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A test paper has 20 multiple-choice questions. Each correct answer is awarded 3 marks but -2 marks are given for every wrong answer. No marks are awarded or deducted for questions that are not attempted. a. Sia attempts all questions. She gets only 12 questions correct. How many marks did she score in this test? b. Rajshree scores 5 marks in a test. If she answers 7 questions correctly, find the number of questions she did not answer correctly, and also the number of questions she did not attempt.

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.

An examination consists of 10 multiple choice questions, where each question has 4 options, only one of which is correct. In every question, a candidate earns 3 marks for choosing the correct opion, and -1 for choosing a wrong option. Assume that a candidate answers all questions by choosing exactly one option for each. Then find the number of distinct combinations of anwers which can earn the candidate a score from the set {15, 16,17,18, 19, 20}.

The adjoining pie chart gives the marks scored in an examination by a student in Hindi, English, Mathematics, Social Science and Science. If the total marks obtained by the students were 540, answer the following questions.(i) In which subject did the student score 105 marks?(Hint: for 540 marks, the central angle = 360°. So, for 105 marks, what is the central angle?)(ii) How many more marks were obtained by the student in Mathematics than in Hindi?(iii) Examine whether the sum of the marks obtained in Social Science and Mathematics is more than that in Science and Hindi (Hint: Just study the central angles).

Read the given bar graph and answer the question that follow : How many marks were obtained in English?

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow Explain the process of Photosynthesis

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow What will you observe in the experimental What will you observe in the experimental

The diagram of an apparatus given below demonstrates a particular process in plants. Study the same and answer the questions that follow : What is the importance of the air bubble in the experiment ?