Error and Uncertainty

Q. In a test, the average marks scored by four students is 80. If the marks scored by the 5th student is also counted, the average rises to 81. What would the marks scored by the 5th student be?

1. 81 marks
2. 84 marks
3. 85 marks
4. 90 marks

Q. Assertion :Whenever we change the unit of measurement of a quantity, its numerical value changes.
Reason: Smaller the unit of measurement, smaller is its numerical value.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Select the option that is nearest in meaning to the underlined word/words.
The experts' minute examination brought to light some important clues.

1. superficial
2. prolonged
3. quick
4. detailed

Q. The distance between the school and the house of 5 students is plotted. The average distance is 2.5 mi.

1. False
2. True

Q. If two variables x and y vary indirectly, then direction of arrow in the first column will be _.

1. Upwards
2. Downwards
3. Rightwards
4. Leftwards

Q. The reason scientists repeat measurements they take during experiments is so that they can
(a) check whether the instruments used are inaccurate.
(b) list the measurements taken in a table.
(c) take the average and reduce the possibility of an error.
(d) get more than one answer.