Correct Answer: D. Glucose

Explanation

(a) A contract is an agreement between two or more parties that is enforceable by law.

(b) Situations under which a contract can be brought to an end are:

(i) When there is an alteration of a written law affecting the contract.

(ii) When one of the parties breaches or if one of the parties refuses to carry out his own obligation in a contract.

(iii) When all the parties to the contract have carried out their obligations to the contract.

(vi) When one of the parties expresses desire not to go ahead with the contract provided such withdrawal does not constitute any loss to the other party.

(v) When the parties voluntarily agree to discontinue the contract especially when negative results are imminent

(vi) If the subject of contract is illegal, e.g prostitution or contract with a minor below the age of 18 years, the contract can be terminated except contract of necessity.

(vii) If the contract becomes frustrated by an act of God, e.g. flood, disaster, death, war, etc.

(viii) If the law discontinues the contract owing to bankruptcy.

Correct Answer: C. good

Correct Answer: C. absurdity

Correct Answer: D. 1:12

Correct Answer: c) Judge

Correct Answer: D. flexible

Correct Answer: C. the use of an ion-exchange resin

Correct Answer: A. They are formed by two identical waves travelling in opposite directions

Explanation

Let's analyze each option:

• A. They are formed by two identical waves travelling in opposite directions

This is the fundamental definition of how stationary waves (or standing waves) are created. An incident wave and a reflected wave (which is identical in frequency, wavelength, and amplitude) superpose to form a stationary wave.

This is a correct characteristic.

• B. they can be transverse or longitudinal

Stationary waves can indeed be formed from both transverse waves (like waves on a string or light waves reflecting) and longitudinal waves (like sound waves in a pipe).

This is also a correct characteristic.

• C. The distance between two successive nodes is one wavelength

The distance between two successive nodes (points of zero displacement) is actually half a wavelength (\(\lambda/2\)).

This is incorrect.

• D. The antinode is a point of minimum displacement

An antinode is a point of maximum displacement (maximum amplitude of oscillation). A node is a point of minimum (zero) displacement.

This is incorrect.

Both A and B are correct characteristics of stationary waves. However, option A describes the *origin* or *formation mechanism*, which is a very fundamental and defining aspect of what a stationary wave *is*. In many contexts, when asked for a characteristic, the formation is often highlighted.

Given that it asks Which of the following *is* a characteristic and usually implies a single best answer, let's consider which is more fundamental.

The formation (A) is what *makes* a wave stationary. The fact that they can be transverse or longitudinal (B) describes the *type* of wave that can *become* stationary.

Therefore, A is often considered the most defining characteristic regarding *how* stationary waves exist.

The final answer is A

Correct Answer: A. Minimus, Napoleon and Squealer