1
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
The least count of the main scale of a screw gauge is 1 mm. The minimum number of divisions on its circular scale required to measure 5 $$\mu$$m diameter of a wire is :
A
500
B
100
C
200
D
50
2
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
If speed (V), acceleration (A) and force (F) are considered as fundamental units, the dimension of Young,s modulus will be:
A
V$$-$$2A2F2
B
V$$-$$4A$$-$$2F
C
V$$-$$4A2F
D
V$$-$$2A2F$$-$$2
3
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
The force of interaction between two atoms is given by F = $$\alpha$$$$\beta$$exp $$\left( { - {{{x^2}} \over {\alpha kt}}} \right)$$; where x is the distance, k is the Boltzmann constant and T is temperature and $$\alpha$$ and $$\beta$$ are two constants. The dimension of $$\beta$$ is :
A
M2L2T$$-$$2
B
M2LT$$-$$4
C
MLT$$-$$4
D
M0L2LT$$-$$4
4
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
The diameter and height of a cylinder are measured by a meter scale to be 12.6 $$\pm$$ 0.1 cm and 34.2 $$\pm$$ 0.1 cm, respectively. What will be the value of its volume in appropriate significant figures ?
A
4264.4 $$\pm$$ 81.0 cm3
B
4264 $$\pm$$ 81 cm3
C
4300 $$\pm$$ 80 cm3
D
4260 $$\pm$$ 80 cm3
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