IIT JEE Main 2016 Physics Question No 4

IIT JEE Main 2016 Physics Question No 4

If a, b, c, d are inputs to a gate and x is its output, then, as per the  following time graph, the gate is :

IIT JEE Main 2016 Physics Question No 4

(1) OR
(2) NAND
(3) NOT
(4) AND

Solution

As is seen from the timing graph, which is identical to that of an OR gate. In OR gate, if all the inputs are low (zero), only. Then only, the output is low (zero).

Hence, the timing graph shown is that of OR Gate.

Answer

Correct answer to given problem No 4 of IIT JEE Main Physics paper of 2016 is option (1).

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IIT JEE Main 2016 Physics Question No 3

IIT JEE Main 2016 Physics Question No 3

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

(1) 92 +/- 1.8 s
(2) 92 +/- 3 s
(3) 92 +/- 2 s
(4) 92 +/- 5.0 s

Solution

Mean value of observations i.e. time is obtained by,
Tmean = (90 + 91 + 95  + 92)/4
=> Tmean = 92s
Also absolute errors are as follows:
E1 = |92 – 90| = 2
E2 = |92 – 91| = 1
E3 = |92 – 95| = 3
E4 = |92 – 92| = 0
Therefore,  mean absolute error = (2 + 1 + 3 + 0)/4
= 1.5 s,  but since the least count of the clock is 1 second,  so it can’t count 1.5 s. Hence, it will count 2 seconds,  as an error.
(92 +/- 2) seconds is the correct option.

Correct answer to given problem No 3 of IIT JEE Main Physics paper of 2016 is option (3).

IIT JEE Main 2016 Physics Question No 2

IIT JEE Main 2016 Physics Question No 2

For a common emitter configuration, if α and β have their usual meanings, the incorrect relationship between α and β is:
(1) α = β/(1 + β)
(2) α = β2/(1+ β2)
(3) 1/α = (1/β) + 1
(4) α = β/(1 – β)

Solution

As we know that, β = α/(1 – α)
Hence, α = β/(1 + β)

Correct answer to given problem No 2 of IIT JEE Main Physics paper of 2016 is option (1).