Effect of a force on a body depends upon

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

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

Effect of a force on a body depends upon its

A

Direction

B

Magnitude

C

Position

D

All the above

If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.

A

Change

B

Does not change

C

Changes periodically

D

None of these

A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

A

$$\frac{\tau }{2}$$

B

$$\tau $$

C

$$2\tau $$

D

$$4\tau $$

According to principle of transmissibility of forces, the effect of a force upon a body is

A

Maximum when it acts at the center of gravity of a body

B

Different at different points in its line of action

C

The same at every point in its line of action

D

Minimum when it acts at the C.G. of the body

The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

A

Same at every point on its line of action

B

Different at different points on its line of action

C

Minimum, if it acts at the center of gravity of the body

D

Maximum, if it acts at the center of gravity of the body

Economy of a multiple effect evaporator depends upon the

A

Heat balance consideration

B

Rate of heat transfer

C

Both A and B

D

Neither A nor B

Smoking tells upon our body .Here 'tell upon' means ____ .

A

benefits

B

harms

C

indicates

D

strengthens

If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,

A

P + ma = 0

B

P - ma = 0

C

P × ma = 0

D

$$\frac{{\text{P}}}{{{\text{ma}}}} = 0$$

When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

A

The value of current

B

The weight of the conductor

C

The direction of the conductor

D

None of the above

Effect of a force on a body depends upon

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