1
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
2
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
3
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is :
A
0.001 mm
B
0.01 cm
C
0.02 mm
D
0.001 cm
4
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The dimension of stopping potential V0 in photoelectric effect in units of Planck's constant 'h', speed of light 'c' and Gravitational constant 'G' and ampere A is :
A
h1/3 G2/3 c1/3 A–1
B
h0 c5 G-1 A-1
C
h2/3 c5/3 G1/3 A–1
D
h2 G3/2 c1/3 A–1
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