JEE Main 2017 (Online) 8th April Morning Slot | Units & Measurements Question 153 | Physics

Time (T), velocity (C) and angular momentum (h) are chosen as fundamentalquantities instead of mass, length and time. In terms of these, the dimensions of mass would be :

[M] = [T^$$-$$1 C^$$-$$2 h]

[M] = [T^$$-$$1 C² h]

[M] = [T^$$-$$1 C^$$-$$2 h^$$-$$1]

[M] = [T C^$$-$$2 h]

JEE Main 2017 (Offline)

MCQ (Single Correct Answer)

-1

The following observations were taken for determining surface tension T of water by capillary method:
diameter of capillary, D = 1.25 $$\times$$ 10^-2 m
rise of water, h = 1.45 $$\times$$ 10^-2m
Using g = 9.80 m/s² and the simplified relation T = $${{rhg} \over 2} \times {10^3}N/m$$, the possible error in surface tension is closest to :

10 %

0.15 %

1.5 %

2.4 %

JEE Main 2016 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

In the following ‘I’ refers to current and other symbols have their usual meaning. Choose the option that corresponds to the dimensions of electrical conductivity :

ML^$$-$$3 T^$$-$$3 I2

M^$$-$$1 L³ T³ I

M^$$-$$1 L^$$-$$3 T³ I²

M^$$-$$1 L^$$-$$3 T³ I

JEE Main 2016 (Offline)

MCQ (Single Correct Answer)

-1

A student measures the time period of 100 oscillations of a simple pendulum four times. The data set is 90 s, 91 s, 95 s and 92 s. If the minimum division in the measuring clock is 1 s, then the reported mean time should be :

92 $$ \pm $$ 1.8 s

92 $$ \pm $$ 3 s

92 $$ \pm $$ 2 s

92 $$ \pm $$ 5.0 s

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