The condition for the validity under Ohm’s law is that

The condition for the validity under Ohm's law is that

A

Resistance must be uniform

B

Current should be proportional to the size of the resistance

C

Resistance must be wire wound type

D

Temperature at positive end should be more than the temperature at negative end

একটি রোধ থার্মোমিটারের সাহায্যে পানির ত্রৈধবিন্দুর রোধ 6.7 ohm এবং কক্ষ তাপমাত্রায় রোেধ 7.5 ohm পাওয়া যায়। কক্ষের তাপমাত্রা কত হবে?

A

18.2° C

B

20.8° C

C

32.6°C

D

35.9° C

According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.

A

No component is concentrated at the surface of the solution

B

The component molecules are non polar and are of almost equal size

C

In the formation of solution, chemical combination/molecular association between unlike molecules takes place

D

The attractive forces between like and unlike molecules are almost equal

Which one of the following is a direct statement of Ohm's law?

A

The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it

B

The total resistance of a parallel circuit is less than the value of the smallest resistance

C

The algebraic sum of voltages in a loop is equal to zero

D

The algebraic sum of currents entering and leaving a point is equal to zero

E

None of the above

If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as

A

non-linear conductor

B

reverse conductor

C

bad-conductor

D

non-conductor

Ohm's law is not applicable to

A

Semiconductors

B

D.C. circuits

C

Small resistors

D

High currents

Ohm’s law is not applicable to

A

vacuum tubes

B

carbon resistors

C

high voltage circuits

D

circuits with low current densities

Ohm's law describes how current is related to voltage and resistance.

A

True

B

False

Which one of the following statements regarding Ohm's law is not correct?

A

Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it

B

A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference

C

A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field

D

All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong

Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost

A

Only

B

Plus variable cost

C

Plus overhead cost

D

Plus selling expenses

The condition for the validity under Ohm’s law is that

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