Q4.5 skilled workers can build a wall in 20 days; 8 semi-killed worker can build a wall in 25 days; 10 unskilled workers can build a wall in 30 days. If a team has 2 killed, 6 semi-killed and 5 unskilled workers, how long will it take to build the wall
Answer : Option DExplaination / Solution: No Explaination.
Q7.A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1Ω/m . If the line is distortion less, the attenuation constant(in Np/m) is
Answer : Option DExplaination / Solution:
For distortion less transmission line characteristics impedance
Q8.Hari(H), Gita(G), Irfan(I) and Saira(S) are sibilings (i.e. brothers and sisters). All were born on Ist January. The age difference between any two successive siblings (that is born one after another) is less than 3 years. Given the following facts:
(i) Hari’s age + Gita’s age > Irfan’s age + Saira’s age
(ii) The age difference between Gita and Saira is 1 year. However, Gita is not the oldest and Saira is not the youngest
(iii) There are not twins.
In what order were they born (oldest first)
Answer : Option BExplaination / Solution:
Let H , G, S and I be ages of Hari, Gita, Saira and Irfan respectively.
Now from statement (1) we have H + G > I + S
Form statement (2) we get that G - S = 1 or S - G = 1
As G can’t be oldest and S can’t be youngest thus either GS or SG possible.
From statement (3) we get that there are no twins
(A) HSIG : There is I between S and G which is not possible
(B) SGHI : SG order is also here and S > G > H > I andG + H > S + I which is possible.
(C) IGSH : This gives I > G and S > H and adding these both inequalities we have I + S > H + G which is not possible.
(D) IHSG : This gives I > H and S > G and adding these both inequalities we have I + S > H + G which is not possible.