Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

The ultimate tensile stress of mild steel compared to ultimate compressive stress is

A

Same

B

More

C

Less

D

Unpredictable

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor and W = Axial compressive load on the spring)

A

$$\frac{{{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

B

$$\frac{{2{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

C

$$\frac{{4{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

D

$$\frac{{8{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$

The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)

A

$$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$

B

$$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$

C

$$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$

D

$$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$

For steel, the ultimate strength in shear as compared to ultimate strength in tension is

A

$$\frac{1}{2}$$

B

$$\frac{1}{3}$$

C

$$\frac{1}{4}$$

D

$$\frac{2}{3}$$

The compressive strength of cast iron is __________ that of its tensile strength.

A

Equal to

B

Less than

C

More than

D

None of these

The tensile strength of ductile materials is _________ its compressive strength.

A

Equal to

B

Less than

C

Greater than

D

None of these

ভঙ্গুর পদার্থের compressive strength, tensile strength হতে -

A

বেশি

B

কম

C

সমান

D

দ্বিগুণ

A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.

A

The student of khulna University do not usually take physical exercise.

B

No respondent took more than one form of exercise.

C

The method of data collection was not valid.

D

Some of the respondents took more than one form of exercise.

The steel used in steel cored conductors is usually

A

Alloy steel

B

Stainless steel

C

Mild steel

D

High speed steel

Stainless steel is usually made by alloying the steel with

A

Copper and nickel

B

Copper and chromium

C

Chromium and nickel

D

Manganese and copper

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

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