Correct Answer: B. metaphor

Correct Answer: B. l and ll only

Explanation

Based on the kinetic molecular theory of ideal gases:

• I. The cohesive forces between their particles are negligible: Correct. In an ideal gas, there are no intermolecular attractive (cohesive) or repulsive forces between the particles.

• II. They have no definite volume but occupy the volume of their containers: Correct. Gases expand freely to completely fill the volume of whatever container holds them.

• III. They are not compressible: Incorrect. Gases have large spaces between their particles, making them highly compressible.

• IV. Their particles collide with loss of energy: Incorrect. Collisions between ideal gas particles are assumed to be *perfectly elastic*, meaning there is no net loss of kinetic energy during collisions.

Therefore, only statements I and II are correct.

Correct Answer: B. I and II only

Correct Answer: A. 240Hz

Explanation

v = 120m/s, λ = 0.50m, f = ?

v = fλ

f = \(\frac{v}{λ}\) = \(\frac{120}{0.50}\)

Therefore, = 240Hz.

Correct Answer: A. spiracles of insects

Correct Answer: D. nucleus

Correct Answer: C. 128°

Explanation

x + 52^o = 90

x = 90 - 52

x = 38^o

k = opposite angle Z

k = 38^o

y + k = 90^o

y + 38^o = 90^o

y = 90^o - 38^o

y = 52^o

y = x = 180^o(sum of angles on straight line)

52 + x = 180^o

x = 180 - 52

x = 128

Correct Answer: C) root nodules

Explanation

Leguminous plants are plants that belong to the family Leguminosae. They include beans, peas, lentils, peanuts, and clover. These plants can grow in nitrogen-poor soil, thanks to their mutualistic relationship with nitrogen-fixing bacteria. Nitrogen fixation is the process by which atmospheric nitrogen is converted into a form that can be used by plants. The nitrogen-fixing bacteria live in nodules on the roots of leguminous plants. These nodules are formed from the plant's own cells in response to the presence of the bacteria. The bacteria are able to convert atmospheric nitrogen into ammonia, which is then used by the plant to make amino acids and other nitrogen-containing compounds. The correct answer to the question is option C: root nodules. The nitrogen-fixing micro-organisms live symbiotically in the root nodules of leguminous plants, not in the other options (branch roots, tap roots, or root hairs). Therefore, option C is the correct answer. Overall, nitrogen fixation is an important process for plant growth and the nitrogen cycle in general. It allows for the conversion of atmospheric nitrogen into a form that can be used by living organisms, including plants.

Correct Answer: A. a thermostat

Correct Answer: D. they are formulated by non-practising farmers

Explanation

→Muttafaq'Alaih: (Agreed upon) A hadeeth accepted by both Imam Bukhari and Imam Muslim and included in their respective Saheeh collections.

→Sahih Hadith

A sahih hadith is a hadith that has a connected chain of transmission, each narrator being upright in character, exacting, and reliable in his narration and transmission.

Ruling: There is consensus among the 'ulema that a sahih hadith is evidence for all types of rulings, such as legal rulings, and tenants of faith (with further conditions).

→Hassan Hadith

A hassan hadith is a hadith which has a connected chain of transmission, by narrators who are upright and exacting, but who's exactness is less than the exactness found in a sahih hadith, and which is free from irregularities or serious flaws.

Ruling: Like the sahih hadith, the fuqaha (jurists) and most of the muhadithun accept that the hassan hadith can also be used for evidence. For this reason, some Imams of hadith, such as al Hakim and Ibn Hibban include hassanahadith with sahih hadith, while still acknowledging its lesser rank to the sahih.

→Da'if Hadith

A da'if hadith is a hadith which does not fulfil the conditions of the sahih or hassan hadith.

Ruling: There is a difference of opinion between the 'ulema on the ruling on acting upon weak hadiths. The reliable opinion is that weak hadiths can be acted upon for virtuous supererogatory deeds (fada'il al a'mal), for religious exhortation, and stories, and similar things that are not connected to legal rulings and tenants of belief.

It should also be noted that the meaning conveyed in a weak hadith may still be considered sound and supported by other related texts.

→A gharib hadith is one conveyed by only one narrator

→Mashhur

The first category is mashhur ( meaning: famous). This refers to hadith conveyed by three or more narrators but not considered mutawatir

→Maw??

A hadith that is maw??? is one determined to be fabricated and cannot be attributed to its origin. Al-Dhahabi defines maw??? as a hadith of which the text contradicts established norms of the Prophet's sayings or of which the reporters include a liar.

→A hadith described as munqa?i? ( meaning: disconnected) is one in which the chain of people reporting the hadith (the isn?d) is disconnected at any point. The isn?d of a hadith that appears to be mutta?il but one of the reporters is known to have never heard hadith from his immediate authority, even though they lived at the same time, is munqa?i?. It is also applied when someone says "A man told me..."