination. If 2 students have passed in all the three subjects, 2 students have passed in Physics and Chemistry both but not in Mathematics, 2 students have passed in Chemistry and Mathematics both but not in Physics, and 8 students have passed in Physics and Mathematics both but not in Chemistry, then how many students have passed in Mathematics only?
In a class of 100 students, every student has passed in one or more of the three subjects, i.e History, Economics and English. Among all the student, 24 students have passed in English only, 14 students have passed in History only 11 students have passed in both English and Economics only, and 12 students have passed in both English and History only. A total of 50 students have passed in History. If only 5 students have passed in all three subjects, then how many students have passed in Economies only?
In a college exam, 43 passed in accounts, 42 passed in digital marketing and 40 passed in social science. In all the three exams, 10 got passing marks. 22 passed accounts and digital marketing, 23 passed in accounts and social science, 16 passed in digital marketing and social science. Find how much percentage of the students passed only in two subjects to students passed only in one subject.
Which of these statements are correct?
1. Ocean currents are the slow- surface movement of water in the ocean.
2. Ocean currents assist in maintaining the Earth's heat balance.
3. Ocean currents are set in motion primarily by prevailing winds.
4. Ocean currents are affected by the configuration of the ocean.
Ultrasonic welding uses high frequency to heat up the required metals. In which of the following cases, ultrasonic welding is not used?
There are 800 students in class X of a school. Out of them, 51% students passed in English, 48% students passed in Economic and 34% students passed in Hindi. 15% of students passed in English and Economics, 10% of students passed in English and Hindi and 13% of students passed in Economics and Hindi. Then, what is the number of students who are passed in all three subjects?
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?
Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding