Questions and answers for exam Preparation

MCQs

Total Questions : 1107 | Page 7 of 111 pages

A deposit of fine sand has a porosity 'n' and specific gravity of soil solids is G. The hydraulic gradient of the deposit to develop boiling condition of sand is given by

` i_c `= (G - 1)(1 - n)
` i_c `= (G - 1)(1 + n)
`i_c`=`(G-1)/(1 -n)`
`i_c`=`(G -1)/(1 + n)`

Discuss Question

Answer: Option A. -> ` i_c `= (G - 1)(1 - n)

Question 62.

If
in a concrete mix the fineness modulus of coarse aggregate is 7.6, the
fineness modulus of fine aggregate is 2.8 and the economical value of
the fineness modulus of combined aggregate is 6.4, then the proportion
of fine aggregate is

25%
`32 1/3`%
50%
`66 2/3`%

Discuss Question

Answer: Option B. -> `32 1/3`%

Question 63.

If the flange
angle is `beta` coefficient of friction between flange and rail is `mu`, the
derailment coefficient according to Nadal's formula should not exceed

`(tan beta - mu)/(1 - mu sqrt(cot beta))`
`(sqrt(tan beta) -mu)/(1 - mu sqrt(cot beta))`
`(tan^2 beta mu)/(1 + mu cat beta)`
`(tan beta - mu)/(1 + mu tan beta)`

Discuss Question

Answer: Option C. -> `(tan^2 beta mu)/(1 + mu cat beta)`

Question 64.

A beam of rectangular cross-section (b x d) is subjected to a torque T.
What is the maximum torsional stress induced in the beam ?(Where b < d, and `alpha`is a constant)

`(T)/(alpha b^2d)`
`(T)/(alpha bd^2)`
`(T)/(alpha bd)`
`(T)/( bd)`

Discuss Question

Answer: Option A. -> `(T)/(alpha b^2d)`

Question 65.
The deflection at the free end of a cantilever subjected to a couple M at its free end and having a uniform flexural rigidity EI throughout its length 'L' is equal to

`(ML^2)/(2EI)`
`(ML^2)/(4EI)`
`(ML^2)/(6EI)`
`(ML^2)/(8EI)`

Discuss Question

Answer: Option A. -> `(ML^2)/(2EI)`

Question 66.
If the actual observed value of standard penetration resistance, N is greater than 15 in a fine sand layer below water table, then the equivalent penetration resistance will be

`15 + ((N + 15))/(2)`
`15 - ((N + 15))/(2)`
`15 +( (N -15))/(2)`
`15 - ((N - 15))/(2)`

Discuss Question

Answer: Option C. -> `15 +( (N -15))/(2)`

Question 67.

During the measurement of a line by chain or tape in slopes, if the length of the line is 'l' and the height difference between the ends of the line is 'h', then the correction to the measured length is more than`(h^2)/(2l)` by

zero
+ `(h^4)/(8l^3)`
+ `(h^3)/(4l^2)`
- `(h^3)/(2l^3)`

Discuss Question

Answer: Option B. -> + `(h^4)/(8l^3)`

Question 68.

A shot of mass m penetrates a thickness t of a fixed plate of mass M.
If the plate were free to move and the resistance supposed to be
uniform, which one of the following is the thickness penetrated ?

`(Mt)/(M +m)`
`(mt)/(M +m)`
`(t)/(M +m)`
`(t)/(M +2m)`

Discuss Question

Answer: Option A. -> `(Mt)/(M +m)`

Question 69.

As per I.S.
1904-1986 the permissible angular distortion with respect to steel
sructures in isolated foundations resting on plastic clay is

`2/3000`
`1/300`
`1/3000`
`2/200`

Discuss Question

Answer: Option C. -> `1/3000`

Question 70.

Which one of the following represents the correct relationship between seepage pressure (p_s), unit weight of water`(gamma_omega)`and hydraulic gradient (i), inside an earth dam ?