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26.

A mass m supported by a massless string wound around a uniform hollow cylinder pf mass m and radius R. If the string does not slip on the cylinder, with what acceleration will the mass fall on release?

1532021281_m7.JPG


A) 2g/3

B) g/2

C) 5g/6

D) g



27.

From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle to hit the ground is n  times that taken by it to reach the highest point of its path. The relation between H, u and n is 


A) $2gH= n^{2}u^{2}$

B) $gH= (n-2)^{2}u^{2}$

C) $2gH= nu^{2}(n-2)$

D) $gH= (n-2)^{2}u^{2}$



28.

The current-voltage relation of diode is given by  $I=(e^{1000V/T}-1)mA$, where the applied voltage V is in volt and the temperature T is in kelvin. If a student makes an error measuring the current of 5 mA at 300K, What will be the error in the value of current in m A?


A) 0.2 m A

B) 0.02 m A

C) 0.5 m A

D) 0.05 m A



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