1

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.

Your input ____

2

JEE Main 2021 (Online) 22th July Evening Shift

Numerical

+4

-1

Three students S

(Least count of length = 0.1 cm and Least count for time = 0.1 s)

If E

_{1}, S_{2}and S_{3}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.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 E

_{1}, E_{2}and E_{3}are the percentage errors in 'g' for students 1, 2 and 3 respectively, then the minimum percentage error is obtained by student no. ______________.Your input ____

3

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 __________.

Your input ____

4

JEE Main 2021 (Online) 16th March Morning Shift

Numerical

+4

-1

The resistance R = $${V \over I}$$, where V = (50 $$\pm$$ 2)V and I = (20 $$\pm$$ 0.2)A. The percentage error in R is 'x'%. The value of 'x' to the nearest integer is _________.

Your input ____

Questions Asked from Units & Measurements (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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