9.33cm
10.00cm
10.66cm
12.00cm
15.00cm
Correct answer is B
Let unstretched length = L
e1 = 14 - L and e2 = 16 - L
Using, \(\frac{m_1}{e_1}\) = \(\frac{m_2}{e_2}\)
\(\frac{20}{14 - L}\) = \(\frac{30}{16 - L}\)
L = 10cm
2 x 10-8m
2 x 10-9m
2 x 10-7m
3 x 10-9m
2.8 x 10-8m
Correct answer is B
Mass of one oil = \(\frac{5 \times 10^{-4}}{1000}\)
= 5 x 10-4kg
Density = \(\frac{\text {mass}}{\text{area x thickness}}\)
500 = \(\frac{5 \times 10^{-7}}{\text{0.5 x thickness}}\)
thickness = 2 x 10-9m
4ms-1
10ms-1
20ms-1
50ms-1
80ms-1
Correct answer is C
F = ma
= \(\frac{m(u - v)}{t}\)
16 = \(\frac{4(v - 0)}{5}\)
v = 20ms-1
Of the following derived units, the one that is not a unit of power is
joule/second
ampere volt
ampere2volt
volts2/ohm
Correct answer is C
Power = \(\frac{Work done}{time}\) = \(Js^{-1}\)
Power = \(current \times voltage\) = \(Ampere volt\)
Power = \(\frac{voltage^{2}}{resistance}\) = \(\frac{volts^{2}}{ohm}\)
0.0378 x 10 -3kg
0.227 x 10 -3kg
0.378 x 10 -3kg
0.595 x 10 -3kg
2.268 x 10 -3kg
Correct answer is E
m = Itz
= 5 x 3600 x 0.126 x 10-6
= 2.268 x 10-3kg