1
JEE Main 2021 (Online) 26th August Evening Shift
Numerical
+4
-1
The acceleration due to gravity is found upto an accuracy of 4% on a planet. The energy supplied to a simple pendulum to known mass 'm' to undertake oscillations of time period T is being estimated. If time period is measured to an accuracy of 3%, the accuracy to which E is known as ..............%
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2
JEE Main 2021 (Online) 25th July Morning Shift
Numerical
+4
-1
Student A and student B used two screw gauges of equal pitch and 100 equal circular divisions to measure the radius of a given wire. The actual value of the radius of the wire is 0.322 cm. The absolute value of the difference between the final circular scale readings observed by the students A and B is ______________.
[Figure shows position of reference 'O' when jaws of screw gauge are closed]
Given pitch = 0.1 cm.

[Figure shows position of reference 'O' when jaws of screw gauge are closed]
Given pitch = 0.1 cm.

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3
JEE Main 2021 (Online) 22th July Evening Shift
Numerical
+4
-1
Three students S1, S2 and S3 perform an experiment for determining the acceleration due to gravity (g) using a simple pendulum. They use different lengths of pendulum and record time for different number of oscillations. The observations are as shown in the table.
(Least count of length = 0.1 cm and Least count for time = 0.1 s)
If E1, E2 and E3 are the percentage errors in 'g' for students 1, 2 and 3 respectively, then the minimum percentage error is obtained by student no. ______________.
Student No. |
Length of Pendulum (cm) |
No. of oscillations (n) |
Total time for n oscillations |
Time period (s) |
---|---|---|---|---|
1 | 64.0 | 8 | 128.0 | 16.0 |
2 | 64.0 | 4 | 64.0 | 16.0 |
3 | 20.0 | 4 | 36.0 | 9.0 |
(Least count of length = 0.1 cm and Least count for time = 0.1 s)
If E1, E2 and E3 are the percentage errors in 'g' for students 1, 2 and 3 respectively, then the minimum percentage error is obtained by student no. ______________.
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4
JEE Main 2021 (Online) 18th March Evening Shift
Numerical
+4
-1
The radius of a sphere is measured to be (7.50 $$\pm$$ 0.85) cm. Suppose the percentage error in its volume is x.
The value of x, to the nearest x, is __________.
The value of x, to the nearest x, is __________.
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Questions Asked from Units & Measurements (Numerical)
Number in Brackets after Paper Indicates No. of Questions
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