4 grade science games

Question: Convert 1 km/h to m/s. Answer: i.e., ..

Question: A girl claps and hears the echo after reflection from cliff which is 660 m away. If the velocity of sound is 330 m s - 1 , calculate the time taken for hearing the echo. Answer: v x t = 2 d = = 4 ..

Question: What are the different types of covalent bonds found in carbons compounds? Briefly explain with examples. Answer: There are three classes of covalent bonds, mainly found in hydrocarbons compounds of the aliphatic type: Alkanes These hydrocarbons have a single covalent bond betw..

Question: The percentage of carbon dioxide in the inhaled air is _____% and exhaled air is ____%. 1. 0 .04 and 4 2. 4 and 0.04 3. 0 .04 and 0.04 4. 4 and 4 Answer: ..

Question: Male hormone is ________________. 1. oestrogen 2. progesterone 3. adrenaline 4. testosterone Answer: 4..

Question: Indivisibility of an atom was proposed by ___________. 1. Dalton 2. Rutherford 3. Thomson 4. Bohr Answer: ..

Question: The physical quantity, which is the measure of inertia, is ________ 1. density 2. weight 3. force 4. mass Answer: 4..

Question: The force of gravitation between two bodies in the universe does not depend on 1. the distance between them 2. the product of their masses 3. the sum of their masses 4. the gravitational constant Answer: ..

Question: Which one of the following is monoatomic? 1. Oxygen 2. Hydrogen chloride gas 3. Argon 4. Ammonia Answer: ..

Question: The life supporting gases such as O 2 , CO 2 and N 2 are chiefly concentrated in the_______. 1. troposphere 2. exosphere 3. homosphere 4. stratosphere Answer: ..