Answer: C) Indus Explanation: The river which starts flowing from Himalayas on the North to southwards to empty in the Arabian sea is Indus River.

Answer: A) Herold Domar Model Explanation:

Answer: B) 138 Explanation: The gram formula mass of a compound is nothing but the molar mass. The molar mass of K2CO3 (Potassium Carbonate) is given by Atomic weights of individual elements are   K (Potassium) = 39 g C (Carbon) = 12 g O (Oxygen) = 16 g   Hence, that of K2CO3 = 39(2) + 12 + 16(3) = 78 + 12 + 48 = 138.

Answer: B) Rs. 11,250 Explanation: Given that SP = Rs. 12000 - 10%  = Rs. 10,800 Loss% = 4 We know that, C.P = 100/(100 - Loss%) x 100 => 100/100-4 x 10800 => 1080000/96 C.P = Rs. 11,250

An atom is the smallest particle of a substance. Chemical substances are divided into two major groups. They are 1. Pure Substances (and) 2. Mixtures.   There are two types of pure substances that are Elements and Compounds.   Elements : An element is a substance that is made up of only one kind of atoms and cannot be broken down into simpler substances by chemical means. Metals and Non- metals come under elements. Examples of elements are Iron, Silver, Gold, Mercury etc.   Compounds : A Compound is a substance that is formed when two or more elements combine chemically. Examples of compounds are Water, Carbon dioxide, methane, vinegar etc.   Mixtures : A Mixture is formed when two or more substances mixed together but not chemically combined. Example: Air.

Answer: B) Earth Explanation: Earth is not a Jovian Planet as it is a Terrestrial planet. A planet designated as Jovian is hence a gas giant, composed primarily of hydrogen and helium gas with varying degrees of heavier elements.   Within the Solar System, four Jovian planets exist – Jupiter, Saturn, Uranus, and Neptune. Though these planets vary in terms of size, mass, and composition, they all share certain characteristics that cause them to differ greatly from the terrestrial planets located in the inner Solar System.

Answer: A) Air Explanation: Light travels fastest in Vacuum. The fastest thing in the whole universe is the speed of light in a vacuum like outer space. It is about 2.99 x 108 m/s.

Answer: C) Magnesium nitrate Explanation: Mg(NO3)2 is Magnesium nitrate.   In the case of Mg(NO3)2, the metal in the compound is magnesium (Mg), and the non-metal here is called the nitrate ion (NO3). This makes the name of the compound simply magnesium nitrate.