Sound Question Answer discussion

A test contains 10 true/false questions. A correct answer is awarded 2 marks, a wrong answer -1 and a question not answered is awarded 0. A student attempts 7 questions and gets 8 marks. How many questions did the student answer correctly?

Pooja answered (4)/(5) of the questions given in a question paper correctly. What percentage of questions did she answer correctly?

A question paper has 20 questions, the answer to each of which is either true or false. A student scores 3 marks for every correct answer and loses 2 marks for every incorrect answer. If a student scores 25 marks, find the number of questions he answered correctly and the questions he answered incorrectly.

There are 180 multiple choice questions in a test. If a candidate gets 4 marks for every correct answer and for every unattempted or wrongly answered question one mark is deducted from the total score of correct answers. If a candidate scored 450 marks in the test, how many questions did he answer correctly?

There are 180 multiple choice questions in a test . If a candidate gets 4 marks for every correct answer and for every unattempt or wrongly answered questions 1 mark is deducted from the total score of correct answers. If a candidate scored 450 marks in test how many questions did he answer correctly

In previous question discuss the case when body move downward, upwards and remains at same position when we increases temperature.

Study the diagram given below and then answer the questions that follow : Identify the tissue and give a reason to support your answer.

Study the diagram given below and then answer the questions that follow : Identify the tooth and give a reason to support your answer.

Look at the figure and answer the questions When is the ticking sound loudest? Which law is applicable here?

State Newton's formulas for velocity of sound in air. Point out the error and hence discuss Laplace's correction.