Correct Answer: A. Memory unit

Explanation

The memory unit of the CPU stores instructions, data, and intermediate results. The control unit controls the operation of the CPU and hence the computer. The arithmetic section performs arithmetic operations like addition, subtraction, multiplication, and division. The logic section performs logical operations like comparison of values.

Correct Answer: B. Umar b. al Kattab

Correct Answer: B. simile

Correct Answer: C. creating conducive atmosphere for participation

Correct Answer: B) calcium trioxocarbonate (IV)

Correct Answer: C) Carbon dioxide produced in the tissues is removed by the process of osmosis

Explanation

Respiration is the process by which organisms convert food into energy that can be used for various life processes. It involves the exchange of gases, primarily oxygen and carbon dioxide. This Biology question asks which of the following statements is not correct about respiration. Option A states that gaseous exchange occurs by diffusion. This is a correct statement because during respiration, gases are exchanged between the environment and the organism's cells by diffusion, which is the movement of molecules from an area of high concentration to an area of low concentration. Option B states that oxygen combines with hemoglobin in the respiratory surface. This statement is also correct. Hemoglobin is a protein found in red blood cells that binds to oxygen and helps transport it throughout the body. Option C states that carbon dioxide produced in the tissues is removed by the process of osmosis. This statement is incorrect, and it is the answer to the question. Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane. Carbon dioxide is not a molecule of water, and therefore, it cannot be removed from tissues by osmosis. Instead, carbon dioxide is transported in the blood to the lungs, where it is removed from the body through breathing. Option D states that there are no special organs of respiration in plants. This statement is also correct. Unlike animals, plants do not have specialized organs for respiration, but they have stomata, which are tiny pores found on leaves and stems that allow for gas exchange. In summary, the correct answer to this Biology question is Option C, which states that carbon dioxide produced in the tissues is removed by the process of osmosis. This is an incorrect statement because carbon dioxide is not removed from tissues by osmosis, but it is transported in the blood to the lungs for removal through breathing.

Correct Answer: B. Umar b. Khattab

Explanation

Uthman ibn Affan, the third caliph, was chosen by a council meeting in Medina, in northwestern Arabia, in AH 23 (643/644). The second caliph, Umar ibn al-Khattab, was stabbed by Piruz Nahavandi, a Persian slave. Mindful of the tumults that had occurred after the death of Muhammad (see Succession to Muhammad), on his deathbed Umar appointed a committee of six men, to choose a new leader.

Correct Answer: C. acidic impurities

Correct Answer: D. 11.3kms^-1

Correct Answer: C. 3

Explanation

\(y = 1 - 3x + 2x^{3}\)

\(\frac{\mathrm d y}{\mathrm d x} = -3 + 6x^{2}\)

At (1, 0), \(\frac{\mathrm d y}{\mathrm d x} = -3 + 6(1^{2}) = -3 + 6 = 3\)

\(y = mx - 3 \implies \frac{\mathrm d y}{\mathrm d x} = m = 3\) (Tangent with equal gradient)