Which of the following bolting density has been prescribed for poor types of roof?

Below mentioned are some features or cases of roof bolting. Identify one of such case where use of roof bolting may be ineffective?

A

requirement of such support which is fire-proof in nature

B

handling and transporting

C

about clearance in the roadway

D

application in highly watery face

Regarding efficiency of roof bolting some circulars were issued which of the following statement is true as per cir 5/2002 and 11/2002?

A

efficiency of bolt should be monitored regularly

B

anchorage testing machine design should be conducive to testing strength of bolts

C

results of anchorage testing machine should be analysed adequately

D

intensive training should be given to timber men

From the stress-strain diagram shown below, the tangent and the secant moduli of elasticity in GPa are
Rock Mechanics and Roof Supporting mcq question image

Rock Mechanics and Roof Supporting mcq question image

A

4.0, 2.2

B

3.3, 2.3

C

3.3, 1.5

D

4.0, 1.5

Higher pitch of the roof
i) results in stronger roof
ii) results in weaker roof
iii) requires more covering material
iv) requires less covering material
The correct answer is

A

(i) and (iii)

B

(i) and (iv)

C

(ii) and (iii)

D

(ii) and (iv)

Assertion (A): Section 5 of Limitation Act, 1963 empowers the Court to admit a suit after the prescribed period if the plaintiff satisfies the Court that he had sufficient cause for not instituting the suit.
Reason (R): Even an appeal may be admitted after the prescribed period if the appellant shows sufficient cause for not preferring the appeal within the prescribed period.

A

Both (A) and (R) are true and (R) is correct explanation of (A)

B

Both (A) and (R) are true but (R) is not correct explanation of (A)

C

(A) is true but (R) is false

D

(A) is false but (R) is true

Statements : No gentleman is poor. All gentlemen are rich.

Conclusions :
I. No poor man is rich.
II. No rich man is poor.

A

Only conclusion I follows

B

Only conclusion II follows

C

Either I or II follows

D

Neither I nor II follows

E

Both I and II follow

A large tank of height h is half-filled with a liquid of density ρ and other half-filled with a liquid of density 4ρ. A similar tank is half-filled with a liquid of density 2ρ and other-half filled with another liquid of density 3ρ as shown. What will be the ratio of the instantaneous velocities of discharge through a small opening at the base of the tanks? (assume that the diameter of the opening is negligible compared to the height of the liquid column in either of the tanks)

A

1 : 1

B

1 : 2

C

2 : 1

D

1 : 3

Determine the density specific impulse (Id) if the specific impulse is 315 s and the average density of the propellants is 840 kg/m3. Take the reference density to be the maximum density of water.

A

264.6 s

B

251.3 s

Which of the following hormone promotes bolting?

A

GA

B

Ethylene

C

Auxin

D

Kinetin

Which of the following plant hormone is most effective in induction of bolting in rosette plant?

A

Auxin

B

GA3

C

Cytokinin

D

Ethylene

Which of the following bolting density has been prescribed for poor types of roof?

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