1
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
The least count of the main scale of a vernier callipers is 1 mm. Its vernier scale is divided into 10 divisions and coincide with 9 divisions of the main scale. When jaws are touching each other, the 7th division of vernier scale coincides with a division of main scale and the zero of vernier scale is lying right side of the zero of main scale. When this vernier is used to measure length of a cylinder the zero of the vernier scale between 3.1 cm and 3.2 cm and 4th VSD coincides with a main scale division. The length of the cylinder is : (VSD is vernier scale division)
A
3.21 cm
B
2.99 cm
C
3.07 cm
D
3.2 cm
2
JEE Main 2020 (Online) 2nd September Morning Slot
+4
-1
If speed V, area A and force F are chosen as fundamental units, then the dimension of Young’s modulus will be
A
FA–1V0
B
FA2V–1
C
FA2V–2
D
FA2V–3
3
JEE Main 2020 (Online) 9th January Evening Slot
+4
-1
For the four sets of three measured physical quantities as given below. Which of the following options is correct ?
(i) A1 = 24.36, B1 = 0.0724, C1 = 256.2
(ii) A2 = 24.44, B2 = 16.082, C2 = 240.2
(iii) A3 = 25.2, B3 = 19.2812, C3 = 236.183
(iv) A4 = 25, B4 = 236.191, C4 = 19.5
A
A1 + B1 + C1 = A2 + B2 + C2 = A3 + B3 + C3 = A4 + B4 + C4
B
A4 + B4 + C4 $$<$$ A1 + B1 + C1 $$<$$ A3 + B3 + C3 $$<$$ A2 + B2 + C2
C
A4 + B4 + C4 $$<$$ A1 + B1 + C1 = A2 + B2 + C2 = A3 + B3 + C3
D
A4 + B4 + C4 $$>$$ A3 + B3 + C3 = A2 + B2 + C2 $$>$$ A1 + B1 + C1
4
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
A quantity f is given by $$f = \sqrt {{{h{c^5}} \over G}}$$ where c is speed of light, G universal gravitational constant and h is the Planck's constant. Dimension of f is that of :
A
Energy
B
Momentum
C
Area
D
Volume
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