1
JEE Main 2017 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
[M] = [T$$-$$1 C$$-$$2 h]
B
[M] = [T$$-$$1 C2 h]
C
[M] = [T$$-$$1 C$$-$$2 h$$-$$1]
D
[M] = [T C$$-$$2 h]
2
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
10 %
B
0.15 %
C
1.5 %
D
2.4 %
3
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
ML$$-$$3 T$$-$$3 I2
B
M$$-$$1 L3 T3 I
C
M$$-$$1 L$$-$$3 T3 I2
D
M$$-$$1 L$$-$$3 T3 I
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
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 :
A
92 $$ \pm $$ 1.8 s
B
92 $$ \pm $$ 3 s
C
92 $$ \pm $$ 2 s
D
92 $$ \pm $$ 5.0 s
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