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Which of the following is/are the applications of Sound waves? 1. It is used in the cleaning of instruments, detecting cracks in buildings, machines, ultrasound machines, and echocardiograph, SONAR. 2. In the military it is used to detect enemy aircraft. 3. In astronomy, it’s used to find the speed of moving stars and in sonography. 4. X-rays Select the correct answer using the codes given below.
In the question given below, there is a statement followed by three assumptions numbered I, II, and III. An assumption is something that is supposed or taken for granted. You have to consider the statement and assumptions and then decide which of the assumption(s) is/are implicit in the statement. You have to consider the statements to be true even if they seem to be at variance from commonly known facts. Statement: Moisturisers are mostly used in winters, as they protect the skin from scaling. Assumptions: I. Skin scaling happens mostly in winters. II. Moisturisers are beneficial only in winters. III. Moisturisers are not used in summers.
In SONAR which kind of wave is used?
Ultrasonic waves are used in sonar with greater advantage, because they:
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 of the following can be used in sonar?
What are the main instruments in a SONAR, which are used to find the distance, direction and speed of an underwater body?
Consider the following statements on streams of migration in India. Find the incorrect statement/s. I. Women mostly migrated to other states because of marriage II. Woman mostly have the streams of long-distance rural to rural migration  III. Nepal Recorded the highest number of migrants coming to India
What is the difference between asteroids and comets? 1. Asteroids are small rocky planetoids. while comets are formed of frozen gases held together by rocky and metallic material. 2. Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and Mercury. 3. Comets show a perceptible glowing tail, while asteroids do not. Which of the statements given above is/are correct?
In the following questions, four sentences are given which may or may not be grammatically correct. From the given options, choose the grammatically incorrect sentence. A. There is also a push to recruit more rangers, in order to tackle poaching. B. The Trident Underwater Drone is designed and manufactured by California-based OpenROV. C. Hibernation gets a lot most interesting in the animal kingdom. D. Humans mostly work by day; rats mostly work by night.