scott foresman science grade 4 help with science

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: Amoeba feeds with the help of _______________. 1. tentacles 2. pseudopodia 3. food vacuole 4. none of the above Answer: ..

Question: In gases, particles vibrate _________. 1. about their mean position 2. about a vertical axis 3. about a horizontal axis 4. in any direction Answer: 4..

Question: ATP stands for _____. 1. Adenosine triphosphate 2. Adenosine diphosphate 3. Advanced tactical plane 4. Adenosine terphosphorus Answer: ..

Question: The pH of a carbonated drink is ___________. 1. less than 7 2. more than 7 3. equal to 7 4. approximately 7.8 Answer: ..

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

Question: What will be the genotypic ratio of the cross between Rr and rr? 1. 1:2:1 2. 3:1 3. 1:1 4. 1:1:1 Answer: ..

Question: The non-metallic element present in the third period other than sulphur and chlorine is _______. 1. oxygen 2. fluorine 3. nitrogen 4. phosphorus Answer: 4..