1
JEE Main 2021 (Online) 26th August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is :
A
86.4 s
B
4.32 s
C
43.2 s
D
8.64 s
2
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a Screw Gauge, fifth division of the circular scale coincides with the reference line when the ratchet is closed. There are 50 divisions on the circular scale, and the main scale moves by 0.5 mm on a complete rotation. For a particular observation the reading on the main scale is 5 mm and the 20th division of the circular scale coincides with reference line. Calculate the true reading.
A
5.00 mm
B
5.25 mm
C
5.15 mm
D
5.20 mm
3
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
If E, L, M and G denote the quantities as energy, angular momentum, mass and constant of gravitation respectively, then the dimensions of P in the formula P = EL2M$$-$$5G$$-$$2 are :
A
[M0 L1 T0]
B
[M$$-$$1 L$$-$$1 T2]
C
[M1 L1 T$$-$$2]
D
[M0 L0 T0]
4
JEE Main 2021 (Online) 27th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A physical quantity 'y' is represented by the formula $$y = {m^2}{r^{ - 4}}{g^x}{l^{ - {3 \over 2}}}$$

If the percentage errors found in y, m, r, l and g are 18, 1, 0.5, 4 and p respectively, then find the value of x and p.
A
5 and $$\pm$$2
B
4 and $$\pm$$3
C
$${{16} \over 3}$$ and $$ \pm {3 \over 2}$$
D
8 and $$\pm$$ 2
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