1
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
The pitch and the number of divisions, on the circular scale, for a given screw gauge are 0.5 mm and 100 respectively. When the screw gauge is fully tightened without any object, the zero of its circular scale lies 3 divisions below the mean line.

The readings of the main scale and the circular scale, for a thin sheet, are 5.5 mm and 48 respectively, the thickness of this sheet is :
A
5.755 mm
B
5.950 mm
C
5.725 mm
D
5.740 mm
2
JEE Main 2019 (Online) 9th January Morning Slot
+4
-1
A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is :
A
2.0 %
B
2.5 %
C
1.0 %
D
0.5 %
3
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
The percentage errors in quantities P, Q, R and S are 0.5%, 1%, 3% and 1.5% respectively in the measurement of a physical quantity A = $${{{P^3}{Q^2}} \over {\sqrt R S}}.$$

The maximum percentage error in the value of A will be :
A
6.0%
B
7.5%
C
8.5%
D
6.5%
4
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
The relative uncertainly in the period of a satellite orbiting around the earth is 10-2. If the relative uncertainty in the radius of the orbit is negligible, the relative uncertainty in the mass of the earth is :
A
10$$-$$2
B
2 $$\times$$ 10$$-$$2
C
3 $$\times$$ 10$$-$$2
D
6 $$\times$$ 10$$-$$2
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