An electric arc is a visible plasma discharge between two electrodes that is caused by electrical current ionizing gasses in the air. Electric arcs occur in nature in the form of lightning.

Answer: D) Mukesh Father Explanation: That man's son means Mukesh => Mukesh father's son is Mukesh => It is Mukesh's father.

Answer: C) Mithali Raj Explanation: 1. Mithali Raj has been India’s premier player ever since she made her debut in 1999. 2. In the crucial game against Australia, Mithali became the woman cricketer who has scored most runs in ODIs. Mithali Raj became the first women’s player to reach 6000 ODI runs. England’s Charlotte Edwards was the previous leading run-getter in ODIs with 5992 runs. 3. She has 48 not-outs to her name, which is the most in women’s cricket.

Answer: B) OH- Explanation: A conjugate acid, is a species formed by the reception of a proton (H+) by a base—in other words, it is a base with a hydrogen ion added to it. On the other hand, a conjugate base is what is left over after an acid has donated a proton during a chemical reaction. Hence, a conjugate base is a species formed by the removal of a proton from an acid. Because some acids are capable of releasing multiple protons, the conjugate base of an acid may itself be acidic. Represented as the following chemical reaction: Acid + Base ⇌ Conjugate Base + Conjugate Acid   The water molecule is the conjugate acid of the hydroxide ion after the latter received the hydrogen proton donated by ammonium. On the other hand, ammonia is the conjugate base for the acid ammonium after ammonium has donated a hydrogen ion towards the production of the water molecule. We can also refer to OH- as a conjugate base of H2O, since the water molecule donates a proton towards the production of NH+4 in the reverse reaction, which is the predominating process in nature due to the strength of the base NH3 over the hydroxide ion.

A Clock has a face, but no eyes. It has 3 hands i.e, hours, minutes and seconds hands but no arms.

Answer: C) 949 Explanation: No. of  sweets each student get = 20% of 65 = 13 No. of sweets each teacher get = 40% of 65 = 26 No. of sweets distributed to 65 students =  13 × 65 = 845 No. of sweets distributed to 4 teachers = 4 × 26 = 104 Therefore, the total no. of sweets there = 845 + 104 = 949.

Answer: D) 89 Explanation: This can be done in a method called Approximation. Now,  52 + 63 + 6 + 72 = ? x 3.3425 + 216 + 6 + 49 = ? x 3.34296 = ? x 3.34? = 2963.34 = 88.622 ≅ 89